-/* memcpy.c -- copy memory.
- Copy LENGTH bytes from SOURCE to DEST. Does not null-terminate.
- The source and destination regions may not overlap.
- In the public domain.
- By Jim Meyering. */
-
-/* FIXME: remove this before release. */
-#include <assert.h>
-#ifndef ABS
-# define ABS(x) ((x) < 0 ? (-(x)) : (x))
-#endif
-
-void
-memcpy (dest, source, length)
- char *dest;
- const char *source;
- unsigned length;
+/* Copyright (C) 1995, 1997, 2000, 2003, 2006, 2009-2010 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/>. */
+
+/* Written by Jim Meyering <meyering@na-net.ornl.gov>. */
+
+#include <config.h>
+
+#include <stddef.h>
+
+/* 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)
{
- assert (length >= 0);
- /* Make sure they don't overlap. */
- assert (ABS (dest - source) >= length);
+ char *dest = destaddr;
+ char const *src = srcaddr;
- for (; length; --length)
- *dest++ = *source++;
+ while (len-- > 0)
+ *dest++ = *src++;
+ return destaddr;
}