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