libiberty/bcopy.c

   1 /* bcopy -- copy memory regions of arbitary length
   2
   3 NAME
   4         bcopy -- copy memory regions of arbitrary length
   5
   6 SYNOPSIS
   7         void bcopy (char *in, char *out, int length)
   8
   9 DESCRIPTION
  10         Copy LENGTH bytes from memory region pointed to by IN to memory
  11         region pointed to by OUT.
  12
  13 BUGS
  14         Significant speed improvements can be made in some cases by
  15         implementing copies of multiple bytes simultaneously, or unrolling
  16         the copy loop.
  17
  18 */
  19
  20 void
  21 bcopy (src, dest, len)
  22   register char *src, *dest;
  23   int len;
  24 {
  25   if (dest < src)
  26     while (len--)
  27       *dest++ = *src++;
  28   else
  29     {
  30       char *lasts = src + (len-1);
  31       char *lastd = dest + (len-1);
  32       while (len--)
  33         *(char *)lastd-- = *(char *)lasts--;
  34     }
  35 }