lib_initscr.c

ncurses-5.4

/****************************************************************************
 * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
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 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <[e-mail]> 1992,1995               *
 *     and: Eric S. Raymond <[e-mail]>                         *
 *     and: Thomas E. Dickey                        1996-2003               *
 ****************************************************************************/

/*
**	lib_initscr.c
**
**	The routines initscr(), and termname().
**
*/

#include <curses.priv.h>

#if HAVE_SYS_TERMIO_H
#include <sys/termio.h>		/* needed for ISC */
#endif

MODULE_ID("$Id: lib_initscr.c,v 1.33 2003/12/27 19:13:51 tom Exp $")

NCURSES_EXPORT(WINDOW *)
initscr(void)
{
    static bool initialized = FALSE;
    NCURSES_CONST char *name;
    int value;

    START_TRACE();
    T((T_CALLED("initscr()")));
    /* Portable applications must not call initscr() more than once */
    if (!initialized) {
	initialized = TRUE;

	if ((name = getenv("TERM")) == 0
	    || *name == '\0')
	    name = "unknown";
#ifdef __CYGWIN__
	/*
	 * 2002/9/21
	 * Work around a bug in Cygwin.  Full-screen subprocesses run from
	 * bash, in turn spawned from another full-screen process, will dump
	 * core when attempting to write to stdout.  Opening /dev/tty
	 * explicitly seems to fix the problem.
	 */
	if (isatty(fileno(stdout))) {
	    FILE *fp = fopen("/dev/tty", "w");
	    if (fp != 0 && isatty(fileno(fp))) {
		fclose(stdout);
		dup2(fileno(fp), STDOUT_FILENO);
		stdout = fdopen(STDOUT_FILENO, "w");
	    }
	}
#endif
	if (newterm(name, stdout, stdin) == 0) {
	    fprintf(stderr, "Error opening terminal: %s.\n", name);
	    exit(EXIT_FAILURE);
	}

	/* allow user to set maximum escape delay from the environment */
	if ((value = _nc_getenv_num("ESCDELAY")) >= 0) {
	    ESCDELAY = value;
	}

	/* def_shell_mode - done in newterm/_nc_setupscreen */
	def_prog_mode();
    }
    returnWin(stdscr);
}