79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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_memcpy.c - part of string library functions
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Written By - Sandeep Dutta . sandeep.dutta@usa.net (1999)
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding!
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-------------------------------------------------------------------------*/
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#include "string.h"
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#include <sdcc-lib.h>
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#if !_SDCC_PORT_PROVIDES_MEMCPY
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#define NULL (void *)0
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void * memcpy (
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void * dst,
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void * src,
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int acount
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)
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{
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#if _SDCC_Z80_STYLE_LIB_OPT
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#pragma NOINDUCTION
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char * d = dst;
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char * s = src;
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int count = -acount;
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count /= 4;
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while (count) {
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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count++;
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}
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if (acount & 2) {
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*d++ = *s++;
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*d++ = *s++;
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}
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if (acount & 1) {
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*d++ = *s++;
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}
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return dst;
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#else
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void * ret = dst;
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char * d = dst;
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char * s = src;
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/*
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* copy from lower addresses to higher addresses
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*/
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while (acount--) {
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*d++ = *s++;
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}
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return(ret);
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#endif
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}
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#endif
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