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kolibrios/programs/develop/open watcom/trunk/clib/string/fstrncat.c
Sergey Semyonov (Serge) 836c97f0ac Clib string & memory functions
git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-06-26 00:54:22 +00:00

87 lines
3.0 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: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
* DESCRIBE IT HERE!
*
****************************************************************************/
#include "variety.h"
#include <string.h>
#ifdef M_I86
extern char _WCFAR *_fast_strncat( char _WCFAR *, const char _WCFAR *, size_t );
#pragma aux _fast_strncat = \
0x1e /* push ds */\
0x96 /* xchg si,ax */\
0x8e 0xd8 /* mov ds,ax */\
0x57 /* push di */\
0xb9 0xff 0xff /* mov cx,ffffh */\
0x31 0xc0 /* xor ax,ax */\
0xf2 0xae /* repne scasb */\
0x4f /* dec di */\
0x89 0xd1 /* mov cx,dx */\
0xac /* L1: lodsb */\
0xaa /* stosb */\
0x84 0xc0 /* test al,al */\
0xe0 0xfa /* loopne L1 */\
0x74 0x03 /* je L2 */\
0x26 0x88 0x25 /* mov es:[di],ah */\
0x58 /* L2: pop ax */\
0x1f /* pop ds */\
parm caller [es di] [si ax] [dx]\
value [es ax] \
modify exact [ax cx si di];
#endif
/* concatenate t to the end of dst */
_WCRTLINK char _WCFAR *_fstrncat( char _WCFAR *dst, const char _WCFAR *t, size_t n )
{
#ifdef M_I86
if( n ) {
return( _fast_strncat( dst, t, n ) );
}
return( dst );
#else
char _WCFAR *s;
s = _fmemchr( dst, '\0', ~0 );
while( n != 0 ) {
*s = *t;
if( *s == '\0' ) break;
++s;
++t;
--n;
}
*s = '\0';
return( dst );
#endif
}