1/*-
2 * Copyright (c) 1992, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 *	Keith Bostic.  All rights reserved.
6 *
7 * See the LICENSE file for redistribution information.
8 */
9
10#include "config.h"
11
12#ifndef lint
13static const char sccsid[] = "$Id: ex_equal.c,v 10.12 2001/06/25 15:19:15 skimo Exp $";
14#endif /* not lint */
15
16#include <sys/types.h>
17#include <sys/queue.h>
18#include <sys/time.h>
19
20#include <bitstring.h>
21#include <limits.h>
22#include <stdio.h>
23
24#include "../common/common.h"
25
26/*
27 * ex_equal -- :address =
28 *
29 * PUBLIC: int ex_equal(SCR *, EXCMD *);
30 */
31int
32ex_equal(SCR *sp, EXCMD *cmdp)
33{
34	recno_t lno;
35
36	NEEDFILE(sp, cmdp);
37
38	/*
39	 * Print out the line number matching the specified address,
40	 * or the number of the last line in the file if no address
41	 * specified.
42	 *
43	 * !!!
44	 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
45	 * empty file displayed 1.  Until somebody complains loudly,
46	 * we're going to do it right.  The tables in excmd.c permit
47	 * lno to get away with any address from 0 to the end of the
48	 * file, which, in an empty file, is 0.
49	 */
50	if (F_ISSET(cmdp, E_ADDR_DEF)) {
51		if (db_last(sp, &lno))
52			return (1);
53	} else
54		lno = cmdp->addr1.lno;
55
56	(void)ex_printf(sp, "%ld\n", lno);
57	return (0);
58}
59