summaryrefslogtreecommitdiff
path: root/lib/memmove.c
blob: 753c899d387adf0177cb0cba0f5ef0f43e6ff759 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
/* memmove.c -- copy memory.
   Copy LENGTH bytes from SOURCE to DEST.  Does not null-terminate.
   In the public domain.
   By David MacKenzie <djm@gnu.ai.mit.edu>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stddef.h>

void *
memmove (void *dest0, void const *source0, size_t length)
{
  char *dest = dest0;
  char const *source = source0;
  if (source < dest)
    /* Moving from low mem to hi mem; start at end.  */
    for (source += length, dest += length; length; --length)
      *--dest = *--source;
  else if (source != dest)
    {
      /* Moving from hi mem to low mem; start at beginning.  */
      for (; length; --length)
	*dest++ = *source++;
    }
  return dest0;
}