Subversion Repositories planix.SVN

#include <u.h>

#include <libc.h>

/*

 * Return pointer to first occurrence of s2 in s1,

 * 0 if none

 */

char*

strstr(char *s1, char *s2)

{

	char *p, *pa, *pb;

	int c0, c;

	c0 = *s2;

	if(c0 == 0)

		return s1;

	s2++;

	for(p=strchr(s1, c0); p; p=strchr(p+1, c0)) {

		pa = p;

		for(pb=s2;; pb++) {

			c = *pb;

			if(c == 0)

				return p;

			if(c != *++pa)

				break;

		}

	}

	return 0;

}