/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 * 
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 * 
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#include "plstr.h"

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;
}

PR_IMPLEMENT(char *)
PL_strrstr(const char *big, const char *little)
{
    const char *p;
    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);
    p = &big[ PL_strlen(big) - ll ];
    if( p < big ) return (char *)0;

    for( ; p >= big; p-- )
        if( *little == *p )
            if( 0 == PL_strncmp(p, little, ll) )
                return (char *)p;

    return (char *)0;
}

PR_IMPLEMENT(char *)
PL_strnstr(const char *big, const char *little, PRUint32 max)
{
    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);
    if( ll > max ) return (char *)0;
    max -= ll;
    max++;

    for( ; *big && max; big++, max-- )
        if( *little == *big )
            if( 0 == PL_strncmp(big, little, ll) )
                return (char *)big;

    return (char *)0;
}

PR_IMPLEMENT(char *)
PL_strnrstr(const char *big, const char *little, PRUint32 max)
{
    const char *p;
    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( p = big; *p && max; p++, max-- )
        ;

    p -= ll;
    if( p < big ) return (char *)0;

    for( ; p >= big; p-- )
        if( *little == *p )
            if( 0 == PL_strncmp(p, little, ll) )
                return (char *)p;

    return (char *)0;
}
