1/****************************************************************************
2 * Copyright 2019,2020 Thomas E. Dickey                                     *
3 * Copyright 1998-2016,2017 Free Software Foundation, Inc.                  *
4 *                                                                          *
5 * Permission is hereby granted, free of charge, to any person obtaining a  *
6 * copy of this software and associated documentation files (the            *
7 * "Software"), to deal in the Software without restriction, including      *
8 * without limitation the rights to use, copy, modify, merge, publish,      *
9 * distribute, distribute with modifications, sublicense, and/or sell       *
10 * copies of the Software, and to permit persons to whom the Software is    *
11 * furnished to do so, subject to the following conditions:                 *
12 *                                                                          *
13 * The above copyright notice and this permission notice shall be included  *
14 * in all copies or substantial portions of the Software.                   *
15 *                                                                          *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23 *                                                                          *
24 * Except as contained in this notice, the name(s) of the above copyright   *
25 * holders shall not be used in advertising or otherwise to promote the     *
26 * sale, use or other dealings in this Software without prior written       *
27 * authorization.                                                           *
28 ****************************************************************************/
29
30/****************************************************************************
31 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
32 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
33 *     and: Thomas E. Dickey                        1996-on                 *
34 ****************************************************************************/
35
36/*
37**	lib_initscr.c
38**
39**	The routines initscr(), and termname().
40**
41*/
42
43#include <curses.priv.h>
44
45#if HAVE_SYS_TERMIO_H
46#include <sys/termio.h>		/* needed for ISC */
47#endif
48
49MODULE_ID("$Id: lib_initscr.c,v 1.48 2020/09/07 14:26:48 tom Exp $")
50
51NCURSES_EXPORT(WINDOW *)
52initscr(void)
53{
54    WINDOW *result;
55
56    START_TRACE();
57    T((T_CALLED("initscr()")));
58
59    _nc_init_pthreads();
60    _nc_lock_global(curses);
61
62    /* Portable applications must not call initscr() more than once */
63    if (!_nc_globals.init_screen) {
64	const char *env;
65	char *name;
66
67	_nc_globals.init_screen = TRUE;
68
69	env = getenv("TERM");
70	(void) VALID_TERM_ENV(env, "unknown");
71
72	if ((name = strdup(env)) == NULL) {
73	    fprintf(stderr, "Error opening allocating $TERM.\n");
74	    ExitProgram(EXIT_FAILURE);
75	}
76#ifdef __CYGWIN__
77	/*
78	 * 2002/9/21
79	 * Work around a bug in Cygwin.  Full-screen subprocesses run from
80	 * bash, in turn spawned from another full-screen process, will dump
81	 * core when attempting to write to stdout.  Opening /dev/tty
82	 * explicitly seems to fix the problem.
83	 */
84	if (NC_ISATTY(fileno(stdout))) {
85	    FILE *fp = fopen("/dev/tty", "w");
86	    if (fp != 0 && NC_ISATTY(fileno(fp))) {
87		fclose(stdout);
88		dup2(fileno(fp), STDOUT_FILENO);
89		stdout = fdopen(STDOUT_FILENO, "w");
90	    }
91	}
92#endif
93	if (newterm(name, stdout, stdin) == 0) {
94	    fprintf(stderr, "Error opening terminal: %s.\n", name);
95	    ExitProgram(EXIT_FAILURE);
96	}
97
98	/* def_shell_mode - done in newterm/_nc_setupscreen */
99#if NCURSES_SP_FUNCS
100	NCURSES_SP_NAME(def_prog_mode) (CURRENT_SCREEN);
101#else
102	def_prog_mode();
103#endif
104	free(name);
105    }
106    result = stdscr;
107    _nc_unlock_global(curses);
108
109    returnWin(result);
110}
111