libc/xcurses/scr_dump.c

	scr_dump.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1995-1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/* LINTLIBRARY */

/*
 * scr_dump.c
 *
 * XCurses Library
 *
 * Copyright 1990, 1995 by Mortice Kern Systems Inc.  All rights reserved.
 *
 */

#if M_RCSID
#ifndef lint
static char rcsID[] =
"$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/"
"libxcurses/src/libc/xcurses/rcs/scr_dump.c 1.6 1998/06/01 16:25:23 "
"cbates Exp $";
#endif
#endif

#include <private.h>
#include <sys/types.h>
#include <sys/stat.h>

/*
 * Save the current screen image.
 */
int
scr_dump(const char *f)
{
    int code;
    FILE    *fp;

    code = ERR;

    if ((fp = fopen(f, "wb")) != NULL) {
        code = putwin(curscr, fp);
        (void) fclose(fp);
    }

    return (code);
}

static int
scr_replace(WINDOW *w, const char *f)
{
    int i;
    FILE    *fp;
    WINDOW  *new;

    if ((fp = fopen(f, "rb")) == NULL)
        return (ERR);

    new = getwin(fp);
    (void) fclose(fp);

    if (new == NULL)
        return (ERR);

    if (new->_maxy != w->_maxy || new->_maxx != w->_maxx) {
        (void) delwin(new);
        return (ERR);
    }

    /* Replace contents of curscr window structure. */
    free(w->_base);
    free(w->_line);
    free(w->_first);
    new->_flags &= ~W_CLEAR_WINDOW; /* Removed default clear command */
    *w = *new;

    /* Rehash the current screen? */
    if (w == curscr)
        for (i = 0; i < w->_maxy; ++i)
            __m_cc_hash(w, __m_screen->_hash, i);

    /* Discard the working window. */
    new->_base = NULL;
    new->_line = NULL;
    new->_first = NULL;
    (void) delwin(new);
    /* Make sure we know where the cursor is */
    (void) __m_mvcur(-1, -1, curscr->_cury, curscr->_curx, __m_outc);
    return (OK);
}

/*
 * A picture of what scr_restore(), scr_init(), and scr_set() do :
 *
 *              scr_restore()       scr_init()
 *                  |               |
 *  stdscr              V               V
 *  +----+           newscr          curscr
 *  |    |          +-------+       +-------+
 *  +----+  refresh() ->    |   |       |   |
 *              |   | doupdate() -> |   |
 *    w         |   |       |   |
 *  +----+  wrefresh(w) ->  |   |       |   |
 *  |    |          +-------+       +-------+
 *  +----+                        ^           ^
 *                    |                   |
 *                    \---- scr_set() ----/
 */

/*
 * Get a screen image that will appear next doupdate(),
 * replacing the current screen.
 */
int
scr_restore(const char *f)
{
    int code;

    code = scr_replace(__m_screen->_newscr, f);

    return (code);
}

/*
 * Get the screen image that really reflects what is on the screen,
 * though the applicatiion may not want it.  A subsequent doupdate()
 * will compared and make changes against this image.
 */
int
scr_init(const char *f)
{
    int code;
    struct stat tty, dump;
    char    *name;

    name = ttyname(cur_term->_ofd);
    if ((non_rev_rmcup && exit_ca_mode != NULL) ||
        stat(f, &dump) != 0 || name == NULL || stat(name, &tty) != 0)
        code = ERR;
    else {
        if (dump.st_mtime < tty.st_mtime)
            code = ERR;
        else {
            code = scr_replace(__m_screen->_curscr, f);
        }
    }

    return (code);
}

/*
 * Get the screen image that is really on the screen and that the
 * application wants on the screen.
 */
int
scr_set(const char *f)
{
    int code;

    if ((code = scr_init(f)) == OK)
        code = scr_restore(f);

    return (code);
}