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 #include <config.h> 7 8 #include <stddef.h> 9 10 void * memmove(void * dest0,void const * source0,size_t length)11memmove (void *dest0, void const *source0, size_t length) 12 { 13 char *dest = dest0; 14 char const *source = source0; 15 if (source < dest) 16 /* Moving from low mem to hi mem; start at end. */ 17 for (source += length, dest += length; length; --length) 18 *--dest = *--source; 19 else if (source != dest) 20 { 21 /* Moving from hi mem to low mem; start at beginning. */ 22 for (; length; --length) 23 *dest++ = *source++; 24 } 25 return dest0; 26 } 27