Home | History | Annotate | Line # | Download | only in libcurses
initscr.c revision 1.4 
      1 /*
      2  * Copyright (c) 1981, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)initscr.c	8.1 (Berkeley) 6/4/93";
     36 #endif	/* not lint */
     37 
     38 #include <curses.h>
     39 #include <signal.h>
     40 #include <stdlib.h>
     41 
     42 /*
     43  * initscr --
     44  *	Initialize the current and standard screen.
     45  */
     46 WINDOW *
     47 initscr()
     48 {
     49 	register char *sp;
     50 
     51 #ifdef DEBUG
     52 	__CTRACE("initscr\n");
     53 #endif
     54 	__echoit = 1;
     55         __pfast = __rawmode = __noqch = 0;
     56 
     57 	if (gettmode() == ERR)
     58 		return (NULL);
     59 
     60 	/*
     61 	 * If My_term is set, or can't find a terminal in the environment,
     62 	 * use Def_term.
     63 	 */
     64 	if (My_term || (sp = getenv("TERM")) == NULL)
     65 		sp = Def_term;
     66 	if (setterm(sp) == ERR)
     67 		return (NULL);
     68 
     69 	/* Need either homing or cursor motion for refreshes */
     70 	if (!HO && !CM)
     71 		return (NULL);
     72 
     73 	if (curscr != NULL)
     74 		delwin(curscr);
     75 	if ((curscr = newwin(LINES, COLS, 0, 0)) == ERR)
     76 		return (NULL);
     77 	clearok(curscr, 1);
     78 
     79 	if (stdscr != NULL)
     80 		delwin(stdscr);
     81 	if ((stdscr = newwin(LINES, COLS, 0, 0)) == ERR) {
     82 		delwin(curscr);
     83 		return (NULL);
     84 	}
     85 
     86 	__set_stophandler();
     87 
     88 #ifdef DEBUG
     89 	__CTRACE("initscr: LINES = %d, COLS = %d\n", LINES, COLS);
     90 #endif
     91 	__startwin();
     92 
     93 	return (stdscr);
     94 }
     95