1/* memmove.c -- copy memory.
2   Copy LENGTH bytes from SOURCE to DEST.  Does not null-terminate.
3   In the public domain.
4   By David MacKenzie <djm@gnu.ai.mit.edu>.  */
5#include <sys/cdefs.h>
6__RCSID("$NetBSD: memmove.c,v 1.2 2016/05/17 14:00:09 christos Exp $");
7
8#ifdef HAVE_CONFIG_H
9# include <config.h>
10#endif
11
12#include <stddef.h>
13
14void *
15memmove (void *dest0, void const *source0, size_t length)
16{
17  char *dest = dest0;
18  char const *source = source0;
19  if (source < dest)
20    /* Moving from low mem to hi mem; start at end.  */
21    for (source += length, dest += length; length; --length)
22      *--dest = *--source;
23  else if (source != dest)
24    {
25      /* Moving from hi mem to low mem; start at beginning.  */
26      for (; length; --length)
27	*dest++ = *source++;
28    }
29  return dest0;
30}
31