diff options
Diffstat (limited to 'src/procfile.c')
| -rw-r--r-- | src/procfile.c | 468 |
1 files changed, 0 insertions, 468 deletions
diff --git a/src/procfile.c b/src/procfile.c deleted file mode 100644 index 044f975b5..000000000 --- a/src/procfile.c +++ /dev/null @@ -1,468 +0,0 @@ -#include "common.h" -#include "procfile.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 -size_t procfile_max_lines = PFLINES_INCREASE_STEP; -size_t procfile_max_words = PFWORDS_INCREASE_STEP; -size_t procfile_max_allocation = PROCFILE_INCREMENT_BUFFER; - - -// ---------------------------------------------------------------------------- - -char *procfile_filename(procfile *ff) { - if(ff->filename[0]) return ff->filename; - - char buffer[FILENAME_MAX + 1]; - snprintfz(buffer, FILENAME_MAX, "/proc/self/fd/%d", ff->fd); - - ssize_t l = readlink(buffer, ff->filename, FILENAME_MAX); - if(unlikely(l == -1)) - snprintfz(ff->filename, FILENAME_MAX, "unknown filename for fd %d", ff->fd); - else - ff->filename[l] = '\0'; - - // on non-linux systems, something like this will be needed - // fcntl(ff->fd, F_GETPATH, ff->filename) - - return ff->filename; -} - -// ---------------------------------------------------------------------------- -// An array of words - -static inline void pfwords_add(procfile *ff, char *str) { - // debug(D_PROCFILE, PF_PREFIX ": adding word No %d: '%s'", fw->len, str); - - pfwords *fw = ff->words; - if(unlikely(fw->len == fw->size)) { - // debug(D_PROCFILE, PF_PREFIX ": expanding words"); - - ff->words = fw = reallocz(fw, sizeof(pfwords) + (fw->size + PFWORDS_INCREASE_STEP) * sizeof(char *)); - fw->size += PFWORDS_INCREASE_STEP; - } - - fw->words[fw->len++] = str; -} - -NEVERNULL -static inline pfwords *pfwords_new(void) { - // debug(D_PROCFILE, PF_PREFIX ": initializing words"); - - size_t size = (procfile_adaptive_initial_allocation) ? procfile_max_words : PFWORDS_INCREASE_STEP; - - pfwords *new = mallocz(sizeof(pfwords) + size * sizeof(char *)); - new->len = 0; - new->size = size; - return new; -} - -static inline void pfwords_reset(pfwords *fw) { - // debug(D_PROCFILE, PF_PREFIX ": reseting words"); - fw->len = 0; -} - -static inline void pfwords_free(pfwords *fw) { - // debug(D_PROCFILE, PF_PREFIX ": freeing words"); - - freez(fw); -} - - -// ---------------------------------------------------------------------------- -// An array of lines - -NEVERNULL -static inline size_t *pflines_add(procfile *ff) { - // debug(D_PROCFILE, PF_PREFIX ": adding line %d at word %d", fl->len, first_word); - - pflines *fl = ff->lines; - if(unlikely(fl->len == fl->size)) { - // debug(D_PROCFILE, PF_PREFIX ": expanding lines"); - - ff->lines = fl = reallocz(fl, sizeof(pflines) + (fl->size + PFLINES_INCREASE_STEP) * sizeof(ffline)); - fl->size += PFLINES_INCREASE_STEP; - } - - ffline *ffl = &fl->lines[fl->len++]; - ffl->words = 0; - ffl->first = ff->words->len; - - return &ffl->words; -} - -NEVERNULL -static inline pflines *pflines_new(void) { - // debug(D_PROCFILE, PF_PREFIX ": initializing lines"); - - size_t size = (unlikely(procfile_adaptive_initial_allocation)) ? procfile_max_words : PFLINES_INCREASE_STEP; - - pflines *new = mallocz(sizeof(pflines) + size * sizeof(ffline)); - new->len = 0; - new->size = size; - return new; -} - -static inline void pflines_reset(pflines *fl) { - // debug(D_PROCFILE, PF_PREFIX ": reseting lines"); - - fl->len = 0; -} - -static inline void pflines_free(pflines *fl) { - // debug(D_PROCFILE, PF_PREFIX ": freeing lines"); - - freez(fl); -} - - -// ---------------------------------------------------------------------------- -// The procfile - -void procfile_close(procfile *ff) { - if(unlikely(!ff)) return; - - debug(D_PROCFILE, PF_PREFIX ": Closing file '%s'", procfile_filename(ff)); - - if(likely(ff->lines)) pflines_free(ff->lines); - if(likely(ff->words)) pfwords_free(ff->words); - - if(likely(ff->fd != -1)) close(ff->fd); - freez(ff); -} - -NOINLINE -static void procfile_parser(procfile *ff) { - // debug(D_PROCFILE, PF_PREFIX ": Parsing file '%s'", ff->filename); - - char *s = ff->data // our current position - , *e = &ff->data[ff->len] // the terminating null - , *t = ff->data; // the first character of a word (or quoted / parenthesized string) - - // the look up array to find our type of character - PF_CHAR_TYPE *separators = ff->separators; - - char quote = 0; // the quote character - only when in quoted string - size_t opened = 0; // counts the number of open parenthesis - - size_t *line_words = pflines_add(ff); - - while(s < e) { - PF_CHAR_TYPE ct = separators[(unsigned char)(*s)]; - - // this is faster than a switch() - // read more here: http://lazarenko.me/switch/ - if(likely(ct == PF_CHAR_IS_WORD)) { - s++; - } - else if(likely(ct == PF_CHAR_IS_SEPARATOR)) { - if(!quote && !opened) { - if (s != t) { - // separator, but we have word before it - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - } - else { - // separator at the beginning - // skip it - t = ++s; - } - } - else { - // we are inside a quote or parenthesized string - s++; - } - } - else if(likely(ct == PF_CHAR_IS_NEWLINE)) { - // end of line - - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - - // debug(D_PROCFILE, PF_PREFIX ": ended line %d with %d words", l, ff->lines->lines[l].words); - - line_words = pflines_add(ff); - } - else if(likely(ct == 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'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - } - else - s++; - } - else if(likely(ct == PF_CHAR_IS_OPEN)) { - if(s == t) { - opened++; - t = ++s; - } - else if(opened) { - opened++; - s++; - } - else - s++; - } - else if(likely(ct == PF_CHAR_IS_CLOSE)) { - if(opened) { - opened--; - - if(!opened) { - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - t = ++s; - } - else - s++; - } - else - s++; - } - else - fatal("Internal Error: procfile_readall() does not handle all the cases."); - } - - if(likely(s > t && t < e)) { - // the last word - if(unlikely(ff->len >= ff->size)) { - // we are going to loose the last byte - s = &ff->data[ff->size - 1]; - } - - *s = '\0'; - pfwords_add(ff, t); - (*line_words)++; - // t = ++s; - } -} - -procfile *procfile_readall(procfile *ff) { - // debug(D_PROCFILE, PF_PREFIX ": Reading file '%s'.", ff->filename); - - ff->len = 0; // zero the used size - ssize_t r = 1; // read at least once - while(r > 0) { - ssize_t s = ff->len; - ssize_t x = ff->size - s; - - if(unlikely(!x)) { - debug(D_PROCFILE, PF_PREFIX ": Expanding data buffer for file '%s'.", procfile_filename(ff)); - ff = reallocz(ff, sizeof(procfile) + ff->size + PROCFILE_INCREMENT_BUFFER); - ff->size += PROCFILE_INCREMENT_BUFFER; - } - - debug(D_PROCFILE, "Reading file '%s', from position %zd with length %zd", procfile_filename(ff), s, (ssize_t)(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' on fd %d", procfile_filename(ff), ff->fd); - 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'.", procfile_filename(ff)); - procfile_close(ff); - return NULL; - } - - pflines_reset(ff->lines); - pfwords_reset(ff->words); - 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; -} - -NOINLINE -static void procfile_set_separators(procfile *ff, const char *separators) { - static PF_CHAR_TYPE def[256]; - static char initilized = 0; - - if(unlikely(!initilized)) { - // this is thread safe - // if initialized is zero, multiple threads may be executing - // this code at the same time, setting in def[] the exact same values - int i = 256; - while(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; - } - - initilized = 1; - } - - // copy the default - PF_CHAR_TYPE *ffs = ff->separators, *ffd = def, *ffe = &def[256]; - while(ffd != ffe) - *ffs++ = *ffd++; - - // set the separators - if(unlikely(!separators)) - separators = " \t=|"; - - ffs = ff->separators; - const char *s = separators; - while(*s) - ffs[(int)*s++] = PF_CHAR_IS_SEPARATOR; -} - -void procfile_set_quotes(procfile *ff, const char *quotes) { - PF_CHAR_TYPE *ffs = ff->separators; - - // remove all quotes - int i = 256; - while(i--) - if(unlikely(ffs[i] == PF_CHAR_IS_QUOTE)) - ffs[i] = PF_CHAR_IS_WORD; - - // if nothing given, return - if(unlikely(!quotes || !*quotes)) - return; - - // set the quotes - const char *s = quotes; - while(*s) - ffs[(int)*s++] = PF_CHAR_IS_QUOTE; -} - -void procfile_set_open_close(procfile *ff, const char *open, const char *close) { - PF_CHAR_TYPE *ffs = ff->separators; - - // remove all open/close - int i = 256; - while(i--) - if(unlikely(ffs[i] == PF_CHAR_IS_OPEN || ffs[i] == PF_CHAR_IS_CLOSE)) - ffs[i] = PF_CHAR_IS_WORD; - - // if nothing given, return - if(unlikely(!open || !*open || !close || !*close)) - return; - - // set the openings - const char *s = open; - while(*s) - ffs[(int)*s++] = PF_CHAR_IS_OPEN; - - // set the closings - s = close; - while(*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; - } - - // info("PROCFILE: opened '%s' on fd %d", filename, fd); - - size_t size = (unlikely(procfile_adaptive_initial_allocation)) ? procfile_max_allocation : PROCFILE_INCREMENT_BUFFER; - procfile *ff = mallocz(sizeof(procfile) + size); - - //strncpyz(ff->filename, filename, FILENAME_MAX); - ff->filename[0] = '\0'; - - ff->fd = fd; - ff->size = size; - ff->len = 0; - ff->flags = flags; - - ff->lines = pflines_new(); - ff->words = pfwords_new(); - - 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)) { - // info("PROCFILE: closing fd %d", ff->fd); - close(ff->fd); - } - - ff->fd = open(filename, O_RDONLY, 0666); - if(unlikely(ff->fd == -1)) { - procfile_close(ff); - return NULL; - } - - // info("PROCFILE: opened '%s' on fd %d", filename, ff->fd); - - //strncpyz(ff->filename, filename, FILENAME_MAX); - ff->filename[0] = '\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) { - size_t lines = procfile_lines(ff), l; - char *s; - - debug(D_PROCFILE, "File '%s' with %zu lines and %zu words", procfile_filename(ff), ff->lines->len, ff->words->len); - - for(l = 0; likely(l < lines) ;l++) { - size_t words = procfile_linewords(ff, l); - - debug(D_PROCFILE, " line %zu starts at word %zu and has %zu words", l, ff->lines->lines[l].first, ff->lines->lines[l].words); - - size_t w; - for(w = 0; likely(w < words) ;w++) { - s = procfile_lineword(ff, l, w); - debug(D_PROCFILE, " [%zu.%zu] '%s'", l, w, s); - } - } -} |