#include <string.h>

char *strstr(CONST char *s1, CONST char *s2)
	{
	int i = strlen(s1);
	int j = strlen(s2);

	for ( ; i && i >= j; s1++, i--)
		if (strncmp(s1, s2, j) == 0)
			return (char *)s1;
	return 0;
	}