1 /****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 * and: Thomas E. Dickey 1996-on *
33 ****************************************************************************/
38 ** The routines newwin(), subwin() and their dependent
42 #include <curses.priv.h>
45 MODULE_ID("$Id: lib_newwin.c,v 1.50 2008/05/03 16:36:39 tom Exp $")
47 #define window_is(name) ((sp)->_##name == win)
50 #define remove_window(name) \
53 #define remove_window(name) \
60 remove_window_from_screen(WINDOW *win)
64 for (each_screen(sp)) {
65 if (window_is(curscr)) {
66 remove_window(curscr);
68 } else if (window_is(stdscr)) {
69 remove_window(stdscr);
71 } else if (window_is(newscr)) {
72 remove_window(newscr);
79 _nc_freewin(WINDOW *win)
85 T((T_CALLED("_nc_freewin(%p)"), win));
88 if (_nc_try_global(windowlist) == 0) {
90 for (each_window(p)) {
91 if (&(p->win) == win) {
92 remove_window_from_screen(win);
94 _nc_windows = p->next;
98 if (!(win->_flags & _SUBWIN)) {
99 for (i = 0; i <= win->_maxy; i++)
100 FreeIfNeeded(win->_line[i].text);
106 T(("...deleted win=%p", win));
111 _nc_unlock_global(windowlist);
117 NCURSES_EXPORT(WINDOW *)
118 newwin(int num_lines, int num_columns, int begy, int begx)
124 T((T_CALLED("newwin(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx));
126 if (begy < 0 || begx < 0 || num_lines < 0 || num_columns < 0)
130 num_lines = SP->_lines_avail - begy;
131 if (num_columns == 0)
132 num_columns = screen_columns - begx;
134 if ((win = _nc_makenew(num_lines, num_columns, begy, begx, 0)) == 0)
137 for (i = 0; i < num_lines; i++) {
138 win->_line[i].text = typeCalloc(NCURSES_CH_T, (unsigned) num_columns);
139 if (win->_line[i].text == 0) {
140 (void) _nc_freewin(win);
143 for (ptr = win->_line[i].text;
144 ptr < win->_line[i].text + num_columns;
146 SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
152 NCURSES_EXPORT(WINDOW *)
153 derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx)
159 T((T_CALLED("derwin(%p,%d,%d,%d,%d)"), orig, num_lines, num_columns,
163 * make sure window fits inside the original one
165 if (begy < 0 || begx < 0 || orig == 0 || num_lines < 0 || num_columns < 0)
167 if (begy + num_lines > orig->_maxy + 1
168 || begx + num_columns > orig->_maxx + 1)
172 num_lines = orig->_maxy + 1 - begy;
174 if (num_columns == 0)
175 num_columns = orig->_maxx + 1 - begx;
177 if (orig->_flags & _ISPAD)
180 if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy,
181 orig->_begx + begx, flags)) == 0)
186 WINDOW_ATTRS(win) = WINDOW_ATTRS(orig);
187 win->_nc_bkgd = orig->_nc_bkgd;
189 for (i = 0; i < num_lines; i++)
190 win->_line[i].text = &orig->_line[begy++].text[begx];
197 NCURSES_EXPORT(WINDOW *)
198 subwin(WINDOW *w, int l, int c, int y, int x)
200 T((T_CALLED("subwin(%p, %d, %d, %d, %d)"), w, l, c, y, x));
201 T(("parent has begy = %ld, begx = %ld", (long) w->_begy, (long) w->_begx));
203 returnWin(derwin(w, l, c, y - w->_begy, x - w->_begx));
207 dimension_limit(int value)
209 NCURSES_SIZE_T test = value;
210 return (test == value && value > 0);
213 NCURSES_EXPORT(WINDOW *)
214 _nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags)
219 bool is_pad = (flags & _ISPAD);
221 T((T_CALLED("_nc_makenew(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx));
226 if (!dimension_limit(num_lines) || !dimension_limit(num_columns))
229 if ((wp = typeCalloc(WINDOWLIST, 1)) == 0)
232 _nc_mutex_init(&(wp->mutex_use_window));
236 if ((win->_line = typeCalloc(struct ldat, ((unsigned) num_lines))) == 0) {
241 _nc_lock_global(windowlist);
245 win->_maxy = num_lines - 1;
246 win->_maxx = num_columns - 1;
249 win->_yoffset = SP->_topstolen;
252 WINDOW_ATTRS(win) = A_NORMAL;
253 SetChar(win->_nc_bkgd, BLANK_TEXT, BLANK_ATTR);
255 win->_clear = is_pad ? FALSE : (num_lines == screen_lines
256 && num_columns == screen_columns);
259 win->_scroll = FALSE;
260 win->_leaveok = FALSE;
261 win->_use_keypad = FALSE;
270 win->_regbottom = num_lines - 1;
272 win->_pad._pad_y = -1;
273 win->_pad._pad_x = -1;
274 win->_pad._pad_top = -1;
275 win->_pad._pad_bottom = -1;
276 win->_pad._pad_left = -1;
277 win->_pad._pad_right = -1;
279 for (i = 0; i < num_lines; i++) {
283 * win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE;
285 * which marks the whole window unchanged. That's how
286 * SVr1 curses did it, but SVr4 curses marks the whole new
289 * With the old SVr1-like code, say you have stdscr full of
290 * characters, then create a new window with newwin(),
291 * then do a printw(win, "foo ");, the trailing spaces are
292 * completely ignored by the following refreshes. So, you
293 * get "foojunkjunk" on the screen instead of "foo " as
294 * you actually intended.
296 * SVr4 doesn't do this. Instead the spaces are actually written.
297 * So that's how we want ncurses to behave.
299 win->_line[i].firstchar = 0;
300 win->_line[i].lastchar = num_columns - 1;
302 if_USE_SCROLL_HINTS(win->_line[i].oldindex = i);
305 if (!is_pad && (begx + num_columns == screen_columns)) {
306 win->_flags |= _ENDLINE;
308 if (begx == 0 && num_lines == screen_lines && begy == 0)
309 win->_flags |= _FULLWIN;
311 if (begy + num_lines == screen_lines)
312 win->_flags |= _SCROLLWIN;
315 wp->next = _nc_windows;
318 T((T_CREATE("window %p"), win));
320 _nc_unlock_global(windowlist);