lib/libcurses/erase.c

   1 /*      $NetBSD: erase.c,v 1.25 2011/07/10 12:11:49 blymn 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[] = "@(#)erase.c     8.2 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: erase.c,v 1.25 2011/07/10 12:11:49 blymn Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include <stdlib.h>
  42
  43 #include "curses.h"
  44 #include "curses_private.h"
  45
  46 #ifndef _CURSES_USE_MACROS
  47
  48 /*
  49  * erase --
  50  *      Erases everything on stdscr.
  51  */
  52 int
  53 erase(void)
  54 {
  55         return werase(stdscr);
  56 }
  57
  58 #endif
  59
  60 /*
  61  * werase --
  62  *      Erases everything on the window.
  63  */
  64 int
  65 werase(WINDOW *win)
  66 {
  67
  68         int     y;
  69         __LDATA *sp, *end, *start;
  70         attr_t  attr;
  71
  72 #ifdef DEBUG
  73         __CTRACE(__CTRACE_ERASE, "werase: (%p)\n", win);
  74 #endif
  75         if (win != curscr)
  76                 attr = win->battr & __ATTRIBUTES;
  77         else
  78                 attr = 0;
  79         for (y = 0; y < win->maxy; y++) {
  80                 start = win->alines[y]->line;
  81                 end = &start[win->maxx];
  82                 for (sp = start; sp < end; sp++)
  83 #ifndef HAVE_WCHAR
  84                         if (sp->ch != win->bch || sp->attr != 0) {
  85 #else
  86                         if (sp->ch != ( wchar_t )btowc(( int ) win->bch ) ||
  87                             (sp->attr & WA_ATTRIBUTES) != 0 || sp->nsp) {
  88 #endif /* HAVE_WCHAR */
  89                                 if (sp->attr & __ALTCHARSET)
  90                                         sp->attr = attr | __ALTCHARSET;
  91                                 else
  92                                         sp->attr = attr;
  93 #ifdef HAVE_WCHAR
  94                                 sp->ch = ( wchar_t )btowc(( int ) win->bch);
  95                                 if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
  96                                         return ERR;
  97                                 SET_WCOL( *sp, 1 );
  98 #else
  99                                 sp->ch = win->bch;
 100 #endif /* HAVE_WCHAR */
 101                         }
 102         }
 103         /*
 104          * Mark the whole window as changed in case we have overlapping
 105          * windows - this will result in the (intended) clearing of the
 106          * screen over the area covered by the window. */
 107         __touchwin(win);
 108         wmove(win, 0, 0);
 109         return (OK);
 110 }