vs/getsubopt.c

   1 /**
   2  * Copyright © 2005-2020 Rich Felker, et al.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  19  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  20  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  21  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 int getsubopt(char** opt, char* const* keys, char** val)
  28 {
  29         char* s = *opt;
  30         int i;
  31
  32         *val = NULL;
  33         *opt = strchr(s, ',');
  34         if (*opt) *(*opt)++ = 0;
  35         else *opt = s + strlen(s);
  36
  37         for (i = 0; keys[i]; i++) {
  38                 size_t l = strlen(keys[i]);
  39                 if (strncmp(keys[i], s, l)) continue;
  40                 if (s[l] == '=')
  41                         *val = s + l + 1;
  42                 else if (s[l]) continue;
  43                 return i;
  44         }
  45         return -1;
  46 }