src/passwd/getgrent_a.c

   1 #include "pwf.h"
   2 #include <pthread.h>
   3
   4 static unsigned atou(char **s)
   5 {
   6         unsigned x;
   7         for (x=0; **s-'0'<10U; ++*s) x=10*x+(**s-'0');
   8         return x;
   9 }
  10
  11 int __getgrent_a(FILE *f, struct group *gr, char **line, size_t *size, char ***mem, size_t *nmem, struct group **res)
  12 {
  13         ssize_t l;
  14         char *s, *mems;
  15         size_t i;
  16         int rv = 0;
  17         int cs;
  18         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
  19         for (;;) {
  20                 if ((l=getline(line, size, f)) < 0) {
  21                         rv = ferror(f) ? errno : 0;
  22                         free(*line);
  23                         *line = 0;
  24                         gr = 0;
  25                         goto end;
  26                 }
  27                 line[0][l-1] = 0;
  28
  29                 s = line[0];
  30                 gr->gr_name = s++;
  31                 if (!(s = strchr(s, ':'))) continue;
  32
  33                 *s++ = 0; gr->gr_passwd = s;
  34                 if (!(s = strchr(s, ':'))) continue;
  35
  36                 *s++ = 0; gr->gr_gid = atou(&s);
  37                 if (*s != ':') continue;
  38
  39                 *s++ = 0; mems = s;
  40                 break;
  41         }
  42
  43         for (*nmem=!!*s; *s; s++)
  44                 if (*s==',') ++*nmem;
  45         free(*mem);
  46         *mem = calloc(sizeof(char *), *nmem+1);
  47         if (!*mem) {
  48                 rv = errno;
  49                 free(*line);
  50                 *line = 0;
  51                 gr = 0;
  52                 goto end;
  53         }
  54         if (*mems) {
  55                 mem[0][0] = mems;
  56                 for (s=mems, i=0; *s; s++)
  57                         if (*s==',') *s++ = 0, mem[0][++i] = s;
  58                 mem[0][++i] = 0;
  59         } else {
  60                 mem[0][0] = 0;
  61         }
  62         gr->gr_mem = *mem;
  63 end:
  64         pthread_setcancelstate(cs, 0);
  65         *res = gr;
  66         if(rv) errno = rv;
  67         return rv;
  68 }