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[] = "$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 */
31 int
ex_equal(SCR * sp,EXCMD * cmdp)32 ex_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