libc/unistd/getsubopt-susv3.c

   1 /*
   2  * Copyright (C) 2006 Rich Felker <dalias@aerifal.cx>
   3  *
   4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   5  */
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9
  10
  11 int getsubopt(char **opt, char *const *keys, char **val)
  12 {
  13         char *s = *opt;
  14         int i;
  15
  16         *val = NULL;
  17         *opt = strchr(s, ',');
  18         if (*opt) *(*opt)++ = 0;
  19         else *opt = s + strlen(s);
  20
  21         for (i=0; keys[i]; i++) {
  22                 size_t l = strlen(keys[i]);
  23                 if (strncmp(keys[i], s, l)) continue;
  24                 if (s[l] == '=')
  25                         *val = s + l;
  26                 else if (s[l]) continue;
  27                 return i;
  28         }
  29         return -1;
  30 }