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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 __attribute__ ((__packed__)) 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 procfile {
char *filename; // not populated until procfile_filename() is called
uint32_t flags;
int fd; // the file descriptor
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
void procfile_close(procfile *ff);
// (re)read and parse the proc file
procfile *procfile_readall(procfile *ff);
// open a /proc or /sys file
procfile *procfile_open(const char *filename, const char *separators, uint32_t flags);
// re-open a file
// if separators == NULL, the last separators are used
procfile *procfile_reopen(procfile *ff, const char *filename, const char *separators, uint32_t flags);
// example walk-through a procfile parsed file
void procfile_print(procfile *ff);
void procfile_set_quotes(procfile *ff, const char *quotes);
void procfile_set_open_close(procfile *ff, const char *open, const char *close);
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)) : "")
// Open file without logging file IO error if any
#define procfile_open_no_log(filename, separators, flags) procfile_open(filename, separators, flags | PROCFILE_FLAG_NO_ERROR_ON_FILE_IO)
#endif /* NETDATA_PROCFILE_H */
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