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authorDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:22:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:22:44 +0000
commit1e6c93250172946eeb38e94a92a1fd12c9d3011e (patch)
tree8ca5e16dfc7ad6b3bf2738ca0a48408a950f8f7e /libnetdata/procfile/procfile.h
parentUpdate watch file (diff)
downloadnetdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.tar.xz
netdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.zip
Merging upstream version 1.11.0+dfsg.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libnetdata/procfile/procfile.h')
-rw-r--r--libnetdata/procfile/procfile.h106
1 files changed, 106 insertions, 0 deletions
diff --git a/libnetdata/procfile/procfile.h b/libnetdata/procfile/procfile.h
new file mode 100644
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+++ b/libnetdata/procfile/procfile.h
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+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_PROCFILE_H
+#define NETDATA_PROCFILE_H 1
+
+#include "../libnetdata.h"
+
+// ----------------------------------------------------------------------------
+// An array of words
+
+typedef struct {
+ size_t len; // used entries
+ size_t size; // capacity
+ char *words[]; // array of pointers
+} pfwords;
+
+
+// ----------------------------------------------------------------------------
+// An array of lines
+
+typedef struct {
+ size_t words; // how many words this line has
+ size_t first; // the id of the first word of this line
+ // in the words array
+} ffline;
+
+typedef struct {
+ size_t len; // used entries
+ size_t size; // capacity
+ ffline lines[]; // array of lines
+} pflines;
+
+
+// ----------------------------------------------------------------------------
+// The procfile
+
+#define PROCFILE_FLAG_DEFAULT 0x00000000
+#define PROCFILE_FLAG_NO_ERROR_ON_FILE_IO 0x00000001
+
+typedef enum procfile_separator {
+ PF_CHAR_IS_SEPARATOR,
+ PF_CHAR_IS_NEWLINE,
+ PF_CHAR_IS_WORD,
+ PF_CHAR_IS_QUOTE,
+ PF_CHAR_IS_OPEN,
+ PF_CHAR_IS_CLOSE
+} PF_CHAR_TYPE;
+
+typedef struct {
+ char filename[FILENAME_MAX + 1]; // not populated until profile_filename() is called
+
+ uint32_t flags;
+ int fd; // the file desriptor
+ size_t len; // the bytes we have placed into data
+ size_t size; // the bytes we have allocated for data
+ pflines *lines;
+ pfwords *words;
+ PF_CHAR_TYPE separators[256];
+ char data[]; // allocated buffer to keep file contents
+} procfile;
+
+// close the proc file and free all related memory
+extern void procfile_close(procfile *ff);
+
+// (re)read and parse the proc file
+extern procfile *procfile_readall(procfile *ff);
+
+// open a /proc or /sys file
+extern procfile *procfile_open(const char *filename, const char *separators, uint32_t flags);
+
+// re-open a file
+// if separators == NULL, the last separators are used
+extern procfile *procfile_reopen(procfile *ff, const char *filename, const char *separators, uint32_t flags);
+
+// example walk-through a procfile parsed file
+extern void procfile_print(procfile *ff);
+
+extern void procfile_set_quotes(procfile *ff, const char *quotes);
+extern void procfile_set_open_close(procfile *ff, const char *open, const char *close);
+
+extern char *procfile_filename(procfile *ff);
+
+// ----------------------------------------------------------------------------
+
+// set to the O_XXXX flags, to have procfile_open and procfile_reopen use them when opening proc files
+extern int procfile_open_flags;
+
+// set this to 1, to have procfile adapt its initial buffer allocation to the max allocation used so far
+extern int procfile_adaptive_initial_allocation;
+
+// return the number of lines present
+#define procfile_lines(ff) ((ff)->lines->len)
+
+// return the number of words of the Nth line
+#define procfile_linewords(ff, line) (((line) < procfile_lines(ff)) ? (ff)->lines->lines[(line)].words : 0)
+
+// return the Nth word of the file, or empty string
+#define procfile_word(ff, word) (((word) < (ff)->words->len) ? (ff)->words->words[(word)] : "")
+
+// return the first word of the Nth line, or empty string
+#define procfile_line(ff, line) (((line) < procfile_lines(ff)) ? procfile_word((ff), (ff)->lines->lines[(line)].first) : "")
+
+// return the Nth word of the current line
+#define procfile_lineword(ff, line, word) (((line) < procfile_lines(ff) && (word) < procfile_linewords((ff), (line))) ? procfile_word((ff), (ff)->lines->lines[(line)].first + (word)) : "")
+
+#endif /* NETDATA_PROCFILE_H */