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 
49 MODULE_ID("$Id: lib_initscr.c,v 1.45 2020/02/02 23:34:34 tom Exp $")
50 
51 NCURSES_EXPORT(WINDOW *)
52 initscr(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 	if ((env = getenv("TERM")) == 0
70 	    || *env == '\0') {
71 	    env = "unknown";
72 	}
73 	if ((name = strdup(env)) == NULL) {
74 	    fprintf(stderr, "Error opening allocating $TERM.\n");
75 	    ExitProgram(EXIT_FAILURE);
76 	}
77 #ifdef __CYGWIN__
78 	/*
79 	 * 2002/9/21
80 	 * Work around a bug in Cygwin.  Full-screen subprocesses run from
81 	 * bash, in turn spawned from another full-screen process, will dump
82 	 * core when attempting to write to stdout.  Opening /dev/tty
83 	 * explicitly seems to fix the problem.
84 	 */
85 	if (NC_ISATTY(fileno(stdout))) {
86 	    FILE *fp = fopen("/dev/tty", "w");
87 	    if (fp != 0 && NC_ISATTY(fileno(fp))) {
88 		fclose(stdout);
89 		dup2(fileno(fp), STDOUT_FILENO);
90 		stdout = fdopen(STDOUT_FILENO, "w");
91 	    }
92 	}
93 #endif
94 	if (newterm(name, stdout, stdin) == 0) {
95 	    fprintf(stderr, "Error opening terminal: %s.\n", name);
96 	    ExitProgram(EXIT_FAILURE);
97 	}
98 
99 	/* def_shell_mode - done in newterm/_nc_setupscreen */
100 #if NCURSES_SP_FUNCS
101 	NCURSES_SP_NAME(def_prog_mode) (CURRENT_SCREEN);
102 #else
103 	def_prog_mode();
104 #endif
105 	free(name);
106     }
107     result = stdscr;
108     _nc_unlock_global(curses);
109 
110     returnWin(result);
111 }
112