1/* $OpenBSD: lib_initscr.c,v 1.4 2023/10/17 09:52:08 nicm Exp $ */
2
3/****************************************************************************
4 * Copyright 2019,2020 Thomas E. Dickey                                     *
5 * Copyright 1998-2016,2017 Free Software Foundation, Inc.                  *
6 *                                                                          *
7 * Permission is hereby granted, free of charge, to any person obtaining a  *
8 * copy of this software and associated documentation files (the            *
9 * "Software"), to deal in the Software without restriction, including      *
10 * without limitation the rights to use, copy, modify, merge, publish,      *
11 * distribute, distribute with modifications, sublicense, and/or sell       *
12 * copies of the Software, and to permit persons to whom the Software is    *
13 * furnished to do so, subject to the following conditions:                 *
14 *                                                                          *
15 * The above copyright notice and this permission notice shall be included  *
16 * in all copies or substantial portions of the Software.                   *
17 *                                                                          *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
25 *                                                                          *
26 * Except as contained in this notice, the name(s) of the above copyright   *
27 * holders shall not be used in advertising or otherwise to promote the     *
28 * sale, use or other dealings in this Software without prior written       *
29 * authorization.                                                           *
30 ****************************************************************************/
31
32/****************************************************************************
33 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
34 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
35 *     and: Thomas E. Dickey                        1996-on                 *
36 ****************************************************************************/
37
38/*
39**	lib_initscr.c
40**
41**	The routines initscr(), and termname().
42**
43*/
44
45#include <curses.priv.h>
46
47#if HAVE_SYS_TERMIO_H
48#include <sys/termio.h>		/* needed for ISC */
49#endif
50
51MODULE_ID("$Id: lib_initscr.c,v 1.4 2023/10/17 09:52:08 nicm Exp $")
52
53NCURSES_EXPORT(WINDOW *)
54initscr(void)
55{
56    WINDOW *result;
57
58    START_TRACE();
59    T((T_CALLED("initscr()")));
60
61    _nc_init_pthreads();
62    _nc_lock_global(curses);
63
64    /* Portable applications must not call initscr() more than once */
65    if (!_nc_globals.init_screen) {
66	const char *env;
67	char *name;
68
69	_nc_globals.init_screen = TRUE;
70
71	env = getenv("TERM");
72	(void) VALID_TERM_ENV(env, "unknown");
73
74	if ((name = strdup(env)) == NULL) {
75	    fprintf(stderr, "Error opening allocating $TERM.\n");
76	    ExitProgram(EXIT_FAILURE);
77	}
78#ifdef __CYGWIN__
79	/*
80	 * 2002/9/21
81	 * Work around a bug in Cygwin.  Full-screen subprocesses run from
82	 * bash, in turn spawned from another full-screen process, will dump
83	 * core when attempting to write to stdout.  Opening /dev/tty
84	 * explicitly seems to fix the problem.
85	 */
86	if (NC_ISATTY(fileno(stdout))) {
87	    FILE *fp = fopen("/dev/tty", "w");
88	    if (fp != 0 && NC_ISATTY(fileno(fp))) {
89		fclose(stdout);
90		dup2(fileno(fp), STDOUT_FILENO);
91		stdout = fdopen(STDOUT_FILENO, "w");
92	    }
93	}
94#endif
95	if (newterm(name, stdout, stdin) == 0) {
96	    fprintf(stderr, "Error opening terminal: %s.\n", name);
97	    ExitProgram(EXIT_FAILURE);
98	}
99
100	/* def_shell_mode - done in newterm/_nc_setupscreen */
101#if NCURSES_SP_FUNCS
102	NCURSES_SP_NAME(def_prog_mode) (CURRENT_SCREEN);
103#else
104	def_prog_mode();
105#endif
106	free(name);
107    }
108    result = stdscr;
109    _nc_unlock_global(curses);
110
111    returnWin(result);
112}
113