1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1995-1998 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/* LINTLIBRARY */
30
31/*
32 * initscr.c
33 *
34 * XCurses Library
35 *
36 * Copyright 1986, 1994 by Mortice Kern Systems Inc.  All rights reserved.
37 *
38 */
39
40#ifdef M_RCSID
41#ifndef lint
42static char rcsID[] =
43"$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/"
44"libxcurses/src/libc/xcurses/rcs/initscr.c 1.4 1998/04/30 20:30:21 "
45"cbates Exp $";
46#endif
47#endif
48
49#include <private.h>
50#include <errno.h>
51#include <stdlib.h>
52
53static const char nomem_msg[] = "Failed to allocate required memory.\n";
54static const char noterm_msg[] = "Unknown terminal \"%s\".\n";
55static const char dumb_msg[] =
56	"Terminal \"%s\" has insufficent capabilities for Curses.\n";
57
58/*
59 * Initialize XCurses for use with a single terminal.  stdin and stdout
60 * are used.  If a program needs an indication of error conditions,
61 * so that it can continue to run in a line-oriented mode, use newterm()
62 * instead.
63 */
64WINDOW *
65initscr(void)
66{
67	SCREEN	*sp;
68	char	*term, *err;
69
70	errno = 0;
71	sp = newterm(NULL, stdout, stdin);
72
73	if (sp == NULL) {
74		err = (errno == ENOMEM) ? (char *)nomem_msg :
75			(char *)noterm_msg;
76		goto error_1;
77	}
78
79	(void) set_term(sp);
80
81	/*
82	 * We require some form of cursor positioning and the ability to
83	 * clear the end of a line.  These abilities should be sufficient
84	 * to provide minimum full screen support.
85	 */
86	if ((1 < lines) && (cursor_address == NULL) &&
87		(row_address == NULL) &&
88		((cursor_up == NULL) || (cursor_down == NULL)) &&
89		((parm_up_cursor == NULL) || (parm_down_cursor == NULL))) {
90		err = (char *)dumb_msg;
91		goto error_3;
92	}
93
94	if (((1 < lines) && (cursor_address == NULL)) &&
95		(column_address == NULL) &&
96		((cursor_left == NULL) || (cursor_right == NULL)) &&
97		((parm_left_cursor == NULL) ||
98		(parm_right_cursor == NULL))) {
99		err = (char *)dumb_msg;
100		goto error_3;
101	}
102
103	if (clr_eol == NULL) {
104		err = (char *)dumb_msg;
105		goto error_3;
106	}
107
108	return (stdscr);
109
110error_3:
111	(void) delwin(stdscr);
112	(void) endwin();
113	(void) delscreen(sp);
114
115error_1:
116	/*
117	 * newterm()/setupterm() attempts to load $TERM, else if
118	 * $TERM is not defined, the vendor's default terminal type.
119	 */
120	if ((term = getenv("TERM")) == NULL) {
121		term = M_TERM_NAME;
122	}
123
124	(void) fprintf(stderr, err, term);
125	exit(1);
126	return (NULL);
127}
128