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
13 static 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 */
30 int
ex_equal(sp,cmdp)31 ex_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