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