lib/bcopy.c

   1 /* bcopy.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
  11 bcopy (void const *source0, void *dest0, size_t length)
  12 {
  13   char const *source = source0;
  14   char *dest = dest0;
  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     /* Moving from hi mem to low mem; start at beginning.  */
  21     for (; length; --length)
  22       *dest++ = *source++;
  23 }