/*
 * strcasestr() - Case insensitive search for string b
 * inside of string a.
 *
 * Dan Cross <net!gajendra!cross>
 */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>

char *
strcasestr(char *a, char *b)
{
	size_t l;
	char t[3];

	t[0] = tolower(*b);
	t[1] = toupper(*b);
	t[2] = '\0';
	for (l = strcspn(a, t); l != strlen(a); l += strcspn(a + l, t)) {
		if (strncasecmp(a + l, b, strlen(b)) == 0) {
			return(a + l);
		}
		l++;
	}
	return(NULL);
}