libc/xcurses/initscr.c

	initscr.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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/*
 * initscr.c
 *
 * XCurses Library
 *
 * Copyright 1986, 1994 by Mortice Kern Systems Inc.  All rights reserved.
 *
 */

#ifdef M_RCSID
#ifndef lint
static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/initscr.c 1.5 1995/09/28 16:47:03 ant Exp $";
#endif
#endif

#include <private.h>
#include <errno.h>
#include <stdlib.h>

static char nomem_msg[] = m_textstr(
    3139, "Failed to allocate required memory.\n", "E"
);
static char noterm_msg[] = m_textstr(
    202, "Unknown terminal \"%s\".\n", "E term"
);
static char dumb_msg[] = m_textstr(
    3140, "Terminal \"%s\" has insufficent capabilities for Curses.\n",
    "E term"
);

/*f
 * Initialize XCurses for use with a single terminal.  stdin and stdout
 * are used.  If a program needs an indication of error conditions,
 * so that it can continue to run in a line-oriented mode, use newterm()
 * instead.
 */
WINDOW *
initscr()
{
    WINDOW *w;
    SCREEN *sp;
    int i, n, begy;
    char *term, *err;

#ifdef M_CURSES_TRACE
    __m_trace("initscr(void)");
#endif

    errno = 0;
    sp = newterm((char *) 0, stdout, stdin);

    if (sp == (SCREEN *) 0) {
        err = errno == ENOMEM ? nomem_msg : noterm_msg;
        goto error_1;
    }

    (void) set_term(sp);

    /* We require some form of cursor positioning and the ability to
     * clear the end of a line.  These abilities should be sufficient
     * to provide minimum full screen support.
     */
    if (1 < lines
    && cursor_address == (char *) 0
    && row_address == (char *) 0
    && (cursor_up == (char *) 0 || cursor_down == (char *) 0)
    && (parm_up_cursor == (char *) 0 || parm_down_cursor == (char *) 0)) {
        err = dumb_msg;
        goto error_3;
    }

    if ((1 < lines && cursor_address == (char *) 0)
    && column_address == (char *) 0
    && (cursor_left == (char *) 0 || cursor_right == (char *) 0)
    && (parm_left_cursor == (char *) 0 || parm_right_cursor == (char *)0)) {
        err = dumb_msg;
        goto error_3;
    }

    if (clr_eol == (char *) 0) {
        err = dumb_msg;
        goto error_3;
    }

    return __m_return_pointer("initscr", stdscr);
error_3:
    (void) delwin(stdscr);
error_2:
    (void) endwin();
    (void) delscreen(sp);
error_1:
    /* newterm()/setupterm() attempts to load $TERM, else if
     * $TERM is not defined, the vendor's default terminal type.
     */
    if ((term = getenv("TERM")) == (char *) 0)
        term = M_TERM_NAME;

    (void) fprintf(stderr, m_strmsg(err), term);
error_0:
    exit(1);
    return (0); /* keep gcc happy */
}