compiler/stdc/memset.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function memset().
   6 */
   7
   8 #include <proto/exec.h>
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <string.h>
  14
  15         void * memset (
  16
  17 /*  SYNOPSIS */
  18         void * dest,
  19         int    c,
  20         size_t count)
  21
  22 /*  FUNCTION
  23         Fill the memory at dest with count times c.
  24
  25     INPUTS
  26         dest - The first byte of the destination area in memory
  27         c - The byte to fill memory with
  28         count - How many bytes to write
  29
  30     RESULT
  31         dest.
  32
  33     NOTES
  34
  35     EXAMPLE
  36
  37     BUGS
  38
  39     SEE ALSO
  40         memmove(), memcpy()
  41
  42     INTERNALS
  43
  44 ******************************************************************************/
  45 {
  46     UBYTE * ptr = dest;
  47
  48     while (((IPTR)ptr)&(AROS_LONGALIGN-1) && count)
  49     {
  50         *ptr ++ = c;
  51         count --;
  52     }
  53
  54     if (count > sizeof(ULONG))
  55     {
  56         ULONG * ulptr = (ULONG *)ptr;
  57         ULONG fill;
  58
  59         fill = (ULONG)(c & 0xFF);
  60         fill = (fill <<  8) | fill;
  61         fill = (fill << 16) | fill;
  62
  63         while (count > sizeof(ULONG))
  64         {
  65             *ulptr ++ = fill;
  66             count -= sizeof(ULONG);
  67         }
  68
  69         ptr = (UBYTE *)ulptr;
  70     }
  71
  72     while (count --)
  73         *ptr ++ = c;
  74
  75     return dest;
  76 } /* memset */
  77