1 /* 2 * memmove.c: memmove compat implementation. 3 * 4 * Copyright (c) 2001-2006, NLnet Labs. All rights reserved. 5 * 6 * See LICENSE for the license. 7 */ 8 9 #include <config.h> 10 #include <stdlib.h> 11 12 void *memmove(void *dest, const void *src, size_t n); 13 14 void *memmove(void *dest, const void *src, size_t n) 15 { 16 uint8_t* from = (uint8_t*) src; 17 uint8_t* to = (uint8_t*) dest; 18 19 if (from == to || n == 0) 20 return dest; 21 if (to > from && to-from < (int)n) { 22 /* to overlaps with from */ 23 /* <from......> */ 24 /* <to........> */ 25 /* copy in reverse, to avoid overwriting from */ 26 int i; 27 for(i=n-1; i>=0; i--) 28 to[i] = from[i]; 29 return dest; 30 } 31 if (from > to && from-to < (int)n) { 32 /* to overlaps with from */ 33 /* <from......> */ 34 /* <to........> */ 35 /* copy forwards, to avoid overwriting from */ 36 size_t i; 37 for(i=0; i<n; i++) 38 to[i] = from[i]; 39 return dest; 40 } 41 memcpy(dest, src, n); 42 return dest; 43 } 44