1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24#include <ast.h>
25
26#if _lib_memmove
27
28NoN(memmove)
29
30#else
31
32void*
33memmove(void* to, const void* from, register size_t n)
34{
35	register char*	out = (char*)to;
36	register char*	in = (char*)from;
37
38	if (n <= 0)	/* works if size_t is signed or not */
39		;
40	else if (in + n <= out || out + n <= in)
41		return(memcpy(to, from, n));	/* hope it's fast*/
42	else if (out < in)
43		do *out++ = *in++; while (--n > 0);
44	else
45	{
46		out += n;
47		in += n;
48		do *--out = *--in; while(--n > 0);
49	}
50	return(to);
51}
52
53#endif
54