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-rw-r--r--src/diffviewer/Makefile.am8
-rw-r--r--src/diffviewer/Makefile.in740
-rw-r--r--src/diffviewer/internal.h153
-rw-r--r--src/diffviewer/search.c288
-rw-r--r--src/diffviewer/ydiff.c3648
-rw-r--r--src/diffviewer/ydiff.h16
6 files changed, 4853 insertions, 0 deletions
diff --git a/src/diffviewer/Makefile.am b/src/diffviewer/Makefile.am
new file mode 100644
index 0000000..7986645
--- /dev/null
+++ b/src/diffviewer/Makefile.am
@@ -0,0 +1,8 @@
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+
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+ internal.h \
+ search.c \
+ ydiff.c ydiff.h
+
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diff --git a/src/diffviewer/Makefile.in b/src/diffviewer/Makefile.in
new file mode 100644
index 0000000..cb5729e
--- /dev/null
+++ b/src/diffviewer/Makefile.in
@@ -0,0 +1,740 @@
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/diffviewer/internal.h b/src/diffviewer/internal.h
new file mode 100644
index 0000000..728d4b5
--- /dev/null
+++ b/src/diffviewer/internal.h
@@ -0,0 +1,153 @@
+#ifndef MC__DIFFVIEW_INTERNAL_H
+#define MC__DIFFVIEW_INTERNAL_H
+
+#include "lib/global.h"
+#include "lib/mcconfig.h"
+#include "lib/search.h"
+#include "lib/tty/color.h"
+#include "lib/widget.h"
+
+/*** typedefs(not structures) and defined constants **********************************************/
+
+typedef int (*DFUNC) (void *ctx, int ch, int line, off_t off, size_t sz, const char *str);
+typedef int PAIR[2];
+
+#define error_dialog(h, s) query_dialog(h, s, D_ERROR, 1, _("&Dismiss"))
+
+/*** enums ***************************************************************************************/
+
+typedef enum
+{
+ DATA_SRC_MEM = 0,
+ DATA_SRC_TMP = 1,
+ DATA_SRC_ORG = 2
+} DSRC;
+
+typedef enum
+{
+ DIFF_LEFT = 0,
+ DIFF_RIGHT = 1,
+ DIFF_COUNT = 2
+} diff_place_t;
+
+typedef enum
+{
+ DIFF_NONE = 0,
+ DIFF_ADD = 1,
+ DIFF_DEL = 2,
+ DIFF_CHG = 3
+} DiffState;
+
+/*** structures declarations (and typedefs of structures)*****************************************/
+
+typedef struct
+{
+ int fd;
+ int pos;
+ int len;
+ char *buf;
+ int flags;
+ void *data;
+} FBUF;
+
+typedef struct
+{
+ int a[2][2];
+ int cmd;
+} DIFFCMD;
+
+
+typedef struct
+{
+ int off;
+ int len;
+} BRACKET[DIFF_COUNT];
+
+typedef struct
+{
+ int ch;
+ int line;
+ union
+ {
+ off_t off;
+ size_t len;
+ } u;
+ void *p;
+} DIFFLN;
+
+typedef struct
+{
+ FBUF *f;
+ GArray *a;
+ DSRC dsrc;
+} PRINTER_CTX;
+
+typedef struct WDiff
+{
+ Widget widget;
+
+ const char *args; /* Args passed to diff */
+ const char *file[DIFF_COUNT]; /* filenames */
+ char *label[DIFF_COUNT];
+ FBUF *f[DIFF_COUNT];
+ const char *backup_sufix;
+ gboolean merged[DIFF_COUNT];
+ GArray *a[DIFF_COUNT];
+ GPtrArray *hdiff;
+ int ndiff; /* number of hunks */
+ DSRC dsrc; /* data source: memory or temporary file */
+
+ gboolean view_quit; /* Quit flag */
+
+ int height;
+ int half1;
+ int half2;
+ int width1;
+ int width2;
+ int bias;
+ gboolean new_frame;
+ int skip_rows;
+ int skip_cols;
+ int display_symbols;
+ int display_numbers;
+ gboolean show_cr;
+ int tab_size;
+ diff_place_t ord;
+ gboolean full;
+
+#ifdef HAVE_CHARSET
+ gboolean utf8;
+ /* converter for translation of text */
+ GIConv converter;
+#endif /* HAVE_CHARSET */
+
+ struct
+ {
+ int quality;
+ gboolean strip_trailing_cr;
+ gboolean ignore_tab_expansion;
+ gboolean ignore_space_change;
+ gboolean ignore_all_space;
+ gboolean ignore_case;
+ } opt;
+
+ /* Search variables */
+ struct
+ {
+ mc_search_t *handle;
+ gchar *last_string;
+
+ ssize_t last_found_line;
+ ssize_t last_accessed_num_line;
+ } search;
+} WDiff;
+
+/*** global variables defined in .c file *********************************************************/
+
+/*** declarations of public functions ************************************************************/
+
+/* search.c */
+void dview_search_cmd (WDiff * dview);
+void dview_continue_search_cmd (WDiff * dview);
+
+#endif /* MC__DIFFVIEW_INTERNAL_H */
diff --git a/src/diffviewer/search.c b/src/diffviewer/search.c
new file mode 100644
index 0000000..77d09cd
--- /dev/null
+++ b/src/diffviewer/search.c
@@ -0,0 +1,288 @@
+/*
+ Search functions for diffviewer.
+
+ Copyright (C) 2010-2023
+ Free Software Foundation, Inc.
+
+ Written by:
+ Slava Zanko <slavazanko@gmail.com>, 2010.
+ Andrew Borodin <aborodin@vmail.ru>, 2012-2022
+
+ This file is part of the Midnight Commander.
+
+ The Midnight Commander 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, either version 3 of the License,
+ or (at your option) any later version.
+
+ The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include "lib/global.h"
+#include "lib/strutil.h"
+#include "lib/tty/key.h"
+#include "lib/widget.h"
+#ifdef HAVE_CHARSET
+#include "lib/charsets.h"
+#endif
+
+#include "src/history.h"
+
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+typedef struct mcdiffview_search_options_struct
+{
+ mc_search_type_t type;
+ gboolean case_sens;
+ gboolean backwards;
+ gboolean whole_words;
+ gboolean all_codepages;
+} mcdiffview_search_options_t;
+
+/*** forward declarations (file scope functions) *************************************************/
+
+/*** file scope variables ************************************************************************/
+
+static mcdiffview_search_options_t mcdiffview_search_options = {
+ .type = MC_SEARCH_T_NORMAL,
+ .case_sens = FALSE,
+ .backwards = FALSE,
+ .whole_words = FALSE,
+ .all_codepages = FALSE,
+};
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static gboolean
+mcdiffview_dialog_search (WDiff * dview)
+{
+ char *exp = NULL;
+ int qd_result;
+ size_t num_of_types = 0;
+ gchar **list_of_types;
+
+ list_of_types = mc_search_get_types_strings_array (&num_of_types);
+
+ {
+ quick_widget_t quick_widgets[] = {
+ /* *INDENT-OFF* */
+ QUICK_LABELED_INPUT (N_("Enter search string:"), input_label_above, INPUT_LAST_TEXT,
+ MC_HISTORY_SHARED_SEARCH, &exp, NULL, FALSE, FALSE, INPUT_COMPLETE_NONE),
+ QUICK_SEPARATOR (TRUE),
+ QUICK_START_COLUMNS,
+ QUICK_RADIO (num_of_types, (const char **) list_of_types,
+ (int *) &mcdiffview_search_options.type, NULL),
+ QUICK_NEXT_COLUMN,
+ QUICK_CHECKBOX (N_("Cas&e sensitive"), &mcdiffview_search_options.case_sens, NULL),
+ QUICK_CHECKBOX (N_("&Backwards"), &mcdiffview_search_options.backwards, NULL),
+ QUICK_CHECKBOX (N_("&Whole words"), &mcdiffview_search_options.whole_words, NULL),
+#ifdef HAVE_CHARSET
+ QUICK_CHECKBOX (N_("&All charsets"), &mcdiffview_search_options.all_codepages, NULL),
+#endif
+ QUICK_STOP_COLUMNS,
+ QUICK_BUTTONS_OK_CANCEL,
+ QUICK_END
+ /* *INDENT-ON* */
+ };
+
+ WRect r = { -1, -1, 0, 58 };
+
+ quick_dialog_t qdlg = {
+ r, N_("Search"), "[Input Line Keys]",
+ quick_widgets, NULL, NULL
+ };
+
+ qd_result = quick_dialog (&qdlg);
+ }
+
+ g_strfreev (list_of_types);
+
+ if (qd_result == B_CANCEL || exp[0] == '\0')
+ {
+ g_free (exp);
+ return FALSE;
+ }
+
+#ifdef HAVE_CHARSET
+ {
+ GString *tmp;
+
+ tmp = str_convert_to_input (exp);
+ g_free (exp);
+ if (tmp != NULL)
+ exp = g_string_free (tmp, FALSE);
+ else
+ exp = g_strdup ("");
+ }
+#endif
+
+ g_free (dview->search.last_string);
+ dview->search.last_string = exp;
+
+ return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static gboolean
+mcdiffview_do_search_backward (WDiff * dview)
+{
+ ssize_t ind;
+
+ if (dview->search.last_accessed_num_line < 0)
+ {
+ dview->search.last_accessed_num_line = -1;
+ return FALSE;
+ }
+
+ if ((size_t) dview->search.last_accessed_num_line >= dview->a[dview->ord]->len)
+ dview->search.last_accessed_num_line = (ssize_t) dview->a[dview->ord]->len;
+
+ for (ind = --dview->search.last_accessed_num_line; ind >= 0; ind--)
+ {
+ DIFFLN *p;
+
+ p = (DIFFLN *) & g_array_index (dview->a[dview->ord], DIFFLN, (size_t) ind);
+ if (p->u.len == 0)
+ continue;
+
+ if (mc_search_run (dview->search.handle, p->p, 0, p->u.len, NULL))
+ {
+ dview->skip_rows = dview->search.last_found_line =
+ dview->search.last_accessed_num_line = ind;
+ return TRUE;
+ }
+ }
+ return FALSE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+
+static gboolean
+mcdiffview_do_search_forward (WDiff * dview)
+{
+ size_t ind;
+
+ if (dview->search.last_accessed_num_line < 0)
+ dview->search.last_accessed_num_line = -1;
+ else if ((size_t) dview->search.last_accessed_num_line >= dview->a[dview->ord]->len)
+ {
+ dview->search.last_accessed_num_line = (ssize_t) dview->a[dview->ord]->len;
+ return FALSE;
+ }
+
+ for (ind = (size_t)++ dview->search.last_accessed_num_line; ind < dview->a[dview->ord]->len;
+ ind++)
+ {
+ DIFFLN *p;
+
+ p = (DIFFLN *) & g_array_index (dview->a[dview->ord], DIFFLN, ind);
+ if (p->u.len == 0)
+ continue;
+
+ if (mc_search_run (dview->search.handle, p->p, 0, p->u.len, NULL))
+ {
+ dview->skip_rows = dview->search.last_found_line =
+ dview->search.last_accessed_num_line = (ssize_t) ind;
+ return TRUE;
+ }
+ }
+ return FALSE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+mcdiffview_do_search (WDiff * dview)
+{
+ gboolean present_result = FALSE;
+
+ tty_enable_interrupt_key ();
+
+ if (mcdiffview_search_options.backwards)
+ {
+ present_result = mcdiffview_do_search_backward (dview);
+ }
+ else
+ {
+ present_result = mcdiffview_do_search_forward (dview);
+ }
+
+ tty_disable_interrupt_key ();
+
+ if (!present_result)
+ {
+ dview->search.last_found_line = -1;
+ query_dialog (_("Search"), _(STR_E_NOTFOUND), D_NORMAL, 1, _("&Dismiss"));
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dview_search_cmd (WDiff * dview)
+{
+ if (dview->dsrc != DATA_SRC_MEM)
+ {
+ error_dialog (_("Search"), _("Search is disabled"));
+ return;
+ }
+
+ if (!mcdiffview_dialog_search (dview))
+ return;
+
+ mc_search_free (dview->search.handle);
+#ifdef HAVE_CHARSET
+ dview->search.handle = mc_search_new (dview->search.last_string, cp_source);
+#else
+ dview->search.handle = mc_search_new (dview->search.last_string, NULL);
+#endif
+
+ if (dview->search.handle == NULL)
+ return;
+
+ dview->search.handle->search_type = mcdiffview_search_options.type;
+#ifdef HAVE_CHARSET
+ dview->search.handle->is_all_charsets = mcdiffview_search_options.all_codepages;
+#endif
+ dview->search.handle->is_case_sensitive = mcdiffview_search_options.case_sens;
+ dview->search.handle->whole_words = mcdiffview_search_options.whole_words;
+
+ mcdiffview_do_search (dview);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+dview_continue_search_cmd (WDiff * dview)
+{
+ if (dview->dsrc != DATA_SRC_MEM)
+ error_dialog (_("Search"), _("Search is disabled"));
+ else if (dview->search.handle == NULL)
+ dview_search_cmd (dview);
+ else
+ mcdiffview_do_search (dview);
+}
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/diffviewer/ydiff.c b/src/diffviewer/ydiff.c
new file mode 100644
index 0000000..3afb8af
--- /dev/null
+++ b/src/diffviewer/ydiff.c
@@ -0,0 +1,3648 @@
+/*
+ File difference viewer
+
+ Copyright (C) 2007-2023
+ Free Software Foundation, Inc.
+
+ Written by:
+ Daniel Borca <dborca@yahoo.com>, 2007
+ Slava Zanko <slavazanko@gmail.com>, 2010, 2013
+ Andrew Borodin <aborodin@vmail.ru>, 2010-2022
+ Ilia Maslakov <il.smind@gmail.com>, 2010
+
+ This file is part of the Midnight Commander.
+
+ The Midnight Commander 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, either version 3 of the License,
+ or (at your option) any later version.
+
+ The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <config.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stddef.h> /* ptrdiff_t */
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "lib/global.h"
+#include "lib/tty/tty.h"
+#include "lib/tty/color.h"
+#include "lib/tty/key.h"
+#include "lib/skin.h" /* EDITOR_NORMAL_COLOR */
+#include "lib/vfs/vfs.h" /* mc_opendir, mc_readdir, mc_closedir, */
+#include "lib/util.h"
+#include "lib/widget.h"
+#include "lib/strutil.h"
+#include "lib/strescape.h" /* strutils_glob_escape() */
+#ifdef HAVE_CHARSET
+#include "lib/charsets.h"
+#endif
+#include "lib/event.h" /* mc_event_raise() */
+
+#include "src/filemanager/cmd.h" /* edit_file_at_line() */
+#include "src/filemanager/panel.h"
+#include "src/filemanager/layout.h" /* Needed for get_current_index and get_other_panel */
+
+#include "src/execute.h" /* toggle_subshell() */
+#include "src/keymap.h"
+#include "src/setup.h"
+#include "src/history.h"
+#ifdef HAVE_CHARSET
+#include "src/selcodepage.h"
+#endif
+
+#include "ydiff.h"
+#include "internal.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+#define g_array_foreach(a, TP, cbf) \
+do { \
+ size_t g_array_foreach_i;\
+ \
+ for (g_array_foreach_i = 0; g_array_foreach_i < a->len; g_array_foreach_i++) \
+ { \
+ TP *g_array_foreach_var; \
+ \
+ g_array_foreach_var = &g_array_index (a, TP, g_array_foreach_i); \
+ (*cbf) (g_array_foreach_var); \
+ } \
+} while (0)
+
+#define FILE_READ_BUF 4096
+#define FILE_FLAG_TEMP (1 << 0)
+
+#define ADD_CH '+'
+#define DEL_CH '-'
+#define CHG_CH '*'
+#define EQU_CH ' '
+
+#define HDIFF_ENABLE 1
+#define HDIFF_MINCTX 5
+#define HDIFF_DEPTH 10
+
+#define FILE_DIRTY(fs) \
+do \
+{ \
+ (fs)->pos = 0; \
+ (fs)->len = 0; \
+} \
+while (0)
+
+/*** file scope type declarations ****************************************************************/
+
+typedef enum
+{
+ FROM_LEFT_TO_RIGHT,
+ FROM_RIGHT_TO_LEFT
+} action_direction_t;
+
+/*** forward declarations (file scope functions) *************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static inline int
+TAB_SKIP (int ts, int pos)
+{
+ if (ts > 0 && ts < 9)
+ return ts - pos % ts;
+ else
+ return 8 - pos % 8;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static gboolean
+rewrite_backup_content (const vfs_path_t * from_file_name_vpath, const char *to_file_name)
+{
+ FILE *backup_fd;
+ char *contents;
+ gsize length;
+ const char *from_file_name;
+
+ from_file_name = vfs_path_get_last_path_str (from_file_name_vpath);
+ if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
+ return FALSE;
+
+ backup_fd = fopen (to_file_name, "w");
+ if (backup_fd == NULL)
+ {
+ g_free (contents);
+ return FALSE;
+ }
+
+ length = fwrite ((const void *) contents, length, 1, backup_fd);
+
+ fflush (backup_fd);
+ fclose (backup_fd);
+ g_free (contents);
+ return TRUE;
+}
+
+/* buffered I/O ************************************************************* */
+
+/**
+ * Try to open a temporary file.
+ * @note the name is not altered if this function fails
+ *
+ * @param[out] name address of a pointer to store the temporary name
+ * @return file descriptor on success, negative on error
+ */
+
+static int
+open_temp (void **name)
+{
+ int fd;
+ vfs_path_t *diff_file_name = NULL;
+
+ fd = mc_mkstemps (&diff_file_name, "mcdiff", NULL);
+ if (fd == -1)
+ {
+ message (D_ERROR, MSG_ERROR,
+ _("Cannot create temporary diff file\n%s"), unix_error_string (errno));
+ return -1;
+ }
+
+ *name = vfs_path_free (diff_file_name, FALSE);
+ return fd;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Allocate file structure and associate file descriptor to it.
+ *
+ * @param fd file descriptor
+ * @return file structure
+ */
+
+static FBUF *
+f_dopen (int fd)
+{
+ FBUF *fs;
+
+ if (fd < 0)
+ return NULL;
+
+ fs = g_try_malloc (sizeof (FBUF));
+ if (fs == NULL)
+ return NULL;
+
+ fs->buf = g_try_malloc (FILE_READ_BUF);
+ if (fs->buf == NULL)
+ {
+ g_free (fs);
+ return NULL;
+ }
+
+ fs->fd = fd;
+ FILE_DIRTY (fs);
+ fs->flags = 0;
+ fs->data = NULL;
+
+ return fs;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Free file structure without closing the file.
+ *
+ * @param fs file structure
+ * @return 0 on success, non-zero on error
+ */
+
+static int
+f_free (FBUF * fs)
+{
+ int rv = 0;
+
+ if (fs->flags & FILE_FLAG_TEMP)
+ {
+ rv = unlink (fs->data);
+ g_free (fs->data);
+ }
+ g_free (fs->buf);
+ g_free (fs);
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Open a binary temporary file in R/W mode.
+ * @note the file will be deleted when closed
+ *
+ * @return file structure
+ */
+static FBUF *
+f_temp (void)
+{
+ int fd;
+ FBUF *fs;
+
+ fs = f_dopen (0);
+ if (fs == NULL)
+ return NULL;
+
+ fd = open_temp (&fs->data);
+ if (fd < 0)
+ {
+ f_free (fs);
+ return NULL;
+ }
+
+ fs->fd = fd;
+ fs->flags = FILE_FLAG_TEMP;
+ return fs;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Open a binary file in specified mode.
+ *
+ * @param filename file name
+ * @param flags open mode, a combination of O_RDONLY, O_WRONLY, O_RDWR
+ *
+ * @return file structure
+ */
+
+static FBUF *
+f_open (const char *filename, int flags)
+{
+ int fd;
+ FBUF *fs;
+
+ fs = f_dopen (0);
+ if (fs == NULL)
+ return NULL;
+
+ fd = open (filename, flags);
+ if (fd < 0)
+ {
+ f_free (fs);
+ return NULL;
+ }
+
+ fs->fd = fd;
+ return fs;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Read a line of bytes from file until newline or EOF.
+ * @note does not stop on null-byte
+ * @note buf will not be null-terminated
+ *
+ * @param buf destination buffer
+ * @param size size of buffer
+ * @param fs file structure
+ *
+ * @return number of bytes read
+ */
+
+static size_t
+f_gets (char *buf, size_t size, FBUF * fs)
+{
+ size_t j = 0;
+
+ do
+ {
+ int i;
+ int stop = 0;
+
+ for (i = fs->pos; j < size && i < fs->len && !stop; i++, j++)
+ {
+ buf[j] = fs->buf[i];
+ if (buf[j] == '\n')
+ stop = 1;
+ }
+ fs->pos = i;
+
+ if (j == size || stop)
+ break;
+
+ fs->pos = 0;
+ fs->len = read (fs->fd, fs->buf, FILE_READ_BUF);
+ }
+ while (fs->len > 0);
+
+ return j;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Seek into file.
+ * @note avoids thrashing read cache when possible
+ *
+ * @param fs file structure
+ * @param off offset
+ * @param whence seek directive: SEEK_SET, SEEK_CUR or SEEK_END
+ *
+ * @return position in file, starting from beginning
+ */
+
+static off_t
+f_seek (FBUF * fs, off_t off, int whence)
+{
+ off_t rv;
+
+ if (fs->len && whence != SEEK_END)
+ {
+ rv = lseek (fs->fd, 0, SEEK_CUR);
+ if (rv != -1)
+ {
+ if (whence == SEEK_CUR)
+ {
+ whence = SEEK_SET;
+ off += rv - fs->len + fs->pos;
+ }
+ if (off - rv >= -fs->len && off - rv <= 0)
+ {
+ fs->pos = fs->len + off - rv;
+ return off;
+ }
+ }
+ }
+
+ rv = lseek (fs->fd, off, whence);
+ if (rv != -1)
+ FILE_DIRTY (fs);
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Seek to the beginning of file, thrashing read cache.
+ *
+ * @param fs file structure
+ *
+ * @return 0 if success, non-zero on error
+ */
+
+static off_t
+f_reset (FBUF * fs)
+{
+ off_t rv;
+
+ rv = lseek (fs->fd, 0, SEEK_SET);
+ if (rv != -1)
+ FILE_DIRTY (fs);
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Write bytes to file.
+ * @note thrashes read cache
+ *
+ * @param fs file structure
+ * @param buf source buffer
+ * @param size size of buffer
+ *
+ * @return number of written bytes, -1 on error
+ */
+
+static ssize_t
+f_write (FBUF * fs, const char *buf, size_t size)
+{
+ ssize_t rv;
+
+ rv = write (fs->fd, buf, size);
+ if (rv >= 0)
+ FILE_DIRTY (fs);
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Truncate file to the current position.
+ * @note thrashes read cache
+ *
+ * @param fs file structure
+ *
+ * @return current file size on success, negative on error
+ */
+
+static off_t
+f_trunc (FBUF * fs)
+{
+ off_t off;
+
+ off = lseek (fs->fd, 0, SEEK_CUR);
+ if (off != -1)
+ {
+ int rv;
+
+ rv = ftruncate (fs->fd, off);
+ if (rv != 0)
+ off = -1;
+ else
+ FILE_DIRTY (fs);
+ }
+ return off;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Close file.
+ * @note if this is temporary file, it is deleted
+ *
+ * @param fs file structure
+ * @return 0 on success, non-zero on error
+ */
+
+static int
+f_close (FBUF * fs)
+{
+ int rv = -1;
+
+ if (fs != NULL)
+ {
+ rv = close (fs->fd);
+ f_free (fs);
+ }
+
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Create pipe stream to process.
+ *
+ * @param cmd shell command line
+ * @param flags open mode, either O_RDONLY or O_WRONLY
+ *
+ * @return file structure
+ */
+
+static FBUF *
+p_open (const char *cmd, int flags)
+{
+ FILE *f;
+ FBUF *fs;
+ const char *type = NULL;
+
+ if (flags == O_RDONLY)
+ type = "r";
+ else if (flags == O_WRONLY)
+ type = "w";
+
+ if (type == NULL)
+ return NULL;
+
+ fs = f_dopen (0);
+ if (fs == NULL)
+ return NULL;
+
+ f = popen (cmd, type);
+ if (f == NULL)
+ {
+ f_free (fs);
+ return NULL;
+ }
+
+ fs->fd = fileno (f);
+ fs->data = f;
+ return fs;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Close pipe stream.
+ *
+ * @param fs structure
+ * @return 0 on success, non-zero on error
+ */
+
+static int
+p_close (FBUF * fs)
+{
+ int rv = -1;
+
+ if (fs != NULL)
+ {
+ rv = pclose (fs->data);
+ f_free (fs);
+ }
+
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Get one char (byte) from string
+ *
+ * @param str ...
+ * @param ch ...
+ * @return TRUE on success, FALSE otherwise
+ */
+
+static gboolean
+dview_get_byte (const char *str, int *ch)
+{
+ if (str == NULL)
+ return FALSE;
+
+ *ch = (unsigned char) (*str);
+ return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+#ifdef HAVE_CHARSET
+/**
+ * Get utf multibyte char from string
+ *
+ * @param str ...
+ * @param ch ...
+ * @param ch_length ...
+ * @return TRUE on success, FALSE otherwise
+ */
+
+static gboolean
+dview_get_utf (const char *str, int *ch, int *ch_length)
+{
+ if (str == NULL)
+ return FALSE;
+
+ *ch = g_utf8_get_char_validated (str, -1);
+
+ if (*ch < 0)
+ {
+ *ch = (unsigned char) (*str);
+ *ch_length = 1;
+ }
+ else
+ {
+ char *next_ch;
+
+ /* Calculate UTF-8 char length */
+ next_ch = g_utf8_next_char (str);
+ *ch_length = next_ch - str;
+ }
+
+ return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+dview_str_utf8_offset_to_pos (const char *text, size_t length)
+{
+ ptrdiff_t result;
+
+ if (text == NULL || text[0] == '\0')
+ return length;
+
+ if (g_utf8_validate (text, -1, NULL))
+ result = g_utf8_offset_to_pointer (text, length) - text;
+ else
+ {
+ gunichar uni;
+ char *tmpbuf, *buffer;
+
+ buffer = tmpbuf = g_strdup (text);
+ while (tmpbuf[0] != '\0')
+ {
+ uni = g_utf8_get_char_validated (tmpbuf, -1);
+ if ((uni != (gunichar) (-1)) && (uni != (gunichar) (-2)))
+ tmpbuf = g_utf8_next_char (tmpbuf);
+ else
+ {
+ tmpbuf[0] = '.';
+ tmpbuf++;
+ }
+ }
+ result = g_utf8_offset_to_pointer (tmpbuf, length) - tmpbuf;
+ g_free (buffer);
+ }
+ return MAX (length, (size_t) result);
+}
+#endif /*HAVE_CHARSET */
+
+/* --------------------------------------------------------------------------------------------- */
+
+/* diff parse *************************************************************** */
+
+/**
+ * Read decimal number from string.
+ *
+ * @param[in,out] str string to parse
+ * @param[out] n extracted number
+ * @return 0 if success, otherwise non-zero
+ */
+
+static int
+scan_deci (const char **str, int *n)
+{
+ const char *p = *str;
+ char *q;
+
+ errno = 0;
+ *n = strtol (p, &q, 10);
+ if (errno != 0 || p == q)
+ return -1;
+ *str = q;
+ return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Parse line for diff statement.
+ *
+ * @param p string to parse
+ * @param ops list of diff statements
+ * @return 0 if success, otherwise non-zero
+ */
+
+static int
+scan_line (const char *p, GArray * ops)
+{
+ DIFFCMD op;
+
+ int f1, f2;
+ int t1, t2;
+ int cmd;
+ int range;
+
+ /* handle the following cases:
+ * NUMaNUM[,NUM]
+ * NUM[,NUM]cNUM[,NUM]
+ * NUM[,NUM]dNUM
+ * where NUM is a positive integer
+ */
+
+ if (scan_deci (&p, &f1) != 0 || f1 < 0)
+ return -1;
+
+ f2 = f1;
+ range = 0;
+ if (*p == ',')
+ {
+ p++;
+ if (scan_deci (&p, &f2) != 0 || f2 < f1)
+ return -1;
+
+ range = 1;
+ }
+
+ cmd = *p++;
+ if (cmd == 'a')
+ {
+ if (range != 0)
+ return -1;
+ }
+ else if (cmd != 'c' && cmd != 'd')
+ return -1;
+
+ if (scan_deci (&p, &t1) != 0 || t1 < 0)
+ return -1;
+
+ t2 = t1;
+ range = 0;
+ if (*p == ',')
+ {
+ p++;
+ if (scan_deci (&p, &t2) != 0 || t2 < t1)
+ return -1;
+
+ range = 1;
+ }
+
+ if (cmd == 'd' && range != 0)
+ return -1;
+
+ op.a[0][0] = f1;
+ op.a[0][1] = f2;
+ op.cmd = cmd;
+ op.a[1][0] = t1;
+ op.a[1][1] = t2;
+ g_array_append_val (ops, op);
+ return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Parse diff output and extract diff statements.
+ *
+ * @param f stream to read from
+ * @param ops list of diff statements to fill
+ * @return positive number indicating number of hunks, otherwise negative
+ */
+
+static int
+scan_diff (FBUF * f, GArray * ops)
+{
+ int sz;
+ char buf[BUFSIZ];
+
+ while ((sz = f_gets (buf, sizeof (buf) - 1, f)) != 0)
+ {
+ if (isdigit (buf[0]))
+ {
+ if (buf[sz - 1] != '\n')
+ return -1;
+
+ buf[sz] = '\0';
+ if (scan_line (buf, ops) != 0)
+ return -1;
+
+ continue;
+ }
+
+ while (buf[sz - 1] != '\n' && (sz = f_gets (buf, sizeof (buf), f)) != 0)
+ ;
+ }
+
+ return ops->len;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Invoke diff and extract diff statements.
+ *
+ * @param args extra arguments to be passed to diff
+ * @param extra more arguments to be passed to diff
+ * @param file1 first file to compare
+ * @param file2 second file to compare
+ * @param ops list of diff statements to fill
+ *
+ * @return positive number indicating number of hunks, otherwise negative
+ */
+
+static int
+dff_execute (const char *args, const char *extra, const char *file1, const char *file2,
+ GArray * ops)
+{
+ static const char *opt =
+ " --old-group-format='%df%(f=l?:,%dl)d%dE\n'"
+ " --new-group-format='%dea%dF%(F=L?:,%dL)\n'"
+ " --changed-group-format='%df%(f=l?:,%dl)c%dF%(F=L?:,%dL)\n'"
+ " --unchanged-group-format=''";
+
+ int rv;
+ FBUF *f;
+ char *cmd;
+ int code;
+ char *file1_esc, *file2_esc;
+
+ /* escape potential $ to avoid shell variable substitutions in popen() */
+ file1_esc = strutils_shell_escape (file1);
+ file2_esc = strutils_shell_escape (file2);
+ cmd = g_strdup_printf ("diff %s %s %s %s %s", args, extra, opt, file1_esc, file2_esc);
+ g_free (file1_esc);
+ g_free (file2_esc);
+
+ if (cmd == NULL)
+ return -1;
+
+ f = p_open (cmd, O_RDONLY);
+ g_free (cmd);
+
+ if (f == NULL)
+ return -1;
+
+ rv = scan_diff (f, ops);
+ code = p_close (f);
+
+ if (rv < 0 || code == -1 || !WIFEXITED (code) || WEXITSTATUS (code) == 2)
+ rv = -1;
+
+ return rv;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Reparse and display file according to diff statements.
+ *
+ * @param ord DIFF_LEFT if 1st file is displayed , DIFF_RIGHT if 2nd file is displayed.
+ * @param filename file name to display
+ * @param ops list of diff statements
+ * @param printer printf-like function to be used for displaying
+ * @param ctx printer context
+ *
+ * @return 0 if success, otherwise non-zero
+ */
+
+static int
+dff_reparse (diff_place_t ord, const char *filename, const GArray * ops, DFUNC printer, void *ctx)
+{
+ size_t i;
+ FBUF *f;
+ size_t sz;
+ char buf[BUFSIZ];
+ int line = 0;
+ off_t off = 0;
+ const DIFFCMD *op;
+ diff_place_t eff;
+ int add_cmd;
+ int del_cmd;
+
+ f = f_open (filename, O_RDONLY);
+ if (f == NULL)
+ return -1;
+
+ ord &= 1;
+ eff = ord;
+
+ add_cmd = 'a';
+ del_cmd = 'd';
+ if (ord != 0)
+ {
+ add_cmd = 'd';
+ del_cmd = 'a';
+ }
+#define F1 a[eff][0]
+#define F2 a[eff][1]
+#define T1 a[ ord^1 ][0]
+#define T2 a[ ord^1 ][1]
+ for (i = 0; i < ops->len; i++)
+ {
+ int n;
+
+ op = &g_array_index (ops, DIFFCMD, i);
+ n = op->F1 - (op->cmd != add_cmd);
+
+ while (line < n && (sz = f_gets (buf, sizeof (buf), f)) != 0)
+ {
+ line++;
+ printer (ctx, EQU_CH, line, off, sz, buf);
+ off += sz;
+ while (buf[sz - 1] != '\n')
+ {
+ sz = f_gets (buf, sizeof (buf), f);
+ if (sz == 0)
+ {
+ printer (ctx, 0, 0, 0, 1, "\n");
+ break;
+ }
+ printer (ctx, 0, 0, 0, sz, buf);
+ off += sz;
+ }
+ }
+
+ if (line != n)
+ goto err;
+
+ if (op->cmd == add_cmd)
+ {
+ n = op->T2 - op->T1 + 1;
+ while (n != 0)
+ {
+ printer (ctx, DEL_CH, 0, 0, 1, "\n");
+ n--;
+ }
+ }
+
+ if (op->cmd == del_cmd)
+ {
+ n = op->F2 - op->F1 + 1;
+ while (n != 0 && (sz = f_gets (buf, sizeof (buf), f)) != 0)
+ {
+ line++;
+ printer (ctx, ADD_CH, line, off, sz, buf);
+ off += sz;
+ while (buf[sz - 1] != '\n')
+ {
+ sz = f_gets (buf, sizeof (buf), f);
+ if (sz == 0)
+ {
+ printer (ctx, 0, 0, 0, 1, "\n");
+ break;
+ }
+ printer (ctx, 0, 0, 0, sz, buf);
+ off += sz;
+ }
+ n--;
+ }
+
+ if (n != 0)
+ goto err;
+ }
+
+ if (op->cmd == 'c')
+ {
+ n = op->F2 - op->F1 + 1;
+ while (n != 0 && (sz = f_gets (buf, sizeof (buf), f)) != 0)
+ {
+ line++;
+ printer (ctx, CHG_CH, line, off, sz, buf);
+ off += sz;
+ while (buf[sz - 1] != '\n')
+ {
+ sz = f_gets (buf, sizeof (buf), f);
+ if (sz == 0)
+ {
+ printer (ctx, 0, 0, 0, 1, "\n");
+ break;
+ }
+ printer (ctx, 0, 0, 0, sz, buf);
+ off += sz;
+ }
+ n--;
+ }
+
+ if (n != 0)
+ goto err;
+
+ n = op->T2 - op->T1 - (op->F2 - op->F1);
+ while (n > 0)
+ {
+ printer (ctx, CHG_CH, 0, 0, 1, "\n");
+ n--;
+ }
+ }
+ }
+#undef T2
+#undef T1
+#undef F2
+#undef F1
+
+ while ((sz = f_gets (buf, sizeof (buf), f)) != 0)
+ {
+ line++;
+ printer (ctx, EQU_CH, line, off, sz, buf);
+ off += sz;
+ while (buf[sz - 1] != '\n')
+ {
+ sz = f_gets (buf, sizeof (buf), f);
+ if (sz == 0)
+ {
+ printer (ctx, 0, 0, 0, 1, "\n");
+ break;
+ }
+ printer (ctx, 0, 0, 0, sz, buf);
+ off += sz;
+ }
+ }
+
+ f_close (f);
+ return 0;
+
+ err:
+ f_close (f);
+ return -1;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/* horizontal diff ********************************************************** */
+
+/**
+ * Longest common substring.
+ *
+ * @param s first string
+ * @param m length of first string
+ * @param t second string
+ * @param n length of second string
+ * @param ret list of offsets for longest common substrings inside each string
+ * @param min minimum length of common substrings
+ *
+ * @return 0 if success, nonzero otherwise
+ */
+
+static int
+lcsubstr (const char *s, int m, const char *t, int n, GArray * ret, int min)
+{
+ int i, j;
+ int *Lprev, *Lcurr;
+ int z = 0;
+
+ if (m < min || n < min)
+ {
+ /* XXX early culling */
+ return 0;
+ }
+
+ Lprev = g_try_new0 (int, n + 1);
+ if (Lprev == NULL)
+ return -1;
+
+ Lcurr = g_try_new0 (int, n + 1);
+ if (Lcurr == NULL)
+ {
+ g_free (Lprev);
+ return -1;
+ }
+
+ for (i = 0; i < m; i++)
+ {
+ int *L;
+
+ L = Lprev;
+ Lprev = Lcurr;
+ Lcurr = L;
+#ifdef USE_MEMSET_IN_LCS
+ memset (Lcurr, 0, (n + 1) * sizeof (*Lcurr));
+#endif
+ for (j = 0; j < n; j++)
+ {
+#ifndef USE_MEMSET_IN_LCS
+ Lcurr[j + 1] = 0;
+#endif
+ if (s[i] == t[j])
+ {
+ int v;
+
+ v = Lprev[j] + 1;
+ Lcurr[j + 1] = v;
+ if (z < v)
+ {
+ z = v;
+ g_array_set_size (ret, 0);
+ }
+ if (z == v && z >= min)
+ {
+ int off0, off1;
+ size_t k;
+
+ off0 = i - z + 1;
+ off1 = j - z + 1;
+
+ for (k = 0; k < ret->len; k++)
+ {
+ PAIR *p = (PAIR *) g_array_index (ret, PAIR, k);
+ if ((*p)[0] == off0 || (*p)[1] >= off1)
+ break;
+ }
+ if (k == ret->len)
+ {
+ PAIR p2;
+
+ p2[0] = off0;
+ p2[1] = off1;
+ g_array_append_val (ret, p2);
+ }
+ }
+ }
+ }
+ }
+
+ g_free (Lcurr);
+ g_free (Lprev);
+ return z;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Scan recursively for common substrings and build ranges.
+ *
+ * @param s first string
+ * @param t second string
+ * @param bracket current limits for both of the strings
+ * @param min minimum length of common substrings
+ * @param hdiff list of horizontal diff ranges to fill
+ * @param depth recursion depth
+ *
+ * @return 0 if success, nonzero otherwise
+ */
+
+static gboolean
+hdiff_multi (const char *s, const char *t, const BRACKET bracket, int min, GArray * hdiff,
+ unsigned int depth)
+{
+ BRACKET p;
+
+ if (depth-- != 0)
+ {
+ GArray *ret;
+ BRACKET b;
+ int len;
+
+ ret = g_array_new (FALSE, TRUE, sizeof (PAIR));
+ if (ret == NULL)
+ return FALSE;
+
+ len = lcsubstr (s + bracket[DIFF_LEFT].off, bracket[DIFF_LEFT].len,
+ t + bracket[DIFF_RIGHT].off, bracket[DIFF_RIGHT].len, ret, min);
+ if (ret->len != 0)
+ {
+ size_t k = 0;
+ const PAIR *data = (const PAIR *) &g_array_index (ret, PAIR, 0);
+ const PAIR *data2;
+
+ b[DIFF_LEFT].off = bracket[DIFF_LEFT].off;
+ b[DIFF_LEFT].len = (*data)[0];
+ b[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off;
+ b[DIFF_RIGHT].len = (*data)[1];
+ if (!hdiff_multi (s, t, b, min, hdiff, depth))
+ return FALSE;
+
+ for (k = 0; k < ret->len - 1; k++)
+ {
+ data = (const PAIR *) &g_array_index (ret, PAIR, k);
+ data2 = (const PAIR *) &g_array_index (ret, PAIR, k + 1);
+ b[DIFF_LEFT].off = bracket[DIFF_LEFT].off + (*data)[0] + len;
+ b[DIFF_LEFT].len = (*data2)[0] - (*data)[0] - len;
+ b[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off + (*data)[1] + len;
+ b[DIFF_RIGHT].len = (*data2)[1] - (*data)[1] - len;
+ if (!hdiff_multi (s, t, b, min, hdiff, depth))
+ return FALSE;
+ }
+ data = (const PAIR *) &g_array_index (ret, PAIR, k);
+ b[DIFF_LEFT].off = bracket[DIFF_LEFT].off + (*data)[0] + len;
+ b[DIFF_LEFT].len = bracket[DIFF_LEFT].len - (*data)[0] - len;
+ b[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off + (*data)[1] + len;
+ b[DIFF_RIGHT].len = bracket[DIFF_RIGHT].len - (*data)[1] - len;
+ if (!hdiff_multi (s, t, b, min, hdiff, depth))
+ return FALSE;
+
+ g_array_free (ret, TRUE);
+ return TRUE;
+ }
+ }
+
+ p[DIFF_LEFT].off = bracket[DIFF_LEFT].off;
+ p[DIFF_LEFT].len = bracket[DIFF_LEFT].len;
+ p[DIFF_RIGHT].off = bracket[DIFF_RIGHT].off;
+ p[DIFF_RIGHT].len = bracket[DIFF_RIGHT].len;
+ g_array_append_val (hdiff, p);
+
+ return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Build list of horizontal diff ranges.
+ *
+ * @param s first string
+ * @param m length of first string
+ * @param t second string
+ * @param n length of second string
+ * @param min minimum length of common substrings
+ * @param hdiff list of horizontal diff ranges to fill
+ * @param depth recursion depth
+ *
+ * @return 0 if success, nonzero otherwise
+ */
+
+static gboolean
+hdiff_scan (const char *s, int m, const char *t, int n, int min, GArray * hdiff, unsigned int depth)
+{
+ int i;
+ BRACKET b;
+
+ /* dumbscan (single horizontal diff) -- does not compress whitespace */
+ for (i = 0; i < m && i < n && s[i] == t[i]; i++)
+ ;
+ for (; m > i && n > i && s[m - 1] == t[n - 1]; m--, n--)
+ ;
+
+ b[DIFF_LEFT].off = i;
+ b[DIFF_LEFT].len = m - i;
+ b[DIFF_RIGHT].off = i;
+ b[DIFF_RIGHT].len = n - i;
+
+ /* smartscan (multiple horizontal diff) */
+ return hdiff_multi (s, t, b, min, hdiff, depth);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/* read line **************************************************************** */
+
+/**
+ * Check if character is inside horizontal diff limits.
+ *
+ * @param k rank of character inside line
+ * @param hdiff horizontal diff structure
+ * @param ord DIFF_LEFT if reading from first file, DIFF_RIGHT if reading from 2nd file
+ *
+ * @return TRUE if inside hdiff limits, FALSE otherwise
+ */
+
+static gboolean
+is_inside (int k, GArray * hdiff, diff_place_t ord)
+{
+ size_t i;
+ BRACKET *b;
+
+ for (i = 0; i < hdiff->len; i++)
+ {
+ int start, end;
+
+ b = &g_array_index (hdiff, BRACKET, i);
+ start = (*b)[ord].off;
+ end = start + (*b)[ord].len;
+ if (k >= start && k < end)
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Copy 'src' to 'dst' expanding tabs.
+ * @note The procedure returns when all bytes are consumed from 'src'
+ *
+ * @param dst destination buffer
+ * @param src source buffer
+ * @param srcsize size of src buffer
+ * @param base virtual base of this string, needed to calculate tabs
+ * @param ts tab size
+ *
+ * @return new virtual base
+ */
+
+static int
+cvt_cpy (char *dst, const char *src, size_t srcsize, int base, int ts)
+{
+ int i;
+
+ for (i = 0; srcsize != 0; i++, src++, dst++, srcsize--)
+ {
+ *dst = *src;
+ if (*src == '\t')
+ {
+ int j;
+
+ j = TAB_SKIP (ts, i + base);
+ i += j - 1;
+ while (j-- > 0)
+ *dst++ = ' ';
+ dst--;
+ }
+ }
+ return i + base;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Copy 'src' to 'dst' expanding tabs.
+ *
+ * @param dst destination buffer
+ * @param dstsize size of dst buffer
+ * @param[in,out] _src source buffer
+ * @param srcsize size of src buffer
+ * @param base virtual base of this string, needed to calculate tabs
+ * @param ts tab size
+ *
+ * @return new virtual base
+ *
+ * @note The procedure returns when all bytes are consumed from 'src'
+ * or 'dstsize' bytes are written to 'dst'
+ * @note Upon return, 'src' points to the first unwritten character in source
+ */
+
+static int
+cvt_ncpy (char *dst, int dstsize, const char **_src, size_t srcsize, int base, int ts)
+{
+ int i;
+ const char *src = *_src;
+
+ for (i = 0; i < dstsize && srcsize != 0; i++, src++, dst++, srcsize--)
+ {
+ *dst = *src;
+ if (*src == '\t')
+ {
+ int j;
+
+ j = TAB_SKIP (ts, i + base);
+ if (j > dstsize - i)
+ j = dstsize - i;
+ i += j - 1;
+ while (j-- > 0)
+ *dst++ = ' ';
+ dst--;
+ }
+ }
+ *_src = src;
+ return i + base;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Read line from memory, converting tabs to spaces and padding with spaces.
+ *
+ * @param src buffer to read from
+ * @param srcsize size of src buffer
+ * @param dst buffer to read to
+ * @param dstsize size of dst buffer, excluding trailing null
+ * @param skip number of characters to skip
+ * @param ts tab size
+ * @param show_cr show trailing carriage return as ^M
+ *
+ * @return negative on error, otherwise number of bytes except padding
+ */
+
+static int
+cvt_mget (const char *src, size_t srcsize, char *dst, int dstsize, int skip, int ts,
+ gboolean show_cr)
+{
+ int sz = 0;
+
+ if (src != NULL)
+ {
+ int i;
+ char *tmp = dst;
+ const int base = 0;
+
+ for (i = 0; dstsize != 0 && srcsize != 0 && *src != '\n'; i++, src++, srcsize--)
+ {
+ if (*src == '\t')
+ {
+ int j;
+
+ j = TAB_SKIP (ts, i + base);
+ i += j - 1;
+ while (j-- > 0)
+ {
+ if (skip > 0)
+ skip--;
+ else if (dstsize != 0)
+ {
+ dstsize--;
+ *dst++ = ' ';
+ }
+ }
+ }
+ else if (src[0] == '\r' && (srcsize == 1 || src[1] == '\n'))
+ {
+ if (skip == 0 && show_cr)
+ {
+ if (dstsize > 1)
+ {
+ dstsize -= 2;
+ *dst++ = '^';
+ *dst++ = 'M';
+ }
+ else
+ {
+ dstsize--;
+ *dst++ = '.';
+ }
+ }
+ break;
+ }
+ else if (skip > 0)
+ {
+#ifdef HAVE_CHARSET
+ int ch = 0;
+ int ch_length = 1;
+
+ (void) dview_get_utf (src, &ch, &ch_length);
+
+ if (ch_length > 1)
+ skip += ch_length - 1;
+#endif
+
+ skip--;
+ }
+ else
+ {
+ dstsize--;
+ *dst++ = *src;
+ }
+ }
+ sz = dst - tmp;
+ }
+ while (dstsize != 0)
+ {
+ dstsize--;
+ *dst++ = ' ';
+ }
+ *dst = '\0';
+ return sz;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Read line from memory and build attribute array.
+ *
+ * @param src buffer to read from
+ * @param srcsize size of src buffer
+ * @param dst buffer to read to
+ * @param dstsize size of dst buffer, excluding trailing null
+ * @param skip number of characters to skip
+ * @param ts tab size
+ * @param show_cr show trailing carriage return as ^M
+ * @param hdiff horizontal diff structure
+ * @param ord DIFF_LEFT if reading from first file, DIFF_RIGHT if reading from 2nd file
+ * @param att buffer of attributes
+ *
+ * @return negative on error, otherwise number of bytes except padding
+ */
+
+static int
+cvt_mgeta (const char *src, size_t srcsize, char *dst, int dstsize, int skip, int ts,
+ gboolean show_cr, GArray * hdiff, diff_place_t ord, char *att)
+{
+ int sz = 0;
+
+ if (src != NULL)
+ {
+ int i, k;
+ char *tmp = dst;
+ const int base = 0;
+
+ for (i = 0, k = 0; dstsize != 0 && srcsize != 0 && *src != '\n'; i++, k++, src++, srcsize--)
+ {
+ if (*src == '\t')
+ {
+ int j;
+
+ j = TAB_SKIP (ts, i + base);
+ i += j - 1;
+ while (j-- > 0)
+ {
+ if (skip != 0)
+ skip--;
+ else if (dstsize != 0)
+ {
+ dstsize--;
+ *att++ = is_inside (k, hdiff, ord);
+ *dst++ = ' ';
+ }
+ }
+ }
+ else if (src[0] == '\r' && (srcsize == 1 || src[1] == '\n'))
+ {
+ if (skip == 0 && show_cr)
+ {
+ if (dstsize > 1)
+ {
+ dstsize -= 2;
+ *att++ = is_inside (k, hdiff, ord);
+ *dst++ = '^';
+ *att++ = is_inside (k, hdiff, ord);
+ *dst++ = 'M';
+ }
+ else
+ {
+ dstsize--;
+ *att++ = is_inside (k, hdiff, ord);
+ *dst++ = '.';
+ }
+ }
+ break;
+ }
+ else if (skip != 0)
+ {
+#ifdef HAVE_CHARSET
+ int ch = 0;
+ int ch_length = 1;
+
+ (void) dview_get_utf (src, &ch, &ch_length);
+ if (ch_length > 1)
+ skip += ch_length - 1;
+#endif
+
+ skip--;
+ }
+ else
+ {
+ dstsize--;
+ *att++ = is_inside (k, hdiff, ord);
+ *dst++ = *src;
+ }
+ }
+ sz = dst - tmp;
+ }
+ while (dstsize != 0)
+ {
+ dstsize--;
+ *att++ = '\0';
+ *dst++ = ' ';
+ }
+ *dst = '\0';
+ return sz;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/**
+ * Read line from file, converting tabs to spaces and padding with spaces.
+ *
+ * @param f file stream to read from
+ * @param off offset of line inside file
+ * @param dst buffer to read to
+ * @param dstsize size of dst buffer, excluding trailing null
+ * @param skip number of characters to skip
+ * @param ts tab size
+ * @param show_cr show trailing carriage return as ^M
+ *
+ * @return negative on error, otherwise number of bytes except padding
+ */
+
+static int
+cvt_fget (FBUF * f, off_t off, char *dst, size_t dstsize, int skip, int ts, gboolean show_cr)
+{
+ int base = 0;
+ int old_base = base;
+ size_t amount = dstsize;
+ size_t useful, offset;
+ size_t i;
+ size_t sz;
+ int lastch = '\0';
+ const char *q = NULL;
+ char tmp[BUFSIZ]; /* XXX capacity must be >= MAX{dstsize + 1, amount} */
+ char cvt[BUFSIZ]; /* XXX capacity must be >= MAX_TAB_WIDTH * amount */
+
+ if (sizeof (tmp) < amount || sizeof (tmp) <= dstsize || sizeof (cvt) < 8 * amount)
+ {
+ /* abnormal, but avoid buffer overflow */
+ memset (dst, ' ', dstsize);
+ dst[dstsize] = '\0';
+ return 0;
+ }
+
+ f_seek (f, off, SEEK_SET);
+
+ while (skip > base)
+ {
+ old_base = base;
+ sz = f_gets (tmp, amount, f);
+ if (sz == 0)
+ break;
+
+ base = cvt_cpy (cvt, tmp, sz, old_base, ts);
+ if (cvt[base - old_base - 1] == '\n')
+ {
+ q = &cvt[base - old_base - 1];
+ base = old_base + q - cvt + 1;
+ break;
+ }
+ }
+
+ if (base < skip)
+ {
+ memset (dst, ' ', dstsize);
+ dst[dstsize] = '\0';
+ return 0;
+ }
+
+ useful = base - skip;
+ offset = skip - old_base;
+
+ if (useful <= dstsize)
+ {
+ if (useful != 0)
+ memmove (dst, cvt + offset, useful);
+
+ if (q == NULL)
+ {
+ sz = f_gets (tmp, dstsize - useful + 1, f);
+ if (sz != 0)
+ {
+ const char *ptr = tmp;
+
+ useful += cvt_ncpy (dst + useful, dstsize - useful, &ptr, sz, base, ts) - base;
+ if (ptr < tmp + sz)
+ lastch = *ptr;
+ }
+ }
+ sz = useful;
+ }
+ else
+ {
+ memmove (dst, cvt + offset, dstsize);
+ sz = dstsize;
+ lastch = cvt[offset + dstsize];
+ }
+
+ dst[sz] = lastch;
+ for (i = 0; i < sz && dst[i] != '\n'; i++)
+ {
+ if (dst[i] == '\r' && dst[i + 1] == '\n')
+ {
+ if (show_cr)
+ {
+ if (i + 1 < dstsize)
+ {
+ dst[i++] = '^';
+ dst[i++] = 'M';
+ }
+ else
+ {
+ dst[i++] = '*';
+ }
+ }
+ break;
+ }
+ }
+
+ for (; i < dstsize; i++)
+ dst[i] = ' ';
+ dst[i] = '\0';
+ return sz;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/* diff printers et al ****************************************************** */
+
+static void
+cc_free_elt (void *elt)
+{
+ DIFFLN *p = elt;
+
+ if (p != NULL)
+ g_free (p->p);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+printer (void *ctx, int ch, int line, off_t off, size_t sz, const char *str)
+{
+ GArray *a = ((PRINTER_CTX *) ctx)->a;
+ DSRC dsrc = ((PRINTER_CTX *) ctx)->dsrc;
+
+ if (ch != 0)
+ {
+ DIFFLN p;
+
+ p.p = NULL;
+ p.ch = ch;
+ p.line = line;
+ p.u.off = off;
+ if (dsrc == DATA_SRC_MEM && line != 0)
+ {
+ if (sz != 0 && str[sz - 1] == '\n')
+ sz--;
+ if (sz > 0)
+ p.p = g_strndup (str, sz);
+ p.u.len = sz;
+ }
+ g_array_append_val (a, p);
+ }
+ else if (dsrc == DATA_SRC_MEM)
+ {
+ DIFFLN *p;
+
+ p = &g_array_index (a, DIFFLN, a->len - 1);
+ if (sz != 0 && str[sz - 1] == '\n')
+ sz--;
+ if (sz != 0)
+ {
+ size_t new_size;
+ char *q;
+
+ new_size = p->u.len + sz;
+ q = g_realloc (p->p, new_size);
+ memcpy (q + p->u.len, str, sz);
+ p->p = q;
+ }
+ p->u.len += sz;
+ }
+ if (dsrc == DATA_SRC_TMP && (line != 0 || ch == 0))
+ {
+ FBUF *f = ((PRINTER_CTX *) ctx)->f;
+ f_write (f, str, sz);
+ }
+ return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+redo_diff (WDiff * dview)
+{
+ FBUF *const *f = dview->f;
+ PRINTER_CTX ctx;
+ GArray *ops;
+ int ndiff;
+ int rv;
+ char extra[256];
+
+ extra[0] = '\0';
+ if (dview->opt.quality == 2)
+ strcat (extra, " -d");
+ if (dview->opt.quality == 1)
+ strcat (extra, " --speed-large-files");
+ if (dview->opt.strip_trailing_cr)
+ strcat (extra, " --strip-trailing-cr");
+ if (dview->opt.ignore_tab_expansion)
+ strcat (extra, " -E");
+ if (dview->opt.ignore_space_change)
+ strcat (extra, " -b");
+ if (dview->opt.ignore_all_space)
+ strcat (extra, " -w");
+ if (dview->opt.ignore_case)
+ strcat (extra, " -i");
+
+ if (dview->dsrc != DATA_SRC_MEM)
+ {
+ f_reset (f[DIFF_LEFT]);
+ f_reset (f[DIFF_RIGHT]);
+ }
+
+ ops = g_array_new (FALSE, FALSE, sizeof (DIFFCMD));
+ ndiff = dff_execute (dview->args, extra, dview->file[DIFF_LEFT], dview->file[DIFF_RIGHT], ops);
+ if (ndiff < 0)
+ {
+ if (ops != NULL)
+ g_array_free (ops, TRUE);
+ return -1;
+ }
+
+ ctx.dsrc = dview->dsrc;
+
+ rv = 0;
+ ctx.a = dview->a[DIFF_LEFT];
+ ctx.f = f[DIFF_LEFT];
+ rv |= dff_reparse (DIFF_LEFT, dview->file[DIFF_LEFT], ops, printer, &ctx);
+
+ ctx.a = dview->a[DIFF_RIGHT];
+ ctx.f = f[DIFF_RIGHT];
+ rv |= dff_reparse (DIFF_RIGHT, dview->file[DIFF_RIGHT], ops, printer, &ctx);
+
+ if (ops != NULL)
+ g_array_free (ops, TRUE);
+
+ if (rv != 0 || dview->a[DIFF_LEFT]->len != dview->a[DIFF_RIGHT]->len)
+ return -1;
+
+ if (dview->dsrc == DATA_SRC_TMP)
+ {
+ f_trunc (f[DIFF_LEFT]);
+ f_trunc (f[DIFF_RIGHT]);
+ }
+
+ if (dview->dsrc == DATA_SRC_MEM && HDIFF_ENABLE)
+ {
+ dview->hdiff = g_ptr_array_new ();
+ if (dview->hdiff != NULL)
+ {
+ size_t i;
+
+ for (i = 0; i < dview->a[DIFF_LEFT]->len; i++)
+ {
+ GArray *h = NULL;
+ const DIFFLN *p;
+ const DIFFLN *q;
+
+ p = &g_array_index (dview->a[DIFF_LEFT], DIFFLN, i);
+ q = &g_array_index (dview->a[DIFF_RIGHT], DIFFLN, i);
+ if (p->line && q->line && p->ch == CHG_CH)
+ {
+ h = g_array_new (FALSE, FALSE, sizeof (BRACKET));
+ if (h != NULL)
+ {
+ gboolean runresult;
+
+ runresult =
+ hdiff_scan (p->p, p->u.len, q->p, q->u.len, HDIFF_MINCTX, h,
+ HDIFF_DEPTH);
+ if (!runresult)
+ {
+ g_array_free (h, TRUE);
+ h = NULL;
+ }
+ }
+ }
+ g_ptr_array_add (dview->hdiff, h);
+ }
+ }
+ }
+ return ndiff;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+destroy_hdiff (WDiff * dview)
+{
+ if (dview->hdiff != NULL)
+ {
+ int i;
+ int len;
+
+ len = dview->a[DIFF_LEFT]->len;
+
+ for (i = 0; i < len; i++)
+ {
+ GArray *h;
+
+ h = (GArray *) g_ptr_array_index (dview->hdiff, i);
+ if (h != NULL)
+ g_array_free (h, TRUE);
+ }
+ g_ptr_array_free (dview->hdiff, TRUE);
+ dview->hdiff = NULL;
+ }
+
+ mc_search_free (dview->search.handle);
+ dview->search.handle = NULL;
+ MC_PTR_FREE (dview->search.last_string);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/* stuff ******************************************************************** */
+
+static int
+get_digits (unsigned int n)
+{
+ int d = 1;
+
+ while (n /= 10)
+ d++;
+ return d;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+get_line_numbers (const GArray * a, size_t pos, int *linenum, int *lineofs)
+{
+ const DIFFLN *p;
+
+ *linenum = 0;
+ *lineofs = 0;
+
+ if (a->len != 0)
+ {
+ if (pos >= a->len)
+ pos = a->len - 1;
+
+ p = &g_array_index (a, DIFFLN, pos);
+
+ if (p->line == 0)
+ {
+ int n;
+
+ for (n = pos; n > 0; n--)
+ {
+ p--;
+ if (p->line != 0)
+ break;
+ }
+ *lineofs = pos - n + 1;
+ }
+
+ *linenum = p->line;
+ }
+ return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+calc_nwidth (const GArray * const *a)
+{
+ int l1, o1;
+ int l2, o2;
+
+ get_line_numbers (a[DIFF_LEFT], a[DIFF_LEFT]->len - 1, &l1, &o1);
+ get_line_numbers (a[DIFF_RIGHT], a[DIFF_RIGHT]->len - 1, &l2, &o2);
+ if (l1 < l2)
+ l1 = l2;
+ return get_digits (l1);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+find_prev_hunk (const GArray * a, int pos)
+{
+#if 1
+ while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH)
+ pos--;
+ while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch == EQU_CH)
+ pos--;
+ while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH)
+ pos--;
+ if (pos > 0 && (size_t) pos < a->len)
+ pos++;
+#else
+ while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos - 1))->ch == EQU_CH)
+ pos--;
+ while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos - 1))->ch != EQU_CH)
+ pos--;
+#endif
+
+ return pos;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static size_t
+find_next_hunk (const GArray * a, size_t pos)
+{
+ while (pos < a->len && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH)
+ pos++;
+ while (pos < a->len && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch == EQU_CH)
+ pos++;
+ return pos;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Find start and end lines of the current hunk.
+ *
+ * @param dview WDiff widget
+ * @return boolean and
+ * start_line1 first line of current hunk (file[0])
+ * end_line1 last line of current hunk (file[0])
+ * start_line1 first line of current hunk (file[0])
+ * end_line1 last line of current hunk (file[0])
+ */
+
+static int
+get_current_hunk (WDiff * dview, int *start_line1, int *end_line1, int *start_line2, int *end_line2)
+{
+ const GArray *a0 = dview->a[DIFF_LEFT];
+ const GArray *a1 = dview->a[DIFF_RIGHT];
+ size_t pos;
+ int ch;
+ int res = 0;
+
+ *start_line1 = 1;
+ *start_line2 = 1;
+ *end_line1 = 1;
+ *end_line2 = 1;
+
+ pos = dview->skip_rows;
+ ch = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch;
+ if (ch != EQU_CH)
+ {
+ switch (ch)
+ {
+ case ADD_CH:
+ res = DIFF_DEL;
+ break;
+ case DEL_CH:
+ res = DIFF_ADD;
+ break;
+ case CHG_CH:
+ res = DIFF_CHG;
+ break;
+ default:
+ break;
+ }
+ while (pos > 0 && ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch != EQU_CH)
+ pos--;
+ if (pos > 0)
+ {
+ *start_line1 = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->line + 1;
+ *start_line2 = ((DIFFLN *) & g_array_index (a1, DIFFLN, pos))->line + 1;
+ }
+ pos = dview->skip_rows;
+ while (pos < a0->len && ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch != EQU_CH)
+ {
+ int l0, l1;
+
+ l0 = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->line;
+ l1 = ((DIFFLN *) & g_array_index (a1, DIFFLN, pos))->line;
+ if (l0 > 0)
+ *end_line1 = MAX (*start_line1, l0);
+ if (l1 > 0)
+ *end_line2 = MAX (*start_line2, l1);
+ pos++;
+ }
+ }
+ return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Remove hunk from file.
+ *
+ * @param dview WDiff widget
+ * @param merge_file file stream for writing data
+ * @param from1 first line of hunk
+ * @param to1 last line of hunk
+ * @param merge_direction in what direction files should be merged
+ */
+
+static void
+dview_remove_hunk (WDiff * dview, FILE * merge_file, int from1, int to1,
+ action_direction_t merge_direction)
+{
+ int line;
+ char buf[BUF_10K];
+ FILE *f0;
+
+ if (merge_direction == FROM_RIGHT_TO_LEFT)
+ f0 = fopen (dview->file[DIFF_RIGHT], "r");
+ else
+ f0 = fopen (dview->file[DIFF_LEFT], "r");
+
+ line = 0;
+ while (fgets (buf, sizeof (buf), f0) != NULL && line < from1 - 1)
+ {
+ line++;
+ fputs (buf, merge_file);
+ }
+ while (fgets (buf, sizeof (buf), f0) != NULL)
+ {
+ line++;
+ if (line >= to1)
+ fputs (buf, merge_file);
+ }
+ fclose (f0);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Add hunk to file.
+ *
+ * @param dview WDiff widget
+ * @param merge_file file stream for writing data
+ * @param from1 first line of source hunk
+ * @param from2 first line of destination hunk
+ * @param to1 last line of source hunk
+ * @param merge_direction in what direction files should be merged
+ */
+
+static void
+dview_add_hunk (WDiff * dview, FILE * merge_file, int from1, int from2, int to2,
+ action_direction_t merge_direction)
+{
+ int line;
+ char buf[BUF_10K];
+ FILE *f0;
+ FILE *f1;
+
+ if (merge_direction == FROM_RIGHT_TO_LEFT)
+ {
+ f0 = fopen (dview->file[DIFF_RIGHT], "r");
+ f1 = fopen (dview->file[DIFF_LEFT], "r");
+ }
+ else
+ {
+ f0 = fopen (dview->file[DIFF_LEFT], "r");
+ f1 = fopen (dview->file[DIFF_RIGHT], "r");
+ }
+
+ line = 0;
+ while (fgets (buf, sizeof (buf), f0) != NULL && line < from1 - 1)
+ {
+ line++;
+ fputs (buf, merge_file);
+ }
+ line = 0;
+ while (fgets (buf, sizeof (buf), f1) != NULL && line <= to2)
+ {
+ line++;
+ if (line >= from2)
+ fputs (buf, merge_file);
+ }
+ while (fgets (buf, sizeof (buf), f0) != NULL)
+ fputs (buf, merge_file);
+
+ fclose (f0);
+ fclose (f1);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Replace hunk in file.
+ *
+ * @param dview WDiff widget
+ * @param merge_file file stream for writing data
+ * @param from1 first line of source hunk
+ * @param to1 last line of source hunk
+ * @param from2 first line of destination hunk
+ * @param to2 last line of destination hunk
+ * @param merge_direction in what direction files should be merged
+ */
+
+static void
+dview_replace_hunk (WDiff * dview, FILE * merge_file, int from1, int to1, int from2, int to2,
+ action_direction_t merge_direction)
+{
+ int line1 = 0, line2 = 0;
+ char buf[BUF_10K];
+ FILE *f0;
+ FILE *f1;
+
+ if (merge_direction == FROM_RIGHT_TO_LEFT)
+ {
+ f0 = fopen (dview->file[DIFF_RIGHT], "r");
+ f1 = fopen (dview->file[DIFF_LEFT], "r");
+ }
+ else
+ {
+ f0 = fopen (dview->file[DIFF_LEFT], "r");
+ f1 = fopen (dview->file[DIFF_RIGHT], "r");
+ }
+
+ while (fgets (buf, sizeof (buf), f0) != NULL && line1 < from1 - 1)
+ {
+ line1++;
+ fputs (buf, merge_file);
+ }
+ while (fgets (buf, sizeof (buf), f1) != NULL && line2 <= to2)
+ {
+ line2++;
+ if (line2 >= from2)
+ fputs (buf, merge_file);
+ }
+ while (fgets (buf, sizeof (buf), f0) != NULL)
+ {
+ line1++;
+ if (line1 > to1)
+ fputs (buf, merge_file);
+ }
+ fclose (f0);
+ fclose (f1);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Merge hunk.
+ *
+ * @param dview WDiff widget
+ * @param merge_direction in what direction files should be merged
+ */
+
+static void
+do_merge_hunk (WDiff * dview, action_direction_t merge_direction)
+{
+ int from1, to1, from2, to2;
+ int hunk;
+ diff_place_t n_merge = (merge_direction == FROM_RIGHT_TO_LEFT) ? DIFF_RIGHT : DIFF_LEFT;
+
+ if (merge_direction == FROM_RIGHT_TO_LEFT)
+ hunk = get_current_hunk (dview, &from2, &to2, &from1, &to1);
+ else
+ hunk = get_current_hunk (dview, &from1, &to1, &from2, &to2);
+
+ if (hunk > 0)
+ {
+ int merge_file_fd;
+ FILE *merge_file;
+ vfs_path_t *merge_file_name_vpath = NULL;
+
+ if (!dview->merged[n_merge])
+ {
+ dview->merged[n_merge] = mc_util_make_backup_if_possible (dview->file[n_merge], "~~~");
+ if (!dview->merged[n_merge])
+ {
+ message (D_ERROR, MSG_ERROR,
+ _("Cannot create backup file\n%s%s\n%s"),
+ dview->file[n_merge], "~~~", unix_error_string (errno));
+ return;
+ }
+ }
+
+ merge_file_fd = mc_mkstemps (&merge_file_name_vpath, "mcmerge", NULL);
+ if (merge_file_fd == -1)
+ {
+ message (D_ERROR, MSG_ERROR, _("Cannot create temporary merge file\n%s"),
+ unix_error_string (errno));
+ return;
+ }
+
+ merge_file = fdopen (merge_file_fd, "w");
+
+ switch (hunk)
+ {
+ case DIFF_DEL:
+ if (merge_direction == FROM_RIGHT_TO_LEFT)
+ dview_add_hunk (dview, merge_file, from1, from2, to2, FROM_RIGHT_TO_LEFT);
+ else
+ dview_remove_hunk (dview, merge_file, from1, to1, FROM_LEFT_TO_RIGHT);
+ break;
+ case DIFF_ADD:
+ if (merge_direction == FROM_RIGHT_TO_LEFT)
+ dview_remove_hunk (dview, merge_file, from1, to1, FROM_RIGHT_TO_LEFT);
+ else
+ dview_add_hunk (dview, merge_file, from1, from2, to2, FROM_LEFT_TO_RIGHT);
+ break;
+ case DIFF_CHG:
+ dview_replace_hunk (dview, merge_file, from1, to1, from2, to2, merge_direction);
+ break;
+ default:
+ break;
+ }
+ fflush (merge_file);
+ fclose (merge_file);
+ {
+ int res;
+
+ res = rewrite_backup_content (merge_file_name_vpath, dview->file[n_merge]);
+ (void) res;
+ }
+ mc_unlink (merge_file_name_vpath);
+ vfs_path_free (merge_file_name_vpath, TRUE);
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/* view routines and callbacks ********************************************** */
+
+static void
+dview_compute_split (WDiff * dview, int i)
+{
+ dview->bias += i;
+ if (dview->bias < 2 - dview->half1)
+ dview->bias = 2 - dview->half1;
+ if (dview->bias > dview->half2 - 2)
+ dview->bias = dview->half2 - 2;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_compute_areas (WDiff * dview)
+{
+ Widget *w = WIDGET (dview);
+
+ dview->height = w->rect.lines - 1;
+ dview->half1 = w->rect.cols / 2;
+ dview->half2 = w->rect.cols - dview->half1;
+
+ dview_compute_split (dview, 0);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_reread (WDiff * dview)
+{
+ int ndiff;
+
+ destroy_hdiff (dview);
+ if (dview->a[DIFF_LEFT] != NULL)
+ {
+ g_array_foreach (dview->a[DIFF_LEFT], DIFFLN, cc_free_elt);
+ g_array_free (dview->a[DIFF_LEFT], TRUE);
+ }
+ if (dview->a[DIFF_RIGHT] != NULL)
+ {
+ g_array_foreach (dview->a[DIFF_RIGHT], DIFFLN, cc_free_elt);
+ g_array_free (dview->a[DIFF_RIGHT], TRUE);
+ }
+
+ dview->a[DIFF_LEFT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
+ dview->a[DIFF_RIGHT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
+
+ ndiff = redo_diff (dview);
+ if (ndiff >= 0)
+ dview->ndiff = ndiff;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+#ifdef HAVE_CHARSET
+static void
+dview_set_codeset (WDiff * dview)
+{
+ const char *encoding_id = NULL;
+
+ dview->utf8 = TRUE;
+ encoding_id =
+ get_codepage_id (mc_global.source_codepage >=
+ 0 ? mc_global.source_codepage : mc_global.display_codepage);
+ if (encoding_id != NULL)
+ {
+ GIConv conv;
+
+ conv = str_crt_conv_from (encoding_id);
+ if (conv != INVALID_CONV)
+ {
+ if (dview->converter != str_cnv_from_term)
+ str_close_conv (dview->converter);
+ dview->converter = conv;
+ }
+ dview->utf8 = (gboolean) str_isutf8 (encoding_id);
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_select_encoding (WDiff * dview)
+{
+ if (do_select_codepage ())
+ dview_set_codeset (dview);
+ dview_reread (dview);
+ tty_touch_screen ();
+ repaint_screen ();
+}
+#endif /* HAVE_CHARSET */
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_load_options (WDiff * dview)
+{
+ gboolean show_numbers, show_symbols;
+ int tab_size;
+
+ show_symbols = mc_config_get_bool (mc_global.main_config, "DiffView", "show_symbols", FALSE);
+ if (show_symbols)
+ dview->display_symbols = 1;
+ show_numbers = mc_config_get_bool (mc_global.main_config, "DiffView", "show_numbers", FALSE);
+ if (show_numbers)
+ dview->display_numbers = calc_nwidth ((const GArray * const *) dview->a);
+ tab_size = mc_config_get_int (mc_global.main_config, "DiffView", "tab_size", 8);
+ if (tab_size > 0 && tab_size < 9)
+ dview->tab_size = tab_size;
+ else
+ dview->tab_size = 8;
+
+ dview->opt.quality = mc_config_get_int (mc_global.main_config, "DiffView", "diff_quality", 0);
+
+ dview->opt.strip_trailing_cr =
+ mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_tws", FALSE);
+ dview->opt.ignore_all_space =
+ mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_all_space", FALSE);
+ dview->opt.ignore_space_change =
+ mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_space_change", FALSE);
+ dview->opt.ignore_tab_expansion =
+ mc_config_get_bool (mc_global.main_config, "DiffView", "diff_tab_expansion", FALSE);
+ dview->opt.ignore_case =
+ mc_config_get_bool (mc_global.main_config, "DiffView", "diff_ignore_case", FALSE);
+
+ dview->new_frame = TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_save_options (WDiff * dview)
+{
+ mc_config_set_bool (mc_global.main_config, "DiffView", "show_symbols",
+ dview->display_symbols != 0);
+ mc_config_set_bool (mc_global.main_config, "DiffView", "show_numbers",
+ dview->display_numbers != 0);
+ mc_config_set_int (mc_global.main_config, "DiffView", "tab_size", dview->tab_size);
+
+ mc_config_set_int (mc_global.main_config, "DiffView", "diff_quality", dview->opt.quality);
+
+ mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_tws",
+ dview->opt.strip_trailing_cr);
+ mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_all_space",
+ dview->opt.ignore_all_space);
+ mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_space_change",
+ dview->opt.ignore_space_change);
+ mc_config_set_bool (mc_global.main_config, "DiffView", "diff_tab_expansion",
+ dview->opt.ignore_tab_expansion);
+ mc_config_set_bool (mc_global.main_config, "DiffView", "diff_ignore_case",
+ dview->opt.ignore_case);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_diff_options (WDiff * dview)
+{
+ const char *quality_str[] = {
+ N_("No&rmal"),
+ N_("&Fastest (Assume large files)"),
+ N_("&Minimal (Find a smaller set of change)")
+ };
+
+ quick_widget_t quick_widgets[] = {
+ /* *INDENT-OFF* */
+ QUICK_START_GROUPBOX (N_("Diff algorithm")),
+ QUICK_RADIO (3, (const char **) quality_str, (int *) &dview->opt.quality, NULL),
+ QUICK_STOP_GROUPBOX,
+ QUICK_START_GROUPBOX (N_("Diff extra options")),
+ QUICK_CHECKBOX (N_("&Ignore case"), &dview->opt.ignore_case, NULL),
+ QUICK_CHECKBOX (N_("Ignore tab &expansion"), &dview->opt.ignore_tab_expansion, NULL),
+ QUICK_CHECKBOX (N_("Ignore &space change"), &dview->opt.ignore_space_change, NULL),
+ QUICK_CHECKBOX (N_("Ignore all &whitespace"), &dview->opt.ignore_all_space, NULL),
+ QUICK_CHECKBOX (N_("Strip &trailing carriage return"), &dview->opt.strip_trailing_cr,
+ NULL),
+ QUICK_STOP_GROUPBOX,
+ QUICK_BUTTONS_OK_CANCEL,
+ QUICK_END
+ /* *INDENT-ON* */
+ };
+
+ WRect r = { -1, -1, 0, 56 };
+
+ quick_dialog_t qdlg = {
+ r, N_("Diff Options"), "[Diff Options]",
+ quick_widgets, NULL, NULL
+ };
+
+ if (quick_dialog (&qdlg) != B_CANCEL)
+ dview_reread (dview);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+dview_init (WDiff * dview, const char *args, const char *file1, const char *file2,
+ const char *label1, const char *label2, DSRC dsrc)
+{
+ int ndiff;
+ FBUF *f[DIFF_COUNT];
+
+ f[DIFF_LEFT] = NULL;
+ f[DIFF_RIGHT] = NULL;
+
+ if (dsrc == DATA_SRC_TMP)
+ {
+ f[DIFF_LEFT] = f_temp ();
+ if (f[DIFF_LEFT] == NULL)
+ return -1;
+
+ f[DIFF_RIGHT] = f_temp ();
+ if (f[DIFF_RIGHT] == NULL)
+ {
+ f_close (f[DIFF_LEFT]);
+ return -1;
+ }
+ }
+ else if (dsrc == DATA_SRC_ORG)
+ {
+ f[DIFF_LEFT] = f_open (file1, O_RDONLY);
+ if (f[DIFF_LEFT] == NULL)
+ return -1;
+
+ f[DIFF_RIGHT] = f_open (file2, O_RDONLY);
+ if (f[DIFF_RIGHT] == NULL)
+ {
+ f_close (f[DIFF_LEFT]);
+ return -1;
+ }
+ }
+
+ dview->view_quit = FALSE;
+
+ dview->bias = 0;
+ dview->new_frame = TRUE;
+ dview->skip_rows = 0;
+ dview->skip_cols = 0;
+ dview->display_symbols = 0;
+ dview->display_numbers = 0;
+ dview->show_cr = TRUE;
+ dview->tab_size = 8;
+ dview->ord = DIFF_LEFT;
+ dview->full = FALSE;
+
+ dview->search.handle = NULL;
+ dview->search.last_string = NULL;
+ dview->search.last_found_line = -1;
+ dview->search.last_accessed_num_line = -1;
+
+ dview_load_options (dview);
+
+ dview->args = args;
+ dview->file[DIFF_LEFT] = file1;
+ dview->file[DIFF_RIGHT] = file2;
+ dview->label[DIFF_LEFT] = g_strdup (label1);
+ dview->label[DIFF_RIGHT] = g_strdup (label2);
+ dview->f[DIFF_LEFT] = f[0];
+ dview->f[DIFF_RIGHT] = f[1];
+ dview->merged[DIFF_LEFT] = FALSE;
+ dview->merged[DIFF_RIGHT] = FALSE;
+ dview->hdiff = NULL;
+ dview->dsrc = dsrc;
+#ifdef HAVE_CHARSET
+ dview->converter = str_cnv_from_term;
+ dview_set_codeset (dview);
+#endif
+ dview->a[DIFF_LEFT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
+ dview->a[DIFF_RIGHT] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
+
+ ndiff = redo_diff (dview);
+ if (ndiff < 0)
+ {
+ /* goto MSG_DESTROY stage: dview_fini() */
+ f_close (f[DIFF_LEFT]);
+ f_close (f[DIFF_RIGHT]);
+ return -1;
+ }
+
+ dview->ndiff = ndiff;
+
+ dview_compute_areas (dview);
+
+ return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_fini (WDiff * dview)
+{
+ if (dview->dsrc != DATA_SRC_MEM)
+ {
+ f_close (dview->f[DIFF_RIGHT]);
+ f_close (dview->f[DIFF_LEFT]);
+ }
+
+#ifdef HAVE_CHARSET
+ if (dview->converter != str_cnv_from_term)
+ str_close_conv (dview->converter);
+#endif
+
+ destroy_hdiff (dview);
+ if (dview->a[DIFF_LEFT] != NULL)
+ {
+ g_array_foreach (dview->a[DIFF_LEFT], DIFFLN, cc_free_elt);
+ g_array_free (dview->a[DIFF_LEFT], TRUE);
+ dview->a[DIFF_LEFT] = NULL;
+ }
+ if (dview->a[DIFF_RIGHT] != NULL)
+ {
+ g_array_foreach (dview->a[DIFF_RIGHT], DIFFLN, cc_free_elt);
+ g_array_free (dview->a[DIFF_RIGHT], TRUE);
+ dview->a[DIFF_RIGHT] = NULL;
+ }
+
+ g_free (dview->label[DIFF_LEFT]);
+ g_free (dview->label[DIFF_RIGHT]);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+dview_display_file (const WDiff * dview, diff_place_t ord, int r, int c, int height, int width)
+{
+ size_t i, k;
+ int j;
+ char buf[BUFSIZ];
+ FBUF *f = dview->f[ord];
+ int skip = dview->skip_cols;
+ int display_symbols = dview->display_symbols;
+ int display_numbers = dview->display_numbers;
+ gboolean show_cr = dview->show_cr;
+ int tab_size = 8;
+ const DIFFLN *p;
+ int nwidth = display_numbers;
+ int xwidth;
+
+ xwidth = display_symbols + display_numbers;
+ if (dview->tab_size > 0 && dview->tab_size < 9)
+ tab_size = dview->tab_size;
+
+ if (xwidth != 0)
+ {
+ if (xwidth > width && display_symbols)
+ {
+ xwidth--;
+ display_symbols = 0;
+ }
+ if (xwidth > width && display_numbers)
+ {
+ xwidth = width;
+ display_numbers = width;
+ }
+
+ xwidth++;
+ c += xwidth;
+ width -= xwidth;
+ if (width < 0)
+ width = 0;
+ }
+
+ if ((int) sizeof (buf) <= width || (int) sizeof (buf) <= nwidth)
+ {
+ /* abnormal, but avoid buffer overflow */
+ return -1;
+ }
+
+ for (i = dview->skip_rows, j = 0; i < dview->a[ord]->len && j < height; j++, i++)
+ {
+ int ch, next_ch = 0, col;
+ size_t cnt;
+
+ p = (DIFFLN *) & g_array_index (dview->a[ord], DIFFLN, i);
+ ch = p->ch;
+ tty_setcolor (NORMAL_COLOR);
+ if (display_symbols)
+ {
+ tty_gotoyx (r + j, c - 2);
+ tty_print_char (ch);
+ }
+ if (p->line != 0)
+ {
+ if (display_numbers)
+ {
+ tty_gotoyx (r + j, c - xwidth);
+ g_snprintf (buf, display_numbers + 1, "%*d", nwidth, p->line);
+ tty_print_string (str_fit_to_term (buf, nwidth, J_LEFT_FIT));
+ }
+ if (ch == ADD_CH)
+ tty_setcolor (DFF_ADD_COLOR);
+ if (ch == CHG_CH)
+ tty_setcolor (DFF_CHG_COLOR);
+ if (f == NULL)
+ {
+ if (i == (size_t) dview->search.last_found_line)
+ tty_setcolor (MARKED_SELECTED_COLOR);
+ else if (dview->hdiff != NULL && g_ptr_array_index (dview->hdiff, i) != NULL)
+ {
+ char att[BUFSIZ];
+
+#ifdef HAVE_CHARSET
+ if (dview->utf8)
+ k = dview_str_utf8_offset_to_pos (p->p, width);
+ else
+#endif
+ k = width;
+
+ cvt_mgeta (p->p, p->u.len, buf, k, skip, tab_size, show_cr,
+ g_ptr_array_index (dview->hdiff, i), ord, att);
+ tty_gotoyx (r + j, c);
+ col = 0;
+
+ for (cnt = 0; cnt < strlen (buf) && col < width; cnt++)
+ {
+ gboolean ch_res;
+
+#ifdef HAVE_CHARSET
+ if (dview->utf8)
+ {
+ int ch_length = 0;
+
+ ch_res = dview_get_utf (buf + cnt, &next_ch, &ch_length);
+ if (ch_length > 1)
+ cnt += ch_length - 1;
+ if (!g_unichar_isprint (next_ch))
+ next_ch = '.';
+ }
+ else
+#endif
+ ch_res = dview_get_byte (buf + cnt, &next_ch);
+
+ if (ch_res)
+ {
+ tty_setcolor (att[cnt] ? DFF_CHH_COLOR : DFF_CHG_COLOR);
+#ifdef HAVE_CHARSET
+ if (mc_global.utf8_display)
+ {
+ if (!dview->utf8)
+ {
+ next_ch =
+ convert_from_8bit_to_utf_c ((unsigned char) next_ch,
+ dview->converter);
+ }
+ }
+ else if (dview->utf8)
+ next_ch = convert_from_utf_to_current_c (next_ch, dview->converter);
+ else
+ next_ch = convert_to_display_c (next_ch);
+#endif
+ tty_print_anychar (next_ch);
+ col++;
+ }
+ }
+ continue;
+ }
+
+ if (ch == CHG_CH)
+ tty_setcolor (DFF_CHH_COLOR);
+
+#ifdef HAVE_CHARSET
+ if (dview->utf8)
+ k = dview_str_utf8_offset_to_pos (p->p, width);
+ else
+#endif
+ k = width;
+ cvt_mget (p->p, p->u.len, buf, k, skip, tab_size, show_cr);
+ }
+ else
+ cvt_fget (f, p->u.off, buf, width, skip, tab_size, show_cr);
+ }
+ else
+ {
+ if (display_numbers)
+ {
+ tty_gotoyx (r + j, c - xwidth);
+ memset (buf, ' ', display_numbers);
+ buf[display_numbers] = '\0';
+ tty_print_string (buf);
+ }
+ if (ch == DEL_CH)
+ tty_setcolor (DFF_DEL_COLOR);
+ if (ch == CHG_CH)
+ tty_setcolor (DFF_CHD_COLOR);
+ memset (buf, ' ', width);
+ buf[width] = '\0';
+ }
+ tty_gotoyx (r + j, c);
+ /* tty_print_nstring (buf, width); */
+ col = 0;
+ for (cnt = 0; cnt < strlen (buf) && col < width; cnt++)
+ {
+ gboolean ch_res;
+
+#ifdef HAVE_CHARSET
+ if (dview->utf8)
+ {
+ int ch_length = 0;
+
+ ch_res = dview_get_utf (buf + cnt, &next_ch, &ch_length);
+ if (ch_length > 1)
+ cnt += ch_length - 1;
+ if (!g_unichar_isprint (next_ch))
+ next_ch = '.';
+ }
+ else
+#endif
+ ch_res = dview_get_byte (buf + cnt, &next_ch);
+
+ if (ch_res)
+ {
+#ifdef HAVE_CHARSET
+ if (mc_global.utf8_display)
+ {
+ if (!dview->utf8)
+ {
+ next_ch =
+ convert_from_8bit_to_utf_c ((unsigned char) next_ch, dview->converter);
+ }
+ }
+ else if (dview->utf8)
+ next_ch = convert_from_utf_to_current_c (next_ch, dview->converter);
+ else
+ next_ch = convert_to_display_c (next_ch);
+#endif
+
+ tty_print_anychar (next_ch);
+ col++;
+ }
+ }
+ }
+ tty_setcolor (NORMAL_COLOR);
+ k = width;
+ if (width < xwidth - 1)
+ k = xwidth - 1;
+ memset (buf, ' ', k);
+ buf[k] = '\0';
+ for (; j < height; j++)
+ {
+ if (xwidth != 0)
+ {
+ tty_gotoyx (r + j, c - xwidth);
+ /* tty_print_nstring (buf, xwidth - 1); */
+ tty_print_string (str_fit_to_term (buf, xwidth - 1, J_LEFT_FIT));
+ }
+ tty_gotoyx (r + j, c);
+ /* tty_print_nstring (buf, width); */
+ tty_print_string (str_fit_to_term (buf, width, J_LEFT_FIT));
+ }
+
+ return 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_status (const WDiff * dview, diff_place_t ord, int width, int c)
+{
+ const char *buf;
+ int filename_width;
+ int linenum, lineofs;
+ vfs_path_t *vpath;
+ char *path;
+
+ tty_setcolor (STATUSBAR_COLOR);
+
+ tty_gotoyx (0, c);
+ get_line_numbers (dview->a[ord], dview->skip_rows, &linenum, &lineofs);
+
+ filename_width = width - 24;
+ if (filename_width < 8)
+ filename_width = 8;
+
+ vpath = vfs_path_from_str (dview->label[ord]);
+ path = vfs_path_to_str_flags (vpath, 0, VPF_STRIP_HOME | VPF_STRIP_PASSWORD);
+ vfs_path_free (vpath, TRUE);
+ buf = str_term_trim (path, filename_width);
+ if (ord == DIFF_LEFT)
+ tty_printf ("%s%-*s %6d+%-4d Col %-4d ", dview->merged[ord] ? "* " : " ", filename_width,
+ buf, linenum, lineofs, dview->skip_cols);
+ else
+ tty_printf ("%s%-*s %6d+%-4d Dif %-4d ", dview->merged[ord] ? "* " : " ", filename_width,
+ buf, linenum, lineofs, dview->ndiff);
+ g_free (path);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_redo (WDiff * dview)
+{
+ if (dview->display_numbers)
+ {
+ int old;
+
+ old = dview->display_numbers;
+ dview->display_numbers = calc_nwidth ((const GArray * const *) dview->a);
+ dview->new_frame = (old != dview->display_numbers);
+ }
+ dview_reread (dview);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_update (WDiff * dview)
+{
+ int height = dview->height;
+ int width1;
+ int width2;
+ int last;
+
+ last = dview->a[DIFF_LEFT]->len - 1;
+
+ if (dview->skip_rows > last)
+ dview->skip_rows = dview->search.last_accessed_num_line = last;
+ if (dview->skip_rows < 0)
+ dview->skip_rows = dview->search.last_accessed_num_line = 0;
+ if (dview->skip_cols < 0)
+ dview->skip_cols = 0;
+
+ if (height < 2)
+ return;
+
+ width1 = dview->half1 + dview->bias;
+ width2 = dview->half2 - dview->bias;
+ if (dview->full)
+ {
+ width1 = COLS;
+ width2 = 0;
+ }
+
+ if (dview->new_frame)
+ {
+ int xwidth;
+
+ tty_setcolor (NORMAL_COLOR);
+ xwidth = dview->display_symbols + dview->display_numbers;
+ if (width1 > 1)
+ tty_draw_box (1, 0, height, width1, FALSE);
+ if (width2 > 1)
+ tty_draw_box (1, width1, height, width2, FALSE);
+
+ if (xwidth != 0)
+ {
+ xwidth++;
+ if (xwidth < width1 - 1)
+ {
+ tty_gotoyx (1, xwidth);
+ tty_print_alt_char (ACS_TTEE, FALSE);
+ tty_gotoyx (height, xwidth);
+ tty_print_alt_char (ACS_BTEE, FALSE);
+ tty_draw_vline (2, xwidth, ACS_VLINE, height - 2);
+ }
+ if (xwidth < width2 - 1)
+ {
+ tty_gotoyx (1, width1 + xwidth);
+ tty_print_alt_char (ACS_TTEE, FALSE);
+ tty_gotoyx (height, width1 + xwidth);
+ tty_print_alt_char (ACS_BTEE, FALSE);
+ tty_draw_vline (2, width1 + xwidth, ACS_VLINE, height - 2);
+ }
+ }
+ dview->new_frame = FALSE;
+ }
+
+ if (width1 > 2)
+ {
+ dview_status (dview, dview->ord, width1, 0);
+ dview_display_file (dview, dview->ord, 2, 1, height - 2, width1 - 2);
+ }
+ if (width2 > 2)
+ {
+ dview_status (dview, dview->ord ^ 1, width2, width1);
+ dview_display_file (dview, dview->ord ^ 1, 2, width1 + 1, height - 2, width2 - 2);
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_edit (WDiff * dview, diff_place_t ord)
+{
+ Widget *h;
+ gboolean h_modal;
+ int linenum, lineofs;
+
+ if (dview->dsrc == DATA_SRC_TMP)
+ {
+ error_dialog (_("Edit"), _("Edit is disabled"));
+ return;
+ }
+
+ h = WIDGET (WIDGET (dview)->owner);
+ h_modal = widget_get_state (h, WST_MODAL);
+
+ get_line_numbers (dview->a[ord], dview->skip_rows, &linenum, &lineofs);
+
+ /* disallow edit file in several editors */
+ widget_set_state (h, WST_MODAL, TRUE);
+
+ {
+ vfs_path_t *tmp_vpath;
+
+ tmp_vpath = vfs_path_from_str (dview->file[ord]);
+ edit_file_at_line (tmp_vpath, use_internal_edit, linenum);
+ vfs_path_free (tmp_vpath, TRUE);
+ }
+
+ widget_set_state (h, WST_MODAL, h_modal);
+ dview_redo (dview);
+ dview_update (dview);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_goto_cmd (WDiff * dview, diff_place_t ord)
+{
+ static gboolean first_run = TRUE;
+
+ /* *INDENT-OFF* */
+ static const char *title[2] = {
+ N_("Goto line (left)"),
+ N_("Goto line (right)")
+ };
+ /* *INDENT-ON* */
+
+ int newline;
+ char *input;
+
+ input =
+ input_dialog (_(title[ord]), _("Enter line:"), MC_HISTORY_YDIFF_GOTO_LINE,
+ first_run ? NULL : INPUT_LAST_TEXT, INPUT_COMPLETE_NONE);
+ if (input != NULL)
+ {
+ const char *s = input;
+
+ if (scan_deci (&s, &newline) == 0 && *s == '\0')
+ {
+ size_t i = 0;
+
+ if (newline > 0)
+ {
+ for (; i < dview->a[ord]->len; i++)
+ {
+ const DIFFLN *p;
+
+ p = &g_array_index (dview->a[ord], DIFFLN, i);
+ if (p->line == newline)
+ break;
+ }
+ }
+ dview->skip_rows = dview->search.last_accessed_num_line = (ssize_t) i;
+ }
+ g_free (input);
+ }
+
+ first_run = FALSE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_labels (WDiff * dview)
+{
+ Widget *d = WIDGET (dview);
+ WButtonBar *b;
+
+ b = buttonbar_find (DIALOG (d->owner));
+
+ buttonbar_set_label (b, 1, Q_ ("ButtonBar|Help"), d->keymap, d);
+ buttonbar_set_label (b, 2, Q_ ("ButtonBar|Save"), d->keymap, d);
+ buttonbar_set_label (b, 4, Q_ ("ButtonBar|Edit"), d->keymap, d);
+ buttonbar_set_label (b, 5, Q_ ("ButtonBar|Merge"), d->keymap, d);
+ buttonbar_set_label (b, 7, Q_ ("ButtonBar|Search"), d->keymap, d);
+ buttonbar_set_label (b, 9, Q_ ("ButtonBar|Options"), d->keymap, d);
+ buttonbar_set_label (b, 10, Q_ ("ButtonBar|Quit"), d->keymap, d);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static gboolean
+dview_save (WDiff * dview)
+{
+ gboolean res = TRUE;
+
+ if (dview->merged[DIFF_LEFT])
+ {
+ res = mc_util_unlink_backup_if_possible (dview->file[DIFF_LEFT], "~~~");
+ dview->merged[DIFF_LEFT] = !res;
+ }
+ if (dview->merged[DIFF_RIGHT])
+ {
+ res = mc_util_unlink_backup_if_possible (dview->file[DIFF_RIGHT], "~~~");
+ dview->merged[DIFF_RIGHT] = !res;
+ }
+ return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_do_save (WDiff * dview)
+{
+ (void) dview_save (dview);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/*
+ * Check if it's OK to close the diff viewer. If there are unsaved changes,
+ * ask user.
+ */
+static gboolean
+dview_ok_to_exit (WDiff * dview)
+{
+ gboolean res = TRUE;
+ int act;
+
+ if (!dview->merged[DIFF_LEFT] && !dview->merged[DIFF_RIGHT])
+ return res;
+
+ act = query_dialog (_("Quit"), !mc_global.midnight_shutdown ?
+ _("File(s) was modified. Save with exit?") :
+ _("Midnight Commander is being shut down.\nSave modified file(s)?"),
+ D_NORMAL, 2, _("&Yes"), _("&No"));
+
+ /* Esc is No */
+ if (mc_global.midnight_shutdown || (act == -1))
+ act = 1;
+
+ switch (act)
+ {
+ case -1: /* Esc */
+ res = FALSE;
+ break;
+ case 0: /* Yes */
+ (void) dview_save (dview);
+ res = TRUE;
+ break;
+ case 1: /* No */
+ if (mc_util_restore_from_backup_if_possible (dview->file[DIFF_LEFT], "~~~"))
+ res = mc_util_unlink_backup_if_possible (dview->file[DIFF_LEFT], "~~~");
+ if (mc_util_restore_from_backup_if_possible (dview->file[DIFF_RIGHT], "~~~"))
+ res = mc_util_unlink_backup_if_possible (dview->file[DIFF_RIGHT], "~~~");
+ MC_FALLTHROUGH;
+ default:
+ res = TRUE;
+ break;
+ }
+ return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static cb_ret_t
+dview_execute_cmd (WDiff * dview, long command)
+{
+ cb_ret_t res = MSG_HANDLED;
+
+ switch (command)
+ {
+ case CK_ShowSymbols:
+ dview->display_symbols ^= 1;
+ dview->new_frame = TRUE;
+ break;
+ case CK_ShowNumbers:
+ dview->display_numbers ^= calc_nwidth ((const GArray * const *) dview->a);
+ dview->new_frame = TRUE;
+ break;
+ case CK_SplitFull:
+ dview->full = !dview->full;
+ dview->new_frame = TRUE;
+ break;
+ case CK_SplitEqual:
+ if (!dview->full)
+ {
+ dview->bias = 0;
+ dview->new_frame = TRUE;
+ }
+ break;
+ case CK_SplitMore:
+ if (!dview->full)
+ {
+ dview_compute_split (dview, 1);
+ dview->new_frame = TRUE;
+ }
+ break;
+
+ case CK_SplitLess:
+ if (!dview->full)
+ {
+ dview_compute_split (dview, -1);
+ dview->new_frame = TRUE;
+ }
+ break;
+ case CK_Tab2:
+ dview->tab_size = 2;
+ break;
+ case CK_Tab3:
+ dview->tab_size = 3;
+ break;
+ case CK_Tab4:
+ dview->tab_size = 4;
+ break;
+ case CK_Tab8:
+ dview->tab_size = 8;
+ break;
+ case CK_Swap:
+ dview->ord ^= 1;
+ break;
+ case CK_Redo:
+ dview_redo (dview);
+ break;
+ case CK_HunkNext:
+ dview->skip_rows = dview->search.last_accessed_num_line =
+ find_next_hunk (dview->a[DIFF_LEFT], dview->skip_rows);
+ break;
+ case CK_HunkPrev:
+ dview->skip_rows = dview->search.last_accessed_num_line =
+ find_prev_hunk (dview->a[DIFF_LEFT], dview->skip_rows);
+ break;
+ case CK_Goto:
+ dview_goto_cmd (dview, DIFF_RIGHT);
+ break;
+ case CK_Edit:
+ dview_edit (dview, dview->ord);
+ break;
+ case CK_Merge:
+ do_merge_hunk (dview, FROM_LEFT_TO_RIGHT);
+ dview_redo (dview);
+ break;
+ case CK_MergeOther:
+ do_merge_hunk (dview, FROM_RIGHT_TO_LEFT);
+ dview_redo (dview);
+ break;
+ case CK_EditOther:
+ dview_edit (dview, dview->ord ^ 1);
+ break;
+ case CK_Search:
+ dview_search_cmd (dview);
+ break;
+ case CK_SearchContinue:
+ dview_continue_search_cmd (dview);
+ break;
+ case CK_Top:
+ dview->skip_rows = dview->search.last_accessed_num_line = 0;
+ break;
+ case CK_Bottom:
+ dview->skip_rows = dview->search.last_accessed_num_line = dview->a[DIFF_LEFT]->len - 1;
+ break;
+ case CK_Up:
+ if (dview->skip_rows > 0)
+ {
+ dview->skip_rows--;
+ dview->search.last_accessed_num_line = dview->skip_rows;
+ }
+ break;
+ case CK_Down:
+ dview->skip_rows++;
+ dview->search.last_accessed_num_line = dview->skip_rows;
+ break;
+ case CK_PageDown:
+ if (dview->height > 2)
+ {
+ dview->skip_rows += dview->height - 2;
+ dview->search.last_accessed_num_line = dview->skip_rows;
+ }
+ break;
+ case CK_PageUp:
+ if (dview->height > 2)
+ {
+ dview->skip_rows -= dview->height - 2;
+ dview->search.last_accessed_num_line = dview->skip_rows;
+ }
+ break;
+ case CK_Left:
+ dview->skip_cols--;
+ break;
+ case CK_Right:
+ dview->skip_cols++;
+ break;
+ case CK_LeftQuick:
+ dview->skip_cols -= 8;
+ break;
+ case CK_RightQuick:
+ dview->skip_cols += 8;
+ break;
+ case CK_Home:
+ dview->skip_cols = 0;
+ break;
+ case CK_Shell:
+ toggle_subshell ();
+ break;
+ case CK_Quit:
+ dview->view_quit = TRUE;
+ break;
+ case CK_Save:
+ dview_do_save (dview);
+ break;
+ case CK_Options:
+ dview_diff_options (dview);
+ break;
+#ifdef HAVE_CHARSET
+ case CK_SelectCodepage:
+ dview_select_encoding (dview);
+ break;
+#endif
+ case CK_Cancel:
+ /* don't close diffviewer due to SIGINT */
+ break;
+ default:
+ res = MSG_NOT_HANDLED;
+ }
+ return res;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static cb_ret_t
+dview_handle_key (WDiff * dview, int key)
+{
+ long command;
+
+#ifdef HAVE_CHARSET
+ key = convert_from_input_c (key);
+#endif
+
+ command = widget_lookup_key (WIDGET (dview), key);
+ if (command == CK_IgnoreKey)
+ return MSG_NOT_HANDLED;
+
+ return dview_execute_cmd (dview, command);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static cb_ret_t
+dview_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
+{
+ WDiff *dview = (WDiff *) w;
+ WDialog *h = DIALOG (w->owner);
+ cb_ret_t i;
+
+ switch (msg)
+ {
+ case MSG_INIT:
+ dview_labels (dview);
+ dview_update (dview);
+ return MSG_HANDLED;
+
+ case MSG_DRAW:
+ dview->new_frame = TRUE;
+ dview_update (dview);
+ return MSG_HANDLED;
+
+ case MSG_KEY:
+ i = dview_handle_key (dview, parm);
+ if (dview->view_quit)
+ dlg_close (h);
+ else
+ dview_update (dview);
+ return i;
+
+ case MSG_ACTION:
+ i = dview_execute_cmd (dview, parm);
+ if (dview->view_quit)
+ dlg_close (h);
+ else
+ dview_update (dview);
+ return i;
+
+ case MSG_RESIZE:
+ widget_default_callback (w, NULL, MSG_RESIZE, 0, data);
+ dview_compute_areas (dview);
+ return MSG_HANDLED;
+
+ case MSG_DESTROY:
+ dview_save_options (dview);
+ dview_fini (dview);
+ return MSG_HANDLED;
+
+ default:
+ return widget_default_callback (w, sender, msg, parm, data);
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+dview_mouse_callback (Widget * w, mouse_msg_t msg, mouse_event_t * event)
+{
+ WDiff *dview = (WDiff *) w;
+
+ (void) event;
+
+ switch (msg)
+ {
+ case MSG_MOUSE_SCROLL_UP:
+ case MSG_MOUSE_SCROLL_DOWN:
+ if (msg == MSG_MOUSE_SCROLL_UP)
+ dview->skip_rows -= 2;
+ else
+ dview->skip_rows += 2;
+
+ dview->search.last_accessed_num_line = dview->skip_rows;
+ dview_update (dview);
+ break;
+
+ default:
+ break;
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static cb_ret_t
+dview_dialog_callback (Widget * w, Widget * sender, widget_msg_t msg, int parm, void *data)
+{
+ WDiff *dview;
+ WDialog *h = DIALOG (w);
+
+ switch (msg)
+ {
+ case MSG_ACTION:
+ /* Handle shortcuts. */
+
+ /* Note: the buttonbar sends messages directly to the the WDiff, not to
+ * here, which is why we can pass NULL in the following call. */
+ return dview_execute_cmd (NULL, parm);
+
+ case MSG_VALIDATE:
+ dview = (WDiff *) widget_find_by_type (CONST_WIDGET (h), dview_callback);
+ /* don't stop the dialog before final decision */
+ widget_set_state (w, WST_ACTIVE, TRUE);
+ if (dview_ok_to_exit (dview))
+ dlg_close (h);
+ return MSG_HANDLED;
+
+ default:
+ return dlg_default_callback (w, sender, msg, parm, data);
+ }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static char *
+dview_get_title (const WDialog * h, size_t len)
+{
+ const WDiff *dview;
+ const char *modified = " (*) ";
+ const char *notmodified = " ";
+ size_t len1;
+ GString *title;
+
+ dview = (const WDiff *) widget_find_by_type (CONST_WIDGET (h), dview_callback);
+ len1 = (len - str_term_width1 (_("Diff:")) - strlen (modified) - 3) / 2;
+
+ title = g_string_sized_new (len);
+ g_string_append (title, _("Diff:"));
+ g_string_append (title, dview->merged[DIFF_LEFT] ? modified : notmodified);
+ g_string_append (title, str_term_trim (dview->label[DIFF_LEFT], len1));
+ g_string_append (title, " | ");
+ g_string_append (title, dview->merged[DIFF_RIGHT] ? modified : notmodified);
+ g_string_append (title, str_term_trim (dview->label[DIFF_RIGHT], len1));
+
+ return g_string_free (title, FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+diff_view (const char *file1, const char *file2, const char *label1, const char *label2)
+{
+ int error;
+ WDiff *dview;
+ Widget *w;
+ WDialog *dview_dlg;
+ Widget *dw;
+ WRect r;
+ WGroup *g;
+
+ /* Create dialog and widgets, put them on the dialog */
+ dview_dlg =
+ dlg_create (FALSE, 0, 0, 1, 1, WPOS_FULLSCREEN, FALSE, NULL, dview_dialog_callback, NULL,
+ "[Diff Viewer]", NULL);
+ dw = WIDGET (dview_dlg);
+ widget_want_tab (dw, TRUE);
+ r = dw->rect;
+
+ g = GROUP (dview_dlg);
+
+ dview = g_new0 (WDiff, 1);
+ w = WIDGET (dview);
+ r.lines--;
+ widget_init (w, &r, dview_callback, dview_mouse_callback);
+ w->options |= WOP_SELECTABLE;
+ w->keymap = diff_map;
+ group_add_widget_autopos (g, w, WPOS_KEEP_ALL, NULL);
+
+ w = WIDGET (buttonbar_new ());
+ group_add_widget_autopos (g, w, w->pos_flags, NULL);
+
+ dview_dlg->get_title = dview_get_title;
+
+ error = dview_init (dview, "-a", file1, file2, label1, label2, DATA_SRC_MEM); /* XXX binary diff? */
+
+ if (error == 0)
+ dlg_run (dview_dlg);
+
+ if (error != 0 || widget_get_state (dw, WST_CLOSED))
+ widget_destroy (dw);
+
+ return error == 0 ? 1 : 0;
+}
+
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+#define GET_FILE_AND_STAMP(n) \
+do \
+{ \
+ use_copy##n = 0; \
+ real_file##n = file##n; \
+ if (!vfs_file_is_local (file##n)) \
+ { \
+ real_file##n = mc_getlocalcopy (file##n); \
+ if (real_file##n != NULL) \
+ { \
+ use_copy##n = 1; \
+ if (mc_stat (real_file##n, &st##n) != 0) \
+ use_copy##n = -1; \
+ } \
+ } \
+} \
+while (0)
+
+#define UNGET_FILE(n) \
+do \
+{ \
+ if (use_copy##n) \
+ { \
+ int changed = 0; \
+ if (use_copy##n > 0) \
+ { \
+ time_t mtime; \
+ mtime = st##n.st_mtime; \
+ if (mc_stat (real_file##n, &st##n) == 0) \
+ changed = (mtime != st##n.st_mtime); \
+ } \
+ mc_ungetlocalcopy (file##n, real_file##n, changed); \
+ vfs_path_free (real_file##n, TRUE); \
+ } \
+} \
+while (0)
+
+gboolean
+dview_diff_cmd (const void *f0, const void *f1)
+{
+ int rv = 0;
+ vfs_path_t *file0 = NULL;
+ vfs_path_t *file1 = NULL;
+ gboolean is_dir0 = FALSE;
+ gboolean is_dir1 = FALSE;
+
+ switch (mc_global.mc_run_mode)
+ {
+ case MC_RUN_FULL:
+ {
+ /* run from panels */
+ const WPanel *panel0 = (const WPanel *) f0;
+ const WPanel *panel1 = (const WPanel *) f1;
+ const file_entry_t *fe0;
+ const file_entry_t *fe1;
+
+ fe0 = panel_current_entry (panel0);
+ file0 = vfs_path_append_new (panel0->cwd_vpath, fe0->fname->str, (char *) NULL);
+ is_dir0 = S_ISDIR (fe0->st.st_mode);
+ if (is_dir0)
+ {
+ message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"),
+ path_trunc (fe0->fname->str, 30));
+ goto ret;
+ }
+
+ fe1 = panel_current_entry (panel1);
+ file1 = vfs_path_append_new (panel1->cwd_vpath, fe1->fname->str, (char *) NULL);
+ is_dir1 = S_ISDIR (fe1->st.st_mode);
+ if (is_dir1)
+ {
+ message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"),
+ path_trunc (fe1->fname->str, 30));
+ goto ret;
+ }
+ break;
+ }
+
+ case MC_RUN_DIFFVIEWER:
+ {
+ /* run from command line */
+ const char *p0 = (const char *) f0;
+ const char *p1 = (const char *) f1;
+ struct stat st;
+
+ file0 = vfs_path_from_str (p0);
+ if (mc_stat (file0, &st) == 0)
+ {
+ is_dir0 = S_ISDIR (st.st_mode);
+ if (is_dir0)
+ {
+ message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"), path_trunc (p0, 30));
+ goto ret;
+ }
+ }
+ else
+ {
+ message (D_ERROR, MSG_ERROR, _("Cannot stat \"%s\"\n%s"),
+ path_trunc (p0, 30), unix_error_string (errno));
+ goto ret;
+ }
+
+ file1 = vfs_path_from_str (p1);
+ if (mc_stat (file1, &st) == 0)
+ {
+ is_dir1 = S_ISDIR (st.st_mode);
+ if (is_dir1)
+ {
+ message (D_ERROR, MSG_ERROR, _("\"%s\" is a directory"), path_trunc (p1, 30));
+ goto ret;
+ }
+ }
+ else
+ {
+ message (D_ERROR, MSG_ERROR, _("Cannot stat \"%s\"\n%s"),
+ path_trunc (p1, 30), unix_error_string (errno));
+ goto ret;
+ }
+ break;
+ }
+
+ default:
+ /* this should not happened */
+ message (D_ERROR, MSG_ERROR, _("Diff viewer: invalid mode"));
+ return FALSE;
+ }
+
+ if (rv == 0)
+ {
+ rv = -1;
+ if (file0 != NULL && file1 != NULL)
+ {
+ int use_copy0;
+ int use_copy1;
+ struct stat st0;
+ struct stat st1;
+ vfs_path_t *real_file0;
+ vfs_path_t *real_file1;
+
+ GET_FILE_AND_STAMP (0);
+ GET_FILE_AND_STAMP (1);
+
+ if (real_file0 != NULL && real_file1 != NULL)
+ rv = diff_view (vfs_path_as_str (real_file0), vfs_path_as_str (real_file1),
+ vfs_path_as_str (file0), vfs_path_as_str (file1));
+
+ UNGET_FILE (1);
+ UNGET_FILE (0);
+ }
+ }
+
+ if (rv == 0)
+ message (D_ERROR, MSG_ERROR, _("Two files are needed to compare"));
+
+ ret:
+ vfs_path_free (file1, TRUE);
+ vfs_path_free (file0, TRUE);
+
+ return (rv != 0);
+}
+
+#undef GET_FILE_AND_STAMP
+#undef UNGET_FILE
+
+/* --------------------------------------------------------------------------------------------- */
diff --git a/src/diffviewer/ydiff.h b/src/diffviewer/ydiff.h
new file mode 100644
index 0000000..90462c0
--- /dev/null
+++ b/src/diffviewer/ydiff.h
@@ -0,0 +1,16 @@
+#ifndef MC__DIFFVIEW_YDIFF_H
+#define MC__DIFFVIEW_YDIFF_H
+
+/*** typedefs(not structures) and defined constants **********************************************/
+
+/*** enums ***************************************************************************************/
+
+/*** structures declarations (and typedefs of structures)*****************************************/
+
+/*** global variables defined in .c file *********************************************************/
+
+/*** declarations of public functions ************************************************************/
+
+gboolean dview_diff_cmd (const void *f0, const void *f1);
+
+#endif /* MC__DIFFVIEW_YDIFF_H */