-/* Copy LEN bytes starting at SRCADDR to DESTADDR. Result undefined
- if the source overlaps with the destination.
- Return DESTADDR. */
+/* Copyright (C) 1995, 1997, 2000, 2003, 2006, 2009-2012 Free Software
+ * Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include <assert.h>
+/* Written by Jim Meyering <meyering@na-net.ornl.gov>. */
-/* FIXME: uncomment the following for releases. */
-#define NDEBUG 1
+#include <config.h>
-#ifndef ABS
-# define ABS(x) ((x) < 0 ? (-(x)) : (x))
-#endif
+#include <stddef.h>
-char *
-memcpy (destaddr, srcaddr, len)
- char *destaddr;
- const char *srcaddr;
- int len;
+/* Copy LEN bytes starting at SRCADDR to DESTADDR. Result undefined
+ if the source overlaps with the destination.
+ Return DESTADDR. */
+
+void *
+memcpy (void *destaddr, void const *srcaddr, size_t len)
{
char *dest = destaddr;
-
- assert (len >= 0);
- /* Make sure they don't overlap. */
- assert (ABS (destaddr - srcaddr) >= len);
+ char const *src = srcaddr;
while (len-- > 0)
- *destaddr++ = *srcaddr++;
- return dest;
+ *dest++ = *src++;
+ return destaddr;
}