OpenBSD-4.6/lib/libcurses/base/lib_screen.c

/*	$OpenBSD: lib_screen.c,v 1.3 2001/01/22 18:01:43 millert Exp $	*/

/****************************************************************************
 * Copyright (c) 1998,2000 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: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

#include <curses.priv.h>

#include <sys/stat.h>
#include <time.h>
#include <term.h>		/* exit_ca_mode, non_rev_rmcup */

MODULE_ID("$From: lib_screen.c,v 1.17 2000/12/10 02:43:27 tom Exp $")

static time_t dumptime;

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

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

    (void) fread(&tmp, sizeof(WINDOW), 1, filep);
    if (ferror(filep))
	returnWin(0);

    if ((nwin = newwin(tmp._maxy + 1, tmp._maxx + 1, 0, 0)) == 0)
	returnWin(0);

    /*
     * We deliberately do not restore the _parx, _pary, or _parent
     * fields, because the window hierarchy within which they
     * made sense is probably gone.
     */
    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 | _ISPAD);

    nwin->_attrs = tmp._attrs;
    nwin->_bkgd = tmp._bkgd;

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

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

    for (n = 0; n < nwin->_maxy + 1; n++) {
	(void) fread(nwin->_line[n].text,
		     sizeof(chtype), (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) {
	(void) fwrite(win, sizeof(WINDOW), 1, filep);
	if (ferror(filep))
	    returnCode(code);

	for (n = 0; n < win->_maxy + 1; n++) {
	    (void) fwrite(win->_line[n].text,
			  sizeof(chtype), (size_t) (win->_maxx + 1), filep);
	    if (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);
	newscr = getwin(fp);
	(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);
	dumptime = time((time_t *) 0);
	returnCode(OK);
    }
}

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

    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 if (fstat(STDOUT_FILENO, &stb) || stb.st_mtime > dumptime)
	returnCode(ERR);
    else {
	delwin(curscr);
	curscr = getwin(fp);
	(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);
	newscr = dupwin(curscr);
	returnCode(OK);
    }
}