Subversion Repositories planix.SVN

#include <string.h>

/* Return pointer to first occurrence of s2 in s1, NULL if none */

char *
strstr(const char *s1, const char *s2)
{
        char *p, *pa, *pb;
        int c0, c;

        c0 = *s2;
        if(c0 == 0)
                return (char *)s1;
        s2++;
        for(p=strchr(s1, c0); p; p=strchr(p+1, c0)) {
                pa = p;
                for(pb=(char *)s2;; pb++) {
                        c = *pb;
                        if(c == 0)
                                return p;
                        if(c != *++pa)
                                break;
                }
        }
        return 0;
}