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lightning-sunbird  0.9+nobinonly
strstr.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "plstr.h"
00039 #include <string.h>
00040 
00041 PR_IMPLEMENT(char *)
00042 PL_strstr(const char *big, const char *little)
00043 {
00044     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
00045     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
00046 
00047     return strstr(big, little);
00048 }
00049 
00050 PR_IMPLEMENT(char *)
00051 PL_strrstr(const char *big, const char *little)
00052 {
00053     const char *p;
00054     size_t ll;
00055     size_t bl;
00056 
00057     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
00058     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
00059 
00060     ll = strlen(little);
00061     bl = strlen(big);
00062     if( bl < ll ) return (char *)0;
00063     p = &big[ bl - ll ];
00064 
00065     for( ; p >= big; p-- )
00066         if( *little == *p )
00067             if( 0 == strncmp(p, little, ll) )
00068                 return (char *)p;
00069 
00070     return (char *)0;
00071 }
00072 
00073 PR_IMPLEMENT(char *)
00074 PL_strnstr(const char *big, const char *little, PRUint32 max)
00075 {
00076     size_t ll;
00077 
00078     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
00079     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
00080 
00081     ll = strlen(little);
00082     if( ll > (size_t)max ) return (char *)0;
00083     max -= (PRUint32)ll;
00084     max++;
00085 
00086     for( ; max && *big; big++, max-- )
00087         if( *little == *big )
00088             if( 0 == strncmp(big, little, ll) )
00089                 return (char *)big;
00090 
00091     return (char *)0;
00092 }
00093 
00094 PR_IMPLEMENT(char *)
00095 PL_strnrstr(const char *big, const char *little, PRUint32 max)
00096 {
00097     const char *p;
00098     size_t ll;
00099 
00100     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
00101     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
00102 
00103     ll = strlen(little);
00104 
00105     for( p = big; max && *p; p++, max-- )
00106         ;
00107 
00108     p -= ll;
00109     if( p < big ) return (char *)0;
00110 
00111     for( ; p >= big; p-- )
00112         if( *little == *p )
00113             if( 0 == strncmp(p, little, ll) )
00114                 return (char *)p;
00115 
00116     return (char *)0;
00117 }