source: trunk/src/binutils/libiberty/bcopy.c@ 83

/* bcopy -- copy memory regions of arbitary length

NAME
        bcopy -- copy memory regions of arbitrary length

SYNOPSIS
        void bcopy (char *in, char *out, int length)

DESCRIPTION
        Copy LENGTH bytes from memory region pointed to by IN to memory
        region pointed to by OUT.

BUGS
        Significant speed improvements can be made in some cases by
        implementing copies of multiple bytes simultaneously, or unrolling
        the copy loop.

*/

void
bcopy (src, dest, len)
  register char *src, *dest;
  int len;
{
  if (dest < src)
    while (len--)
      *dest++ = *src++;
  else
    {
      char *lasts = src + (len-1);
      char *lastd = dest + (len-1);
      while (len--)
        *(char *)lastd-- = *(char *)lasts--;
    }
}