lib/string/memmove.c

   1 /*
   2  * $Id$
   3  */
   4
   5 #include <string.h>
   6
   7
   8 void * memmove(void *dest,const void *src,size_t count)
   9 {
  10     char *char_dest = (char *)dest;
  11     char *char_src = (char *)src;
  12
  13     if ((char_dest <= char_src) || (char_dest >= (char_src+count)))
  14     {
  15         /*  non-overlapping buffers */
  16         while(count > 0)
  17         {
  18             *char_dest = *char_src;
  19             char_dest++;
  20             char_src++;
  21             count--;
  22         }
  23     }
  24     else
  25     {
  26         /* overlaping buffers */
  27         char_dest = (char *)dest + count - 1;
  28         char_src = (char *)src + count - 1;
  29
  30         while(count > 0)
  31         {
  32            *char_dest = *char_src;
  33            char_dest--;
  34            char_src--;
  35            count--;
  36         }
  37     }
  38
  39     return dest;
  40 }