bcopy.c revision 33965 
1/* bcopy -- copy memory regions of arbitary length
2
3NAME
4	bcopy -- copy memory regions of arbitrary length
5
6SYNOPSIS
7	void bcopy (char *in, char *out, int length)
8
9DESCRIPTION
10	Copy LENGTH bytes from memory region pointed to by IN to memory
11	region pointed to by OUT.
12
13BUGS
14	Significant speed improvements can be made in some cases by
15	implementing copies of multiple bytes simultaneously, or unrolling
16	the copy loop.
17
18*/
19
20void
21bcopy (src, dest, len)
22  register char *src, *dest;
23  int len;
24{
25  if (dest < src)
26    while (len--)
27      *dest++ = *src++;
28  else
29    {
30      char *lasts = src + (len-1);
31      char *lastd = dest + (len-1);
32      while (len--)
33        *(char *)lastd-- = *(char *)lasts--;
34    }
35}
36