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lib_newwin.c

/****************************************************************************
 * Copyright (c) 1998-2001,2002 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
**    lib_newwin.c
**
**    The routines newwin(), subwin() and their dependent
**
*/

#include <curses.priv.h>

MODULE_ID("$Id: lib_newwin.c,v 1.34 2002/08/18 00:12:30 tom Exp $")

static WINDOW *
remove_window_from_screen(WINDOW *win)
{
    SCREEN **scan = &_nc_screen_chain;

    while (*scan) {
      SCREEN *sp = *scan;
      if (sp->_curscr == win) {
          sp->_curscr = 0;
          if (win == curscr)
            curscr = 0;
      } else if (sp->_stdscr == win) {
          sp->_stdscr = 0;
          if (win == stdscr)
            stdscr = 0;
      } else if (sp->_newscr == win) {
          sp->_newscr = 0;
          if (win == newscr)
            newscr = 0;
      } else {
          scan = &(*scan)->_next_screen;
          continue;
      }
      break;
    }

    return 0;
}

NCURSES_EXPORT(int)
_nc_freewin(WINDOW *win)
{
    WINDOWLIST *p, *q;
    int i;
    int result = ERR;

    if (win != 0) {
      for (p = _nc_windows, q = 0; p != 0; q = p, p = p->next) {
          if (&(p->win) == win) {
            remove_window_from_screen(win);
            if (q == 0)
                _nc_windows = p->next;
            else
                q->next = p->next;

            if (!(win->_flags & _SUBWIN)) {
                for (i = 0; i <= win->_maxy; i++)
                  FreeIfNeeded(win->_line[i].text);
            }
            free(win->_line);
            free(p);

            result = OK;
            T(("...deleted win=%p", win));
            break;
          }
      }
    }
    return result;
}

NCURSES_EXPORT(WINDOW *)
newwin(int num_lines, int num_columns, int begy, int begx)
{
    WINDOW *win;
    NCURSES_CH_T *ptr;
    int i;

    T((T_CALLED("newwin(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx));

    if (begy < 0 || begx < 0 || num_lines < 0 || num_columns < 0)
      returnWin(0);

    if (num_lines == 0)
      num_lines = SP->_lines_avail - begy;
    if (num_columns == 0)
      num_columns = screen_columns - begx;

    if (num_columns + begx > SP->_columns || num_lines + begy > SP->_lines_avail)
      returnWin(0);

    if ((win = _nc_makenew(num_lines, num_columns, begy, begx, 0)) == 0)
      returnWin(0);

    for (i = 0; i < num_lines; i++) {
      win->_line[i].text = typeCalloc(NCURSES_CH_T, (unsigned) num_columns);
      if (win->_line[i].text == 0) {
          (void) _nc_freewin(win);
          returnWin(0);
      }
      for (ptr = win->_line[i].text;
           ptr < win->_line[i].text + num_columns;
           ptr++)
          SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
    }

    returnWin(win);
}

NCURSES_EXPORT(WINDOW *)
derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx)
{
    WINDOW *win;
    int i;
    int flags = _SUBWIN;

    T((T_CALLED("derwin(%p,%d,%d,%d,%d)"), orig, num_lines, num_columns,
       begy, begx));

    /*
     * make sure window fits inside the original one
     */
    if (begy < 0 || begx < 0 || orig == 0 || num_lines < 0 || num_columns < 0)
      returnWin(0);
    if (begy + num_lines > orig->_maxy + 1
      || begx + num_columns > orig->_maxx + 1)
      returnWin(0);

    if (num_lines == 0)
      num_lines = orig->_maxy + 1 - begy;

    if (num_columns == 0)
      num_columns = orig->_maxx + 1 - begx;

    if (orig->_flags & _ISPAD)
      flags |= _ISPAD;

    if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy,
                     orig->_begx + begx, flags)) == 0)
      returnWin(0);

    win->_pary = begy;
    win->_parx = begx;
    win->_attrs = orig->_attrs;
    win->_nc_bkgd = orig->_nc_bkgd;

    for (i = 0; i < num_lines; i++)
      win->_line[i].text = &orig->_line[begy++].text[begx];

    win->_parent = orig;

    returnWin(win);
}

NCURSES_EXPORT(WINDOW *)
subwin(WINDOW *w, int l, int c, int y, int x)
{
    T((T_CALLED("subwin(%p, %d, %d, %d, %d)"), w, l, c, y, x));
    T(("parent has begy = %d, begx = %d", w->_begy, w->_begx));

    returnWin(derwin(w, l, c, y - w->_begy, x - w->_begx));
}

static bool
dimension_limit(int value)
{
    NCURSES_SIZE_T test = value;
    return (test == value && value > 0);
}

NCURSES_EXPORT(WINDOW *)
_nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags)
{
    int i;
    WINDOWLIST *wp;
    WINDOW *win;
    bool is_pad = (flags & _ISPAD);

    T(("_nc_makenew(%d,%d,%d,%d)", num_lines, num_columns, begy, begx));

    if (!dimension_limit(num_lines) || !dimension_limit(num_columns))
      return 0;

    if ((wp = typeCalloc(WINDOWLIST, 1)) == 0)
      return 0;

    win = &(wp->win);

    if ((win->_line = typeCalloc(struct ldat, ((unsigned) num_lines))) == 0) {
      free(win);
      return 0;
    }

    win->_curx = 0;
    win->_cury = 0;
    win->_maxy = num_lines - 1;
    win->_maxx = num_columns - 1;
    win->_begy = begy;
    win->_begx = begx;
    win->_yoffset = SP->_topstolen;

    win->_flags = flags;
    win->_attrs = A_NORMAL;
    SetChar(win->_nc_bkgd, BLANK_TEXT, BLANK_ATTR);

    win->_clear = is_pad ? FALSE : (num_lines == screen_lines
                            && num_columns == screen_columns);
    win->_idlok = FALSE;
    win->_idcok = TRUE;
    win->_scroll = FALSE;
    win->_leaveok = FALSE;
    win->_use_keypad = FALSE;
    win->_delay = -1;
    win->_immed = FALSE;
    win->_sync = 0;
    win->_parx = -1;
    win->_pary = -1;
    win->_parent = 0;

    win->_regtop = 0;
    win->_regbottom = num_lines - 1;

    win->_pad._pad_y = -1;
    win->_pad._pad_x = -1;
    win->_pad._pad_top = -1;
    win->_pad._pad_bottom = -1;
    win->_pad._pad_left = -1;
    win->_pad._pad_right = -1;

    for (i = 0; i < num_lines; i++) {
      /*
       * This used to do
       *
       * win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE;
       *
       * which marks the whole window unchanged.  That's how
       * SVr1 curses did it, but SVr4 curses marks the whole new
       * window changed.
       *
       * With the old SVr1-like code, say you have stdscr full of
       * characters, then create a new window with newwin(),
       * then do a printw(win, "foo        ");, the trailing spaces are
       * completely ignored by the following refreshes.  So, you
       * get "foojunkjunk" on the screen instead of "foo        " as
       * you actually intended.
       *
       * SVr4 doesn't do this.  Instead the spaces are actually written.
       * So that's how we want ncurses to behave.
       */
      win->_line[i].firstchar = 0;
      win->_line[i].lastchar = num_columns - 1;

      if_USE_SCROLL_HINTS(win->_line[i].oldindex = i);
    }

    if (!is_pad && (begx + num_columns == screen_columns)) {
      win->_flags |= _ENDLINE;

      if (begx == 0 && num_lines == screen_lines && begy == 0)
          win->_flags |= _FULLWIN;

      if (begy + num_lines == screen_lines)
          win->_flags |= _SCROLLWIN;
    }

    wp->next = _nc_windows;
    _nc_windows = wp;

    T((T_CREATE("window %p"), win));

    return (win);
}

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