/* $OpenBSD: wresize.c,v 1.6 2023/10/17 09:52:09 nicm Exp $ */ /**************************************************************************** * Copyright 2019-2020,2021 Thomas E. Dickey * * Copyright 1998-2010,2011 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-on * * and: Juergen Pfeifer * ****************************************************************************/ #include MODULE_ID("$Id: wresize.c,v 1.6 2023/10/17 09:52:09 nicm Exp $") static int cleanup_lines(struct ldat *data, int length) { while (--length >= 0) FreeAndNull(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; #ifdef USE_SP_WINDOWLIST SCREEN *sp = _nc_screen_of(cmp); #endif _nc_lock_global(curses); for (each_window(SP_PARM, wp)) { WINDOW *tst = &(wp->win); if (tst->_parent == cmp) { #define REPAIR1(field, limit) \ if (tst->field > cmp->limit) \ tst->field = cmp->limit REPAIR1(_pary, _maxy); REPAIR1(_parx, _maxx); #define REPAIR2(field, limit) \ if (tst->limit + tst->field > cmp->limit) \ tst->limit = (NCURSES_SIZE_T) (cmp->limit - tst->field) REPAIR2(_pary, _maxy); REPAIR2(_parx, _maxx); #define REPAIR3(field, limit) \ if (tst->field > tst->limit) \ tst->field = tst->limit REPAIR3(_cury, _maxy); REPAIR3(_curx, _maxx); REPAIR3(_regtop, _maxy); REPAIR3(_regbottom, _maxy); for (row = 0; row <= tst->_maxy; ++row) { tst->_line[row].text = &pline[tst->_pary + row].text[tst->_parx]; } repair_subwindows(tst); } } _nc_unlock_global(curses); } /* * 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)"), (void *) 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 (IS_SUBWIN(win)) { /* * 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 (!IS_SUBWIN(win)) { if (row <= size_y) { if (ToCols != size_x) { s = typeMalloc(NCURSES_CH_T, (unsigned) ToCols + 1); if (s == 0) returnCode(cleanup_lines(new_lines, row)); for (col = 0; col <= ToCols; ++col) { bool valid = (col <= size_x); if_WIDEC({ if (col == ToCols && col < size_x && isWidecBase(win->_line[row].text[col])) { valid = FALSE; } }); s[col] = (valid ? win->_line[row].text[col] : win->_nc_bkgd); } } else { s = win->_line[row].text; } } else { s = typeMalloc(NCURSES_CH_T, (unsigned) ToCols + 1); if (s == 0) returnCode(cleanup_lines(new_lines, row)); for (col = 0; col <= ToCols; ++col) s[col] = win->_nc_bkgd; } } else if (pline != 0 && pline[win->_pary + row].text != 0) { s = &pline[win->_pary + row].text[win->_parx]; } else { s = 0; } 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 = (NCURSES_SIZE_T) begin; } else { /* shrinking */ new_lines[row].firstchar = 0; } new_lines[row].lastchar = (NCURSES_SIZE_T) 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++) { FreeAndNull(win->_line[row].text); } } else { for (row = 0; row <= size_y; row++) { FreeAndNull(win->_line[row].text); } } } FreeAndNull(win->_line); win->_line = new_lines; /* * Finally, adjust the parameters showing screen size and cursor * position: */ win->_maxx = (NCURSES_SIZE_T) ToCols; win->_maxy = (NCURSES_SIZE_T) 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); }