162321Salfred/*-
262321Salfred * Copyright (c) 1992, 1993, 1994
362321Salfred *	The Regents of the University of California.  All rights reserved.
462321Salfred * Copyright (c) 1992, 1993, 1994, 1995, 1996
562321Salfred *	Keith Bostic.  All rights reserved.
662321Salfred *
762321Salfred * See the LICENSE file for redistribution information.
862321Salfred */
962321Salfred
1062321Salfred#include "config.h"
1162321Salfred
1262321Salfred#ifndef lint
1362321Salfredstatic const char sccsid[] = "$Id: ex_equal.c,v 10.12 2001/06/25 15:19:15 skimo Exp $";
1462321Salfred#endif /* not lint */
1592986Sobrien
1662321Salfred#include <sys/types.h>
1762321Salfred#include <sys/queue.h>
1862321Salfred#include <sys/time.h>
1992986Sobrien
2092986Sobrien#include <bitstring.h>
2162321Salfred#include <limits.h>
2262321Salfred#include <stdio.h>
2362321Salfred
2462321Salfred#include "../common/common.h"
2562321Salfred
2692941Sobrien/*
2792941Sobrien * ex_equal -- :address =
2862321Salfred *
2962321Salfred * PUBLIC: int ex_equal(SCR *, EXCMD *);
3062321Salfred */
3162321Salfredint
3262321Salfredex_equal(SCR *sp, EXCMD *cmdp)
3392905Sobrien{
3462321Salfred	recno_t lno;
3562321Salfred
3662321Salfred	NEEDFILE(sp, cmdp);
3762321Salfred
3862321Salfred	/*
3962321Salfred	 * Print out the line number matching the specified address,
4062321Salfred	 * or the number of the last line in the file if no address
4162321Salfred	 * specified.
4262321Salfred	 *
4362321Salfred	 * !!!
4462321Salfred	 * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
4562321Salfred	 * empty file displayed 1.  Until somebody complains loudly,
4662321Salfred	 * we're going to do it right.  The tables in excmd.c permit
4762321Salfred	 * lno to get away with any address from 0 to the end of the
4862321Salfred	 * file, which, in an empty file, is 0.
4962321Salfred	 */
5062321Salfred	if (F_ISSET(cmdp, E_ADDR_DEF)) {
5162321Salfred		if (db_last(sp, &lno))
5262321Salfred			return (1);
5362321Salfred	} else
5492905Sobrien		lno = cmdp->addr1.lno;
5562321Salfred
5662321Salfred	(void)ex_printf(sp, "%ld\n", lno);
5762321Salfred	return (0);
5862321Salfred}
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