1 /* $NetBSD: screen.c,v 1.33 2017/03/20 10:20:16 roy 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[] = "@(#)screen.c 8.2 (blymn) 11/27/2001"; 36 #else 37 __RCSID("$NetBSD: screen.c,v 1.33 2017/03/20 10:20:16 roy Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <stdlib.h> 42 43 #include "curses.h" 44 #include "curses_private.h" 45 46 static int filtered; 47 48 static void __delscreen(SCREEN *); 49 50 /* 51 * filter has to be called before either initscr or newterm. 52 */ 53 void 54 filter(void) 55 { 56 57 filtered = TRUE; 58 } 59 60 /* 61 * set_term -- 62 * Change the term to the given screen. 63 * 64 */ 65 SCREEN * 66 set_term(SCREEN *new) 67 { 68 SCREEN *old_screen = _cursesi_screen; 69 70 if (_cursesi_screen != NULL) { 71 /* save changes made to the current screen... */ 72 old_screen->echoit = __echoit; 73 old_screen->pfast = __pfast; 74 old_screen->rawmode = __rawmode; 75 old_screen->noqch = __noqch; 76 old_screen->COLS = COLS; 77 old_screen->LINES = LINES + __rippedlines(old_screen); 78 old_screen->ESCDELAY = ESCDELAY; 79 old_screen->TABSIZE = TABSIZE; 80 old_screen->COLORS = COLORS; 81 old_screen->COLOR_PAIRS = COLOR_PAIRS; 82 old_screen->GT = __GT; 83 old_screen->NONL = __NONL; 84 old_screen->UPPERCASE = __UPPERCASE; 85 } 86 87 _cursesi_screen = new; 88 89 __echoit = new->echoit; 90 __pfast = new->pfast; 91 __rawmode = new->rawmode; 92 __noqch = new->noqch; 93 COLS = new->COLS; 94 LINES = new->LINES - __rippedlines(new); 95 ESCDELAY = new->ESCDELAY; 96 TABSIZE = new->TABSIZE; 97 COLORS = new->COLORS; 98 COLOR_PAIRS = new->COLOR_PAIRS; 99 __GT = new->GT; 100 __NONL = new->NONL; 101 __UPPERCASE = new->UPPERCASE; 102 103 _cursesi_resetterm(new); 104 105 curscr = new->curscr; 106 clearok(curscr, new->clearok); 107 stdscr = new->stdscr; 108 __virtscr = new->__virtscr; 109 110 _cursesi_reset_acs(new); 111 #ifdef HAVE_WCHAR 112 _cursesi_reset_wacs(new); 113 #endif /* HAVE_WCHAR */ 114 115 #ifdef DEBUG 116 __CTRACE(__CTRACE_SCREEN, "set_term: LINES = %d, COLS = %d\n", 117 LINES, COLS); 118 #endif 119 120 return old_screen; 121 } 122 123 /* 124 * newterm -- 125 * Set up a new screen. 126 * 127 */ 128 SCREEN * 129 newterm(char *type, FILE *outfd, FILE *infd) 130 { 131 SCREEN *new_screen; 132 char *sp; 133 int rtop; 134 135 sp = type; 136 if (type == NULL && (sp = getenv("TERM")) == NULL) 137 return NULL; 138 139 if ((new_screen = calloc(1, sizeof(SCREEN))) == NULL) 140 return NULL; 141 142 #ifdef DEBUG 143 __CTRACE(__CTRACE_INIT, "newterm\n"); 144 #endif 145 146 new_screen->infd = infd; 147 /* 148 * POSIX standard says this should be set to infd by default, 149 * but this seems to break nvi by leaving an unrefreshed screen. 150 * Also, the line breakout optimisation advertised in ncurses 151 * doesn't actually do anything, so explicitly disabling it here makes 152 * sense for the time being. 153 * A caller can always enable it by calling typeahead(3) anyway. 154 */ 155 new_screen->checkfd = -1; // fileno(infd); 156 new_screen->outfd = outfd; 157 new_screen->echoit = new_screen->nl = 1; 158 new_screen->pfast = new_screen->rawmode = new_screen->noqch = 0; 159 new_screen->filtered = filtered; 160 filtered = FALSE; /* filter() must preceed each newterm() */ 161 new_screen->nca = A_NORMAL; 162 new_screen->color_type = COLOR_NONE; 163 new_screen->COLOR_PAIRS = 0; 164 new_screen->old_mode = 2; 165 new_screen->stdbuf = NULL; 166 new_screen->stdscr = NULL; 167 new_screen->curscr = NULL; 168 new_screen->__virtscr = NULL; 169 new_screen->curwin = 0; 170 new_screen->notty = FALSE; 171 new_screen->half_delay = FALSE; 172 new_screen->resized = 0; 173 new_screen->unget_len = 32; 174 175 if ((new_screen->unget_list = 176 malloc(sizeof(wchar_t) * new_screen->unget_len)) == NULL) 177 { 178 goto error_exit; 179 } 180 new_screen->unget_pos = 0; 181 182 if (_cursesi_gettmode(new_screen) == ERR) 183 goto error_exit; 184 185 if (_cursesi_setterm((char *)sp, new_screen) == ERR) 186 goto error_exit; 187 188 /* Need either homing or cursor motion for refreshes */ 189 if (!t_cursor_home(new_screen->term) && 190 !t_cursor_address(new_screen->term)) 191 goto error_exit; 192 193 new_screen->winlistp = NULL; 194 195 if ((new_screen->curscr = __newwin(new_screen, 0, 196 0, 0, 0, FALSE)) == NULL) 197 goto error_exit; 198 199 if ((new_screen->__virtscr = __newwin(new_screen, 0, 200 0, 0, 0, FALSE)) == NULL) 201 goto error_exit; 202 203 /* If Soft Label Keys are setup, they will ripoffline. */ 204 if (__slk_init(new_screen) == ERR) 205 goto error_exit; 206 207 if (__ripoffscreen(new_screen, &rtop) == ERR) 208 goto error_exit; 209 210 new_screen->stdscr = __newwin(new_screen, LINES, 0, rtop, 0, FALSE); 211 if (new_screen->stdscr == NULL) 212 goto error_exit; 213 214 clearok(new_screen->stdscr, 1); 215 216 __init_getch(new_screen); 217 __init_acs(new_screen); 218 #ifdef HAVE_WCHAR 219 __init_get_wch(new_screen); 220 __init_wacs(new_screen); 221 #endif /* HAVE_WCHAR */ 222 223 __set_stophandler(); 224 __set_winchhandler(); 225 226 /* 227 * bleh - it seems that apps expect the first newterm to set 228 * up the curses screen.... emulate this. 229 */ 230 if (_cursesi_screen == NULL || _cursesi_screen->endwin) { 231 set_term(new_screen); 232 } 233 234 #ifdef DEBUG 235 __CTRACE(__CTRACE_SCREEN, "newterm: LINES = %d, COLS = %d\n", 236 LINES, COLS); 237 #endif 238 __startwin(new_screen); 239 240 return new_screen; 241 242 error_exit: 243 __delscreen(new_screen); 244 free(new_screen->unget_list); 245 246 free(new_screen); 247 return NULL; 248 } 249 250 /* 251 * delscreen -- 252 * Free resources used by the given screen and destroy it. 253 * 254 */ 255 void 256 delscreen(SCREEN *screen) 257 { 258 259 #ifdef DEBUG 260 __CTRACE(__CTRACE_SCREEN, "delscreen(%p)\n", screen); 261 #endif 262 263 __delscreen(screen); 264 265 /* free the storage of the keymaps */ 266 _cursesi_free_keymap(screen->base_keymap); 267 268 /* free the Soft Label Keys */ 269 __slk_free(screen); 270 271 free(screen->stdbuf); 272 free(screen->unget_list); 273 if (_cursesi_screen == screen) 274 _cursesi_screen = NULL; 275 free(screen); 276 } 277 278 static void 279 __delscreen(SCREEN *screen) 280 { 281 struct __winlist *list; 282 283 /* free up the terminfo stuff */ 284 if (screen->term != NULL) 285 del_curterm(screen->term); 286 287 /* walk the window list and kill all the parent windows */ 288 while ((list = screen->winlistp) != NULL) { 289 delwin(list->winp); 290 if (list == screen->winlistp) 291 /* sanity - abort if window didn't remove itself */ 292 break; 293 } 294 } 295