libiberty/bcopy.c

   1 /* bcopy -- copy memory regions of arbitary length
   2
   3 @deftypefn Supplemental void bcopy (char *@var{in}, char *@var{out}, int @var{length})
   4
   5 Copies @var{length} bytes from memory region @var{in} to region
   6 @var{out}.  The use of @code{bcopy} is deprecated in new programs.
   7
   8 @end deftypefn
   9
  10 */
  11
  12 #include <stddef.h>
  13
  14 void
  15 bcopy (const void *src, void *dest, size_t len)
  16 {
  17   if (dest < src)
  18     {
  19       const char *firsts = src;
  20       char *firstd = dest;
  21       while (len--)
  22         *firstd++ = *firsts++;
  23     }
  24   else
  25     {
  26       const char *lasts = (const char *)src + (len-1);
  27       char *lastd = (char *)dest + (len-1);
  28       while (len--)
  29         *lastd-- = *lasts--;
  30     }
  31 }