/*
 * 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 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1988 AT&T */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*LINTLIBRARY*/

#include        <stdlib.h>
#include        <signal.h>
#include        <sys/types.h>
#include        "curses_inc.h"

/*
 * This routine initializes the current and standard screen,
 * and sets up the terminal.  In case of error, initscr aborts.
 * If you want an error status returned, call
 *      scp = newscreen(getenv("TERM"), 0, 0, 0, stdout, stdin);
 */

WINDOW  *
initscr(void)
{
#ifdef  SIGPOLL
        void    (*savsignal)(int);
        extern  void    _ccleanup(int);
#else   /* SIGPOLL */
        int             (*savsignal)();
        extern  int     _ccleanup(int);
#endif  /* SIGPOLL */

#ifdef  SIGTSTP
        extern  void    _tstp(int);
#endif  /* SIGTSTP */

        static  char    i_called_before = FALSE;

/* Free structures we are about to throw away so we can reuse the memory. */

        if (i_called_before && SP) {
                delscreen(SP);
                SP = NULL;
        }
        if (newscreen(NULL, 0, 0, 0, stdout, stdin) == NULL) {
                (void) reset_shell_mode();
                if (term_errno != -1)
                        termerr();
                else
                        curserr();
                exit(1);
        }

#ifdef  DEBUG
        if (outf)
                fprintf(outf, "initscr: term = %s\n", SP);
#endif  /* DEBUG */
        i_called_before = TRUE;

#ifdef  SIGTSTP
        /*LINTED*/
        if ((savsignal = signal(SIGTSTP, SIG_IGN)) == SIG_DFL)
                (void) signal(SIGTSTP, _tstp);
        else
                (void) signal(SIGTSTP, savsignal);
#endif  /* SIGTSTP */
        /*LINTED*/
        if ((savsignal = signal(SIGINT, SIG_IGN)) == SIG_DFL)
                (void) signal(SIGINT, _ccleanup);
        else
                (void) signal(SIGINT, savsignal);

        /*LINTED*/
        if ((savsignal = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
                (void) signal(SIGQUIT, _ccleanup);
        else
                (void) signal(SIGQUIT, savsignal);

        return (stdscr);
}