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-rw-r--r--ncurses/base/wresize.c246
1 files changed, 246 insertions, 0 deletions
diff --git a/ncurses/base/wresize.c b/ncurses/base/wresize.c
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+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 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: Thomas E. Dickey 1996-2002 *
+ ****************************************************************************/
+
+#include <curses.priv.h>
+
+MODULE_ID("$Id: wresize.c,v 1.28 2008/05/03 14:13:51 tom Exp $")
+
+static int
+cleanup_lines(struct ldat *data, int length)
+{
+ while (--length >= 0)
+ free(data[length].text);
+ free(data);
+ return ERR;
+}
+
+/*
+ * If we have reallocated the ldat structs, we will have to repair pointers
+ * used in subwindows.
+ */
+static void
+repair_subwindows(WINDOW *cmp)
+{
+ WINDOWLIST *wp;
+ struct ldat *pline = cmp->_line;
+ int row;
+
+ _nc_lock_global(windowlist);
+
+ for (each_window(wp)) {
+ WINDOW *tst = &(wp->win);
+
+ if (tst->_parent == cmp) {
+
+ if (tst->_pary > cmp->_maxy)
+ tst->_pary = cmp->_maxy;
+ if (tst->_parx > cmp->_maxx)
+ tst->_parx = cmp->_maxx;
+
+ if (tst->_maxy + tst->_pary > cmp->_maxy)
+ tst->_maxy = cmp->_maxy - tst->_pary;
+ if (tst->_maxx + tst->_parx > cmp->_maxx)
+ tst->_maxx = cmp->_maxx - tst->_parx;
+
+ for (row = 0; row <= tst->_maxy; ++row) {
+ tst->_line[row].text = &pline[tst->_pary + row].text[tst->_parx];
+ }
+ repair_subwindows(tst);
+ }
+ }
+ _nc_unlock_global(windowlist);
+}
+
+/*
+ * Reallocate a curses WINDOW struct to either shrink or grow to the specified
+ * new lines/columns. If it grows, the new character cells are filled with
+ * blanks. The application is responsible for repainting the blank area.
+ */
+NCURSES_EXPORT(int)
+wresize(WINDOW *win, int ToLines, int ToCols)
+{
+ int col, row, size_x, size_y;
+ struct ldat *pline;
+ struct ldat *new_lines = 0;
+
+#ifdef TRACE
+ T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
+ if (win) {
+ TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
+ (long) win->_begy, (long) win->_begx,
+ (long) win->_maxy, (long) win->_maxx,
+ (long) win->_regtop, (long) win->_regbottom));
+ if (USE_TRACEF(TRACE_UPDATE)) {
+ _tracedump("...before", win);
+ _nc_unlock_global(tracef);
+ }
+ }
+#endif
+
+ if (!win || --ToLines < 0 || --ToCols < 0)
+ returnCode(ERR);
+
+ size_x = win->_maxx;
+ size_y = win->_maxy;
+
+ if (ToLines == size_y
+ && ToCols == size_x)
+ returnCode(OK);
+
+ if ((win->_flags & _SUBWIN)) {
+ /*
+ * Check if the new limits will fit into the parent window's size. If
+ * not, do not resize. We could adjust the location of the subwindow,
+ * but the application may not like that.
+ */
+ if (win->_pary + ToLines > win->_parent->_maxy
+ || win->_parx + ToCols > win->_parent->_maxx) {
+ returnCode(ERR);
+ }
+ pline = win->_parent->_line;
+ } else {
+ pline = 0;
+ }
+
+ /*
+ * Allocate new memory as needed. Do the allocations without modifying
+ * the original window, in case an allocation fails. Always allocate
+ * (at least temporarily) the array pointing to the individual lines.
+ */
+ new_lines = typeCalloc(struct ldat, (unsigned) (ToLines + 1));
+ if (new_lines == 0)
+ returnCode(ERR);
+
+ /*
+ * For each line in the target, allocate or adjust pointers for the
+ * corresponding text, depending on whether this is a window or a
+ * subwindow.
+ */
+ for (row = 0; row <= ToLines; ++row) {
+ int begin = (row > size_y) ? 0 : (size_x + 1);
+ int end = ToCols;
+ NCURSES_CH_T *s;
+
+ if (!(win->_flags & _SUBWIN)) {
+ if (row <= size_y) {
+ if (ToCols != size_x) {
+ if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
+ returnCode(cleanup_lines(new_lines, row));
+ for (col = 0; col <= ToCols; ++col) {
+ s[col] = (col <= size_x
+ ? win->_line[row].text[col]
+ : win->_nc_bkgd);
+ }
+ } else {
+ s = win->_line[row].text;
+ }
+ } else {
+ if ((s = typeMalloc(NCURSES_CH_T, ToCols + 1)) == 0)
+ returnCode(cleanup_lines(new_lines, row));
+ for (col = 0; col <= ToCols; ++col)
+ s[col] = win->_nc_bkgd;
+ }
+ } else {
+ s = &pline[win->_pary + row].text[win->_parx];
+ }
+
+ if_USE_SCROLL_HINTS(new_lines[row].oldindex = row);
+ if (row <= size_y) {
+ new_lines[row].firstchar = win->_line[row].firstchar;
+ new_lines[row].lastchar = win->_line[row].lastchar;
+ }
+ if ((ToCols != size_x) || (row > size_y)) {
+ if (end >= begin) { /* growing */
+ if (new_lines[row].firstchar < begin)
+ new_lines[row].firstchar = begin;
+ } else { /* shrinking */
+ new_lines[row].firstchar = 0;
+ }
+ new_lines[row].lastchar = ToCols;
+ }
+ new_lines[row].text = s;
+ }
+
+ /*
+ * Dispose of unwanted memory.
+ */
+ if (!(win->_flags & _SUBWIN)) {
+ if (ToCols == size_x) {
+ for (row = ToLines + 1; row <= size_y; row++) {
+ free(win->_line[row].text);
+ }
+ } else {
+ for (row = 0; row <= size_y; row++) {
+ free(win->_line[row].text);
+ }
+ }
+ }
+
+ free(win->_line);
+ win->_line = new_lines;
+
+ /*
+ * Finally, adjust the parameters showing screen size and cursor
+ * position:
+ */
+ win->_maxx = ToCols;
+ win->_maxy = ToLines;
+
+ if (win->_regtop > win->_maxy)
+ win->_regtop = win->_maxy;
+ if (win->_regbottom > win->_maxy
+ || win->_regbottom == size_y)
+ win->_regbottom = win->_maxy;
+
+ if (win->_curx > win->_maxx)
+ win->_curx = win->_maxx;
+ if (win->_cury > win->_maxy)
+ win->_cury = win->_maxy;
+
+ /*
+ * Check for subwindows of this one, and readjust pointers to our text,
+ * if needed.
+ */
+ repair_subwindows(win);
+
+#ifdef TRACE
+ TR(TRACE_UPDATE, ("...beg (%ld, %ld), max(%ld,%ld), reg(%ld,%ld)",
+ (long) win->_begy, (long) win->_begx,
+ (long) win->_maxy, (long) win->_maxx,
+ (long) win->_regtop, (long) win->_regbottom));
+ if (USE_TRACEF(TRACE_UPDATE)) {
+ _tracedump("...after:", win);
+ _nc_unlock_global(tracef);
+ }
+#endif
+ returnCode(OK);
+}