external/bsd/nvi/dist/ex/ex_equal.c

   1 /*      $NetBSD: ex_equal.c,v 1.2 2013/11/22 15:52:05 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #ifndef lint
  14 static const char sccsid[] = "Id: ex_equal.c,v 10.12 2001/06/25 15:19:15 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:15 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.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 __P((SCR *, EXCMD *));
  30  */
  31 int
  32 ex_equal(SCR *sp, EXCMD *cmdp)
  33 {
  34         db_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", (unsigned long)lno);
  57         return (0);
  58 }