Adding upstream version 0.34.upstream/0.34upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

44 files changed, 12042 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..dee71c8
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,79 @@
+---
+Language:        Cpp
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: false
+AlignOperands:   false
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: false
+BinPackParameters: false
+BraceWrapping:
+  AfterClass:      true
+  AfterFunction:   true
+  AfterControlStatement: true
+  AfterEnum:       false
+  AfterNamespace:  true
+  AfterStruct:     true
+  AfterUnion:      true
+  BeforeCatch:     false
+  BeforeElse:      true
+  IndentBraces:    false
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: true
+ColumnLimit:     120
+CommentPragmas:  '^ IWYU pragma:'
+ContinuationIndentWidth: 4
+DerivePointerAlignment: false
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+IncludeCategories:
+  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority:        2
+  - Regex:           '^(<|"(gtest|isl|json)/)'
+    Priority:        3
+  - Regex:           '.*'
+    Priority:        1
+IndentCaseLabels: true
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: All
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    false
+SpaceAfterCStyleCast: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: Never
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: true
+SpacesInSquareBrackets: false
+Standard:        Cpp11
+TabWidth:        4
+UseTab:          Never
+...
diff --git a/.codespellrc b/.codespellrc
new file mode 100644
index 0000000..8aae47b
--- /dev/null
+++ b/.codespellrc
@@ -0,0 +1,2 @@
+[codespell]
+skip = ./.git
diff --git a/.github/workflows/ci_formatting.yml b/.github/workflows/ci_formatting.yml
new file mode 100644
index 0000000..e9efc06
--- /dev/null
+++ b/.github/workflows/ci_formatting.yml
@@ -0,0 +1,21 @@
+name: ci_formatting
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: updating available system dependencies
+      run: sudo apt-get update
+    - name: installing system dependencies
+      run: sudo apt-get install -y build-essential pkg-config automake libncurses5-dev autotools-dev libparted-dev dmidecode clang-format-7
+    - name: creating autoconf files
+      run: ./autogen.sh
+    - name: configuring
+      run: ./configure CFLAGS='-O0 -g -Wall -Wextra'
+    - name: verifying code style
+      run: make check-format
diff --git a/.github/workflows/ci_ubuntu_18.04.yml b/.github/workflows/ci_ubuntu_18.04.yml
new file mode 100644
index 0000000..5215dd2
--- /dev/null
+++ b/.github/workflows/ci_ubuntu_18.04.yml
@@ -0,0 +1,21 @@
+name: ci_ubuntu_18.04
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: updating available system dependencies
+      run: sudo apt-get update
+    - name: installing system dependencies
+      run: sudo apt-get install -y build-essential pkg-config automake libncurses5-dev autotools-dev libparted-dev dmidecode
+    - name: creating autoconf files
+      run: ./autogen.sh
+    - name: configuring
+      run: ./configure CFLAGS='-O0 -g -Wall -Wextra'
+    - name: compiling
+      run: make
diff --git a/.github/workflows/ci_ubuntu_latest.yml b/.github/workflows/ci_ubuntu_latest.yml
new file mode 100644
index 0000000..7da1d70
--- /dev/null
+++ b/.github/workflows/ci_ubuntu_latest.yml
@@ -0,0 +1,21 @@
+name: ci_ubuntu_latest
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: updating available system dependencies
+      run: sudo apt-get update
+    - name: installing system dependencies
+      run: sudo apt-get install -y build-essential pkg-config automake libncurses5-dev autotools-dev libparted-dev dmidecode
+    - name: creating autoconf files
+      run: ./autogen.sh
+    - name: configuring
+      run: ./configure CFLAGS='-O0 -g -Wall -Wextra'
+    - name: compiling
+      run: make
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7c440c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,22 @@
+Makefile
+Makefile.in
+aclocal.m4
+autom4te.cache/
+compile
+config.h
+config.h.in
+config.log
+config.status
+configure
+depcomp
+install-sh
+man/Makefile
+man/Makefile.in
+missing
+src/**/.deps/
+src/**/.dirstamp
+*.o
+src/Makefile
+src/Makefile.in
+src/nwipe
+stamp-h1
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..ae98839
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,258 @@
+RELEASE NOTES
+=============
+
+v0.33
+-----------------------
+- Fixes a slight screen corruption on 80 column display. When highlighting the verify ones option the first two digits of DoD 5220.20-M disappear. This patch fixes that issue.@PartialVolume #348 
+- For some controllers/drivers the readlink method of obtaining the bus type for GUI display does not work. If we haven't already resolved the bus type, we then also check smartctl for the transport protocol for SAS. @PartialVolume #350 
+- Check smartctl for unresolved bus types SATA  @PartialVolume #358 
+- Changed message from (No ATA pass-thru) to (S/N: unknown) as the reason the serial number is unknown is because there is no ATA pass through for the chipset being used by the USB to SATA adapter, basically we are making the message more meaningful for the end user rather than for the engineer/programmer that may understand the previous terminology used. @PartialVolume @Firminator #356 
+- Add drive temperature monitoring and display temperature in degrees Celsius in the GUI. Requires the kernel drivetemp module and makes use of the hwmon sub system in the kernel to extract drive temperatures. Nwipe will automatically load the drivetemp module if it's available. @PartialVolume #360 #361 #364
+- Remove /dev/ from gui for long device names. This fixes column alignment issues in the gui with nvme drives i.e. nvme0n1 etc. If the drive name including path exceeds 8 characters the /dev/ is removed and prefixed with spaces to a total max length of 8 characters. @PartialVolume #365 
+- Add -q --quiet option - anonymize serial numbers and SMBIOS-DMI data. This anonymizes serial numbers and related identifiable information for drives and hardware but does not remove model information in both the GUI and the log displayed by stdout at the end of a wipe and also in the log file if enabled in options. This feature is useful for uploading logs when submitting bug reports. @PartialVolume #366 #367 #371 #379 #383 
+- Fixes a intermittent FAILED message that is displayed in the summary table when the message should have been UABORTED. The incorrect FAILED message only occurred when using control-C to abort a wipe. @PartialVolume #373 
+- When many verification or pass errors are detected the status line can wrap on a 80 column display. This patch makes the error message more succinct which will free up about 10 characters & prevents the line wrapping. @PartialVolume #374 
+- Fixes a problem that occurs with a unresponsive drive that causes the ETA to grow to an enormous value. We now do not calculate an individual drives ETA  when the throughput of the drive is zero so avoiding the overall ETA being incorrect for drives that are working correctly when multiple drives are being simultaneously wiped. While a individual drives ETA is calculated it is not displayed but only used to determine the overall ETA when all drives have completed. @PartialVolume #375 
+- Add temperature monitoring and display with NVMe drives. @PartialVolume #377 #380 #381 
+- When one of the two verify only methods are selected change the drive selected text from WIPE to VRFY to indicate the drive is not being wiped, but is only being verified. @PartialVolume  #378 
+- Fixes a incorrect sector, block and device sizes in 32 bit builds only as displayed in the nwipe log. This problem had no affect on the wipe as the issue was caused by a incorrect format specifier that affected the log text only. @PartialVolume #387 #388 
+- Fixes a issue where temperatures may not have been available on Debian systems due to the location of modprobe. Particularly relevant to Debian which when logged in as root doesn't put /sbin in the $PATH environment setting. This issue was not necessarily relevant for Linux distros based on Debian, for instance, Ubuntu where nwipe would have found the modprobe command. @PartialVolume #390 #391 
+- Improve wipe thread cancellation error checking. @PartialVolume #392 
+- Improve GUI thread messaging if a pthread_join fails. @PartialVolume #393 
+- Fixed a missing serial number on SAS drive.@PartialVolume  #394 
+- Added ISAAC-64 for 64 bit systems. Thanks @chkboom #398 #401 
+- Fixes a problem with the Gutmann wipe where the random passes at the beginning and end were being re-arranged when only the inner passes should be rearranged. Thanks @chkboom #399
+- Fixes a obscure incorrect summary table status, while the log text correctly reports the failure. If the drive becomes non responsive during the wipe, the MB/s throughput will slowly drop towards 0MB/s and will display a FAILURE -1 error. The logs will correctly display errors and nwipe's return status will be non zero, however the summary table may display erased rather than FAILURE, this is because
+the wipe thread exited prematurely without setting the pass error. This fixes the error by checking the context's result status, i.e non zero on failure and if pass equals zero it makes pass equal to one. This is then picked up by the summary table log code which then marks the status
+correctly as FAILURE in the summary table. @PartialVolume #400 
+- Fixes a spurious message on abort before wipe.This patch fixes a minor display issue that occurs when a user aborts a wipe before a wipe has started. It only occurs if the user had selected one or more drives for wipe and then aborted before starting the wipe. The spurious message only occurs in a virtual terminal, i.e. /dev/tty1, /dev/tty2, /dev/console It does not occur in terminal applications such as konsole, xterm, terminator etc. The spurious message that appears in the main window, states that "/dev/sdxyz 100% complete" along with garbage values in the statistics window. The message appears for a fraction of a second before being replaced with the textual log information that correctly states that the user aborted and no wipe was started. Basically the gui status information update function tries to update the data when the wipe hasn't even started. The fix is to only update the statistics information only if a wipe has started by checking the 'global_wipe_status' value which indicates whether any wipe started. '1' indicates that a wipe has started, else '0' if no wipe has started. @PartialVolume #406 
+- Fixes temperature update in drive selection window. This fixes a problem where the drive temperature is not updated
+automatically in only the drive selection window. The temperature is however updated correctly every 60 seconds during a wipe in the wipe status window. This bug would probably never be noticed by most people as usually the drive temperature changes slowly and only rises once a wipe has started. The only time I imagine it would have been noticed would have been if the drive temperature was already high and you were trying to reduce the temperature by cooling before starting a wipe. This has now been corrected so that the temperature in the drive
+selection window is updated every 60 seconds. @PartialVolume #407 
+- Fixes a zombie nwipe process running at 100% CPU on one core but only on a Konsole based terminal. This only occurred when the Konsole terminal is exited while nwipe is sitting at the drive selection screen but nwipe did not exit when the konsole terminal was closed. If nwipe is exited normally on completion of a wipe or aborted by using control C then this problem would not be seen. Also occurs during a wipe if the konsole terminal is closed without exiting nwipe first, again only on Konsole based terminals. @PartialVolume #408 #409 
+- Fixes a obscure segfault when --logfile option used with a non writable directory. @PartialVolume #410 
+
+
+v0.32
+-----------------------
+- Add ones (0xFF) wipe to the methods. Renamed Zero Fill to Fill with Zeros and the new ones wipe, is called Fill with Ones.
+- Add ones verication to the methods. Renamed Verify Blank to Verify Zeros (0x00) and the new verification is called Verify Ones (0xFF).
+- Move method information from below the list of methods to the right of the method list. This allows better use of the screen space by allowing more methods to be added to the list, especially relevant to nwipe running as a standalone application on small distros such as shredos 2020 in frame buffer mode.
+- Removed the old DBAN syslinux.cfg configuration hints as not relevant to nwipe. See nwipe --help or man nwipe for command line options.
+- Add fdatasync errors to the error summary table.
+- During a wipe, you can now toggle between dark screen, blank screen and default blue screen by repeatedly pressing the b key. Dark screen, which is grey text on black background has been introduced to prevent TFT/LCD image persistence on monitors that are sensitive to that issue.
+
+v0.31
+-----------------------
+- Blanking disabled in GUI for OPS2 (mandatory requirement of standard). [#326](https://github.com/martijnvanbrummelen/nwipe/pull/326)
+- Total bytes written/read for ALL passes or verifications are now logged. [#326](https://github.com/martijnvanbrummelen/nwipe/pull/326)
+- Final blanking being enabled is no longer required for verification passes. GUI Fix. [#326](https://github.com/martijnvanbrummelen/nwipe/pull/326)
+- Add a summary table to the log that shows totals for pass & verification errors. [#325](https://github.com/martijnvanbrummelen/nwipe/pull/325)
+- Fix the missing 'Verifying' message on final blanking. [#324](https://github.com/martijnvanbrummelen/nwipe/pull/324)
+- Fix prng selection always using mersenne irrespective of whatever prng the user selected. [#323](https://github.com/martijnvanbrummelen/nwipe/pull/323)
+- Fix a non functional Isaac prng. (May have never worked even in DBAN/dwipe 2.3.0). [#322](https://github.com/martijnvanbrummelen/nwipe/pull/322)
+- Log whether the prng produces a stream, if not log failure message. [#321](https://github.com/martijnvanbrummelen/nwipe/pull/321)
+- Log the specific prng that is initialised. [#320](https://github.com/martijnvanbrummelen/nwipe/pull/320)
+- Log selection details to the log. [#319](https://github.com/martijnvanbrummelen/nwipe/pull/319)
+- Improve log messaging. [#317](https://github.com/martijnvanbrummelen/nwipe/pull/317)
+- Fix auto shutdown option for some distros. [#315](https://github.com/martijnvanbrummelen/nwipe/pull/315)
+- Fix build for musl. [#301](https://github.com/martijnvanbrummelen/nwipe/pull/301)
+- Fixes to summary table & fix final status message. [311](https://github.com/martijnvanbrummelen/nwipe/pull/311/commits/12063ad9549860cd625cb91d047bd304217a9ebf)
+- Updates to --help options [#309](https://github.com/martijnvanbrummelen/nwipe/pull/309/commits/69c9d7d6c5a091c58b3e747078d0022ccdd95a99)
+- Updates to manpage. [#300](https://github.com/martijnvanbrummelen/nwipe/commit/7cc1a68a89236c4b501dde9149be82c208defccd)
+
+v0.30
+-----------------------
+- Add auto power off option on completion of wipe ( --autopoweroff ) (Thanks PartialVolume)
+- Fixed --nowait option that wasn't working. (Thanks PartialVolume)
+- Add verbose option. -v, --verbose.
+- Add a spinner to the GUI for each drive being wiped. When nwipe is syncing the percentage completion pauses, having a spinner gives a clear indication that the wipe is still running. Each devices spinner disappears on completion of a given devices wipe. (Thanks PartialVolume)
+- Make log messages, especially the ones with the tag 'notice' succinct and less than 80 characters including the timestamp. This is of more importance when nwipe is used on a 80x30 terminal (ALT-F2, Shredos etc) but generally makes the logs more readable. While doing this all information was still retained. (Thanks PartialVolume)
+- Add a summary table to the log that shows each drives status, i.e. erased or failed, throughput, duration of wipe, model, serial no etc. In particular it benefits those that wipe many drives simultaneously in rack servers. At a glance any failed drives can be seen without having to browse back through the log. (Thanks PartialVolume)
+- Add ETA to --nogui wipes status when SIGUSR1 (kill -s USR1 (nwipes PID) is issued on the command line.
+- Fixed misleading throughput calculation. Throughput now shows average throughput calculated from start of wipe.
+- Fixed system info not being displayed in Debian Sid. [#229](https://github.com/martijnvanbrummelen/nwipe/issues/229) (Thanks PartialVolume)
+- Add serial number display for USB to IDE/SATA adapters. This only works if the USB to IDE/SATA adapter supports ATA pass through. See [#149](https://github.com/martijnvanbrummelen/nwipe/issues/149) for further details (Thanks PartialVolume)
+- Fixed disk capacity nomenclature, width and padding on drive selection screen. See [#237](https://github.com/martijnvanbrummelen/nwipe/issues/237) (Thanks PartialVolume)
+- Add bus type, ATA or USB, amongst others to drive selection and wipe windows. (Thanks PartialVolume)
+- Add --nousb option. If you use the option --nousb, all USB devices will be ignored. They won't show up in the GUI and they won't be wiped if you use the --nogui --autonuke command. They will even be ignored if you specifically name them on the command line.
+- Miscellaneous GUI fixes, throughput display format, percentage display format to improve column alignment when wiping multiple discs. (Thanks PartialVolume)
+- Improve visibility of failure messages with red text on white background. (Thanks PartialVolume)
+- Add NVME and VIRT (loop etc) devices to device type table for display in GUI and logs. NVME devices now show up as NVME devices rather than UNK (Thanks PartialVolume)
+- Fixed very obscure segmentation fault going back to at least 0.24 in drive selection window when resizing terminal vertical axis while drive focus symbol '>' is pointing to the last drive of a multi drive selection window. See [#248](https://github.com/martijnvanbrummelen/nwipe/pull/248) for further details (Thanks PartialVolume)
+- Warn the user if they are incorrectly typing a lower case s to start a wipe, when they should be typing a capital S [#262](https://github.com/martijnvanbrummelen/nwipe/issues/262) (Thanks PartialVolume)
+- Warn the user if they are typing capital S in order to start a wipe but haven't yet selected any drives for wiping [#261](https://github.com/martijnvanbrummelen/nwipe/issues/261) (Thanks PartialVolume)
+- Add ctrl A that toggles drive selection, all drives selected for wipe or all drives deselected. [#266](https://github.com/martijnvanbrummelen/nwipe/issues/266)
+- Fixed compilation issue with NixOS with broken musl libc error due to missing header [#275](https://github.com/martijnvanbrummelen/nwipe/issues/275)
+- Fixed status bar message showing incorrect information [#287](https://github.com/martijnvanbrummelen/nwipe/issues/287)
+- Right Justify log labels to maintain column alignment [#280](https://github.com/martijnvanbrummelen/nwipe/issues/280)
+- Added nwipe version & OS info to log [#297](https://github.com/martijnvanbrummelen/nwipe/pull/297)
+
+v0.28
+-----------------------
+- Fixed premature exit when terminal resized on completion of wipes (Thanks PartialVolume)
+- Fixed GUI when terminal is resized, currently not handled correctly causing missing or incorrectly sized ncurses windows/panels (Thanks PartialVolume)
+- Fixed GUI screen flicker under various situations. [#200](https://github.com/martijnvanbrummelen/nwipe/pull/200) Fixes [#115](https://github.com/martijnvanbrummelen/nwipe/issues/115) (Thanks PartialVolume)
+- Fixed responsivness of screen during wipe when resized. Info is updated every 10th/sec. Key presses are more responsive. (Thanks PartialVolume)
+- Fixed compiler warning regarding buffer overflow. Fixes [#202](https://github.com/martijnvanbrummelen/nwipe/issues/202) (Thanks PartialVolume)
+- Fixed Man page (Thanks martijnvanbrummelen)
+- Fixed individual device throughput. On completion of a wipe instead of the throughput calculation stopping for a completed wipe, it would continue to calculate resulting in a particular drives throughtput slowly dropping until eventually it reached zero. The overall throughput was not affected. (Thanks PartialVolume)
+
+v0.27
+-----------------------
+- Add `verify` method to verify a disk is zero filled [#128](https://github.com/martijnvanbrummelen/nwipe/pull/128) (Thanks Legogizmo)
+- Add new HMG IS5 enhanced wipe method [#168](https://github.com/martijnvanbrummelen/nwipe/pull/168) (Thanks infrastation)
+- Fixed percentage progress and show on completion of wipe (Thanks PartialVolume)
+- Implement clang-format support (Thanks louib)
+- Implement more frequent disk sync support (Thanks Legogizmo)
+- Format command line help to 80 character line length [#114](https://github.com/martijnvanbrummelen/nwipe/pull/114) (Thanks PartialVolume)
+- Fixed nwipe message log and missing messages that was causing segfaults under certain conditions (Thanks PartialVolume)
+- Add the Github build CI service and update Readme with build status labels (Thanks louib)
+- Miscellaneous smaller fixes
+
+
+v0.26
+-----
+- Add exclude drive option (Thanks PartialVolume)
+- Log hardware (Thanks PartialVolume)
+
+v0.25
+-----
+- Correct J=Up K=Down in footer (Thanks PartialVolume)
+- Fixed segfault initialize `nwipe_gui_thread` (Thanks PartialVolume)
+- Fixed memory leaks (Thanks PartialVolume)
+- Check right pointer (Thanks PartialVolume)
+- Fixed casting problem (Thanks PartialVolume)
+- Fixed serial number
+- Fixed uninitialized variable warning (Thanks PartialVolume)
+
+v0.24
+-----
+- use include values for version 0.17
+- display throughput value more friendly (Thanks Kelderek)
+
+v0.23
+-----
+- make serial visible again on 32Bit machines
+
+v0.22
+-----
+- Update manpage
+- use long long for device size
+- Use `ped_unit_format_byte` function to display(friendly) size of device
+
+v0.21
+-----
+- Fixed ETA not updating properly and bad total throughput display. (Thanks Niels Bassler).
+
+v0.20
+-----
+- Fixed build when panel header is not in `/usr/include` (Thanks Vincent Untz).
+
+v0.19
+-----
+- Fixed building on Fedora(Unknown `off64_t`) bug #19.
+- Use PRNG instead of zero's bug #7. (Thanks xambroz).
+
+v0.18
+-----
+- Fixed grammar.
+- Move from `loff_t` to `off64_t` for musl libc support.
+- Add `--nosignals` option.
+- Automake needs the `dist_` prefix to include man pages in `make dist`.
+- Remove more compiler warnings.
+- Add libintl, libuuid dependencies to allow parted static link
+
+v0.17
+-----
+- Remove control reaches end of non-void function" warnings (Thanks Vincent Untz).
+- Remove unused variables (Thanks Vincent Untz).
+- Change start key to 'S' instead of F10 (closes debian bug #755474).
+- Fixed problem with unusable device (Closes debian bug #755473).
+
+v0.16
+-----
+- Fixed problems building with clang compiler (Thanks Martijn van Brummelen)
+
+v0.15
+-----
+- Add more detailed information to status page when wiping
+- Add ability to send SIGUSR1 to print wiping current status to log
+- Fixed problem with status bar disappearing on narrow windows (Github issue #1)
+
+v0.14
+-----
+- Added explicit check for ncurses (required for Fedora). See bug 3604008.
+
+v0.13
+-----
+- Added nowait option (patch 3601259 - thanks David Shaw).
+- Added nogui option.
+- Updated man page and help command for above options and autonuke.
+- Added pkg-config check for ncurses (patch 3603140 - thanks Alon Bar-Lev).
+
+v0.12
+-----
+- Added ability to specify device on command line (patch 3587144).
+- Fixed segfault for -p option (patch 3587132).
+
+v0.11
+-----
+- Fixed bug 3568750. Not closing devices after initial scan.
+
+v0.10
+-----
+- Fixed bug 3553851. Not exiting on terminal kill. Fixed for all areas of
+  program including wiping.
+
+v0.09
+-----
+- Added feature #3545971. Display device name.
+- Added feature #3496858. Option to not perform a final blanking pass.
+
+v0.08
+-----
+- Fixed bug #3501746 whereby "wipe finished" was displayed too early
+
+v0.07
+-----
+- Added threading synchronisation for logging
+- Fixed bug #3486927 (incorrect Sourceforge URL)
+
+v0.06
+-----
+- Added man page (thanks Michal Ambroz <rebus@seznam.cz>)
+- Updated GPL licence and FSF address (thanks Michal Ambroz <rebus@seznam.cz>)
+
+v0.05
+-----
+- Added sequence number to disk selection
+- Added check for ncurses header files in subdir
+- Fixed screen corruption bug introduced in 0.04
+- Fixed occasional seg fault on start
+- Introduced dynamic array allocation for devices, with no hard limit
+- Minor updates to configure.ac
+
+v0.04
+-----
+- Removed references to DBAN in options.c
+- Added log file name option (-l|--logfile)
+- If no log file specified all messages go to STDOUT
+- Incorrect success message after an interruption fixed
+- Improved labelling of disks with no partition table
+- Added help command
+- Added version command
+- Added command 'b' to blank screen during wipe
+- Compilation needs to include panel library
+
+KNOWN BUG - display sometimes becomes corrupted after starting wipe
+
+v0.03
+-----
+- Added quit option label (ctrl-c)
+- Removed further references to DWIPE
+- Added GPL V2 licence file (COPYING)
+
+v0.02
+-----
+- Fixed segfault that happened during multiple disk wipes
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
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+                     END OF TERMS AND CONDITIONS
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+            How to Apply These Terms to Your New Programs
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+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
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+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
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+    This program is free software; you can redistribute it and/or modify
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+    (at your option) any later version.
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+    This program is distributed in the hope that it will be useful,
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+    You should have received a copy of the GNU General Public License along
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+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
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+    Gnomovision version 69, Copyright (C) year name of author
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+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
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+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
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+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
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+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..0df77f5
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,9 @@
+SUBDIRS = src man
+
+# The set of files to be formatted.
+FORMATSOURCES = src/*.c src/*.h
+format:
+	clang-format -i -style=file $(FORMATSOURCES)
+
+check-format:
+	clang-format -i -style=file $(FORMATSOURCES) && git diff --exit-code
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5379018
--- /dev/null
+++ b/README.md
@@ -0,0 +1,208 @@
+# nwipe
+![GitHub CI badge](https://github.com/martijnvanbrummelen/nwipe/workflows/ci_ubuntu_latest/badge.svg)
+![GitHub CI badge](https://github.com/martijnvanbrummelen/nwipe/workflows/ci_ubuntu_16.04/badge.svg)
+[![GitHub release](https://img.shields.io/github/release/martijnvanbrummelen/nwipe)](https://github.com/martijnvanbrummelen/nwipe/releases/)
+
+nwipe is a fork of the dwipe command originally used by Darik's Boot and Nuke (DBAN). nwipe was created out of a need to run the DBAN dwipe command outside of DBAN, in order to allow its use with any host distribution, thus giving better hardware support.
+
+nwipe is a program that will securely erase the entire contents of disks. It can wipe a single drive or multiple disks simultaneously. It can operate as both a command line tool without a GUI or with a ncurses GUI as shown in the example below:
+
+> **Warning**
+>  Nwipe does not currently support HDA (hidden disc area) detection. You will need to run hdparm to detect and if necessary correct the reported size of the disc prior to using nwipe.
+
+![Example wipe](/images/example_wipe.gif)
+
+<i>GIF showing six drives being simultaneously erased. It skips to the completion of all six wipes and shows five drives that were successfully erased and one drive that failed due to an I/O error. The drive that failed would then normally be physically destroyed. The five drives that were successfully wiped with zero errors or failures can then be redeployed.</i>
+
+The user can select from a variety of recognised secure erase methods which include:
+
+* Fill With Zeros    - Fills the device with zeros (0x00), one round only.
+* Fill With Ones     - Fills the device with ones  (0xFF), one round only.
+* RCMP TSSIT OPS-II  - Royal Candian Mounted Police Technical Security Standard, OPS-II
+* DoD Short          - The American Department of Defense 5220.22-M short 3 pass wipe (passes 1, 2 & 7).
+* DoD 5220.22M       - The American Department of Defense 5220.22-M full 7 pass wipe.
+* Gutmann Wipe       - Peter Gutmann's method (Secure Deletion of Data from Magnetic and Solid-State Memory).
+* PRNG Stream        - Fills the device with a stream from the PRNG.
+* Verify Zeros       - This method only reads the device and checks that it is filled with zeros (0x00).
+* Verify Ones        - This method only reads the device and checks that it is filled with ones (0xFF).
+* HMG IS5 enhanced   - Secure Sanitisation of Protectively Marked Information or Sensitive Information
+
+nwipe also includes the following pseudo random number generators:
+* Mersenne Twister
+* ISAAC
+
+These can be used to overwrite a drive with a stream of randomly generated characters.
+
+nwipe can be found in many [Linux distro repositories](#which-linux-distro-uses-the-latest-nwipe).
+
+nwipe is also included in [ShredOS](https://github.com/PartialVolume/shredos.x86_64) which was developed in particular to showcase nwipe as a fast-to-boot standalone method similar to DBAN. ShredOS always contains the latest nwipe version.
+
+## Compiling & Installing
+
+For a development setup, see the [Hacking section](#hacking) below. For a bootable version of the very latest nwipe master that you can write to an USB flash drive or CD/DVD, see the [Quick and easy bootable version of nwipe master section](#quick--easy-usb-bootable-version-of-nwipe-master-for-x86_64-systems) below.
+
+`nwipe` requires the following libraries to be installed:
+
+* ncurses
+* pthreads
+* parted
+
+and optionally, but recommended, the following programs:
+
+* dmidecode
+* readlink
+* smartmontools
+
+### Debian & Ubuntu prerequisites
+
+If you are compiling `nwipe` from source, the following libraries will need to be installed first:
+
+```bash
+sudo apt install \
+  build-essential \
+  pkg-config \
+  automake \
+  libncurses5-dev \
+  autotools-dev \
+  libparted-dev \
+  dmidecode \
+  coreutils \
+  smartmontools
+```
+
+### Fedora prerequisites
+
+```bash
+sudo bash
+dnf update
+dnf groupinstall "Development Tools"
+dnf groupinstall "C Development Tools and Libraries"
+yum install ncurses-devel
+yum install parted-devel
+yum install dmidecode
+yum install coreutils
+yum install smartmontools
+```
+Note. The following programs are optionally installed although recommended. 1. dmidecode 2. readlink 3. smartmontools.
+
+#### dmidecode
+dmidecode provides SMBIOS/DMI host data to stdout or the log file. If you don't install it you won't see the SMBIOS/DMI host data at the beginning of nwipes log.
+
+#### coreutils (provides readlink)
+readlink determines the bus type, i.e. ATA, USB etc. Without it the --nousb option won't work and bus type information will be missing from nwipes selection and wipe windows. The coreutils package is often automatically installed as default in most if not all distros.
+
+#### smartmontools
+smartmontools obtains serial number information for supported USB to IDE/SATA adapters. Without it, drives plugged into USB ports will not show serial number information.
+
+If you want a quick and easy way to keep your copy of nwipe running the latest master release of nwipe see the [automating the download and compilation](#automating-the-download-and-compilation-process-for-debian-based-distros) section.
+
+### Compilation
+
+First create all the autoconf files:
+```
+./autogen.sh
+```
+
+Then compile & install using the following standard commands:
+```
+./configure
+make format (only required if submitting pull requests)
+make
+make install
+```
+
+Then run nwipe !
+```
+cd src
+sudo ./nwipe
+```
+or
+```
+sudo nwipe
+```
+
+### Hacking
+
+If you wish to submit pull requests to this code we would prefer you enable all warnings when compiling.
+This can be done using the following compile commands:
+
+```
+./configure --prefix=/usr CFLAGS='-O0 -g -Wall -Wextra'
+make format (necessary if submitting pull requests)
+make
+make install
+```
+
+The `-O0 -g` flags disable optimisations. This is required if you're debugging with `gdb` in an IDE such as Kdevelop. With these optimisations enabled you won't be able to see the values of many variables in nwipe, not to mention the IDE won't step through the code properly.
+
+The `-Wall` and `-Wextra` flags enable all compiler warnings. Please submit code with zero warnings.
+
+Also make sure that your changes are consistent with the coding style defined in the `.clang-format` file, using:
+```
+make format
+```
+You will need `clang-format` installed to use the `format` command.
+
+Once done with your coding then the released/patch/fixed code can be compiled, with all the normal optimisations, using:
+```
+./configure --prefix=/usr && make && make install
+```
+
+## Automating the download and compilation process for Debian based distros.
+
+Here's a script that will do just that! It will create a directory in your home folder called 'nwipe_master'. It installs all the libraries required to compile the software (build-essential) and all the libraries that nwipe requires (libparted etc). It downloads the latest master copy of nwipe from github. It then compiles the software and then runs the latest nwipe. It doesn't write over the version of nwipe that's installed in the repository (If you had nwipe already installed). To run the latest master version of nwipe manually you would run it like this `sudo ~/nwipe_master/nwipe/src/nwipe`
+
+You can run the script multiple times; the first time it's run it will install all the libraries; subsequent times it will just say the libraries are up to date. As it always downloads a fresh copy of the nwipe master from Github, you can always stay up to date. Just run it to get the latest version of nwipe. It only takes 11 seconds to compile on my i7.
+
+If you already have nwipe installed from the repository, you need to take care which version you are running. If you typed `nwipe` from any directory it will always run the original repository copy of nwipe. To run the latest nwipe you have to explicitly tell it where the new copy is, e.g in the directory `~/nwipe_master/nwipe/src`. That's why you would run it by typing `sudo ~/nwipe_master/nwipe/src/nwipe` alternatively you could cd to the directory and run it like this:
+
+```
+cd ~/nwipe_master/nwipe/src
+./nwipe
+```
+
+Note the ./, that means only look in the current directory for nwipe. if you forgot to type ./ the computer would run the older repository version of nwipe.
+
+Once you have copied the script below into a file called buildnwipe, you need to give the file execute permissions `chmod +x buildnwipe` before you can run it. [Download script](
+https://drive.google.com/file/d/1BsQDlMqtEycAgfk9FpG1sxv3jFz5dzNO/view?usp=sharing)
+```
+#!/bin/bash
+cd "$HOME"
+nwipe_directory="nwipe_master"
+mkdir $nwipe_directory
+cd $nwipe_directory
+sudo apt install build-essential pkg-config automake libncurses5-dev autotools-dev libparted-dev dmidecode readlink smartmontools git
+rm -rf nwipe
+git clone https://github.com/martijnvanbrummelen/nwipe.git
+cd "nwipe"
+./autogen.sh
+./configure
+make
+cd "src"
+sudo ./nwipe
+```
+
+## Quick & Easy, USB bootable version of nwipe master for x86_64 systems.
+If you want to just try out a bootable version of nwipe you can download [ShredOS](https://github.com/PartialVolume/shredos.x86_64). The ShredOS image is around 60MB and can be written to an USB flash drive in seconds, allowing you to boot straight into the latest version of nwipe. ShredOS is available for x86_64 (64-bit) and i686 (32-bit) CPU architectures and will boot both legacy BIOS and UEFI devices. It comes as .IMG (bootable USB flash drive image) or .ISO (for CD-R/DVD-R). Instructions and download can be found [here](https://github.com/PartialVolume/shredos.x86_64#obtaining-and-writing-shredos-to-a-usb-flash-drive-the-easy-way-).
+
+## Which Linux distro uses the latest nwipe?
+See [Repology](https://repology.org/project/nwipe/versions)
+
+And in addition checkout the following distros that all include nwipe:
+
+- [ShredOS](https://github.com/PartialVolume/shredos.x86_64) Always has the latest nwipe release.
+- [netboot.xyz](https://github.com/netbootxyz/netboot.xyz) Can network-boot ShredOS.
+- [partedmagic](https://partedmagic.com)
+- [SystemRescueCD](https://www.system-rescue.org)
+- [gparted live](https://sourceforge.net/projects/gparted/files/gparted-live-testing/1.2.0-2/)
+
+Know of other distros that include nwipe? Then please let us know or issue a PR on this README.md. Thanks.
+
+## Bugs
+
+Bugs can be reported on GitHub:
+https://github.com/martijnvanbrummelen/nwipe
+
+## License
+
+GNU General Public License v2.0
diff --git a/autogen.sh b/autogen.sh
new file mode 100755
index 0000000..da9a805
--- /dev/null
+++ b/autogen.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# Script to create all the required autoconf files
+
+aclocal
+autoheader
+automake --add-missing
+autoconf
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..7c3f0bc
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,68 @@
+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.64])
+AC_INIT([nwipe], [0.33], [git@brumit.nl])
+AM_INIT_AUTOMAKE(foreign subdir-objects)
+AC_OUTPUT(Makefile src/Makefile man/Makefile)
+AC_CONFIG_SRCDIR([src/nwipe.c])
+AC_CONFIG_HEADERS([config.h])
+
+# Checks for programs.
+AC_PROG_CC
+PKG_PROG_PKG_CONFIG
+
+# Checks for libraries.
+
+PKG_CHECK_MODULES(
+	[PANEL],
+	[panel],
+	[
+		CFLAGS="${CFLAGS} ${PANEL_CFLAGS}"
+		LIBS="${LIBS} ${PANEL_LIBS}"
+	],
+	[AC_CHECK_LIB([panel], [main], [
+		LIBS="-lpanel $LIBS"
+		AC_CHECK_HEADERS(panel.h,, [
+		    AC_CHECK_HEADERS(ncurses/panel.h, [
+			AC_DEFINE([PANEL_IN_SUBDIR], [ncurses/], [Look for ncurses headers in subdir])
+			], [AC_MSG_ERROR([ncurses panel headers not found])])
+		])
+	    ], [AC_MSG_ERROR([ncurses panel library not found])])]
+)
+
+PKG_CHECK_MODULES(
+	[NCURSES],
+	[ncurses],
+	[
+		CFLAGS="${CFLAGS} ${NCURSES_CFLAGS}"
+		LIBS="${LIBS} ${NCURSES_LIBS}"
+	],
+	[AC_CHECK_LIB([ncurses], [delscreen], [
+		LIBS="-lncurses $LIBS"
+		AC_CHECK_HEADERS(ncurses.h,, [
+		    AC_CHECK_HEADERS(ncurses/ncurses.h, [
+			AC_DEFINE([NCURSES_IN_SUBDIR], [ncurses/], [Look for ncurses headers in subdir])
+			], [AC_MSG_ERROR([ncurses headers not found])])
+		])
+	    ], [AC_MSG_ERROR([ncurses development library not found])]
+	)]
+)
+
+AC_CHECK_LIB([intl], [libintl_dgettext]) # needed to statically link libparted, but not given in its pkgconfig file
+AC_CHECK_LIB([uuid], [uuid_generate])    # needed to statically link libparted, but not given in its pkgconfig file
+PKG_CHECK_MODULES([PARTED], [libparted])
+AC_CHECK_LIB([pthread], [main], ,[AC_MSG_ERROR([pthread development library not found])])
+
+# Checks for header files.
+AC_CHECK_HEADERS([fcntl.h inttypes.h netinet/in.h stddef.h stdint.h stdlib.h string.h sys/file.h sys/ioctl.h unistd.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_TYPE_SIZE_T
+AC_CHECK_MEMBERS([struct stat.st_blksize])
+
+# Checks for library functions.
+AC_FUNC_MALLOC
+AC_CHECK_FUNCS([fdatasync memset regcomp strdup strerror])
+
+AC_OUTPUT
diff --git a/images/example_wipe.gif b/images/example_wipe.gif
new file mode 100644
index 0000000..68575a8
--- /dev/null
+++ b/images/example_wipe.gif
diff --git a/man/Makefile.am b/man/Makefile.am
new file mode 100644
index 0000000..74200bc
--- /dev/null
+++ b/man/Makefile.am
@@ -0,0 +1 @@
+dist_man_MANS = nwipe.1
diff --git a/man/nwipe.1 b/man/nwipe.1
new file mode 100644
index 0000000..01a1a70
--- /dev/null
+++ b/man/nwipe.1
@@ -0,0 +1,139 @@
+.TH NWIPE "1" "March 2022" "nwipe version 0.33" "User Commands"
+.SH NAME
+nwipe \- securely erase disks
+.SH SYNOPSIS
+.B nwipe
+[\fIoptions\fR] [\fIdevice1\fR] [\fIdevice2\fR] ...
+.SH DESCRIPTION
+nwipe is a command that will securely erase disks using a variety of
+recognised methods.  It is a fork of the dwipe command used by Darik's Boot
+and Nuke (dban).  nwipe is included with partedmagic if you want a quick and
+easy bootable CD version.  nwipe was created out of a need to run the DBAN
+dwipe command outside of DBAN, in order to allow its use with any host
+distribution, thus giving better hardware support.  It is essentially the
+same as dwipe, with a few changes:
+.TP
+- pthreads is used instead of fork
+.TP
+- The parted library is used to detect drives
+.TP
+- The code is designed to be compiled with gcc
+.TP
+- SIGUSR1 can be used to log the stats of the current wipe
+
+.SH OPTIONS
+.TP
+\fB\-V\fR, \fB\-\-version\fR
+Prints the version number
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Prints a help summary
+.TP
+\fB\-\-autonuke\fR
+If no devices have been specified on the command line, starts wiping all
+devices immediately. If devices have been specified, starts wiping only
+those specified devices immediately.
+.TP
+\fB\-\-autopoweroff\fR
+Power off system on completion of wipe delayed for for one minute. During
+this one minute delay you can abort the shutdown by typing sudo shutdown -c
+.TP
+\fB\-\-sync\fR=\fINUM\fR
+Will perform a syn after NUM writes (default: 100000)
+.IP
+0    \- fdatasync after the disk is completely written
+       fdatasync errors not detected until completion.
+       0 is not recommended as disk errors may cause nwipe
+       to appear to hang
+.IP
+1    \- fdatasync after every write
+       Warning: Lower values will reduce wipe speeds.
+.IP
+1000 \- fdatasync after 1000 writes
+.TP
+\fB\-\-noblank\fR
+Do not perform the final blanking pass after the wipe (default is to blank,
+except when the method is RCMP TSSIT OPS\-II).
+.TP
+\fB\-\-nowait\fR
+Do not wait for a key before exiting (default is to wait).
+.TP
+\fB\-\-nosignals\fR
+Do not allow signals to interrupt a wipe (default is to allow).
+.TP
+\fB\-\-nousb\fR
+Do not show or wipe any USB devices, whether in GUI, --nogui or autonuke
+mode. (default is to allow USB devices to be shown and wiped).
+.TP
+\fB\-\-nogui\fR
+Do not show the GUI interface. Can only be used with the autonuke option.
+Nowait option is automatically invoked with the nogui option.
+SIGUSR1 can be used to retrieve the current wiping statistics.
+.TP
+\fB\-v\fR, \fB\-\-verbose\fR
+Log more messages, useful for debugging.
+.TP
+\fB\-\-verify\fR=\fITYPE\fR
+Whether to perform verification of erasure (default: last)
+.IP
+off   \- Do not verify
+.IP
+last  \- Verify after the last pass
+.IP
+all   \- Verify every pass
+.IP
+Please mind that HMG IS5 enhanced always verifies the last (PRNG) pass
+regardless of this option.
+.TP
+\fB\-m\fR, \fB\-\-method\fR=\fIMETHOD\fR
+The wiping method (default: dodshort).
+.IP
+dod522022m / dod       \- 7 pass DOD 5220.22\-M method
+.IP
+dodshort / dod3pass    \- 3 pass DOD method
+.IP
+gutmann                \- Peter Gutmann's Algorithm
+.IP
+ops2                   \- RCMP TSSIT OPS\-II
+.IP
+random / prng / stream \- PRNG Stream
+.IP
+zero / quick           \- Overwrite with zeros 0x00
+.IP
+one                    \- Overwrite with ones 0xFF
+.IP
+verify_zero            \- Verifies disk is zero filled
+.IP
+verify_one             \- Verifies disk is 0xFF filled
+.IP
+is5enh                 \- HMG IS5 enhanced
+.TP
+\fB\-l\fR, \fB\-\-logfile\fR=\fIFILE\fR
+Filename to log to. Default is STDOUT
+.TP
+\fB\-p\fR, \fB\-\-prng\fR=\fIMETHOD\fR
+PRNG option (mersenne|twister|isaac|isaac64)
+.TP
+\fB\-q\fR, \fB\-\-quiet\fR
+Anonymize serial numbers, Gui & logs display:
+ XXXXXXXX = S/N obtained & anonymized.
+ ???????? = S/N not available.
+.TP
+\fB\-r\fR, \fB\-\-rounds\fR=\fINUM\fR
+Number of times to wipe the device using the selected method (default: 1)
+.TP
+\fB\-e\fR, \fB\-\-exclude\fR=\fIDEVICES\fR
+Up to ten comma separated devices to be excluded, examples:
+ --exclude=/dev/sdc
+ --exclude=/dev/sdc,/dev/sdd
+.SH BUGS
+Please see the GitHub site for the latest list
+(https://github.com/martijnvanbrummelen/nwipe/issues)
+.SH AUTHOR
+Nwipe is developed by Martijn van Brummelen <github@brumit.nl>
+.SH "SEE ALSO"
+.BR shred (1),
+.BR dwipe (1),
+.BR dd (1),
+.BR dcfldd (1),
+.BR dc3dd (1)
diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..f4fea2f
--- /dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,10 @@
+# what flags you want to pass to the C compiler & linker
+#CFLAGS = -lncurses -lparted
+AM_CFLAGS =
+AM_LDFLAGS =
+
+# this lists the binaries to produce, the (non-PHONY, binary) targets in
+# the previous manual Makefile
+bin_PROGRAMS = nwipe
+nwipe_SOURCES = context.h logging.h options.h prng.h version.h temperature.h nwipe.c gui.c method.h pass.c device.c gui.h isaac_rand/isaac_standard.h isaac_rand/isaac_rand.h isaac_rand/isaac_rand.c isaac_rand/isaac64.h isaac_rand/isaac64.c mt19937ar-cok/mt19937ar-cok.c nwipe.h mt19937ar-cok/mt19937ar-cok.h pass.h device.h logging.c method.c options.c prng.c version.c temperature.c
+nwipe_LDADD = $(PARTED_LIBS)
diff --git a/src/context.h b/src/context.h
new file mode 100644
index 0000000..26e3432
--- /dev/null
+++ b/src/context.h
@@ -0,0 +1,187 @@
+/*
+ *  context.h: The internal state representation of nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef CONTEXT_H_
+#define CONTEXT_H_
+
+#include "prng.h"
+
+typedef enum nwipe_device_t_ {
+    NWIPE_DEVICE_UNKNOWN = 0,  // Unknown device.
+    NWIPE_DEVICE_IDE,
+    NWIPE_DEVICE_SCSI,
+    NWIPE_DEVICE_COMPAQ,  // Unimplemented.
+    NWIPE_DEVICE_USB,
+    NWIPE_DEVICE_IEEE1394,  // Unimplemented.
+    NWIPE_DEVICE_ATA,
+    NWIPE_DEVICE_NVME,
+    NWIPE_DEVICE_VIRT,
+    NWIPE_DEVICE_SAS
+} nwipe_device_t;
+
+typedef enum nwipe_pass_t_ {
+    NWIPE_PASS_NONE = 0,  // Not running.
+    NWIPE_PASS_WRITE,  // Writing patterns to the device.
+    NWIPE_PASS_VERIFY,  // Verifying a pass.
+    NWIPE_PASS_FINAL_BLANK,  // Filling the device with zeros.
+    NWIPE_PASS_FINAL_OPS2  // Special case for nwipe_ops2.
+} nwipe_pass_t;
+
+typedef enum nwipe_select_t_ {
+    NWIPE_SELECT_NONE = 0,  // Unused.
+    NWIPE_SELECT_TRUE,  // Wipe this device.
+    NWIPE_SELECT_TRUE_PARENT,  // A parent of this device has been selected, so the wipe is implied.
+    NWIPE_SELECT_FALSE,  // Do not wipe this device.
+    NWIPE_SELECT_FALSE_CHILD,  // A child of this device has been selected, so we can't wipe this device.
+    NWIPE_SELECT_DISABLED  // Do not wipe this device and do not allow it to be selected.
+} nwipe_select_t;
+
+#define NWIPE_KNOB_SPEEDRING_SIZE 30
+#define NWIPE_KNOB_SPEEDRING_GRANULARITY 10
+
+typedef struct nwipe_speedring_t_
+{
+    u64 bytes[NWIPE_KNOB_SPEEDRING_SIZE];
+    u64 bytestotal;
+    u64 byteslast;
+    time_t times[NWIPE_KNOB_SPEEDRING_SIZE];
+    time_t timestotal;
+    time_t timeslast;
+    u32 position;
+} nwipe_speedring_t;
+
+#define NWIPE_DEVICE_LABEL_LENGTH 200
+#define NWIPE_DEVICE_SIZE_TXT_LENGTH 7
+
+// Arbitary length, so far most paths don't exceed about 25 characters
+#define MAX_HWMON_PATH_LENGTH 100
+
+typedef struct nwipe_context_t_
+{
+    /*
+     * Device fields
+     */
+    int device_block_size;  // The soft block size reported by the device.
+    int device_sector_size;  // The hard sector size reported by the device.
+    int device_bus;  // The device bus number.
+    int device_fd;  // The file descriptor of the device file being wiped.
+    int device_host;  // The host number.
+    struct hd_driveid device_id;  // The WIN_IDENTIFY data for IDE drives.
+    int device_lun;  // The device logical unit number.
+    int device_major;  // The major device number.
+    int device_minor;  // The minor device number.
+    int device_part;  // The device partition or slice number.
+    char* device_name;  // The device file name.
+    char device_name_without_path[100];
+    char gui_device_name[100];
+    unsigned long long device_size;  // The device size in bytes.
+    char* device_size_text;  // The device size in a more (human)readable format.
+    char device_size_txt[NWIPE_DEVICE_SIZE_TXT_LENGTH];  // The device size in a more (human)readable format.
+    char* device_model;  // The model of the device.
+    char device_label[NWIPE_DEVICE_LABEL_LENGTH];  // The label (name, model, size and serial) of the device.
+    struct stat device_stat;  // The device file state from fstat().
+    nwipe_device_t device_type;  // Indicates an IDE, SCSI, or Compaq SMART device in enumerated form (int)
+    char device_type_str[14];  // Indicates an IDE, SCSI, USB etc as per nwipe_device_t but in ascii
+    char device_serial_no[21];  // Serial number(processed, 20 characters plus null termination) of the device.
+    int device_target;  // The device target.
+
+    u64 eta;  // The estimated number of seconds until method completion.
+    int entropy_fd;  // The entropy source. Usually /dev/urandom.
+    int pass_count;  // The number of passes performed by the working wipe method.
+    u64 pass_done;  // The number of bytes that have already been i/o'd in this pass.
+    u64 pass_errors;  // The number of errors across all passes.
+    u64 pass_size;  // The total number of i/o bytes across all passes.
+    nwipe_pass_t pass_type;  // The type of the current working pass.
+    int pass_working;  // The current working pass.
+    nwipe_prng_t* prng;  // The PRNG implementation.
+    nwipe_entropy_t prng_seed;  // The random data that is used to seed the PRNG.
+    void* prng_state;  // The private internal state of the PRNG.
+    int result;  // The process return value.
+    int round_count;  // The number of rounds performed by the working wipe method.
+    u64 round_done;  // The number of bytes that have already been i/o'd.
+    u64 round_errors;  // The number of errors across all rounds.
+    u64 round_size;  // The total number of i/o bytes across all rounds.
+    double round_percent;  // The percentage complete across all rounds.
+    int round_working;  // The current working round.
+    nwipe_select_t select;  // Indicates whether this device should be wiped.
+    int signal;  // Set when the child is killed by a signal.
+    nwipe_speedring_t speedring;  // Ring buffer for computing the rolling throughput average.
+    short sync_status;  // A flag to indicate when the method is syncing.
+    pthread_t thread;  // The ID of the thread.
+    u64 throughput;  // Average throughput in bytes per second.
+    u64 verify_errors;  // The number of verification errors across all passes.
+    char temp1_path[MAX_HWMON_PATH_LENGTH];  // path to temperature variables /sys/class/hwmon/hwmonX/ etc.
+    int temp1_crit;  // Critical high drive temperature, 1000000=unitialised, millidegree celsius.
+    int temp1_highest;  // Historical highest temperature reached, 1000000=unitialised, millidegree celsius.
+    int temp1_input;  // drive temperature, -1=unitialised. 1000000=unitialised, millidegree celsius.
+    int temp1_lcrit;  // Critical low drive temperature, 1000000=unitialised, millidegree celsius.
+    int temp1_lowest;  // Historically lowest temperature, 1000000=unitialised, millidegree celsius.
+    int temp1_max;  // Maximum allowed temperature, 1000000=unitialised, millidegree celsius.
+    int temp1_min;  // Miniumum allowed temperature, 1000000=unitialised, millidegree celsius.
+    int temp1_monitored_wipe_max;
+    int temp1_monitored_wipe_min;
+    int temp1_monitored_wipe_avg;
+    int temp1_flash_rate;  // number relates to one tenth of a second, so 2 means a flash on and off = 0.4s
+    int temp1_flash_rate_counter;  // used by the gui for timing the flash rate
+    int temp1_flash_rate_status;  // 0=blank 1=visible
+    time_t temp1_time;  // The time when temperature was last checked, seconds since epoch
+    int wipe_status;  // Wipe finished = 0, wipe in progress = 1, wipe yet to start = -1.
+    int spinner_idx;  // Index into the spinner character array
+    char spinner_character[1];  // The current spinner character
+    double duration;  // Duration of the wipe in seconds
+    time_t start_time;  // Start time of wipe
+    time_t end_time;  // End time of wipe
+    u64 fsyncdata_errors;  // The number of fsyncdata errors across all passes.
+    /*
+     * Identity contains the raw serial number of the drive
+     * (where applicable), however, for use within nwipe use the
+     * processed serial_no[21] string above. To access serial no. use
+     * c[i]->serial_no) and not c[i]->identity.serial_no);
+     */
+    struct hd_driveid identity;
+} nwipe_context_t;
+
+/*
+ * We use 2 data structs to pass data between threads.
+ * The first contains any required values.
+ * Values cannot form part of the second array below, hence the need for this.
+ */
+typedef struct
+{
+    int nwipe_enumerated;  // The number of devices available.
+    int nwipe_selected;  // The number of devices being wiped.
+    time_t maxeta;  // The estimated runtime of the slowest device.
+    u64 throughput;  // Total throughput.
+    u64 errors;  // The combined number of errors of all processes.
+    pthread_t* gui_thread;  // The ID of GUI thread.
+} nwipe_misc_thread_data_t;
+
+/*
+ * The second points to the first structure, as well as the structure of all the devices
+ */
+typedef struct
+{
+    nwipe_context_t** c;  // Pointer to the nwipe context structure.
+    nwipe_misc_thread_data_t* nwipe_misc_thread_data;  // Pointer to the misc structure above.
+} nwipe_thread_data_ptr_t;
+
+#endif /* CONTEXT_H_ */
diff --git a/src/device.c b/src/device.c
new file mode 100644
index 0000000..b7a87f5
--- /dev/null
+++ b/src/device.c
@@ -0,0 +1,829 @@
+/*
+ *  device.c:  Device routines for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "nwipe.h"
+#include "context.h"
+#include "device.h"
+#include "method.h"
+#include "options.h"
+#include "logging.h"
+#include <sys/ioctl.h>
+#include <linux/hdreg.h>  // Drive specific defs
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+#include <parted/parted.h>
+#include <parted/debug.h>
+
+int check_device( nwipe_context_t*** c, PedDevice* dev, int dcount );
+char* trim( char* str );
+
+extern int terminate_signal;
+
+int nwipe_device_scan( nwipe_context_t*** c )
+{
+    /**
+     * Scans the filesystem for storage device names.
+     *
+     * @parameter device_names  A reference to a null array pointer.
+     * @modifies  device_names  Populates device_names with an array of nwipe_contect_t
+     * @returns                 The number of strings in the device_names array.
+     *
+     */
+
+    PedDevice* dev = NULL;
+    ped_device_probe_all();
+
+    int dcount = 0;
+
+    while( ( dev = ped_device_get_next( dev ) ) )
+    {
+        if( check_device( c, dev, dcount ) )
+            dcount++;
+
+        /* Don't bother scanning drives if the terminate signal is active ! as in the case of
+         * the readlink program missing which is required if the --nousb option has been specified */
+        if( terminate_signal == 1 )
+        {
+            break;
+        }
+    }
+
+    /* Return the number of devices that were found. */
+    return dcount;
+
+} /* nwipe_device_scan */
+
+int nwipe_device_get( nwipe_context_t*** c, char** devnamelist, int ndevnames )
+{
+    /**
+     * Gets information about devices
+     *
+     * @parameter device_names  A reference to a null array pointer.
+     * @parameter devnamelist   An array of string pointers to the device names
+     * @parameter ndevnames     Number of elements in devnamelist
+     * @modifies  device_names  Populates device_names with an array of nwipe_contect_t
+     * @returns                 The number of strings in the device_names array.
+     *
+     */
+
+    PedDevice* dev = NULL;
+
+    int i;
+    int dcount = 0;
+
+    for( i = 0; i < ndevnames; i++ )
+    {
+
+        dev = ped_device_get( devnamelist[i] );
+        if( !dev )
+        {
+            nwipe_log( NWIPE_LOG_WARNING, "Device %s not found", devnamelist[i] );
+            continue;
+        }
+
+        if( check_device( c, dev, dcount ) )
+            dcount++;
+
+        /* Don't bother scanning drives if the terminate signal is active ! as in the case of
+         * the readlink program missing which is required if the --nousb option has been specified */
+        if( terminate_signal == 1 )
+        {
+            break;
+        }
+    }
+
+    /* Return the number of devices that were found. */
+    return dcount;
+
+} /* nwipe_device_get */
+
+int check_device( nwipe_context_t*** c, PedDevice* dev, int dcount )
+{
+    /* Populate this struct, then assign it to overall array of structs. */
+    nwipe_context_t* next_device;
+    int fd;
+    int idx;
+    int r;
+    char tmp_serial[21];
+    nwipe_device_t bus;
+
+    bus = 0;
+
+    /* Check whether this drive is on the excluded drive list ? */
+    idx = 0;
+    while( idx < 10 )
+    {
+        if( !strcmp( dev->path, nwipe_options.exclude[idx++] ) )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "Device %s excluded as per command line option -e", dev->path );
+            return 0;
+        }
+    }
+
+    /* Check whether the user has specified using the --nousb option
+     * that all USB devices should not be displayed or wiped whether
+     * in GUI, --nogui or --autonuke modes */
+
+    if( nwipe_options.nousb )
+    {
+        /* retrieve bus and drive serial number, HOWEVER we are only interested in the bus at this time */
+        r = nwipe_get_device_bus_type_and_serialno( dev->path, &bus, tmp_serial );
+
+        /* See nwipe_get_device_bus_type_and_serialno() function for meaning of these codes */
+        if( r == 0 || ( r >= 3 && r <= 6 ) )
+        {
+            if( bus == NWIPE_DEVICE_USB )
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "Device %s ignored as per command line option --nousb", dev->path );
+                return 0;
+            }
+        }
+        else
+        {
+            if( r == 2 )
+            {
+                nwipe_log(
+                    NWIPE_LOG_NOTICE, "--nousb requires the 'readlink' program, please install readlink", dev->path );
+                terminate_signal = 1;
+                return 0;
+            }
+        }
+    }
+
+    /* Try opening the device to see if it's valid. Close on completion. */
+    if( !ped_device_open( dev ) )
+    {
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to open device" );
+        return 0;
+    }
+    ped_device_close( dev );
+
+    /* New device, reallocate memory for additional struct pointer */
+    *c = realloc( *c, ( dcount + 1 ) * sizeof( nwipe_context_t* ) );
+
+    next_device = malloc( sizeof( nwipe_context_t ) );
+
+    /* Check the allocation. */
+    if( !next_device )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to create the array of enumeration contexts." );
+        return 0;
+    }
+
+    /* Zero the allocation. */
+    memset( next_device, 0, sizeof( nwipe_context_t ) );
+
+    /* Get device information */
+    next_device->device_model = dev->model;
+    remove_ATA_prefix( next_device->device_model );
+
+    /* full device name, i.e. /dev/sda */
+    next_device->device_name = dev->path;
+
+    /* remove /dev/ from device, right justify and prefix name so string length is eight characters */
+    nwipe_strip_path( next_device->device_name_without_path, next_device->device_name );
+
+    /* To maintain column alignment in the gui we have to remove /dev/ from device names that
+     * exceed eight characters including the /dev/ path.
+     */
+    if( strlen( next_device->device_name ) > MAX_LENGTH_OF_DEVICE_STRING )
+    {
+        strcpy( next_device->gui_device_name, next_device->device_name_without_path );
+    }
+    else
+    {
+        strcpy( next_device->gui_device_name, next_device->device_name );
+    }
+
+    next_device->device_size = dev->length * dev->sector_size;
+    Determine_C_B_nomenclature( next_device->device_size, next_device->device_size_txt, NWIPE_DEVICE_SIZE_TXT_LENGTH );
+    next_device->device_size_text = next_device->device_size_txt;
+    next_device->result = -2;
+
+    /* Attempt to get serial number of device.
+     */
+    next_device->device_serial_no[0] = 0; /* initialise the serial number */
+
+    if( ( fd = open( next_device->device_name = dev->path, O_RDONLY ) ) == ERR )
+    {
+        nwipe_log( NWIPE_LOG_WARNING, "Unable to open device %s to obtain serial number", next_device->device_name );
+    }
+
+    /*
+     * We don't check the ioctl return status because there are plenty of situations where a serial number may not be
+     * returned by ioctl such as USB drives, logical volumes, encryted volumes, so the log file would have multiple
+     * benign ioctl errors reported which isn't necessarily a problem.
+     */
+    ioctl( fd, HDIO_GET_IDENTITY, &next_device->identity );
+    close( fd );
+
+    for( idx = 0; idx < 20; idx++ )
+    {
+        next_device->device_serial_no[idx] = next_device->identity.serial_no[idx];
+    }
+
+    // Terminate the string.
+    next_device->device_serial_no[20] = 0;
+
+    // Remove leading/trailing whitespace from serial number and left justify.
+    trim( (char*) next_device->device_serial_no );
+
+    /* if we couldn't obtain serial number by using the above method .. try this */
+    r = nwipe_get_device_bus_type_and_serialno( next_device->device_name, &next_device->device_type, tmp_serial );
+
+    /* If serial number & bus retrieved (0) OR unsupported USB bus identified (5) */
+    if( r == 0 || r == 5 )
+    {
+        /* If the serial number hasn't already been populated */
+        if( next_device->device_serial_no[0] == 0 )
+        {
+            strcpy( next_device->device_serial_no, tmp_serial );
+        }
+    }
+
+    /* Does the user want to anonymize serial numbers ? */
+    if( nwipe_options.quiet )
+    {
+        if( next_device->device_serial_no[0] == 0 )
+        {
+            strcpy( next_device->device_serial_no, "???????????????" );
+        }
+        else
+        {
+            strcpy( next_device->device_serial_no, "XXXXXXXXXXXXXXX" );
+        }
+    }
+
+    /* All device strings should be 4 characters, prefix with space if under 4 characters */
+    switch( next_device->device_type )
+    {
+        case NWIPE_DEVICE_UNKNOWN:
+            strcpy( next_device->device_type_str, " UNK" );
+            break;
+
+        case NWIPE_DEVICE_IDE:
+            strcpy( next_device->device_type_str, " IDE" );
+            break;
+
+        case NWIPE_DEVICE_SCSI:
+            strcpy( next_device->device_type_str, " SCSI" );
+            break;
+
+        case NWIPE_DEVICE_COMPAQ:
+            strcpy( next_device->device_type_str, " CPQ" );
+            break;
+
+        case NWIPE_DEVICE_USB:
+            strcpy( next_device->device_type_str, " USB" );
+            break;
+
+        case NWIPE_DEVICE_IEEE1394:
+            strcpy( next_device->device_type_str, "1394" );
+            break;
+
+        case NWIPE_DEVICE_ATA:
+            strcpy( next_device->device_type_str, " ATA" );
+            break;
+
+        case NWIPE_DEVICE_NVME:
+            strcpy( next_device->device_type_str, "NVME" );
+            break;
+
+        case NWIPE_DEVICE_VIRT:
+            strcpy( next_device->device_type_str, "VIRT" );
+            break;
+
+        case NWIPE_DEVICE_SAS:
+            strcpy( next_device->device_type_str, " SAS" );
+            break;
+    }
+
+    if( strlen( (const char*) next_device->device_serial_no ) )
+    {
+        snprintf( next_device->device_label,
+                  NWIPE_DEVICE_LABEL_LENGTH,
+                  "%s %s [%s] %s/%s",
+                  next_device->device_name,
+                  next_device->device_type_str,
+                  next_device->device_size_text,
+                  next_device->device_model,
+                  next_device->device_serial_no );
+    }
+    else
+    {
+        snprintf( next_device->device_label,
+                  NWIPE_DEVICE_LABEL_LENGTH,
+                  "%s %s [%s] %s",
+                  next_device->device_name,
+                  next_device->device_type_str,
+                  next_device->device_size_text,
+                  next_device->device_model );
+    }
+
+    nwipe_log( NWIPE_LOG_NOTICE,
+               "Found %s, %s, %s, %s, S/N=%s",
+               next_device->device_name,
+               next_device->device_type_str,
+               next_device->device_model,
+               next_device->device_size_text,
+               next_device->device_serial_no );
+
+    ( *c )[dcount] = next_device;
+    return 1;
+}
+
+/* Remove leading/trailing whitespace from a string and left justify result */
+char* trim( char* str )
+{
+    size_t len = 0;
+    char* frontp = str;
+    char* endp = NULL;
+
+    if( str == NULL )
+    {
+        return NULL;
+    }
+    if( str[0] == '\0' )
+    {
+        return str;
+    }
+    len = strlen( str );
+    endp = str + len;
+
+    /*
+     * Move the front and back pointers to address the first non-whitespace
+     * characters from each end.
+     */
+    while( isspace( (unsigned char) *frontp ) )
+    {
+        ++frontp;
+    }
+    if( endp != frontp )
+    {
+        while( isspace( (unsigned char) *( --endp ) ) && endp != frontp )
+        {
+        }
+    }
+    if( str + len - 1 != endp )
+        *( endp + 1 ) = '\0';
+    else if( frontp != str && endp == frontp )
+        *str = '\0';
+    /*
+     * Shift the string so that it starts at str so that if it's dynamically
+     * allocated, we can still free it on the returned pointer.  Note the reuse
+     * of endp to mean the front of the string buffer now.
+     */
+    endp = str;
+    if( frontp != str )
+    {
+        while( *frontp )
+        {
+            *endp++ = *frontp++;
+        }
+        *endp = '\0';
+    }
+    return str;
+}
+
+int nwipe_get_device_bus_type_and_serialno( char* device, nwipe_device_t* bus, char* serialnumber )
+{
+    /* The caller provides a string that contains the device, i.e. /dev/sdc, also a pointer
+     * to a integer (bus type) and thirdly a 21 byte
+     * character string which this function populates with the serial number (20 characters + null terminator).
+     *
+     * The function populates the bus integer and serial number strings for the given device.
+     * Results for bus would typically be ATA or USB see nwipe_device_t in context.h
+     *
+     * Return Values:
+     * 0 = Success
+     * 1 = popen failed to create stream for readlink
+     * 2 = readlink exit code not 0, see nwipe logs
+     * 3 = popen failed to create stream for smartctl
+     * 4 = smartctl command not found, install smartmontools
+     * 5 = smartctl detected unsupported USB to IDE/SATA adapter
+     * 6 = All other errors !
+     *
+     */
+
+    FILE* fp;
+
+    int r;  // A result buffer.
+    int idx_src;
+    int idx_dest;
+    int device_len;
+    int set_return_value;
+    int exit_status;
+    int idx;
+    int idx2;
+
+    char readlink_command[] = "readlink /sys/block/%s";
+    char readlink_command2[] = "/usr/bin/readlink /sys/block/%s";
+    char readlink_command3[] = "/sbin/readlink /sys/block/%s";
+    char smartctl_command[] = "smartctl -i %s";
+    char smartctl_command2[] = "/sbin/smartctl -i %s";
+    char smartctl_command3[] = "/usr/bin/smartctl -i %s";
+    char device_shortform[50];
+    char result[512];
+    char final_cmd_readlink[sizeof( readlink_command ) + sizeof( device_shortform )];
+    char final_cmd_smartctl[sizeof( smartctl_command ) + 256];
+    char* pResult;
+    char smartctl_labels_to_anonymize[][18] = {
+        "serial number:", "lu wwn device id:", "logical unit id:", "" /* Don't remove this empty string !, important */
+    };
+
+    /* Initialise return value */
+    set_return_value = 0;
+
+    *bus = 0;
+
+    /* Scan device name and if device is for instance /dev/sdx then convert to sdx
+     * If already sdx then just copy. */
+
+    idx_dest = 0;
+    device_shortform[idx_dest] = 0;
+    device_len = strlen( device );
+    idx_src = device_len;
+
+    while( idx_src >= 0 )
+    {
+        if( device[idx_src] == '/' || idx_src == 0 )
+        {
+            idx_src++;
+
+            /* Now scan forwards copying the short form device i.e sdc */
+            while( idx_src < device_len )
+            {
+                device_shortform[idx_dest++] = device[idx_src++];
+            }
+            break;
+        }
+        else
+        {
+            idx_src--;
+        }
+    }
+    device_shortform[idx_dest] = 0;
+
+    final_cmd_readlink[0] = 0;
+
+    /* Determine whether we can access readlink, required if the PATH environment is not setup ! (Debian sid 'su' as
+     * opposed to 'su -' */
+    if( system( "which readlink > /dev/null 2>&1" ) )
+    {
+        if( system( "which /sbin/readlink > /dev/null 2>&1" ) )
+        {
+            if( system( "which /usr/bin/readlink > /dev/null 2>&1" ) )
+            {
+                nwipe_log( NWIPE_LOG_WARNING, "Command not found. Install readlink !" );
+                set_return_value = 2;
+
+                /* Return immediately if --nousb specified. Readlink is a requirement for this option. */
+                if( nwipe_options.nousb )
+                {
+                    return set_return_value;
+                }
+            }
+            else
+            {
+                sprintf( final_cmd_readlink, readlink_command3, device_shortform );
+            }
+        }
+        else
+        {
+            sprintf( final_cmd_readlink, readlink_command2, device_shortform );
+        }
+    }
+    else
+    {
+        sprintf( final_cmd_readlink, readlink_command, device_shortform );
+    }
+
+    if( final_cmd_readlink[0] != 0 )
+    {
+
+        fp = popen( final_cmd_readlink, "r" );
+
+        if( fp == NULL )
+        {
+            nwipe_log( NWIPE_LOG_WARNING,
+                       "nwipe_get_device_bus_type_and_serialno: Failed to create stream to %s",
+                       readlink_command );
+
+            set_return_value = 1;
+        }
+
+        if( fp != NULL )
+        {
+            /* Read the output a line at a time - output it. */
+            if( fgets( result, sizeof( result ) - 1, fp ) != NULL )
+            {
+                if( nwipe_options.verbose )
+                {
+                    strip_CR_LF( result );
+                    nwipe_log( NWIPE_LOG_DEBUG, "Readlink: %s", result );
+                }
+
+                /* Scan the readlink results for bus types, i.e. USB or ATA
+                 * Example: readlink
+                 * /sys/block/sdd../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/2-1.3:1.0/host6/target6:0:0/6:0:0:0/block/sdd
+                 */
+
+                if( strstr( result, "/usb" ) != 0 )
+                {
+                    *bus = NWIPE_DEVICE_USB;
+                }
+                else
+                {
+                    if( strstr( result, "/ata" ) != 0 )
+                    {
+                        *bus = NWIPE_DEVICE_ATA;
+                    }
+                    else
+                    {
+                        if( strstr( result, "/nvme/" ) != 0 )
+                        {
+                            *bus = NWIPE_DEVICE_NVME;
+                        }
+                        else
+                        {
+                            if( strstr( result, "/virtual/" ) != 0 )
+                            {
+                                *bus = NWIPE_DEVICE_VIRT;
+                            }
+                        }
+                    }
+                }
+            }
+            /* close */
+            r = pclose( fp );
+
+            if( r > 0 )
+            {
+                exit_status = WEXITSTATUS( r );
+                if( nwipe_options.verbose )
+                {
+                    nwipe_log( NWIPE_LOG_WARNING,
+                               "nwipe_get_device_bus_type_and_serialno(): readlink failed, \"%s\" exit status = %u",
+                               final_cmd_readlink,
+                               exit_status );
+                }
+
+                if( exit_status == 127 )
+                {
+                    nwipe_log( NWIPE_LOG_WARNING, "Command not found. Install Readlink recommended !" );
+                    set_return_value = 2;
+                    if( nwipe_options.nousb )
+                    {
+                        return set_return_value;
+                    }
+                }
+            }
+        }
+    }
+
+    /*
+     * Retrieve smartmontools drive information if USB bridge supports it, so we can retrieve the serial number of the
+     * drive that's on the other side of the USB bridge.. */
+
+    final_cmd_smartctl[0] = 0;
+
+    /* Determine whether we can access smartctl, required if the PATH environment is not setup ! (Debian sid 'su' as
+     * opposed to 'su -' */
+    if( system( "which smartctl > /dev/null 2>&1" ) )
+    {
+        if( system( "which /sbin/smartctl > /dev/null 2>&1" ) )
+        {
+            if( system( "which /usr/bin/smartctl > /dev/null 2>&1" ) )
+            {
+                nwipe_log( NWIPE_LOG_WARNING, "Command not found. Install smartmontools !" );
+            }
+            else
+            {
+                sprintf( final_cmd_smartctl, smartctl_command3, device );
+            }
+        }
+        else
+        {
+            sprintf( final_cmd_smartctl, smartctl_command2, device );
+        }
+    }
+    else
+    {
+        sprintf( final_cmd_smartctl, smartctl_command, device );
+    }
+
+    if( final_cmd_smartctl[0] != 0 )
+    {
+        fp = popen( final_cmd_smartctl, "r" );
+
+        if( fp == NULL )
+        {
+            nwipe_log( NWIPE_LOG_WARNING,
+                       "nwipe_get_device_bus_type_and_serialno(): Failed to create stream to %s",
+                       smartctl_command );
+
+            set_return_value = 3;
+        }
+        else
+        {
+            /* Read the output a line at a time - output it. */
+            while( fgets( result, sizeof( result ) - 1, fp ) != NULL )
+            {
+                /* Convert the label, i.e everything before the ':' to lower case, it's required to
+                 * convert to lower case as smartctl seems to use inconsistent case when labeling
+                 * for serial number, i.e mostly it produces labels "Serial Number:" but occasionaly
+                 * it produces a label "Serial number:" */
+
+                idx = 0;
+                while( result[idx] != 0 && result[idx] != ':' )
+                {
+                    /* If upper case alpha character, change to lower case */
+                    if( result[idx] >= 'A' && result[idx] <= 'Z' )
+                    {
+                        result[idx] += 32;
+                    }
+
+                    idx++;
+                }
+
+                if( nwipe_options.verbose && result[0] != 0x0A )
+                {
+                    strip_CR_LF( result );
+
+                    /* Remove serial number if -q option specified */
+                    if( nwipe_options.quiet )
+                    {
+                        /* initialise index into string array */
+                        idx2 = 0;
+
+                        while( smartctl_labels_to_anonymize[idx2][0] != 0 )
+                        {
+                            if( ( pResult = strstr( result, &smartctl_labels_to_anonymize[idx2][0] ) ) != 0 )
+                            {
+                                /* set index to character after end of label string */
+                                idx = strlen( &smartctl_labels_to_anonymize[idx2][0] );
+
+                                /* Ignore spaces, overwrite other characters */
+                                while( *( pResult + idx ) != 0x0A && *( pResult + idx ) != 0x0D
+                                       && *( pResult + idx ) != 0 && idx <= sizeof( result ) - 1 )
+                                {
+                                    if( *( pResult + idx ) == ' ' )
+                                    {
+                                        idx++;
+                                        continue;
+                                    }
+                                    else
+                                    {
+                                        /* ignore if the serial number has been written over with '?' */
+                                        if( *( pResult + idx ) != '?' )
+                                        {
+                                            *( pResult + idx ) = 'X';
+                                        }
+                                        idx++;
+                                    }
+                                }
+                            }
+                            idx2++;
+                        }
+                    }
+
+                    nwipe_log( NWIPE_LOG_DEBUG, "smartctl: %s", result );
+                }
+
+                if( strstr( result, "serial number:" ) != 0 )
+                {
+                    /* strip any leading or trailing spaces and left justify, +15 is the length of "Serial Number:" */
+                    trim( &result[15] );
+
+                    strncpy( serialnumber, &result[15], 20 );
+                }
+
+                if( *bus == 0 )
+                {
+                    if( strstr( result, "transport protocol:" ) != 0 )
+                    {
+                        /* strip any leading or trailing spaces and left justify, +4 is the length of "bus type:" */
+                        trim( &result[19] );
+
+                        if( strncmp( &result[19], "sas", 3 ) == 0 )
+                        {
+                            *bus = NWIPE_DEVICE_SAS;
+                        }
+                    }
+
+                    if( strstr( result, "sata version is:" ) != 0 )
+                    {
+
+                        /* strip any leading or trailing spaces and left justify, +4 is the length of "bus type:" */
+                        trim( &result[16] );
+
+                        if( strncmp( &result[16], "sata", 4 ) == 0 )
+                        {
+                            *bus = NWIPE_DEVICE_ATA;
+                        }
+                    }
+                }
+            }
+
+            /* close */
+            r = pclose( fp );
+
+            if( r > 0 )
+            {
+                exit_status = WEXITSTATUS( r );
+                if( nwipe_options.verbose && exit_status != 1 )
+                {
+                    nwipe_log( NWIPE_LOG_WARNING,
+                               "nwipe_get_device_bus_type_and_serialno(): smartctl failed, \"%s\" exit status = %u",
+                               final_cmd_smartctl,
+                               exit_status );
+                }
+                set_return_value = 6;
+
+                if( exit_status == 127 )
+                {
+                    nwipe_log( NWIPE_LOG_WARNING, "Command not found. Install Smartctl recommended !" );
+
+                    set_return_value = 4;
+                }
+
+                if( exit_status == 1 )
+                {
+                    nwipe_log( NWIPE_LOG_WARNING, "%s USB bridge, no pass-through support", device );
+
+                    if( *bus == NWIPE_DEVICE_USB )
+                    {
+                        strcpy( serialnumber, "(S/N: unknown)" );
+                        set_return_value = 5;
+                    }
+                }
+            }
+        }
+    }
+
+    return set_return_value;
+}
+
+void strip_CR_LF( char* str )
+{
+    /* In the specified string, replace any CR or LF with a space */
+    int idx = 0;
+    int len = strlen( str );
+    while( idx < len )
+    {
+        if( str[idx] == 0x0A || str[idx] == 0x0D )
+        {
+            str[idx] = ' ';
+        }
+        idx++;
+    }
+}
+
+void remove_ATA_prefix( char* str )
+{
+    /* Remove "ATA" prefix if present in the model no. string, left justifing string */
+
+    int idx_pre = 4;
+    int idx_post = 0;
+
+    if( !strncmp( str, "ATA ", 4 ) )
+    {
+        while( str[idx_pre] != 0 )
+        {
+            str[idx_post++] = str[idx_pre++];
+        }
+
+        str[idx_post] = 0;
+    }
+}
diff --git a/src/device.h b/src/device.h
new file mode 100644
index 0000000..2a5c076
--- /dev/null
+++ b/src/device.h
@@ -0,0 +1,37 @@
+/*
+ *  device.h:  Device routines for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef DEVICE_H_
+#define DEVICE_H_
+
+#define MAX_LENGTH_OF_DEVICE_STRING 8
+
+void nwipe_device_identify( nwipe_context_t* c );  // Get hardware information about the device.
+int nwipe_device_scan( nwipe_context_t*** c );  // Find devices that we can wipe.
+int nwipe_device_get( nwipe_context_t*** c, char** devnamelist, int ndevnames );  // Get info about devices to wipe.
+int nwipe_get_device_bus_type_and_serialno( char*, nwipe_device_t*, char* );
+void strip_CR_LF( char* );
+void determine_disk_capacity_nomenclature( u64, char* );
+void remove_ATA_prefix( char* );
+char* trim( char* );
+
+#endif /* DEVICE_H_ */
diff --git a/src/gui.c b/src/gui.c
new file mode 100644
index 0000000..d0b05a0
--- /dev/null
+++ b/src/gui.c
@@ -0,0 +1,3307 @@
+/*
+ *  gui.c: An ncurses GUI for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+/* RATIONALE:
+ *
+ *   This entire GUI is a non-portable task-specific thunk.
+ *
+ *   The alternatives are, however, no better. The CDK is large and clumsy,
+ *   and things like ncurses libmenu are not worth the storage overhead.
+ *
+ */
+#include <ncurses.h>
+#include <panel.h>
+#include <stdint.h>
+#include <time.h>
+
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "prng.h"
+#include "options.h"
+#include "gui.h"
+#include "pass.h"
+#include "logging.h"
+#include "version.h"
+#include "temperature.h"
+
+#define NWIPE_GUI_PANE 8
+
+/* Header window: width, height, x coordinate, y coordinate. */
+#define NWIPE_GUI_HEADER_W COLS
+#define NWIPE_GUI_HEADER_H 1
+#define NWIPE_GUI_HEADER_X 0
+#define NWIPE_GUI_HEADER_Y 0
+
+/* Footer window: width, height, x coordinate, y coordinate. */
+#define NWIPE_GUI_FOOTER_W COLS
+#define NWIPE_GUI_FOOTER_H 1
+#define NWIPE_GUI_FOOTER_X 0
+#define NWIPE_GUI_FOOTER_Y ( LINES - 1 )
+
+/* Options window: width, height, x coorindate, y coordinate. */
+#define NWIPE_GUI_OPTIONS_W 44
+#define NWIPE_GUI_OPTIONS_H 7
+#define NWIPE_GUI_OPTIONS_Y 1
+#define NWIPE_GUI_OPTIONS_X 0
+
+/* Options fields, relative to their window. */
+#define NWIPE_GUI_OPTIONS_TAB 10
+#define NWIPE_GUI_OPTIONS_ENTROPY_Y 1
+#define NWIPE_GUI_OPTIONS_ENTROPY_X 1
+#define NWIPE_GUI_OPTIONS_PRNG_Y 2
+#define NWIPE_GUI_OPTIONS_PRNG_X 1
+#define NWIPE_GUI_OPTIONS_METHOD_Y 3
+#define NWIPE_GUI_OPTIONS_METHOD_X 1
+#define NWIPE_GUI_OPTIONS_VERIFY_Y 4
+#define NWIPE_GUI_OPTIONS_VERIFY_X 1
+#define NWIPE_GUI_OPTIONS_ROUNDS_Y 5
+#define NWIPE_GUI_OPTIONS_ROUNDS_X 1
+
+/* Stats window: width, height, x coordinate, y coordinate. */
+#define NWIPE_GUI_STATS_W ( COLS - 44 )
+#define NWIPE_GUI_STATS_H 7
+#define NWIPE_GUI_STATS_Y 1
+#define NWIPE_GUI_STATS_X 44
+
+/* Stats fields, relative to their window. */
+#define NWIPE_GUI_STATS_RUNTIME_Y 1
+#define NWIPE_GUI_STATS_RUNTIME_X 1
+#define NWIPE_GUI_STATS_ETA_Y 2
+#define NWIPE_GUI_STATS_ETA_X 1
+#define NWIPE_GUI_STATS_LOAD_Y 3
+#define NWIPE_GUI_STATS_LOAD_X 1
+#define NWIPE_GUI_STATS_THROUGHPUT_Y 4
+#define NWIPE_GUI_STATS_THROUGHPUT_X 1
+#define NWIPE_GUI_STATS_ERRORS_Y 5
+#define NWIPE_GUI_STATS_ERRORS_X 1
+#define NWIPE_GUI_STATS_TAB 16
+
+/* Select window: width, height, x coordinate, y coordinate. */
+#define NWIPE_GUI_MAIN_W COLS
+#define NWIPE_GUI_MAIN_H ( LINES - NWIPE_GUI_MAIN_Y - 1 )
+#define NWIPE_GUI_MAIN_Y 8
+#define NWIPE_GUI_MAIN_X 0
+
+#define SKIP_DEV_PREFIX 5
+
+/* Window pointers. */
+WINDOW* footer_window;
+WINDOW* header_window;
+WINDOW* main_window;
+WINDOW* options_window;
+WINDOW* stats_window;
+
+PANEL* footer_panel;
+PANEL* header_panel;
+PANEL* main_panel;
+PANEL* options_panel;
+PANEL* stats_panel;
+
+/* Options window title. */
+const char* options_title = " Options ";
+
+/* Statistics window title. */
+const char* stats_title = " Statistics ";
+
+/* Footer labels. */
+const char* main_window_footer = "S=Start m=Method p=PRNG v=Verify r=Rounds b=Blanking Space=Select CTRL+C=Quit";
+const char* main_window_footer_warning_lower_case_s = "  WARNING: To start the wipe press SHIFT+S (uppercase S)  ";
+
+const char* main_window_footer_warning_no_blanking_with_ops2 =
+    "  WARNING: Zero blanking is not allowed with ops2 method  ";
+
+const char* main_window_footer_warning_no_blanking_with_verify_only =
+    "  WARNING: Zero blanking is not allowed with verify method  ";
+
+const char* main_window_footer_warning_no_drive_selected =
+    "  No drives selected, use spacebar to select a drive, then press S to start  ";
+
+/* Oddly enough, placing extra quotes around the footer strings fixes corruption to the right
+ * of the footer message when the terminal is resized, a quirk in ncurses? - DO NOT REMOVE THE \" */
+const char* selection_footer = "J=Down K=Up Space=Select Backspace=Cancel Ctrl+C=Quit";
+const char* end_wipe_footer = "B=[Toggle between dark\\blank\\blue screen] Ctrl+C=Quit";
+const char* rounds_footer = "Left=Erase Esc=Cancel Ctrl+C=Quit";
+
+const char* wipes_finished_footer = "Wipe finished - press enter to exit. Logged to STDOUT";
+
+/* The number of lines available in the terminal */
+int stdscr_lines;
+
+/* The number of columns available in the terminal */
+int stdscr_cols;
+
+/* The size of the terminal lines when previously checked */
+int stdscr_lines_previous;
+
+/* The size of the terminal columns when previously checked */
+int stdscr_cols_previous;
+
+int tft_saver = 0;
+
+void nwipe_gui_title( WINDOW* w, const char* s )
+{
+    /**
+     * Prints the string 's' centered on the first line of the window 'w'.
+     */
+
+    /* The number of lines in the window. (Not used.) */
+    int wy;
+    (void) wy; /* flag wy not used to the compiler, to silence warning */
+
+    /* The number of columns in the window. */
+    int wx;
+
+    /* Get the window dimensions. */
+    getmaxyx( w, wy, wx );
+
+    /*Calculate available total margin */
+    int margin = ( wx - strlen( s ) );
+    if( margin < 0 )
+    {
+        margin = 0;
+    }
+
+    /* tft_saver = grey text on black mode */
+    if( tft_saver )
+    {
+        wattron( w, A_BOLD );
+    }
+
+    /* Print the title. */
+    mvwprintw( w, 0, margin / 2, "%s", s );
+
+} /* nwipe_gui_title */
+
+void nwipe_init_pairs( void )
+{
+    if( has_colors() )
+    {
+        /* Initialize color capabilities. */
+        start_color();
+
+        if( can_change_color() )
+        {
+            /* Redefine cyan to gray. */
+            init_color( COLOR_CYAN, 128, 128, 128 );
+        }
+
+        /* If we are in tft saver mode set grey text on black background else
+         * Set white on blue as the emphasis color */
+        if( tft_saver )
+        {
+            init_pair( 1, COLOR_BLACK, COLOR_BLACK );
+        }
+        else
+        {
+            init_pair( 1, COLOR_WHITE, COLOR_BLUE );
+        }
+
+        /* Set gray (or cyan) on blue as the normal color. */
+        init_pair( 2, COLOR_CYAN, COLOR_BLUE );
+
+        /* Set red on blue as the hilite color. */
+        init_pair( 3, COLOR_RED, COLOR_BLUE );
+
+        /* If we are in tft saver mode set grey text on black background else
+         * Set white on blue as the emphasis color */
+        if( tft_saver )
+        {
+            init_pair( 4, COLOR_BLACK, COLOR_BLACK );
+        }
+        else
+        {
+            init_pair( 4, COLOR_BLUE, COLOR_WHITE );
+        }
+
+        /* Set white on green for success messages. */
+        init_pair( 5, COLOR_WHITE, COLOR_GREEN );
+
+        /* Set white on red for failure messages. */
+        init_pair( 6, COLOR_WHITE, COLOR_RED );
+
+        /* Set black on black for when hiding the display. */
+        init_pair( 7, COLOR_BLACK, COLOR_BLACK );
+
+        /* Set green on blue for reverse bold messages */
+        init_pair( 8, COLOR_GREEN, COLOR_WHITE );
+
+        /* Set green on blue for reverse bold error messages */
+        init_pair( 9, COLOR_RED, COLOR_WHITE );
+
+        /* Set black on yellow for warning messages */
+        init_pair( 10, COLOR_BLACK, COLOR_YELLOW );
+
+        /* Set black on blue for minimum temperature reached */
+        init_pair( 11, COLOR_BLACK, COLOR_BLUE );
+
+        /* Set blue on blue to make temperature invisible */
+        init_pair( 12, COLOR_BLUE, COLOR_BLUE );
+
+        /* Set the background style. */
+        wbkgdset( stdscr, COLOR_PAIR( 1 ) | ' ' );
+    }
+}
+
+void nwipe_gui_init( void )
+{
+    /**
+     * Initializes the ncurses gui.
+     */
+
+    /* Initialize the screen. */
+    initscr();
+
+    /* Disable TTY line buffering. */
+    cbreak();
+
+    /* Disable TTY echo. */
+    noecho();
+
+    /* Enable most special keys. */
+    keypad( stdscr, TRUE );
+
+    /* Create the text/background color pairs */
+    nwipe_init_pairs();
+
+    /* Clear the screen. */
+    wclear( stdscr );
+
+    /* Create the header window. */
+    nwipe_gui_create_header_window();
+
+    /* Create the footer window and panel */
+    nwipe_gui_create_footer_window( main_window_footer );
+
+    /* Create the options window and panel */
+    nwipe_gui_create_options_window();
+
+    /* Create the stats window. */
+    nwipe_gui_create_stats_window();
+
+    /* Create a new main window and panel */
+    nwipe_gui_create_main_window();
+
+    update_panels();
+    doupdate();
+
+    /* Hide the cursor. */
+    curs_set( 0 );
+
+} /* nwipe_gui_init */
+
+void nwipe_gui_free( void )
+{
+    /**
+     * Releases the ncurses gui.
+     *
+     */
+    /* Free ncurses resources. */
+    if( del_panel( footer_panel ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting footer panel failed!." );
+    }
+    if( del_panel( header_panel ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting header panel failed!." );
+    }
+    if( del_panel( main_panel ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting main panel failed!." );
+    }
+    if( del_panel( options_panel ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting options panel failed!." );
+    }
+    if( del_panel( stats_panel ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting stats panel failed!." );
+    }
+    if( delwin( footer_window ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting footer window failed!." );
+    }
+    if( delwin( header_window ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting header window failed!." );
+    }
+    if( delwin( main_window ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting main window failed!." );
+    }
+    if( delwin( options_window ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting options window failed!." );
+    }
+    if( delwin( stats_window ) != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Deleting stats window failed!." );
+    }
+    if( endwin() != OK )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Curses endwin() failed !" );
+    }
+
+} /* nwipe_gui_free */
+
+void nwipe_gui_create_main_window()
+{
+    /* Create the main window. */
+    main_window = newwin( NWIPE_GUI_MAIN_H, NWIPE_GUI_MAIN_W, NWIPE_GUI_MAIN_Y, NWIPE_GUI_MAIN_X );
+    main_panel = new_panel( main_window );
+
+    if( has_colors() )
+    {
+        /* Set the background style. */
+        wbkgdset( main_window, COLOR_PAIR( 1 ) | ' ' );
+
+        /* Apply the color change. */
+        wattron( main_window, COLOR_PAIR( 1 ) );
+
+        /* In tft saver mode we toggle the intensity bit which gives us grey text */
+        if( tft_saver )
+        {
+            wattron( main_window, A_BOLD );
+        }
+        else
+        {
+            wattroff( main_window, A_BOLD );
+        }
+    }
+
+    /* Clear the main window. */
+    werase( main_window );
+
+    /* Add a border. */
+    box( main_window, 0, 0 );
+
+    /* refresh main window */
+    wnoutrefresh( main_window );
+
+} /* nwipe_gui_create_main_window */
+
+void nwipe_gui_create_header_window()
+{
+    char anon_label[] = " (ANONYMIZED)";
+    char bannerplus[80];
+
+    /* Create the header window. */
+    header_window = newwin( NWIPE_GUI_HEADER_H, NWIPE_GUI_HEADER_W, NWIPE_GUI_HEADER_Y, NWIPE_GUI_HEADER_X );
+    header_panel = new_panel( header_window );
+
+    if( has_colors() )
+    {
+        /* Set the background style of the header window. */
+        wbkgdset( header_window, COLOR_PAIR( 4 ) | ' ' );
+
+        if( tft_saver )
+        {
+            wattron( main_window, A_BOLD );
+        }
+    }
+
+    /* Clear the header window. */
+    werase( header_window );
+
+    /* If in anonymized mode modify the title banner to reflect this */
+    strcpy( bannerplus, banner );
+
+    if( nwipe_options.quiet )
+    {
+        strcat( bannerplus, anon_label );
+    }
+
+    /* Print the product banner. */
+    nwipe_gui_title( header_window, bannerplus );
+
+    /* Refresh the header window */
+    wnoutrefresh( header_window );
+
+} /* nwipe_gui_create_header_window */
+
+void nwipe_gui_create_footer_window( const char* footer_text )
+{
+    /* Create the footer window. */
+    footer_window = newwin( NWIPE_GUI_FOOTER_H, NWIPE_GUI_FOOTER_W, NWIPE_GUI_FOOTER_Y, NWIPE_GUI_FOOTER_X );
+    footer_panel = new_panel( footer_window );
+
+    if( has_colors() )
+    {
+        /* Set the background style of the footer window. */
+        wbkgdset( footer_window, COLOR_PAIR( 4 ) | ' ' );
+    }
+
+    /* Erase the footer window. */
+    werase( footer_window );
+
+    /* Add help text to the footer */
+    nwipe_gui_title( footer_window, footer_text );
+
+    /* Refresh the footer window */
+    wnoutrefresh( footer_window );
+
+} /* nwipe_gui_create_footer_window */
+
+void nwipe_gui_amend_footer_window( const char* footer_text )
+{
+    /* Clear the footer window. */
+    werase( footer_window );
+
+    /* Add help text to the footer */
+    nwipe_gui_title( footer_window, footer_text );
+
+    /* Refresh the footer window */
+    wnoutrefresh( footer_window );
+
+} /* nwipe_gui_amend_footer_window */
+
+void nwipe_gui_create_options_window()
+{
+    /* Create the options window. */
+    options_window = newwin( NWIPE_GUI_OPTIONS_H, NWIPE_GUI_OPTIONS_W, NWIPE_GUI_OPTIONS_Y, NWIPE_GUI_OPTIONS_X );
+    options_panel = new_panel( options_window );
+
+    if( has_colors() )
+    {
+        /* Set the background style of the options window. */
+        wbkgdset( options_window, COLOR_PAIR( 1 ) | ' ' );
+
+        /* Apply the color change to the options window. */
+        wattron( options_window, COLOR_PAIR( 1 ) );
+
+        if( tft_saver )
+        {
+            wattron( options_window, A_BOLD );
+        }
+    }
+
+    /* Clear the options window. */
+    werase( options_window );
+
+    /* Add a border. */
+    box( options_window, 0, 0 );
+
+} /* nwipe_gui_create_options_window */
+
+void nwipe_gui_create_stats_window()
+{
+    /* Create the stats window. */
+    stats_window = newwin( NWIPE_GUI_STATS_H, NWIPE_GUI_STATS_W, NWIPE_GUI_STATS_Y, NWIPE_GUI_STATS_X );
+    stats_panel = new_panel( stats_window );
+
+    if( has_colors() )
+    {
+        /* Set the background style of the stats window. */
+        wbkgdset( stats_window, COLOR_PAIR( 1 ) | ' ' );
+
+        /* Apply the color change to the stats window. */
+        wattron( stats_window, COLOR_PAIR( 1 ) );
+
+        if( tft_saver )
+        {
+            wattron( stats_window, A_BOLD );
+        }
+    }
+
+    /* Clear the new window. */
+    werase( stats_window );
+
+    /* Add a border. */
+    box( stats_window, 0, 0 );
+
+    /* Add a title. */
+    nwipe_gui_title( stats_window, stats_title );
+
+    /* Print field labels. */
+    mvwprintw( stats_window, NWIPE_GUI_STATS_RUNTIME_Y, NWIPE_GUI_STATS_RUNTIME_X, "Runtime:       " );
+    mvwprintw( stats_window, NWIPE_GUI_STATS_ETA_Y, NWIPE_GUI_STATS_ETA_X, "Remaining:     " );
+    mvwprintw( stats_window, NWIPE_GUI_STATS_LOAD_Y, NWIPE_GUI_STATS_LOAD_X, "Load Averages: " );
+    mvwprintw( stats_window, NWIPE_GUI_STATS_THROUGHPUT_Y, NWIPE_GUI_STATS_THROUGHPUT_X, "Throughput:    " );
+    mvwprintw( stats_window, NWIPE_GUI_STATS_ERRORS_Y, NWIPE_GUI_STATS_ERRORS_X, "Errors:        " );
+
+} /* nwipe_gui_create_stats_window */
+
+void nwipe_gui_create_all_windows_on_terminal_resize( int force_creation, const char* footer_text )
+{
+    /* Get the terminal size */
+    getmaxyx( stdscr, stdscr_lines, stdscr_cols );
+
+    /* If the user has resized the terminal then recreate the windows and panels */
+    if( stdscr_cols_previous != stdscr_cols || stdscr_lines_previous != stdscr_lines || force_creation == 1 )
+    {
+        /* Save the revised terminal size so we check whether the user has resized next time */
+        stdscr_lines_previous = stdscr_lines;
+        stdscr_cols_previous = stdscr_cols;
+
+        /* Clear the screen. */
+        wclear( stdscr );
+
+        /* Create a new header window and panel due to terminal size having changed */
+        nwipe_gui_create_header_window();
+
+        /* Create a new main window and panel due to terminal size having changed */
+        nwipe_gui_create_main_window();
+
+        /* Create a new footer window and panel due to terminal size having changed */
+        nwipe_gui_create_footer_window( footer_text );
+
+        /* Create a new options window and panel due to terminal size having changed */
+        nwipe_gui_create_options_window();
+
+        /* Create a new stats window and panel due to terminal size having changed */
+        nwipe_gui_create_stats_window();
+
+        /* Update the options window. */
+        nwipe_gui_options();
+
+        update_panels();
+        doupdate();
+    }
+}
+
+void nwipe_gui_select( int count, nwipe_context_t** c )
+{
+    /**
+     * The primary user interface.  Allows the user to
+     * change options and specify the devices to be wiped.
+     *
+     * @parameter  count       The number of contexts in the array.
+     * @parameter  c           An array of device contexts.
+     *
+     * @modifies   c[].select  Sets the select flag according to user input.
+     * @modifies   options     Sets program options according to to user input.
+     *
+     */
+
+    extern int terminate_signal;
+
+    /* Widget labels. */
+    const char* select_title = " Disks and Partitions ";
+
+    /* The number of lines available in the window. */
+    int wlines;
+
+    /* The number of columns available in the window. */
+    int wcols;
+
+    /* The number of selection elements that we can show in the window. */
+    int slots;
+
+    /* The index of the element that is visible in the first slot. */
+    int offset = 0;
+
+    /* The selection focus. */
+    int focus = 0;
+
+    /* A generic loop variable. */
+    int i = 0;
+
+    /* User input buffer. */
+    int keystroke;
+
+    /* The current working line. */
+    int yy;
+
+    /* Flag, Valid key hit = 1, anything else = 0 */
+    int validkeyhit;
+
+    /* Counts number of drives and partitions that have been selected */
+    int number_of_selected_contexts = 0;
+
+    /* Control A toggle status -1=indefined, 0=all drives delected, 1=all drives selected */
+    int select_all_toggle_status = -1;
+
+    /* Get the terminal size */
+    getmaxyx( stdscr, stdscr_lines, stdscr_cols );
+
+    /* Save the terminal size so we check whether the user has resized */
+    stdscr_lines_previous = stdscr_lines;
+    stdscr_cols_previous = stdscr_cols;
+
+    time_t temperature_check_time = time( NULL );
+
+    /* Used in the selection loop to trap a failure of the timeout(), getch() mechanism to block for the designated
+     * period */
+    int iteration_counter;
+
+    /* Used in the selection loop to trap a failure of the timeout(), getch() mechanism to block for the designated
+     * period */
+    int expected_iterations;
+
+    time_t previous_iteration_timestamp;
+
+    do
+    {
+
+        nwipe_gui_create_all_windows_on_terminal_resize( 0, main_window_footer );
+
+        /* There is one slot per line. */
+        getmaxyx( main_window, wlines, wcols );
+
+        /* Less two lines for the box and two lines for padding. */
+        slots = wlines - 4;
+        if( slots < 0 )
+        {
+            slots = 0;
+        }
+
+        /* The code here adjusts the offset value, required when the terminal is resized vertically */
+        if( slots > count )
+        {
+            offset = 0;
+        }
+        else
+        {
+            if( focus >= count )
+            {
+                /* The focus is already at the last element. */
+                focus = count - 1;
+            }
+            if( focus < 0 )
+            {
+                /* The focus is already at the last element. */
+                focus = 0;
+            }
+        }
+
+        if( count >= slots && slots > 0 )
+        {
+            offset = focus + 1 - slots;
+            if( offset < 0 )
+            {
+                offset = 0;
+            }
+        }
+
+        /* Clear the main window, necessary when switching selections such as method etc */
+        werase( main_window );
+
+        /* Refresh main window */
+        wnoutrefresh( main_window );
+
+        /* If the user selected an option the footer text would have changed.
+         * Here we set it back to the main key help text */
+        nwipe_gui_create_footer_window( main_window_footer );
+
+        /* Refresh the stats window */
+        wnoutrefresh( stats_window );
+
+        /* Refresh the options window */
+        wnoutrefresh( options_window );
+
+        /* Update the options window. */
+        nwipe_gui_options();
+
+        /* Initialize the line offset. */
+        yy = 2;
+
+        for( i = 0; i < slots && i < count; i++ )
+        {
+
+            /* Move to the next line. */
+            mvwprintw( main_window, yy++, 1, " " );
+
+            if( i + offset == focus )
+            {
+                if( c[focus]->select == NWIPE_SELECT_TRUE || c[focus]->select == NWIPE_SELECT_FALSE )
+                {
+                    /* Print the 'enabled' cursor. */
+                    waddch( main_window, ACS_RARROW );
+                }
+
+                else
+                {
+                    /* Print the 'disabled' cursor. */
+                    waddch( main_window, ACS_DIAMOND );
+                }
+            }
+
+            else
+            {
+                /* Print whitespace. */
+                waddch( main_window, ' ' );
+            }
+
+            /* In the event for the offset value somehow becoming invalid, this if statement will prevent a segfault
+             * and the else part will log the out of bounds values for debugging */
+            if( i + offset >= 0 && i + offset < count )
+            {
+
+                switch( c[i + offset]->select )
+                {
+                    case NWIPE_SELECT_TRUE:
+
+                        if( nwipe_options.method == &nwipe_verify_zero || nwipe_options.method == &nwipe_verify_one )
+                        {
+                            wprintw( main_window,
+                                     "[vrfy] %s %s [%s] ",
+                                     c[i + offset]->gui_device_name,
+                                     c[i + offset]->device_type_str,
+                                     c[i + offset]->device_size_text );
+                        }
+                        else
+                        {
+                            wprintw( main_window,
+                                     "[wipe] %s %s [%s] ",
+                                     c[i + offset]->gui_device_name,
+                                     c[i + offset]->device_type_str,
+                                     c[i + offset]->device_size_text );
+                        }
+                        break;
+
+                    case NWIPE_SELECT_FALSE:
+                        /* Print an element that is not selected. */
+                        wprintw( main_window,
+                                 "[    ] %s %s [%s] ",
+                                 c[i + offset]->gui_device_name,
+                                 c[i + offset]->device_type_str,
+                                 c[i + offset]->device_size_text );
+                        break;
+
+                    case NWIPE_SELECT_TRUE_PARENT:
+
+                        /* This element will be wiped when its parent is wiped. */
+                        wprintw( main_window,
+                                 "[****] %s %s [%s] ",
+                                 c[i + offset]->gui_device_name,
+                                 c[i + offset]->device_type_str,
+                                 c[i + offset]->device_size_text );
+                        break;
+
+                    case NWIPE_SELECT_FALSE_CHILD:
+
+                        /* We can't wipe this element because it has a child that is being wiped. */
+                        wprintw( main_window,
+                                 "[----] %s %s [%s] ",
+                                 c[i + offset]->gui_device_name,
+                                 c[i + offset]->device_type_str,
+                                 c[i + offset]->device_size_text );
+                        break;
+
+                    case NWIPE_SELECT_DISABLED:
+
+                        /* We don't know how to wipe this device. (Iomega Zip drives.) */
+                        wprintw( main_window, "[????] %s ", "Unrecognized Device" );
+                        break;
+
+                    default:
+
+                        /* TODO: Handle the sanity error. */
+                        break;
+
+                } /* switch select */
+
+                /* Read the drive temperature values */
+                nwipe_update_temperature( c[i + offset] );
+
+                /* print the temperature */
+                wprintw_temperature( c[i + offset] );
+
+                /* print the drive model and serial number */
+                wprintw( main_window, "%s/%s", c[i + offset]->device_model, c[i + offset]->device_serial_no );
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_DEBUG,
+                           "GUI.c,nwipe_gui_select(), scroll, array index out of bounds, i=%u, count=%u, slots=%u, "
+                           "focus=%u, offset=%u",
+                           i,
+                           count,
+                           slots,
+                           focus,
+                           offset );
+            }
+
+        } /* for */
+
+        if( offset > 0 )
+        {
+            mvwprintw( main_window, 1, wcols - 8, " More " );
+            waddch( main_window, ACS_UARROW );
+        }
+
+        if( count - offset > slots )
+        {
+            mvwprintw( main_window, wlines - 2, wcols - 8, " More " );
+            waddch( main_window, ACS_DARROW );
+        }
+
+        /* Draw a border around the menu window. */
+        box( main_window, 0, 0 );
+
+        /* Print a title. */
+        nwipe_gui_title( main_window, select_title );
+
+        /* Refresh the window. */
+        wnoutrefresh( main_window );
+
+        /* Output to physical screen */
+        doupdate();
+
+        /* Initialise the iteration counter */
+        iteration_counter = 0;
+
+        previous_iteration_timestamp = time( NULL );
+
+        /* Calculate Maximum allowed iterations per second */
+        expected_iterations = ( 1000 / GETCH_BLOCK_MS ) * 2;
+
+        do
+        {
+            /* Wait 250ms for input from getch, if nothing getch will then continue,
+             * This is necessary so that the while loop can be exited by the
+             * terminate_signal e.g.. the user pressing control-c to exit.
+             * Do not change this value, a higher value means the keys become
+             * sluggish, any slower and more time is spent unnecessarily looping
+             * which wastes CPU cycles.
+             */
+
+            validkeyhit = 0;
+            timeout( GETCH_BLOCK_MS );  // block getch() for ideally about 250ms.
+            keystroke = getch();  // Get user input.
+            timeout( -1 );  // Switch back to blocking mode.
+
+            /* To avoid 100% CPU usage, check for a runaway condition caused by the "keystroke = getch(); (above), from
+             * immediately returning an error condition. We check for an error condition because getch() returns a ERR
+             * value when the timeout value "timeout( 250 );" expires as well as when a real error occurs. We can't
+             * differentiate from normal operation and a failure of the getch function to block for the specified period
+             * of timeout. So here we check the while loop hasn't exceeded the number of expected iterations per second
+             * ie. a timeout(250) block value of 250ms means we should not see any more than (1000/250) = 4 iterations.
+             * We double this to 8 to allow a little tolerance. Why is this necessary? It's been found that in KDE
+             * konsole and other terminals based on the QT terminal engine exiting the terminal without first existing
+             * nwipe results in nwipe remaining running but detached from any interface which causes getch to fail and
+             * its associated timeout. So the CPU or CPU core rises to 100%. Here we detect that failure and exit nwipe
+             * gracefully with the appropriate error. This does not affect use of tmux for attaching or detaching from a
+             * running nwipe session when sitting at the selection screen. All other terminals correctly terminate nwipe
+             * when the terminal itself is exited.
+             */
+
+            iteration_counter++;
+
+            if( previous_iteration_timestamp == time( NULL ) )
+            {
+                if( iteration_counter > expected_iterations )
+                {
+                    nwipe_log( NWIPE_LOG_ERROR,
+                               "GUI.c,nwipe_gui_select(), loop runaway, did you close the terminal without exiting "
+                               "nwipe? Initiating shutdown now." );
+                    /* Issue signal to nwipe to shutdown immediately but gracefully */
+                    terminate_signal = 1;
+                }
+            }
+            else
+            {
+                /* new second, so reset counter */
+                iteration_counter = 0;
+                previous_iteration_timestamp = time( NULL );
+            }
+
+            /* We don't necessarily use all of these. For future reference these are some CTRL+key values
+             * ^A - 1, ^B - 2, ^D - 4, ^E - 5, ^F - 6, ^G - 7, ^H - 8, ^I - 9, ^K - 11, ^L - 12, ^N - 14,
+             * ^O - 15, ^P - 16, ^R - 18, ^T - 20, ^U - 21, ^V - 22, ^W - 23, ^X - 24, ^Y - 25
+             * Use nwipe_log( NWIPE_LOG_DEBUG, "Key Name: %s - %u", keyname(keystroke),keystroke) to
+             * figure out what code is returned by what ever key combination */
+
+            switch( keystroke )
+            {
+                case KEY_DOWN:
+                case 'j':
+                case 'J':
+
+                    validkeyhit = 1;
+
+                    /* Increment the focus. */
+                    focus += 1;
+
+                    if( focus >= count )
+                    {
+                        /* The focus is already at the last element. */
+                        focus = count - 1;
+                        break;
+                    }
+
+                    if( focus - offset >= slots )
+                    {
+                        /* The next element is offscreen. Scroll down. */
+                        offset += 1;
+                        break;
+                    }
+
+                    break;
+
+                case KEY_UP:
+                case 'k':
+                case 'K':
+
+                    validkeyhit = 1;
+
+                    /* Decrement the focus. */
+                    focus -= 1;
+
+                    if( focus < 0 )
+                    {
+                        /* The focus is already at the last element. */
+                        focus = 0;
+                        break;
+                    }
+
+                    if( focus < offset )
+                    {
+                        /* The next element is offscreen. Scroll up. */
+                        offset -= 1;
+                        break;
+                    }
+
+                    break;
+
+                case KEY_ENTER:
+                case 10:
+                case ' ':
+
+                    validkeyhit = 1;
+
+                    /* TODO: This block should be made into a function. */
+
+                    if( c[focus]->select == NWIPE_SELECT_TRUE )
+                    {
+                        /* Reverse the selection of this element. */
+                        c[focus]->select = NWIPE_SELECT_FALSE;
+
+                        if( c[focus]->device_part == 0 )
+                        {
+                            /* Sub-deselect all partitions and slices within this disk. */
+                            for( i = 0; i < count; i++ )
+                            {
+                                if( c[i]->device_type == c[focus]->device_type
+                                    && c[i]->device_host == c[focus]->device_host
+                                    && c[i]->device_bus == c[focus]->device_bus
+                                    && c[i]->device_target == c[focus]->device_target
+                                    && c[i]->device_lun == c[focus]->device_lun && c[i]->device_part > 0 )
+                                {
+                                    c[i]->select = NWIPE_SELECT_FALSE;
+                                }
+
+                            } /* for all contexts */
+
+                        } /* if sub-deselect */
+
+                        else
+                        {
+                            /* The number of selected partitions or slices within this disk. */
+                            int j = 0;
+
+                            for( i = 0; i < count; i++ )
+                            {
+                                if( c[i]->device_type == c[focus]->device_type
+                                    && c[i]->device_host == c[focus]->device_host
+                                    && c[i]->device_bus == c[focus]->device_bus
+                                    && c[i]->device_target == c[focus]->device_target
+                                    && c[i]->device_lun == c[focus]->device_lun && c[i]->device_part > 0
+                                    && c[i]->select == NWIPE_SELECT_TRUE )
+                                {
+                                    /* Increment the counter. */
+                                    j += 1;
+                                }
+
+                            } /* for all contexts */
+
+                            if( j == 0 )
+                            {
+                                /* Find the parent disk of this partition or slice. */
+                                for( i = 0; i < count; i++ )
+                                {
+                                    if( c[i]->device_type == c[focus]->device_type
+                                        && c[i]->device_host == c[focus]->device_host
+                                        && c[i]->device_bus == c[focus]->device_bus
+                                        && c[i]->device_target == c[focus]->device_target
+                                        && c[i]->device_lun == c[focus]->device_lun && c[i]->device_part == 0 )
+                                    {
+                                        /* Enable the disk element. */
+                                        c[i]->select = NWIPE_SELECT_FALSE;
+                                    }
+
+                                } /* for all contexts */
+
+                            } /* if */
+
+                        } /* else super-enable */
+
+                        break;
+
+                    } /* if NWIPE_SELECT_TRUE */
+
+                    if( c[focus]->select == NWIPE_SELECT_FALSE )
+                    {
+                        /* Reverse the selection. */
+                        c[focus]->select = NWIPE_SELECT_TRUE;
+
+                        if( c[focus]->device_part == 0 )
+                        {
+                            /* Sub-select all partitions and slices within this disk. */
+                            for( i = 0; i < count; i++ )
+                            {
+                                if( c[i]->device_type == c[focus]->device_type
+                                    && c[i]->device_host == c[focus]->device_host
+                                    && c[i]->device_bus == c[focus]->device_bus
+                                    && c[i]->device_target == c[focus]->device_target
+                                    && c[i]->device_lun == c[focus]->device_lun && c[i]->device_part > 0 )
+                                {
+                                    c[i]->select = NWIPE_SELECT_TRUE_PARENT;
+                                }
+
+                            } /* for */
+
+                        } /* if sub-select */
+
+                        else
+                        {
+                            /* ASSERT: ( c[focus]->device_part > 0 ) */
+
+                            /* Super-deselect the disk that contains this device. */
+                            for( i = 0; i < count; i++ )
+                            {
+                                if( c[i]->device_type == c[focus]->device_type
+                                    && c[i]->device_host == c[focus]->device_host
+                                    && c[i]->device_bus == c[focus]->device_bus
+                                    && c[i]->device_target == c[focus]->device_target
+                                    && c[i]->device_lun == c[focus]->device_lun && c[i]->device_part == 0 )
+                                {
+                                    c[i]->select = NWIPE_SELECT_FALSE_CHILD;
+                                }
+                            }
+
+                        } /* else super-deselect */
+
+                        break;
+
+                    } /* if NWIPE_SELECT_FALSE */
+
+                    /* TODO: Explain to the user why they can't change this. */
+                    break;
+
+                case 'm':
+                case 'M':
+
+                    validkeyhit = 1;
+
+                    /*  Run the method dialog. */
+                    nwipe_gui_method();
+                    break;
+
+                case 'p':
+                case 'P':
+
+                    validkeyhit = 1;
+
+                    /* Run the PRNG dialog. */
+                    nwipe_gui_prng();
+
+                    break;
+
+                case 'r':
+                case 'R':
+
+                    validkeyhit = 1;
+
+                    /* Run the rounds dialog. */
+                    nwipe_gui_rounds();
+
+                    break;
+
+                case 'v':
+                case 'V':
+
+                    validkeyhit = 1;
+
+                    /* Run the option dialog. */
+                    nwipe_gui_verify();
+                    break;
+
+                case 'b':
+                case 'B':
+
+                    validkeyhit = 1;
+
+                    if( nwipe_options.method == &nwipe_ops2 )
+                    {
+                        /* Warn the user about that zero blanking with the ops2 method is not allowed */
+                        wattron( footer_window, COLOR_PAIR( 10 ) );
+                        nwipe_gui_amend_footer_window( main_window_footer_warning_no_blanking_with_ops2 );
+                        doupdate();
+                        sleep( 3 );
+                        wattroff( footer_window, COLOR_PAIR( 10 ) );
+
+                        /* After the delay return footer text back to key help */
+                        nwipe_gui_amend_footer_window( main_window_footer );
+                        doupdate();
+
+                        break;
+                    }
+
+                    if( nwipe_options.method == &nwipe_verify_zero || nwipe_options.method == &nwipe_verify_one )
+                    {
+                        /* Warn the user about that zero blanking with the ops2 method is not allowed */
+                        wattron( footer_window, COLOR_PAIR( 10 ) );
+                        nwipe_gui_amend_footer_window( main_window_footer_warning_no_blanking_with_verify_only );
+                        doupdate();
+                        sleep( 3 );
+                        wattroff( footer_window, COLOR_PAIR( 10 ) );
+
+                        /* After the delay return footer text back to key help */
+                        nwipe_gui_amend_footer_window( main_window_footer );
+                        doupdate();
+
+                        break;
+                    }
+
+                    /* Run the noblank dialog. */
+                    nwipe_gui_noblank();
+                    break;
+
+                case 'S':
+
+                    /* User wants to start the wipe */
+                    validkeyhit = 1;
+
+                    /* Have any drives have been selected ? */
+                    number_of_selected_contexts = 0;
+                    for( i = 0; i < count; i++ )
+                    {
+                        if( c[i]->select == NWIPE_SELECT_TRUE )
+                        {
+                            number_of_selected_contexts += 1;
+                        }
+                    }
+
+                    /* if no drives have been selected, print a warning on the footer */
+                    if( number_of_selected_contexts == 0 )
+                    {
+                        wattron( footer_window, COLOR_PAIR( 10 ) );
+                        nwipe_gui_amend_footer_window( main_window_footer_warning_no_drive_selected );
+                        doupdate();
+                        sleep( 3 );
+                        wattroff( footer_window, COLOR_PAIR( 10 ) );
+
+                        /* After the delay return footer text back to key help */
+                        nwipe_gui_amend_footer_window( main_window_footer );
+                        doupdate();
+
+                        /* Remove any repeated S key strokes, without this the gui would hang
+                         * for a period of time, i.e sleep above x number of repeated 's' keystrokes
+                         * which could run into minutes */
+                        do
+                        {
+                            timeout( 250 );  // block getch() for 250ms.
+                            keystroke = getch();  // Get user input.
+                            timeout( -1 );  // Switch back to blocking mode.
+                        } while( keystroke == 'S' );
+
+                        /* Remove the S from keystroke, which allows us to stay within the selection menu loop */
+                        keystroke = 0;
+                    }
+
+                    break;
+
+                case 's':
+
+                    /* user has mistakenly hit the lower case 's' instead of capital 'S' */
+                    validkeyhit = 1;
+
+                    /* Warn the user about their mistake */
+                    wattron( footer_window, COLOR_PAIR( 10 ) );
+                    nwipe_gui_amend_footer_window( main_window_footer_warning_lower_case_s );
+                    doupdate();
+                    sleep( 3 );
+                    wattroff( footer_window, COLOR_PAIR( 10 ) );
+
+                    /* After the delay return footer text back to key help */
+                    nwipe_gui_amend_footer_window( main_window_footer );
+                    doupdate();
+
+                    /* Remove any repeated s key strokes, without this the gui would hang
+                     * for a period of time, i.e sleep above x number of repeated 's' keystrokes
+                     * which could run into minutes */
+                    do
+                    {
+                        timeout( 250 );  // block getch() for 250ms.
+                        keystroke = getch();  // Get user input.
+                        timeout( -1 );  // Switch back to blocking mode.
+                    } while( keystroke == 's' );
+
+                    break;
+
+                case 1:
+
+                    /* Ctrl A - Toggle select/deselect all drives */
+                    validkeyhit = 1;
+
+                    if( select_all_toggle_status == -1 || select_all_toggle_status == 0 )
+                    {
+                        for( i = 0; i < count; i++ )
+                        {
+                            c[i]->select = NWIPE_SELECT_TRUE;
+                        }
+                        select_all_toggle_status = 1;
+                    }
+                    else
+                    {
+                        if( select_all_toggle_status == 1 )
+                        {
+                            for( i = 0; i < count; i++ )
+                            {
+                                c[i]->select = NWIPE_SELECT_FALSE;
+                            }
+                            select_all_toggle_status = 0;
+                        }
+                        else
+                        {
+                            nwipe_log(
+                                NWIPE_LOG_ERROR,
+                                "gui.c:nwipe_gui_select(), Invalid value in variable select_all_toggle_status = %d",
+                                select_all_toggle_status );
+                        }
+                    }
+
+                    break;
+
+            } /* keystroke switch */
+
+            /* Check the terminal size, if the user has changed it the while loop checks for
+             * this change and exits the valid key hit loop so the windows can be updated */
+            getmaxyx( stdscr, stdscr_lines, stdscr_cols );
+
+            /* Update the selection window every 60 seconds specifically so that the drive temperatures are updated */
+            if( time( NULL ) > ( temperature_check_time + 60 ) )
+            {
+                temperature_check_time = time( NULL );
+                validkeyhit = 1;
+            }
+
+        } /* key hit loop */
+        while( validkeyhit == 0 && terminate_signal != 1 && stdscr_cols_previous == stdscr_cols
+               && stdscr_lines_previous == stdscr_lines );
+
+    } while( keystroke != 'S' && terminate_signal != 1 );
+
+    if( keystroke == 'S' )
+    {
+        /* If user has pressed S to start wipe change status line */
+        werase( footer_window );
+        nwipe_gui_title( footer_window, end_wipe_footer );
+        wnoutrefresh( footer_window );
+    }
+
+} /* nwipe_gui_select */
+
+void nwipe_gui_options( void )
+{
+    /**
+     * Updates the options window.
+     *
+     * @modifies  options_window
+     *
+     */
+
+    /* Erase the window. */
+    werase( options_window );
+
+    mvwprintw(
+        options_window, NWIPE_GUI_OPTIONS_ENTROPY_Y, NWIPE_GUI_OPTIONS_ENTROPY_X, "Entropy: Linux Kernel (urandom)" );
+
+    mvwprintw(
+        options_window, NWIPE_GUI_OPTIONS_PRNG_Y, NWIPE_GUI_OPTIONS_PRNG_X, "PRNG:    %s", nwipe_options.prng->label );
+
+    mvwprintw( options_window,
+               NWIPE_GUI_OPTIONS_METHOD_Y,
+               NWIPE_GUI_OPTIONS_METHOD_X,
+               "Method:  %s",
+               nwipe_method_label( nwipe_options.method ) );
+
+    mvwprintw( options_window, NWIPE_GUI_OPTIONS_VERIFY_Y, NWIPE_GUI_OPTIONS_VERIFY_X, "Verify:  " );
+
+    switch( nwipe_options.verify )
+    {
+        case NWIPE_VERIFY_NONE:
+            wprintw( options_window, "Off" );
+            break;
+
+        case NWIPE_VERIFY_LAST:
+            wprintw( options_window, "Last Pass" );
+            break;
+
+        case NWIPE_VERIFY_ALL:
+            wprintw( options_window, "All Passes" );
+            break;
+
+        default:
+            wprintw( options_window, "Unknown %i", nwipe_options.verify );
+
+    } /* switch verify */
+
+    mvwprintw( options_window, NWIPE_GUI_OPTIONS_ROUNDS_Y, NWIPE_GUI_OPTIONS_ROUNDS_X, "Rounds:  " );
+
+    /* Disable blanking for ops2 and verify methods */
+    if( nwipe_options.method == &nwipe_ops2 || nwipe_options.method == &nwipe_verify_zero
+        || nwipe_options.method == &nwipe_verify_one )
+    {
+        nwipe_options.noblank = 1;
+    }
+
+    if( nwipe_options.noblank )
+    {
+        wprintw( options_window, "%i (no final blanking pass)", nwipe_options.rounds );
+    }
+    else
+    {
+        wprintw( options_window, "%i (plus blanking pass)", nwipe_options.rounds );
+    }
+
+    /* Add a border. */
+    box( options_window, 0, 0 );
+
+    /* Add a title. */
+    nwipe_gui_title( options_window, options_title );
+
+    /* Refresh the window. */
+    // wrefresh( options_window );
+    wnoutrefresh( options_window );
+
+} /* nwipe_gui_options */
+
+void nwipe_gui_rounds( void )
+{
+    /**
+     * Allows the user to change the rounds option.
+     *
+     * @modifies  nwipe_options.rounds
+     * @modifies  main_window
+     *
+     */
+
+    /* Set the initial focus. */
+    int focus = nwipe_options.rounds;
+
+    /* The first tabstop. */
+    const int tab1 = 2;
+
+    /* The current working row. */
+    int yy;
+
+    /* Input buffer. */
+    int keystroke;
+
+    extern int terminate_signal;
+
+    /* Update the footer window. */
+    werase( footer_window );
+    nwipe_gui_title( footer_window, rounds_footer );
+    wrefresh( footer_window );
+
+    do
+    {
+        /* Erase the main window. */
+        werase( main_window );
+
+        nwipe_gui_create_all_windows_on_terminal_resize( 0, selection_footer );
+
+        /* Add a border. */
+        box( main_window, 0, 0 );
+
+        /* Add a title. */
+        nwipe_gui_title( main_window, " Rounds " );
+
+        /* Initialize the working row. */
+        yy = 4;
+
+        mvwprintw( main_window, yy++, tab1, "This is the number of times to run the wipe method on each device." );
+        yy++;
+
+        if( focus > 0 )
+        {
+            /* Print this line last so that the cursor is in the right place. */
+            mvwprintw( main_window, 2, tab1, "> %i", focus );
+        }
+        else
+        {
+            mvwprintw( main_window, yy++, tab1, "The number of rounds must be a non-negative integer." );
+
+            /* Print this line last so that the cursor is in the right place. */
+            mvwprintw( main_window, 2, tab1, "> " );
+        }
+
+        /* Reveal the cursor. */
+        curs_set( 1 );
+
+        /* Refresh the window. */
+        wrefresh( main_window );
+
+        /* Wait 250ms for input from getch, if nothing getch will then continue,
+         * This is necessary so that the while loop can be exited by the
+         * terminate_signal e.g.. the user pressing control-c to exit.
+         * Do not change this value, a higher value means the keys become
+         * sluggish, any slower and more time is spent unnecessarily looping
+         * which wastes CPU cycles.
+         */
+        timeout( 250 );  // block getch() for 250ms.
+        keystroke = getch();  // Get a keystroke.
+        timeout( -1 );  // Switch back to blocking mode.
+
+        switch( keystroke )
+        {
+            case '0':
+            case '1':
+            case '2':
+            case '3':
+            case '4':
+            case '5':
+            case '6':
+            case '7':
+            case '8':
+            case '9':
+
+                if( focus < 100000000 )
+                {
+                    /* Left shift, base ten. */
+                    focus *= 10;
+
+                    /* This assumes ASCII input, where the zero character is 0x30. */
+                    focus += keystroke - 48;
+                }
+
+                break;
+
+            /* Escape key. */
+            case 27:
+                return;
+
+            case KEY_BACKSPACE:
+            case KEY_LEFT:
+            case 127:
+
+                /* Right shift, base ten. */
+                focus /= 10;
+
+                break;
+
+        } /* switch keystroke */
+
+        /* Hide the cursor. */
+        curs_set( 0 );
+
+    } while( keystroke != 10 && terminate_signal != 1 );
+
+    if( focus > 0 )
+    {
+        /* Set the number of rounds. */
+        nwipe_options.rounds = focus;
+    }
+
+} /* nwipe_guid_rounds */
+
+void nwipe_gui_prng( void )
+{
+    /**
+     * Allows the user to change the PRNG.
+     *
+     * @modifies  nwipe_options.prng
+     * @modifies  main_window
+     *
+     */
+
+    extern nwipe_prng_t nwipe_twister;
+    extern nwipe_prng_t nwipe_isaac;
+    extern nwipe_prng_t nwipe_isaac64;
+    extern int terminate_signal;
+
+    /* The number of implemented PRNGs. */
+    const int count = 3;
+
+    /* The first tabstop. */
+    const int tab1 = 2;
+
+    /* The second tabstop. */
+    const int tab2 = 30;
+
+    /* Set the initial focus. */
+    int focus = 0;
+
+    /* The current working row. */
+    int yy;
+
+    /* Input buffer. */
+    int keystroke;
+
+    /* Update the footer window. */
+    werase( footer_window );
+    nwipe_gui_title( footer_window, selection_footer );
+    wrefresh( footer_window );
+
+    if( nwipe_options.prng == &nwipe_twister )
+    {
+        focus = 0;
+    }
+    if( nwipe_options.prng == &nwipe_isaac )
+    {
+        focus = 1;
+    }
+    if( nwipe_options.prng == &nwipe_isaac64 )
+    {
+        focus = 2;
+    }
+
+    do
+    {
+        /* Clear the main window. */
+        werase( main_window );
+
+        nwipe_gui_create_all_windows_on_terminal_resize( 0, selection_footer );
+
+        /* Initialize the working row. */
+        yy = 3;
+
+        /* Print the options. */
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_twister.label );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_isaac.label );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_isaac64.label );
+        yy++;
+
+        /* Print the cursor. */
+        mvwaddch( main_window, 3 + focus, tab1, ACS_RARROW );
+
+        switch( focus )
+        {
+            case 0:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "The Mersenne Twister, by Makoto Matsumoto and Takuji Nishimura, is a        " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "generalized feedback shift register PRNG that is uniform and                " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "equidistributed in 623-dimensions with a proven period of 2^19937-1.        " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "This implementation passes the Marsaglia Diehard test suite.                " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                break;
+
+            case 1:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "ISAAC, by Bob Jenkins, is a PRNG derived from RC4 with a minimum period of  " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "2^40 and an expected period of 2^8295.  It is difficult to recover the      " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "initial PRNG state by cryptanalysis of the ISAAC stream.                    " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Performs best on a 32-bit CPU. Use ISAAC-64 if this system has a 64-bit CPU." );
+                break;
+
+            case 2:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "ISAAC-64, by Bob Jenkins, is like 32-bit ISAAC, but with a minimum period of" );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "2^77 and an expected period of 2^16583. It is difficult to recover the      " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "initial PRNG state by cryptanalysis of the ISAAC-64 stream.                 " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Performs best on a 64-bit CPU. Use ISAAC if this system has a 32-bit CPU.   " );
+                break;
+
+        } /* switch */
+
+        /* Add a border. */
+        box( main_window, 0, 0 );
+
+        /* Add a title. */
+        nwipe_gui_title( main_window, " Pseudo Random Number Generator " );
+
+        /* Refresh the window. */
+        wrefresh( main_window );
+
+        /* Wait 250ms for input from getch, if nothing getch will then continue,
+         * This is necessary so that the while loop can be exited by the
+         * terminate_signal e.g.. the user pressing control-c to exit.
+         * Do not change this value, a higher value means the keys become
+         * sluggish, any slower and more time is spent unnecessarily looping
+         * which wastes CPU cycles.
+         */
+        timeout( 250 );  // block getch() for 250ms.
+        keystroke = getch();  // Get a keystroke.
+        timeout( -1 );  // Switch back to blocking mode.
+
+        switch( keystroke )
+        {
+            case KEY_DOWN:
+            case 'j':
+            case 'J':
+
+                if( focus < count - 1 )
+                {
+                    focus += 1;
+                }
+                break;
+
+            case KEY_UP:
+            case 'k':
+            case 'K':
+
+                if( focus > 0 )
+                {
+                    focus -= 1;
+                }
+                break;
+
+            case KEY_ENTER:
+            case ' ':
+            case 10:
+
+                if( focus == 0 )
+                {
+                    nwipe_options.prng = &nwipe_twister;
+                }
+                if( focus == 1 )
+                {
+                    nwipe_options.prng = &nwipe_isaac;
+                }
+                if( focus == 2 )
+                {
+                    nwipe_options.prng = &nwipe_isaac64;
+                }
+                return;
+
+            case KEY_BACKSPACE:
+            case KEY_BREAK:
+
+                return;
+
+        } /* switch */
+
+    } while( terminate_signal != 1 );
+
+} /* nwipe_gui_prng */
+
+void nwipe_gui_verify( void )
+{
+    /**
+     * Allows the user to change the verification option.
+     *
+     * @modifies  nwipe_options.verify
+     * @modifies  main_window
+     *
+     */
+
+    extern int terminate_signal;
+
+    /* The number of definitions in the nwipe_verify_t enumeration. */
+    const int count = 3;
+
+    /* The first tabstop. */
+    const int tab1 = 2;
+
+    /* The second tabstop. */
+    const int tab2 = 30;
+
+    /* Set the initial focus. */
+    int focus = nwipe_options.verify;
+
+    /* The current working row. */
+    int yy;
+
+    /* Input buffer. */
+    int keystroke;
+
+    /* Update the footer window. */
+    werase( footer_window );
+    nwipe_gui_title( footer_window, selection_footer );
+    wrefresh( footer_window );
+
+    do
+    {
+        nwipe_gui_create_all_windows_on_terminal_resize( 0, selection_footer );
+
+        /* Clear the main window. */
+        werase( main_window );
+
+        /* Initialize the working row. */
+        yy = 2;
+
+        /* Print the options. */
+        mvwprintw( main_window, yy++, tab1, "  Verification Off  " );
+        mvwprintw( main_window, yy++, tab1, "  Verify Last Pass  " );
+        mvwprintw( main_window, yy++, tab1, "  Verify All Passes " );
+        mvwprintw( main_window, yy++, tab1, "                    " );
+
+        /* Print the cursor. */
+        mvwaddch( main_window, 2 + focus, tab1, ACS_RARROW );
+
+        switch( focus )
+        {
+            case 0:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Do not verify passes. The wipe will be a write-only operation.              " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                break;
+
+            case 1:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Check whether the device is actually empty after the last pass fills the    " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "device with zeros.                                                          " );
+                break;
+
+            case 2:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "After every pass, read back the pattern and check whether it is correct.    " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "This program writes the entire length of the device before it reads back    " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "for verification, even for random pattern passes, to better ensure that     " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "hardware caches are actually flushed.                                       " );
+                break;
+
+        } /* switch */
+
+        /* Add a border. */
+        box( main_window, 0, 0 );
+
+        /* Add a title. */
+        nwipe_gui_title( main_window, " Verification Mode " );
+
+        /* Refresh the window. */
+        wrefresh( main_window );
+
+        /* Wait 250ms for input from getch, if nothing getch will then continue,
+         * This is necessary so that the while loop can be exited by the
+         * terminate_signal e.g.. the user pressing control-c to exit.
+         * Do not change this value, a higher value means the keys become
+         * sluggish, any slower and more time is spent unnecessarily looping
+         * which wastes CPU cycles.
+         */
+        timeout( 250 );  // block getch() for 250ms.
+        keystroke = getch();  // Get a keystroke.
+        timeout( -1 );  // Switch back to blocking mode.
+
+        switch( keystroke )
+        {
+            case KEY_DOWN:
+            case 'j':
+            case 'J':
+
+                if( focus < count - 1 )
+                {
+                    focus += 1;
+                }
+                break;
+
+            case KEY_UP:
+            case 'k':
+            case 'K':
+
+                if( focus > 0 )
+                {
+                    focus -= 1;
+                }
+                break;
+
+            case KEY_ENTER:
+            case ' ':
+            case 10:
+
+                if( focus >= 0 && focus < count )
+                {
+                    nwipe_options.verify = focus;
+                }
+                return;
+
+            case KEY_BACKSPACE:
+            case KEY_BREAK:
+
+                return;
+
+        } /* switch */
+
+    } while( terminate_signal != 1 );
+
+} /* nwipe_gui_verify */
+
+void nwipe_gui_noblank( void )
+{
+    /**
+     * Allows the user to change the verification option.
+     *
+     * @modifies  nwipe_options.noblank
+     * @modifies  main_window
+     *
+     */
+
+    extern int terminate_signal;
+
+    /* The number of options available. */
+    const int count = 2;
+
+    /* The first tabstop. */
+    const int tab1 = 2;
+
+    /* The second tabstop. */
+    const int tab2 = 40;
+
+    /* Set the initial focus. */
+    int focus = nwipe_options.noblank;
+
+    /* The current working row. */
+    int yy;
+
+    /* Input buffer. */
+    int keystroke;
+
+    /* Update the footer window. */
+    werase( footer_window );
+    nwipe_gui_title( footer_window, selection_footer );
+    wrefresh( footer_window );
+
+    do
+    {
+        nwipe_gui_create_all_windows_on_terminal_resize( 0, selection_footer );
+
+        /* Clear the main window. */
+        werase( main_window );
+
+        /* Initialize the working row. */
+        yy = 2;
+
+        /* Print the options. */
+        mvwprintw( main_window, yy++, tab1, "  Perform a final blanking pass       " );
+        mvwprintw( main_window, yy++, tab1, "  Do not perform final blanking pass  " );
+        mvwprintw( main_window, yy++, tab1, "                                      " );
+
+        /* Print the cursor. */
+        mvwaddch( main_window, 2 + focus, tab1, ACS_RARROW );
+
+        switch( focus )
+        {
+            case 0:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Perform a final blanking pass after the wipe, leaving disk with only zeros. " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Note that the RCMP TSSIT OPS-II method never blanks the device regardless   " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "of this setting.                                                            " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                break;
+
+            case 1:
+
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Do not perform a final blanking pass. Leave data as per final wiping pass.  " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "Note that the RCMP TSSIT OPS-II method never blanks the device regardless   " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "of this setting.                                                            " );
+                mvwprintw( main_window,
+                           yy++,
+                           tab1,
+                           "                                                                            " );
+                break;
+
+        } /* switch */
+
+        /* Add a border. */
+        box( main_window, 0, 0 );
+
+        /* Add a title. */
+        nwipe_gui_title( main_window, " Final Blanking Pass " );
+
+        /* Refresh the window. */
+        wrefresh( main_window );
+
+        /* Wait 250ms for input from getch, if nothing getch will then continue,
+         * This is necessary so that the while loop can be exited by the
+         * terminate_signal e.g.. the user pressing control-c to exit.
+         * Do not change this value, a higher value means the keys become
+         * sluggish, any slower and more time is spent unnecessarily looping
+         * which wastes CPU cycles.
+         */
+        timeout( 250 );  // block getch() for 250ms.
+        keystroke = getch();  // Get a keystroke.
+        timeout( -1 );  // Switch back to blocking mode.
+
+        switch( keystroke )
+        {
+            case KEY_DOWN:
+            case 'j':
+            case 'J':
+
+                if( focus < count - 1 )
+                {
+                    focus += 1;
+                }
+                break;
+
+            case KEY_UP:
+            case 'k':
+            case 'K':
+
+                if( focus > 0 )
+                {
+                    focus -= 1;
+                }
+                break;
+
+            case KEY_ENTER:
+            case ' ':
+            case 10:
+
+                if( focus >= 0 && focus < count )
+                {
+                    nwipe_options.noblank = focus;
+                }
+                return;
+
+            case KEY_BACKSPACE:
+            case KEY_BREAK:
+
+                return;
+
+        } /* switch */
+
+    }
+
+    while( terminate_signal != 1 );
+} /* nwipe_gui_noblank */
+
+void nwipe_gui_method( void )
+{
+    /**
+     * Allows the user to change the wipe method.
+     *
+     * @modifies  nwipe_options.method
+     * @modifies  main_window
+     *
+     */
+
+    extern int terminate_signal;
+
+    /* The number of implemented methods. */
+    const int count = 10;
+
+    /* The first tabstop. */
+    const int tab1 = 2;
+
+    /* The second tabstop. */
+    const int tab2 = 30;
+
+    /* The currently selected method. */
+    int focus = 0;
+
+    /* The current working row. */
+    int yy;
+
+    /* Input buffer. */
+    int keystroke;
+
+    /* Update the footer window. */
+    werase( footer_window );
+    nwipe_gui_title( footer_window, selection_footer );
+    wrefresh( footer_window );
+
+    if( nwipe_options.method == &nwipe_zero )
+    {
+        focus = 0;
+    }
+    if( nwipe_options.method == &nwipe_one )
+    {
+        focus = 1;
+    }
+    if( nwipe_options.method == &nwipe_ops2 )
+    {
+        focus = 2;
+    }
+    if( nwipe_options.method == &nwipe_dodshort )
+    {
+        focus = 3;
+    }
+    if( nwipe_options.method == &nwipe_dod522022m )
+    {
+        focus = 4;
+    }
+    if( nwipe_options.method == &nwipe_gutmann )
+    {
+        focus = 5;
+    }
+    if( nwipe_options.method == &nwipe_random )
+    {
+        focus = 6;
+    }
+    if( nwipe_options.method == &nwipe_verify_zero )
+    {
+        focus = 7;
+    }
+    if( nwipe_options.method == &nwipe_verify_one )
+    {
+        focus = 8;
+    }
+    if( nwipe_options.method == &nwipe_is5enh )
+    {
+        focus = 9;
+    }
+
+    do
+    {
+        /* Clear the main window. */
+        werase( main_window );
+
+        nwipe_gui_create_all_windows_on_terminal_resize( 0, selection_footer );
+
+        /* Initialize the working row. */
+        yy = 2;
+
+        /* Print the options. */
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_zero ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_one ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_ops2 ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_dodshort ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_dod522022m ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_gutmann ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_random ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_verify_zero ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_verify_one ) );
+        mvwprintw( main_window, yy++, tab1, "  %s", nwipe_method_label( &nwipe_is5enh ) );
+        mvwprintw( main_window, yy++, tab1, "                                             " );
+
+        /* Print the cursor. */
+        mvwaddch( main_window, 2 + focus, tab1, ACS_RARROW );
+
+        switch( focus )
+        {
+            case 0:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: high (1 pass)" );
+
+                mvwprintw( main_window, 4, tab2, "This method fills the device with zeros. Note    " );
+                mvwprintw( main_window, 5, tab2, "that the rounds option does not apply to this    " );
+                mvwprintw( main_window, 6, tab2, "method. This method always runs one round.       " );
+                mvwprintw( main_window, 7, tab2, "                                                 " );
+                mvwprintw( main_window, 8, tab2, "There is no publicly available evidence that   " );
+                mvwprintw( main_window, 9, tab2, "data can be recovered from a modern traditional  " );
+                mvwprintw( main_window, 10, tab2, "hard drive (HDD) that has been zero wiped,       " );
+                mvwprintw( main_window, 11, tab2, "however a wipe that includes a prng may be       " );
+                mvwprintw( main_window, 12, tab2, "preferable.                                      " );
+                break;
+
+            case 1:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: high (1 pass)" );
+
+                mvwprintw( main_window, 4, tab2, "This method fills the device with ones. Note that" );
+                mvwprintw( main_window, 5, tab2, "the rounds option does not apply to this method. " );
+                mvwprintw( main_window, 6, tab2, "This method always runs one round.               " );
+                mvwprintw( main_window, 7, tab2, "                                                 " );
+                mvwprintw( main_window, 8, tab2, "This method might be used when wiping a solid    " );
+                mvwprintw( main_window, 9, tab2, "state drive if an additional level of security is" );
+                mvwprintw( main_window, 10, tab2, "required beyond using the drives internal secure " );
+                mvwprintw( main_window, 11, tab2, "erase features. Alternatively PRNG may be        " );
+                mvwprintw( main_window, 12, tab2, "preferable.                                      " );
+                break;
+
+            case 2:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: higher (8 passes)" );
+
+                mvwprintw( main_window, 4, tab2, "The Royal Canadian Mounted Police Technical      " );
+                mvwprintw( main_window, 5, tab2, "Security Standard for Information Technology.    " );
+                mvwprintw( main_window, 6, tab2, "Appendix OPS-II: Media Sanitization.             " );
+                mvwprintw( main_window, 7, tab2, "                                                 " );
+                mvwprintw( main_window, 8, tab2, "This implementation, with regards to paragraph 2 " );
+                mvwprintw( main_window, 9, tab2, "section A of the standard, uses a pattern that is" );
+                mvwprintw( main_window, 10, tab2, "one random byte and that is changed each round.  " );
+                break;
+
+            case 3:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: higher (3 passes)" );
+
+                mvwprintw( main_window, 4, tab2, "The US Department of Defense 5220.22-M short wipe" );
+                mvwprintw( main_window, 5, tab2, "This method is composed of passes 1, 2 & 7 from  " );
+                mvwprintw( main_window, 6, tab2, "the standard DoD 5220.22-M wipe.                 " );
+                mvwprintw( main_window, 7, tab2, "                                                 " );
+                mvwprintw( main_window, 8, tab2, "Pass 1: A random character                       " );
+                mvwprintw( main_window, 9, tab2, "Pass 2: The bitwise complement of pass 1.        " );
+                mvwprintw( main_window, 10, tab2, "Pass 3: A random number generated data stream    " );
+                break;
+
+            case 4:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: higher (7 passes)" );
+
+                mvwprintw( main_window, 3, tab2, "The American Department of Defense 5220.22-M     " );
+                mvwprintw( main_window, 4, tab2, "standard wipe.                                   " );
+                mvwprintw( main_window, 5, tab2, "                                                 " );
+                mvwprintw( main_window, 6, tab2, "Pass 1: A Random character                       " );
+                mvwprintw( main_window, 7, tab2, "Pass 2: The bitwise complement of pass 1         " );
+                mvwprintw( main_window, 8, tab2, "Pass 3: A random number generated data stream    " );
+                mvwprintw( main_window, 9, tab2, "Pass 4: A Random character                       " );
+                mvwprintw( main_window, 10, tab2, "Pass 5: A Random character                       " );
+                mvwprintw( main_window, 11, tab2, "Pass 6: The bitwise complement of pass 5         " );
+                mvwprintw( main_window, 12, tab2, "Pass 7: A random number generated data stream    " );
+                break;
+
+            case 5:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: Paranoid ! (35 passes)           " );
+                mvwprintw( main_window, 3, tab2, "Don't waste your time with this on a modern drive" );
+
+                mvwprintw( main_window, 5, tab2, "This is the method described by Peter Gutmann in " );
+                mvwprintw( main_window, 6, tab2, "the paper entitled \"Secure Deletion of Data from" );
+                mvwprintw( main_window, 7, tab2, "Magnetic and Solid-State Memory\", however not   " );
+                mvwprintw( main_window, 8, tab2, "relevant in regards to modern hard disk drives.  " );
+                break;
+
+            case 6:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: Depends on Rounds" );
+
+                mvwprintw( main_window, 4, tab2, "This method fills the device with a stream from  " );
+                mvwprintw( main_window, 5, tab2, "the PRNG. It is probably the best method to use  " );
+                mvwprintw( main_window, 6, tab2, "on modern hard disk drives due to variation in   " );
+                mvwprintw( main_window, 7, tab2, "encoding methods.                                " );
+                mvwprintw( main_window, 8, tab2, "                                                 " );
+                mvwprintw( main_window, 9, tab2, "This method has a high security level with 1     " );
+                mvwprintw( main_window, 10, tab2, "round and an increasingly higher security level " );
+                mvwprintw( main_window, 11, tab2, "as rounds are increased." );
+                break;
+
+            case 7:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: Not applicable" );
+
+                mvwprintw( main_window, 4, tab2, "This method only reads the device and checks     " );
+                mvwprintw( main_window, 5, tab2, "that it is all zero.                             " );
+
+                break;
+
+            case 8:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: Not applicable" );
+
+                mvwprintw( main_window, 4, tab2, "This method only reads the device and checks     " );
+                mvwprintw( main_window, 5, tab2, "that it is all ones (0xFF)." );
+
+                break;
+
+            case 9:
+
+                mvwprintw( main_window, 2, tab2, "Security Level: higher (3 passes)" );
+
+                mvwprintw( main_window, 4, tab2, "HMG IA/IS 5 (Infosec Standard 5): Secure         " );
+                mvwprintw( main_window, 5, tab2, "Sanitisation of Protectively Marked Information  " );
+                mvwprintw( main_window, 6, tab2, "or Sensitive Information                         " );
+                mvwprintw( main_window, 7, tab2, "                                                 " );
+                mvwprintw( main_window, 8, tab2, "This method fills the device with 0s, then with  " );
+                mvwprintw( main_window, 9, tab2, "1s, then with a PRNG stream, then reads the      " );
+                mvwprintw( main_window, 10, tab2, "device to verify the PRNG stream was             " );
+                mvwprintw( main_window, 11, tab2, "successfully written.                            " );
+                break;
+
+        } /* switch */
+
+        /* Add a border. */
+        box( main_window, 0, 0 );
+
+        /* Add a title. */
+        nwipe_gui_title( main_window, " Wipe Method " );
+
+        /* Refresh the window. */
+        wrefresh( main_window );
+
+        /* Wait 250ms for input from getch, if nothing getch will then continue,
+         * This is necessary so that the while loop can be exited by the
+         * terminate_signal e.g.. the user pressing control-c to exit.
+         * Do not change this value, a higher value means the keys become
+         * sluggish, any slower and more time is spent unnecessarily looping
+         * which wastes CPU cycles.
+         */
+        timeout( 250 ); /* block getch() for 250ms */
+        keystroke = getch(); /* Get a keystroke. */
+        timeout( -1 ); /* Switch back to blocking mode */
+
+        switch( keystroke )
+        {
+            case KEY_DOWN:
+            case 'j':
+            case 'J':
+
+                if( focus < count - 1 )
+                {
+                    focus += 1;
+                }
+                break;
+
+            case KEY_UP:
+            case 'k':
+            case 'K':
+
+                if( focus > 0 )
+                {
+                    focus -= 1;
+                }
+                break;
+
+            case KEY_BACKSPACE:
+            case KEY_BREAK:
+
+                return;
+
+        } /* switch */
+
+    } while( keystroke != KEY_ENTER && keystroke != ' ' && keystroke != 10 && terminate_signal != 1 );
+
+    switch( focus )
+    {
+        case 0:
+            nwipe_options.method = &nwipe_zero;
+            break;
+
+        case 1:
+            nwipe_options.method = &nwipe_one;
+            break;
+
+        case 2:
+            nwipe_options.method = &nwipe_ops2;
+            break;
+
+        case 3:
+            nwipe_options.method = &nwipe_dodshort;
+            break;
+
+        case 4:
+            nwipe_options.method = &nwipe_dod522022m;
+            break;
+
+        case 5:
+            nwipe_options.method = &nwipe_gutmann;
+            break;
+
+        case 6:
+            nwipe_options.method = &nwipe_random;
+            break;
+
+        case 7:
+            nwipe_options.method = &nwipe_verify_zero;
+            break;
+
+        case 8:
+            nwipe_options.method = &nwipe_verify_one;
+            break;
+
+        case 9:
+            nwipe_options.method = &nwipe_is5enh;
+            break;
+    }
+
+} /* nwipe_gui_method */
+
+void nwipe_gui_load( void )
+{
+    /**
+     * Prints the system load average to the statistics window.
+     *
+     * @modifies stat_window      Prints the system load average to the statistics window.
+     *
+     */
+
+    /* A file handle for the stat file. */
+    FILE* nwipe_fp;
+
+    /* The one, five, and fifteen minute load averages. */
+    float load_01;
+    float load_05;
+    float load_15;
+
+    /* Open the loadavg file. */
+    nwipe_fp = fopen( NWIPE_KNOB_LOADAVG, "r" );
+
+    /* Print the label. */
+    mvwprintw( stats_window, NWIPE_GUI_STATS_LOAD_Y, NWIPE_GUI_STATS_LOAD_X, "Load Averages:" );
+
+    if( nwipe_fp )
+    {
+        /* The load averages are the first three numbers in the file. */
+        if( 3 == fscanf( nwipe_fp, "%f %f %f", &load_01, &load_05, &load_15 ) )
+        {
+            /* Print the load average. */
+            mvwprintw( stats_window,
+                       NWIPE_GUI_STATS_LOAD_Y,
+                       NWIPE_GUI_STATS_TAB,
+                       "%04.2f %04.2f %04.2f",
+                       load_01,
+                       load_05,
+                       load_15 );
+        }
+        else
+        {
+            /* Print an error. */
+            mvwprintw( stats_window, NWIPE_GUI_STATS_LOAD_Y, NWIPE_GUI_STATS_TAB, "(fscanf error %i)", errno );
+        }
+
+        /* Close the loadavg file. */
+        fclose( nwipe_fp );
+    }
+    else
+    {
+        mvwprintw( stats_window, NWIPE_GUI_STATS_LOAD_Y, NWIPE_GUI_STATS_TAB, "(fopen error %i)", errno );
+    }
+
+} /* nwipe_gui_load */
+
+void* nwipe_gui_status( void* ptr )
+{
+    /**
+     * Shows runtime statistics and overall progress.
+     *
+     * @parameter count           The number of contexts in the array.
+     * @parameter c               An array of device contexts.
+     *
+     * @modifies  main_window     Prints information into the main window.
+     * @modifies  c[].throughput  Updates the i/o throughput value.
+     *
+     */
+
+    extern int terminate_signal;
+
+    nwipe_thread_data_ptr_t* nwipe_thread_data_ptr;
+    nwipe_thread_data_ptr = (nwipe_thread_data_ptr_t*) ptr;
+
+    nwipe_context_t** c;
+    nwipe_misc_thread_data_t* nwipe_misc_thread_data;
+    int count;
+
+    c = nwipe_thread_data_ptr->c;
+    nwipe_misc_thread_data = nwipe_thread_data_ptr->nwipe_misc_thread_data;
+    count = nwipe_misc_thread_data->nwipe_selected;
+
+    char nomenclature_result_str[NOMENCLATURE_RESULT_STR_SIZE]; /* temporary usage */
+
+    /* Spinner character */
+    char spinner_string[2];
+
+    /* We count time from when this function is first called. */
+    static time_t nwipe_time_start = 0;
+
+    /* Whether the screen has been blanked by the user. */
+    static int nwipe_gui_blank = 0;
+
+    /* The current time. */
+    time_t nwipe_time_now;
+
+    /* The time when all wipes ended */
+    time_t nwipe_time_stopped;
+
+    /* The index of the element that is visible in the first slot. */
+    static int offset;
+
+    /* The number of elements that we can show in the window. */
+    int slots;
+
+    /* Window dimensions. */
+    int wlines;
+    int wcols;
+
+    /* Generic loop variable. */
+    int i;
+
+    /* The current working line in the main window. */
+    int yy;
+
+    /* User input buffer. */
+    int keystroke;
+
+    /* controls main while loop */
+    int loop_control;
+
+    /* The combined througput of all processes. */
+    nwipe_misc_thread_data->throughput = 0;
+
+    /* The estimated runtime of the slowest device. */
+    nwipe_misc_thread_data->maxeta = 0;
+
+    /* The combined number of errors of all processes. */
+    nwipe_misc_thread_data->errors = 0;
+
+    /* Time values. */
+    int nwipe_hh;
+    int nwipe_mm;
+    int nwipe_ss;
+
+    struct timespec tim, tim2;
+    tim.tv_sec = 0;
+    tim.tv_nsec = 100000000L; /* sleep for 0.1 seconds */
+
+    /* Throughput variables */
+    u64 nwipe_throughput;
+
+    /* The number of active wipe processes. */
+    /* Set to 1 initially to start loop.    */
+    int nwipe_active = 1;
+
+    /* Used in the gui status loop to trap a failure of the halfdelay(), getch() mechanism to block for the designated
+     * period */
+    int expected_iterations;
+
+    /* Used in the selection loop to trap a failure of the timeout(), getch() mechanism to block for the designated
+     * period, initialise the counter */
+    int iteration_counter = 0;
+
+    time_t previous_iteration_timestamp = time( NULL );
+
+    /* Calculate Maximum allowed iterations per second (typically 20), which is double the expected iterations
+     * (typically 10) */
+    expected_iterations = ( 1000 / GETCH_GUI_STATS_UPDATE_MS ) * 2;
+
+    if( nwipe_time_start == 0 )
+    {
+        /* This is the first time that we have been called. */
+        nwipe_time_start = time( NULL ) - 1;
+    }
+
+    nwipe_gui_title( footer_window, end_wipe_footer );
+
+    loop_control = 1;
+
+    while( loop_control )
+    {
+        /* IMPORTANT ! Halfdelay(1) causes getch() to pause for 0.1 secs. This is important for two reasons.
+         * 1. Pauses the getch for 0.1 secs so that the screen is only updated max 10 times/sec. Without
+         *    this delay the loop would run hundreds of times per sec maxing out the core.
+         * 2. By keeping the delay below 0.2 seconds, i.e 0.1, it makes the keypress and resizing
+         *    nice and responsive.
+         */
+        halfdelay( GETCH_GUI_STATS_UPDATE_MS );  // Important, don't change this unless you know what you are doing !
+                                                 // Related to getch().
+
+        keystroke = getch();  // Get user input.
+
+        iteration_counter++;
+
+        /* Much like the same check we perform in the nwipe_gui_select() function, here we check that we are not looping
+         * any faster than as defined by the halfdelay() function above, typically this loop runs at 10 times a second.
+         * This check makes sure that if the loop runs faster than double this value i.e 20 times a second then the
+         * program exits. This check is therefore determining whether the getch() function is returning immediately
+         * rather than blocking for the defined period of 100ms. Why is this necessary? Some terminals (konsole &
+         * deriviatives) that are exited while nwipe is still running fail to terminate nwipe this causes the
+         * halfdelay()/getch() functions to immediately fail causing the loop frequency to drastically increase. We
+         * detect that speed increase here and therefore close down nwipe. This doesn't affect the use of the tmux
+         * terminal by which you can detach and reattach to running nwipe processes. tmux still works correctly.
+         */
+        if( previous_iteration_timestamp == time( NULL ) )
+        {
+            if( iteration_counter > expected_iterations )
+            {
+                nwipe_log( NWIPE_LOG_ERROR,
+                           "GUI.c,nwipe_gui_status(), loop runaway, did you close the terminal without exiting "
+                           "nwipe? Initiating shutdown now." );
+                /* Issue signal to nwipe to shutdown immediately but gracefully */
+                terminate_signal = 1;
+            }
+        }
+        else
+        {
+            /* new second, so reset counter */
+            iteration_counter = 0;
+            previous_iteration_timestamp = time( NULL );
+        }
+
+        /* Get the current time. */
+        if( nwipe_active && terminate_signal != 1 )
+        {
+            nwipe_time_now = time( NULL );
+            nwipe_time_stopped = nwipe_time_now;
+        }
+        else
+        {
+            nwipe_time_now = nwipe_time_stopped;
+        }
+
+        /* Erase the main window. */
+        werase( main_window );
+
+        /* Erase the stats window. */
+        werase( stats_window );
+
+        /* Erase the footer window */
+        werase( footer_window );
+
+        /* Only repaint the windows on terminal resize if the user hasn't blanked the screen */
+        if( nwipe_gui_blank == 0 )
+        {
+            if( nwipe_active != 0 )
+            {
+                /* if resizing the terminal during a wipe a specific footer is required */
+                nwipe_gui_create_all_windows_on_terminal_resize( 0, end_wipe_footer );
+            }
+            else
+            {
+                /* and if the wipes have finished a different footer is required */
+                nwipe_gui_create_all_windows_on_terminal_resize( 0, wipes_finished_footer );
+            }
+        }
+
+        /* Initialize our working offset to the third line. */
+        yy = 2;
+
+        /* Get the window dimensions. */
+        getmaxyx( main_window, wlines, wcols );
+
+        /* Less four lines for the box and padding. */
+        slots = wlines - 4;
+
+        /* Each element prints three lines. */
+        slots /= 3;
+
+        if( nwipe_active == 0 || terminate_signal == 1 )
+        {
+            nwipe_gui_title( footer_window, wipes_finished_footer );
+
+            // Refresh the footer_window ;
+            wnoutrefresh( footer_window );
+        }
+
+        if( terminate_signal == 1 )
+        {
+            loop_control = 0;
+        }
+
+        if( keystroke > 0x0a && keystroke < 0x7e && nwipe_gui_blank == 1 )
+        {
+            tft_saver = 0;
+            nwipe_init_pairs();
+            nwipe_gui_create_all_windows_on_terminal_resize( 1, end_wipe_footer );
+
+            /* Show screen */
+            nwipe_gui_blank = 0;
+
+            /* Set background */
+            wbkgdset( stdscr, COLOR_PAIR( 1 ) );
+            wclear( stdscr );
+
+            /* Unhide panels */
+            show_panel( header_panel );
+            show_panel( footer_panel );
+            show_panel( stats_panel );
+            show_panel( options_panel );
+            show_panel( main_panel );
+
+            /* Reprint the footer */
+            nwipe_gui_title( footer_window, end_wipe_footer );
+
+            // Refresh the footer_window ;
+            wnoutrefresh( footer_window );
+
+            /* Update panels */
+            update_panels();
+            doupdate();
+        }
+        else if( keystroke > 0 )
+        {
+
+            switch( keystroke )
+            {
+
+                case 'b':
+                case 'B':
+
+                    if( nwipe_gui_blank == 0 && tft_saver != 1 )
+                    {
+                        /* grey text on black background */
+                        tft_saver = 1;
+                        nwipe_init_pairs();
+                        nwipe_gui_create_all_windows_on_terminal_resize( 1, end_wipe_footer );
+                    }
+                    else
+                    {
+                        if( nwipe_gui_blank == 0 && tft_saver == 1 )
+                        {
+                            /* Blank screen. */
+                            tft_saver = 0;
+                            nwipe_gui_blank = 1;
+                            hide_panel( header_panel );
+                            hide_panel( footer_panel );
+                            hide_panel( stats_panel );
+                            hide_panel( options_panel );
+                            hide_panel( main_panel );
+                        }
+
+                        /* Set the background style. */
+                        wbkgdset( stdscr, COLOR_PAIR( 7 ) );
+                        wclear( stdscr );
+                    }
+
+                    break;
+
+                case KEY_DOWN:
+                case 'j':
+                case 'J':
+
+                    /* Scroll down. */
+                    offset += 1;
+
+                    if( count < slots )
+                    {
+                        offset = 0;
+                    }
+
+                    else if( offset + slots > count )
+                    {
+                        offset = count - slots;
+                    }
+
+                    break;
+
+                case KEY_UP:
+                case 'k':
+                case 'K':
+
+                    /* Scroll up. */
+                    offset -= 1;
+
+                    if( offset < 0 )
+                    {
+                        offset = 0;
+                    }
+
+                    break;
+
+                case ' ':
+                case 0x0a:
+
+                    /* Check whether we have finished all wipes, if yes exit while loop if user pressed spacebar or
+                     * return. */
+                    if( !nwipe_active || terminate_signal == 1 )
+                    {
+                        loop_control = 0;
+                    }
+
+                    break;
+
+                default:
+
+                    /* Do nothing. */
+                    break;
+            }
+
+        } /* keystroke */
+
+        /* If wipe has completed and user has specified auto poweroff or nowait then we can skip waiting for the user to
+         * press return */
+        if( !nwipe_active )
+        {
+            if( nwipe_options.autopoweroff || nwipe_options.nowait )
+            {
+                loop_control = 0;
+            }
+        }
+
+        /* Update data in statistics & main windows only if we're in 'gui' mode and only if a wipe has started */
+        if( nwipe_gui_blank == 0 && global_wipe_status == 1 )
+        {
+
+            if( terminate_signal != 1 )
+            {
+                nwipe_active = compute_stats( ptr );  // Returns number of active wipe threads
+            }
+
+            /* Print information for the user. */
+            for( i = offset; i < offset + slots && i < count; i++ )
+            {
+                /* Print the device details. */
+                mvwprintw( main_window,
+                           yy++,
+                           2,
+                           "%s %s [%s] ",
+                           c[i]->device_name,
+                           c[i]->device_type_str,
+                           c[i]->device_size_text );
+                wprintw_temperature( c[i] );
+                wprintw( main_window, "%s/%s", c[i]->device_model, c[i]->device_serial_no );
+
+                /* Check whether the child process is still running the wipe. */
+                if( c[i]->wipe_status == 1 )
+                {
+                    /* Print percentage and pass information. */
+                    mvwprintw( main_window,
+                               yy++,
+                               4,
+                               "[%5.2f%%, round %i of %i, pass %i of %i] ",
+                               c[i]->round_percent,
+                               c[i]->round_working,
+                               c[i]->round_count,
+                               c[i]->pass_working,
+                               c[i]->pass_count );
+
+                } /* child running */
+                else
+                {
+                    if( c[i]->result == 0 )
+                    {
+                        mvwprintw( main_window, yy++, 4, "[%05.2f%% complete, SUCCESS! ", c[i]->round_percent );
+                    }
+                    else if( c[i]->signal )
+                    {
+                        wattron( main_window, COLOR_PAIR( 9 ) );
+                        mvwprintw( main_window, yy++, 4, "(>>> FAILURE! <<<, signal %i) ", c[i]->signal );
+                        wattroff( main_window, COLOR_PAIR( 9 ) );
+                    }
+                    else
+                    {
+                        wattron( main_window, COLOR_PAIR( 9 ) );
+                        mvwprintw( main_window, yy++, 4, "(>>>FAILURE!<<<, code %i) ", c[i]->result );
+                        wattroff( main_window, COLOR_PAIR( 9 ) );
+                    }
+
+                } /* child returned */
+
+                if( c[i]->verify_errors )
+                {
+                    wprintw( main_window, "[verr:%llu] ", c[i]->verify_errors );
+                }
+                if( c[i]->pass_errors )
+                {
+                    wprintw( main_window, "[perr:%llu] ", c[i]->pass_errors );
+                }
+                if( c[i]->wipe_status == 1 )
+                {
+                    switch( c[i]->pass_type )
+                    {
+                        /* Each text field in square brackets should be the same number of characters
+                         * to retain output in columns */
+                        case NWIPE_PASS_FINAL_BLANK:
+                            if( !c[i]->sync_status )
+                            {
+                                wprintw( main_window, "[ blanking] " );
+                            }
+                            break;
+
+                        case NWIPE_PASS_FINAL_OPS2:
+                            if( !c[i]->sync_status )
+                            {
+                                wprintw( main_window, "[OPS2final] " );
+                            }
+                            break;
+
+                        case NWIPE_PASS_WRITE:
+                            if( !c[i]->sync_status )
+                            {
+                                wprintw( main_window, "[ writing ] " );
+                            }
+                            break;
+
+                        case NWIPE_PASS_VERIFY:
+                            if( !c[i]->sync_status )
+                            {
+                                wprintw( main_window, "[verifying] " );
+                            }
+                            break;
+
+                        case NWIPE_PASS_NONE:
+                            break;
+                    }
+
+                    if( c[i]->sync_status )
+                    {
+                        wprintw( main_window, "[ syncing ] " );
+                    }
+                }
+
+                /* Determine throughput nomenclature for this drive and output drives throughput to GUI */
+                Determine_C_B_nomenclature( c[i]->throughput, nomenclature_result_str, NOMENCLATURE_RESULT_STR_SIZE );
+
+                wprintw( main_window, "[%s/s] ", nomenclature_result_str );
+
+                /* Insert whitespace. */
+                yy += 1;
+
+                /* Increment the next spinner character for this context if the thread is active */
+                if( c[i]->wipe_status == 1 )
+                {
+                    spinner( c, i );
+                    spinner_string[0] = c[i]->spinner_character[0];
+                }
+                else
+                {
+                    /* If the wipe thread is no longer active, replace the spinner with a space */
+                    spinner_string[0] = ' ';
+                }
+                spinner_string[1] = 0;
+                wprintw( main_window, " %s ", spinner_string );
+            }
+
+            if( offset > 0 )
+            {
+                mvwprintw( main_window, 1, wcols - 8, " More " );
+                waddch( main_window, ACS_UARROW );
+            }
+
+            if( count - offset > slots )
+            {
+                mvwprintw( main_window, wlines - 2, wcols - 8, " More " );
+                waddch( main_window, ACS_DARROW );
+            }
+
+            /* Box the main window. */
+            box( main_window, 0, 0 );
+
+            /* Refresh the main window. */
+            wnoutrefresh( main_window );
+
+            /* Update the load average field, but only if we are still wiping */
+            if( nwipe_active && terminate_signal != 1 )
+            {
+                nwipe_gui_load();
+            }
+
+            nwipe_throughput = nwipe_misc_thread_data->throughput;
+
+            /* Determine the nomenclature for the combined throughput */
+            Determine_C_B_nomenclature( nwipe_throughput, nomenclature_result_str, NOMENCLATURE_RESULT_STR_SIZE );
+
+            /* Print the combined throughput. */
+            mvwprintw( stats_window, NWIPE_GUI_STATS_THROUGHPUT_Y, NWIPE_GUI_STATS_THROUGHPUT_X, "Throughput:" );
+
+            mvwprintw(
+                stats_window, NWIPE_GUI_STATS_THROUGHPUT_Y, NWIPE_GUI_STATS_TAB, "%s/s", nomenclature_result_str );
+
+            /* Change the current time into a delta. */
+            nwipe_time_now -= nwipe_time_start;
+
+            /* Put the delta into HH:mm:ss form. */
+            nwipe_hh = nwipe_time_now / 3600;
+            nwipe_time_now %= 3600;
+            nwipe_mm = nwipe_time_now / 60;
+            nwipe_time_now %= 60;
+            nwipe_ss = nwipe_time_now;
+
+            /* Print the runtime. */
+            mvwprintw( stats_window, NWIPE_GUI_STATS_RUNTIME_Y, 1, "Runtime:" );
+            mvwprintw( stats_window,
+                       NWIPE_GUI_STATS_RUNTIME_Y,
+                       NWIPE_GUI_STATS_TAB,
+                       "%02i:%02i:%02i",
+                       nwipe_hh,
+                       nwipe_mm,
+                       nwipe_ss );
+
+            mvwprintw( stats_window, NWIPE_GUI_STATS_ETA_Y, 1, "Remaining:" );
+
+            time_t nwipe_maxeta = nwipe_misc_thread_data->maxeta;
+            if( nwipe_maxeta > 0 )
+            {
+                /* Do it again for the estimated runtime remaining. */
+                nwipe_hh = nwipe_maxeta / 3600;
+                nwipe_maxeta %= 3600;
+                nwipe_mm = nwipe_maxeta / 60;
+                nwipe_maxeta %= 60;
+                nwipe_ss = nwipe_maxeta;
+
+                /* Print the estimated runtime remaining. */
+                mvwprintw( stats_window,
+                           NWIPE_GUI_STATS_ETA_Y,
+                           NWIPE_GUI_STATS_TAB,
+                           "%02i:%02i:%02i",
+                           nwipe_hh,
+                           nwipe_mm,
+                           nwipe_ss );
+            }
+
+            /* Print the error count. */
+            mvwprintw( stats_window, NWIPE_GUI_STATS_ERRORS_Y, NWIPE_GUI_STATS_ERRORS_X, "Errors:" );
+            mvwprintw(
+                stats_window, NWIPE_GUI_STATS_ERRORS_Y, NWIPE_GUI_STATS_TAB, "  %llu", nwipe_misc_thread_data->errors );
+
+            /* Add a border. */
+            box( stats_window, 0, 0 );
+
+            /* Add a title. */
+            mvwprintw( stats_window, 0, ( NWIPE_GUI_STATS_W - strlen( stats_title ) ) / 2, "%s", stats_title );
+
+            /* Refresh internal representation of stats window */
+            wnoutrefresh( stats_window );
+
+            /* Output all windows to screen */
+            doupdate();
+
+        }  // end blank screen if
+
+    } /* End of while loop */
+
+    if( nwipe_options.logfile[0] == '\0' )
+    {
+        nwipe_gui_title( footer_window, wipes_finished_footer );
+    }
+    else
+    {
+        char finish_message[NWIPE_GUI_FOOTER_W];
+        snprintf( finish_message,
+                  sizeof( finish_message ),
+                  "Wipe finished - press enter to exit. Logged to %s",
+                  nwipe_options.logfile );
+        nwipe_gui_title( footer_window, finish_message );
+    }
+    terminate_signal = 1;
+
+    return NULL;
+} /* nwipe_gui_status */
+
+int compute_stats( void* ptr )
+{
+    nwipe_thread_data_ptr_t* nwipe_thread_data_ptr;
+    nwipe_thread_data_ptr = (nwipe_thread_data_ptr_t*) ptr;
+
+    nwipe_context_t** c;
+    nwipe_misc_thread_data_t* nwipe_misc_thread_data;
+
+    c = nwipe_thread_data_ptr->c;
+    nwipe_misc_thread_data = nwipe_thread_data_ptr->nwipe_misc_thread_data;
+    int count = nwipe_misc_thread_data->nwipe_selected;
+
+    int nwipe_active = 0;
+    int i;
+
+    time_t nwipe_time_now = time( NULL );
+
+    nwipe_misc_thread_data->throughput = 0;
+    nwipe_misc_thread_data->maxeta = 0;
+    nwipe_misc_thread_data->errors = 0;
+
+    /* Enumerate all contexts to compute statistics. */
+    for( i = 0; i < count; i++ )
+    {
+        /* Check whether the child process is still running the wipe. */
+        if( c[i]->wipe_status == 1 )
+        {
+            /* Increment the child counter. */
+            nwipe_active += 1;
+
+            /* Even if the wipe has finished ALWAYS run the stats one last time so the final SUCCESS percentage value is
+             * correct. Maintain a rolling average of throughput. */
+            nwipe_update_speedring( &c[i]->speedring, c[i]->round_done, nwipe_time_now );
+
+            if( c[i]->speedring.timestotal > 0 && c[i]->wipe_status == 1 )
+            {
+                /* Update the current average throughput in bytes-per-second. */
+                c[i]->throughput = c[i]->speedring.bytestotal / c[i]->speedring.timestotal;
+
+                /* Only update the estimated remaining runtime if the
+                 * throughput for a given drive is greater than 100,000 bytes per second
+                 * This prevents enormous ETA's being calculated on an unresponsive
+                 * drive */
+                if( c[i]->throughput > 100000 )
+                {
+                    c[i]->eta = ( c[i]->round_size - c[i]->round_done ) / c[i]->throughput;
+
+                    if( c[i]->eta > nwipe_misc_thread_data->maxeta )
+                    {
+                        nwipe_misc_thread_data->maxeta = c[i]->eta;
+                    }
+                }
+            }
+
+            /* Calculate the average throughput */
+            c[i]->throughput = (double) c[i]->round_done / (double) difftime( nwipe_time_now, c[i]->start_time );
+        }
+
+        /* Update the percentage value. */
+        c[i]->round_percent = (double) c[i]->round_done / (double) c[i]->round_size * 100;
+
+        if( c[i]->wipe_status == 1 )
+        {
+            /* Accumulate combined throughput. */
+            nwipe_misc_thread_data->throughput += c[i]->throughput;
+        }
+
+        /* Accumulate the error count. */
+        nwipe_misc_thread_data->errors += c[i]->pass_errors;
+        nwipe_misc_thread_data->errors += c[i]->verify_errors;
+        nwipe_misc_thread_data->errors += c[i]->fsyncdata_errors;
+
+        /* Read the drive temperature values */
+        if( nwipe_time_now > ( c[i]->temp1_time + 60 ) )
+        {
+            nwipe_update_temperature( c[i] );
+        }
+
+    } /* for statistics */
+
+    return nwipe_active;
+}
+
+void nwipe_update_speedring( nwipe_speedring_t* speedring, u64 speedring_bytes, time_t speedring_now )
+{
+
+    if( speedring->timeslast == 0 )
+    {
+        /* Ignore the first sample and initialize. */
+        speedring->timeslast = speedring_now;
+        return;
+    }
+
+    if( speedring_now - speedring->timeslast < NWIPE_KNOB_SPEEDRING_GRANULARITY )
+    {
+        /* Avoid jitter caused by frequent updates. */
+        return;
+    }
+
+    /* Subtract the oldest speed sample from the accumulator. */
+    speedring->bytestotal -= speedring->bytes[speedring->position];
+    speedring->timestotal -= speedring->times[speedring->position];
+
+    /* Put the latest bytes-per-second sample into the ring buffer. */
+    speedring->bytes[speedring->position] = speedring_bytes - speedring->byteslast;
+    speedring->times[speedring->position] = speedring_now - speedring->timeslast;
+
+    /* Add the newest speed sample to the accumulator. */
+    speedring->bytestotal += speedring->bytes[speedring->position];
+    speedring->timestotal += speedring->times[speedring->position];
+
+    /* Remember the last sample. */
+    speedring->byteslast = speedring_bytes;
+    speedring->timeslast = speedring_now;
+
+    if( ++speedring->position >= NWIPE_KNOB_SPEEDRING_SIZE )
+    {
+        speedring->position = 0;
+    }
+}
+
+int spinner( nwipe_context_t** ptr, int device_idx )
+{
+    nwipe_context_t** c;
+
+    c = ptr;
+
+    /* The spinner characters |/-\|/-\ */
+    char sc[9] = "|/-\\|/-\\/";
+
+    /* Check sanity of index */
+    if( c[device_idx]->spinner_idx < 0 || c[device_idx]->spinner_idx > 7 )
+    {
+        return 1;
+    }
+
+    c[device_idx]->spinner_character[0] = sc[c[device_idx]->spinner_idx];
+
+    c[device_idx]->spinner_idx++;
+
+    if( c[device_idx]->spinner_idx > 7 )
+    {
+        c[device_idx]->spinner_idx = 0;
+    }
+
+    return 0;
+}
+
+void temp1_flash( nwipe_context_t* c )
+{
+    if( c->temp1_flash_rate_counter < c->temp1_flash_rate )
+    {
+        c->temp1_flash_rate_counter++;
+    }
+    else
+    {
+        c->temp1_flash_rate_counter = 0;
+        if( c->temp1_flash_rate_status == 0 )
+        {
+            c->temp1_flash_rate_status = 1;
+        }
+        else
+        {
+            c->temp1_flash_rate_status = 0;
+        }
+    }
+}
+
+void wprintw_temperature( nwipe_context_t* c )
+{
+    /* If available, print the current temperature. This function determines
+     * whether the temperature should be printed as white, solid red, flashing red
+     * solid black or flashing black and then prints it to the main_window.
+     */
+    if( c->temp1_input != 1000000 )
+    {
+        /* if drive temperature has exceeded critical continuous running
+         * temperature && critical value is valid
+         */
+        if( c->temp1_input >= c->temp1_crit && c->temp1_crit != 1000000 )
+        {
+            temp1_flash( c );
+
+            if( c->temp1_flash_rate_status == 0 )
+            {
+                /* blue on blue */
+                wattron( main_window, COLOR_PAIR( 12 ) );
+                wprintw( main_window, "[%dC] ", c->temp1_input );
+                wattroff( main_window, COLOR_PAIR( 12 ) );
+            }
+            else
+            {
+                /* red on blue */
+                wattron( main_window, COLOR_PAIR( 3 ) );
+                wprintw( main_window, "[%dC] ", c->temp1_input );
+                wattroff( main_window, COLOR_PAIR( 3 ) );
+            }
+        }
+        else
+        {
+            /* if drive temperature has exceeded maximum continuous running
+             * temperature && max value is valid
+             */
+            if( c->temp1_input >= c->temp1_max && c->temp1_max != 1000000 )
+            {
+                /* red on blue */
+                wattron( main_window, COLOR_PAIR( 3 ) );
+                wprintw( main_window, "[%dC] ", c->temp1_input );
+                wattroff( main_window, COLOR_PAIR( 3 ) );
+            }
+            else
+            {
+                /* if drive temperature is below the critical temperature && critical value is valid */
+                if( c->temp1_input <= c->temp1_lcrit && c->temp1_lcrit != 1000000 )
+                {
+                    temp1_flash( c );
+                    if( c->temp1_flash_rate_status == 0 )
+                    {
+                        /* blue on blue */
+                        wattron( main_window, COLOR_PAIR( 12 ) );
+                        wprintw( main_window, "[%dC] ", c->temp1_input );
+                        wattroff( main_window, COLOR_PAIR( 12 ) );
+                    }
+                    else
+                    {
+                        /* black on blue */
+                        wattron( main_window, COLOR_PAIR( 11 ) );
+                        wprintw( main_window, "[%dC] ", c->temp1_input );
+                        wattroff( main_window, COLOR_PAIR( 11 ) );
+                    }
+                }
+                else
+                {
+                    /* if drive temperature is below the minimum continuous running temperature && minimum
+                     * value is valid */
+                    if( c->temp1_input <= c->temp1_min && c->temp1_min != 1000000 )
+                    {
+                        /* black on blue */
+                        wattron( main_window, COLOR_PAIR( 11 ) );
+                        wprintw( main_window, "[%dC] ", c->temp1_input );
+                        wattroff( main_window, COLOR_PAIR( 11 ) );
+                    }
+                    else
+                    {
+                        /* Default white on blue */
+                        wprintw( main_window, "[%dC] ", c->temp1_input );
+                    }
+                }
+            }
+        }
+    }
+    else
+    {
+        wprintw( main_window, "[--C] " );
+    }
+}
diff --git a/src/gui.h b/src/gui.h
new file mode 100644
index 0000000..29d00e6
--- /dev/null
+++ b/src/gui.h
@@ -0,0 +1,62 @@
+/*
+ *  gui.h: An ncurses GUI for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef GUI_H_
+#define GUI_H_
+
+void nwipe_gui_free( void );  // Stop the GUI.
+void nwipe_gui_init( void );  // Start the GUI.
+void nwipe_gui_create_main_window( void );  // Create the main window
+void nwipe_gui_create_header_window( void );  // Create the header window
+void nwipe_gui_create_footer_window( const char* );  // Create the footer window and write text
+void nwipe_gui_create_options_window( void );  // Create the options window
+void nwipe_gui_create_stats_window( void );  // Create the stats window
+void nwipe_gui_create_all_windows_on_terminal_resize(
+    int force_creation,
+    const char* footer_text );  // If terminal is resized recreate all windows
+void nwipe_gui_select( int count, nwipe_context_t** c );  // Select devices to wipe.
+void* nwipe_gui_status( void* ptr );  // Update operation progress.
+void nwipe_gui_method( void );  // Change the method option.
+void nwipe_gui_options( void );  // Update the options window.
+void nwipe_gui_prng( void );  // Change the prng option.
+void nwipe_gui_rounds( void );  // Change the rounds option.
+void nwipe_gui_verify( void );  // Change the verify option.
+void nwipe_gui_noblank( void );  // Change the noblank option.
+int spinner( nwipe_context_t** ptr, int );  // Return the next spinner character
+void temp1_flash( nwipe_context_t* );  // toggles term1_flash_status, which flashes the temperature
+void wprintw_temperature( nwipe_context_t* );
+
+int compute_stats( void* ptr );
+void nwipe_update_speedring( nwipe_speedring_t* speedring, u64 speedring_done, time_t speedring_now );
+
+#define NOMENCLATURE_RESULT_STR_SIZE 8
+
+/* Note Do not change unless you understand how this value affects keyboard response and screen refresh when
+ * the drive selection screen is displayed. (prior to wipe starting). */
+#define GETCH_BLOCK_MS 250 /* millisecond block time for getch() */
+
+/* Note The value of 1 (100ms) is the ideal speed for screen refresh during a wipe, a value of 2 is noticably slower,
+ * don't change unless you understand how this value affects keyboard responsiveness and speed of screen stats/spinner
+ * updating */
+#define GETCH_GUI_STATS_UPDATE_MS 1 /* 1 * 100 = 1/10/sec = millisecond block time for gui stats screen updates */
+
+#endif /* GUI_H_ */
diff --git a/src/isaac_rand/isaac64.c b/src/isaac_rand/isaac64.c
new file mode 100644
index 0000000..3e4203b
--- /dev/null
+++ b/src/isaac_rand/isaac64.c
@@ -0,0 +1,119 @@
+/*
+------------------------------------------------------------------------------
+isaac64.c: My random number generator for 64-bit machines.
+By Bob Jenkins, 1996.  Public Domain.
+------------------------------------------------------------------------------
+*/
+#ifndef STANDARD
+#include "isaac_standard.h"
+#endif
+#ifndef ISAAC64
+#include "isaac64.h"
+#endif
+
+
+#define ind(mm,x)  (*(ub8 *)((ub1 *)(mm) + ((x) & ((RANDSIZ-1)<<3))))
+#define rngstep(mix,a,b,mm,m,m2,r,x) \
+{ \
+  x = *m;  \
+  a = (mix) + *(m2++); \
+  *(m++) = y = ind(mm,x) + a + b; \
+  *(r++) = b = ind(mm,y>>RANDSIZL) + x; \
+}
+
+void isaac64(rand64ctx *ctx)
+{
+  register ub8 a,b,x,y,*m,*mm,*m2,*r,*mend;
+  mm=ctx->mm; r=ctx->randrsl;
+  a = ctx->aa; b = ctx->bb + (++ctx->cc);
+  for (m = mm, mend = m2 = m+(RANDSIZ/2); m<mend; )
+  {
+    rngstep(~(a^(a<<21)), a, b, mm, m, m2, r, x);
+    rngstep(  a^(a>>5)  , a, b, mm, m, m2, r, x);
+    rngstep(  a^(a<<12) , a, b, mm, m, m2, r, x);
+    rngstep(  a^(a>>33) , a, b, mm, m, m2, r, x);
+  }
+  for (m2 = mm; m2<mend; )
+  {
+    rngstep(~(a^(a<<21)), a, b, mm, m, m2, r, x);
+    rngstep(  a^(a>>5)  , a, b, mm, m, m2, r, x);
+    rngstep(  a^(a<<12) , a, b, mm, m, m2, r, x);
+    rngstep(  a^(a>>33) , a, b, mm, m, m2, r, x);
+  }
+  ctx->bb = b; ctx->aa = a;
+}
+
+#define mix(a,b,c,d,e,f,g,h) \
+{ \
+   a-=e; f^=h>>9;  h+=a; \
+   b-=f; g^=a<<9;  a+=b; \
+   c-=g; h^=b>>23; b+=c; \
+   d-=h; a^=c<<15; c+=d; \
+   e-=a; b^=d>>14; d+=e; \
+   f-=b; c^=e<<20; e+=f; \
+   g-=c; d^=f>>17; f+=g; \
+   h-=d; e^=g<<14; g+=h; \
+}
+
+void rand64init(rand64ctx *ctx, word flag)
+{
+   word i;
+   ub8 a,b,c,d,e,f,g,h;
+   ub8 *mm, *randrsl;
+   ctx->aa = ctx->bb = ctx->cc = (ub8)0;
+   mm=ctx->mm;
+   randrsl=ctx->randrsl;
+   a=b=c=d=e=f=g=h=0x9e3779b97f4a7c13LL;  /* the golden ratio */
+
+   for (i=0; i<4; ++i)                    /* scramble it */
+   {
+     mix(a,b,c,d,e,f,g,h);
+   }
+
+   for (i=0; i<RANDSIZ; i+=8)   /* fill in mm[] with messy stuff */
+   {
+     if (flag)                  /* use all the information in the seed */
+     {
+       a+=randrsl[i  ]; b+=randrsl[i+1]; c+=randrsl[i+2]; d+=randrsl[i+3];
+       e+=randrsl[i+4]; f+=randrsl[i+5]; g+=randrsl[i+6]; h+=randrsl[i+7];
+     }
+     mix(a,b,c,d,e,f,g,h);
+     mm[i  ]=a; mm[i+1]=b; mm[i+2]=c; mm[i+3]=d;
+     mm[i+4]=e; mm[i+5]=f; mm[i+6]=g; mm[i+7]=h;
+   }
+
+   if (flag) 
+   {        /* do a second pass to make all of the seed affect all of mm */
+     for (i=0; i<RANDSIZ; i+=8)
+     {
+       a+=mm[i  ]; b+=mm[i+1]; c+=mm[i+2]; d+=mm[i+3];
+       e+=mm[i+4]; f+=mm[i+5]; g+=mm[i+6]; h+=mm[i+7];
+       mix(a,b,c,d,e,f,g,h);
+       mm[i  ]=a; mm[i+1]=b; mm[i+2]=c; mm[i+3]=d;
+       mm[i+4]=e; mm[i+5]=f; mm[i+6]=g; mm[i+7]=h;
+     }
+   }
+
+   isaac64(ctx);          /* fill in the first set of results */
+   ctx->randcnt=RANDSIZ;  /* prepare to use the first set of results */
+}
+
+#ifdef NEVER
+int main()
+{
+  ub8 i,j;
+  rand64ctx ctx;
+  ctx.aa=ctx.bb=ctx.cc=(ub8)0;
+  for (i=0; i<RANDSIZ; ++i) ctx.mm[i]=(ub8)0;
+  rand64init(&ctx, TRUE);
+  for (i=0; i<2; ++i)
+  {
+    isaac64(&ctx);
+    for (j=0; j<RANDSIZ; ++j)
+    {
+      printf("%.8lx%.8lx",(ub4)(ctx.randrsl[j]>>32),(ub4)ctx.randrsl[j]);
+      if ((j&3)==3) printf("\n");
+    }
+  }
+}
+#endif
diff --git a/src/isaac_rand/isaac64.h b/src/isaac_rand/isaac64.h
new file mode 100644
index 0000000..e2ab55b
--- /dev/null
+++ b/src/isaac_rand/isaac64.h
@@ -0,0 +1,41 @@
+/*
+------------------------------------------------------------------------------
+isaac64.h: definitions for a random number generator
+Bob Jenkins, 1996, Public Domain
+------------------------------------------------------------------------------
+*/
+#ifndef ISAAC64
+#define ISAAC64
+
+#include "isaac_standard.h"
+
+struct rand64ctx
+{
+ ub8 randrsl[RANDSIZ], randcnt;
+ ub8 mm[RANDSIZ];
+ ub8 aa, bb, cc;
+};
+typedef struct rand64ctx rand64ctx;
+
+/*
+------------------------------------------------------------------------------
+ If (flag==TRUE), then use the contents of randrsl[0..255] as the seed.
+------------------------------------------------------------------------------
+*/
+void rand64init(rand64ctx *r, word flag);
+
+void isaac64(rand64ctx *ctx);
+
+
+/*
+------------------------------------------------------------------------------
+ Call rand64() to retrieve a single 64-bit random value
+------------------------------------------------------------------------------
+*/
+#define isaac64_rand() \
+   (!(r)->randcnt-- ? \
+     (isaac64(r), (r)->randcnt=RANDSIZ-1, (r)->randrsl[(r)->>randcnt]) : \
+     (r)->randrsl[(r)->randcnt])
+
+#endif  /* ISAAC64 */
+
diff --git a/src/isaac_rand/isaac_rand.c b/src/isaac_rand/isaac_rand.c
new file mode 100644
index 0000000..c9220e0
--- /dev/null
+++ b/src/isaac_rand/isaac_rand.c
@@ -0,0 +1,169 @@
+/*
+------------------------------------------------------------------------------
+rand.c: By Bob Jenkins.  My random number generator, ISAAC.  Public Domain.
+MODIFIED:
+  960327: Creation (addition of randinit, really)
+  970719: use context, not global variables, for internal state
+  980324: added main (ifdef'ed out), also rearranged randinit()
+  010626: Note that this is public domain
+------------------------------------------------------------------------------
+*/
+#ifndef STANDARD
+#include "isaac_standard.h"
+#endif
+#ifndef RAND
+#include "isaac_rand.h"
+#endif
+
+
+#define ind(mm,x)  (*(ub4 *)((ub1 *)(mm) + ((x) & ((RANDSIZ-1)<<2))))
+#define rngstep(mix,a,b,mm,m,m2,r,x) \
+{ \
+  x = *m;  \
+  a = (a^(mix)) + *(m2++); \
+  *(m++) = y = ind(mm,x) + a + b; \
+  *(r++) = b = ind(mm,y>>RANDSIZL) + x; \
+}
+
+void     isaac(ctx)
+randctx *ctx;
+{
+   register ub4 a,b,x,y,*m,*mm,*m2,*r,*mend;
+   mm=ctx->randmem; 
+   r=ctx->randrsl;
+   a = ctx->randa; 
+   b = ctx->randb + (++ctx->randc);
+   for (m = mm, mend = m2 = m+(RANDSIZ/2); m<mend; )
+   {
+      rngstep( a<<13, a, b, mm, m, m2, r, x);
+      rngstep( a>>6 , a, b, mm, m, m2, r, x);
+      rngstep( a<<2 , a, b, mm, m, m2, r, x);
+      rngstep( a>>16, a, b, mm, m, m2, r, x);
+   }
+   for (m2 = mm; m2<mend; )
+   {
+      rngstep( a<<13, a, b, mm, m, m2, r, x);
+      rngstep( a>>6 , a, b, mm, m, m2, r, x);
+      rngstep( a<<2 , a, b, mm, m, m2, r, x);
+      rngstep( a>>16, a, b, mm, m, m2, r, x);
+   }
+   ctx->randb = b; ctx->randa = a;
+}
+
+
+#define mix(a,b,c,d,e,f,g,h) \
+{ \
+   a^=b<<11; d+=a; b+=c; \
+   b^=c>>2;  e+=b; c+=d; \
+   c^=d<<8;  f+=c; d+=e; \
+   d^=e>>16; g+=d; e+=f; \
+   e^=f<<10; h+=e; f+=g; \
+   f^=g>>4;  a+=f; g+=h; \
+   g^=h<<8;  b+=g; h+=a; \
+   h^=a>>9;  c+=h; a+=b; \
+}
+
+/* if (flag==TRUE), then use the contents of randrsl[] to initialize mm[]. */
+void randinit(ctx, flag)
+randctx *ctx;
+word     flag;
+{
+   word i;
+   ub4 a,b,c,d,e,f,g,h;
+   ub4 *m,*r;
+   ctx->randa = ctx->randb = ctx->randc = 0;
+   m=ctx->randmem;
+   r=ctx->randrsl;
+   a=b=c=d=e=f=g=h=0x9e3779b9;  /* the golden ratio */
+
+   for (i=0; i<4; ++i)          /* scramble it */
+   {
+     mix(a,b,c,d,e,f,g,h);
+   }
+
+   if (flag) 
+   {
+     /* initialize using the contents of r[] as the seed */
+     for (i=0; i<RANDSIZ; i+=8)
+     {
+       a+=r[i  ]; 
+       b+=r[i+1];
+       c+=r[i+2]; 
+       d+=r[i+3];
+       e+=r[i+4]; 
+       f+=r[i+5]; 
+       g+=r[i+6]; 
+       h+=r[i+7];
+       mix(a,b,c,d,e,f,g,h);
+       m[i  ]=a; 
+       m[i+1]=b; 
+       m[i+2]=c; 
+       m[i+3]=d;
+       m[i+4]=e; 
+       m[i+5]=f; 
+       m[i+6]=g; 
+       m[i+7]=h;
+     }
+     /* do a second pass to make all of the seed affect all of m */
+     for (i=0; i<RANDSIZ; i+=8)
+     {
+       a+=m[i  ]; 
+       b+=m[i+1]; 
+       c+=m[i+2]; 
+       d+=m[i+3];
+       e+=m[i+4]; 
+       f+=m[i+5]; 
+       g+=m[i+6]; 
+       h+=m[i+7];
+       mix(a,b,c,d,e,f,g,h);
+       m[i  ]=a; 
+       m[i+1]=b; 
+       m[i+2]=c; 
+       m[i+3]=d;
+       m[i+4]=e; 
+       m[i+5]=f; 
+       m[i+6]=g; 
+       m[i+7]=h;
+     }
+   }
+   else
+   {
+     /* fill in m[] with messy stuff */
+     for (i=0; i<RANDSIZ; i+=8)
+     {
+       mix(a,b,c,d,e,f,g,h);
+       m[i  ]=a; 
+       m[i+1]=b; 
+       m[i+2]=c; 
+       m[i+3]=d;
+       m[i+4]=e; 
+       m[i+5]=f; 
+       m[i+6]=g; 
+       m[i+7]=h;
+     }
+   }
+
+   isaac(ctx);            /* fill in the first set of results */
+   ctx->randcnt=RANDSIZ;  /* prepare to use the first set of results */
+}
+
+
+#ifdef NEVER
+int main()
+{
+  ub4 i,j;
+  randctx ctx;
+  ctx.randa=ctx.randb=ctx.randc=(ub4)0;
+  for (i=0; i<256; ++i) ctx.randrsl[i]=(ub4)0;
+  randinit(&ctx, TRUE);
+  for (i=0; i<2; ++i)
+  {
+    isaac(&ctx);
+    for (j=0; j<256; ++j)
+    {
+      printf("%.8lx",ctx.randrsl[j]);
+      if ((j&7)==7) printf("\n");
+    }
+  }
+}
+#endif
diff --git a/src/isaac_rand/isaac_rand.h b/src/isaac_rand/isaac_rand.h
new file mode 100644
index 0000000..167a2fd
--- /dev/null
+++ b/src/isaac_rand/isaac_rand.h
@@ -0,0 +1,52 @@
+/*
+------------------------------------------------------------------------------
+rand.h: definitions for a random number generator
+By Bob Jenkins, 1996, Public Domain
+MODIFIED:
+  960327: Creation (addition of randinit, really)
+  970719: use context, not global variables, for internal state
+  980324: renamed seed to flag
+  980605: recommend RANDSIZL=4 for noncryptography.
+  010626: note this is public domain
+------------------------------------------------------------------------------
+*/
+#ifndef RAND
+#define RAND
+
+#include "isaac_standard.h"
+
+/* context of random number generator */
+struct randctx
+{
+  ub4 randcnt;
+  ub4 randrsl[RANDSIZ];
+  ub4 randmem[RANDSIZ];
+  ub4 randa;
+  ub4 randb;
+  ub4 randc;
+};
+typedef  struct randctx  randctx;
+
+/*
+------------------------------------------------------------------------------
+ If (flag==TRUE), then use the contents of randrsl[0..RANDSIZ-1] as the seed.
+------------------------------------------------------------------------------
+*/
+void randinit(/*_ randctx *r, word flag _*/);
+
+void isaac(/*_ randctx *r _*/);
+
+
+/*
+------------------------------------------------------------------------------
+ Call rand(/o_ randctx *r _o/) to retrieve a single 32-bit random value
+------------------------------------------------------------------------------
+*/
+#define isaac_rand(r) \
+   (!(r)->randcnt-- ? \
+     (isaac(r), (r)->randcnt=RANDSIZ-1, (r)->randrsl[(r)->randcnt]) : \
+     (r)->randrsl[(r)->randcnt])
+
+#endif  /* RAND */
+
+
diff --git a/src/isaac_rand/isaac_standard.h b/src/isaac_rand/isaac_standard.h
new file mode 100644
index 0000000..5323d3f
--- /dev/null
+++ b/src/isaac_rand/isaac_standard.h
@@ -0,0 +1,60 @@
+/*
+------------------------------------------------------------------------------
+Standard definitions and types, Bob Jenkins
+------------------------------------------------------------------------------
+*/
+#ifndef STANDARD
+# define STANDARD
+# ifndef STDIO
+#  include <stdio.h>
+#  define STDIO
+# endif
+# ifndef STDDEF
+#  include <stddef.h>
+#  define STDDEF
+# endif
+typedef  unsigned long long  ub8;
+#define UB8MAXVAL 0xffffffffffffffffLL
+#define UB8BITS 64
+typedef    signed long long  sb8;
+#define SB8MAXVAL 0x7fffffffffffffffLL
+typedef  unsigned long  int  ub4;   /* unsigned 4-byte quantities */
+#define UB4MAXVAL 0xffffffff
+typedef    signed long  int  sb4;
+#define UB4BITS 32
+#define SB4MAXVAL 0x7fffffff
+typedef  unsigned short int  ub2;
+#define UB2MAXVAL 0xffff
+#define UB2BITS 16
+typedef    signed short int  sb2;
+#define SB2MAXVAL 0x7fff
+typedef  unsigned       char ub1;
+#define UB1MAXVAL 0xff
+#define UB1BITS 8
+typedef    signed       char sb1;   /* signed 1-byte quantities */
+#define SB1MAXVAL 0x7f
+typedef                 int  word;  /* fastest type available */
+
+#define bis(target,mask)  ((target) |=  (mask))
+#define bic(target,mask)  ((target) &= ~(mask))
+#define bit(target,mask)  ((target) &   (mask))
+#ifndef min
+# define min(a,b) (((a)<(b)) ? (a) : (b))
+#endif /* min */
+#ifndef max
+# define max(a,b) (((a)<(b)) ? (b) : (a))
+#endif /* max */
+#ifndef align
+# define align(a) (((ub4)a+(sizeof(void *)-1))&(~(sizeof(void *)-1)))
+#endif /* align */
+#ifndef abs
+# define abs(a)   (((a)>0) ? (a) : -(a))
+#endif
+#define TRUE  1
+#define FALSE 0
+#define SUCCESS 0  /* 1 on VAX */
+
+#define RANDSIZL   (8)  /* I recommend 8 for crypto, 4 for simulations */
+#define RANDSIZ    (1<<RANDSIZL)
+
+#endif /* STANDARD */
diff --git a/src/logging.c b/src/logging.c
new file mode 100644
index 0000000..1ff3ed1
--- /dev/null
+++ b/src/logging.c
@@ -0,0 +1,1007 @@
+/*
+ *  logging.c:  Logging facilities for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#ifndef _POSIX_SOURCE
+#define _POSIX_SOURCE
+#endif
+
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+#include "stdarg.h"
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "prng.h"
+#include "options.h"
+#include "logging.h"
+
+/* Global array to hold log values to print when logging to STDOUT */
+char** log_lines;
+int log_current_element = 0;
+int log_elements_allocated = 0;
+int log_elements_displayed = 0;
+pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
+
+void nwipe_log( nwipe_log_t level, const char* format, ... )
+{
+    /**
+     *  Writes a message to the program log file.
+     *
+     */
+
+    extern int terminate_signal;
+    extern int user_abort;
+
+    char** result;
+    char* malloc_result;
+    char message_buffer[MAX_LOG_LINE_CHARS * sizeof( char )];
+    int chars_written;
+
+    int message_buffer_length;
+    int r; /* result buffer */
+
+    /* A time buffer. */
+    time_t t;
+
+    /* A pointer to the system time struct. */
+    struct tm* p;
+    r = pthread_mutex_lock( &mutex1 );
+    if( r != 0 )
+    {
+        fprintf( stderr, "nwipe_log: pthread_mutex_lock failed. Code %i \n", r );
+        return;
+    }
+
+    /* Get the current time. */
+    t = time( NULL );
+    p = localtime( &t );
+
+    /* Position of writing to current log string */
+    int line_current_pos = 0;
+
+    /* initialise characters written */
+    chars_written = 0;
+
+    /* Print the date. The rc script uses the same format. */
+    if( level != NWIPE_LOG_NOTIMESTAMP )
+    {
+        chars_written = snprintf( message_buffer,
+                                  MAX_LOG_LINE_CHARS,
+                                  "[%i/%02i/%02i %02i:%02i:%02i] ",
+                                  1900 + p->tm_year,
+                                  1 + p->tm_mon,
+                                  p->tm_mday,
+                                  p->tm_hour,
+                                  p->tm_min,
+                                  p->tm_sec );
+    }
+
+    /*
+     * Has the end of the buffer been reached ?, snprintf returns the number of characters that would have been
+     * written if MAX_LOG_LINE_CHARS had not been reached, it does not return the actual characters written in
+     * all circumstances, hence why we need to check whether it's greater than MAX_LOG_LINE_CHARS and if so set
+     * it to MAX_LOG_LINE_CHARS, preventing a buffer overrun further down this function.
+     */
+
+    /* check if there was a complete failure to write this part of the message, in which case return */
+    if( chars_written < 0 )
+    {
+        fprintf( stderr, "nwipe_log: snprintf error when writing log line to memory.\n" );
+        r = pthread_mutex_unlock( &mutex1 );
+        if( r != 0 )
+        {
+            fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+            return;
+        }
+    }
+    else
+    {
+        if( ( line_current_pos + chars_written ) > MAX_LOG_LINE_CHARS )
+        {
+            fprintf( stderr,
+                     "nwipe_log: Warning! The log line has been truncated as it exceeded %i characters\n",
+                     MAX_LOG_LINE_CHARS );
+            line_current_pos = MAX_LOG_LINE_CHARS;
+        }
+        else
+        {
+            line_current_pos += chars_written;
+        }
+    }
+
+    if( line_current_pos < MAX_LOG_LINE_CHARS )
+    {
+        switch( level )
+        {
+
+            case NWIPE_LOG_NONE:
+            case NWIPE_LOG_NOTIMESTAMP:
+                /* Do nothing. */
+                break;
+
+                /* NOTE! The debug labels, i.e. debug, info, notice etc should be left padded with spaces, in order
+                 * to maintain column alignment. Pad a label to achieve the length of whatever the longest label happens
+                 * to be. Important to know if you are thinking of adding another label.
+                 */
+
+            case NWIPE_LOG_DEBUG:
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, "  debug: " );
+                break;
+
+            case NWIPE_LOG_INFO:
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, "   info: " );
+                break;
+
+            case NWIPE_LOG_NOTICE:
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, " notice: " );
+                break;
+
+            case NWIPE_LOG_WARNING:
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, "warning: " );
+                break;
+
+            case NWIPE_LOG_ERROR:
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, "  error: " );
+                break;
+
+            case NWIPE_LOG_FATAL:
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, "  fatal: " );
+                break;
+
+            case NWIPE_LOG_SANITY:
+                /* TODO: Request that the user report the log. */
+                chars_written =
+                    snprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, " sanity: " );
+                break;
+
+            default:
+                chars_written = snprintf(
+                    message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos, "level %i: ", level );
+        }
+
+        /*
+         * Has the end of the buffer been reached ?
+         */
+        if( chars_written < 0 )
+        {
+            fprintf( stderr, "nwipe_log: snprintf error when writing log line to memory.\n" );
+            r = pthread_mutex_unlock( &mutex1 );
+            if( r != 0 )
+            {
+                fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+                return;
+            }
+        }
+        else
+        {
+            if( ( line_current_pos + chars_written ) > MAX_LOG_LINE_CHARS )
+            {
+                fprintf( stderr,
+                         "nwipe_log: Warning! The log line has been truncated as it exceeded %i characters\n",
+                         MAX_LOG_LINE_CHARS );
+                line_current_pos = MAX_LOG_LINE_CHARS;
+            }
+            else
+            {
+                line_current_pos += chars_written;
+            }
+        }
+    }
+
+    /* The variable argument pointer. */
+    va_list ap;
+
+    /* Fetch the argument list. */
+    va_start( ap, format );
+
+    /* Print the event. */
+    if( line_current_pos < MAX_LOG_LINE_CHARS )
+    {
+        chars_written =
+            vsnprintf( message_buffer + line_current_pos, MAX_LOG_LINE_CHARS - line_current_pos - 1, format, ap );
+
+        if( chars_written < 0 )
+        {
+            fprintf( stderr, "nwipe_log: snprintf error when writing log line to memory.\n" );
+            r = pthread_mutex_unlock( &mutex1 );
+            if( r != 0 )
+            {
+                fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+                va_end( ap );
+                return;
+            }
+        }
+        else
+        {
+            if( ( line_current_pos + chars_written ) > MAX_LOG_LINE_CHARS )
+            {
+                fprintf( stderr,
+                         "nwipe_log: Warning! The log line has been truncated as it exceeded %i characters\n",
+                         MAX_LOG_LINE_CHARS );
+                line_current_pos = MAX_LOG_LINE_CHARS;
+            }
+            else
+            {
+                line_current_pos += chars_written;
+            }
+        }
+    }
+
+    fflush( stdout );
+    /* Increase the current log element pointer - we will write here, deallocation is done in cleanup() in nwipe.c */
+    if( log_current_element == log_elements_allocated )
+    {
+        log_elements_allocated++;
+        result = realloc( log_lines, ( log_elements_allocated ) * sizeof( char* ) );
+        if( result == NULL )
+        {
+            fprintf( stderr, "nwipe_log: realloc failed when adding a log line.\n" );
+            r = pthread_mutex_unlock( &mutex1 );
+            if( r != 0 )
+            {
+                fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+                va_end( ap );
+                return;
+            }
+        }
+        log_lines = result;
+
+        /* Allocate memory for storing a single log message, deallocation is done in cleanup() in nwipe.c */
+        message_buffer_length = strlen( message_buffer ) * sizeof( char );
+        malloc_result = malloc( ( message_buffer_length + 1 ) * sizeof( char ) );
+        if( malloc_result == NULL )
+        {
+            fprintf( stderr, "nwipe_log: malloc failed when adding a log line.\n" );
+            r = pthread_mutex_unlock( &mutex1 );
+            if( r != 0 )
+            {
+                fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+                va_end( ap );
+                return;
+            }
+        }
+        log_lines[log_current_element] = malloc_result;
+    }
+
+    strcpy( log_lines[log_current_element], message_buffer );
+
+    /*
+        if( level >= NWIPE_LOG_WARNING )
+        {
+            vfprintf( stderr, format, ap );
+        }
+    */
+
+    /* Release the argument list. */
+    va_end( ap );
+
+    /*
+        if( level >= NWIPE_LOG_WARNING )
+        {
+            fprintf( stderr, "\n" );
+        }
+    */
+
+    /* The log file pointer. */
+    FILE* fp;
+
+    /* The log file descriptor. */
+    int fd;
+
+    if( nwipe_options.logfile[0] == '\0' )
+    {
+        if( nwipe_options.nogui )
+        {
+            printf( "%s\n", log_lines[log_current_element] );
+            log_elements_displayed++;
+        }
+    }
+    else
+    {
+        /* Open the log file for appending. */
+        fp = fopen( nwipe_options.logfile, "a" );
+
+        if( fp != NULL )
+        {
+
+            /* Get the file descriptor of the log file. */
+            fd = fileno( fp );
+
+            /* Block and lock. */
+            r = flock( fd, LOCK_EX );
+
+            if( r != 0 )
+            {
+                perror( "nwipe_log: flock:" );
+                fprintf( stderr, "nwipe_log: Unable to lock '%s' for logging.\n", nwipe_options.logfile );
+                r = pthread_mutex_unlock( &mutex1 );
+                if( r != 0 )
+                {
+                    fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+
+                    /* Unlock the file. */
+                    r = flock( fd, LOCK_UN );
+                    fclose( fp );
+                    return;
+                }
+            }
+
+            fprintf( fp, "%s\n", log_lines[log_current_element] );
+
+            /* Unlock the file. */
+            r = flock( fd, LOCK_UN );
+
+            if( r != 0 )
+            {
+                perror( "nwipe_log: flock:" );
+                fprintf( stderr, "Error: Unable to unlock '%s' after logging.\n", nwipe_options.logfile );
+            }
+
+            /* Close the stream. */
+            r = fclose( fp );
+
+            if( r != 0 )
+            {
+                perror( "nwipe_log: fclose:" );
+                fprintf( stderr, "Error: Unable to close '%s' after logging.\n", nwipe_options.logfile );
+            }
+        }
+        else
+        {
+            /* Tell user we can't create/open the log and terminate nwipe */
+            fprintf(
+                stderr, "\nERROR:Unable to create/open '%s' for logging, permissions?\n\n", nwipe_options.logfile );
+            r = pthread_mutex_unlock( &mutex1 );
+            if( r != 0 )
+            {
+                fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+            }
+            user_abort = 1;
+            terminate_signal = 1;
+            return;
+        }
+    }
+
+    log_current_element++;
+
+    r = pthread_mutex_unlock( &mutex1 );
+    if( r != 0 )
+    {
+        fprintf( stderr, "nwipe_log: pthread_mutex_unlock failed. Code %i \n", r );
+    }
+    return;
+
+} /* nwipe_log */
+
+void nwipe_perror( int nwipe_errno, const char* f, const char* s )
+{
+    /**
+     * Wrapper for perror().
+     *
+     * We may wish to tweak or squelch this later.
+     *
+     */
+
+    nwipe_log( NWIPE_LOG_ERROR, "%s: %s: %s", f, s, strerror( nwipe_errno ) );
+
+} /* nwipe_perror */
+
+void nwipe_log_OSinfo()
+{
+    /* Read /proc/version, format and write to the log */
+
+    FILE* fp = NULL;
+    char OS_info_temp[MAX_SIZE_OS_STRING + 1];
+    char OS_info[MAX_SIZE_OS_STRING + 1];
+    int idx;
+    int idx2;
+    int idx3;
+    int idx4;
+
+    /* initialise OS_info & OS_info_temp strings */
+    idx = 0;
+    while( idx < MAX_SIZE_OS_STRING + 1 )
+    {
+        OS_info_temp[idx] = 0;
+        OS_info[idx] = 0;
+        idx++;
+    }
+
+    /* Open a pipe to /proc/version for reading */
+    fp = popen( "cat /proc/version", "r" );
+    if( fp == NULL )
+    {
+        nwipe_log( NWIPE_LOG_WARNING, "Unable to create a pipe to /proc/version" );
+        return;
+    }
+
+    /* Read the OS info */
+    if( fgets( OS_info_temp, MAX_SIZE_OS_STRING, fp ) == NULL )
+    {
+        nwipe_log( NWIPE_LOG_WARNING, "fget failed to read /proc/version" );
+        fclose( fp );
+        return;
+    }
+
+    /* Format the string for the log, place on multiple lines as necessary,
+     * column aligned, left offset with n (OS_info_Line_offset) spaces */
+    idx = 0;
+    idx2 = 0;
+    idx3 = OS_info_Line_Length;
+
+    while( OS_info_temp[idx] != 0 )
+    {
+        while( idx2 < idx3 && idx2 < MAX_SIZE_OS_STRING )
+        {
+            /* remove newlines from the source */
+            if( OS_info_temp[idx] == 0x0a )
+            {
+                idx++;
+            }
+
+            /* copy the character */
+            OS_info[idx2++] = OS_info_temp[idx++];
+        }
+        if( OS_info_temp[idx] != 0 )
+        {
+            OS_info[idx2++] = 0x0a;
+            idx4 = 0;
+
+            /* left indent with spaces */
+            while( idx4 < OS_info_Line_offset && idx2 < MAX_SIZE_OS_STRING )
+            {
+                OS_info[idx2++] = ' ';
+                idx4++;
+            }
+
+            /* calculate idx3 ready for next line */
+            idx3 += OS_info_Line_offset + OS_info_Line_Length;
+        }
+        else
+        {
+            continue;
+        }
+    }
+
+    nwipe_log( NWIPE_LOG_INFO, "%s", OS_info );
+    fclose( fp );
+    return;
+}
+
+int nwipe_log_sysinfo()
+{
+    FILE* fp;
+    char path[256];
+    int len;
+    int r;  // A result buffer.
+
+    /*
+     * Remove or add keywords to be searched, depending on what information is to
+     * be logged, making sure the last entry in the array is a NULL string. To remove
+     * an entry simply comment out the keyword with //
+     */
+
+    /* The 0/1 after the keyword determines whether the data for this
+     * keyword is displayed when -q (anonymize) has been specified
+     * by the user. An quick reminder about multi dimensional arrays, the first
+     * []=the keyword (0-21) including the empty string. The second [] is the
+     * 1 or 0 value (0 or 1). The third [] is the index value into either string.
+     */
+    char dmidecode_keywords[][2][24] = {
+        { "bios-version", "1" },
+        { "bios-release-date", "1" },
+        { "system-manufacturer", "1" },
+        { "system-product-name", "1" },
+        { "system-version", "1" },
+        { "system-serial-number", "0" },
+        { "system-uuid", "0" },
+        { "baseboard-manufacturer", "1" },
+        { "baseboard-product-name", "1" },
+        { "baseboard-version", "1" },
+        { "baseboard-serial-number", "0" },
+        { "baseboard-asset-tag", "0" },
+        { "chassis-manufacturer", "1" },
+        { "chassis-type", "1" },
+        { "chassis-version", "1" },
+        { "chassis-serial-number", "0" },
+        { "chassis-asset-tag", "0" },
+        { "processor-family", "1" },
+        { "processor-manufacturer", "1" },
+        { "processor-version", "1" },
+        { "processor-frequency", "1" },
+        { "", "" }  // terminates the keyword array. DO NOT REMOVE
+    };
+
+    char dmidecode_command[] = "dmidecode -s %s";
+    char dmidecode_command2[] = "/sbin/dmidecode -s %s";
+    char dmidecode_command3[] = "/usr/bin/dmidecode -s %s";
+    char* p_dmidecode_command;
+
+    char cmd[sizeof( dmidecode_keywords ) + sizeof( dmidecode_command2 )];
+
+    unsigned int keywords_idx;
+
+    keywords_idx = 0;
+
+    p_dmidecode_command = 0;
+
+    if( system( "which dmidecode > /dev/null 2>&1" ) )
+    {
+        if( system( "which /sbin/dmidecode > /dev/null 2>&1" ) )
+        {
+            if( system( "which /usr/bin/dmidecode > /dev/null 2>&1" ) )
+            {
+                nwipe_log( NWIPE_LOG_WARNING, "Command not found. Install dmidecode !" );
+            }
+            else
+            {
+                p_dmidecode_command = &dmidecode_command3[0];
+            }
+        }
+        else
+        {
+            p_dmidecode_command = &dmidecode_command2[0];
+        }
+    }
+    else
+    {
+        p_dmidecode_command = &dmidecode_command[0];
+    }
+
+    if( p_dmidecode_command != 0 )
+    {
+
+        /* Run the dmidecode command to retrieve each dmidecode keyword, one at a time */
+        while( dmidecode_keywords[keywords_idx][0][0] != 0 )
+        {
+            sprintf( cmd, p_dmidecode_command, &dmidecode_keywords[keywords_idx][0][0] );
+            fp = popen( cmd, "r" );
+            if( fp == NULL )
+            {
+                nwipe_log( NWIPE_LOG_WARNING, "nwipe_log_sysinfo: Failed to create stream to %s", cmd );
+                return 1;
+            }
+            /* Read the output a line at a time - output it. */
+            while( fgets( path, sizeof( path ) - 1, fp ) != NULL )
+            {
+                /* Remove any trailing return from the string, as nwipe_log automatically adds a return */
+                len = strlen( path );
+                if( path[len - 1] == '\n' )
+                {
+                    path[len - 1] = 0;
+                }
+                if( nwipe_options.quiet )
+                {
+                    if( *( &dmidecode_keywords[keywords_idx][1][0] ) == '0' )
+                    {
+                        nwipe_log(
+                            NWIPE_LOG_NOTICE, "%s = %s", &dmidecode_keywords[keywords_idx][0][0], "XXXXXXXXXXXXXXX" );
+                    }
+                    else
+                    {
+                        nwipe_log( NWIPE_LOG_NOTICE, "%s = %s", &dmidecode_keywords[keywords_idx][0][0], path );
+                    }
+                }
+                else
+                {
+                    nwipe_log( NWIPE_LOG_NOTICE, "%s = %s", &dmidecode_keywords[keywords_idx][0][0], path );
+                }
+            }
+            /* close */
+            r = pclose( fp );
+            if( r > 0 )
+            {
+                nwipe_log( NWIPE_LOG_WARNING,
+                           "nwipe_log_sysinfo(): dmidecode failed, \"%s\" exit status = %u",
+                           cmd,
+                           WEXITSTATUS( r ) );
+                return 1;
+            }
+            keywords_idx++;
+        }
+    }
+    return 0;
+}
+
+void nwipe_log_summary( nwipe_context_t** ptr, int nwipe_selected )
+{
+    /* Prints two summary tables, the first is the device pass and verification summary
+     * and the second is the main summary table detaining the drives, status, throughput,
+     * model and serial number */
+    int i;
+    int idx_src;
+    int idx_dest;
+    char device[18];
+    char status[9];
+    char throughput[13];
+    char total_throughput_string[13];
+    char summary_top_border[256];
+    char summary_top_column_titles[256];
+    char blank[3];
+    char verify[3];
+    // char duration[5];
+    char duration[314];
+    char model[18];
+    char serial_no[20];
+    char exclamation_flag[2];
+    int hours;
+    int minutes;
+    int seconds;
+    u64 total_duration_seconds;
+    u64 total_throughput;
+    nwipe_context_t** c;
+    c = ptr;
+
+    exclamation_flag[0] = 0;
+    device[0] = 0;
+    status[0] = 0;
+    throughput[0] = 0;
+    summary_top_border[0] = 0;
+    summary_top_column_titles[0] = 0;
+    blank[0] = 0;
+    verify[0] = 0;
+    duration[0] = 0;
+    model[0] = 0;
+    serial_no[0] = 0;
+    hours = 0;
+    minutes = 0;
+    seconds = 0;
+
+    /* A time buffer. */
+    time_t t;
+
+    /* A pointer to the system time struct. */
+    struct tm* p;
+
+    /* Nothing to do, user never started a wipe so no summary table required. */
+    if( global_wipe_status == 0 )
+    {
+        return;
+    }
+
+    /* Print the pass and verifications table */
+
+    /* IMPORTANT: Keep maximum columns (line length) to 80 characters for use with 80x30 terminals, Shredos, ALT-F2 etc
+     * --------------------------------01234567890123456789012345678901234567890123456789012345678901234567890123456789-*/
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP, "" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "******************************** Error Summary *********************************" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP, "!   Device | Pass Errors | Verifications Errors | Fdatasync I\\O Errors" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "--------------------------------------------------------------------------------" );
+
+    for( i = 0; i < nwipe_selected; i++ )
+    {
+        if( c[i]->pass_errors != 0 || c[i]->verify_errors != 0 || c[i]->fsyncdata_errors != 0 )
+        {
+            strncpy( exclamation_flag, "!", 1 );
+            exclamation_flag[1] = 0;
+        }
+        else
+        {
+            strncpy( exclamation_flag, " ", 1 );
+            exclamation_flag[1] = 0;
+        }
+
+        /* Device name, strip any prefixed /dev/.. leaving up to 6 right justified
+         * characters eg "   sda", prefixed with space to 6 characters, note that
+         * we are processing the strings right to left */
+
+        idx_dest = 6;
+        device[idx_dest--] = 0;
+        idx_src = strlen( c[i]->device_name );
+        idx_src--;
+
+        nwipe_strip_path( device, c[i]->device_name );
+
+        nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+                   "%s %s |  %10llu |           %10llu |           %10llu",
+                   exclamation_flag,
+                   device,
+                   c[i]->pass_errors,
+                   c[i]->verify_errors,
+                   c[i]->fsyncdata_errors );
+    }
+
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "********************************************************************************" );
+
+    /* Print the main summary table */
+
+    /* initialise */
+    total_throughput = 0;
+
+    /* Get the current time. */
+    t = time( NULL );
+    p = localtime( &t );
+    /* IMPORTANT: Keep maximum columns (line length) to 80 characters for use with 80x30 terminals, Shredos, ALT-F2 etc
+     * --------------------------------01234567890123456789012345678901234567890123456789012345678901234567890123456789-*/
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP, "" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "********************************* Drive Status *********************************" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP, "!   Device | Status | Thru-put | HH:MM:SS | Model/Serial Number" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "--------------------------------------------------------------------------------" );
+    /* Example layout:
+     *    "!     sdb |--FAIL--|  120MB/s | 01:22:01 | WD6788.8488YNHj/ZX677888388-N       "
+     * ); "      sdc | Erased |  120MB/s | 01:25:04 | WD6784.8488JKGG/ZX677888388-N       " ); "     sdv | Erased |
+     * 120MB/s | 01:19:07 | WD6788.848HHDDR/ZX677888388-N       " ); End of Example layout */
+
+    for( i = 0; i < nwipe_selected; i++ )
+    {
+        /* Device name, strip any prefixed /dev/.. leaving up to 8 right justified
+         * characters eg "   sda", prefixed with space to 8 characters, note that
+         * we are processing the strings right to left */
+
+        nwipe_strip_path( device, c[i]->device_name );
+
+        extern int user_abort;
+
+        /* Any errors ? if so set the exclamation_flag and fail message,
+         * All status messages should be eight characters EXACTLY !
+         */
+        if( c[i]->pass_errors != 0 || c[i]->verify_errors != 0 || c[i]->fsyncdata_errors != 0 )
+        {
+            strncpy( exclamation_flag, "!", 1 );
+            exclamation_flag[1] = 0;
+
+            strncpy( status, "-FAILED-", 8 );
+            status[8] = 0;
+        }
+        else
+        {
+            if( c[i]->wipe_status == 0 )
+            {
+                strncpy( exclamation_flag, " ", 1 );
+                exclamation_flag[1] = 0;
+
+                strncpy( status, " Erased ", 8 );
+                status[8] = 0;
+            }
+            else
+            {
+                if( user_abort == 1 )
+                {
+                    strncpy( exclamation_flag, "!", 1 );
+                    exclamation_flag[1] = 0;
+
+                    strncpy( status, "UABORTED", 8 );
+                    status[8] = 0;
+                }
+                else
+                {
+                    /* If this ever happens, there is a bug ! */
+                    strncpy( exclamation_flag, " ", 1 );
+                    exclamation_flag[1] = 0;
+
+                    strncpy( status, "INSANITY", 8 );
+                    status[8] = 0;
+                }
+            }
+        }
+
+        /* Determine the size of throughput so that the correct nomenclature can be used */
+        Determine_C_B_nomenclature( c[i]->throughput, throughput, 13 );
+
+        /* Add this devices throughput to the total throughput */
+        total_throughput += c[i]->throughput;
+
+        /* Retrieve the duration of the wipe in seconds and convert to hours and minutes and seconds */
+
+        if( c[i]->start_time != 0 && c[i]->end_time != 0 )
+        {
+            /* For a summary when the wipe has finished */
+            c[i]->duration = difftime( c[i]->end_time, c[i]->start_time );
+        }
+        else
+        {
+            if( c[i]->start_time != 0 && c[i]->end_time == 0 )
+            {
+                /* For a summary in the event of a system shutdown */
+                c[i]->duration = difftime( t, c[i]->start_time );
+            }
+        }
+
+        total_duration_seconds = (u64) c[i]->duration;
+
+        /* Convert binary seconds into three binary variables, hours, minutes and seconds */
+        convert_seconds_to_hours_minutes_seconds( total_duration_seconds, &hours, &minutes, &seconds );
+
+        /* Device Model */
+        strncpy( model, c[i]->device_model, 17 );
+        model[17] = 0;
+
+        /* Serial No. */
+        strncpy( serial_no, c[i]->device_serial_no, 20 );
+        model[17] = 0;
+
+        nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+                   "%s %s |%s| %s/s | %02i:%02i:%02i | %s/%s",
+                   exclamation_flag,
+                   device,
+                   status,
+                   throughput,
+                   hours,
+                   minutes,
+                   seconds,
+                   model,
+                   serial_no );
+    }
+
+    /* Determine the size of throughput so that the correct nomenclature can be used */
+    Determine_C_B_nomenclature( total_throughput, total_throughput_string, 13 );
+
+    /* Blank abbreviations used in summary table B=blank, NB=no blank */
+    if( nwipe_options.noblank )
+    {
+        strcpy( blank, "NB" );
+    }
+    else
+    {
+        strcpy( blank, "B" );
+    }
+
+    /* Verify abbreviations used in summary table */
+    switch( nwipe_options.verify )
+    {
+        case NWIPE_VERIFY_NONE:
+            strcpy( verify, "NV" );
+            break;
+
+        case NWIPE_VERIFY_LAST:
+            strcpy( verify, "VL" );
+            break;
+
+        case NWIPE_VERIFY_ALL:
+            strcpy( verify, "VA" );
+            break;
+    }
+
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "--------------------------------------------------------------------------------" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "[%i/%02i/%02i %02i:%02i:%02i] Total Throughput %s/s, %s, %iR+%s+%s",
+               1900 + p->tm_year,
+               1 + p->tm_mon,
+               p->tm_mday,
+               p->tm_hour,
+               p->tm_min,
+               p->tm_sec,
+               total_throughput_string,
+               nwipe_method_label( nwipe_options.method ),
+               nwipe_options.rounds,
+               blank,
+               verify );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP,
+               "********************************************************************************" );
+    nwipe_log( NWIPE_LOG_NOTIMESTAMP, "" );
+}
+
+void Determine_C_B_nomenclature( u64 speed, char* result, int result_array_size )
+{
+
+    /* C_B ? Determine Capacity or Bandwidth nomenclature
+     *
+     * A pointer to a result character string with a minimum of 13 characters in length
+     * should be provided.
+     *
+     * Outputs a string of the form xxxTB/s, xxxGB/s, xxxMB/s, xxxKB/s B/s depending on the value of 'speed'
+     */
+
+    /* Initialise the output array */
+    int idx = 0;
+
+    while( idx < result_array_size )
+    {
+        result[idx++] = 0;
+    }
+
+    /* Determine the size of throughput so that the correct nomenclature can be used */
+    if( speed >= INT64_C( 1000000000000 ) )
+    {
+        snprintf( result, result_array_size, "%3llu TB", speed / INT64_C( 1000000000000 ) );
+    }
+    else if( speed >= INT64_C( 1000000000 ) )
+    {
+        snprintf( result, result_array_size, "%3llu GB", speed / INT64_C( 1000000000 ) );
+    }
+    else if( speed >= INT64_C( 1000000 ) )
+    {
+        snprintf( result, result_array_size, "%3llu MB", speed / INT64_C( 1000000 ) );
+    }
+    else if( speed >= INT64_C( 1000 ) )
+    {
+        snprintf( result, result_array_size, "%3llu KB", speed / INT64_C( 1000 ) );
+    }
+    else
+    {
+        snprintf( result, result_array_size, "%3llu B", speed / INT64_C( 1 ) );
+    }
+}
+
+void convert_seconds_to_hours_minutes_seconds( u64 total_seconds, int* hours, int* minutes, int* seconds )
+{
+    /* Convert binary seconds into binary hours, minutes and seconds */
+
+    if( total_seconds % 60 )
+    {
+        *minutes = total_seconds / 60;
+
+        *seconds = total_seconds - ( *minutes * 60 );
+    }
+    else
+    {
+        *minutes = total_seconds / 60;
+
+        *seconds = 0;
+    }
+    if( *minutes > 59 )
+    {
+        *hours = *minutes / 60;
+        if( *minutes % 60 )
+        {
+            *minutes = *minutes - ( *hours * 60 );
+        }
+        else
+        {
+            *minutes = 0;
+        }
+    }
+}
+
+int nwipe_strip_path( char* output, char* input )
+{
+    /* Take the input string, say "/dev/sda" and remove the "/dev/", prefix the result
+     * with 'length' spaces. So if length=8 and input=/dev/sda, output will
+     * be "     sda", a string 8 characters long right justified with spaces.
+     */
+    int idx_dest;
+    int idx_src;
+    idx_dest = 8;
+    // idx_dest = length;
+    output[idx_dest--] = 0;
+    idx_src = strlen( input );
+    idx_src--;
+
+    while( idx_dest >= 0 )
+    {
+        /* if the device name contains a / start prefixing spaces */
+        if( input[idx_src] == '/' )
+        {
+            output[idx_dest--] = ' ';
+            continue;
+        }
+        if( idx_src >= 0 )
+        {
+            output[idx_dest--] = input[idx_src--];
+        }
+    }
+}
diff --git a/src/logging.h b/src/logging.h
new file mode 100644
index 0000000..b2d4b75
--- /dev/null
+++ b/src/logging.h
@@ -0,0 +1,52 @@
+/*
+ *  logging.c:  Logging facilities for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LOGGING_H_
+#define LOGGING_H_
+
+/* Maximum size of a log message */
+#define MAX_LOG_LINE_CHARS 512
+
+#define MAX_SIZE_OS_STRING 512 /* Maximum size of acceptable OS string */
+#define OS_info_Line_offset 31 /* OS_info line offset in log */
+#define OS_info_Line_Length 48 /* OS_info line length */
+
+typedef enum nwipe_log_t_ {
+    NWIPE_LOG_NONE = 0,
+    NWIPE_LOG_DEBUG,  // TODO:  Very verbose logging.
+    NWIPE_LOG_INFO,  // TODO:  Verbose logging.
+    NWIPE_LOG_NOTICE,  // Most logging happens at this level.
+    NWIPE_LOG_WARNING,  // Things that the user should know about.
+    NWIPE_LOG_ERROR,  // Non-fatal errors that result in failure.
+    NWIPE_LOG_FATAL,  // Errors that cause the program to exit.
+    NWIPE_LOG_SANITY,  // Programming errors.
+    NWIPE_LOG_NOTIMESTAMP  // logs the message without the timestamp
+} nwipe_log_t;
+
+void nwipe_log( nwipe_log_t level, const char* format, ... );
+void nwipe_perror( int nwipe_errno, const char* f, const char* s );
+void nwipe_log_OSinfo();
+int nwipe_log_sysinfo();
+void nwipe_log_summary( nwipe_context_t**, int );  // This produces the wipe status table on exit
+void Determine_C_B_nomenclature( u64, char*, int );
+void convert_seconds_to_hours_minutes_seconds( u64, int*, int*, int* );
+int nwipe_strip_path( char*, char* );
+
+#endif /* LOGGING_H_ */
diff --git a/src/method.c b/src/method.c
new file mode 100644
index 0000000..5f5f298
--- /dev/null
+++ b/src/method.c
@@ -0,0 +1,1375 @@
+/*
+ *  method.c: Method implementations for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* HOWTO:  Add another wipe method.
+ *
+ *  1.  Create a new function here and add the prototype to the 'method.h' file.
+ *  2.  Update nwipe_method_label() appropriately.
+ *  3.  Put the passes that you wish to run into a nwipe_pattern_t array.
+ *  4.  Call nwipe_runmethod() with your array of patterns.
+ *  5.  Copy-and-paste within the 'options.c' file so that the new method can be invoked.
+ *  6.  Optionally try to plug your function into 'gui.c'.
+ *  7.  Update the function 'calculate_round_size()' with the new method.
+ *
+ *
+ * WARNING: Remember to pad all pattern arrays with { 0, NULL }.
+ *
+ * WARNING: Never change nwipe_options after calling a method.
+ *
+ * NOTE: The nwipe_runmethod function appends a user selectable final blanking (zero) pass to all methods.
+ *
+ */
+
+#include <stdint.h>
+
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "prng.h"
+#include "options.h"
+#include "pass.h"
+#include "logging.h"
+
+/*
+ * Comment Legend
+ *
+ *   "method"  An ordered set of patterns.
+ *   "pattern" The magic bits that will be written to a device.
+ *   "pass"    Reading or writing one pattern to an entire device.
+ *   "rounds"  The number of times that a method will be applied to a device.
+ *
+ */
+
+const char* nwipe_dod522022m_label = "DoD 5220.22-M";
+const char* nwipe_dodshort_label = "DoD Short";
+const char* nwipe_gutmann_label = "Gutmann Wipe";
+const char* nwipe_ops2_label = "RCMP TSSIT OPS-II";
+const char* nwipe_random_label = "PRNG Stream";
+const char* nwipe_zero_label = "Fill With Zeros";
+const char* nwipe_one_label = "Fill With Ones";
+const char* nwipe_verify_zero_label = "Verify Zeros (0x00)";
+const char* nwipe_verify_one_label = "Verify Ones  (0xFF)";
+const char* nwipe_is5enh_label = "HMG IS5 Enhanced";
+
+const char* nwipe_unknown_label = "Unknown Method (FIXME)";
+
+const char* nwipe_method_label( void* method )
+{
+    /**
+     *  Returns a pointer to the name of the method function.
+     *
+     */
+
+    if( method == &nwipe_dod522022m )
+    {
+        return nwipe_dod522022m_label;
+    }
+    if( method == &nwipe_dodshort )
+    {
+        return nwipe_dodshort_label;
+    }
+    if( method == &nwipe_gutmann )
+    {
+        return nwipe_gutmann_label;
+    }
+    if( method == &nwipe_ops2 )
+    {
+        return nwipe_ops2_label;
+    }
+    if( method == &nwipe_random )
+    {
+        return nwipe_random_label;
+    }
+    if( method == &nwipe_zero )
+    {
+        return nwipe_zero_label;
+    }
+    if( method == &nwipe_one )
+    {
+        return nwipe_one_label;
+    }
+    if( method == &nwipe_verify_zero )
+    {
+        return nwipe_verify_zero_label;
+    }
+    if( method == &nwipe_verify_one )
+    {
+        return nwipe_verify_one_label;
+    }
+    if( method == &nwipe_is5enh )
+    {
+        return nwipe_is5enh_label;
+    }
+
+    /* else */
+    return nwipe_unknown_label;
+
+} /* nwipe_method_label */
+
+void* nwipe_zero( void* ptr )
+{
+    /**
+     * Fill the device with zeroes.
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* setup for a zero-fill. */
+
+    char zerofill[1] = { '\x00' };
+    nwipe_pattern_t patterns[] = { { 1, &zerofill[0] },  // pass 1: 0s
+                                   { 0, NULL } };
+
+    /* Run the method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_zero */
+
+void* nwipe_one( void* ptr )
+{
+    /**
+     * Fill the device with ones.
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* setup for a zero-fill. */
+
+    char onefill[1] = { '\xFF' };
+    nwipe_pattern_t patterns[] = { { 1, &onefill[0] },  // pass 1: 1s
+                                   { 0, NULL } };
+
+    /* Run the method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_one */
+
+void* nwipe_verify_zero( void* ptr )
+{
+    /**
+     * Verify the device is full of zeros.
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* Do nothing because nwipe_runmethod appends a zero-fill. */
+    nwipe_pattern_t patterns[] = { { 0, NULL } };
+
+    /* Run the method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_verify zeros */
+
+void* nwipe_verify_one( void* ptr )
+{
+    /**
+     * Verify the device is full of ones.
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* Do nothing because nwipe_runmethod appends a zero-fill. */
+    nwipe_pattern_t patterns[] = { { 0, NULL } };
+
+    /* Run the method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_verify */
+
+void* nwipe_dod522022m( void* ptr )
+{
+    /**
+     * United States Department of Defense 5220.22-M standard wipe.
+     *
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* A result holder. */
+    int r;
+
+    /* Random characters. (Elements 2 and 6 are unused.) */
+    char dod[7];
+
+    nwipe_pattern_t patterns[] = { { 1, &dod[0] },  // Pass 1: A random character.
+                                   { 1, &dod[1] },  // Pass 2: The bitwise complement of pass 1.
+                                   { -1, "" },  // Pass 3: A random stream.
+                                   { 1, &dod[3] },  // Pass 4: A random character.
+                                   { 1, &dod[4] },  // Pass 5: A random character.
+                                   { 1, &dod[5] },  // Pass 6: The bitwise complement of pass 5.
+                                   { -1, "" },  // Pass 7: A random stream.
+                                   { 0, NULL } };
+
+    /* Load the array with random characters. */
+    r = read( c->entropy_fd, &dod, sizeof( dod ) );
+
+    /* NOTE: Only the random data in dod[0], dod[3], and dod[4] is actually used. */
+
+    /* Check the result. */
+    if( r != sizeof( dod ) )
+    {
+        r = errno;
+        nwipe_perror( r, __FUNCTION__, "read" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to seed the %s method.", nwipe_dod522022m_label );
+
+        /* Ensure a negative return. */
+        if( r < 0 )
+        {
+            c->result = r;
+            return NULL;
+        }
+        else
+        {
+            c->result = -1;
+            return NULL;
+        }
+    }
+
+    /* Pass 2 is the bitwise complement of Pass 1. */
+    dod[1] = ~dod[0];
+
+    /* Pass 4 is the bitwise complement of Pass 3. */
+    dod[5] = ~dod[4];
+
+    /* Run the DoD 5220.22-M method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_dod522022m */
+
+void* nwipe_dodshort( void* ptr )
+{
+    /**
+     * United States Department of Defense 5220.22-M short wipe.
+     * This method is comprised of passes 1,2,7 from the standard wipe.
+     *
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* A result holder. */
+    int r;
+
+    /* Random characters. (Element 3 is unused.) */
+    char dod[3];
+
+    nwipe_pattern_t patterns[] = { { 1, &dod[0] },  // Pass 1: A random character.
+                                   { 1, &dod[1] },  // Pass 2: The bitwise complement of pass 1.
+                                   { -1, "" },  // Pass 3: A random stream.
+                                   { 0, NULL } };
+
+    /* Load the array with random characters. */
+    r = read( c->entropy_fd, &dod, sizeof( dod ) );
+
+    /* NOTE: Only the random data in dod[0] is actually used. */
+
+    /* Check the result. */
+    if( r != sizeof( dod ) )
+    {
+        r = errno;
+        nwipe_perror( r, __FUNCTION__, "read" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to seed the %s method.", nwipe_dodshort_label );
+
+        /* Ensure a negative return. */
+        if( r < 0 )
+        {
+            c->result = r;
+            return NULL;
+        }
+        else
+        {
+            c->result = -1;
+            return NULL;
+        }
+    }
+
+    /* Pass 2 is the bitwise complement of Pass 1. */
+    dod[1] = ~dod[0];
+
+    /* Run the DoD 5220.022-M short method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_dodshort */
+
+void* nwipe_gutmann( void* ptr )
+{
+    /**
+     * Peter Gutmann's wipe.
+     *
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* Define the Gutmann method. */
+    nwipe_pattern_t book[] = { { -1, "" },  // Random pass.
+                               { -1, "" },  // Random pass.
+                               { -1, "" },  // Random pass.
+                               { -1, "" },  // Random pass.
+                               { 3, "\x55\x55\x55" },  // Static pass: 0x555555  01010101 01010101 01010101
+                               { 3, "\xAA\xAA\xAA" },  // Static pass: 0XAAAAAA  10101010 10101010 10101010
+                               { 3, "\x92\x49\x24" },  // Static pass: 0x924924  10010010 01001001 00100100
+                               { 3, "\x49\x24\x92" },  // Static pass: 0x492492  01001001 00100100 10010010
+                               { 3, "\x24\x92\x49" },  // Static pass: 0x249249  00100100 10010010 01001001
+                               { 3, "\x00\x00\x00" },  // Static pass: 0x000000  00000000 00000000 00000000
+                               { 3, "\x11\x11\x11" },  // Static pass: 0x111111  00010001 00010001 00010001
+                               { 3, "\x22\x22\x22" },  // Static pass: 0x222222  00100010 00100010 00100010
+                               { 3, "\x33\x33\x33" },  // Static pass: 0x333333  00110011 00110011 00110011
+                               { 3, "\x44\x44\x44" },  // Static pass: 0x444444  01000100 01000100 01000100
+                               { 3, "\x55\x55\x55" },  // Static pass: 0x555555  01010101 01010101 01010101
+                               { 3, "\x66\x66\x66" },  // Static pass: 0x666666  01100110 01100110 01100110
+                               { 3, "\x77\x77\x77" },  // Static pass: 0x777777  01110111 01110111 01110111
+                               { 3, "\x88\x88\x88" },  // Static pass: 0x888888  10001000 10001000 10001000
+                               { 3, "\x99\x99\x99" },  // Static pass: 0x999999  10011001 10011001 10011001
+                               { 3, "\xAA\xAA\xAA" },  // Static pass: 0xAAAAAA  10101010 10101010 10101010
+                               { 3, "\xBB\xBB\xBB" },  // Static pass: 0xBBBBBB  10111011 10111011 10111011
+                               { 3, "\xCC\xCC\xCC" },  // Static pass: 0xCCCCCC  11001100 11001100 11001100
+                               { 3, "\xDD\xDD\xDD" },  // Static pass: 0xDDDDDD  11011101 11011101 11011101
+                               { 3, "\xEE\xEE\xEE" },  // Static pass: 0xEEEEEE  11101110 11101110 11101110
+                               { 3, "\xFF\xFF\xFF" },  // Static pass: 0xFFFFFF  11111111 11111111 11111111
+                               { 3, "\x92\x49\x24" },  // Static pass: 0x924924  10010010 01001001 00100100
+                               { 3, "\x49\x24\x92" },  // Static pass: 0x492492  01001001 00100100 10010010
+                               { 3, "\x24\x92\x49" },  // Static pass: 0x249249  00100100 10010010 01001001
+                               { 3, "\x6D\xB6\xDB" },  // Static pass: 0x6DB6DB  01101101 10110110 11011011
+                               { 3, "\xB6\xDB\x6D" },  // Static pass: 0xB6DB6D  10110110 11011011 01101101
+                               { 3, "\xDB\x6D\xB6" },  // Static pass: 0XDB6DB6  11011011 01101101 10110110
+                               { -1, "" },  // Random pass.
+                               { -1, "" },  // Random pass.
+                               { -1, "" },  // Random pass.
+                               { -1, "" },  // Random pass.
+                               { 0, NULL } };
+
+    /* Put the book array into this array in random order. */
+    nwipe_pattern_t patterns[36];
+
+    /* An entropy buffer. */
+    u16 s[27];
+
+    /* Load the array with random characters. */
+    ssize_t r = read( c->entropy_fd, &s, sizeof( s ) );
+    if( r != sizeof( s ) )
+    {
+        r = errno;
+        nwipe_perror( r, __FUNCTION__, "read" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to seed the %s method.", nwipe_gutmann_label );
+
+        /* Ensure a negative return. */
+        if( r < 0 )
+        {
+            c->result = r;
+            return NULL;
+        }
+        else
+        {
+            c->result = -1;
+            return NULL;
+        }
+    }
+
+    // First 4 random passes
+    for( int i = 0; i <= 3; ++i )
+    {
+        patterns[i] = book[i];
+    }
+    // Middle 27 passes in random order
+    for( int i = 26; i >= 0; --i )
+    {
+        /* Get a random integer that is less than the first index 'i'. */
+        int n = (int) ( (double) ( s[i] ) / (double) ( 0x0000FFFF + 1 ) * (double) ( i + 1 ) );
+
+        /* Initialize the secondary index. */
+        int j = 3;
+
+        while( n-- >= 0 )
+        {
+            /* Advance 'j' by 'n' positions... */
+            j += 1;
+
+            /* ... but don't count 'book' elements that have already been copied. */
+            while( book[j].length == 0 )
+            {
+                j += 1;
+            }
+        }
+
+        /* Copy the element. */
+        patterns[i + 4] = book[j];
+
+        /* Mark this element as having been used. */
+        book[j].length = 0;
+    }
+    // Last 4 random passes
+    for( int i = 31; i <= 34; ++i )
+    {
+        patterns[i] = book[i];
+    }
+
+    /* Ensure that the array is terminated. */
+    patterns[35].length = 0;
+    patterns[35].s = NULL;
+
+    /* Run the Gutmann method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_gutmann */
+
+void* nwipe_ops2( void* ptr )
+{
+    /**
+     *  Royal Canadian Mounted Police
+     *  Technical Security Standard for Information Technology
+     *  Appendix OPS-II: Media Sanitization
+     *
+     *  NOTE: The last pass of this method is specially handled by nwipe_runmethod.
+     *
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* A generic array index. */
+    int i;
+
+    /* A generic result buffer. */
+    int r;
+
+    /* A buffer for random characters. */
+    char* s;
+
+    /* A buffer for the bitwise complements of 's'. */
+    char* t;
+
+    /* The element count of 's' and 't'. */
+    u32 u;
+
+    /* The pattern array for this method is dynamically allocated. */
+    nwipe_pattern_t* patterns;
+
+    /* The element count of 'patterns'. */
+    u32 q;
+
+    /* We need one random character per round. */
+    u = 1 * nwipe_options.rounds;
+
+    /* Allocate the array of random characters. */
+    s = malloc( sizeof( char ) * u );
+
+    if( s == NULL )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate the random character array." );
+        c->result = -1;
+        return NULL;
+    }
+
+    /* Allocate the array of complement characters. */
+    t = malloc( sizeof( char ) * u );
+
+    if( t == NULL )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate the complement character array." );
+        c->result = -1;
+        free( s );
+        return NULL;
+    }
+
+    /* We need eight pattern elements per round, plus one for padding. */
+    q = 8 * u + 1;
+
+    /* Allocate the pattern array. */
+    patterns = malloc( sizeof( nwipe_pattern_t ) * q );
+
+    if( patterns == NULL )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate the pattern array." );
+        c->result = -1;
+        free( s );
+        free( t );
+        return NULL;
+    }
+
+    /* Load the array of random characters. */
+    r = read( c->entropy_fd, s, u );
+
+    if( r != u )
+    {
+        r = errno;
+        nwipe_perror( r, __FUNCTION__, "read" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to seed the %s method.", nwipe_ops2_label );
+
+        if( r < 0 )
+        {
+            c->result = r;
+            free( s );
+            free( t );
+            free( patterns );
+            return NULL;
+        }
+        else
+        {
+            c->result = -1;
+            free( s );
+            free( t );
+            free( patterns );
+            return NULL;
+        }
+    }
+
+    for( i = 0; i < u; i += 1 )
+    {
+        /* Populate the array of complements. */
+        t[i] = ~s[i];
+    }
+
+    for( i = 0; i < u; i += 8 )
+    {
+        /* Populate the array of patterns. */
+
+        /* Even elements point to the random characters. */
+        patterns[i * 4 + 0].length = 1;
+        patterns[i * 4 + 0].s = &s[i];
+        patterns[i * 4 + 2].length = 1;
+        patterns[i * 4 + 2].s = &s[i];
+        patterns[i * 4 + 4].length = 1;
+        patterns[i * 4 + 4].s = &s[i];
+        patterns[i * 4 + 6].length = 1;
+        patterns[i * 4 + 6].s = &s[i];
+
+        /* Odd elements point to the complement characters. */
+        patterns[i * 4 + 1].length = 1;
+        patterns[i * 4 + 1].s = &t[i];
+        patterns[i * 4 + 3].length = 1;
+        patterns[i * 4 + 3].s = &t[i];
+        patterns[i * 4 + 5].length = 1;
+        patterns[i * 4 + 5].s = &t[i];
+        patterns[i * 4 + 7].length = 1;
+        patterns[i * 4 + 7].s = &t[i];
+    }
+
+    /* Ensure that the array is terminated. */
+    patterns[q - 1].length = 0;
+    patterns[q - 1].s = NULL;
+
+    /* Run the TSSIT OPS-II method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Release the random character buffer. */
+    free( s );
+
+    /* Release the complement character buffer */
+    free( t );
+
+    /* Release the pattern buffer. */
+    free( patterns );
+
+    /* We're done. */
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_ops2 */
+
+void* nwipe_is5enh( void* ptr )
+{
+    nwipe_context_t* c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    c->wipe_status = 1;
+
+    char is5enh[3] = { '\x00', '\xFF', '\x00' };
+    nwipe_pattern_t patterns[] = { { 1, &is5enh[0] },  // Pass 1: 0s
+                                   { 1, &is5enh[1] },  // Pass 2: 1s
+                                   { -1, &is5enh[2] },  // Pass 3: random bytes with verification
+                                   { 0, NULL } };
+    c->result = nwipe_runmethod( c, patterns );
+
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_is5enh */
+
+void* nwipe_random( void* ptr )
+{
+    /**
+     * Fill the device with a stream from the PRNG.
+     *
+     */
+
+    nwipe_context_t* c;
+    c = (nwipe_context_t*) ptr;
+
+    /* get current time at the start of the wipe  */
+    time( &c->start_time );
+
+    /* set wipe in progress flag for GUI */
+    c->wipe_status = 1;
+
+    /* Define the random method. */
+    nwipe_pattern_t patterns[] = { { -1, "" }, { 0, NULL } };
+
+    /* Run the method. */
+    c->result = nwipe_runmethod( c, patterns );
+
+    /* Finished. Set the wipe_status flag so that the GUI knows */
+    c->wipe_status = 0;
+
+    /* get current time at the end of the wipe  */
+    time( &c->end_time );
+
+    return NULL;
+} /* nwipe_random */
+
+int nwipe_runmethod( nwipe_context_t* c, nwipe_pattern_t* patterns )
+{
+    /**
+     * Writes patterns to the device.
+     *
+     */
+
+    /* The result holder. */
+    int r;
+
+    /* An index variable. */
+    int i = 0;
+
+    /* Variable to track if it is the last pass */
+    int lastpass = 0;
+
+    i = 0;
+
+    /* The zero-fill pattern for the final pass of most methods. */
+    nwipe_pattern_t pattern_zero = { 1, "\x00" };
+
+    /* The one-fill pattern for verification of the ones fill */
+    nwipe_pattern_t pattern_one = { 1, "\xFF" };
+
+    /* Create the PRNG state buffer. */
+    c->prng_seed.length = NWIPE_KNOB_PRNG_STATE_LENGTH;
+    c->prng_seed.s = malloc( c->prng_seed.length );
+
+    /* Check the memory allocation. */
+    if( !c->prng_seed.s )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the prng seed buffer." );
+        return -1;
+    }
+
+    /* Count the number of patterns in the array. */
+    while( patterns[i].length )
+    {
+        i += 1;
+    }
+
+    /* Tell the parent the number of device passes that will be run in one round. */
+    c->pass_count = i;
+
+    /* Set the number of bytes that will be written across all passes in one round. */
+    c->pass_size = c->pass_count * c->device_size;
+
+    /* For the selected method, calculate the correct round_size value (for correct percentage calculation) */
+    calculate_round_size( c );
+
+    /* If only verifying then the round size is the device size */
+    if( nwipe_options.method == &nwipe_verify_zero || nwipe_options.method == &nwipe_verify_one )
+    {
+        c->round_size = c->device_size;
+    }
+
+    /* Initialize the working round counter. */
+    c->round_working = 0;
+
+    nwipe_log(
+        NWIPE_LOG_NOTICE, "Invoking method '%s' on %s", nwipe_method_label( nwipe_options.method ), c->device_name );
+
+    while( c->round_working < c->round_count )
+    {
+        /* Increment the round counter. */
+        c->round_working += 1;
+
+        nwipe_log(
+            NWIPE_LOG_NOTICE, "Starting round %i of %i on %s", c->round_working, c->round_count, c->device_name );
+
+        /* Initialize the working pass counter. */
+        c->pass_working = 0;
+
+        for( i = 0; i < c->pass_count; i++ )
+        {
+            /* Increment the working pass. */
+            c->pass_working += 1;
+
+            /* Check if this is the last pass. */
+            if( nwipe_options.verify == NWIPE_VERIFY_LAST && nwipe_options.method != &nwipe_ops2 )
+            {
+                if( nwipe_options.noblank == 1 && c->round_working == c->round_count
+                    && c->pass_working == c->pass_count )
+                {
+                    lastpass = 1;
+                }
+            }
+
+            nwipe_log( NWIPE_LOG_NOTICE,
+                       "Starting pass %i/%i, round %i/%i, on %s",
+                       c->pass_working,
+                       c->pass_count,
+                       c->round_working,
+                       c->round_count,
+                       c->device_name );
+
+            if( patterns[i].length == 0 )
+            {
+                /* Caught insanity. */
+                nwipe_log( NWIPE_LOG_SANITY, "nwipe_runmethod: A non-terminating pattern element has zero length." );
+                return -1;
+            }
+
+            if( patterns[i].length > 0 )
+            {
+
+                /* Write a static pass. */
+                c->pass_type = NWIPE_PASS_WRITE;
+                r = nwipe_static_pass( c, &patterns[i] );
+                c->pass_type = NWIPE_PASS_NONE;
+
+                /* Log number of bytes written to disk */
+                nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes written to %s", c->pass_done, c->device_name );
+
+                /* Check for a fatal error. */
+                if( r < 0 )
+                {
+                    return r;
+                }
+
+                if( nwipe_options.verify == NWIPE_VERIFY_ALL || lastpass == 1 )
+                {
+
+                    nwipe_log( NWIPE_LOG_NOTICE,
+                               "Verifying pass %i of %i, round %i of %i, on %s",
+                               c->pass_working,
+                               c->pass_count,
+                               c->round_working,
+                               c->round_count,
+                               c->device_name );
+
+                    /* Verify this pass. */
+                    c->pass_type = NWIPE_PASS_VERIFY;
+                    r = nwipe_static_verify( c, &patterns[i] );
+                    c->pass_type = NWIPE_PASS_NONE;
+
+                    nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes read from %s", c->pass_done, c->device_name );
+
+                    /* Check for a fatal error. */
+                    if( r < 0 )
+                    {
+                        return r;
+                    }
+
+                    nwipe_log( NWIPE_LOG_NOTICE,
+                               "Verified pass %i of %i, round %i of %i, on '%s'.",
+                               c->pass_working,
+                               c->pass_count,
+                               c->round_working,
+                               c->round_count,
+                               c->device_name );
+                }
+
+            } /* static pass */
+
+            else
+            {
+                c->pass_type = NWIPE_PASS_WRITE;
+
+                /* Seed the PRNG. */
+                r = read( c->entropy_fd, c->prng_seed.s, c->prng_seed.length );
+
+                /* Check the result. */
+                if( r < 0 )
+                {
+                    c->pass_type = NWIPE_PASS_NONE;
+                    nwipe_perror( errno, __FUNCTION__, "read" );
+                    nwipe_log( NWIPE_LOG_FATAL, "Unable to seed the PRNG." );
+                    return -1;
+                }
+
+                /* Check for a partial read. */
+                if( r != c->prng_seed.length )
+                {
+                    /* TODO: Handle partial reads. */
+                    nwipe_log( NWIPE_LOG_FATAL, "Insufficient entropy is available." );
+                    return -1;
+                }
+
+                /* Write the random pass. */
+                r = nwipe_random_pass( c );
+                c->pass_type = NWIPE_PASS_NONE;
+
+                /* Log number of bytes written to disk */
+                nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes written to %s", c->pass_done, c->device_name );
+
+                /* Check for a fatal error. */
+                if( r < 0 )
+                {
+                    return r;
+                }
+
+                /* Make sure IS5 enhanced always verifies its PRNG pass regardless */
+                /* of the current combination of the --noblank (which influences   */
+                /* the lastpass variable) and --verify options.                    */
+                if( nwipe_options.verify == NWIPE_VERIFY_ALL || lastpass == 1 || nwipe_options.method == &nwipe_is5enh )
+                {
+                    nwipe_log( NWIPE_LOG_NOTICE,
+                               "Verifying pass %i of %i, round %i of %i, on %s",
+                               c->pass_working,
+                               c->pass_count,
+                               c->round_working,
+                               c->round_count,
+                               c->device_name );
+
+                    /* Verify this pass. */
+                    c->pass_type = NWIPE_PASS_VERIFY;
+                    r = nwipe_random_verify( c );
+                    c->pass_type = NWIPE_PASS_NONE;
+
+                    nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes read from %s", c->pass_done, c->device_name );
+
+                    /* Check for a fatal error. */
+                    if( r < 0 )
+                    {
+                        return r;
+                    }
+
+                    nwipe_log( NWIPE_LOG_NOTICE,
+                               "Verified pass %i of %i, round %i of %i, on '%s'.",
+                               c->pass_working,
+                               c->pass_count,
+                               c->round_working,
+                               c->round_count,
+                               c->device_name );
+                }
+
+            } /* random pass */
+
+            nwipe_log( NWIPE_LOG_NOTICE,
+                       "Finished pass %i/%i, round %i/%i, on %s",
+                       c->pass_working,
+                       c->pass_count,
+                       c->round_working,
+                       c->round_count,
+                       c->device_name );
+
+        } /* for passes */
+
+        if( c->round_working < c->round_count )
+        {
+            nwipe_log(
+                NWIPE_LOG_NOTICE, "Finished round %i of %i on %s", c->round_working, c->round_count, c->device_name );
+        }
+        else
+        {
+            nwipe_log( NWIPE_LOG_NOTICE,
+                       "Finished final round %i of %i on %s",
+                       c->round_working,
+                       c->round_count,
+                       c->device_name );
+        }
+
+    } /* while rounds */
+
+    if( nwipe_options.method == &nwipe_ops2 )
+    {
+        /* NOTE: The OPS-II method specifically requires that a random pattern be left on the device. */
+
+        /* Tell the parent that we are running the final pass. */
+        c->pass_type = NWIPE_PASS_FINAL_OPS2;
+
+        /* Seed the PRNG. */
+        r = read( c->entropy_fd, c->prng_seed.s, c->prng_seed.length );
+
+        /* Check the result. */
+        if( r < 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "read" );
+            nwipe_log( NWIPE_LOG_FATAL, "Unable to seed the PRNG." );
+            return -1;
+        }
+
+        /* Check for a partial read. */
+        if( r != c->prng_seed.length )
+        {
+            /* TODO: Handle partial reads. */
+            nwipe_log( NWIPE_LOG_FATAL, "Insufficient entropy is available." );
+            return -1;
+        }
+
+        nwipe_log( NWIPE_LOG_NOTICE, "Writing final random pattern to '%s'.", c->device_name );
+
+        /* The final ops2 pass. */
+        r = nwipe_random_pass( c );
+
+        nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes written to %s", c->pass_done, c->device_name );
+
+        /* Check for a fatal error. */
+        if( r < 0 )
+        {
+            return r;
+        }
+
+        if( nwipe_options.verify == NWIPE_VERIFY_LAST || nwipe_options.verify == NWIPE_VERIFY_ALL )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "Verifying final random pattern FRP on %s", c->device_name );
+
+            /* Verify the final zero pass. */
+            r = nwipe_random_verify( c );
+
+            nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes read from %s", c->pass_done, c->device_name );
+
+            /* Check for a fatal error. */
+            if( r < 0 )
+            {
+                return r;
+            }
+
+            nwipe_log( NWIPE_LOG_NOTICE, "[SUCCESS] Verified FRP on '%s' matches", c->device_name );
+        }
+
+    } /* final ops2 */
+
+    else if( nwipe_options.method == &nwipe_verify_zero )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "Verifying that %s is zeroed", c->device_name );
+
+        /* Verify the final zero pass. */
+        c->pass_type = NWIPE_PASS_VERIFY;
+        r = nwipe_static_verify( c, &pattern_zero );
+        c->pass_type = NWIPE_PASS_NONE;
+
+        /* Check for a fatal error. */
+        if( r < 0 )
+        {
+            return r;
+        }
+        if( c->verify_errors == 0 )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "[SUCCESS] Verified that %s is Zeroed.", c->device_name );
+        }
+        else
+        {
+            nwipe_log( NWIPE_LOG_ERROR, "[FAILURE] %s has not been Zeroed .", c->device_name );
+        }
+
+    } /* verify */
+
+    else if( nwipe_options.method == &nwipe_verify_one )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "Verifying that %s is Ones (0xFF)", c->device_name );
+
+        /* Verify the final ones pass. */
+        c->pass_type = NWIPE_PASS_VERIFY;
+        r = nwipe_static_verify( c, &pattern_one );
+        c->pass_type = NWIPE_PASS_NONE;
+
+        /* Check for a fatal error. */
+        if( r < 0 )
+        {
+            return r;
+        }
+        if( c->verify_errors == 0 )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "[SUCCESS] Verified that %s is full of ones (0xFF).", c->device_name );
+        }
+        else
+        {
+            nwipe_log( NWIPE_LOG_ERROR, "[FAILURE] %s is not full of ones (0xFF).", c->device_name );
+        }
+
+    } /* verify */
+
+    else if( nwipe_options.noblank == 0 )
+    {
+        /* Tell the user that we are on the final pass. */
+        c->pass_type = NWIPE_PASS_FINAL_BLANK;
+
+        nwipe_log( NWIPE_LOG_NOTICE, "Blanking device %s", c->device_name );
+
+        /* The final zero pass. */
+        r = nwipe_static_pass( c, &pattern_zero );
+
+        /* Log number of bytes written to disk */
+        nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes written to %s", c->pass_done, c->device_name );
+
+        /* Check for a fatal error. */
+        if( r < 0 )
+        {
+            return r;
+        }
+
+        if( nwipe_options.verify == NWIPE_VERIFY_LAST || nwipe_options.verify == NWIPE_VERIFY_ALL )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "Verifying that %s is empty.", c->device_name );
+
+            /* Verify the final zero pass. */
+            c->pass_type = NWIPE_PASS_VERIFY;
+            r = nwipe_static_verify( c, &pattern_zero );
+            c->pass_type = NWIPE_PASS_NONE;
+
+            /* Log number of bytes read from disk */
+            nwipe_log( NWIPE_LOG_NOTICE, "%llu bytes read from %s", c->pass_done, c->device_name );
+
+            /* Check for a fatal error. */
+            if( r < 0 )
+            {
+                return r;
+            }
+
+            if( c->verify_errors == 0 )
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "[SUCCESS] Verified that %s is empty.", c->device_name );
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "[FAILURE] %s Verification errors, not empty", c->device_name );
+            }
+        }
+
+        if( c->verify_errors == 0 && c->pass_errors == 0 )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "[SUCCESS] Blanked device %s", c->device_name );
+        }
+        else
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "[FAILURE] %s may not be blanked", c->device_name );
+        }
+
+    } /* final blank */
+
+    /* Release the state buffer. */
+    c->prng_seed.length = 0;
+    free( c->prng_seed.s );
+
+    /* Tell the parent that we have fininshed the final pass. */
+    c->pass_type = NWIPE_PASS_NONE;
+
+    if( c->verify_errors > 0 )
+    {
+        /* We finished, but with non-fatal verification errors. */
+        nwipe_log( NWIPE_LOG_ERROR, "%llu verification errors on '%s'.", c->verify_errors, c->device_name );
+    }
+
+    if( c->pass_errors > 0 )
+    {
+        /* We finished, but with non-fatal wipe errors. */
+        nwipe_log( NWIPE_LOG_ERROR, "%llu wipe errors on '%s'.", c->pass_errors, c->device_name );
+    }
+
+    /* FIXME: The 'round_errors' context member is not being used. */
+
+    if( c->pass_errors > 0 || c->round_errors > 0 || c->verify_errors > 0 )
+    {
+        /* We finished, but with non-fatal errors. */
+        return 1;
+    }
+
+    /* We finished successfully. */
+    return 0;
+
+} /* nwipe_runmethod */
+
+void calculate_round_size( nwipe_context_t* c )
+{
+    /* This is where the round size is calculated. round_size is used in the running percentage completion
+     * calculation. round size is calculated based on pass_size, pass_count, number of rounds, blanking
+     * on/off and verification All/Last/None
+     *
+     * To hopefully make this calculation more understandable, I have separated the calculations that apply to
+     * all methods and processed first then created a switch statement that contains method specific changes if any
+     */
+
+    /* Don't change the order of these values as the case statements use their index in the array */
+    void* array_methods[] = { &nwipe_zero,
+                              &nwipe_ops2,
+                              &nwipe_dodshort,
+                              &nwipe_dod522022m,
+                              &nwipe_gutmann,
+                              &nwipe_random,
+                              &nwipe_is5enh,
+                              NULL };
+    int i;
+
+    /* This while loop allows us to effectively create a const so we can use a case statement rather than if statements.
+     * This is probably more readable as more methods may get added in the future. The code could be condensed as some
+     * methods have identical adjustments, however as there are only a few methods I felt it was easier to understand as
+     * it is, however this could be changed if necessary.
+     */
+
+    int selected_method;
+    i = 0;
+    while( array_methods[i] != NULL )
+    {
+        if( nwipe_options.method == array_methods[i] )
+        {
+            selected_method = i;
+        }
+        i++;
+    }
+
+    if( nwipe_options.verify == NWIPE_VERIFY_ALL )
+    {
+        /* We must read back all passes, so double the byte count. */
+        c->pass_size *= 2;
+    }
+
+    /* Tell the parent the number of rounds that will be run. */
+    c->round_count = nwipe_options.rounds;
+
+    /* Set the initial number of bytes that will be written across all rounds.
+       c->pass_size includes write AND verification passes if 'verify_all' is selected
+       but does not include the final blanking pass or the verify_last option */
+    c->round_size = c->pass_size;
+
+    /* Multiple the round_size by the number of rounds (times) the user wants to wipe the drive with this method. */
+    c->round_size *= c->round_count;
+
+    /* Now increase size based on whether blanking is enabled and verification */
+    if( nwipe_options.noblank == 0 )
+    {
+        /* Blanking enabled so increase round size */
+        c->round_size += c->device_size;
+
+        if( nwipe_options.verify == NWIPE_VERIFY_LAST || nwipe_options.verify == NWIPE_VERIFY_ALL )
+        {
+            c->round_size += c->device_size;
+        }
+    }
+    else
+    {
+        /* Blanking not enabled, check for 'Verify_last', increase round size if enabled. */
+        if( nwipe_options.verify == NWIPE_VERIFY_LAST )
+        {
+            c->round_size += c->device_size;
+        }
+    }
+
+    /* Additional method specific round_size adjustments go in this switch statement */
+
+    switch( selected_method )
+    {
+        case 0:
+            /* NWIPE_ZERO - No additional calculation required
+             * ---------- */
+            break;
+
+        case 1:
+            /* NWIPE_OPS2
+             * ---------- */
+
+            /* Required for mandatory 9th and final random pass */
+            c->round_size += c->device_size;
+
+            /* Required for selectable 9th and final random verification */
+            if( nwipe_options.verify == NWIPE_VERIFY_ALL || nwipe_options.verify == NWIPE_VERIFY_LAST )
+            {
+                c->round_size += c->device_size;
+            }
+
+            /* As no final zero blanking pass is permitted by this standard reduce round size if it's selected */
+            if( nwipe_options.noblank == 0 )
+            {
+                /* Reduce for blanking pass */
+                c->round_size -= c->device_size;
+
+                /* Reduce for blanking pass verification */
+                if( nwipe_options.verify == NWIPE_VERIFY_ALL || nwipe_options.verify == NWIPE_VERIFY_LAST )
+                {
+                    c->round_size -= c->device_size;
+                }
+            }
+            else
+            {
+                if( nwipe_options.verify == NWIPE_VERIFY_LAST )
+                {
+                    /* If blanking off & verification on reduce round size */
+                    c->round_size -= c->device_size;
+                }
+            }
+
+            break;
+
+        case 2:
+            /* DoD Short - No additional calculation required
+             * --------- */
+
+            break;
+
+        case 3:
+            /* DOD 522022m - No additional calculation required
+             * ----------- */
+
+            break;
+
+        case 4:
+            /* GutMann - No additional calculation required
+             * ------- */
+
+            break;
+
+        case 5:
+            /* PRNG (random) - No additional calculation required
+             * ------------- */
+
+            break;
+
+        case 6:
+            /* NWIPE_IS5ENH
+             * ------------ */
+
+            /* This method ALWAYS verifies the 3rd pass so increase by device size,
+             * but NOT if VERIFY_ALL has been selected, but first .. */
+
+            /* Reduce as Verify_Last already included previously if blanking was off */
+            if( nwipe_options.verify == NWIPE_VERIFY_LAST && nwipe_options.noblank == 1 )
+            {
+                c->round_size -= c->device_size;
+            }
+
+            /* Adjusts for verify on every third pass multiplied by number of rounds */
+            if( nwipe_options.verify != NWIPE_VERIFY_ALL )
+            {
+                c->round_size += ( c->device_size * c->round_count );
+            }
+
+            break;
+    }
+}
+
+/* eof */
diff --git a/src/method.h b/src/method.h
new file mode 100644
index 0000000..f6fdbc2
--- /dev/null
+++ b/src/method.h
@@ -0,0 +1,60 @@
+/*
+ *  methods.c: Method implementations for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef METHOD_H_
+#define METHOD_H_
+
+/* The argument list for nwipe methods. */
+#define NWIPE_METHOD_SIGNATURE nwipe_context_t* c
+
+typedef enum nwipe_verify_t_ {
+    NWIPE_VERIFY_NONE = 0,  // Do not read anything back from the device.
+    NWIPE_VERIFY_LAST,  // Check the last pass.
+    NWIPE_VERIFY_ALL,  // Check all passes.
+} nwipe_verify_t;
+
+/* The typedef of the function that will do the wipe. */
+typedef int ( *nwipe_method_t )( void* ptr );
+
+typedef struct
+{
+    int length;  // Length of the pattern in bytes, -1 means random.
+    char* s;  // The actual bytes of the pattern.
+} nwipe_pattern_t;
+
+const char* nwipe_method_label( void* method );
+int nwipe_runmethod( NWIPE_METHOD_SIGNATURE, nwipe_pattern_t* patterns );
+
+void* nwipe_dod522022m( void* ptr );
+void* nwipe_dodshort( void* ptr );
+void* nwipe_gutmann( void* ptr );
+void* nwipe_ops2( void* ptr );
+void* nwipe_is5enh( void* ptr );
+void* nwipe_random( void* ptr );
+void* nwipe_zero( void* ptr );
+void* nwipe_one( void* ptr );
+void* nwipe_verify_zero( void* ptr );
+void* nwipe_verify_one( void* ptr );
+
+void calculate_round_size( nwipe_context_t* );
+
+#endif /* METHOD_H_ */
diff --git a/src/mt19937ar-cok/mt19937ar-cok.c b/src/mt19937ar-cok/mt19937ar-cok.c
new file mode 100644
index 0000000..63ef659
--- /dev/null
+++ b/src/mt19937ar-cok/mt19937ar-cok.c
@@ -0,0 +1,139 @@
+/* 
+	This code is modified for use in nwipe.
+
+   A C-program for MT19937, with initialization improved 2002/2/10.
+   Coded by Takuji Nishimura and Makoto Matsumoto.
+   This is a faster version by taking Shawn Cokus's optimization,
+   Matthe Bellew's simplification, Isaku Wada's real version.
+
+   Before using, initialize the state by using init_genrand(seed) 
+   or init_by_array(init_key, key_length).
+
+   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
+   All rights reserved.                          
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+     1. Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+
+     2. Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+
+     3. The names of its contributors may not be used to endorse or promote 
+        products derived from this software without specific prior written 
+        permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+   Any feedback is very welcome.
+   http://www.math.keio.ac.jp/matumoto/emt.html
+   email: matumoto@math.keio.ac.jp
+*/
+
+#include <stdio.h>
+#include "mt19937ar-cok.h"
+
+/* initializes state[N] with a seed */
+void init_genrand( twister_state_t* state, unsigned long s)
+{
+	int j;
+	state->array[0]= s & 0xffffffffUL;
+	for( j = 1; j < N; j++ )
+	{
+		state->array[j] = (1812433253UL * (state->array[j-1] ^ (state->array[j-1] >> 30)) + j); 
+		state->array[j] &= 0xffffffffUL;  /* for >32 bit machines */
+	}
+	state->left = 1;
+	state->initf = 1;
+}
+
+
+void twister_init( twister_state_t* state, unsigned long init_key[], unsigned long key_length )
+{
+    int i = 1;
+	 int j = 0;
+    int k = ( N > key_length ? N : key_length );
+
+    init_genrand( state, 19650218UL );
+
+    for( ; k; k-- )
+	 {
+		state->array[i] = (state->array[i] ^ ((state->array[i-1] ^ (state->array[i-1] >> 30)) * 1664525UL)) + init_key[j] + j;
+		state->array[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
+		++i;
+		++j;
+
+		if ( i >= N )
+		{
+			state->array[0] = state->array[N-1];
+			i = 1;
+		}
+
+		if ( j >= key_length )
+		{
+			j = 0;
+		}
+    }
+
+    for( k = N -1; k; k-- )
+	 {
+		state->array[i] = (state->array[i] ^ ((state->array[i-1] ^ (state->array[i-1] >> 30)) * 1566083941UL)) - i;
+		state->array[i] &= 0xffffffffUL;
+		++i;
+
+		if ( i >= N )
+		{
+			state->array[0] = state->array[N-1];
+			i = 1;
+		}
+    }
+
+	state->array[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */ 
+	state->left = 1;
+	state->initf = 1;
+}
+
+static void next_state( twister_state_t* state )
+{
+    unsigned long *p = state->array;
+    int j;
+
+    if( state->initf == 0) { init_genrand( state, 5489UL ); }
+    state->left = N;
+    state->next = state->array;
+    for( j = N - M + 1; --j; p++ ) { *p = p[M]   ^ TWIST(p[0], p[1]); }
+    for( j = M; --j; p++ )         { *p = p[M-N] ^ TWIST(p[0], p[1]); }
+    *p = p[M-N] ^ TWIST(p[0], state->array[0]);
+}
+
+/* generates a random number on [0,0xffffffff]-interval */
+unsigned long twister_genrand_int32( twister_state_t* state )
+{
+    unsigned long y;
+
+    if ( --state->left == 0 ) { next_state( state ); }
+    y = *state->next++;
+
+    /* Tempering */
+    y ^= (y >> 11);
+    y ^= (y << 7) & 0x9d2c5680UL;
+    y ^= (y << 15) & 0xefc60000UL;
+    y ^= (y >> 18);
+
+    return y;
+}
diff --git a/src/mt19937ar-cok/mt19937ar-cok.h b/src/mt19937ar-cok/mt19937ar-cok.h
new file mode 100644
index 0000000..afcc873
--- /dev/null
+++ b/src/mt19937ar-cok/mt19937ar-cok.h
@@ -0,0 +1,32 @@
+/*
+ * mt19937ar-cok.h:  The Mersenne Twister PRNG implementation for nwipe.
+ *
+ */
+
+#ifndef MT19937AR_H_
+#define MT19937AR_H_
+
+/* Period parameters */
+#define N 624
+#define M 397
+#define MATRIX_A 0x9908b0dfUL   /* constant vector a */
+#define UMASK 0x80000000UL /* most significant w-r bits */
+#define LMASK 0x7fffffffUL /* least significant r bits */
+#define MIXBITS(u,v) ( ((u) & UMASK) | ((v) & LMASK) )
+#define TWIST(u,v) ((MIXBITS(u,v) >> 1) ^ ((v)&1UL ? MATRIX_A : 0UL))
+
+typedef struct twister_state_t_
+{
+	unsigned long array[N];
+	int left;
+	int initf;
+	unsigned long *next;
+} twister_state_t; 
+
+/* Initialize the MT state. ( 0 < key_length <= 624 ). */
+void twister_init( twister_state_t* state, unsigned long init_key[], unsigned long key_length);
+
+/* Generate a random integer on the [0,0xffffffff] interval. */
+unsigned long twister_genrand_int32( twister_state_t* state );
+
+#endif /* MT19937AR_H_ */
diff --git a/src/nwipe.c b/src/nwipe.c
new file mode 100644
index 0000000..d5f3798
--- /dev/null
+++ b/src/nwipe.c
@@ -0,0 +1,982 @@
+/*
+ *  nwipe.c:  Darik's Wipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#ifndef _POSIX_SOURCE
+#define _POSIX_SOURCE
+#endif
+
+#include <stdint.h>
+#include <time.h>
+#include <signal.h>
+#include <pthread.h>
+#include <sys/types.h>
+
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "prng.h"
+#include "options.h"
+#include "device.h"
+#include "logging.h"
+#include "gui.h"
+#include "temperature.h"
+
+#include <sys/ioctl.h> /* FIXME: Twice Included */
+#include <sys/shm.h>
+#include <wait.h>
+
+#include <parted/parted.h>
+#include <parted/debug.h>
+#include "version.h"
+
+int terminate_signal;
+int user_abort;
+int global_wipe_status;
+
+int main( int argc, char** argv )
+{
+    int nwipe_optind;  // The result of nwipe_options().
+    int nwipe_enumerated;  // The number of contexts that have been enumerated.
+    int nwipe_error = 0;  // An error counter.
+    int nwipe_selected = 0;  // The number of contexts that have been selected.
+    int any_threads_still_running;  // used in wipe thread cancellation wait loop
+    int thread_timeout_counter;  // timeout thread cancellation after THREAD_CANCELLATION_TIMEOUT seconds
+    pthread_t nwipe_gui_thread = 0;  // The thread ID of the GUI thread.
+    pthread_t nwipe_sigint_thread;  // The thread ID of the sigint handler.
+
+    char modprobe_command[] = "modprobe %s";
+    char modprobe_command2[] = "/sbin/modprobe %s";
+    char modprobe_command3[] = "/usr/sbin/modprobe %s";
+    char module_shortform[50];
+    char final_cmd_modprobe[sizeof( modprobe_command ) + sizeof( module_shortform )];
+
+    /* The entropy source file handle. */
+    int nwipe_entropy;
+
+    /* The generic index variables. */
+    int i;
+    int j;
+
+    /* The generic result buffer. */
+    int r;
+
+    /* Log nwipes version */
+    nwipe_log( NWIPE_LOG_INFO, "%s", banner );
+
+    /* Log OS info */
+    nwipe_log_OSinfo();
+
+    /* Initialise the termintaion signal, 1=terminate nwipe */
+    terminate_signal = 0;
+
+    /* Initialise the user abort signal, 1=User aborted with CNTRL-C,SIGTERM, SIGQUIT, SIGINT etc.. */
+    user_abort = 0;
+
+    /* nwipes return status value, set prior to exit at the end of nwipe, as no other exit points allowed */
+    int return_status = 0;
+
+    /* Initialise, flag indicating whether a wipe has actually started or not 0=no, 1=yes */
+    global_wipe_status = 0;
+
+    /* Initialise flags that indicate whether a fatal or non fatal error occurred on ANY drive */
+    int fatal_errors_flag = 0;
+    int non_fatal_errors_flag = 0;
+
+    /* Two arrays are used, containing pointers to the the typedef for each disk */
+    /* The first array (c1) points to all devices, the second points to only     */
+    /* the disks selected for wiping.                                            */
+
+    /* The array of pointers to enumerated contexts. */
+    /* Initialised and populated in device scan.     */
+    nwipe_context_t** c1 = 0;
+
+    int wipe_threads_started = 0;
+
+    /* Parse command line options. */
+    nwipe_optind = nwipe_options_parse( argc, argv );
+
+    if( nwipe_optind == argc )
+    {
+        /* File names were not given by the user.  Scan for devices. */
+        nwipe_enumerated = nwipe_device_scan( &c1 );
+
+        if( terminate_signal == 1 )
+        {
+            cleanup();
+            exit( 1 );
+        }
+
+        if( nwipe_enumerated == 0 )
+        {
+            nwipe_log( NWIPE_LOG_INFO,
+                       "Storage devices not found. Nwipe should be run as root or sudo/su, i.e sudo nwipe etc" );
+            cleanup();
+            return -1;
+        }
+        else
+        {
+            nwipe_log( NWIPE_LOG_INFO, "Automatically enumerated %i devices.", nwipe_enumerated );
+        }
+    }
+    else
+    {
+        argv += nwipe_optind;
+        argc -= nwipe_optind;
+
+        nwipe_enumerated = nwipe_device_get( &c1, argv, argc );
+        if( nwipe_enumerated == 0 )
+        {
+            nwipe_log( NWIPE_LOG_ERROR, "Devices not found. Check you're not excluding drives unnecessarily." );
+            printf( "No drives found\n" );
+            cleanup();
+            exit( 1 );
+        }
+    }
+
+    if( terminate_signal == 1 )
+    {
+        cleanup();
+        exit( 1 );
+    }
+
+    /* Log the System information */
+    nwipe_log_sysinfo();
+
+    /* The array of pointers to contexts that will actually be wiped. */
+    nwipe_context_t** c2 = (nwipe_context_t**) malloc( nwipe_enumerated * sizeof( nwipe_context_t* ) );
+
+    /* Open the entropy source. */
+    nwipe_entropy = open( NWIPE_KNOB_ENTROPY, O_RDONLY );
+
+    /* Check the result. */
+    if( nwipe_entropy < 0 )
+    {
+        nwipe_perror( errno, __FUNCTION__, "open" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to open entropy source %s.", NWIPE_KNOB_ENTROPY );
+        cleanup();
+        free( c2 );
+        return errno;
+    }
+
+    nwipe_log( NWIPE_LOG_NOTICE, "Opened entropy source '%s'.", NWIPE_KNOB_ENTROPY );
+
+    /* Block relevant signals in main thread. Any other threads that are     */
+    /*        created after this will also block those signals.              */
+    sigset_t sigset;
+    sigemptyset( &sigset );
+    sigaddset( &sigset, SIGHUP );
+    sigaddset( &sigset, SIGTERM );
+    sigaddset( &sigset, SIGQUIT );
+    sigaddset( &sigset, SIGINT );
+    sigaddset( &sigset, SIGUSR1 );
+    pthread_sigmask( SIG_SETMASK, &sigset, NULL );
+
+    /* Create a signal handler thread.  This thread will catch all           */
+    /*      signals and decide what to do with them.  This will only         */
+    /*      catch nondirected signals.  (I.e., if a thread causes a SIGFPE   */
+    /*      then that thread will get that signal.                           */
+
+    /* Pass a pointer to a struct containing all data to the signal handler. */
+    nwipe_misc_thread_data_t nwipe_misc_thread_data;
+    nwipe_thread_data_ptr_t nwipe_thread_data_ptr;
+
+    nwipe_thread_data_ptr.c = c2;
+    nwipe_misc_thread_data.nwipe_enumerated = nwipe_enumerated;
+    nwipe_misc_thread_data.nwipe_selected = 0;
+    if( !nwipe_options.nogui )
+        nwipe_misc_thread_data.gui_thread = &nwipe_gui_thread;
+    nwipe_thread_data_ptr.nwipe_misc_thread_data = &nwipe_misc_thread_data;
+
+    if( !nwipe_options.nosignals )
+    {
+        pthread_attr_t pthread_attr;
+        pthread_attr_init( &pthread_attr );
+        pthread_attr_setdetachstate( &pthread_attr, PTHREAD_CREATE_DETACHED );
+
+        pthread_create( &nwipe_sigint_thread, &pthread_attr, signal_hand, &nwipe_thread_data_ptr );
+    }
+
+    /* Makesure the drivetemp module is loaded, else drives hwmon entries won't appear in /sys/class/hwmon */
+    final_cmd_modprobe[0] = 0;
+
+    /* The kernel module we are going to load */
+    strcpy( module_shortform, "drivetemp" );
+
+    /* Determine whether we can access modprobe, required if the PATH environment is not setup ! (Debian sid 'su' as
+     * opposed to 'su -' */
+
+    if( system( "which modprobe > /dev/null 2>&1" ) )
+    {
+        if( system( "which /sbin/modprobe > /dev/null 2>&1" ) )
+        {
+            if( system( "which /usr/sbin/modprobe > /dev/null 2>&1" ) )
+            {
+                nwipe_log( NWIPE_LOG_WARNING, "modprobe command not found. Install kmod package (modprobe)) !" );
+                nwipe_log( NWIPE_LOG_WARNING, "Most temperature monitoring may be unavailable as module drivetemp" );
+                nwipe_log( NWIPE_LOG_WARNING, "could not be loaded. drivetemp is not available on kernels < v5.5" );
+            }
+            else
+            {
+                sprintf( final_cmd_modprobe, modprobe_command3, module_shortform );
+            }
+        }
+        else
+        {
+            sprintf( final_cmd_modprobe, modprobe_command2, module_shortform );
+        }
+    }
+    else
+    {
+        sprintf( final_cmd_modprobe, modprobe_command, module_shortform );
+    }
+
+    /* load the drivetemp module */
+    if( system( final_cmd_modprobe ) != 0 )
+    {
+        nwipe_log( NWIPE_LOG_WARNING, "hwmon: Unable to load module drivetemp, temperatures may be unavilable." );
+        nwipe_log( NWIPE_LOG_WARNING, "hwmon: It's possible the drivetemp software isn't modular but built-in" );
+        nwipe_log( NWIPE_LOG_WARNING, "hwmon: to the kernel, as is the case with ShredOS.x86_64 in which case" );
+        nwipe_log( NWIPE_LOG_WARNING, "hwmon: the temperatures will actually be available despite this issue." );
+    }
+    else
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "hwmon: Module drivetemp loaded, drive temperatures available" );
+    }
+
+    /* A context struct for each device has already been created. */
+    /* Now set specific nwipe options */
+    for( i = 0; i < nwipe_enumerated; i++ )
+    {
+
+        /* Set the entropy source. */
+        c1[i]->entropy_fd = nwipe_entropy;
+
+        if( nwipe_options.autonuke )
+        {
+            /* When the autonuke option is set, select all disks. */
+            // TODO - partitions
+            // if( c1[i].device_part == 0 ) { c1[i].select = NWIPE_SELECT_TRUE;        }
+            // else                         { c1[i].select = NWIPE_SELECT_TRUE_PARENT; }
+            c1[i]->select = NWIPE_SELECT_TRUE;
+        }
+        else
+        {
+            /* The user must manually select devices. */
+            c1[i]->select = NWIPE_SELECT_FALSE;
+        }
+
+        /* Initialise temperature variables for device */
+        nwipe_init_temperature( c1[i] );
+        if( nwipe_options.verbose )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "hwmon: Device %s hwmon path = %s", c1[i]->device_name, c1[i]->temp1_path );
+        }
+
+        nwipe_update_temperature( c1[i] );
+    }
+
+    /* Check for initialization errors. */
+    if( nwipe_error )
+    {
+        nwipe_log( NWIPE_LOG_ERROR, "Initialization error %i\n", nwipe_error );
+        cleanup();
+        return -1;
+    }
+
+    /* Start the ncurses interface. */
+    if( !nwipe_options.nogui )
+        nwipe_gui_init();
+
+    if( nwipe_options.autonuke == 1 )
+    {
+        /* Print the options window. */
+        if( !nwipe_options.nogui )
+            nwipe_gui_options();
+    }
+    else
+    {
+        /* Get device selections from the user. */
+        if( nwipe_options.nogui )
+        {
+            printf( "--nogui option must be used with autonuke option\n" );
+            cleanup();
+            exit( 1 );
+        }
+        else
+        {
+            nwipe_gui_select( nwipe_enumerated, c1 );
+        }
+    }
+
+    for( i = 0; i < nwipe_enumerated; i++ )
+    {
+        /* Set the PRNG implementation, which must always come after the function nwipe_gui_select ! */
+        c1[i]->prng = nwipe_options.prng;
+        c1[i]->prng_seed.length = 0;
+        c1[i]->prng_seed.s = 0;
+        c1[i]->prng_state = 0;
+
+        /* Count the number of selected contexts. */
+        if( c1[i]->select == NWIPE_SELECT_TRUE )
+        {
+            nwipe_selected += 1;
+        }
+
+        /* Initialise the wipe result value */
+        c1[i]->result = 0;
+    }
+
+    /* Pass the number selected to the struct for other threads */
+    nwipe_misc_thread_data.nwipe_selected = nwipe_selected;
+
+    /* Populate the array of selected contexts. */
+    for( i = 0, j = 0; i < nwipe_enumerated; i++ )
+    {
+        if( c1[i]->select == NWIPE_SELECT_TRUE )
+        {
+            /* Copy the context. */
+            c2[j++] = c1[i];
+        }
+    }
+
+    /* TODO: free c1 and c2 memory. */
+    if( user_abort == 0 )
+    {
+        /* Log the wipe options that have been selected immediately prior to the start of the wipe */
+        nwipe_options_log();
+
+        /* The wipe has been initiated */
+        global_wipe_status = 1;
+
+        for( i = 0; i < nwipe_selected; i++ )
+        {
+            /* A result buffer for the BLKGETSIZE64 ioctl. */
+            u64 size64;
+
+            /* Initialise the spinner character index */
+            c2[i]->spinner_idx = 0;
+
+            /* Initialise the start and end time of the wipe */
+            c2[i]->start_time = 0;
+            c2[i]->end_time = 0;
+
+            /* Initialise the wipe_status flag, -1 = wipe not yet started */
+            c2[i]->wipe_status = -1;
+
+            /* Open the file for reads and writes. */
+            c2[i]->device_fd = open( c2[i]->device_name, O_RDWR );
+
+            /* Check the open() result. */
+            if( c2[i]->device_fd < 0 )
+            {
+                nwipe_perror( errno, __FUNCTION__, "open" );
+                nwipe_log( NWIPE_LOG_WARNING, "Unable to open device '%s'.", c2[i]->device_name );
+                c2[i]->select = NWIPE_SELECT_DISABLED;
+                continue;
+            }
+
+            /* Stat the file. */
+            if( fstat( c2[i]->device_fd, &c2[i]->device_stat ) != 0 )
+            {
+                nwipe_perror( errno, __FUNCTION__, "fstat" );
+                nwipe_log( NWIPE_LOG_ERROR, "Unable to stat file '%s'.", c2[i]->device_name );
+                nwipe_error++;
+                continue;
+            }
+
+            /* Check that the file is a block device. */
+            if( !S_ISBLK( c2[i]->device_stat.st_mode ) )
+            {
+                nwipe_log( NWIPE_LOG_ERROR, "'%s' is not a block device.", c2[i]->device_name );
+                nwipe_error++;
+                continue;
+            }
+
+            /* TODO: Lock the file for exclusive access. */
+            /*
+            if( flock( c2[i]->device_fd, LOCK_EX | LOCK_NB ) != 0 )
+            {
+                    nwipe_perror( errno, __FUNCTION__, "flock" );
+                    nwipe_log( NWIPE_LOG_ERROR, "Unable to lock the '%s' file.", c2[i]->device_name );
+                    nwipe_error++;
+                    continue;
+            }
+            */
+
+            /* Print serial number of device if it exists. */
+            if( strlen( (const char*) c2[i]->device_serial_no ) )
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "%s has serial number %s", c2[i]->device_name, c2[i]->device_serial_no );
+            }
+
+            /* Do sector size and block size checking. */
+            if( ioctl( c2[i]->device_fd, BLKSSZGET, &c2[i]->device_sector_size ) == 0 )
+            {
+
+                if( ioctl( c2[i]->device_fd, BLKBSZGET, &c2[i]->device_block_size ) != 0 )
+                {
+                    nwipe_log( NWIPE_LOG_WARNING, "Device '%s' failed BLKBSZGET ioctl.", c2[i]->device_name );
+                    c2[i]->device_block_size = 0;
+                }
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_WARNING, "Device '%s' failed BLKSSZGET ioctl.", c2[i]->device_name );
+                c2[i]->device_sector_size = 0;
+                c2[i]->device_block_size = 0;
+            }
+
+            /* The st_size field is zero for block devices. */
+            /* ioctl( c2[i]->device_fd, BLKGETSIZE64, &c2[i]->device_size ); */
+
+            /* Seek to the end of the device to determine its size. */
+            c2[i]->device_size = lseek( c2[i]->device_fd, 0, SEEK_END );
+
+            /* Also ask the driver for the device size. */
+            /* if( ioctl( c2[i]->device_fd, BLKGETSIZE64, &size64 ) ) */
+            if( ioctl( c2[i]->device_fd, _IOR( 0x12, 114, size_t ), &size64 ) )
+            {
+                /* The ioctl failed. */
+                fprintf( stderr, "Error: BLKGETSIZE64 failed  on '%s'.\n", c2[i]->device_name );
+                nwipe_log( NWIPE_LOG_ERROR, "BLKGETSIZE64 failed  on '%s'.\n", c2[i]->device_name );
+                nwipe_error++;
+            }
+            c2[i]->device_size = size64;
+
+            /* Check whether the two size values agree. */
+            if( c2[i]->device_size != size64 )
+            {
+                /* This could be caused by the linux last-odd-block problem. */
+                fprintf( stderr, "Error: Last-odd-block detected on '%s'.\n", c2[i]->device_name );
+                nwipe_log( NWIPE_LOG_ERROR, "Last-odd-block detected on '%s'.", c2[i]->device_name );
+                nwipe_error++;
+            }
+
+            if( c2[i]->device_size == (long long) -1 )
+            {
+                /* We cannot determine the size of this device. */
+                nwipe_perror( errno, __FUNCTION__, "lseek" );
+                nwipe_log( NWIPE_LOG_ERROR, "Unable to determine the size of '%s'.", c2[i]->device_name );
+                nwipe_error++;
+            }
+            else
+            {
+                /* Reset the file pointer. */
+                r = lseek( c2[i]->device_fd, 0, SEEK_SET );
+
+                if( r == (off64_t) -1 )
+                {
+                    nwipe_perror( errno, __FUNCTION__, "lseek" );
+                    nwipe_log( NWIPE_LOG_ERROR, "Unable to reset the '%s' file offset.", c2[i]->device_name );
+                    nwipe_error++;
+                }
+            }
+
+            if( c2[i]->device_size == 0 )
+            {
+                nwipe_log( NWIPE_LOG_ERROR,
+                           "%s, sect/blk/dev %i/%i/%llu",
+                           c2[i]->device_name,
+                           c2[i]->device_sector_size,
+                           c2[i]->device_block_size,
+                           c2[i]->device_size );
+                nwipe_error++;
+                continue;
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_NOTICE,
+                           "%s, sect/blk/dev %i/%i/%llu",
+                           c2[i]->device_name,
+                           c2[i]->device_sector_size,
+                           c2[i]->device_block_size,
+                           c2[i]->device_size );
+            }
+
+            /* Fork a child process. */
+            errno = pthread_create( &c2[i]->thread, NULL, nwipe_options.method, (void*) c2[i] );
+            if( errno )
+            {
+                nwipe_perror( errno, __FUNCTION__, "pthread_create" );
+                if( !nwipe_options.nogui )
+                    nwipe_gui_free();
+                return errno;
+            }
+            else
+            {
+                wipe_threads_started = 1;
+            }
+        }
+    }
+
+    /* Change the terminal mode to non-blocking input. */
+    nodelay( stdscr, 0 );
+
+    /* Set getch to delay in order to slow screen updates. */
+    halfdelay( NWIPE_KNOB_SLEEP * 10 );
+
+    /* Set up data structs to pass the GUI thread the data it needs. */
+    nwipe_thread_data_ptr_t nwipe_gui_data;
+    if( !nwipe_options.nogui )
+    {
+        nwipe_gui_data.c = c2;
+        nwipe_gui_data.nwipe_misc_thread_data = &nwipe_misc_thread_data;
+        /* Fork the GUI thread. */
+        errno = pthread_create( &nwipe_gui_thread, NULL, nwipe_gui_status, &nwipe_gui_data );
+    }
+
+    /* Wait for all the wiping threads to finish, but don't wait if we receive the terminate signal */
+
+    /* set getch delay to 2/10th second. */
+    halfdelay( 10 );
+
+    i = 0;
+    while( i < nwipe_selected && terminate_signal == 0 )
+    {
+        if( i == nwipe_selected )
+        {
+            break;
+        }
+
+        if( c2[i]->wipe_status != 0 )
+        {
+            i = 0;
+        }
+        else
+        {
+            i++;
+            continue;
+        }
+        sleep( 1 ); /* DO NOT REMOVE ! Stops the routine hogging CPU cycles */
+    }
+
+    if( terminate_signal != 1 )
+    {
+        if( !nwipe_options.nowait && !nwipe_options.autopoweroff )
+        {
+            do
+            {
+                sleep( 1 );
+
+            } while( terminate_signal != 1 );
+        }
+    }
+    if( nwipe_options.verbose )
+    {
+        nwipe_log( NWIPE_LOG_INFO, "Exit in progress" );
+    }
+    /* Send a REQUEST for the wipe threads to be cancelled */
+    for( i = 0; i < nwipe_selected; i++ )
+    {
+
+        if( c2[i]->thread )
+        {
+            if( nwipe_options.verbose )
+            {
+                nwipe_log( NWIPE_LOG_INFO, "Requesting wipe thread cancellation for %s", c2[i]->device_name );
+            }
+            pthread_cancel( c2[i]->thread );
+        }
+    }
+
+    /* Kill the GUI thread */
+    if( nwipe_gui_thread )
+    {
+        if( nwipe_options.verbose )
+        {
+            nwipe_log( NWIPE_LOG_INFO, "Cancelling the GUI thread." );
+        }
+
+        /* We don't want to use pthread_cancel as our GUI thread is aware of the control-c
+         *  signal and will exit itself we just join the GUI thread and wait for confirmation
+         */
+        r = pthread_join( nwipe_gui_thread, NULL );
+        if( r != 0 )
+        {
+            nwipe_log( NWIPE_LOG_WARNING, "main()>pthread_join():Error when waiting for GUI thread to cancel." );
+        }
+        else
+        {
+            if( nwipe_options.verbose )
+            {
+                nwipe_log( NWIPE_LOG_INFO, "GUI compute_stats thread has been cancelled" );
+            }
+        }
+    }
+
+    /* Release the gui. */
+    if( !nwipe_options.nogui )
+    {
+        nwipe_gui_free();
+    }
+
+    /* Now join the wipe threads and wait until they have terminated */
+    any_threads_still_running = 1;
+    thread_timeout_counter = THREAD_CANCELLATION_TIMEOUT;
+    while( any_threads_still_running )
+    {
+        /* quit waiting if we've tried 'thread_timeout_counter' times */
+        if( thread_timeout_counter == 0 )
+        {
+            break;
+        }
+
+        any_threads_still_running = 0;
+        for( i = 0; i < nwipe_selected; i++ )
+        {
+            if( c2[i]->thread )
+            {
+                printf( "\nWaiting for wipe thread to cancel for %s\n", c2[i]->device_name );
+
+                /* Joins the thread and waits for completion before continuing */
+                r = pthread_join( c2[i]->thread, NULL );
+                if( r != 0 )
+                {
+                    nwipe_log( NWIPE_LOG_ERROR,
+                               "Error joining the wipe thread when waiting for thread to cancel.",
+                               c2[i]->device_name );
+
+                    if( r == EDEADLK )
+                    {
+                        nwipe_log( NWIPE_LOG_ERROR,
+                                   "Error joining the wipe thread: EDEADLK: Deadlock detected.",
+                                   c2[i]->device_name );
+                    }
+                    else
+                    {
+                        if( r == EINVAL )
+                        {
+                            nwipe_log( NWIPE_LOG_ERROR,
+                                       "Error joining the wipe thread: %s EINVAL: thread is not joinable.",
+                                       c2[i]->device_name );
+                        }
+                        else
+                        {
+                            if( r == ESRCH )
+                            {
+                                nwipe_log( NWIPE_LOG_ERROR,
+                                           "Error joining the wipe thread: %s ESRCH: no matching thread found",
+                                           c2[i]->device_name );
+                            }
+                        }
+                    }
+
+                    any_threads_still_running = 1;
+                }
+                else
+                {
+                    c2[i]->thread = 0; /* Zero the thread so we know it's been cancelled */
+
+                    if( nwipe_options.verbose )
+                    {
+                        nwipe_log( NWIPE_LOG_INFO, "Wipe thread for device %s has terminated", c2[i]->device_name );
+                    }
+
+                    /* Close the device file descriptor. */
+                    close( c2[i]->device_fd );
+                }
+            }
+        }
+        thread_timeout_counter--;
+        sleep( 1 );
+    }
+    if( nwipe_options.verbose )
+    {
+        for( i = 0; i < nwipe_selected; i++ )
+        {
+            nwipe_log( NWIPE_LOG_DEBUG,
+                       "Status: %s, result=%d, pass_errors=%llu, verify_errors=%llu, fsync_errors=%llu",
+                       c2[i]->device_name,
+                       c2[i]->result,
+                       c2[i]->pass_errors,
+                       c2[i]->verify_errors,
+                       c2[i]->fsyncdata_errors );
+        }
+    }
+
+    /* if no wipe threads started then zero each selected drive result flag,
+     * as we don't need to report fatal/non fatal errors if no wipes were ever started ! */
+    if( wipe_threads_started == 0 )
+    {
+        for( i = 0; i < nwipe_selected; i++ )
+        {
+            c2[i]->result = 0;
+        }
+    }
+    else
+    {
+        for( i = 0; i < nwipe_selected; i++ )
+        {
+            /* Check for errors. */
+            if( c2[i]->result != 0 || c2[i]->pass_errors != 0 || c2[i]->verify_errors != 0
+                || c2[i]->fsyncdata_errors != 0 )
+            {
+                /* If the run_method ever returns anything other than zero then makesure there is at least one pass
+                 * error This is so that the log summary tables correctly show a failure when one occurs as it only
+                 * shows pass, verification and fdatasync errors. */
+                if( c2[i]->result != 0 )
+                {
+                    if( c2[i]->pass_errors == 0 )
+                    {
+                        c2[i]->pass_errors = 1;
+                    }
+                }
+
+                nwipe_log( NWIPE_LOG_FATAL,
+                           "Nwipe exited with errors on device = %s, see log for specific error\n",
+                           c2[i]->device_name );
+                nwipe_log( NWIPE_LOG_DEBUG,
+                           "Status: %s, result=%d, pass_errors=%llu, verify_errors=%llu, fsync_errors=%llu",
+                           c2[i]->device_name,
+                           c2[i]->result,
+                           c2[i]->pass_errors,
+                           c2[i]->verify_errors,
+                           c2[i]->fsyncdata_errors );
+                non_fatal_errors_flag = 1;
+                return_status = 1;
+            }
+        }
+    }
+
+    /* Generate and send the drive status summary to the log */
+    nwipe_log_summary( c2, nwipe_selected );
+
+    /* Print a one line status message for the user */
+    if( return_status == 0 || return_status == 1 )
+    {
+        if( user_abort == 1 )
+        {
+            if( global_wipe_status == 1 )
+            {
+                nwipe_log( NWIPE_LOG_INFO,
+                           "Nwipe was aborted by the user. Check the summary table for the drive status." );
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_INFO, "Nwipe was aborted by the user prior to the wipe starting." );
+            }
+        }
+        else
+        {
+            if( fatal_errors_flag == 1 || non_fatal_errors_flag == 1 )
+            {
+                nwipe_log( NWIPE_LOG_INFO,
+                           "Nwipe exited with errors, check the log & summary table for individual drive status." );
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_INFO, "Nwipe successfully completed. See summary table for details." );
+            }
+        }
+    }
+
+    cleanup();
+
+    check_for_autopoweroff();
+
+    /* Exit. */
+    return return_status;
+}
+
+void* signal_hand( void* ptr )
+{
+    int sig;
+    int hours;
+    int minutes;
+    int seconds;
+
+    hours = 0;
+    minutes = 0;
+    seconds = 0;
+
+    // Define signals that this handler should react to
+    sigset_t sigset;
+    sigemptyset( &sigset );
+    sigaddset( &sigset, SIGHUP );
+    sigaddset( &sigset, SIGTERM );
+    sigaddset( &sigset, SIGQUIT );
+    sigaddset( &sigset, SIGINT );
+    sigaddset( &sigset, SIGUSR1 );
+
+    int i;
+    char eta[9];
+
+    /* Set up the structs we will use for the data required. */
+    nwipe_thread_data_ptr_t* nwipe_thread_data_ptr;
+    nwipe_context_t** c;
+    nwipe_misc_thread_data_t* nwipe_misc_thread_data;
+
+    /* Retrieve from the pointer passed to the function. */
+    nwipe_thread_data_ptr = (nwipe_thread_data_ptr_t*) ptr;
+    c = nwipe_thread_data_ptr->c;
+    nwipe_misc_thread_data = nwipe_thread_data_ptr->nwipe_misc_thread_data;
+
+    while( 1 )
+    {
+        /* wait for a signal to arrive */
+        sigwait( &sigset, &sig );
+
+        switch( sig )
+        {
+
+            // Log current status. All values are automatically updated by the GUI
+            case SIGUSR1:
+                compute_stats( ptr );
+
+                for( i = 0; i < nwipe_misc_thread_data->nwipe_selected; i++ )
+                {
+
+                    if( c[i]->thread )
+                    {
+                        char* status = "";
+                        switch( c[i]->pass_type )
+                        {
+                            case NWIPE_PASS_FINAL_BLANK:
+                                status = "[blanking]";
+                                break;
+
+                            case NWIPE_PASS_FINAL_OPS2:
+                                status = "[OPS-II final]";
+                                break;
+
+                            case NWIPE_PASS_WRITE:
+                                status = "[writing]";
+                                break;
+
+                            case NWIPE_PASS_VERIFY:
+                                status = "[verifying]";
+                                break;
+
+                            case NWIPE_PASS_NONE:
+                                break;
+                        }
+                        if( c[i]->sync_status )
+                        {
+                            status = "[syncing]";
+                        }
+
+                        convert_seconds_to_hours_minutes_seconds( c[i]->eta, &hours, &minutes, &seconds );
+
+                        nwipe_log( NWIPE_LOG_INFO,
+                                   "%s: %05.2f%%, round %i of %i, pass %i of %i, eta %02i:%02i:%02i, %s",
+                                   c[i]->device_name,
+                                   c[i]->round_percent,
+                                   c[i]->round_working,
+                                   c[i]->round_count,
+                                   c[i]->pass_working,
+                                   c[i]->pass_count,
+                                   hours,
+                                   minutes,
+                                   seconds,
+                                   status );
+                    }
+                    else
+                    {
+                        if( c[i]->result == 0 )
+                        {
+                            nwipe_log( NWIPE_LOG_INFO, "%s: Success", c[i]->device_name );
+                        }
+                        else if( c[i]->signal )
+                        {
+                            nwipe_log(
+                                NWIPE_LOG_INFO, "%s: >>> FAILURE! <<<: signal %i", c[i]->device_name, c[i]->signal );
+                        }
+                        else
+                        {
+                            nwipe_log(
+                                NWIPE_LOG_INFO, "%s: >>> FAILURE! <<<: code %i", c[i]->device_name, c[i]->result );
+                        }
+                    }
+                }
+
+                break;
+
+            case SIGHUP:
+            case SIGINT:
+            case SIGQUIT:
+            case SIGTERM:
+                /* Set termination flag for main() which will do housekeeping prior to exit */
+                terminate_signal = 1;
+
+                /* Set the user abort flag */
+                user_abort = 1;
+
+                /* Return control to the main thread, returning the signal received */
+                return ( (void*) 0 );
+
+                break;
+        }
+    }
+
+    return ( 0 );
+}
+
+int cleanup()
+{
+    int i;
+    extern int log_elements_displayed;
+    extern int log_elements_allocated;
+    extern char** log_lines;
+
+    /* Print the logs held in memory. */
+    for( i = log_elements_displayed; i < log_elements_allocated; i++ )
+    {
+        printf( "%s\n", log_lines[i] );
+    }
+    fflush( stdout );
+
+    /* Deallocate memory used by logging */
+    if( log_elements_allocated != 0 )
+    {
+        for( i = 0; i < log_elements_allocated; i++ )
+        {
+            free( log_lines[i] );
+        }
+        log_elements_allocated = 0;  // zeroed just in case cleanup is called twice.
+        free( log_lines );
+    }
+
+    /* TODO: All other cleanup required */
+
+    return 0;
+}
+void check_for_autopoweroff( void )
+{
+    char cmd[] = "shutdown -Ph +1 \"System going down in one minute\"";
+    FILE* fp;
+    int r;  // A result buffer.
+
+    /* User request auto power down ? */
+    if( nwipe_options.autopoweroff == 1 )
+    {
+        fp = popen( cmd, "r" );
+        if( fp == NULL )
+        {
+            nwipe_log( NWIPE_LOG_INFO, "Failed to autopoweroff to %s", cmd );
+            return;
+        }
+        r = pclose( fp );
+    }
+}
diff --git a/src/nwipe.h b/src/nwipe.h
new file mode 100644
index 0000000..73f6f99
--- /dev/null
+++ b/src/nwipe.h
@@ -0,0 +1,114 @@
+/*.
+ *  nwipe.h: The header file of the nwipe program.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef NWIPE_H_
+#define NWIPE_H_
+
+/* Function prototypes */
+int cleanup();
+void check_for_autopoweroff( void );
+void* signal_hand( void* );
+
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE
+#endif
+
+#ifndef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 64
+#endif
+
+/* workaround for Fedora */
+#ifndef off64_t
+#ifndef off_t
+#define off64_t int64_t
+#else
+#define off64_t off_t
+#endif
+#endif
+
+/* Busybox headers. */
+#ifdef BB_VER
+#include "busybox.h"
+#endif
+
+/* System headers. */
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <math.h>
+#include <pthread.h>
+#include <regex.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+/*#include "config.h"*/
+
+/* System errors. */
+extern int errno;
+
+/* 0=wipe not yet started, 1=wipe has been started by the user */
+extern int global_wipe_status;
+
+/* Ncurses headers. */
+#ifdef NCURSES_IN_SUBDIR
+#include <ncurses/ncurses.h>
+#else
+#include <ncurses.h>
+#endif
+#ifdef PANEL_IN_SUBDIR
+#include <ncurses/panel.h>
+#else
+#include <panel.h>
+#endif
+
+/* Kernel device headers. */
+#include <linux/hdreg.h>
+
+/* These types are usually defined in <asm/types.h> for __KERNEL__ code. */
+typedef unsigned long long u64;
+typedef unsigned long u32;
+typedef unsigned short u16;
+typedef unsigned char u8;
+
+/* This is required for ioctl BLKGETSIZE64, but it conflicts with <wait.h>. */
+/* #include <linux/fs.h> */
+
+/* Define ioctls that cannot be included. */
+#define BLKSSZGET _IO( 0x12, 104 )
+#define BLKBSZGET _IOR( 0x12, 112, size_t )
+#define BLKBSZSET _IOW( 0x12, 113, size_t )
+#define BLKGETSIZE64 _IOR( 0x12, 114, sizeof( u64 ) )
+
+#define THREAD_CANCELLATION_TIMEOUT 10
+
+/* This is required for ioctl FDFLUSH. */
+#include <linux/fd.h>
+
+#endif /* NWIPE_H_ */
diff --git a/src/options.c b/src/options.c
new file mode 100644
index 0000000..2930f3b
--- /dev/null
+++ b/src/options.c
@@ -0,0 +1,596 @@
+/*
+ *  options.c:  Command line processing routines for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "prng.h"
+#include "options.h"
+#include "logging.h"
+#include "version.h"
+
+/* The global options struct. */
+nwipe_options_t nwipe_options;
+
+int nwipe_options_parse( int argc, char** argv )
+{
+    extern char* optarg;  // The working getopt option argument.
+    extern int optind;  // The working getopt index into argv.
+    extern int optopt;  // The last unhandled getopt option.
+    extern int opterr;  // The last getopt error number.
+
+    extern nwipe_prng_t nwipe_twister;
+    extern nwipe_prng_t nwipe_isaac;
+    extern nwipe_prng_t nwipe_isaac64;
+
+    /* The getopt() result holder. */
+    int nwipe_opt;
+
+    /* Excluded drive indexes */
+    int idx_drive_chr;
+    int idx_optarg;
+    int idx_drive;
+
+    /* Array index variable. */
+    int i;
+
+    /* The list of acceptable short options. */
+    char nwipe_options_short[] = "Vvhl:m:p:qr:e:";
+
+    /* The list of acceptable long options. */
+    static struct option nwipe_options_long[] = {
+        /* Set when the user wants to wipe without a confirmation prompt. */
+        { "autonuke", no_argument, 0, 0 },
+
+        /* Set when the user wants to have the system powerdown on completion of wipe. */
+        { "autopoweroff", no_argument, 0, 0 },
+
+        /* A GNU standard option. Corresponds to the 'h' short option. */
+        { "help", no_argument, 0, 'h' },
+
+        /* The wipe method. Corresponds to the 'm' short option. */
+        { "method", required_argument, 0, 'm' },
+
+        /* Log file. Corresponds to the 'l' short option. */
+        { "logfile", required_argument, 0, 'l' },
+
+        /* Exclude devices, comma separated list */
+        { "exclude", required_argument, 0, 'e' },
+
+        /* The Pseudo Random Number Generator. */
+        { "prng", required_argument, 0, 'p' },
+
+        /* The number of times to run the method. */
+        { "rounds", required_argument, 0, 'r' },
+
+        /* Whether to blank the disk after wiping. */
+        { "noblank", no_argument, 0, 0 },
+
+        /* Whether to ignore all USB devices. */
+        { "nousb", no_argument, 0, 0 },
+
+        /* Whether to exit after wiping or wait for a keypress. */
+        { "nowait", no_argument, 0, 0 },
+
+        /* Whether to allow signals to interrupt a wipe. */
+        { "nosignals", no_argument, 0, 0 },
+
+        /* Whether to display the gui. */
+        { "nogui", no_argument, 0, 0 },
+
+        /* Whether to anonymize the serial numbers. */
+        { "quiet", no_argument, 0, 'q' },
+
+        /* A flag to indicate whether the devices would be opened in sync mode. */
+        { "sync", required_argument, 0, 0 },
+
+        /* Verify that wipe patterns are being written to the device. */
+        { "verify", required_argument, 0, 0 },
+
+        /* Display program version. */
+        { "verbose", no_argument, 0, 'v' },
+
+        /* Display program version. */
+        { "version", no_argument, 0, 'V' },
+
+        /* Requisite padding for getopt(). */
+        { 0, 0, 0, 0 } };
+
+    /* Set default options. */
+    nwipe_options.autonuke = 0;
+    nwipe_options.autopoweroff = 0;
+    nwipe_options.method = &nwipe_dodshort;
+    nwipe_options.prng = ( sizeof( unsigned long int ) >= 8 ) ? &nwipe_isaac64 : &nwipe_isaac;
+    nwipe_options.rounds = 1;
+    nwipe_options.noblank = 0;
+    nwipe_options.nousb = 0;
+    nwipe_options.nowait = 0;
+    nwipe_options.nosignals = 0;
+    nwipe_options.nogui = 0;
+    nwipe_options.quiet = 0;
+    nwipe_options.sync = DEFAULT_SYNC_RATE;
+    nwipe_options.verbose = 0;
+    nwipe_options.verify = NWIPE_VERIFY_LAST;
+    memset( nwipe_options.logfile, '\0', sizeof( nwipe_options.logfile ) );
+
+    /* Initialise each of the strings in the excluded drives array */
+    for( i = 0; i < MAX_NUMBER_EXCLUDED_DRIVES; i++ )
+    {
+        nwipe_options.exclude[i][0] = 0;
+    }
+
+    /* Parse command line options. */
+    while( 1 )
+    {
+        /* Get the next command line option with (3)getopt. */
+        nwipe_opt = getopt_long( argc, argv, nwipe_options_short, nwipe_options_long, &i );
+
+        /* Break when we have processed all of the given options. */
+        if( nwipe_opt < 0 )
+        {
+            break;
+        }
+
+        switch( nwipe_opt )
+        {
+            case 0: /* Long options without short counterparts. */
+
+                if( strcmp( nwipe_options_long[i].name, "autonuke" ) == 0 )
+                {
+                    nwipe_options.autonuke = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "autopoweroff" ) == 0 )
+                {
+                    nwipe_options.autopoweroff = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "noblank" ) == 0 )
+                {
+                    nwipe_options.noblank = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "nousb" ) == 0 )
+                {
+                    nwipe_options.nousb = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "nowait" ) == 0 )
+                {
+                    nwipe_options.nowait = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "nosignals" ) == 0 )
+                {
+                    nwipe_options.nosignals = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "nogui" ) == 0 )
+                {
+                    nwipe_options.nogui = 1;
+                    nwipe_options.nowait = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "verbose" ) == 0 )
+                {
+                    nwipe_options.verbose = 1;
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "sync" ) == 0 )
+                {
+                    if( sscanf( optarg, " %i", &nwipe_options.sync ) != 1 || nwipe_options.sync < 0 )
+                    {
+                        fprintf( stderr, "Error: The sync argument must be a positive integer or zero.\n" );
+                        exit( EINVAL );
+                    }
+                    break;
+                }
+
+                if( strcmp( nwipe_options_long[i].name, "verify" ) == 0 )
+                {
+
+                    if( strcmp( optarg, "0" ) == 0 || strcmp( optarg, "off" ) == 0 )
+                    {
+                        nwipe_options.verify = NWIPE_VERIFY_NONE;
+                        break;
+                    }
+
+                    if( strcmp( optarg, "1" ) == 0 || strcmp( optarg, "last" ) == 0 )
+                    {
+                        nwipe_options.verify = NWIPE_VERIFY_LAST;
+                        break;
+                    }
+
+                    if( strcmp( optarg, "2" ) == 0 || strcmp( optarg, "all" ) == 0 )
+                    {
+                        nwipe_options.verify = NWIPE_VERIFY_ALL;
+                        break;
+                    }
+
+                    /* Else we do not know this verification level. */
+                    fprintf( stderr, "Error: Unknown verification level '%s'.\n", optarg );
+                    exit( EINVAL );
+                }
+
+                /* getopt_long should raise on invalid option, so we should never get here. */
+                exit( EINVAL );
+
+            case 'm': /* Method option. */
+
+                if( strcmp( optarg, "dod522022m" ) == 0 || strcmp( optarg, "dod" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_dod522022m;
+                    break;
+                }
+
+                if( strcmp( optarg, "dodshort" ) == 0 || strcmp( optarg, "dod3pass" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_dodshort;
+                    break;
+                }
+
+                if( strcmp( optarg, "gutmann" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_gutmann;
+                    break;
+                }
+
+                if( strcmp( optarg, "ops2" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_ops2;
+                    break;
+                }
+
+                if( strcmp( optarg, "random" ) == 0 || strcmp( optarg, "prng" ) == 0
+                    || strcmp( optarg, "stream" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_random;
+                    break;
+                }
+
+                if( strcmp( optarg, "zero" ) == 0 || strcmp( optarg, "quick" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_zero;
+                    break;
+                }
+
+                if( strcmp( optarg, "one" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_one;
+                    break;
+                }
+
+                if( strcmp( optarg, "verify_zero" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_verify_zero;
+                    break;
+                }
+
+                if( strcmp( optarg, "verify_one" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_verify_one;
+                    break;
+                }
+
+                if( strcmp( optarg, "is5enh" ) == 0 )
+                {
+                    nwipe_options.method = &nwipe_is5enh;
+                    break;
+                }
+
+                /* Else we do not know this wipe method. */
+                fprintf( stderr, "Error: Unknown wipe method '%s'.\n", optarg );
+                exit( EINVAL );
+
+            case 'l': /* Log file option. */
+
+                nwipe_options.logfile[strlen( optarg )] = '\0';
+                strncpy( nwipe_options.logfile, optarg, sizeof( nwipe_options.logfile ) );
+                break;
+
+            case 'e': /* exclude drives option */
+
+                idx_drive_chr = 0;
+                idx_optarg = 0;
+                idx_drive = 0;
+
+                /* Create an array of excluded drives from the comma separated string */
+                while( optarg[idx_optarg] != 0 && idx_drive < MAX_NUMBER_EXCLUDED_DRIVES )
+                {
+                    /* drop the leading '=' character if used */
+                    if( optarg[idx_optarg] == '=' && idx_optarg == 0 )
+                    {
+                        idx_optarg++;
+                        continue;
+                    }
+
+                    if( optarg[idx_optarg] == ',' )
+                    {
+                        /* terminate string and move onto next drive */
+                        nwipe_options.exclude[idx_drive++][idx_drive_chr] = 0;
+                        idx_drive_chr = 0;
+                        idx_optarg++;
+                    }
+                    else
+                    {
+                        if( idx_drive_chr < MAX_DRIVE_PATH_LENGTH )
+                        {
+                            nwipe_options.exclude[idx_drive][idx_drive_chr++] = optarg[idx_optarg++];
+                        }
+                        else
+                        {
+                            /* This section deals with file names that exceed MAX_DRIVE_PATH_LENGTH */
+                            nwipe_options.exclude[idx_drive][idx_drive_chr] = 0;
+                            while( optarg[idx_optarg] != 0 && optarg[idx_optarg] != ',' )
+                            {
+                                idx_optarg++;
+                            }
+                        }
+                    }
+                }
+                break;
+
+            case 'h': /* Display help. */
+
+                display_help();
+                break;
+
+            case 'p': /* PRNG option. */
+
+                if( strcmp( optarg, "mersenne" ) == 0 || strcmp( optarg, "twister" ) == 0 )
+                {
+                    nwipe_options.prng = &nwipe_twister;
+                    break;
+                }
+
+                if( strcmp( optarg, "isaac" ) == 0 )
+                {
+                    nwipe_options.prng = &nwipe_isaac;
+                    break;
+                }
+
+                if( strcmp( optarg, "isaac64" ) == 0 )
+                {
+                    nwipe_options.prng = &nwipe_isaac64;
+                    break;
+                }
+
+                /* Else we do not know this PRNG. */
+                fprintf( stderr, "Error: Unknown prng '%s'.\n", optarg );
+                exit( EINVAL );
+
+            case 'q': /* Anonymize serial numbers */
+
+                nwipe_options.quiet = 1;
+                break;
+
+            case 'r': /* Rounds option. */
+
+                if( sscanf( optarg, " %i", &nwipe_options.rounds ) != 1 || nwipe_options.rounds < 1 )
+                {
+                    fprintf( stderr, "Error: The rounds argument must be a positive integer.\n" );
+                    exit( EINVAL );
+                }
+
+                break;
+
+            case 'v': /* verbose */
+
+                nwipe_options.verbose = 1;
+                break;
+
+            case 'V': /* Version option. */
+
+                printf( "%s version %s\n", program_name, version_string );
+                exit( EXIT_SUCCESS );
+
+            default:
+
+                /* Bogus command line argument. */
+                display_help();
+                exit( EINVAL );
+
+        } /* method */
+
+    } /* command line options */
+
+    /* Return the number of options that were processed. */
+    return optind;
+}
+
+void nwipe_options_log( void )
+{
+    extern nwipe_prng_t nwipe_twister;
+    extern nwipe_prng_t nwipe_isaac;
+    extern nwipe_prng_t nwipe_isaac64;
+
+    /**
+     *  Prints a manifest of options to the log.
+     */
+
+    nwipe_log( NWIPE_LOG_NOTICE, "Program options are set as follows..." );
+
+    if( nwipe_options.autonuke )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  autonuke = %i (on)", nwipe_options.autonuke );
+    }
+    else
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  autonuke = %i (off)", nwipe_options.autonuke );
+    }
+
+    if( nwipe_options.autopoweroff )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  autopoweroff = %i (on)", nwipe_options.autopoweroff );
+    }
+    else
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  autopoweroff = %i (off)", nwipe_options.autopoweroff );
+    }
+
+    if( nwipe_options.noblank )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  do not perform a final blank pass" );
+    }
+
+    if( nwipe_options.nowait )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  do not wait for a key before exiting" );
+    }
+
+    if( nwipe_options.nosignals )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  do not allow signals to interrupt a wipe" );
+    }
+
+    if( nwipe_options.nogui )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  do not show GUI interface" );
+    }
+
+    nwipe_log( NWIPE_LOG_NOTICE, "  banner   = %s", banner );
+
+    if( nwipe_options.prng == &nwipe_twister )
+    {
+        nwipe_log( NWIPE_LOG_NOTICE, "  prng     = Mersenne Twister" );
+    }
+    else
+    {
+        if( nwipe_options.prng == &nwipe_isaac )
+        {
+            nwipe_log( NWIPE_LOG_NOTICE, "  prng     = Isaac" );
+        }
+        else
+        {
+            if( nwipe_options.prng == &nwipe_isaac64 )
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "  prng     = Isaac64" );
+            }
+            else
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "  prng     = Undefined" );
+            }
+        }
+    }
+
+    nwipe_log( NWIPE_LOG_NOTICE, "  method   = %s", nwipe_method_label( nwipe_options.method ) );
+    nwipe_log( NWIPE_LOG_NOTICE, "  quiet    = %i", nwipe_options.quiet );
+    nwipe_log( NWIPE_LOG_NOTICE, "  rounds   = %i", nwipe_options.rounds );
+    nwipe_log( NWIPE_LOG_NOTICE, "  sync     = %i", nwipe_options.sync );
+
+    switch( nwipe_options.verify )
+    {
+        case NWIPE_VERIFY_NONE:
+            nwipe_log( NWIPE_LOG_NOTICE, "  verify   = %i (off)", nwipe_options.verify );
+            break;
+
+        case NWIPE_VERIFY_LAST:
+            nwipe_log( NWIPE_LOG_NOTICE, "  verify   = %i (last pass)", nwipe_options.verify );
+            break;
+
+        case NWIPE_VERIFY_ALL:
+            nwipe_log( NWIPE_LOG_NOTICE, "  verify   = %i (all passes)", nwipe_options.verify );
+            break;
+
+        default:
+            nwipe_log( NWIPE_LOG_NOTICE, "  verify   = %i", nwipe_options.verify );
+            break;
+    }
+}
+
+void display_help()
+{
+    /**
+     * displays the help section to STDOUT and exits.
+     */
+
+    printf( "Usage: %s [options] [device1] [device2] ...\n", program_name );
+    printf( "Options:\n" );
+    /* Limit line length to a maximum of 80 characters so it looks good in 80x25 terminals i.e shredos */
+    /*  ___12345678901234567890123456789012345678901234567890123456789012345678901234567890< Do not exceed */
+    puts( "  -V, --version           Prints the version number\n" );
+    puts( "  -v, --verbose           Prints more messages to the log\n" );
+    puts( "  -h, --help              Prints this help\n" );
+    puts( "      --autonuke          If no devices have been specified on the command line," );
+    puts( "                          starts wiping all devices immediately. If devices have" );
+    puts( "                          been specified, starts wiping only those specified" );
+    puts( "                          devices immediately.\n" );
+    puts( "      --autopoweroff      Power off system on completion of wipe delayed for" );
+    puts( "                          for one minute. During this one minute delay you can" );
+    puts( "                          abort the shutdown by typing sudo shutdown -c\n" );
+    printf( "      --sync=NUM          Will perform a sync after NUM writes (default: %d)\n", DEFAULT_SYNC_RATE );
+    puts( "                          0    - fdatasync after the disk is completely written" );
+    puts( "                                 fdatasync errors not detected until completion." );
+    puts( "                                 0 is not recommended as disk errors may cause" );
+    puts( "                                 nwipe to appear to hang" );
+    puts( "                          1    - fdatasync after every write" );
+    puts( "                                 Warning: Lower values will reduce wipe speeds." );
+    puts( "                          1000 - fdatasync after 1000 writes etc.\n" );
+    puts( "      --verify=TYPE       Whether to perform verification of erasure" );
+    puts( "                          (default: last)" );
+    puts( "                          off   - Do not verify" );
+    puts( "                          last  - Verify after the last pass" );
+    puts( "                          all   - Verify every pass\n" );
+    puts( "  -m, --method=METHOD     The wiping method. See man page for more details." );
+    puts( "                          (default: dodshort)" );
+    puts( "                          dod522022m / dod       - 7 pass DOD 5220.22-M method" );
+    puts( "                          dodshort / dod3pass    - 3 pass DOD method" );
+    puts( "                          gutmann                - Peter Gutmann's Algorithm" );
+    puts( "                          ops2                   - RCMP TSSIT OPS-II" );
+    puts( "                          random / prng / stream - PRNG Stream" );
+    puts( "                          zero / quick           - Overwrite with zeros" );
+    puts( "                          one                    - Overwrite with ones (0xFF)" );
+    puts( "                          verify_zero            - Verifies disk is zero filled" );
+    puts( "                          verify_one             - Verifies disk is 0xFF filled\n" );
+    puts( "  -l, --logfile=FILE      Filename to log to. Default is STDOUT\n" );
+    puts( "  -p, --prng=METHOD       PRNG option (mersenne|twister|isaac|isaac64)\n" );
+    puts( "  -q, --quiet             Anonymize logs and the GUI by removing unique data, i.e." );
+    puts( "                          serial numbers, LU WWN Device ID, and SMBIOS/DMI data" );
+    puts( "                          XXXXXX = S/N exists, ????? = S/N not obtainable\n" );
+    puts( "  -r, --rounds=NUM        Number of times to wipe the device using the selected" );
+    puts( "                          method (default: 1)\n" );
+    puts( "      --noblank           Do NOT blank disk after wipe" );
+    puts( "                          (default is to complete a final blank pass)\n" );
+    puts( "      --nowait            Do NOT wait for a key before exiting" );
+    puts( "                          (default is to wait)\n" );
+    puts( "      --nosignals         Do NOT allow signals to interrupt a wipe" );
+    puts( "                          (default is to allow)\n" );
+    puts( "      --nogui             Do NOT show the GUI interface. Automatically invokes" );
+    puts( "                          the nowait option. Must be used with the --autonuke" );
+    puts( "                          option. Send SIGUSR1 to log current stats\n" );
+    puts( "      --nousb             Do NOT show or wipe any USB devices whether in GUI" );
+    puts( "                          mode, --nogui or --autonuke modes.\n" );
+    puts( "  -e, --exclude=DEVICES   Up to ten comma separated devices to be excluded" );
+    puts( "                          --exclude=/dev/sdc" );
+    puts( "                          --exclude=/dev/sdc,/dev/sdd" );
+    puts( "                          --exclude=/dev/sdc,/dev/sdd,/dev/mapper/cryptswap1\n" );
+    puts( "" );
+    exit( EXIT_SUCCESS );
+}
diff --git a/src/options.h b/src/options.h
new file mode 100644
index 0000000..f70a3ec
--- /dev/null
+++ b/src/options.h
@@ -0,0 +1,72 @@
+/*
+ *  options.h: Command line processing routines for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef OPTIONS_H_
+#define OPTIONS_H_
+
+/* Program knobs. */
+#define NWIPE_KNOB_ENTROPY "/dev/urandom"
+#define NWIPE_KNOB_IDENTITY_SIZE 512
+#define NWIPE_KNOB_LABEL_SIZE 128
+#define NWIPE_KNOB_LOADAVG "/proc/loadavg"
+#define NWIPE_KNOB_LOG_BUFFERSIZE 1024  // Maximum length of a log event.
+#define NWIPE_KNOB_PARTITIONS "/proc/partitions"
+#define NWIPE_KNOB_PARTITIONS_PREFIX "/dev/"
+#define NWIPE_KNOB_PRNG_STATE_LENGTH 512  // 128 words
+#define NWIPE_KNOB_SCSI "/proc/scsi/scsi"
+#define NWIPE_KNOB_SLEEP 1
+#define NWIPE_KNOB_STAT "/proc/stat"
+#define MAX_NUMBER_EXCLUDED_DRIVES 10
+#define MAX_DRIVE_PATH_LENGTH 200  // e.g. /dev/sda is only 8 characters long, so 200 should be plenty.
+#define DEFAULT_SYNC_RATE 100000
+
+/* Function prototypes for loading options from the environment and command line. */
+int nwipe_options_parse( int argc, char** argv );
+void nwipe_options_log( void );
+
+/* Function to display help text */
+void display_help();
+
+typedef struct
+{
+    int autonuke;  // Do not prompt the user for confirmation when set.
+    int autopoweroff;  // Power off on completion of wipe
+    int noblank;  // Do not perform a final blanking pass.
+    int nousb;  // Do not show or wipe any USB devices.
+    int nowait;  // Do not wait for a final key before exiting.
+    int nosignals;  // Do not allow signals to interrupt a wipe.
+    int nogui;  // Do not show the GUI.
+    char* banner;  // The product banner shown on the top line of the screen.
+    void* method;  // A function pointer to the wipe method that will be used.
+    char logfile[FILENAME_MAX];  // The filename to log the output to.
+    char exclude[MAX_NUMBER_EXCLUDED_DRIVES][MAX_DRIVE_PATH_LENGTH];  // Drives excluded from the search.
+    nwipe_prng_t* prng;  // The pseudo random number generator implementation.
+    int quiet;  // Anonymize serial numbers
+    int rounds;  // The number of times that the wipe method should be called.
+    int sync;  // A flag to indicate whether and how often writes should be sync'd.
+    int verbose;  // Make log more verbose
+    nwipe_verify_t verify;  // A flag to indicate whether writes should be verified.
+} nwipe_options_t;
+
+extern nwipe_options_t nwipe_options;
+
+#endif /* OPTIONS_H_ */
diff --git a/src/pass.c b/src/pass.c
new file mode 100644
index 0000000..3f6487a
--- /dev/null
+++ b/src/pass.c
@@ -0,0 +1,866 @@
+/*
+ *  pass.c: Routines that read and write patterns to block devices.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdint.h>
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "prng.h"
+#include "options.h"
+#include "pass.h"
+#include "logging.h"
+#include "gui.h"
+
+int nwipe_random_verify( nwipe_context_t* c )
+{
+    /**
+     * Verifies that a random pass was correctly written to the device.
+     *
+     */
+
+    /* The result holder. */
+    int r;
+
+    /* The IO size. */
+    size_t blocksize;
+
+    /* The result buffer for calls to lseek. */
+    off64_t offset;
+
+    /* The input buffer. */
+    char* b;
+
+    /* The pattern buffer that is used to check the input buffer. */
+    char* d;
+
+    /* The number of bytes remaining in the pass. */
+    u64 z = c->device_size;
+
+    if( c->prng_seed.s == NULL )
+    {
+        nwipe_log( NWIPE_LOG_SANITY, "Null seed pointer." );
+        return -1;
+    }
+
+    if( c->prng_seed.length <= 0 )
+    {
+        nwipe_log( NWIPE_LOG_SANITY, "The entropy length member is %i.", c->prng_seed.length );
+        return -1;
+    }
+
+    /* Create the input buffer. */
+    b = malloc( c->device_stat.st_blksize );
+
+    /* Check the memory allocation. */
+    if( !b )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the input buffer." );
+        return -1;
+    }
+
+    /* Create the pattern buffer */
+    d = malloc( c->device_stat.st_blksize );
+
+    /* Check the memory allocation. */
+    if( !d )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the pattern buffer." );
+        free( b );
+        return -1;
+    }
+
+    /* Reset the file pointer. */
+    offset = lseek( c->device_fd, 0, SEEK_SET );
+
+    /* Reset the pass byte counter. */
+    c->pass_done = 0;
+
+    if( offset == (off64_t) -1 )
+    {
+        nwipe_perror( errno, __FUNCTION__, "lseek" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to reset the '%s' file offset.", c->device_name );
+        free( b );
+        free( d );
+        return -1;
+    }
+
+    if( offset != 0 )
+    {
+        /* This is system insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "lseek() returned a bogus offset on '%s'.", c->device_name );
+        free( b );
+        free( d );
+        return -1;
+    }
+
+    /* Tell our parent that we are syncing the device. */
+    c->sync_status = 1;
+
+    /* Sync the device. */
+    r = fdatasync( c->device_fd );
+
+    /* Tell our parent that we have finished syncing the device. */
+    c->sync_status = 0;
+
+    if( r != 0 )
+    {
+        /* FIXME: Is there a better way to handle this? */
+        nwipe_perror( errno, __FUNCTION__, "fdatasync" );
+        nwipe_log( NWIPE_LOG_WARNING, "Buffer flush failure on '%s'.", c->device_name );
+        c->fsyncdata_errors++;
+    }
+
+    /* Reseed the PRNG. */
+    c->prng->init( &c->prng_state, &c->prng_seed );
+
+    while( z > 0 )
+    {
+        if( c->device_stat.st_blksize <= z )
+        {
+            blocksize = c->device_stat.st_blksize;
+        }
+        else
+        {
+            /* This is a seatbelt for buggy drivers and programming errors because */
+            /* the device size should always be an even multiple of its blocksize. */
+            blocksize = z;
+            nwipe_log( NWIPE_LOG_WARNING,
+                       "%s: The size of '%s' is not a multiple of its block size %i.",
+                       __FUNCTION__,
+                       c->device_name,
+                       c->device_stat.st_blksize );
+        }
+
+        /* Fill the output buffer with the random pattern. */
+        c->prng->read( &c->prng_state, d, blocksize );
+
+        /* Read the buffer in from the device. */
+        r = read( c->device_fd, b, blocksize );
+
+        /* Check the result. */
+        if( r < 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "read" );
+            nwipe_log( NWIPE_LOG_ERROR, "Unable to read from '%s'.", c->device_name );
+            return -1;
+        }
+
+        /* Check for a partial read. */
+        if( r != blocksize )
+        {
+            /* TODO: Handle a partial read. */
+
+            /* The number of bytes that were not read. */
+            int s = blocksize - r;
+
+            nwipe_log(
+                NWIPE_LOG_WARNING, "%s: Partial read from '%s', %i bytes short.", __FUNCTION__, c->device_name, s );
+
+            /* Increment the error count. */
+            c->verify_errors += 1;
+
+            /* Bump the file pointer to the next block. */
+            offset = lseek( c->device_fd, s, SEEK_CUR );
+
+            if( offset == (off64_t) -1 )
+            {
+                nwipe_perror( errno, __FUNCTION__, "lseek" );
+                nwipe_log(
+                    NWIPE_LOG_ERROR, "Unable to bump the '%s' file offset after a partial read.", c->device_name );
+                return -1;
+            }
+
+        } /* partial read */
+
+        /* Compare buffer contents. */
+        if( memcmp( b, d, blocksize ) != 0 )
+        {
+            c->verify_errors += 1;
+        }
+
+        /* Decrement the bytes remaining in this pass. */
+        z -= r;
+
+        /* Increment the total progress counters. */
+        c->pass_done += r;
+        c->round_done += r;
+
+        pthread_testcancel();
+
+    } /* while bytes remaining */
+
+    /* Release the buffers. */
+    free( b );
+    free( d );
+
+    /* We're done. */
+    return 0;
+
+} /* nwipe_random_verify */
+
+int nwipe_random_pass( NWIPE_METHOD_SIGNATURE )
+{
+    /**
+     * Writes a random pattern to the device.
+     *
+     */
+
+    /* The result holder. */
+    int r;
+
+    /* The IO size. */
+    size_t blocksize;
+
+    /* The result buffer for calls to lseek. */
+    off64_t offset;
+
+    /* The output buffer. */
+    char* b;
+
+    /* The number of bytes remaining in the pass. */
+    u64 z = c->device_size;
+
+    /* Number of writes to do before a fdatasync. */
+    int syncRate = nwipe_options.sync;
+
+    /* Counter to track when to do a fdatasync. */
+    int i = 0;
+
+    /* general index counter */
+    int idx;
+
+    if( c->prng_seed.s == NULL )
+    {
+        nwipe_log( NWIPE_LOG_SANITY, "__FUNCTION__: Null seed pointer." );
+        return -1;
+    }
+
+    if( c->prng_seed.length <= 0 )
+    {
+        nwipe_log( NWIPE_LOG_SANITY, "__FUNCTION__: The entropy length member is %i.", c->prng_seed.length );
+        return -1;
+    }
+
+    /* Create the initialised output buffer. Initialised because we don't want memory leaks
+     * to disk in the event of some future undetected bug in a prng or its implementation. */
+    b = calloc( c->device_stat.st_blksize, sizeof( char ) );
+
+    /* Check the memory allocation. */
+    if( !b )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the output buffer." );
+        return -1;
+    }
+
+    /* Seed the PRNG. */
+    c->prng->init( &c->prng_state, &c->prng_seed );
+
+    /* Reset the file pointer. */
+    offset = lseek( c->device_fd, 0, SEEK_SET );
+
+    /* Reset the pass byte counter. */
+    c->pass_done = 0;
+
+    if( offset == (off64_t) -1 )
+    {
+        nwipe_perror( errno, __FUNCTION__, "lseek" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to reset the '%s' file offset.", c->device_name );
+        free( b );
+        return -1;
+    }
+
+    if( offset != 0 )
+    {
+        /* This is system insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "__FUNCTION__: lseek() returned a bogus offset on '%s'.", c->device_name );
+        free( b );
+        return -1;
+    }
+
+    while( z > 0 )
+    {
+        if( c->device_stat.st_blksize <= z )
+        {
+            blocksize = c->device_stat.st_blksize;
+        }
+        else
+        {
+            /* This is a seatbelt for buggy drivers and programming errors because */
+            /* the device size should always be an even multiple of its blocksize. */
+            blocksize = z;
+            nwipe_log( NWIPE_LOG_WARNING,
+                       "%s: The size of '%s' is not a multiple of its block size %i.",
+                       __FUNCTION__,
+                       c->device_name,
+                       c->device_stat.st_blksize );
+        }
+
+        /* Fill the output buffer with the random pattern. */
+        c->prng->read( &c->prng_state, b, blocksize );
+
+        /* For the first block only, check the prng actually wrote something to the buffer */
+        if( z == c->device_size )
+        {
+            idx = c->device_stat.st_blksize;
+            while( idx > 0 )
+            {
+                if( b[idx] != 0 )
+                {
+                    nwipe_log( NWIPE_LOG_NOTICE, "prng stream is active" );
+                    break;
+                }
+                idx--;
+            }
+            if( idx == 0 )
+            {
+                nwipe_log( NWIPE_LOG_FATAL, "ERROR, prng wrote nothing to the buffer" );
+                return -1;
+            }
+        }
+
+        /* Write the next block out to the device. */
+        r = write( c->device_fd, b, blocksize );
+
+        /* Check the result for a fatal error. */
+        if( r < 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "write" );
+            nwipe_log( NWIPE_LOG_FATAL, "Unable to read from '%s'.", c->device_name );
+            return -1;
+        }
+
+        /* Check for a partial write. */
+        if( r != blocksize )
+        {
+            /* TODO: Handle a partial write. */
+
+            /* The number of bytes that were not written. */
+            int s = blocksize - r;
+
+            /* Increment the error count by the number of bytes that were not written. */
+            c->pass_errors += s;
+
+            nwipe_log( NWIPE_LOG_WARNING, "Partial write on '%s', %i bytes short.", c->device_name, s );
+
+            /* Bump the file pointer to the next block. */
+            offset = lseek( c->device_fd, s, SEEK_CUR );
+
+            if( offset == (off64_t) -1 )
+            {
+                nwipe_perror( errno, __FUNCTION__, "lseek" );
+                nwipe_log(
+                    NWIPE_LOG_ERROR, "Unable to bump the '%s' file offset after a partial write.", c->device_name );
+                return -1;
+            }
+
+        } /* partial write */
+
+        /* Decrement the bytes remaining in this pass. */
+        z -= r;
+
+        /* Increment the total progress counters. */
+        c->pass_done += r;
+        c->round_done += r;
+
+        /* Perodic Sync */
+        if( syncRate > 0 )
+        {
+            i++;
+
+            if( i >= syncRate )
+            {
+                /* Tell our parent that we are syncing the device. */
+                c->sync_status = 1;
+
+                /* Sync the device. */
+                r = fdatasync( c->device_fd );
+
+                /* Tell our parent that we have finished syncing the device. */
+                c->sync_status = 0;
+
+                if( r != 0 )
+                {
+                    nwipe_perror( errno, __FUNCTION__, "fdatasync" );
+                    nwipe_log( NWIPE_LOG_WARNING, "Buffer flush failure on '%s'.", c->device_name );
+                    nwipe_log( NWIPE_LOG_WARNING, "Wrote %llu bytes on '%s'.", c->pass_done, c->device_name );
+                    c->fsyncdata_errors++;
+                    free( b );
+                    return -1;
+                }
+
+                i = 0;
+            }
+        }
+
+        pthread_testcancel();
+
+    } /* remaining bytes */
+
+    /* Release the output buffer. */
+    free( b );
+
+    /* Tell our parent that we are syncing the device. */
+    c->sync_status = 1;
+
+    /* Sync the device. */
+    r = fdatasync( c->device_fd );
+
+    /* Tell our parent that we have finished syncing the device. */
+    c->sync_status = 0;
+
+    if( r != 0 )
+    {
+        /* FIXME: Is there a better way to handle this? */
+        nwipe_perror( errno, __FUNCTION__, "fdatasync" );
+        nwipe_log( NWIPE_LOG_WARNING, "Buffer flush failure on '%s'.", c->device_name );
+        c->fsyncdata_errors++;
+    }
+
+    /* We're done. */
+    return 0;
+
+} /* nwipe_random_pass */
+
+int nwipe_static_verify( NWIPE_METHOD_SIGNATURE, nwipe_pattern_t* pattern )
+{
+    /**
+     * Verifies that a static pass was correctly written to the device.
+     */
+
+    /* The result holder. */
+    int r;
+
+    /* The IO size. */
+    size_t blocksize;
+
+    /* The result buffer for calls to lseek. */
+    off64_t offset;
+
+    /* The input buffer. */
+    char* b;
+
+    /* The pattern buffer that is used to check the input buffer. */
+    char* d;
+
+    /* A pointer into the pattern buffer. */
+    char* q;
+
+    /* The pattern buffer window offset. */
+    int w = 0;
+
+    /* The number of bytes remaining in the pass. */
+    u64 z = c->device_size;
+
+    if( pattern == NULL )
+    {
+        /* Caught insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "nwipe_static_verify: Null entropy pointer." );
+        return -1;
+    }
+
+    if( pattern->length <= 0 )
+    {
+        /* Caught insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "nwipe_static_verify: The pattern length member is %i.", pattern->length );
+        return -1;
+    }
+
+    /* Create the input buffer. */
+    b = malloc( c->device_stat.st_blksize );
+
+    /* Check the memory allocation. */
+    if( !b )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the input buffer." );
+        return -1;
+    }
+
+    /* Create the pattern buffer */
+    d = malloc( c->device_stat.st_blksize + pattern->length * 2 );
+
+    /* Check the memory allocation. */
+    if( !d )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the pattern buffer." );
+        free( b );
+        return -1;
+    }
+
+    for( q = d; q < d + c->device_stat.st_blksize + pattern->length; q += pattern->length )
+    {
+        /* Fill the pattern buffer with the pattern. */
+        memcpy( q, pattern->s, pattern->length );
+    }
+
+    /* Tell our parent that we are syncing the device. */
+    c->sync_status = 1;
+
+    /* Sync the device. */
+    r = fdatasync( c->device_fd );
+
+    /* Tell our parent that we have finished syncing the device. */
+    c->sync_status = 0;
+
+    if( r != 0 )
+    {
+        /* FIXME: Is there a better way to handle this? */
+        nwipe_perror( errno, __FUNCTION__, "fdatasync" );
+        nwipe_log( NWIPE_LOG_WARNING, "Buffer flush failure on '%s'.", c->device_name );
+        c->fsyncdata_errors++;
+    }
+
+    /* Reset the file pointer. */
+    offset = lseek( c->device_fd, 0, SEEK_SET );
+
+    /* Reset the pass byte counter. */
+    c->pass_done = 0;
+
+    if( offset == (off64_t) -1 )
+    {
+        nwipe_perror( errno, __FUNCTION__, "lseek" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to reset the '%s' file offset.", c->device_name );
+        free( b );
+        return -1;
+    }
+
+    if( offset != 0 )
+    {
+        /* This is system insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "nwipe_static_verify: lseek() returned a bogus offset on '%s'.", c->device_name );
+        free( b );
+        free( d );
+        return -1;
+    }
+
+    while( z > 0 )
+    {
+        if( c->device_stat.st_blksize <= z )
+        {
+            blocksize = c->device_stat.st_blksize;
+        }
+        else
+        {
+            /* This is a seatbelt for buggy drivers and programming errors because */
+            /* the device size should always be an even multiple of its blocksize. */
+            blocksize = z;
+            nwipe_log( NWIPE_LOG_WARNING,
+                       "%s: The size of '%s' is not a multiple of its block size %i.",
+                       __FUNCTION__,
+                       c->device_name,
+                       c->device_stat.st_blksize );
+        }
+
+        /* Fill the output buffer with the random pattern. */
+        /* Read the buffer in from the device. */
+        r = read( c->device_fd, b, blocksize );
+
+        /* Check the result. */
+        if( r < 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "read" );
+            nwipe_log( NWIPE_LOG_ERROR, "Unable to read from '%s'.", c->device_name );
+            return -1;
+        }
+
+        /* Check for a partial read. */
+        if( r == blocksize )
+        {
+            /* Check every byte in the buffer. */
+            if( memcmp( b, &d[w], r ) != 0 )
+            {
+                c->verify_errors += 1;
+            }
+        }
+        else
+        {
+            /* The number of bytes that were not read. */
+            int s = blocksize - r;
+
+            /* TODO: Handle a partial read. */
+
+            /* Increment the error count. */
+            c->verify_errors += 1;
+
+            nwipe_log( NWIPE_LOG_WARNING, "Partial read on '%s', %i bytes short.", c->device_name, s );
+
+            /* Bump the file pointer to the next block. */
+            offset = lseek( c->device_fd, s, SEEK_CUR );
+
+            if( offset == (off64_t) -1 )
+            {
+                nwipe_perror( errno, __FUNCTION__, "lseek" );
+                nwipe_log(
+                    NWIPE_LOG_ERROR, "Unable to bump the '%s' file offset after a partial read.", c->device_name );
+                return -1;
+            }
+
+        } /* partial read */
+
+        /* Adjust the window. */
+        w = ( c->device_stat.st_blksize + w ) % pattern->length;
+
+        /* Intuition check:
+         *   If the pattern length evenly divides the block size
+         *   then ( w == 0 ) always.
+         */
+
+        /* Decrement the bytes remaining in this pass. */
+        z -= r;
+
+        /* Increment the total progress counters. */
+        c->pass_done += r;
+        c->round_done += r;
+
+        pthread_testcancel();
+
+    } /* while bytes remaining */
+
+    /* Release the buffers. */
+    free( b );
+    free( d );
+
+    /* We're done. */
+    return 0;
+
+} /* nwipe_static_verify */
+
+int nwipe_static_pass( NWIPE_METHOD_SIGNATURE, nwipe_pattern_t* pattern )
+{
+    /**
+     * Writes a static pattern to the device.
+     */
+
+    /* The result holder. */
+    int r;
+
+    /* The IO size. */
+    size_t blocksize;
+
+    /* The result buffer for calls to lseek. */
+    off64_t offset;
+
+    /* The output buffer. */
+    char* b;
+
+    /* A pointer into the output buffer. */
+    char* p;
+
+    /* The output buffer window offset. */
+    int w = 0;
+
+    /* The number of bytes remaining in the pass. */
+    u64 z = c->device_size;
+
+    /* Number of writes to do before a fdatasync. */
+    int syncRate = nwipe_options.sync;
+
+    /* Counter to track when to do a fdatasync. */
+    int i = 0;
+
+    if( pattern == NULL )
+    {
+        /* Caught insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "__FUNCTION__: Null pattern pointer." );
+        return -1;
+    }
+
+    if( pattern->length <= 0 )
+    {
+        /* Caught insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "__FUNCTION__: The pattern length member is %i.", pattern->length );
+        return -1;
+    }
+
+    /* Create the output buffer. */
+    b = malloc( c->device_stat.st_blksize + pattern->length * 2 );
+
+    /* Check the memory allocation. */
+    if( !b )
+    {
+        nwipe_perror( errno, __FUNCTION__, "malloc" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the pattern buffer." );
+        return -1;
+    }
+
+    for( p = b; p < b + c->device_stat.st_blksize + pattern->length; p += pattern->length )
+    {
+        /* Fill the output buffer with the pattern. */
+        memcpy( p, pattern->s, pattern->length );
+    }
+    ///
+    /* Reset the file pointer. */
+    offset = lseek( c->device_fd, 0, SEEK_SET );
+
+    /* Reset the pass byte counter. */
+    c->pass_done = 0;
+
+    if( offset == (off64_t) -1 )
+    {
+        nwipe_perror( errno, __FUNCTION__, "lseek" );
+        nwipe_log( NWIPE_LOG_FATAL, "Unable to reset the '%s' file offset.", c->device_name );
+        return -1;
+    }
+
+    if( offset != 0 )
+    {
+        /* This is system insanity. */
+        nwipe_log( NWIPE_LOG_SANITY, "__FUNCTION__: lseek() returned a bogus offset on '%s'.", c->device_name );
+        return -1;
+    }
+
+    while( z > 0 )
+    {
+        if( c->device_stat.st_blksize <= z )
+        {
+            blocksize = c->device_stat.st_blksize;
+        }
+        else
+        {
+            /* This is a seatbelt for buggy drivers and programming errors because */
+            /* the device size should always be an even multiple of its blocksize. */
+            blocksize = z;
+            nwipe_log( NWIPE_LOG_WARNING,
+                       "%s: The size of '%s' is not a multiple of its block size %i.",
+                       __FUNCTION__,
+                       c->device_name,
+                       c->device_stat.st_blksize );
+        }
+
+        /* Fill the output buffer with the random pattern. */
+        /* Write the next block out to the device. */
+        r = write( c->device_fd, &b[w], blocksize );
+
+        /* Check the result for a fatal error. */
+        if( r < 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "write" );
+            nwipe_log( NWIPE_LOG_FATAL, "Unable to write to '%s'.", c->device_name );
+            return -1;
+        }
+
+        /* Check for a partial write. */
+        if( r != blocksize )
+        {
+            /* TODO: Handle a partial write. */
+
+            /* The number of bytes that were not written. */
+            int s = blocksize - r;
+
+            /* Increment the error count. */
+            c->pass_errors += s;
+
+            nwipe_log( NWIPE_LOG_WARNING, "Partial write on '%s', %i bytes short.", c->device_name, s );
+
+            /* Bump the file pointer to the next block. */
+            offset = lseek( c->device_fd, s, SEEK_CUR );
+
+            if( offset == (off64_t) -1 )
+            {
+                nwipe_perror( errno, __FUNCTION__, "lseek" );
+                nwipe_log(
+                    NWIPE_LOG_ERROR, "Unable to bump the '%s' file offset after a partial write.", c->device_name );
+                return -1;
+            }
+
+        } /* partial write */
+
+        /* Adjust the window. */
+        w = ( c->device_stat.st_blksize + w ) % pattern->length;
+
+        /* Intuition check:
+         *
+         *   If the pattern length evenly divides the block size
+         *   then ( w == 0 ) always.
+         */
+
+        /* Decrement the bytes remaining in this pass. */
+        z -= r;
+
+        /* Increment the total progress counterr. */
+        c->pass_done += r;
+        c->round_done += r;
+
+        /* Perodic Sync */
+        if( syncRate > 0 )
+        {
+            i++;
+
+            if( i >= syncRate )
+            {
+                /* Tell our parent that we are syncing the device. */
+                c->sync_status = 1;
+
+                /* Sync the device. */
+                r = fdatasync( c->device_fd );
+
+                /* Tell our parent that we have finished syncing the device. */
+                c->sync_status = 0;
+
+                if( r != 0 )
+                {
+                    nwipe_perror( errno, __FUNCTION__, "fdatasync" );
+                    nwipe_log( NWIPE_LOG_WARNING, "Buffer flush failure on '%s'.", c->device_name );
+                    nwipe_log( NWIPE_LOG_WARNING, "Wrote %llu bytes on '%s'.", c->pass_done, c->device_name );
+                    c->fsyncdata_errors++;
+                    free( b );
+                    return -1;
+                }
+
+                i = 0;
+            }
+        }
+
+        pthread_testcancel();
+
+    } /* remaining bytes */
+
+    /* Tell our parent that we are syncing the device. */
+    c->sync_status = 1;
+
+    /* Sync the device. */
+    r = fdatasync( c->device_fd );
+
+    /* Tell our parent that we have finished syncing the device. */
+    c->sync_status = 0;
+
+    if( r != 0 )
+    {
+        /* FIXME: Is there a better way to handle this? */
+        nwipe_perror( errno, __FUNCTION__, "fdatasync" );
+        nwipe_log( NWIPE_LOG_WARNING, "Buffer flush failure on '%s'.", c->device_name );
+        c->fsyncdata_errors++;
+    }
+
+    /* Release the output buffer. */
+    free( b );
+
+    /* We're done. */
+    return 0;
+
+} /* nwipe_static_pass */
diff --git a/src/pass.h b/src/pass.h
new file mode 100644
index 0000000..8f27f43
--- /dev/null
+++ b/src/pass.h
@@ -0,0 +1,33 @@
+/*
+ *  pass.h: Routines that read and write patterns to block devices.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef PASS_H_
+#define PASS_H_
+
+int nwipe_random_pass( nwipe_context_t* c );
+int nwipe_random_verify( nwipe_context_t* c );
+int nwipe_static_pass( nwipe_context_t* c, nwipe_pattern_t* pattern );
+int nwipe_static_verify( nwipe_context_t* c, nwipe_pattern_t* pattern );
+
+void test_functionn( int count, nwipe_context_t** c );
+
+#endif /* PASS_H_ */
diff --git a/src/prng.c b/src/prng.c
new file mode 100644
index 0000000..72c9305
--- /dev/null
+++ b/src/prng.c
@@ -0,0 +1,252 @@
+/*
+ *  prng.c: Pseudo Random Number Generator abstractions for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "nwipe.h"
+#include "prng.h"
+#include "context.h"
+#include "logging.h"
+
+#include "mt19937ar-cok/mt19937ar-cok.h"
+#include "isaac_rand/isaac_rand.h"
+#include "isaac_rand/isaac64.h"
+
+nwipe_prng_t nwipe_twister = { "Mersenne Twister (mt19937ar-cok)", nwipe_twister_init, nwipe_twister_read };
+
+nwipe_prng_t nwipe_isaac = { "ISAAC (rand.c 20010626)", nwipe_isaac_init, nwipe_isaac_read };
+nwipe_prng_t nwipe_isaac64 = { "ISAAC-64 (isaac64.c)", nwipe_isaac64_init, nwipe_isaac64_read };
+
+/* Print given number of bytes from unsigned integer number to a byte stream buffer starting with low-endian. */
+static inline void u32_to_buffer( u8* restrict buffer, u32 val, const int len )
+{
+    for( int i = 0; i < len; ++i )
+    {
+        buffer[i] = ( u8 )( val & 0xFFUL );
+        val >>= 8;
+    }
+}
+static inline void u64_to_buffer( u8* restrict buffer, u64 val, const int len )
+{
+    for( int i = 0; i < len; ++i )
+    {
+        buffer[i] = ( u8 )( val & 0xFFULL );
+        val >>= 8;
+    }
+}
+static inline u32 isaac_nextval( randctx* restrict ctx )
+{
+    if( ctx->randcnt == 0 )
+    {
+        isaac( ctx );
+        ctx->randcnt = RANDSIZ;
+    }
+    ctx->randcnt--;
+    return ctx->randrsl[ctx->randcnt];
+}
+static inline u64 isaac64_nextval( rand64ctx* restrict ctx )
+{
+    if( ctx->randcnt == 0 )
+    {
+        isaac64( ctx );
+        ctx->randcnt = RANDSIZ;
+    }
+    ctx->randcnt--;
+    return ctx->randrsl[ctx->randcnt];
+}
+
+int nwipe_twister_init( NWIPE_PRNG_INIT_SIGNATURE )
+{
+    nwipe_log( NWIPE_LOG_NOTICE, "Initialising Mersenne Twister prng" );
+
+    if( *state == NULL )
+    {
+        /* This is the first time that we have been called. */
+        *state = malloc( sizeof( twister_state_t ) );
+    }
+    twister_init( (twister_state_t*) *state, (u32*) ( seed->s ), seed->length / sizeof( u32 ) );
+    return 0;
+}
+
+int nwipe_twister_read( NWIPE_PRNG_READ_SIGNATURE )
+{
+    u8* restrict bufpos = buffer;
+    size_t words = count / SIZE_OF_TWISTER;  // the values of twister_genrand_int32 is strictly 4 bytes
+
+    /* Twister returns 4-bytes per call, so progress by 4 bytes. */
+    for( size_t ii = 0; ii < words; ++ii )
+    {
+        u32_to_buffer( bufpos, twister_genrand_int32( (twister_state_t*) *state ), SIZE_OF_TWISTER );
+        bufpos += SIZE_OF_TWISTER;
+    }
+
+    /* If there is some remainder copy only relevant number of bytes to not
+     * overflow the buffer. */
+    const size_t remain = count % SIZE_OF_TWISTER;  // SIZE_OF_TWISTER is strictly 4 bytes
+    if( remain > 0 )
+    {
+        u32_to_buffer( bufpos, twister_genrand_int32( (twister_state_t*) *state ), remain );
+    }
+
+    return 0;
+}
+
+int nwipe_isaac_init( NWIPE_PRNG_INIT_SIGNATURE )
+{
+    int count;
+    randctx* isaac_state = *state;
+
+    nwipe_log( NWIPE_LOG_NOTICE, "Initialising Isaac prng" );
+
+    if( *state == NULL )
+    {
+        /* This is the first time that we have been called. */
+        *state = malloc( sizeof( randctx ) );
+        isaac_state = *state;
+
+        /* Check the memory allocation. */
+        if( isaac_state == 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "malloc" );
+            nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the isaac state." );
+            return -1;
+        }
+    }
+
+    /* Take the minimum of the isaac seed size and available entropy. */
+    if( sizeof( isaac_state->randrsl ) < seed->length )
+    {
+        count = sizeof( isaac_state->randrsl );
+    }
+    else
+    {
+        memset( isaac_state->randrsl, 0, sizeof( isaac_state->randrsl ) );
+        count = seed->length;
+    }
+
+    if( count == 0 )
+    {
+        /* Start ISACC without a seed. */
+        randinit( isaac_state, 0 );
+    }
+    else
+    {
+        /* Seed the ISAAC state with entropy. */
+        memcpy( isaac_state->randrsl, seed->s, count );
+
+        /* The second parameter indicates that randrsl is non-empty. */
+        randinit( isaac_state, 1 );
+    }
+
+    return 0;
+}
+
+int nwipe_isaac_read( NWIPE_PRNG_READ_SIGNATURE )
+{
+    randctx* isaac_state = *state;
+    u8* restrict bufpos = buffer;
+    size_t words = count / SIZE_OF_ISAAC;  // the values of isaac is strictly 4 bytes
+
+    /* Isaac returns 4-bytes per call, so progress by 4 bytes. */
+    for( size_t ii = 0; ii < words; ++ii )
+    {
+        /* get the next 32bit random number */
+        u32_to_buffer( bufpos, isaac_nextval( isaac_state ), SIZE_OF_ISAAC );
+        bufpos += SIZE_OF_ISAAC;
+    }
+
+    /* If there is some remainder copy only relevant number of bytes to not overflow the buffer. */
+    const size_t remain = count % SIZE_OF_ISAAC;  // SIZE_OF_ISAAC is strictly 4 bytes
+    if( remain > 0 )
+    {
+        u32_to_buffer( bufpos, isaac_nextval( isaac_state ), remain );
+    }
+
+    return 0;
+}
+
+int nwipe_isaac64_init( NWIPE_PRNG_INIT_SIGNATURE )
+{
+    int count;
+    rand64ctx* isaac_state = *state;
+
+    nwipe_log( NWIPE_LOG_NOTICE, "Initialising ISAAC-64 prng" );
+
+    if( *state == NULL )
+    {
+        /* This is the first time that we have been called. */
+        *state = malloc( sizeof( rand64ctx ) );
+        isaac_state = *state;
+
+        /* Check the memory allocation. */
+        if( isaac_state == 0 )
+        {
+            nwipe_perror( errno, __FUNCTION__, "malloc" );
+            nwipe_log( NWIPE_LOG_FATAL, "Unable to allocate memory for the isaac state." );
+            return -1;
+        }
+    }
+
+    /* Take the minimum of the isaac seed size and available entropy. */
+    if( sizeof( isaac_state->randrsl ) < seed->length )
+    {
+        count = sizeof( isaac_state->randrsl );
+    }
+    else
+    {
+        memset( isaac_state->randrsl, 0, sizeof( isaac_state->randrsl ) );
+        count = seed->length;
+    }
+
+    if( count == 0 )
+    {
+        /* Start ISACC without a seed. */
+        rand64init( isaac_state, 0 );
+    }
+    else
+    {
+        /* Seed the ISAAC state with entropy. */
+        memcpy( isaac_state->randrsl, seed->s, count );
+
+        /* The second parameter indicates that randrsl is non-empty. */
+        rand64init( isaac_state, 1 );
+    }
+
+    return 0;
+}
+
+int nwipe_isaac64_read( NWIPE_PRNG_READ_SIGNATURE )
+{
+    rand64ctx* isaac_state = *state;
+    u8* restrict bufpos = buffer;
+    size_t words = count / SIZE_OF_ISAAC64;  // the values of ISAAC-64 is strictly 8 bytes
+
+    for( size_t ii = 0; ii < words; ++ii )
+    {
+        u64_to_buffer( bufpos, isaac64_nextval( isaac_state ), SIZE_OF_ISAAC64 );
+        bufpos += SIZE_OF_ISAAC64;
+    }
+
+    /* If there is some remainder copy only relevant number of bytes to not overflow the buffer. */
+    const size_t remain = count % SIZE_OF_ISAAC64;  // SIZE_OF_ISAAC64 is strictly 8 bytes
+    if( remain > 0 )
+    {
+        u64_to_buffer( bufpos, isaac64_nextval( isaac_state ), remain );
+    }
+
+    return 0;
+}
diff --git a/src/prng.h b/src/prng.h
new file mode 100644
index 0000000..8dfa3d7
--- /dev/null
+++ b/src/prng.h
@@ -0,0 +1,65 @@
+/*
+ *  prng.h: Pseudo Random Number Generator abstractions for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef PRNG_H_
+#define PRNG_H_
+
+#include <sys/types.h>
+
+/* A chunk of random data. */
+typedef struct
+{
+    size_t length;  // Length of the entropy string in bytes.
+    u8* s;  // The actual bytes of the entropy string.
+} nwipe_entropy_t;
+
+#define NWIPE_PRNG_INIT_SIGNATURE void **state, nwipe_entropy_t *seed
+#define NWIPE_PRNG_READ_SIGNATURE void **state, void *buffer, size_t count
+
+/* Function pointers for PRNG actions. */
+typedef int ( *nwipe_prng_init_t )( NWIPE_PRNG_INIT_SIGNATURE );
+typedef int ( *nwipe_prng_read_t )( NWIPE_PRNG_READ_SIGNATURE );
+
+/* The generic PRNG definition. */
+typedef struct
+{
+    const char* label;  // The name of the pseudo random number generator.
+    nwipe_prng_init_t init;  // Inialize the prng state with the seed.
+    nwipe_prng_read_t read;  // Read data from the prng.
+} nwipe_prng_t;
+
+/* Mersenne Twister prototypes. */
+int nwipe_twister_init( NWIPE_PRNG_INIT_SIGNATURE );
+int nwipe_twister_read( NWIPE_PRNG_READ_SIGNATURE );
+
+/* ISAAC prototypes. */
+int nwipe_isaac_init( NWIPE_PRNG_INIT_SIGNATURE );
+int nwipe_isaac_read( NWIPE_PRNG_READ_SIGNATURE );
+int nwipe_isaac64_init( NWIPE_PRNG_INIT_SIGNATURE );
+int nwipe_isaac64_read( NWIPE_PRNG_READ_SIGNATURE );
+
+/* Size of the twister is not derived from the architecture, but it is strictly 4 bytes */
+#define SIZE_OF_TWISTER 4
+
+/* Size of the isaac/isaac64 is not derived from the architecture, but it is strictly 4 or 8 bytes */
+#define SIZE_OF_ISAAC 4
+#define SIZE_OF_ISAAC64 8
+
+#endif /* PRNG_H_ */
diff --git a/src/temperature.c b/src/temperature.c
new file mode 100644
index 0000000..d6511c3
--- /dev/null
+++ b/src/temperature.c
@@ -0,0 +1,270 @@
+/*
+ *  temperature.c: functions that populate the drive temperature variables
+ *  in each drives context structure.
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+//#define _LARGEFILE64_SOURCE
+//#define _FILE_OFFSET_BITS 64
+#define _BSD_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <dirent.h>
+
+#include "nwipe.h"
+#include "context.h"
+#include "method.h"
+#include "device.h"
+#include "prng.h"
+#include "options.h"
+#include "device.h"
+#include "logging.h"
+#include "temperature.h"
+
+int nwipe_init_temperature( nwipe_context_t* c )
+{
+    /* This function is called after each nwipe_context_t has been created.
+     * It initialises the temperature variables in each context and then
+     * constructs a path that is placed in the context that points to the
+     * appropriate /sys/class/hwmon/hwmonX directory that corresponds with
+     * the particular drive represented in the context structure.
+     */
+    DIR* dir;
+    DIR* dir2;
+    const char dirpath[] = "/sys/class/hwmon";
+    char dirpath_tmp[256];
+    char dirpath_tmp2[256];
+    char dirpath_hwmonX[256];
+    char device[256];
+    char device_context_name[256];
+    // const char dirpath[] = "/home/nick/mouse/hwmon1";
+    struct dirent* dp;
+    struct dirent* dp2;
+
+    /* Why Initialise with 1000000? Because the GUI needs to know whether data
+     * has been obtained so it can display appropriate information when a
+     * device is unable to provide temperature data */
+
+    c->temp1_crit = 1000000;
+    c->temp1_highest = 1000000;
+    c->temp1_input = 1000000;
+    c->temp1_lcrit = 1000000;
+    c->temp1_lowest = 1000000;
+    c->temp1_max = 1000000;
+    c->temp1_min = 1000000;
+    c->temp1_monitored_wipe_max = 1000000;
+    c->temp1_monitored_wipe_min = 1000000;
+    c->temp1_monitored_wipe_avg = 1000000;
+    c->temp1_flash_rate = 2;
+    c->temp1_flash_rate_counter = 0;
+    c->temp1_path[0] = 0;
+    c->temp1_time = 0;
+
+    /* Each hwmonX directory is processed in turn and once a hwmonX directory has been
+     * found that is a block device and the block device name matches the drive
+     * name in the current context then the path to ../hwmonX is constructed and written
+     * to the drive context structure '* c'. This path is used in the nwipe_update_temperature
+     * function to retrieve temperature data and store it in the device context
+     */
+
+    if( ( dir = opendir( dirpath ) ) != NULL )
+    {
+        /* Process each hwmonX sub directory  in turn */
+        while( ( dp = readdir( dir ) ) != NULL )
+        {
+            /* Does the directory start with 'hwmon' */
+            if( strstr( dp->d_name, "hwmon" ) != NULL )
+            {
+                if( nwipe_options.verbose )
+                {
+                    /* print a empty line to separate the different hwmon sensors */
+                    nwipe_log( NWIPE_LOG_DEBUG, "hwmon:" );
+                }
+                strcpy( dirpath_tmp, dirpath );
+                strcat( dirpath_tmp, "/" );
+                strcat( dirpath_tmp, dp->d_name );
+                strcpy( dirpath_hwmonX, dirpath_tmp );
+                strcat( dirpath_tmp, "/device/block" );
+
+                /* Depending on the class of block device, the device name may
+                 * appear in different sub-directories. So we try to open each
+                 * directory that are known to contain block devices. These are
+                 * /sys/class/hwmon/hwmonX/device/block
+                 * /sys/class/hwmon/hwmonX/device/nvme/nvme0
+                 * /sys/class/hwmon/hwmonX/device/
+                 */
+
+                if( ( dir2 = opendir( dirpath_tmp ) ) == NULL )
+                {
+                    if( nwipe_options.verbose )
+                    {
+                        nwipe_log( NWIPE_LOG_DEBUG, "hwmon: %s doesn't exist, trying next path", dirpath_tmp );
+                    }
+                    strcpy( dirpath_tmp2, dirpath_hwmonX );
+                    strcat( dirpath_tmp2, "/device/nvme/nvme0" );
+                    strcpy( dirpath_tmp, dirpath_tmp2 );
+
+                    if( ( dir2 = opendir( dirpath_tmp ) ) == NULL )
+                    {
+                        if( nwipe_options.verbose )
+                        {
+                            nwipe_log( NWIPE_LOG_DEBUG, "hwmon: %s doesn't exist, trying next path", dirpath_tmp );
+                        }
+
+                        strcpy( dirpath_tmp2, dirpath_hwmonX );
+                        strcat( dirpath_tmp2, "/device" );
+                        strcpy( dirpath_tmp, dirpath_tmp2 );
+
+                        if( ( dir2 = opendir( dirpath_tmp ) ) == NULL )
+                        {
+                            if( nwipe_options.verbose )
+                            {
+                                nwipe_log(
+                                    NWIPE_LOG_DEBUG, "hwmon: %s doesn't exist, no more paths to try", dirpath_tmp );
+                            }
+                            continue;
+                        }
+                    }
+                }
+
+                if( dir2 != NULL )
+                {
+                    if( nwipe_options.verbose )
+                    {
+                        nwipe_log( NWIPE_LOG_DEBUG, "hwmon: Found %s", dirpath_tmp );
+                    }
+
+                    /* Read the device name */
+                    while( ( dp2 = readdir( dir2 ) ) != NULL )
+                    {
+                        if( nwipe_options.verbose )
+                        {
+                            nwipe_log( NWIPE_LOG_DEBUG, "hwmon: dirpath_tmp=%s/%s", dirpath_tmp, &dp2->d_name[0] );
+                        }
+
+                        /* Skip the '.' and '..' directories */
+                        if( dp2->d_name[0] == '.' )
+                        {
+                            continue;
+                        }
+                        strcpy( device, dp2->d_name );
+
+                        /* Create a copy of the device name from the context but strip the path from it, right justify
+                         * device name, prefix with spaces so length is 8. */
+                        nwipe_strip_path( device_context_name, c->device_name );
+
+                        /* Remove leading/training whitespace from a string and left justify result */
+                        trim( device_context_name );
+
+                        /* Does the hwmon device match the device for this drive context */
+                        if( strcmp( device, device_context_name ) != 0 )
+                        {
+                            /* No, so try next hwmon device */
+                            continue;
+                        }
+                        else
+                        {
+                            /* Match ! This hwmon device matches this context, so write the hwmonX path to the context
+                             */
+                            nwipe_log( NWIPE_LOG_NOTICE, "hwmon: %s has temperature monitoring", device, dirpath_tmp );
+                            if( nwipe_options.verbose )
+                            {
+                                nwipe_log( NWIPE_LOG_DEBUG, "hwmon: %s found in %s", device, dirpath_tmp );
+                            }
+                            /* Copy the hwmon path to the drive context structure */
+                            strcpy( c->temp1_path, dirpath_hwmonX );
+                        }
+                    }
+                    closedir( dir2 );
+                }
+            }
+        }
+        closedir( dir );
+    }
+
+    return 0;
+}
+
+void nwipe_update_temperature( nwipe_context_t* c )
+{
+    /* For the given drive context obtain the path to it's hwmon temperature settings
+     * and read then write the temperature values back to the context. A numeric ascii to integer conversion is
+     * performed. The temperaures should be updated no more frequently than every 60 seconds
+     */
+
+    char temperature_label[NUMBER_OF_FILES][20] = {
+        "temp1_crit", "temp1_highest", "temp1_input", "temp1_lcrit", "temp1_lowest", "temp1_max", "temp1_min" };
+    int* temperature_pcontext[NUMBER_OF_FILES] = {
+
+        &( c->temp1_crit ),
+        &( c->temp1_highest ),
+        &( c->temp1_input ),
+        &( c->temp1_lcrit ),
+        &( c->temp1_lowest ),
+        &( c->temp1_max ),
+        &( c->temp1_min ) };
+
+    char path[256];
+    char temperature[256];
+    FILE* fptr;
+    int idx;
+    int result;
+
+    for( idx = 0; idx < NUMBER_OF_FILES; idx++ )
+    {
+        /* Construct the full path including filename */
+        strcpy( path, c->temp1_path );
+        strcat( path, "/" );
+        strcat( path, &( temperature_label[idx][0] ) );
+
+        /* Open the file */
+        if( ( fptr = fopen( path, "r" ) ) != NULL )
+        {
+            /* Acquire data until we reach a newline */
+            result = fscanf( fptr, "%[^\n]", temperature );
+
+            /* Convert numeric ascii to binary integer */
+            *( temperature_pcontext[idx] ) = atoi( temperature );
+
+            /* Divide by 1000 to get degrees celcius */
+            *( temperature_pcontext[idx] ) = *( temperature_pcontext[idx] ) / 1000;
+
+            if( nwipe_options.verbose )
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "hwmon: %s %dC", path, *( temperature_pcontext[idx] ) );
+            }
+
+            fclose( fptr );
+        }
+        else
+        {
+            if( nwipe_options.verbose )
+            {
+                nwipe_log( NWIPE_LOG_NOTICE, "hwmon: Unable to  open %s", path );
+            }
+        }
+    }
+
+    /* Update the time stamp that records when we checked the temperature,
+     * this is used by the GUI to check temperatures periodically, typically
+     * every 60 seconds */
+    c->temp1_time = time( NULL );
+
+    return;
+}
diff --git a/src/temperature.h b/src/temperature.h
new file mode 100644
index 0000000..d538822
--- /dev/null
+++ b/src/temperature.h
@@ -0,0 +1,30 @@
+/*.
+ *  temperature.h: The header file for disk drive temperature sensing
+ *
+ *  This program is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free Software
+ *  Foundation, version 2.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef TEMPERATURE_H_
+#define TEMPERATURE_H_
+
+#include <sys/types.h>
+#include "context.h"
+
+int nwipe_init_temperature( nwipe_context_t* );
+void nwipe_update_temperature( nwipe_context_t* );
+
+#define NUMBER_OF_FILES 7
+
+#endif /* TEMPERATURE_H_ */
diff --git a/src/version.c b/src/version.c
new file mode 100644
index 0000000..8abd0af
--- /dev/null
+++ b/src/version.c
@@ -0,0 +1,17 @@
+/**
+ * version_string and program_name are used by siege
+ * and configure; author_name and email_address are
+ * used by configure to dynamically assign those values
+ * to documentation files.
+ */
+const char* version_string = "0.33";
+const char* program_name = "nwipe";
+const char* author_name = "Martijn van Brummelen";
+const char* email_address = "git@brumit.nl";
+const char* years = "2022";
+const char* copyright = "Copyright Darik Horn <dajhorn-dban@vanadac.com>\n\
+Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>\n\
+This is free software; see the source for copying conditions.\n\
+There is NO warranty; not even for MERCHANTABILITY or FITNESS\n\
+FOR A PARTICULAR PURPOSE.\n";
+const char* banner = "nwipe 0.33";
diff --git a/src/version.h b/src/version.h
new file mode 100644
index 0000000..b1214b2
--- /dev/null
+++ b/src/version.h
@@ -0,0 +1,11 @@
+#ifndef __VERSION_H
+#define __VERSION_H
+
+extern char* version_string;
+extern char* program_name;
+extern char* author_name;
+extern char* email_address;
+extern char* copyright;
+extern char* banner;
+
+#endif /*__VERSION_H*/