lib/libcurses/delch.c

   1 /*      $NetBSD: delch.c,v 1.21 2007/10/06 18:31:33 martin 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[] = "@(#)delch.c     8.2 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: delch.c,v 1.21 2007/10/06 18:31:33 martin Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include <string.h>
  42 #include <stdlib.h>
  43
  44 #include "curses.h"
  45 #include "curses_private.h"
  46
  47 #ifndef _CURSES_USE_MACROS
  48 /*
  49  * delch --
  50  *      Do a delete-char on the line, leaving (cury, curx) unchanged.
  51  */
  52 int
  53 delch(void)
  54 {
  55         return wdelch(stdscr);
  56 }
  57
  58 /*
  59  * mvdelch --
  60  *      Do a delete-char on the line at (y, x) on stdscr.
  61  */
  62 int
  63 mvdelch(int y, int x)
  64 {
  65         return mvwdelch(stdscr, y, x);
  66 }
  67
  68 /*
  69  * mvwdelch --
  70  *      Do a delete-char on the line at (y, x) of the given window.
  71  */
  72 int
  73 mvwdelch(WINDOW *win, int y, int x)
  74 {
  75         if (wmove(win, y, x) == ERR)
  76                 return ERR;
  77
  78         return wdelch(win);
  79 }
  80
  81 #endif
  82
  83 /*
  84  * wdelch --
  85  *      Do a delete-char on the line, leaving (cury, curx) unchanged.
  86  */
  87 int
  88 wdelch(WINDOW *win)
  89 {
  90         __LDATA *end, *temp1, *temp2;
  91
  92 #ifndef HAVE_WCHAR
  93         end = &win->alines[win->cury]->line[win->maxx - 1];
  94         temp1 = &win->alines[win->cury]->line[win->curx];
  95         temp2 = temp1 + 1;
  96         while (temp1 < end) {
  97                 (void) memcpy(temp1, temp2, sizeof(__LDATA));
  98                 temp1++, temp2++;
  99         }
 100         temp1->ch = win->bch;
 101         if (__using_color && win != curscr)
 102                 temp1->attr = win->battr & __COLOR;
 103         else
 104                 temp1->attr = 0;
 105         __touchline(win, (int) win->cury, (int) win->curx, (int) win->maxx - 1);
 106         return (OK);
 107 #else
 108         int cw, sx;
 109         nschar_t *np, *tnp;
 110
 111         end = &win->alines[win->cury]->line[win->maxx - 1];
 112         sx = win->curx;
 113         temp1 = &win->alines[win->cury]->line[win->curx];
 114         cw = WCOL( *temp1 );
 115         if ( cw < 0 ) {
 116                 temp1 += cw;
 117                 sx += cw;
 118                 cw = WCOL( *temp1 );
 119         }
 120         np = temp1->nsp;
 121         if (np) {
 122                 while ( np ) {
 123                         tnp = np->next;
 124                         free( np );
 125                         np = tnp;
 126                 }
 127                 temp1->nsp = NULL;
 128         }
 129         if ( sx + cw < win->maxx ) {
 130                 temp2 = temp1 + cw;
 131                 while ( temp1 < end - ( cw - 1 )) {
 132                         ( void )memcpy( temp1, temp2, sizeof( __LDATA ));
 133                         temp1++, temp2++;
 134                 }
 135         }
 136         while ( temp1 <= end ) {
 137                 temp1->ch = ( wchar_t )btowc(( int ) win->bch );
 138                 temp1->attr = 0;
 139                 if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
 140                         return ERR;
 141                 SET_WCOL(*temp1, 1);
 142                 temp1++;
 143         }
 144         __touchline(win, (int) win->cury, sx, (int) win->maxx - 1);
 145         return (OK);
 146 #endif /* HAVE_WCHAR */
 147 }