github.com/afumu/libc@v0.0.6/musl/src/misc/getsubopt.c (about)

     1  #include <stdlib.h>
     2  #include <string.h>
     3  
     4  int 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  }