#ifndef HAVE_STRCSPN
/*
 * strcspn - find length of initial segment of s1 consisting entirely
 * of characters not from s2
 */

	static size_t
strcspn(s1, s2)
	const char_u		   *s1;
	const char_u		   *s2;
{
	register char_u  *scan1;
	register char_u  *scan2;
	register int	count;

	count = 0;
	for (scan1 = s1; *scan1 != '\0'; scan1++) {
		for (scan2 = s2; *scan2 != '\0';)		/* ++ moved down. */
			if (*scan1 == *scan2++)
				return count;
		count++;
	}
	return count;
}
#endif