slang/slmemset.c

   1 /* Copyright (c) 1992, 1995 John E. Davis
   2  * All rights reserved.
   3  *
   4  * You may distribute under the terms of either the GNU General Public
   5  * License or the Perl Artistic License.
   6  */
   7
   8
   9 /* These routines are fast memcpy, memset routines.  When available, I
  10    use system rouines.  For msdos, I use inline assembly. */
  11
  12 /* The current versions only work in the forward direction only!! */
  13
  14 #include "config.h"
  15
  16 #include <stdio.h>
  17
  18
  19 #include "_slang.h"
  20
  21 void SLmemset(char *p, char space, int n)
  22 {
  23 #if defined(msdos) && !defined(__WIN32__) && !defined(__GO32__)
  24    asm mov al, space
  25    asm mov dx, di
  26    asm mov cx, n
  27    asm les di, p
  28    asm cld
  29    asm rep stosb
  30    asm mov di, dx
  31 #else
  32    register char *pmax;
  33
  34    pmax = p + (n - 4);
  35    n = n % 4;
  36    while (p <= pmax)
  37      {
  38         *p++ = space; *p++ = space; *p++ = space; *p++= space;
  39      }
  40    while (n--) *p++ = space;
  41 #endif
  42 }