lib/libcurses/clrtobot.c

   1 /*      $NetBSD: clrtobot.c,v 1.22 2012/02/19 19:38:13 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 1981, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)clrtobot.c  8.2 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: clrtobot.c,v 1.22 2012/02/19 19:38:13 christos Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include <stdlib.h>
  42 #include "curses.h"
  43 #include "curses_private.h"
  44
  45 #ifndef _CURSES_USE_MACROS
  46
  47 /*
  48  * clrtobot --
  49  *      Erase everything on stdscr.
  50  */
  51 int
  52 clrtobot(void)
  53 {
  54         return wclrtobot(stdscr);
  55 }
  56
  57 #endif
  58
  59 /*
  60  * wclrtobot --
  61  *      Erase everything on the window.
  62  */
  63 int
  64 wclrtobot(WINDOW *win)
  65 {
  66         int      minx, startx, starty, y;
  67         __LDATA *sp, *end, *maxx;
  68         attr_t  attr;
  69
  70 #ifdef __GNUC__
  71         maxx = NULL;            /* XXX gcc -Wuninitialized */
  72 #endif
  73         if (win->alines[win->cury]->flags & __ISPASTEOL) {
  74                 starty = win->cury + 1;
  75                 startx = 0;
  76         } else {
  77                 starty = win->cury;
  78                 startx = win->curx;
  79         }
  80         if (win != curscr)
  81                 attr = win->battr & __ATTRIBUTES;
  82         else
  83                 attr = 0;
  84         for (y = starty; y < win->maxy; y++) {
  85                 minx = -1;
  86                 end = &win->alines[y]->line[win->maxx];
  87                 for (sp = &win->alines[y]->line[startx]; sp < end; sp++) {
  88 #ifndef HAVE_WCHAR
  89                         if (sp->ch != win->bch || sp->attr != attr) {
  90 #else
  91                         if (sp->ch != (wchar_t)btowc((int) win->bch) ||
  92                             (sp->attr & WA_ATTRIBUTES) != attr || sp->nsp) {
  93 #endif /* HAVE_WCHAR */
  94                                 maxx = sp;
  95                                 if (minx == -1)
  96                                         minx = (int)(sp - win->alines[y]->line);
  97                                 if (sp->attr & __ALTCHARSET)
  98                                         sp->attr = attr | __ALTCHARSET;
  99                                 else
 100                                         sp->attr = attr;
 101 #ifdef HAVE_WCHAR
 102                                 sp->ch = ( wchar_t )btowc(( int ) win->bch);
 103                                 if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
 104                                         return ERR;
 105                                 SET_WCOL( *sp, 1 );
 106 #else
 107                                 sp->ch = win->bch;
 108 #endif /* HAVE_WCHAR */
 109                         }
 110                 }
 111
 112                 if (minx != -1)
 113                         __touchline(win, y, minx,
 114                                     (int) (maxx - win->alines[y]->line));
 115                 startx = 0;
 116         }
 117         return (OK);
 118 }