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      1 /*	$NetBSD: initscr.c,v 1.36 2021/09/06 07:03:49 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)initscr.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: initscr.c,v 1.36 2021/09/06 07:03:49 rin Exp $");
     38 #endif
     39 #endif	/* not lint */
     40 
     41 #include <stdlib.h>
     42 
     43 #include "curses.h"
     44 #include "curses_private.h"
     45 
     46 
     47 /*
     48  * initscr --
     49  *	Initialize the current and standard screen.
     50  */
     51 WINDOW *
     52 initscr(void)
     53 {
     54 	const char *sp;
     55 
     56 	__CTRACE(__CTRACE_INIT, "initscr\n");
     57 
     58 	/*
     59 	 * If My_term is set, or can't find a terminal in the environment,
     60 	 * use Def_term.
     61 	 */
     62 	if (My_term || (sp = getenv("TERM")) == NULL)
     63 		sp = Def_term;
     64 
     65 	/* LINTED const castaway; newterm does not modify sp! */
     66 	if ((_cursesi_screen = newterm((char *) sp, stdout, stdin)) == NULL) {
     67 		/*
     68 		 * POSIX says we should write a diagnostic and exit on error.
     69 		 * As such some applications don't bother checking the return
     70 		 * value at all.
     71 		 */
     72 		perror("initscr");
     73 		exit(EXIT_FAILURE);
     74 	}
     75 
     76 	set_term(_cursesi_screen);
     77 	wrefresh(curscr);
     78 	__ripofftouch(_cursesi_screen);
     79 
     80 	return stdscr;
     81 }
     82