ncurses-5.7/ncurses/base/lib_screen.c

/****************************************************************************
 * 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    *
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 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
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 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
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 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 *     and: Thomas E. Dickey                        1996 on                 *
 ****************************************************************************/

#include <curses.priv.h>

MODULE_ID("$Id: lib_screen.c,v 1.31 2008/08/16 19:05:37 tom Exp $")

#define MAX_SIZE 0x3fff		/* 16k is big enough for a window or pad */

NCURSES_EXPORT(WINDOW *)
getwin(FILE *filep)
{
    WINDOW tmp, *nwin;
    int n;

    T((T_CALLED("getwin(%p)"), filep));

    clearerr(filep);
    (void) fread(&tmp, sizeof(WINDOW), 1, filep);
    if (ferror(filep)
	|| tmp._maxy == 0
	|| tmp._maxy > MAX_SIZE
	|| tmp._maxx == 0
	|| tmp._maxx > MAX_SIZE)
	returnWin(0);

    if (tmp._flags & _ISPAD) {
	nwin = newpad(tmp._maxy + 1, tmp._maxx + 1);
    } else {
	nwin = newwin(tmp._maxy + 1, tmp._maxx + 1, 0, 0);
    }

    /*
     * We deliberately do not restore the _parx, _pary, or _parent
     * fields, because the window hierarchy within which they
     * made sense is probably gone.
     */
    if (nwin != 0) {
	nwin->_curx = tmp._curx;
	nwin->_cury = tmp._cury;
	nwin->_maxy = tmp._maxy;
	nwin->_maxx = tmp._maxx;
	nwin->_begy = tmp._begy;
	nwin->_begx = tmp._begx;
	nwin->_yoffset = tmp._yoffset;
	nwin->_flags = tmp._flags & ~(_SUBWIN);

	WINDOW_ATTRS(nwin) = WINDOW_ATTRS(&tmp);
	nwin->_nc_bkgd = tmp._nc_bkgd;

	nwin->_notimeout = tmp._notimeout;
	nwin->_clear = tmp._clear;
	nwin->_leaveok = tmp._leaveok;
	nwin->_idlok = tmp._idlok;
	nwin->_idcok = tmp._idcok;
	nwin->_immed = tmp._immed;
	nwin->_scroll = tmp._scroll;
	nwin->_sync = tmp._sync;
	nwin->_use_keypad = tmp._use_keypad;
	nwin->_delay = tmp._delay;

	nwin->_regtop = tmp._regtop;
	nwin->_regbottom = tmp._regbottom;

	if (tmp._flags & _ISPAD)
	    nwin->_pad = tmp._pad;

	for (n = 0; n <= nwin->_maxy; n++) {
	    clearerr(filep);
	    (void) fread(nwin->_line[n].text,
			 sizeof(NCURSES_CH_T),
			 (size_t) (nwin->_maxx + 1),
			 filep);
	    if (ferror(filep)) {
		delwin(nwin);
		returnWin(0);
	    }
	}
	touchwin(nwin);
    }
    returnWin(nwin);
}

NCURSES_EXPORT(int)
putwin(WINDOW *win, FILE *filep)
{
    int code = ERR;
    int n;

    T((T_CALLED("putwin(%p,%p)"), win, filep));

    if (win != 0) {
	size_t len = (size_t) (win->_maxx + 1);

	clearerr(filep);
	if (fwrite(win, sizeof(WINDOW), 1, filep) != 1
	    || ferror(filep))
	      returnCode(code);

	for (n = 0; n <= win->_maxy; n++) {
	    if (fwrite(win->_line[n].text,
		       sizeof(NCURSES_CH_T), len, filep) != len
		|| ferror(filep)) {
		returnCode(code);
	    }
	}
	code = OK;
    }
    returnCode(code);
}

NCURSES_EXPORT(int)
scr_restore(const char *file)
{
    FILE *fp = 0;

    T((T_CALLED("scr_restore(%s)"), _nc_visbuf(file)));

    if (_nc_access(file, R_OK) < 0
	|| (fp = fopen(file, "rb")) == 0) {
	returnCode(ERR);
    } else {
	delwin(newscr);
	SP->_newscr = getwin(fp);
#if !USE_REENTRANT
	newscr = SP->_newscr;
#endif
	(void) fclose(fp);
	returnCode(OK);
    }
}

NCURSES_EXPORT(int)
scr_dump(const char *file)
{
    FILE *fp = 0;

    T((T_CALLED("scr_dump(%s)"), _nc_visbuf(file)));

    if (_nc_access(file, W_OK) < 0
	|| (fp = fopen(file, "wb")) == 0) {
	returnCode(ERR);
    } else {
	(void) putwin(newscr, fp);
	(void) fclose(fp);
	returnCode(OK);
    }
}

NCURSES_EXPORT(int)
scr_init(const char *file)
{
    FILE *fp = 0;

    T((T_CALLED("scr_init(%s)"), _nc_visbuf(file)));

    if (exit_ca_mode && non_rev_rmcup)
	returnCode(ERR);

    if (_nc_access(file, R_OK) < 0
	|| (fp = fopen(file, "rb")) == 0) {
	returnCode(ERR);
    } else {
	delwin(curscr);
	SP->_curscr = getwin(fp);
#if !USE_REENTRANT
	curscr = SP->_curscr;
#endif
	(void) fclose(fp);
	returnCode(OK);
    }
}

NCURSES_EXPORT(int)
scr_set(const char *file)
{
    T((T_CALLED("scr_set(%s)"), _nc_visbuf(file)));

    if (scr_init(file) == ERR) {
	returnCode(ERR);
    } else {
	delwin(newscr);
	SP->_newscr = dupwin(curscr);
#if !USE_REENTRANT
	newscr = SP->_newscr;
#endif
	returnCode(OK);
    }
}