int
strspn(string, in)
	char *string;
	char *in;
{
	register char *s1, *s2;

	for (s1 = string; *s1; s1++) {
		for (s2 = in; *s2 && *s2 != *s1; s2++) /* nothing */ ;
		if (! *s2) break;
	}
	return s1 - string;
}