usr/src/lib/libcurses/screen/wdelch.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 #include        <sys/types.h>
  45 #include        "curses_inc.h"
  46
  47 /*
  48  * This routine performs a delete-char on the line,
  49  * leaving (_cury, _curx) unchanged.
  50  */
  51
  52 int
  53 wdelch(WINDOW *win)
  54 {
  55         chtype  *temp1, *temp2;
  56         chtype  *end;
  57         int     cury = win->_cury;
  58         short   curx = win->_curx;
  59         chtype  *cp;
  60         int     s;
  61
  62         end = &win->_y[cury][win->_maxx - 1];
  63         temp2 = &win->_y[cury][curx + 1];
  64         temp1 = temp2 - 1;
  65
  66         s = 1;
  67         win->_nbyte = -1;
  68         if (_scrmax > 1) {
  69                 if (ISMBIT(*temp1)) {
  70                         win->_insmode = TRUE;
  71                         if (_mbvalid(win) == ERR)
  72                                 return (ERR);
  73                         curx = win->_curx;
  74                         temp1 = &win->_y[cury][curx];
  75                 }
  76                 if (ISMBIT(*end)) {
  77                         for (cp = end; cp >= temp1; --cp)
  78                                 if (!ISCBIT(*cp))
  79                                         break;
  80                         if (cp + _curs_scrwidth[TYPE(*cp)] > end+1)
  81                                 end = cp - 1;
  82                 }
  83                 if (ISMBIT(*temp1))
  84                         s = _curs_scrwidth[TYPE(RBYTE(*temp1))];
  85                 end -= s - 1;
  86                 temp2 = &win->_y[cury][curx+s];
  87         }
  88
  89         while (temp1 < end)
  90                 *temp1++ = *temp2++;
  91
  92         while (s--)
  93                 *temp1++ = win->_bkgd;
  94
  95 #ifdef  _VR3_COMPAT_CODE
  96         if (_y16update)
  97                 (*_y16update)(win, 1, win->_maxx - curx, cury, curx);
  98 #endif  /* _VR3_COMPAT_CODE */
  99
 100         win->_lastch[cury] = win->_maxx - 1;
 101         if (win->_firstch[cury] > curx)
 102                 win->_firstch[cury] = curx;
 103
 104         win->_flags |= _WINCHANGED;
 105
 106         if (win->_sync)
 107                 wsyncup(win);
 108
 109         return (win->_immed ? wrefresh(win) : OK);
 110 }