1 /*
2 * Copyright (c) 1981, 1993
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 8.1 (Berkeley) 6/4/93";
36 #endif /* not lint */
37
38 #include <curses.h>
39 #include <signal.h>
40 #include <stdlib.h>
41
42 /*
43 * initscr --
44 * Initialize the current and standard screen.
45 */
46 WINDOW *
initscr()47 initscr()
48 {
49 register char *sp;
50
51 #ifdef DEBUG
52 __CTRACE("initscr\n");
53 #endif
54 __echoit = 1;
55 __pfast = __rawmode = __noqch = 0;
56
57 if (gettmode() == ERR)
58 return (NULL);
59
60 /*
61 * If My_term is set, or can't find a terminal in the environment,
62 * use Def_term.
63 */
64 if (My_term || (sp = getenv("TERM")) == NULL)
65 sp = Def_term;
66 if (setterm(sp) == ERR)
67 return (NULL);
68
69 /* Need either homing or cursor motion for refreshes */
70 if (!HO && !CM)
71 return (NULL);
72
73 if (curscr != NULL)
74 delwin(curscr);
75 if ((curscr = newwin(LINES, COLS, 0, 0)) == ERR)
76 return (NULL);
77 clearok(curscr, 1);
78
79 if (stdscr != NULL)
80 delwin(stdscr);
81 if ((stdscr = newwin(LINES, COLS, 0, 0)) == ERR) {
82 delwin(curscr);
83 return (NULL);
84 }
85
86 __set_stophandler();
87
88 #ifdef DEBUG
89 __CTRACE("initscr: LINES = %d, COLS = %d\n", LINES, COLS);
90 #endif
91 __startwin();
92
93 return (stdscr);
94 }
95