slmemset.c

来自「一个C格式的脚本处理函数库源代码,可让你的C程序具有执行C格式的脚本文件」· C语言 代码 · 共 40 行

/* Copyright (c) 1992, 1999, 2001, 2002, 2003 John E. Davis
 * This file is part of the S-Lang library.
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Perl Artistic License.
 */

/* These routines are fast memcpy, memset routines.  When available, I
   use system rouines.  For msdos, I use inline assembly. */

/* The current versions only work in the forward direction only!! */

#include "slinclud.h"

#include "slang.h"
#include "_slang.h"

void SLmemset(char *p, char space, int n)
{
#if defined(__BORLANDC__) && defined(__MSDOS__)
   asm mov al, space
   asm mov dx, di
   asm mov cx, n
   asm les di, p
   asm cld
   asm rep stosb
   asm mov di, dx
#else
   register char *pmax;

   pmax = p + (n - 4);
   n = n % 4;
   while (p <= pmax)
     {
	*p++ = space; *p++ = space; *p++ = space; *p++= space;
     }
   while (n--) *p++ = space;
#endif
}