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Clib string & memory functions

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git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
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Sergey Semyonov (Serge)
2007-06-26 00:54:22 +00:00
parent d5f66e011c
commit 836c97f0ac
162 changed files with 11855 additions and 0 deletions
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programs/develop/open watcom/trunk/clib/memory/memmove.c Normal file
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/****************************************************************************
*
* 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: Implementation of memmove().
*
****************************************************************************/
#include "variety.h"
#include <stddef.h>
#include <string.h>
#if defined(__386__)
extern void movefwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
#pragma aux movefwd = \
0x06 /* push es */\
0x8e 0xc2 /* mov es,dx */\
0x51 /* push ecx */\
0xc1 0xe9 0x02 /* shr ecx,2 */\
0xf3 0xa5 /* rep movsd */\
0x59 /* pop ecx */\
0x83 0xe1 0x03 /* and ecx,3 */\
0xf3 0xa4 /* rep movsb */\
0x07 /* pop es */\
parm [dx edi] [esi] [ecx] \
modify exact [edi esi ecx];
extern void movebwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
#pragma aux movebwd = \
0x06 /* push es */\
0x8e 0xc2 /* mov es,dx */\
0xfd /* std */\
0x4e /* dec esi */\
0x4f /* dec edi */\
0xd1 0xe9 /* shr ecx,1 */\
0x66 0xf3 0xa5 /* rep movsw */\
0x11 0xc9 /* adc ecx,ecx */\
0x46 /* inc esi */\
0x47 /* inc edi */\
0x66 0xf3 0xa4 /* rep movsb */\
0x07 /* pop es */\
0xfc /* cld */\
parm [dx edi] [esi] [ecx] \
modify exact [edi esi ecx];
#define HAVE_MOVEFWBW
#elif defined(M_I86) && defined(__SMALL_DATA__)
extern void movebwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
#pragma aux movebwd = \
0xfd /* std */\
0x4e /* dec si */\
0x4f /* dec di */\
0xd1 0xe9 /* shr cx,1 */\
0xf3 0xa5 /* rep movsw */\
0x11 0xc9 /* adc cx,cx */\
0x46 /* inc si */\
0x47 /* inc di */\
0xf3 0xa4 /* rep movsb */\
0xfc /* cld */\
parm [es di] [si] [cx] \
modify exact [di si cx];
extern void movefwd( char _WCFAR *dst, const char _WCNEAR *src, unsigned len);
#pragma aux movefwd = \
0xd1 0xe9 /* shr cx,1 */\
0xf3 0xa5 /* rep movsw */\
0x11 0xc9 /* adc cx,cx */\
0xf3 0xa4 /* rep movsb */\
parm [es di] [si] [cx] \
modify exact [di si cx];
#define HAVE_MOVEFWBW
#elif defined(M_I86) && defined(__BIG_DATA__)
extern void movebwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len);
#pragma aux movebwd = \
0x1e /* push ds */ \
0x8e 0xda /* mov ds,dx */ \
0xfd /* std */\
0x4e /* dec si */\
0x4f /* dec di */\
0xd1 0xe9 /* shr cx,1 */\
0xf3 0xa5 /* rep movsw */\
0x11 0xc9 /* adc cx,cx */\
0x46 /* inc si */\
0x47 /* inc di */\
0xf3 0xa4 /* rep movsb */\
0xfc /* cld */\
0x1f /* pop ds */ \
parm [es di] [dx si] [cx] \
modify exact [di si cx];
extern void movefwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len);
#pragma aux movefwd = \
0x1e /* push ds */ \
0x8e 0xda /* mov ds,dx */ \
0xd1 0xe9 /* shr cx,1 */\
0xf3 0xa5 /* rep movsw */\
0x11 0xc9 /* adc cx,cx */\
0xf3 0xa4 /* rep movsb */\
0x1f /* pop ds */ \
parm [es di] [dx si] [cx] \
modify exact [di si cx];
#define HAVE_MOVEFWBW
#else
// no pragma for non-x86
#endif
_WCRTLINK void *memmove( void *toStart, const void *fromStart, size_t len )
{
const char *from = fromStart;
char *to = toStart;
if( from == to ) {
return( to );
}
if( from < to && from + len > to ) { /* if buffers are overlapped*/
#if defined( __HUGE__ ) || !defined( HAVE_MOVEFWBW )
to += len;
from += len;
while( len != 0 ) {
*--to = *--from;
len--;
}
#else
movebwd(( to + len ) - 1, ( from + len ) - 1, len );
#endif
} else {
#if !defined( HAVE_MOVEFWBW )
while( len != 0 ) {
*to++ = *from++;
len--;
}
#else
movefwd( to, from, len );
#endif
}
#if defined(__HUGE__) || !defined( HAVE_MOVEFWBW )
return( toStart );
#else
return( to );
#endif
}