1 /****************************************************************************
2 * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
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5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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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 *
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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>
44 MODULE_ID("$Id: lib_newwin.c,v 1.40 2007/03/10 18:18:59 tom Exp $")
47 remove_window_from_screen(WINDOW *win)
49 SCREEN **scan = &_nc_screen_chain;
53 if (sp->_curscr == win) {
59 } else if (sp->_stdscr == win) {
65 } else if (sp->_newscr == win) {
72 scan = &(*scan)->_next_screen;
82 _nc_freewin(WINDOW *win)
89 for (p = _nc_windows, q = 0; p != 0; q = p, p = p->next) {
90 if (&(p->win) == win) {
91 remove_window_from_screen(win);
93 _nc_windows = p->next;
97 if (!(win->_flags & _SUBWIN)) {
98 for (i = 0; i <= win->_maxy; i++)
99 FreeIfNeeded(win->_line[i].text);
105 T(("...deleted win=%p", win));
113 NCURSES_EXPORT(WINDOW *)
114 newwin(int num_lines, int num_columns, int begy, int begx)
120 T((T_CALLED("newwin(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx));
122 if (begy < 0 || begx < 0 || num_lines < 0 || num_columns < 0)
126 num_lines = SP->_lines_avail - begy;
127 if (num_columns == 0)
128 num_columns = screen_columns - begx;
130 if ((win = _nc_makenew(num_lines, num_columns, begy, begx, 0)) == 0)
133 for (i = 0; i < num_lines; i++) {
134 win->_line[i].text = typeCalloc(NCURSES_CH_T, (unsigned) num_columns);
135 if (win->_line[i].text == 0) {
136 (void) _nc_freewin(win);
139 for (ptr = win->_line[i].text;
140 ptr < win->_line[i].text + num_columns;
142 SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
148 NCURSES_EXPORT(WINDOW *)
149 derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx)
155 T((T_CALLED("derwin(%p,%d,%d,%d,%d)"), orig, num_lines, num_columns,
159 * make sure window fits inside the original one
161 if (begy < 0 || begx < 0 || orig == 0 || num_lines < 0 || num_columns < 0)
163 if (begy + num_lines > orig->_maxy + 1
164 || begx + num_columns > orig->_maxx + 1)
168 num_lines = orig->_maxy + 1 - begy;
170 if (num_columns == 0)
171 num_columns = orig->_maxx + 1 - begx;
173 if (orig->_flags & _ISPAD)
176 if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy,
177 orig->_begx + begx, flags)) == 0)
182 WINDOW_ATTRS(win) = WINDOW_ATTRS(orig);
183 win->_nc_bkgd = orig->_nc_bkgd;
185 for (i = 0; i < num_lines; i++)
186 win->_line[i].text = &orig->_line[begy++].text[begx];
193 NCURSES_EXPORT(WINDOW *)
194 subwin(WINDOW *w, int l, int c, int y, int x)
196 T((T_CALLED("subwin(%p, %d, %d, %d, %d)"), w, l, c, y, x));
197 T(("parent has begy = %ld, begx = %ld", (long) w->_begy, (long) w->_begx));
199 returnWin(derwin(w, l, c, y - w->_begy, x - w->_begx));
203 dimension_limit(int value)
205 NCURSES_SIZE_T test = value;
206 return (test == value && value > 0);
209 NCURSES_EXPORT(WINDOW *)
210 _nc_makenew(int num_lines, int num_columns, int begy, int begx, int flags)
215 bool is_pad = (flags & _ISPAD);
217 T((T_CALLED("_nc_makenew(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx));
222 if (!dimension_limit(num_lines) || !dimension_limit(num_columns))
225 if ((wp = typeCalloc(WINDOWLIST, 1)) == 0)
230 if ((win->_line = typeCalloc(struct ldat, ((unsigned) num_lines))) == 0) {
237 win->_maxy = num_lines - 1;
238 win->_maxx = num_columns - 1;
241 win->_yoffset = SP->_topstolen;
244 WINDOW_ATTRS(win) = A_NORMAL;
245 SetChar(win->_nc_bkgd, BLANK_TEXT, BLANK_ATTR);
247 win->_clear = is_pad ? FALSE : (num_lines == screen_lines
248 && num_columns == screen_columns);
251 win->_scroll = FALSE;
252 win->_leaveok = FALSE;
253 win->_use_keypad = FALSE;
262 win->_regbottom = num_lines - 1;
264 win->_pad._pad_y = -1;
265 win->_pad._pad_x = -1;
266 win->_pad._pad_top = -1;
267 win->_pad._pad_bottom = -1;
268 win->_pad._pad_left = -1;
269 win->_pad._pad_right = -1;
271 for (i = 0; i < num_lines; i++) {
275 * win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE;
277 * which marks the whole window unchanged. That's how
278 * SVr1 curses did it, but SVr4 curses marks the whole new
281 * With the old SVr1-like code, say you have stdscr full of
282 * characters, then create a new window with newwin(),
283 * then do a printw(win, "foo ");, the trailing spaces are
284 * completely ignored by the following refreshes. So, you
285 * get "foojunkjunk" on the screen instead of "foo " as
286 * you actually intended.
288 * SVr4 doesn't do this. Instead the spaces are actually written.
289 * So that's how we want ncurses to behave.
291 win->_line[i].firstchar = 0;
292 win->_line[i].lastchar = num_columns - 1;
294 if_USE_SCROLL_HINTS(win->_line[i].oldindex = i);
297 if (!is_pad && (begx + num_columns == screen_columns)) {
298 win->_flags |= _ENDLINE;
300 if (begx == 0 && num_lines == screen_lines && begy == 0)
301 win->_flags |= _FULLWIN;
303 if (begy + num_lines == screen_lines)
304 win->_flags |= _SCROLLWIN;
307 wp->next = _nc_windows;
310 T((T_CREATE("window %p"), win));