1/****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
3 *                                                                          *
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      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
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:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
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,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
28
29/****************************************************************************
30 *  Author: Thomas E. Dickey 1996-2002                                      *
31 ****************************************************************************/
32
33#include <curses.priv.h>
34
35MODULE_ID("$Id: wresize.c,v 1.29 2008/06/07 13:59:01 tom Exp $")
36
37static int
38cleanup_lines(struct ldat *data, int length)
39{
40    while (--length >= 0)
41	free(data[length].text);
42    free(data);
43    return ERR;
44}
45
46/*
47 * If we have reallocated the ldat structs, we will have to repair pointers
48 * used in subwindows.
49 */
50static void
51repair_subwindows(WINDOW *cmp)
52{
53    WINDOWLIST *wp;
54    struct ldat *pline = cmp->_line;
55    int row;
56
57    _nc_lock_global(curses);
58
59    for (each_window(wp)) {
60	WINDOW *tst = &(wp->win);
61
62	if (tst->_parent == cmp) {
63
64	    if (tst->_pary > cmp->_maxy)
65		tst->_pary = cmp->_maxy;
66	    if (tst->_parx > cmp->_maxx)
67		tst->_parx = cmp->_maxx;
68
69	    if (tst->_maxy + tst->_pary > cmp->_maxy)
70		tst->_maxy = cmp->_maxy - tst->_pary;
71	    if (tst->_maxx + tst->_parx > cmp->_maxx)
72		tst->_maxx = cmp->_maxx - tst->_parx;
73
74	    for (row = 0; row <= tst->_maxy; ++row) {
75		tst->_line[row].text = &pline[tst->_pary + row].text[tst->_parx];
76	    }
77	    repair_subwindows(tst);
78	}
79    }
80    _nc_unlock_global(curses);
81}
82
83/*
84 * Reallocate a curses WINDOW struct to either shrink or grow to the specified
85 * new lines/columns.  If it grows, the new character cells are filled with
86 * blanks.  The application is responsible for repainting the blank area.
87 */
88NCURSES_EXPORT(int)
89wresize(WINDOW *win, int ToLines, int ToCols)
90{
91    int col, row, size_x, size_y;
92    struct ldat *pline;
93    struct ldat *new_lines = 0;
94
95#ifdef TRACE
96    T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
97    if (win) {
98	TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
99			  (long) win->_begy, (long) win->_begx,
100			  (long) win->_maxy, (long) win->_maxx,
101			  (long) win->_regtop, (long) win->_regbottom));
102	if (USE_TRACEF(TRACE_UPDATE)) {
103	    _tracedump("...before", win);
104	    _nc_unlock_global(tracef);
105	}
106    }
107#endif
108
109    if (!win || --ToLines < 0 || --ToCols < 0)
110	returnCode(ERR);
111
112    size_x = win->_maxx;
113    size_y = win->_maxy;
114
115    if (ToLines == size_y
116	&& ToCols == size_x)
117	returnCode(OK);
118
119    if ((win->_flags & _SUBWIN)) {
120	/*
121	 * Check if the new limits will fit into the parent window's size.  If
122	 * not, do not resize.  We could adjust the location of the subwindow,
123	 * but the application may not like that.
124	 */
125	if (win->_pary + ToLines > win->_parent->_maxy
126	    || win->_parx + ToCols > win->_parent->_maxx) {
127	    returnCode(ERR);
128	}
129	pline = win->_parent->_line;
130    } else {
131	pline = 0;
132    }
133
134    /*
135     * Allocate new memory as needed.  Do the allocations without modifying
136     * the original window, in case an allocation fails.  Always allocate
137     * (at least temporarily) the array pointing to the individual lines.
138     */
139    new_lines = typeCalloc(struct ldat, (unsigned) (ToLines + 1));
140    if (new_lines == 0)
141	returnCode(ERR);
142
143    /*
144     * For each line in the target, allocate or adjust pointers for the
145     * corresponding text, depending on whether this is a window or a
146     * subwindow.
147     */
148    for (row = 0; row <= ToLines; ++row) {
149	int begin = (row > size_y) ? 0 : (size_x + 1);
150	int end = ToCols;
151	NCURSES_CH_T *s;
152
153	if (!(win->_flags & _SUBWIN)) {
154	    if (row <= size_y) {
155		if (ToCols != size_x) {
156		    if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
157			returnCode(cleanup_lines(new_lines, row));
158		    for (col = 0; col <= ToCols; ++col) {
159			s[col] = (col <= size_x
160				  ? win->_line[row].text[col]
161				  : win->_nc_bkgd);
162		    }
163		} else {
164		    s = win->_line[row].text;
165		}
166	    } else {
167		if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
168		    returnCode(cleanup_lines(new_lines, row));
169		for (col = 0; col <= ToCols; ++col)
170		    s[col] = win->_nc_bkgd;
171	    }
172	} else {
173	    s = &pline[win->_pary + row].text[win->_parx];
174	}
175
176	if_USE_SCROLL_HINTS(new_lines[row].oldindex = row);
177	if (row <= size_y) {
178	    new_lines[row].firstchar = win->_line[row].firstchar;
179	    new_lines[row].lastchar = win->_line[row].lastchar;
180	}
181	if ((ToCols != size_x) || (row > size_y)) {
182	    if (end >= begin) {	/* growing */
183		if (new_lines[row].firstchar < begin)
184		    new_lines[row].firstchar = begin;
185	    } else {		/* shrinking */
186		new_lines[row].firstchar = 0;
187	    }
188	    new_lines[row].lastchar = ToCols;
189	}
190	new_lines[row].text = s;
191    }
192
193    /*
194     * Dispose of unwanted memory.
195     */
196    if (!(win->_flags & _SUBWIN)) {
197	if (ToCols == size_x) {
198	    for (row = ToLines + 1; row <= size_y; row++) {
199		free(win->_line[row].text);
200	    }
201	} else {
202	    for (row = 0; row <= size_y; row++) {
203		free(win->_line[row].text);
204	    }
205	}
206    }
207
208    free(win->_line);
209    win->_line = new_lines;
210
211    /*
212     * Finally, adjust the parameters showing screen size and cursor
213     * position:
214     */
215    win->_maxx = ToCols;
216    win->_maxy = ToLines;
217
218    if (win->_regtop > win->_maxy)
219	win->_regtop = win->_maxy;
220    if (win->_regbottom > win->_maxy
221	|| win->_regbottom == size_y)
222	win->_regbottom = win->_maxy;
223
224    if (win->_curx > win->_maxx)
225	win->_curx = win->_maxx;
226    if (win->_cury > win->_maxy)
227	win->_cury = win->_maxy;
228
229    /*
230     * Check for subwindows of this one, and readjust pointers to our text,
231     * if needed.
232     */
233    repair_subwindows(win);
234
235#ifdef TRACE
236    TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
237		      (long) win->_begy, (long) win->_begx,
238		      (long) win->_maxy, (long) win->_maxx,
239		      (long) win->_regtop, (long) win->_regbottom));
240    if (USE_TRACEF(TRACE_UPDATE)) {
241	_tracedump("...after:", win);
242	_nc_unlock_global(tracef);
243    }
244#endif
245    returnCode(OK);
246}
247