usr/src/lib/libcurses/screen/ripoffline.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 /*
  45  * This routine is used by initialization routines. It sets it up
  46  * such that a line is removed from the user's screen by initscr. This
  47  * function must be called BEFORE initscr. It works by leaving a cookie
  48  * which tells initscr to reduce the size of stdscr by one for each line
  49  * ripped off. This routine has been generalized so that other applications
  50  * can make use of it in a straightforward manner.
  51  */
  52
  53 #include <sys/types.h>
  54 #include "curses_inc.h"
  55
  56 static  struct _ripdef
  57 {
  58         int line;
  59         int (*initfunction)(WINDOW *, int);
  60 } _ripstruct[5];
  61
  62 static char _ripcounter;
  63
  64 static  void
  65 _init_rip_func(void)
  66 {
  67         int     i, flag;
  68
  69         for (i = 0; i < _ripcounter; i++) {
  70                 LINES = --SP->lsize;
  71 /*
  72  * We don't need to check for newwin returning NULL because even if
  73  * we did and broke from the for loop, the application's initfunction
  74  * would not be called and they would have a NULL window pointer.  Their
  75  * code would then blow up if they don't check it anyway.  Therefore,
  76  * we can send in the newwin and their code has to check for NULL in either
  77  * case.
  78  *
  79  * NOTE:  The application has the responsibilty to do a delwin !!!
  80  */
  81                 (*_ripstruct[i].initfunction) (newwin(1, COLS,
  82                     ((flag = _ripstruct[i].line) > 0) ? 0 : LINES, 0), COLS);
  83                 if (flag > 0)
  84                     SP->Yabove++;
  85         }
  86         _ripcounter = 0;
  87 }
  88
  89 int
  90 ripoffline(int line, int (*initfunction)(WINDOW *, int))
  91 {
  92         if (_ripcounter < 5) {
  93                 _ripstruct[_ripcounter].line = line;
  94                 _ripstruct[_ripcounter++].initfunction = initfunction;
  95         }
  96         _rip_init = _init_rip_func;
  97         return (OK);
  98 }