94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: _fstrstr() implementation.
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*
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****************************************************************************/
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#include "variety.h"
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#include <stddef.h>
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#include <string.h>
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#ifdef M_I86
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#if defined(__QNX__)
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#include <i86.h>
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#else
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#include <dos.h>
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#endif
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extern int i86_memeq( const char _WCFAR *, const char _WCFAR *, int );
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#define _ZFLAG (INTR_ZF<<8)
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#pragma aux i86_memeq = \
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0x1e /* push ds */\
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0x96 /* xchg si,ax */\
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0x8e 0xd8 /* mov ds,ax */\
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0xf3 0xa6 /* rep cmpsb */\
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0x9f /* lahf */\
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0x1f /* pop ds */\
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parm caller [si ax] [es di] [cx]\
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value [ax] \
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modify exact [si di cx ax];
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#define memeq( p1, p2, len ) ( i86_memeq((p1),(p2),(len)) & _ZFLAG )
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#else
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#define memeq( p1, p2, len ) ( _fmemcmp((p1),(p2),(len)) == 0 )
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#endif
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/* Locate the first occurrence of the string pointed to by s2 in the
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string pointed to by s1.
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The strstr function returns a pointer to the located string, or a
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null pointer if the string is not found.
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*/
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_WCRTLINK char _WCFAR *_fstrstr( const char _WCFAR *s1, const char _WCFAR *s2 )
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{
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char _WCFAR *end_of_s1;
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size_t s1len, s2len;
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if( s2[0] == '\0' ) {
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return( (char _WCFAR *)s1 );
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} else if( s2[1] == '\0' ) {
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return( _fstrchr( s1, s2[0] ) );
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}
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end_of_s1 = _fmemchr( s1, '\0', ~0u );
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s2len = _fstrlen( s2 );
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for(;;) {
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s1len = end_of_s1 - s1;
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if( s1len < s2len ) break;
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s1 = _fmemchr( s1, *s2, s1len ); /* find start of possible match */
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if( s1 == NULL ) break;
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if( memeq( s1, s2, s2len ) ) return( (char _WCFAR *)s1 );
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++s1;
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}
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return( NULL );
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}
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