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
bcopy(const void * src,void * dest,size_t len)15 bcopy (const void *src, void *dest, size_t len)
16 {
17   if (dest < src)
18     {
19       const char *firsts = (const char *) src;
20       char *firstd = (char *) 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 }
32