4.4BSD snapshot (revision 8.1); add 1993 to copyright
move cuserid() to libcompat, POSIX no longer requires it
Add include files to get prototype declarations, and fix bugs found.
use kernel MAXLOGNAME instead of UT_NAMESIZE (kernel's is bigger)
new copyright notice
correct cuserid error case; make setlogin invalidate getlogin cache; KNF
if kernel returns NULL string, return NULL to user; KNF
new getlogin using getlogname syscall; plus cuserid library call
return 0 not null string when user has a ctty but no utmp entry
added LIBC_SCCS condition for sccs ids
Add copyright
merge of 4.1b and 4.1c
date and time created 82/11/07 19:06:08 by sam