168 lines
5.8 KiB
C
168 lines
5.8 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: Implementation of memmove().
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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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#if defined(__386__)
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extern void movefwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
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#pragma aux movefwd = \
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0x06 /* push es */\
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0x8e 0xc2 /* mov es,dx */\
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0x51 /* push ecx */\
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0xc1 0xe9 0x02 /* shr ecx,2 */\
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0xf3 0xa5 /* rep movsd */\
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0x59 /* pop ecx */\
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0x83 0xe1 0x03 /* and ecx,3 */\
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0xf3 0xa4 /* rep movsb */\
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0x07 /* pop es */\
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parm [dx edi] [esi] [ecx] \
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modify exact [edi esi ecx];
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extern void movebwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
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#pragma aux movebwd = \
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0x06 /* push es */\
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0x8e 0xc2 /* mov es,dx */\
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0xfd /* std */\
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0x4e /* dec esi */\
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0x4f /* dec edi */\
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0xd1 0xe9 /* shr ecx,1 */\
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0x66 0xf3 0xa5 /* rep movsw */\
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0x11 0xc9 /* adc ecx,ecx */\
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0x46 /* inc esi */\
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0x47 /* inc edi */\
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0x66 0xf3 0xa4 /* rep movsb */\
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0x07 /* pop es */\
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0xfc /* cld */\
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parm [dx edi] [esi] [ecx] \
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modify exact [edi esi ecx];
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#define HAVE_MOVEFWBW
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#elif defined(M_I86) && defined(__SMALL_DATA__)
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extern void movebwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
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#pragma aux movebwd = \
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0xfd /* std */\
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0x4e /* dec si */\
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0x4f /* dec di */\
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0xd1 0xe9 /* shr cx,1 */\
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0xf3 0xa5 /* rep movsw */\
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0x11 0xc9 /* adc cx,cx */\
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0x46 /* inc si */\
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0x47 /* inc di */\
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0xf3 0xa4 /* rep movsb */\
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0xfc /* cld */\
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parm [es di] [si] [cx] \
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modify exact [di si cx];
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extern void movefwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
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#pragma aux movefwd = \
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0xd1 0xe9 /* shr cx,1 */\
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0xf3 0xa5 /* rep movsw */\
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0x11 0xc9 /* adc cx,cx */\
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0xf3 0xa4 /* rep movsb */\
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parm [es di] [si] [cx] \
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modify exact [di si cx];
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#define HAVE_MOVEFWBW
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#elif defined(M_I86) && defined(__BIG_DATA__)
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extern void movebwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len);
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#pragma aux movebwd = \
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0x1e /* push ds */ \
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0x8e 0xda /* mov ds,dx */ \
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0xfd /* std */\
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0x4e /* dec si */\
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0x4f /* dec di */\
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0xd1 0xe9 /* shr cx,1 */\
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0xf3 0xa5 /* rep movsw */\
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0x11 0xc9 /* adc cx,cx */\
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0x46 /* inc si */\
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0x47 /* inc di */\
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0xf3 0xa4 /* rep movsb */\
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0xfc /* cld */\
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0x1f /* pop ds */ \
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parm [es di] [dx si] [cx] \
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modify exact [di si cx];
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extern void movefwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len);
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#pragma aux movefwd = \
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0x1e /* push ds */ \
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0x8e 0xda /* mov ds,dx */ \
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0xd1 0xe9 /* shr cx,1 */\
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0xf3 0xa5 /* rep movsw */\
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0x11 0xc9 /* adc cx,cx */\
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0xf3 0xa4 /* rep movsb */\
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0x1f /* pop ds */ \
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parm [es di] [dx si] [cx] \
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modify exact [di si cx];
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#define HAVE_MOVEFWBW
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#else
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// no pragma for non-x86
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#endif
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_WCRTLINK void *memmove( void *toStart, const void *fromStart, size_t len )
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{
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const char *from = fromStart;
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char *to = toStart;
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if( from == to ) {
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return( to );
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}
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if( from < to && from + len > to ) { /* if buffers are overlapped*/
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#if defined( __HUGE__ ) || !defined( HAVE_MOVEFWBW )
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to += len;
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from += len;
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while( len != 0 ) {
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*--to = *--from;
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len--;
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}
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#else
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movebwd(( to + len ) - 1, ( from + len ) - 1, len );
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#endif
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} else {
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#if !defined( HAVE_MOVEFWBW )
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while( len != 0 ) {
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*to++ = *from++;
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len--;
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}
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#else
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movefwd( to, from, len );
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#endif
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}
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#if defined(__HUGE__) || !defined( HAVE_MOVEFWBW )
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return( toStart );
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#else
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return( to );
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#endif
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}
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