compiler/clib/bzero.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     POSIX.1-2001 function bzero().
   6     Function is deprecated and removed from POSIX.1-2008
   7 */
   8
   9 #include <proto/exec.h>
  10
  11 #define bzero bzero_inline
  12 #include <strings.h>
  13 #undef bzero
  14
  15 /*****************************************************************************
  16
  17     NAME */
  18 #include <strings.h>
  19
  20         void bzero (
  21
  22 /*  SYNOPSIS */
  23         void * ptr,
  24         size_t    len)
  25
  26 /*  FUNCTION
  27         Write len zero bytes to ptr. If len is zero, does nothing.
  28
  29     INPUTS
  30         ptr - The first byte of the area in memory to be cleared.
  31         len - How many bytes to clear.
  32
  33     RESULT
  34
  35     NOTES
  36
  37     EXAMPLE
  38
  39     BUGS
  40
  41     SEE ALSO
  42
  43     INTERNALS
  44
  45 ******************************************************************************/
  46 {
  47     UBYTE * bptr = ptr;
  48
  49     while (((IPTR)bptr)&(AROS_LONGALIGN-1) && len)
  50     {
  51         *bptr ++ = 0;
  52         len --;
  53     }
  54
  55     if (len > sizeof(ULONG))
  56     {
  57         ULONG * ulptr = (ULONG *)bptr;
  58
  59         while (len > sizeof(ULONG))
  60         {
  61             *ulptr ++ = 0UL;
  62             len -= sizeof(ULONG);
  63         }
  64
  65         bptr = (UBYTE *)ulptr;
  66     }
  67
  68     while (len --)
  69         *bptr ++ = 0;
  70
  71 } /* bzero */
  72