PL_strstr(const char *big, const char *little)
PL_strnrstr(const char *big, const char *little, PRUint32 max)
PR_IMPLEMENT(char *)PL_strstr(const char *big, const char *little){    PRUint32 ll;    if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;    if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;    ll = PL_strlen(little);    for( ; *big; big++ )        if( *little == *big )            if( 0 == PL_strncmp(big, little, ll) )                return (char *)big;    return (char *)0;}