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