forked from KolibriOS/kolibrios
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/****************************************************************************
|
|
*
|
|
* 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: _fstrstr() implementation.
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
#include "variety.h"
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
|
|
#ifdef M_I86
|
|
#if defined(__QNX__)
|
|
#include <i86.h>
|
|
#else
|
|
#include <dos.h>
|
|
#endif
|
|
|
|
extern int i86_memeq( const char _WCFAR *, const char _WCFAR *, int );
|
|
|
|
#define _ZFLAG (INTR_ZF<<8)
|
|
|
|
#pragma aux i86_memeq = \
|
|
0x1e /* push ds */\
|
|
0x96 /* xchg si,ax */\
|
|
0x8e 0xd8 /* mov ds,ax */\
|
|
0xf3 0xa6 /* rep cmpsb */\
|
|
0x9f /* lahf */\
|
|
0x1f /* pop ds */\
|
|
parm caller [si ax] [es di] [cx]\
|
|
value [ax] \
|
|
modify exact [si di cx ax];
|
|
|
|
#define memeq( p1, p2, len ) ( i86_memeq((p1),(p2),(len)) & _ZFLAG )
|
|
|
|
#else
|
|
|
|
#define memeq( p1, p2, len ) ( _fmemcmp((p1),(p2),(len)) == 0 )
|
|
|
|
#endif
|
|
|
|
/* Locate the first occurrence of the string pointed to by s2 in the
|
|
string pointed to by s1.
|
|
The strstr function returns a pointer to the located string, or a
|
|
null pointer if the string is not found.
|
|
*/
|
|
|
|
_WCRTLINK char _WCFAR *_fstrstr( const char _WCFAR *s1, const char _WCFAR *s2 )
|
|
{
|
|
char _WCFAR *end_of_s1;
|
|
size_t s1len, s2len;
|
|
|
|
if( s2[0] == '\0' ) {
|
|
return( (char _WCFAR *)s1 );
|
|
} else if( s2[1] == '\0' ) {
|
|
return( _fstrchr( s1, s2[0] ) );
|
|
}
|
|
end_of_s1 = _fmemchr( s1, '\0', ~0u );
|
|
s2len = _fstrlen( s2 );
|
|
for(;;) {
|
|
s1len = end_of_s1 - s1;
|
|
if( s1len < s2len ) break;
|
|
s1 = _fmemchr( s1, *s2, s1len ); /* find start of possible match */
|
|
if( s1 == NULL ) break;
|
|
if( memeq( s1, s2, s2len ) ) return( (char _WCFAR *)s1 );
|
|
++s1;
|
|
}
|
|
return( NULL );
|
|
}
|