83 lines
2.9 KiB
C
83 lines
2.9 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: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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* DESCRIBE IT HERE!
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*
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****************************************************************************/
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#include "variety.h"
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#include <string.h>
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#ifdef M_I86
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extern char _WCFAR *fast_strncpy( char _WCFAR *, const char _WCFAR *, size_t );
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#pragma aux fast_strncpy = \
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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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0x57 /* push di */\
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0xac /* L1: lodsb */\
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0xaa /* stosb */\
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0x84 0xc0 /* test al,al */\
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0xe0 0xfa /* loopne L1 */\
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0x31 0xc0 /* xor ax,ax */\
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0xd1 0xe9 /* shr cx,1 */\
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0xf3 0xab /* rep stosw */\
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0x11 0xc9 /* adc cx,cx */\
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0xf3 0xaa /* rep stosb */\
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0x58 /* pop ax */\
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0x1f /* pop ds */\
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parm caller [es di] [si ax] [cx]\
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value [es ax] \
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modify exact [ax cx si di];
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#endif
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_WCRTLINK char _WCFAR *_fstrncpy( char _WCFAR *dst, const char _WCFAR *src, size_t len )
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{
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#ifdef M_I86
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if( len ) {
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return( fast_strncpy( dst, src, len ) );
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}
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return( dst );
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#else
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char _WCFAR *ret;
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ret = dst;
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for(;len; --len ) {
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if( *src == '\0' ) break;
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*dst++ = *src++;
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}
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while( len != 0 ) {
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*dst++ = '\0'; /* pad destination string with null chars */
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--len;
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}
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return( ret );
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#endif
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}
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