initscr.c revision 1.19 
1/*	$NetBSD: initscr.c,v 1.19 2000/06/15 21:20:16 jdc Exp $	*/
2
3/*
4 * Copyright (c) 1981, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)initscr.c	8.2 (Berkeley) 5/4/94";
40#else
41__RCSID("$NetBSD: initscr.c,v 1.19 2000/06/15 21:20:16 jdc Exp $");
42#endif
43#endif	/* not lint */
44
45#include <signal.h>
46#include <stdlib.h>
47
48#include "curses.h"
49#include "curses_private.h"
50
51/* Window list */
52struct __winlist	*__winlistp;
53
54/*
55 * initscr --
56 *	Initialize the current and standard screen.
57 */
58WINDOW *
59initscr(void)
60{
61	char *sp;
62
63#ifdef DEBUG
64	__CTRACE("initscr\n");
65#endif
66	__echoit = 1;
67        __pfast = __rawmode = __noqch = 0;
68	__nca = A_NORMAL;
69
70	if (gettmode() == ERR)
71		return (NULL);
72
73	/*
74	 * If My_term is set, or can't find a terminal in the environment,
75	 * use Def_term.
76	 */
77	if (My_term || (sp = getenv("TERM")) == NULL)
78		sp = (char *)Def_term;
79	if (setterm(sp) == ERR)
80		return (NULL);
81
82	/* Need either homing or cursor motion for refreshes */
83	if (!HO && !CM)
84		return (NULL);
85
86	__winlistp = NULL;
87
88	if (curscr != NULL)
89		delwin(curscr);
90	if ((curscr = newwin(LINES, COLS, 0, 0)) == ERR)
91		return (NULL);
92	clearok(curscr, 1);
93
94	if (stdscr != NULL)
95		delwin(stdscr);
96	if ((stdscr = newwin(LINES, COLS, 0, 0)) == ERR) {
97		delwin(curscr);
98		return (NULL);
99	}
100
101	if (__virtscr != NULL)
102		delwin(__virtscr);
103	if ((__virtscr = newwin(LINES, COLS, 0, 0)) == ERR) {
104		delwin(curscr);
105		delwin(stdscr);
106		return (NULL);
107	}
108
109	__init_getch();
110
111	__init_acs();
112
113	__set_stophandler();
114
115#ifdef DEBUG
116	__CTRACE("initscr: LINES = %d, COLS = %d\n", LINES, COLS);
117#endif
118	__startwin();
119
120	return (stdscr);
121}
122