ex/ex_equal.c

   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 10.11 2000/04/21 19:00:36 skimo Exp $ (Berkeley) $Date: 2000/04/21 19:00:36 $";
  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
  31 ex_equal(sp, cmdp)
  32         SCR *sp;
  33         EXCMD *cmdp;
  34 {
  35         db_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 }