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

   1 /*      $NetBSD: ex_equal.c,v 1.3 2014/01/26 21:43:45 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 #include <sys/cdefs.h>
  14 #if 0
  15 #ifndef lint
  16 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 ";
  17 #endif /* not lint */
  18 #else
  19 __RCSID("$NetBSD: ex_equal.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
  20 #endif
  21
  22 #include <sys/types.h>
  23 #include <sys/queue.h>
  24
  25 #include <bitstring.h>
  26 #include <limits.h>
  27 #include <stdio.h>
  28
  29 #include "../common/common.h"
  30
  31 /*
  32  * ex_equal -- :address =
  33  *
  34  * PUBLIC: int ex_equal __P((SCR *, EXCMD *));
  35  */
  36 int
  37 ex_equal(SCR *sp, EXCMD *cmdp)
  38 {
  39         db_recno_t lno;
  40
  41         NEEDFILE(sp, cmdp);
  42
  43         /*
  44          * Print out the line number matching the specified address,
  45          * or the number of the last line in the file if no address
  46          * specified.
  47          *
  48          * !!!
  49          * Historically, ":0=" displayed 0, and ":=" or ":1=" in an
  50          * empty file displayed 1.  Until somebody complains loudly,
  51          * we're going to do it right.  The tables in excmd.c permit
  52          * lno to get away with any address from 0 to the end of the
  53          * file, which, in an empty file, is 0.
  54          */
  55         if (F_ISSET(cmdp, E_ADDR_DEF)) {
  56                 if (db_last(sp, &lno))
  57                         return (1);
  58         } else
  59                 lno = cmdp->addr1.lno;
  60
  61         (void)ex_printf(sp, "%ld\n", (unsigned long)lno);
  62         return (0);
  63 }