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Copy pathprocfile.c
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Copy pathprocfile.c
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513 lines (395 loc) · 12.1 KB
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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <malloc.h>
#include <ctype.h>
#include <time.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "common.h"
#include "log.h"
#include "procfile.h"
#include "../config.h"
#define PF_PREFIX "PROCFILE"
#define PFWORDS_INCREASE_STEP 200
#define PFLINES_INCREASE_STEP 10
#define PROCFILE_INCREMENT_BUFFER 512
int procfile_adaptive_initial_allocation = 0;
// if adaptive allocation is set, these store the
// max values we have seen so far
uint32_t procfile_max_lines = PFLINES_INCREASE_STEP;
uint32_t procfile_max_words = PFWORDS_INCREASE_STEP;
size_t procfile_max_allocation = PROCFILE_INCREMENT_BUFFER;
// ----------------------------------------------------------------------------
// An array of words
pfwords *pfwords_add(pfwords *fw, char *str) {
// debug(D_PROCFILE, PF_PREFIX ": adding word No %d: '%s'", fw->len, str);
if(unlikely(fw->len == fw->size)) {
// debug(D_PROCFILE, PF_PREFIX ": expanding words");
pfwords *new = realloc(fw, sizeof(pfwords) + (fw->size + PFWORDS_INCREASE_STEP) * sizeof(char *));
if(unlikely(!new)) {
error(PF_PREFIX ": failed to expand words");
free(fw);
return NULL;
}
fw = new;
fw->size += PFWORDS_INCREASE_STEP;
}
fw->words[fw->len++] = str;
return fw;
}
pfwords *pfwords_new(void) {
// debug(D_PROCFILE, PF_PREFIX ": initializing words");
uint32_t size = (procfile_adaptive_initial_allocation) ? procfile_max_words : PFWORDS_INCREASE_STEP;
pfwords *new = malloc(sizeof(pfwords) + size * sizeof(char *));
if(unlikely(!new)) return NULL;
new->len = 0;
new->size = size;
return new;
}
void pfwords_reset(pfwords *fw) {
// debug(D_PROCFILE, PF_PREFIX ": reseting words");
fw->len = 0;
}
void pfwords_free(pfwords *fw) {
// debug(D_PROCFILE, PF_PREFIX ": freeing words");
free(fw);
}
// ----------------------------------------------------------------------------
// An array of lines
pflines *pflines_add(pflines *fl, uint32_t first_word) {
// debug(D_PROCFILE, PF_PREFIX ": adding line %d at word %d", fl->len, first_word);
if(unlikely(fl->len == fl->size)) {
// debug(D_PROCFILE, PF_PREFIX ": expanding lines");
pflines *new = realloc(fl, sizeof(pflines) + (fl->size + PFLINES_INCREASE_STEP) * sizeof(ffline));
if(unlikely(!new)) {
error(PF_PREFIX ": failed to expand lines");
free(fl);
return NULL;
}
fl = new;
fl->size += PFLINES_INCREASE_STEP;
}
fl->lines[fl->len].words = 0;
fl->lines[fl->len++].first = first_word;
return fl;
}
pflines *pflines_new(void) {
// debug(D_PROCFILE, PF_PREFIX ": initializing lines");
uint32_t size = (unlikely(procfile_adaptive_initial_allocation)) ? procfile_max_words : PFLINES_INCREASE_STEP;
pflines *new = malloc(sizeof(pflines) + size * sizeof(ffline));
if(unlikely(!new)) return NULL;
new->len = 0;
new->size = size;
return new;
}
void pflines_reset(pflines *fl) {
// debug(D_PROCFILE, PF_PREFIX ": reseting lines");
fl->len = 0;
}
void pflines_free(pflines *fl) {
// debug(D_PROCFILE, PF_PREFIX ": freeing lines");
free(fl);
}
// ----------------------------------------------------------------------------
// The procfile
#define PF_CHAR_IS_SEPARATOR ' '
#define PF_CHAR_IS_NEWLINE 'N'
#define PF_CHAR_IS_WORD 'W'
#define PF_CHAR_IS_QUOTE 'Q'
#define PF_CHAR_IS_OPEN 'O'
#define PF_CHAR_IS_CLOSE 'C'
void procfile_close(procfile *ff) {
debug(D_PROCFILE, PF_PREFIX ": Closing file '%s'", ff->filename);
if(likely(ff->lines)) pflines_free(ff->lines);
if(likely(ff->words)) pfwords_free(ff->words);
if(likely(ff->fd != -1)) close(ff->fd);
free(ff);
}
procfile *procfile_parser(procfile *ff) {
debug(D_PROCFILE, PF_PREFIX ": Parsing file '%s'", ff->filename);
char *s = ff->data, *e = &ff->data[ff->len], *t = ff->data, quote = 0;
uint32_t l = 0, w = 0;
int opened = 0;
ff->lines = pflines_add(ff->lines, w);
if(unlikely(!ff->lines)) goto cleanup;
while(likely(s < e)) {
// we are not at the end
switch(ff->separators[(int)(*s)]) {
case PF_CHAR_IS_OPEN:
if(s == t) {
opened++;
t = ++s;
}
else if(opened) {
opened++;
s++;
}
else
s++;
continue;
case PF_CHAR_IS_CLOSE:
if(opened) {
opened--;
if(!opened) {
*s = '\0';
ff->words = pfwords_add(ff->words, t);
if(unlikely(!ff->words)) goto cleanup;
ff->lines->lines[l].words++;
w++;
t = ++s;
}
else
s++;
}
else
s++;
continue;
case PF_CHAR_IS_QUOTE:
if(unlikely(!quote && s == t)) {
// quote opened at the beginning
quote = *s;
t = ++s;
}
else if(unlikely(quote && quote == *s)) {
// quote closed
quote = 0;
*s = '\0';
ff->words = pfwords_add(ff->words, t);
if(unlikely(!ff->words)) goto cleanup;
ff->lines->lines[l].words++;
w++;
t = ++s;
}
else
s++;
continue;
case PF_CHAR_IS_SEPARATOR:
if(unlikely(quote || opened)) {
// we are inside a quote
s++;
continue;
}
if(unlikely(s == t)) {
// skip all leading white spaces
t = ++s;
continue;
}
// end of word
*s = '\0';
ff->words = pfwords_add(ff->words, t);
if(unlikely(!ff->words)) goto cleanup;
ff->lines->lines[l].words++;
w++;
t = ++s;
continue;
case PF_CHAR_IS_NEWLINE:
// end of line
*s = '\0';
ff->words = pfwords_add(ff->words, t);
if(unlikely(!ff->words)) goto cleanup;
ff->lines->lines[l].words++;
w++;
// debug(D_PROCFILE, PF_PREFIX ": ended line %d with %d words", l, ff->lines->lines[l].words);
ff->lines = pflines_add(ff->lines, w);
if(unlikely(!ff->lines)) goto cleanup;
l++;
t = ++s;
continue;
default:
s++;
continue;
}
}
if(likely(s > t && t < e)) {
// the last word
if(likely(ff->len < ff->size))
*s = '\0';
else {
// we are going to loose the last byte
ff->data[ff->size - 1] = '\0';
}
ff->words = pfwords_add(ff->words, t);
if(unlikely(!ff->words)) goto cleanup;
ff->lines->lines[l].words++;
w++;
}
return ff;
cleanup:
error(PF_PREFIX ": Failed to parse file '%s'", ff->filename);
procfile_close(ff);
return NULL;
}
procfile *procfile_readall(procfile *ff) {
debug(D_PROCFILE, PF_PREFIX ": Reading file '%s'.", ff->filename);
ssize_t s, r = 1, x;
ff->len = 0;
while(likely(r > 0)) {
s = ff->len;
x = ff->size - s;
if(!x) {
debug(D_PROCFILE, PF_PREFIX ": Expanding data buffer for file '%s'.", ff->filename);
procfile *new = realloc(ff, sizeof(procfile) + ff->size + PROCFILE_INCREMENT_BUFFER);
if(unlikely(!new)) {
error(PF_PREFIX ": Cannot allocate memory for file '%s'", ff->filename);
procfile_close(ff);
return NULL;
}
ff = new;
ff->size += PROCFILE_INCREMENT_BUFFER;
}
debug(D_PROCFILE, "Reading file '%s', from position %ld with length %ld", ff->filename, s, ff->size - s);
r = read(ff->fd, &ff->data[s], ff->size - s);
if(unlikely(r == -1)) {
if(unlikely(!(ff->flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot read from file '%s'", ff->filename);
procfile_close(ff);
return NULL;
}
ff->len += r;
}
debug(D_PROCFILE, "Rewinding file '%s'", ff->filename);
if(unlikely(lseek(ff->fd, 0, SEEK_SET) == -1)) {
if(unlikely(!(ff->flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot rewind on file '%s'.", ff->filename);
procfile_close(ff);
return NULL;
}
pflines_reset(ff->lines);
pfwords_reset(ff->words);
ff = procfile_parser(ff);
if(unlikely(procfile_adaptive_initial_allocation)) {
if(unlikely(ff->len > procfile_max_allocation)) procfile_max_allocation = ff->len;
if(unlikely(ff->lines->len > procfile_max_lines)) procfile_max_lines = ff->lines->len;
if(unlikely(ff->words->len > procfile_max_words)) procfile_max_words = ff->words->len;
}
debug(D_PROCFILE, "File '%s' updated.", ff->filename);
return ff;
}
static void procfile_set_separators(procfile *ff, const char *separators) {
static char def[256] = { [0 ... 255] = 0 };
int i;
if(unlikely(!def[255])) {
// this is thread safe
// we check that the last byte is non-zero
// if it is zero, multiple threads may be executing this at the same time
// setting in def[] the exact same values
for(i = 0; likely(i < 256) ;i++) {
if(unlikely(i == '\n' || i == '\r')) def[i] = PF_CHAR_IS_NEWLINE;
else if(unlikely(isspace(i) || !isprint(i))) def[i] = PF_CHAR_IS_SEPARATOR;
else def[i] = PF_CHAR_IS_WORD;
}
}
// copy the default
char *ffs = ff->separators, *ffd = def, *ffe = &def[256];
while(likely(ffd != ffe)) *ffs++ = *ffd++;
// set the separators
if(unlikely(!separators))
separators = " \t=|";
ffs = ff->separators;
const char *s = separators;
while(likely(*s))
ffs[(int)*s++] = PF_CHAR_IS_SEPARATOR;
}
void procfile_set_quotes(procfile *ff, const char *quotes) {
// remove all quotes
int i;
for(i = 0; i < 256 ; i++)
if(ff->separators[i] == PF_CHAR_IS_QUOTE)
ff->separators[i] = PF_CHAR_IS_WORD;
// if nothing given, return
if(unlikely(!quotes || !*quotes))
return;
// set the quotes
char *ffs = ff->separators;
const char *s = quotes;
while(likely(*s))
ffs[(int)*s++] = PF_CHAR_IS_QUOTE;
}
void procfile_set_open_close(procfile *ff, const char *open, const char *close) {
// remove all open/close
int i;
for(i = 0; i < 256 ; i++)
if(ff->separators[i] == PF_CHAR_IS_OPEN || ff->separators[i] == PF_CHAR_IS_CLOSE)
ff->separators[i] = PF_CHAR_IS_WORD;
// if nothing given, return
if(unlikely(!open || !*open || !close || !*close))
return;
// set the openings
char *ffs = ff->separators;
const char *s = open;
while(likely(*s))
ffs[(int)*s++] = PF_CHAR_IS_OPEN;
s = close;
while(likely(*s))
ffs[(int)*s++] = PF_CHAR_IS_CLOSE;
}
procfile *procfile_open(const char *filename, const char *separators, uint32_t flags) {
debug(D_PROCFILE, PF_PREFIX ": Opening file '%s'", filename);
int fd = open(filename, O_RDONLY, 0666);
if(unlikely(fd == -1)) {
if(unlikely(!(flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot open file '%s'", filename);
return NULL;
}
size_t size = (unlikely(procfile_adaptive_initial_allocation)) ? procfile_max_allocation : PROCFILE_INCREMENT_BUFFER;
procfile *ff = malloc(sizeof(procfile) + size);
if(unlikely(!ff)) {
error(PF_PREFIX ": Cannot allocate memory for file '%s'", filename);
close(fd);
return NULL;
}
strncpy(ff->filename, filename, FILENAME_MAX);
ff->filename[FILENAME_MAX] = '\0';
ff->fd = fd;
ff->size = size;
ff->len = 0;
ff->flags = flags;
ff->lines = pflines_new();
ff->words = pfwords_new();
if(unlikely(!ff->lines || !ff->words)) {
error(PF_PREFIX ": Cannot initialize parser for file '%s'", filename);
procfile_close(ff);
return NULL;
}
procfile_set_separators(ff, separators);
debug(D_PROCFILE, "File '%s' opened.", filename);
return ff;
}
procfile *procfile_reopen(procfile *ff, const char *filename, const char *separators, uint32_t flags) {
if(unlikely(!ff)) return procfile_open(filename, separators, flags);
if(likely(ff->fd != -1)) close(ff->fd);
ff->fd = open(filename, O_RDONLY, 0666);
if(unlikely(ff->fd == -1)) {
procfile_close(ff);
return NULL;
}
strncpy(ff->filename, filename, FILENAME_MAX);
ff->filename[FILENAME_MAX] = '\0';
ff->flags = flags;
// do not do the separators again if NULL is given
if(likely(separators)) procfile_set_separators(ff, separators);
return ff;
}
// ----------------------------------------------------------------------------
// example parsing of procfile data
void procfile_print(procfile *ff) {
uint32_t lines = procfile_lines(ff), l;
uint32_t words, w;
char *s;
debug(D_PROCFILE, "File '%s' with %d lines and %d words", ff->filename, ff->lines->len, ff->words->len);
for(l = 0; likely(l < lines) ;l++) {
words = procfile_linewords(ff, l);
debug(D_PROCFILE, " line %d starts at word %d and has %d words", l, ff->lines->lines[l].first, ff->lines->lines[l].words);
for(w = 0; likely(w < words) ;w++) {
s = procfile_lineword(ff, l, w);
debug(D_PROCFILE, " [%d.%d] '%s'", l, w, s);
}
}
}
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