🚀 go-pugleaf

I tried to compile Joel Spolsky's vt100clock program from Vol. 6, Issue 98,
archived as clock.msk.  I am running on a BSD 4.3 system, if that is any
help.  The command 'cc vt100clock.c' produced the output:

Undefined:
_cuserid

Joel #includes a number of the usual sorts of .h files, but none of them
contain cuserid(), in fact, a grep of /usr/include and /usr/include/sys gave
me no clue about the function or what it does.  I assume that it is a SysV
function, but a quick look at the ATT SysV Programmers Guide (I don't have
the books in front of me so that may not be a completely accurate title)
(Vols. I and II) also did not find cuserid() in the index.  It shows up in
two places in Joel's program:

    /* remember where mail is kept */
    sprintf(path, MAILFILE, cuserid(NULL));

and

	/* check mail */
	old_size = new_size;
	if (!stat(sprintf(path, MAILFILE, cuserid(NULL)), &st))
	    new_size = st.st_size;
	else 
	    new_size = 0;

Can anybody tell me (1) what it does, (2) if there is a BSD equivalent or
near-equivalent, and/or (3) what to do about it?  

Thanks much.


-- 
Paul Neubauer         neubauer@bsu-cs.bsu.edu        neubauer@bsu-cs.UUCP
                      <backbones>!{iuvax,pur-ee}!bsu-cs!neubauer