bcopy.c revision 89858 
1/* bcopy -- copy memory regions of arbitary length
2
3@deftypefn Supplemental void bcopy (char *@var{in}, char *@var{out}, int @var{length})
4
5Copies @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
12void
13bcopy (src, dest, len)
14  register char *src, *dest;
15  int len;
16{
17  if (dest < src)
18    while (len--)
19      *dest++ = *src++;
20  else
21    {
22      char *lasts = src + (len-1);
23      char *lastd = dest + (len-1);
24      while (len--)
25        *(char *)lastd-- = *(char *)lasts--;
26    }
27}
28