1/*	$NetBSD: ex_equal.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
2/*-
3 * Copyright (c) 1992, 1993, 1994
4 *	The Regents of the University of California.  All rights reserved.
5 * Copyright (c) 1992, 1993, 1994, 1995, 1996
6 *	Keith Bostic.  All rights reserved.
7 *
8 * See the LICENSE file for redistribution information.
9 */
10
11#include "config.h"
12
13#include <sys/cdefs.h>
14#if 0
15#ifndef lint
16static const char sccsid[] = "Id: ex_equal.c,v 10.12 2001/06/25 15:19:15 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:15 ";
17#endif /* not lint */
18#else
19__RCSID("$NetBSD: ex_equal.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
20#endif
21
22#include <sys/types.h>
23#include <sys/queue.h>
24
25#include <bitstring.h>
26#include <limits.h>
27#include <stdio.h>
28
29#include "../common/common.h"
30
31/*
32 * ex_equal -- :address =
33 *
34 * PUBLIC: int ex_equal __P((SCR *, EXCMD *));
35 */
36int
37ex_equal(SCR *sp, EXCMD *cmdp)
38{
39	db_recno_t lno;
40
41	NEEDFILE(sp, cmdp);
42
43	/*
44	 * Print out the line number matching the specified address,
45	 * or the number of the last line in the file if no address
46	 * specified.
47	 *
48	 * !!!
49	 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
50	 * empty file displayed 1.  Until somebody complains loudly,
51	 * we're going to do it right.  The tables in excmd.c permit
52	 * lno to get away with any address from 0 to the end of the
53	 * file, which, in an empty file, is 0.
54	 */
55	if (F_ISSET(cmdp, E_ADDR_DEF)) {
56		if (db_last(sp, &lno))
57			return (1);
58	} else
59		lno = cmdp->addr1.lno;
60
61	(void)ex_printf(sp, "%ld\n", (unsigned long)lno);
62	return (0);
63}
64