ex_equal.c revision 19304 
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[] = "@(#)ex_equal.c	10.10 (Berkeley) 3/6/96";
14#endif /* not lint */
15
16#include <sys/types.h>
17#include <sys/queue.h>
18
19#include <bitstring.h>
20#include <limits.h>
21#include <stdio.h>
22
23#include "../common/common.h"
24
25/*
26 * ex_equal -- :address =
27 *
28 * PUBLIC: int ex_equal __P((SCR *, EXCMD *));
29 */
30int
31ex_equal(sp, cmdp)
32	SCR *sp;
33	EXCMD *cmdp;
34{
35	recno_t lno;
36
37	NEEDFILE(sp, cmdp);
38
39	/*
40	 * Print out the line number matching the specified address,
41	 * or the number of the last line in the file if no address
42	 * specified.
43	 *
44	 * !!!
45	 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
46	 * empty file displayed 1.  Until somebody complains loudly,
47	 * we're going to do it right.  The tables in excmd.c permit
48	 * lno to get away with any address from 0 to the end of the
49	 * file, which, in an empty file, is 0.
50	 */
51	if (F_ISSET(cmdp, E_ADDR_DEF)) {
52		if (db_last(sp, &lno))
53			return (1);
54	} else
55		lno = cmdp->addr1.lno;
56
57	(void)ex_printf(sp, "%ld\n", lno);
58	return (0);
59}
60