GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcurses/base/resizeterm.c Lines: 0 117 0.0 %
Date: 2017-11-07 Branches: 0 118 0.0 %

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/* $OpenBSD: resizeterm.c,v 1.3 2010/01/12 23:22:06 nicm Exp $ */
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/****************************************************************************
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 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
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 *                                                                          *
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 * Permission is hereby granted, free of charge, to any person obtaining a  *
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 * copy of this software and associated documentation files (the            *
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 * "Software"), to deal in the Software without restriction, including      *
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 * without limitation the rights to use, copy, modify, merge, publish,      *
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 * distribute, distribute with modifications, sublicense, and/or sell       *
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 * copies of the Software, and to permit persons to whom the Software is    *
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 * furnished to do so, subject to the following conditions:                 *
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 *                                                                          *
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 * The above copyright notice and this permission notice shall be included  *
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 * in all copies or substantial portions of the Software.                   *
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 *                                                                          *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
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 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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 *                                                                          *
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 * Except as contained in this notice, the name(s) of the above copyright   *
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 * holders shall not be used in advertising or otherwise to promote the     *
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 * sale, use or other dealings in this Software without prior written       *
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 * authorization.                                                           *
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 ****************************************************************************/
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/****************************************************************************
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 *  Author: Thomas E. Dickey                                                *
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 ****************************************************************************/
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/*
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 * This is an extension to the curses library.  It provides callers with a hook
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 * into the NCURSES data to resize windows, primarily for use by programs
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 * running in an X Window terminal (e.g., xterm).  I abstracted this module
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 * from my application library for NCURSES because it must be compiled with
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 * the private data structures -- T.Dickey 1995/7/4.
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 */
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#include <curses.priv.h>
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#include <term.h>
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MODULE_ID("$Id: resizeterm.c,v 1.3 2010/01/12 23:22:06 nicm Exp $")
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#define stolen_lines (screen_lines - SP->_lines_avail)
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/*
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 * If we're trying to be reentrant, do not want any local statics.
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 */
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#if USE_REENTRANT
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#define EXTRA_ARGS ,     CurLines,     CurCols
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#define EXTRA_DCLS , int CurLines, int CurCols
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#else
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static int current_lines;
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static int current_cols;
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#define CurLines current_lines
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#define CurCols  current_cols
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#define EXTRA_ARGS		/* nothing */
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#define EXTRA_DCLS		/* nothing */
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#endif
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#ifdef TRACE
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static void
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show_window_sizes(const char *name)
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{
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    WINDOWLIST *wp;
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    _nc_lock_global(curses);
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    _tracef("%s resizing: %2d x %2d (%2d x %2d)", name, LINES, COLS,
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	    screen_lines, screen_columns);
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    for (each_window(wp)) {
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	_tracef("  window %p is %2ld x %2ld at %2ld,%2ld",
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		&(wp->win),
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		(long) wp->win._maxy + 1,
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		(long) wp->win._maxx + 1,
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		(long) wp->win._begy,
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		(long) wp->win._begx);
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    }
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    _nc_unlock_global(curses);
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}
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#endif
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/*
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 * Return true if the given dimensions do not match the internal terminal
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 * structure's size.
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 */
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NCURSES_EXPORT(bool)
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is_term_resized(int ToLines, int ToCols)
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{
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    T((T_CALLED("is_term_resized(%d, %d)"), ToLines, ToCols));
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    returnCode(ToLines > 0
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	       && ToCols > 0
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	       && (ToLines != screen_lines
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		   || ToCols != screen_columns));
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}
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/*
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 */
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static ripoff_t *
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ripped_window(WINDOW *win)
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{
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    ripoff_t *result = 0;
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    ripoff_t *rop;
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    if (win != 0) {
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	for (each_ripoff(rop)) {
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	    if (rop->win == win && rop->line != 0) {
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		result = rop;
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		break;
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	    }
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	}
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    }
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    return result;
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}
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/*
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 * Returns the number of lines from the bottom for the beginning of a ripped
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 * off window.
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 */
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static int
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ripped_bottom(WINDOW *win)
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{
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    int result = 0;
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    ripoff_t *rop;
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    if (win != 0) {
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	for (each_ripoff(rop)) {
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	    if (rop->line < 0) {
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		result -= rop->line;
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		if (rop->win == win) {
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		    break;
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		}
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	    }
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	}
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    }
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    return result;
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}
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/*
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 * Return the number of levels of child-windows under the current window.
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 */
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static int
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child_depth(WINDOW *cmp)
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{
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    int depth = 0;
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    if (cmp != 0) {
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	WINDOWLIST *wp;
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	for (each_window(wp)) {
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	    WINDOW *tst = &(wp->win);
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	    if (tst->_parent == cmp) {
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		depth = 1 + child_depth(tst);
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		break;
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	    }
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	}
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    }
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    return depth;
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}
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/*
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 * Return the number of levels of parent-windows above the current window.
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 */
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static int
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parent_depth(WINDOW *cmp)
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{
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    int depth = 0;
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    if (cmp != 0) {
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	WINDOW *tst;
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	while ((tst = cmp->_parent) != 0) {
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	    ++depth;
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	    cmp = tst;
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	}
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    }
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    return depth;
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}
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/*
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 * FIXME: must adjust position so it's within the parent!
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 */
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static int
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adjust_window(WINDOW *win, int ToLines, int ToCols, int stolen EXTRA_DCLS)
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{
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    int result;
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    int bottom = CurLines + SP->_topstolen - stolen;
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    int myLines = win->_maxy + 1;
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    int myCols = win->_maxx + 1;
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    ripoff_t *rop = ripped_window(win);
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    T((T_CALLED("adjust_window(%p,%d,%d)%s depth %d/%d currently %ldx%ld at %ld,%ld"),
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       win, ToLines, ToCols,
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       (rop != 0) ? " (rip)" : "",
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       parent_depth(win),
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       child_depth(win),
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       (long) getmaxy(win), (long) getmaxx(win),
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       (long) getbegy(win) + win->_yoffset, (long) getbegx(win)));
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    if (rop != 0 && rop->line < 0) {
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	/*
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	 * If it is a ripped-off window at the bottom of the screen, simply
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	 * move it to the same relative position.
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	 */
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	win->_begy = ToLines - ripped_bottom(win) - 0 - win->_yoffset;
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    } else if (win->_begy >= bottom) {
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	/*
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	 * If it is below the bottom of the new screen, move up by the same
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	 * amount that the screen shrank.
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	 */
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	win->_begy += (ToLines - CurLines);
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    } else {
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	if (myLines == (CurLines - stolen)
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	    && ToLines != CurLines) {
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	    myLines = ToLines - stolen;
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	} else if (myLines == CurLines
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		   && ToLines != CurLines) {
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	    myLines = ToLines;
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	}
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    }
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    if (myLines > ToLines) {
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	myLines = ToLines;
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    }
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    if (myCols > ToCols)
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	myCols = ToCols;
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    if (myCols == CurCols
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	&& ToCols != CurCols)
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	myCols = ToCols;
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    result = wresize(win, myLines, myCols);
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    returnCode(result);
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}
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/*
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 * If we're decreasing size, recursively search for windows that have no
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 * children, decrease those to fit, then decrease the containing window, etc.
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 */
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static int
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decrease_size(int ToLines, int ToCols, int stolen EXTRA_DCLS)
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{
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    bool found;
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    int depth = 0;
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    WINDOWLIST *wp;
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    T((T_CALLED("decrease_size(%d, %d)"), ToLines, ToCols));
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    do {
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	found = FALSE;
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	TR(TRACE_UPDATE, ("decreasing size of windows to %dx%d, depth=%d",
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			  ToLines, ToCols, depth));
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	for (each_window(wp)) {
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	    WINDOW *win = &(wp->win);
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	    if (!(win->_flags & _ISPAD)) {
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		if (child_depth(win) == depth) {
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		    found = TRUE;
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		    if (adjust_window(win, ToLines, ToCols,
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				      stolen EXTRA_ARGS) != OK)
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			returnCode(ERR);
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		}
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	    }
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	}
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	++depth;
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    } while (found);
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    returnCode(OK);
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}
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/*
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 * If we're increasing size, recursively search for windows that have no
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 * parent, increase those to fit, then increase the contained window, etc.
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 */
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static int
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increase_size(int ToLines, int ToCols, int stolen EXTRA_DCLS)
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{
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    bool found;
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    int depth = 0;
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    WINDOWLIST *wp;
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    T((T_CALLED("increase_size(%d, %d)"), ToLines, ToCols));
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    do {
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	found = FALSE;
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	TR(TRACE_UPDATE, ("increasing size of windows to %dx%d, depth=%d",
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			  ToLines, ToCols, depth));
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	for (each_window(wp)) {
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	    WINDOW *win = &(wp->win);
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	    if (!(win->_flags & _ISPAD)) {
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		if (parent_depth(win) == depth) {
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		    found = TRUE;
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		    if (adjust_window(win, ToLines, ToCols,
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				      stolen EXTRA_ARGS) != OK)
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			returnCode(ERR);
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		}
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	    }
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	}
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	++depth;
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    } while (found);
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    returnCode(OK);
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}
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/*
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 * This function reallocates NCURSES window structures, with no side-effects
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 * such as ungetch().
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 */
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NCURSES_EXPORT(int)
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resize_term(int ToLines, int ToCols)
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{
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    int result = OK EXTRA_ARGS;
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    int was_stolen;
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    T((T_CALLED("resize_term(%d,%d) old(%d,%d)"),
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       ToLines, ToCols,
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       screen_lines, screen_columns));
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    if (SP == 0) {
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	returnCode(ERR);
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    }
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    _nc_lock_global(curses);
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    was_stolen = (screen_lines - SP->_lines_avail);
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    if (is_term_resized(ToLines, ToCols)) {
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	int myLines = CurLines = screen_lines;
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	int myCols = CurCols = screen_columns;
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#ifdef TRACE
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	if (USE_TRACEF(TRACE_UPDATE)) {
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	    show_window_sizes("before");
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	    _nc_unlock_global(tracef);
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	}
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#endif
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	if (ToLines > screen_lines) {
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	    increase_size(myLines = ToLines, myCols, was_stolen EXTRA_ARGS);
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	    CurLines = myLines;
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	    CurCols = myCols;
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	}
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	if (ToCols > screen_columns) {
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	    increase_size(myLines, myCols = ToCols, was_stolen EXTRA_ARGS);
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	    CurLines = myLines;
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	    CurCols = myCols;
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	}
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	if (ToLines < myLines ||
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	    ToCols < myCols) {
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	    decrease_size(ToLines, ToCols, was_stolen EXTRA_ARGS);
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	}
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	screen_lines = lines = ToLines;
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	screen_columns = columns = ToCols;
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	SP->_lines_avail = lines - was_stolen;
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	if (SP->oldhash) {
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	    FreeAndNull(SP->oldhash);
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	}
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	if (SP->newhash) {
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	    FreeAndNull(SP->newhash);
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	}
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#ifdef TRACE
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	if (USE_TRACEF(TRACE_UPDATE)) {
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	    SET_LINES(ToLines - was_stolen);
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	    SET_COLS(ToCols);
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	    show_window_sizes("after");
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	    _nc_unlock_global(tracef);
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	}
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#endif
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    }
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    /*
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     * Always update LINES, to allow for call from lib_doupdate.c which
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     * needs to have the count adjusted by the stolen (ripped off) lines.
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     */
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    SET_LINES(ToLines - was_stolen);
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    SET_COLS(ToCols);
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    _nc_unlock_global(curses);
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    returnCode(result);
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}
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/*
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 * This function reallocates NCURSES window structures.  It is invoked in
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 * response to a SIGWINCH interrupt.  Other user-defined windows may also need
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 * to be reallocated.
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 *
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 * Because this performs memory allocation, it should not (in general) be
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 * invoked directly from the signal handler.
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 */
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NCURSES_EXPORT(int)
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resizeterm(int ToLines, int ToCols)
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{
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    int result = ERR;
400
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    T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"),
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       ToLines, ToCols,
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       screen_lines, screen_columns));
404
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    if (SP != 0) {
406
	result = OK;
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	SP->_sig_winch = FALSE;
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409
	if (is_term_resized(ToLines, ToCols)) {
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#if USE_SIGWINCH
411
	    ripoff_t *rop;
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	    bool slk_visible = (SP != 0
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				&& SP->_slk != 0
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				&& !(SP->_slk->hidden));
415
416
	    if (slk_visible) {
417
		slk_clear();
418
	    }
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#endif
420
	    result = resize_term(ToLines, ToCols);
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422
#if USE_SIGWINCH
423
	    _nc_ungetch(SP, KEY_RESIZE);	/* so application can know this */
424
	    clearok(curscr, TRUE);	/* screen contents are unknown */
425
426
	    /* ripped-off lines are a special case: if we did not lengthen
427
	     * them, we haven't moved them either.  repaint them, too.
428
	     *
429
	     * for the rest - stdscr and other windows - the client has to
430
	     * decide which to repaint, since without panels, ncurses does
431
	     * not know which are really on top.
432
	     */
433
	    for (each_ripoff(rop)) {
434
		if (rop->win != stdscr
435
		    && rop->win != 0
436
		    && rop->line < 0) {
437
438
		    if (rop->hook != _nc_slk_initialize) {
439
			touchwin(rop->win);
440
			wnoutrefresh(rop->win);
441
		    }
442
		}
443
	    }
444
445
	    /* soft-keys are a special case: we _know_ how to repaint them */
446
	    if (slk_visible) {
447
		slk_restore();
448
		slk_touch();
449
450
		slk_refresh();
451
	    }
452
#endif
453
	}
454
    }
455
456
    returnCode(result);
457
}