kolibrios/programs/develop/open watcom/trunk/clib/string/strrchr.c

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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: Implementation of strchr() and wcsrchr().
*
****************************************************************************/
#include "variety.h"
#include "widechar.h"
#include <stddef.h>
#include <string.h>
#include "riscstr.h"
#if defined(M_I86) && !defined(__WIDECHAR__)
extern char *_fast_strrchr( const char _WCFAR *, char );
#if defined(__SMALL_DATA__)
#pragma aux _fast_strrchr = \
0xb9 0xff 0xff /* mov cx,ffffh */ \
0x30 0xc0 /* xor al,al */ \
0xf2 0xae /* repne scasb */ \
0xf7 0xd1 /* not cx */ \
0x4f /* dec di */ \
0x88 0xd0 /* mov al,dl */ \
0xfd /* std */ \
0xf2 0xae /* repne scasb */ \
0xfc /* cld */ \
0x75 0x03 /* jne L1 */ \
0x89 0xf9 /* mov cx,di */ \
0x41 /* inc cx */ \
/* L1: */ \
parm caller [es di] [dl] \
value [cx] \
modify exact [cx ax di];
#else
#pragma aux _fast_strrchr = \
0xb9 0xff 0xff /* mov cx,ffffh */ \
0x30 0xc0 /* xor al,al */ \
0xf2 0xae /* repne scasb */ \
0xf7 0xd1 /* not cx */ \
0x4f /* dec di */ \
0x88 0xd8 /* mov al,bl */ \
0xfd /* std */ \
0xf2 0xae /* repne scasb */ \
0xfc /* cld */ \
0x75 0x04 /* jne L1 */ \
0x89 0xf9 /* mov cx,di */ \
0x41 /* inc cx */ \
0xa9 /* hide 2 bytes */ \
0x8e 0xc1 /* L1: mov es,cx */ \
parm caller [es di] [bl] \
value [es cx] \
modify exact [es cx ax di];
#endif
#endif
/* Locate the last occurrence of c in the string pointed to by s.
The terminating null character is considered to be part of the string.
If the character c is not found, NULL is returned.
*/
#if defined(__RISCSTR__) && defined(__WIDECHAR__)
_WCRTLINK CHAR_TYPE *__simple_wcsrchr( const CHAR_TYPE *s, INTCHAR_TYPE c )
#else
_WCRTLINK CHAR_TYPE *__F_NAME(strrchr,wcsrchr)( const CHAR_TYPE *s, INTCHAR_TYPE c )
#endif
{
#if defined(M_I86) && !defined(__WIDECHAR__)
return( _fast_strrchr( s, c ) );
#else
CHAR_TYPE *p;
CHAR_TYPE cc = c;
p = NULL; /* assume c will not be found */
do {
if( *s == cc ) p = (CHAR_TYPE *)s;
} while( *s++ != NULLCHAR );
return( p );
#endif
}