1#include <stdlib.h>
 2#include <string.h>
 3
 4int getsubopt(char **opt, char *const *keys, char **val)
 5{
 6	char *s = *opt;
 7	int i;
 8
 9	*val = NULL;
10	*opt = strchr(s, ',');
11	if (*opt) *(*opt)++ = 0;
12	else *opt = s + strlen(s);
13
14	for (i=0; keys[i]; i++) {
15		size_t l = strlen(keys[i]);
16		if (strncmp(keys[i], s, l)) continue;
17		if (s[l] == '=')
18			*val = s + l + 1;
19		else if (s[l]) continue;
20		return i;
21	}
22	return -1;
23}