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screen.c revision 1.1
      1 /*	$NetBSD: screen.c,v 1.1 2001/12/02 09:14:22 blymn 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[] = "@(#)screen.c	8.2 (blymn) 11/27/2001";
     40 #else
     41 __RCSID("$NetBSD: screen.c,v 1.1 2001/12/02 09:14:22 blymn Exp $");
     42 #endif
     43 #endif					/* not lint */
     44 
     45 #include <stdlib.h>
     46 
     47 #include "curses.h"
     48 #include "curses_private.h"
     49 
     50 /*
     51  * set_term --
     52  *      Change the term to the given screen.
     53  *
     54  */
     55 SCREEN *
     56 set_term(SCREEN *new)
     57 {
     58 	SCREEN *old_screen;
     59 
     60 	if (_cursesi_screen != NULL) {
     61 		old_screen = _cursesi_screen;
     62 
     63 		  /* save changes made to the current screen... */
     64 		old_screen->echoit = __echoit;
     65 		old_screen->pfast = __pfast;
     66 		old_screen->rawmode = __rawmode;
     67 		old_screen->noqch = __noqch;
     68 		old_screen->nca = __nca;
     69 		old_screen->winlistp = __winlistp;
     70 		old_screen->COLS = COLS;
     71 		old_screen->LINES = LINES;
     72 		old_screen->COLORS = COLORS;
     73 		old_screen->COLOR_PAIRS = COLOR_PAIRS;
     74 		old_screen->GT = __GT;
     75 		old_screen->NONL = __NONL;
     76 		old_screen->UPPERCASE = __UPPERCASE;
     77 	}
     78 
     79 	_cursesi_screen = new;
     80 
     81 	__echoit = new->echoit;
     82         __pfast = new->pfast;
     83 	__rawmode = new->rawmode;
     84 	__noqch = new->noqch;
     85 	__nca = new->nca;
     86 	COLS = new->COLS;
     87 	LINES = new->LINES;
     88 	COLORS = new->COLORS;
     89 	COLOR_PAIRS = new->COLOR_PAIRS;
     90 	__GT = new->GT;
     91 	__NONL = new->NONL;
     92 	__UPPERCASE = new->UPPERCASE;
     93 
     94 	_cursesi_resetterm(new);
     95 
     96 	__winlistp = new->winlistp;
     97 
     98 	curscr = new->curscr;
     99 	clearok(curscr, new->clearok);
    100 	stdscr = new->stdscr;
    101 	__virtscr = new->__virtscr;
    102 
    103 	_cursesi_reset_acs(new);
    104 
    105 #ifdef DEBUG
    106 	__CTRACE("initscr: LINES = %d, COLS = %d\n", LINES, COLS);
    107 #endif
    108 
    109 	return old_screen;
    110 }
    111 
    112 /*
    113  * newterm --
    114  *      Set up a new screen.
    115  *
    116  */
    117 SCREEN *
    118 newterm(char *type, FILE *outfd, FILE *infd)
    119 {
    120 	SCREEN *new_screen;
    121 	char *sp;
    122 
    123 	sp = type;
    124 	if ((type == NULL) && (sp = getenv("TERM")) == NULL)
    125 		return NULL;
    126 
    127 	if ((new_screen = (SCREEN *) malloc(sizeof(SCREEN))) == NULL)
    128 		return NULL;
    129 
    130 	new_screen->infd = infd;
    131 	new_screen->outfd = outfd;
    132 	new_screen->echoit = 1;
    133         new_screen->pfast = new_screen->rawmode = new_screen->noqch = 0;
    134 	new_screen->nca = A_NORMAL;
    135 	new_screen->color_type = COLOR_NONE;
    136 	new_screen->old_mode = 2;
    137 	new_screen->stdbuf = NULL;
    138 	new_screen->stdscr = NULL;
    139 	new_screen->curscr = NULL;
    140 	new_screen->__virtscr = NULL;
    141 	new_screen->curwin = 0;
    142 
    143 	if (_cursesi_gettmode(new_screen) == ERR)
    144 		goto error_exit;
    145 
    146 	if (_cursesi_setterm((char *)sp, new_screen) == ERR)
    147 		goto error_exit;
    148 
    149 	/* Need either homing or cursor motion for refreshes */
    150 	if (!new_screen->tc_ho && !new_screen->tc_cm)
    151 		goto error_exit;
    152 
    153 	new_screen->winlistp = NULL;
    154 
    155 	if ((new_screen->curscr = __newwin(new_screen, new_screen->LINES,
    156 					   new_screen->COLS, 0, 0)) == ERR)
    157 		goto error_exit;
    158 
    159 	clearok(new_screen->curscr, 1);
    160 
    161 	if ((new_screen->stdscr = __newwin(new_screen, new_screen->LINES,
    162 					   new_screen->COLS, 0, 0)) == ERR) {
    163 		delwin(new_screen->curscr);
    164 		goto error_exit;
    165 	}
    166 
    167 	if ((new_screen->__virtscr = __newwin(new_screen, new_screen->LINES,
    168 					    new_screen->COLS, 0, 0)) == ERR) {
    169 		delwin(new_screen->curscr);
    170 		delwin(new_screen->stdscr);
    171 		goto error_exit;
    172 	}
    173 
    174 	__init_getch(new_screen);
    175 
    176 	__init_acs(new_screen);
    177 
    178 	__set_stophandler();
    179 
    180 	  /*
    181 	   * bleh - it seems that apps expect the first newterm to set
    182 	   * up the curses screen.... emulate this.
    183 	   */
    184 	if (_cursesi_screen == NULL) {
    185 		__echoit = new_screen->echoit;
    186 		__pfast = new_screen->pfast;
    187 		__rawmode = new_screen->rawmode;
    188 		__noqch = new_screen->noqch;
    189 		__nca = new_screen->nca;
    190 		COLS = new_screen->COLS;
    191 		LINES = new_screen->LINES;
    192 		COLORS = new_screen->COLORS;
    193 		COLOR_PAIRS = new_screen->COLOR_PAIRS;
    194 		__GT = new_screen->GT;
    195 		__NONL = new_screen->NONL;
    196 		__UPPERCASE = new_screen->UPPERCASE;
    197 		set_term(new_screen);
    198 	}
    199 
    200 #ifdef DEBUG
    201 	__CTRACE("newterm: LINES = %d, COLS = %d\n", LINES, COLS);
    202 #endif
    203 	__startwin(new_screen);
    204 
    205 	return new_screen;
    206 
    207   error_exit:
    208 	free(new_screen);
    209 	return NULL;
    210 }
    211 
    212 /*
    213  * delscreen --
    214  *   Free resources used by the given screen and destroy it.
    215  *
    216  */
    217 void
    218 delscreen(SCREEN *screen)
    219 {
    220         struct __winlist *list, *np;
    221 
    222 	  /* free up the termcap entry stuff */
    223 	t_freent(screen->cursesi_genbuf);
    224 
    225 	  /* walk the window list and kill all the parent windows */
    226 	for (list = screen->winlistp; list != NULL; list = list->nextp) {
    227 		if (list->winp->orig == NULL)
    228 			delwin(list->winp);
    229 	}
    230 
    231 	  /* free the windows list structures */
    232 	for (list = screen->winlistp; list;) {
    233 		np = list->nextp;
    234 		free(list);
    235 		list = np;
    236 	}
    237 
    238 	  /* free the storage of the keymaps */
    239 	_cursesi_free_keymap(screen->base_keymap);
    240 
    241 	free(screen->stdbuf);
    242 	free(screen);
    243 }
    244