1 /* $OpenBSD: ex_equal.c,v 1.6 2014/11/12 04:28:41 bentley Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 1992, 1993, 1994, 1995, 1996
7 * Keith Bostic. All rights reserved.
8 *
9 * See the LICENSE file for redistribution information.
10 */
11
12 #include "config.h"
13
14 #include <sys/types.h>
15 #include <sys/queue.h>
16
17 #include <bitstring.h>
18 #include <limits.h>
19 #include <stdio.h>
20
21 #include "../common/common.h"
22
23 /*
24 * ex_equal -- :address =
25 *
26 * PUBLIC: int ex_equal(SCR *, EXCMD *);
27 */
28 int
ex_equal(SCR * sp,EXCMD * cmdp)29 ex_equal(SCR *sp, EXCMD *cmdp)
30 {
31 recno_t lno;
32
33 NEEDFILE(sp, cmdp);
34
35 /*
36 * Print out the line number matching the specified address,
37 * or the number of the last line in the file if no address
38 * specified.
39 *
40 * !!!
41 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
42 * empty file displayed 1. Until somebody complains loudly,
43 * we're going to do it right. The tables in excmd.c permit
44 * lno to get away with any address from 0 to the end of the
45 * file, which, in an empty file, is 0.
46 */
47 if (F_ISSET(cmdp, E_ADDR_DEF)) {
48 if (db_last(sp, &lno))
49 return (1);
50 } else
51 lno = cmdp->addr1.lno;
52
53 (void)ex_printf(sp, "%ld\n", lno);
54 return (0);
55 }
56