compiler/clib/bzero.c

   1 /*
   2     Copyright © 1995-2003, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     ANSI C function bzero().
   6 */
   7
   8 #include <proto/exec.h>
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <string.h>
  14
  15         void bzero (
  16
  17 /*  SYNOPSIS */
  18         void * ptr,
  19         size_t    len)
  20
  21 /*  FUNCTION
  22         Write len zero bytes to ptr. If len is zero, does nothing.
  23
  24     INPUTS
  25         ptr - The first byte of the area in memory to be cleared.
  26         len - How many bytes to clear.
  27
  28     RESULT
  29
  30     NOTES
  31
  32     EXAMPLE
  33
  34     BUGS
  35
  36     SEE ALSO
  37
  38     INTERNALS
  39
  40 ******************************************************************************/
  41 {
  42     UBYTE * bptr = ptr;
  43
  44     while (((IPTR)bptr)&(AROS_LONGALIGN-1) && len)
  45     {
  46         *bptr ++ = 0;
  47         len --;
  48     }
  49
  50     if (len > sizeof(ULONG))
  51     {
  52         ULONG * ulptr = (ULONG *)bptr;
  53
  54         while (len > sizeof(ULONG))
  55         {
  56             *ulptr ++ = 0UL;
  57             len -= sizeof(ULONG);
  58         }
  59
  60         bptr = (UBYTE *)ulptr;
  61     }
  62
  63     while (len --)
  64         *bptr ++ = 0;
  65
  66 } /* bzero */
  67