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51 lines
1 KiB
C
51 lines
1 KiB
C
/* Copyright (c) 1992, 1995 John E. Davis
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* All rights reserved.
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Perl Artistic License.
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*/
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/* These routines are fast memcpy, memset routines. When available, I
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use system rouines. For msdos, I use inline assembly. */
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/* The current versions only work in the forward direction only!! */
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#include "config.h"
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#include <stdio.h>
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#include "slang.h"
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#include "_slang.h"
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char *SLmemcpy(char *s1, char *s2, int n)
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{
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#if defined(msdos) && !defined(__WIN32__) && !defined(__GO32__)
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asm mov ax, ds
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asm mov bx, si
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asm mov dx, di
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asm mov cx, n
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asm les di, s1
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asm lds si, s2
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asm cld
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asm rep movsb
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asm mov ds, ax
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asm mov si, bx
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asm mov di, dx
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return(s1);
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#else
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register char *smax, *s = s1;
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int n2;
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n2 = n % 4;
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smax = s + (n - 4);
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while (s <= smax)
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{
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*s = *s2; *(s + 1) = *(s2 + 1); *(s + 2) = *(s2 + 2); *(s + 3) = *(s2 + 3);
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s += 4;
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s2 += 4;
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}
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while (n2--) *s++ = *s2++;
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return(s1);
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#endif
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}
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