1da2e3ebdSchin /***********************************************************************
2da2e3ebdSchin *                                                                      *
3da2e3ebdSchin *               This software is part of the ast package               *
4*b30d1939SAndy Fiddaman *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5da2e3ebdSchin *                      and is licensed under the                       *
6*b30d1939SAndy Fiddaman *                 Eclipse Public License, Version 1.0                  *
77c2fbfb3SApril Chin *                    by AT&T Intellectual Property                     *
8da2e3ebdSchin *                                                                      *
9da2e3ebdSchin *                A copy of the License is available at                 *
10*b30d1939SAndy Fiddaman *          http://www.eclipse.org/org/documents/epl-v10.html           *
11*b30d1939SAndy Fiddaman *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12da2e3ebdSchin *                                                                      *
13da2e3ebdSchin *              Information and Software Systems Research               *
14da2e3ebdSchin *                            AT&T Research                             *
15da2e3ebdSchin *                           Florham Park NJ                            *
16da2e3ebdSchin *                                                                      *
17da2e3ebdSchin *                 Glenn Fowler <gsf@research.att.com>                  *
18da2e3ebdSchin *                  David Korn <dgk@research.att.com>                   *
19da2e3ebdSchin *                   Phong Vo <kpv@research.att.com>                    *
20da2e3ebdSchin *                                                                      *
21da2e3ebdSchin ***********************************************************************/
22da2e3ebdSchin #pragma prototyped
23da2e3ebdSchin 
24da2e3ebdSchin #include <ast.h>
25da2e3ebdSchin 
26da2e3ebdSchin #if _lib_memmove
27da2e3ebdSchin 
28da2e3ebdSchin NoN(memmove)
29da2e3ebdSchin 
30da2e3ebdSchin #else
31da2e3ebdSchin 
32da2e3ebdSchin void*
33da2e3ebdSchin memmove(void* to, const void* from, register size_t n)
34da2e3ebdSchin {
35da2e3ebdSchin 	register char*	out = (char*)to;
36da2e3ebdSchin 	register char*	in = (char*)from;
37da2e3ebdSchin 
38da2e3ebdSchin 	if (n <= 0)	/* works if size_t is signed or not */
39da2e3ebdSchin 		;
40da2e3ebdSchin 	else if (in + n <= out || out + n <= in)
41da2e3ebdSchin 		return(memcpy(to, from, n));	/* hope it's fast*/
42da2e3ebdSchin 	else if (out < in)
43da2e3ebdSchin 		do *out++ = *in++; while (--n > 0);
44da2e3ebdSchin 	else
45da2e3ebdSchin 	{
46da2e3ebdSchin 		out += n;
47da2e3ebdSchin 		in += n;
48da2e3ebdSchin 		do *--out = *--in; while(--n > 0);
49da2e3ebdSchin 	}
50da2e3ebdSchin 	return(to);
51da2e3ebdSchin }
52da2e3ebdSchin 
53da2e3ebdSchin #endif
54