1 /****************************************************************************
2  * Copyright 2018,2020 Thomas E. Dickey                                     *
3  * Copyright 1998-2016,2017 Free Software Foundation, Inc.                  *
4  *                                                                          *
5  * Permission is hereby granted, free of charge, to any person obtaining a  *
6  * copy of this software and associated documentation files (the            *
7  * "Software"), to deal in the Software without restriction, including      *
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9  * distribute, distribute with modifications, sublicense, and/or sell       *
10  * copies of the Software, and to permit persons to whom the Software is    *
11  * furnished to do so, subject to the following conditions:                 *
12  *                                                                          *
13  * The above copyright notice and this permission notice shall be included  *
14  * in all copies or substantial portions of the Software.                   *
15  *                                                                          *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
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20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23  *                                                                          *
24  * Except as contained in this notice, the name(s) of the above copyright   *
25  * holders shall not be used in advertising or otherwise to promote the     *
26  * sale, use or other dealings in this Software without prior written       *
27  * authorization.                                                           *
28  ****************************************************************************/
29 
30 /****************************************************************************
31  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
32  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
33  *     and: Thomas E. Dickey                        1996-on                 *
34  *     and: Juergen Pfeifer                         2009                    *
35  ****************************************************************************/
36 
37 /*
38 **	lib_newterm.c
39 **
40 **	The newterm() function.
41 **
42 */
43 
44 #include <curses.priv.h>
45 
46 #ifndef CUR
47 #define CUR SP_TERMTYPE
48 #endif
49 
50 #include <tic.h>
51 
52 MODULE_ID("$Id: lib_newterm.c,v 1.103 2020/09/05 21:34:04 tom Exp $")
53 
54 #ifdef USE_TERM_DRIVER
55 #define NumLabels      InfoOf(SP_PARM).numlabels
56 #else
57 #define NumLabels      num_labels
58 #endif
59 
60 #ifndef ONLCR			/* Allows compilation under the QNX 4.2 OS */
61 #define ONLCR 0
62 #endif
63 
64 /*
65  * SVr4/XSI Curses specify that hardware echo is turned off in initscr, and not
66  * restored during the curses session.  The library simulates echo in software.
67  * (The behavior is unspecified if the application enables hardware echo).
68  *
69  * The newterm function also initializes terminal settings, and since initscr
70  * is supposed to behave as if it calls newterm, we do it here.
71  */
72 static NCURSES_INLINE int
73 _nc_initscr(NCURSES_SP_DCL0)
74 {
75     int result = ERR;
76     TERMINAL *term = TerminalOf(SP_PARM);
77 
78     /* for extended XPG4 conformance requires cbreak() at this point */
79     /* (SVr4 curses does this anyway) */
80     T((T_CALLED("_nc_initscr(%p) ->term %p"), (void *) SP_PARM, (void *) term));
81     if (NCURSES_SP_NAME(cbreak) (NCURSES_SP_ARG) == OK) {
82 	TTY buf;
83 
84 	buf = term->Nttyb;
85 #ifdef TERMIOS
86 	buf.c_lflag &= (unsigned) ~(ECHO | ECHONL);
87 	buf.c_iflag &= (unsigned) ~(ICRNL | INLCR | IGNCR);
88 	buf.c_oflag &= (unsigned) ~(ONLCR);
89 #elif HAVE_SGTTY_H
90 	buf.sg_flags &= ~(ECHO | CRMOD);
91 #elif defined(EXP_WIN32_DRIVER)
92 	buf.dwFlagIn = CONMODE_IN_DEFAULT;
93 	buf.dwFlagOut = CONMODE_OUT_DEFAULT | VT_FLAG_OUT;
94 	if (WINCONSOLE.isTermInfoConsole) {
95 	    buf.dwFlagIn |= VT_FLAG_IN;
96 	}
97 #else
98 	memset(&buf, 0, sizeof(buf));
99 #endif
100 	result = NCURSES_SP_NAME(_nc_set_tty_mode) (NCURSES_SP_ARGx &buf);
101 	if (result == OK)
102 	    term->Nttyb = buf;
103     }
104     returnCode(result);
105 }
106 
107 /*
108  * filter() has to be called before either initscr() or newterm(), so there is
109  * apparently no way to make this flag apply to some terminals and not others,
110  * aside from possibly delaying a filter() call until some terminals have been
111  * initialized.
112  */
113 NCURSES_EXPORT(void)
114 NCURSES_SP_NAME(filter) (NCURSES_SP_DCL0)
115 {
116     START_TRACE();
117     T((T_CALLED("filter(%p)"), (void *) SP_PARM));
118 #if NCURSES_SP_FUNCS
119     if (IsPreScreen(SP_PARM)) {
120 	SP_PARM->_filtered = TRUE;
121     }
122 #else
123     _nc_prescreen.filter_mode = TRUE;
124 #endif
125     returnVoid;
126 }
127 
128 #if NCURSES_SP_FUNCS
129 NCURSES_EXPORT(void)
130 filter(void)
131 {
132     START_TRACE();
133     T((T_CALLED("filter()")));
134     _nc_prescreen.filter_mode = TRUE;
135     returnVoid;
136 }
137 #endif
138 
139 #if NCURSES_EXT_FUNCS
140 /*
141  * An extension, allowing the application to open a new screen without
142  * requiring it to also be filtered.
143  */
144 NCURSES_EXPORT(void)
145 NCURSES_SP_NAME(nofilter) (NCURSES_SP_DCL0)
146 {
147     START_TRACE();
148     T((T_CALLED("nofilter(%p)"), (void *) SP_PARM));
149 #if NCURSES_SP_FUNCS
150     if (IsPreScreen(SP_PARM)) {
151 	SP_PARM->_filtered = FALSE;
152     }
153 #else
154     _nc_prescreen.filter_mode = FALSE;
155 #endif
156     returnVoid;
157 }
158 
159 #if NCURSES_SP_FUNCS
160 NCURSES_EXPORT(void)
161 nofilter(void)
162 {
163     START_TRACE();
164     T((T_CALLED("nofilter()")));
165     _nc_prescreen.filter_mode = FALSE;
166     returnVoid;
167 }
168 #endif
169 #endif /* NCURSES_EXT_FUNCS */
170 
171 NCURSES_EXPORT(SCREEN *)
172 NCURSES_SP_NAME(newterm) (NCURSES_SP_DCLx
173 			  const char *name,
174 			  FILE *ofp,
175 			  FILE *ifp)
176 {
177     int errret;
178     SCREEN *result = 0;
179     SCREEN *current;
180     TERMINAL *its_term;
181     FILE *_ofp = ofp ? ofp : stdout;
182     FILE *_ifp = ifp ? ifp : stdin;
183     TERMINAL *new_term = 0;
184 
185     START_TRACE();
186     T((T_CALLED("newterm(%p, \"%s\", %p,%p)"),
187        (void *) SP_PARM,
188        (name ? name : ""),
189        (void *) ofp,
190        (void *) ifp));
191 
192 #if NCURSES_SP_FUNCS
193     assert(SP_PARM != 0);
194     if (SP_PARM == 0)
195 	returnSP(SP_PARM);
196 #endif
197 
198     _nc_init_pthreads();
199     _nc_lock_global(curses);
200 
201     current = CURRENT_SCREEN;
202     its_term = (current ? current->_term : 0);
203 
204 #if defined(EXP_WIN32_DRIVER)
205     _setmode(fileno(_ifp), _O_BINARY);
206     _setmode(fileno(_ofp), _O_BINARY);
207 #endif
208 
209     INIT_TERM_DRIVER();
210     /* this loads the capability entry, then sets LINES and COLS */
211     if (
212 	   TINFO_SETUP_TERM(&new_term, name,
213 			    fileno(_ofp), &errret, FALSE) != ERR) {
214 	int slk_format;
215 	int filter_mode;
216 
217 	_nc_set_screen(0);
218 #ifdef USE_TERM_DRIVER
219 	assert(new_term != 0);
220 #endif
221 
222 #if NCURSES_SP_FUNCS
223 	slk_format = SP_PARM->slk_format;
224 	filter_mode = SP_PARM->_filtered;
225 #else
226 	slk_format = _nc_globals.slk_format;
227 	filter_mode = _nc_prescreen.filter_mode;
228 #endif
229 
230 	/*
231 	 * This actually allocates the screen structure, and saves the original
232 	 * terminal settings.
233 	 */
234 	if (NCURSES_SP_NAME(_nc_setupscreen) (
235 #if NCURSES_SP_FUNCS
236 						 &SP_PARM,
237 #endif
238 						 *(ptrLines(SP_PARM)),
239 						 *(ptrCols(SP_PARM)),
240 						 _ofp,
241 						 filter_mode,
242 						 slk_format) == ERR) {
243 	    _nc_set_screen(current);
244 	    result = 0;
245 	} else {
246 	    int value;
247 	    int cols;
248 
249 #ifdef USE_TERM_DRIVER
250 	    TERMINAL_CONTROL_BLOCK *TCB;
251 #elif !NCURSES_SP_FUNCS
252 	    _nc_set_screen(CURRENT_SCREEN);
253 #endif
254 	    assert(SP_PARM != 0);
255 	    cols = *(ptrCols(SP_PARM));
256 #ifdef USE_TERM_DRIVER
257 	    _nc_set_screen(SP_PARM);
258 	    TCB = (TERMINAL_CONTROL_BLOCK *) new_term;
259 	    TCB->csp = SP_PARM;
260 #endif
261 	    /*
262 	     * In setupterm() we did a set_curterm(), but it was before we set
263 	     * CURRENT_SCREEN.  So the "current" screen's terminal pointer was
264 	     * overwritten with a different terminal.  Later, in
265 	     * _nc_setupscreen(), we set CURRENT_SCREEN and the terminal
266 	     * pointer in the new screen.
267 	     *
268 	     * Restore the terminal-pointer for the pre-existing screen, if
269 	     * any.
270 	     */
271 	    if (current)
272 		current->_term = its_term;
273 
274 #ifdef USE_TERM_DRIVER
275 	    SP_PARM->_term = new_term;
276 #else
277 	    new_term = SP_PARM->_term;
278 #endif
279 
280 	    /* allow user to set maximum escape delay from the environment */
281 	    if ((value = _nc_getenv_num("ESCDELAY")) >= 0) {
282 #if NCURSES_EXT_FUNCS
283 		NCURSES_SP_NAME(set_escdelay) (NCURSES_SP_ARGx value);
284 #else
285 		ESCDELAY = value;
286 #endif
287 	    }
288 
289 	    /* if the terminal type has real soft labels, set those up */
290 	    if (slk_format && NumLabels > 0 && SLK_STDFMT(slk_format))
291 		_nc_slk_initialize(StdScreen(SP_PARM), cols);
292 
293 	    SP_PARM->_ifd = fileno(_ifp);
294 	    NCURSES_SP_NAME(typeahead) (NCURSES_SP_ARGx fileno(_ifp));
295 #ifdef TERMIOS
296 	    SP_PARM->_use_meta = ((new_term->Ottyb.c_cflag & CSIZE) == CS8 &&
297 				  !(new_term->Ottyb.c_iflag & ISTRIP)) ||
298 		USE_KLIBC_KBD;
299 #else
300 	    SP_PARM->_use_meta = FALSE;
301 #endif
302 	    SP_PARM->_endwin = ewInitial;
303 #ifndef USE_TERM_DRIVER
304 	    /*
305 	     * Check whether we can optimize scrolling under dumb terminals in
306 	     * case we do not have any of these capabilities, scrolling
307 	     * optimization will be useless.
308 	     */
309 	    SP_PARM->_scrolling = ((scroll_forward && scroll_reverse) ||
310 				   ((parm_rindex ||
311 				     parm_insert_line ||
312 				     insert_line) &&
313 				    (parm_index ||
314 				     parm_delete_line ||
315 				     delete_line)));
316 #endif
317 
318 	    NCURSES_SP_NAME(baudrate) (NCURSES_SP_ARG);		/* sets a field in the screen structure */
319 
320 	    SP_PARM->_keytry = 0;
321 
322 	    /* compute movement costs so we can do better move optimization */
323 #ifdef USE_TERM_DRIVER
324 	    TCBOf(SP_PARM)->drv->td_scinit(SP_PARM);
325 #else /* ! USE_TERM_DRIVER */
326 	    /*
327 	     * Check for mismatched graphic-rendition capabilities.  Most SVr4
328 	     * terminfo trees contain entries that have rmul or rmso equated to
329 	     * sgr0 (Solaris curses copes with those entries).  We do this only
330 	     * for curses, since many termcap applications assume that
331 	     * smso/rmso and smul/rmul are paired, and will not function
332 	     * properly if we remove rmso or rmul.  Curses applications
333 	     * shouldn't be looking at this detail.
334 	     */
335 #define SGR0_TEST(mode) (mode != 0) && (exit_attribute_mode == 0 || strcmp(mode, exit_attribute_mode))
336 	    SP_PARM->_use_rmso = SGR0_TEST(exit_standout_mode);
337 	    SP_PARM->_use_rmul = SGR0_TEST(exit_underline_mode);
338 #if USE_ITALIC
339 	    SP_PARM->_use_ritm = SGR0_TEST(exit_italics_mode);
340 #endif
341 
342 	    /* compute movement costs so we can do better move optimization */
343 	    _nc_mvcur_init();
344 
345 	    /* initialize terminal to a sane state */
346 	    _nc_screen_init();
347 #endif /* USE_TERM_DRIVER */
348 
349 	    /* Initialize the terminal line settings. */
350 	    _nc_initscr(NCURSES_SP_ARG);
351 
352 	    _nc_signal_handler(TRUE);
353 	    result = SP_PARM;
354 	}
355     }
356     _nc_unlock_global(curses);
357     returnSP(result);
358 }
359 
360 #if NCURSES_SP_FUNCS
361 NCURSES_EXPORT(SCREEN *)
362 newterm(const char *name, FILE *ofp, FILE *ifp)
363 {
364     SCREEN *rc;
365     _nc_lock_global(prescreen);
366     START_TRACE();
367     rc = NCURSES_SP_NAME(newterm) (CURRENT_SCREEN_PRE, name, ofp, ifp);
368     _nc_forget_prescr();
369     _nc_unlock_global(prescreen);
370     return rc;
371 }
372 #endif
373