/* bcopy -- copy memory regions of arbitary length @deftypefn Supplemental void bcopy (char *@var{in}, char *@var{out}, int @var{length}) Copies @var{length} bytes from memory region @var{in} to region@var{out}.  The use of @code{bcopy} is deprecated in new programs. @end deftypefn */ #include <stddef.h> voidbcopy (const void *src, void *dest, size_t len){  if (dest < src)    {      const char *firsts = (const char *) src;      char *firstd = (char *) dest;      while (len--)	*firstd++ = *firsts++;    }  else    {      const char *lasts = (const char *)src + (len-1);      char *lastd = (char *)dest + (len-1);      while (len--)        *lastd-- = *lasts--;    }}