kolibrios-fun/programs/develop/libraries/kolibri-libc/source/string/strstr.c

/* strstr( const char *, const char * )

   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <string.h>

char * strstr( const char * s1, const char * s2 )
{
    const char * p1 = s1;
    const char * p2;

    while ( *s1 )
    {
        p2 = s2;

        while ( *p2 && ( *p1 == *p2 ) )
        {
            ++p1;
            ++p2;
        }

        if ( ! *p2 )
        {
            return ( char * ) s1;
        }

        ++s1;
        p1 = s1;
    }

    return NULL;
}