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https://github.com/KolibriOS/kolibrios.git
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69 lines
2.7 KiB
NASM
69 lines
2.7 KiB
NASM
;*****************************************************************************
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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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;
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; char *__COPY( char *dst, char *src, unsigned len );
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;
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;
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include mdef.inc
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name __copy
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_TEXT segment use32 para public 'CODE'
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assume cs:_TEXT
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public __COPY
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public __COPY_
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__COPY proc near
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__COPY_ proc near
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push edi ; save regs
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push esi ; ...
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push ecx ; ...
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mov edi,16+0[esp] ; get dst
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mov esi,16+4[esp] ; get src
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mov ecx,16+8[esp] ; get len
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mov eax,edi ; return with dst ptr in eax
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shr ecx,2 ; calc. # of dwords
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rep movsd ; do the copy
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mov ecx,16+8[esp] ; get len
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and ecx,3 ; plus extra bytes
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rep movsb ; do the copy
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pop ecx ; restore regs
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pop esi ; ...
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pop edi ; ...
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ret 12 ; return and remove parms
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__COPY_ endp
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__COPY endp
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_TEXT ends
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end
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