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lightning-sunbird  0.9+nobinonly
strchr.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
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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
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00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
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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
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00024  * Alternatively, the contents of this file may be used under the terms of
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00037 
00038 #include "plstr.h"
00039 #include <string.h>
00040 
00041 PR_IMPLEMENT(char *)
00042 PL_strchr(const char *s, char c)
00043 {
00044     if( (const char *)0 == s ) return (char *)0;
00045 
00046     return strchr(s, c);
00047 }
00048 
00049 PR_IMPLEMENT(char *)
00050 PL_strrchr(const char *s, char c)
00051 {
00052     if( (const char *)0 == s ) return (char *)0;
00053 
00054     return strrchr(s, c);
00055 }
00056 
00057 PR_IMPLEMENT(char *)
00058 PL_strnchr(const char *s, char c, PRUint32 n)
00059 {
00060     if( (const char *)0 == s ) return (char *)0;
00061 
00062     for( ; n && *s; s++, n-- )
00063         if( *s == c )
00064             return (char *)s;
00065 
00066     if( ((char)0 == c) && (n > 0) && ((char)0 == *s) ) return (char *)s;
00067 
00068     return (char *)0;
00069 }
00070 
00071 PR_IMPLEMENT(char *)
00072 PL_strnrchr(const char *s, char c, PRUint32 n)
00073 {
00074     const char *p;
00075 
00076     if( (const char *)0 == s ) return (char *)0;
00077 
00078     for( p = s; n && *p; p++, n-- )
00079         ;
00080 
00081     if( ((char)0 == c) && (n > 0) && ((char)0 == *p) ) return (char *)p;
00082 
00083     for( p--; p >= s; p-- )
00084         if( *p == c )
00085             return (char *)p;
00086 
00087     return (char *)0;
00088 }