memmove.c revision 1.1
1/* memmove.c -- copy memory. 2 Copy LENGTH bytes from SOURCE to DEST. Does not null-terminate. 3 In the public domain. 4 By David MacKenzie <djm@gnu.ai.mit.edu>. */ 5 6#ifdef HAVE_CONFIG_H 7# include <config.h> 8#endif 9 10#include <stddef.h> 11 12void * 13memmove (void *dest0, void const *source0, size_t length) 14{ 15 char *dest = dest0; 16 char const *source = source0; 17 if (source < dest) 18 /* Moving from low mem to hi mem; start at end. */ 19 for (source += length, dest += length; length; --length) 20 *--dest = *--source; 21 else if (source != dest) 22 { 23 /* Moving from hi mem to low mem; start at beginning. */ 24 for (; length; --length) 25 *dest++ = *source++; 26 } 27 return dest0; 28} 29