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initscr.c revision 1.7 
      1 /*	$NetBSD: initscr.c,v 1.7 1997/07/22 07:36:47 mikel 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)initscr.c	8.2 (Berkeley) 5/4/94";
     40 #else
     41 __RCSID("$NetBSD: initscr.c,v 1.7 1997/07/22 07:36:47 mikel Exp $");
     42 #endif
     43 #endif	/* not lint */
     44 
     45 #include <signal.h>
     46 #include <stdlib.h>
     47 
     48 #include "curses.h"
     49 
     50 /*
     51  * initscr --
     52  *	Initialize the current and standard screen.
     53  */
     54 WINDOW *
     55 initscr()
     56 {
     57 	register char *sp;
     58 
     59 #ifdef DEBUG
     60 	__CTRACE("initscr\n");
     61 #endif
     62 	__echoit = 1;
     63         __pfast = __rawmode = __noqch = 0;
     64 
     65 	if (gettmode() == ERR)
     66 		return (NULL);
     67 
     68 	/*
     69 	 * If My_term is set, or can't find a terminal in the environment,
     70 	 * use Def_term.
     71 	 */
     72 	if (My_term || (sp = getenv("TERM")) == NULL)
     73 		sp = Def_term;
     74 	if (setterm(sp) == ERR)
     75 		return (NULL);
     76 
     77 	/* Need either homing or cursor motion for refreshes */
     78 	if (!HO && !CM)
     79 		return (NULL);
     80 
     81 	if (curscr != NULL)
     82 		delwin(curscr);
     83 	if ((curscr = newwin(LINES, COLS, 0, 0)) == ERR)
     84 		return (NULL);
     85 	clearok(curscr, 1);
     86 
     87 	if (stdscr != NULL)
     88 		delwin(stdscr);
     89 	if ((stdscr = newwin(LINES, COLS, 0, 0)) == ERR) {
     90 		delwin(curscr);
     91 		return (NULL);
     92 	}
     93 
     94 	__set_stophandler();
     95 
     96 #ifdef DEBUG
     97 	__CTRACE("initscr: LINES = %d, COLS = %d\n", LINES, COLS);
     98 #endif
     99 	__startwin();
    100 
    101 	return (stdscr);
    102 }
    103