1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2010 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 28 NoN(memmove) 29 30 #else 31 32 void* 33 memmove(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