1 /****************************************************************************
2  * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc.              *
3  *                                                                          *
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5  * copy of this software and associated documentation files (the            *
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11  *                                                                          *
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14  *                                                                          *
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22  *                                                                          *
23  * Except as contained in this notice, the name(s) of the above copyright   *
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28 
29 /****************************************************************************
30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32  *     and: Thomas E. Dickey                        1996-on                 *
33  *     and: Juergen Pfeifer                         2009                    *
34  ****************************************************************************/
35 
36 /*
37 **	lib_newterm.c
38 **
39 **	The newterm() function.
40 **
41 */
42 
43 #include <curses.priv.h>
44 
45 #ifndef CUR
46 #define CUR SP_TERMTYPE
47 #endif
48 
49 #include <tic.h>
50 
51 MODULE_ID("$Id: lib_newterm.c,v 1.90 2013/09/28 21:02:56 tom Exp $")
52 
53 #ifdef USE_TERM_DRIVER
54 #define NumLabels      InfoOf(SP_PARM).numlabels
55 #else
56 #define NumLabels      num_labels
57 #endif
58 
59 #ifndef ONLCR			/* Allows compilation under the QNX 4.2 OS */
60 #define ONLCR 0
61 #endif
62 
63 /*
64  * SVr4/XSI Curses specify that hardware echo is turned off in initscr, and not
65  * restored during the curses session.  The library simulates echo in software.
66  * (The behavior is unspecified if the application enables hardware echo).
67  *
68  * The newterm function also initializes terminal settings, and since initscr
69  * is supposed to behave as if it calls newterm, we do it here.
70  */
71 static NCURSES_INLINE int
72 _nc_initscr(NCURSES_SP_DCL0)
73 {
74     int result = ERR;
75     TERMINAL *term = TerminalOf(SP_PARM);
76 
77     /* for extended XPG4 conformance requires cbreak() at this point */
78     /* (SVr4 curses does this anyway) */
79     if (NCURSES_SP_NAME(cbreak) (NCURSES_SP_ARG) == OK) {
80 	TTY buf;
81 
82 	buf = term->Nttyb;
83 #ifdef TERMIOS
84 	buf.c_lflag &= (unsigned) ~(ECHO | ECHONL);
85 	buf.c_iflag &= (unsigned) ~(ICRNL | INLCR | IGNCR);
86 	buf.c_oflag &= (unsigned) ~(ONLCR);
87 #elif HAVE_SGTTY_H
88 	buf.sg_flags &= ~(ECHO | CRMOD);
89 #else
90 	memset(&buf, 0, sizeof(buf));
91 #endif
92 	result = NCURSES_SP_NAME(_nc_set_tty_mode) (NCURSES_SP_ARGx &buf);
93 	if (result == OK)
94 	    term->Nttyb = buf;
95     }
96     return result;
97 }
98 
99 /*
100  * filter() has to be called before either initscr() or newterm(), so there is
101  * apparently no way to make this flag apply to some terminals and not others,
102  * aside from possibly delaying a filter() call until some terminals have been
103  * initialized.
104  */
105 NCURSES_EXPORT(void)
106 NCURSES_SP_NAME(filter) (NCURSES_SP_DCL0)
107 {
108     START_TRACE();
109     T((T_CALLED("filter(%p)"), (void *) SP_PARM));
110 #if NCURSES_SP_FUNCS
111     if (IsPreScreen(SP_PARM)) {
112 	SP_PARM->_filtered = TRUE;
113     }
114 #else
115     _nc_prescreen.filter_mode = TRUE;
116 #endif
117     returnVoid;
118 }
119 
120 #if NCURSES_SP_FUNCS
121 NCURSES_EXPORT(void)
122 filter(void)
123 {
124     START_TRACE();
125     T((T_CALLED("filter()")));
126     _nc_prescreen.filter_mode = TRUE;
127     returnVoid;
128 }
129 #endif
130 
131 #if NCURSES_EXT_FUNCS
132 /*
133  * An extension, allowing the application to open a new screen without
134  * requiring it to also be filtered.
135  */
136 NCURSES_EXPORT(void)
137 NCURSES_SP_NAME(nofilter) (NCURSES_SP_DCL0)
138 {
139     START_TRACE();
140     T((T_CALLED("nofilter(%p)"), (void *) SP_PARM));
141 #if NCURSES_SP_FUNCS
142     if (IsPreScreen(SP_PARM)) {
143 	SP_PARM->_filtered = FALSE;
144     }
145 #else
146     _nc_prescreen.filter_mode = FALSE;
147 #endif
148     returnVoid;
149 }
150 
151 #if NCURSES_SP_FUNCS
152 NCURSES_EXPORT(void)
153 nofilter(void)
154 {
155     START_TRACE();
156     T((T_CALLED("nofilter()")));
157     _nc_prescreen.filter_mode = FALSE;
158     returnVoid;
159 }
160 #endif
161 #endif /* NCURSES_EXT_FUNCS */
162 
163 NCURSES_EXPORT(SCREEN *)
164 NCURSES_SP_NAME(newterm) (NCURSES_SP_DCLx
165 			  NCURSES_CONST char *name,
166 			  FILE *ofp,
167 			  FILE *ifp)
168 {
169     int value;
170     int errret;
171     SCREEN *result = 0;
172     SCREEN *current;
173     TERMINAL *its_term;
174     FILE *_ofp = ofp ? ofp : stdout;
175     FILE *_ifp = ifp ? ifp : stdin;
176     int cols;
177     int slk_format;
178     int filter_mode;
179     TERMINAL *new_term = 0;
180 
181     START_TRACE();
182     T((T_CALLED("newterm(%p, \"%s\", %p,%p)"),
183        (void *) SP_PARM,
184        (name ? name : ""),
185        (void *) ofp,
186        (void *) ifp));
187 
188 #if NCURSES_SP_FUNCS
189     assert(SP_PARM != 0);
190     if (SP_PARM == 0)
191 	returnSP(SP_PARM);
192 #endif
193 
194     _nc_init_pthreads();
195     _nc_lock_global(curses);
196 
197     current = CURRENT_SCREEN;
198     its_term = (current ? current->_term : 0);
199 
200     INIT_TERM_DRIVER();
201     /* this loads the capability entry, then sets LINES and COLS */
202     if (
203 #if NCURSES_SP_FUNCS
204 	   SP_PARM->_prescreen &&
205 #endif
206 	   TINFO_SETUP_TERM(&new_term, name,
207 			    fileno(_ofp), &errret, FALSE) != ERR) {
208 
209 	_nc_set_screen(0);
210 #ifdef USE_TERM_DRIVER
211 	assert(new_term != 0);
212 #endif
213 
214 #if NCURSES_SP_FUNCS
215 	slk_format = SP_PARM->slk_format;
216 	filter_mode = SP_PARM->_filtered;
217 #else
218 	slk_format = _nc_globals.slk_format;
219 	filter_mode = _nc_prescreen.filter_mode;
220 #endif
221 
222 	/*
223 	 * This actually allocates the screen structure, and saves the original
224 	 * terminal settings.
225 	 */
226 	if (NCURSES_SP_NAME(_nc_setupscreen) (
227 #if NCURSES_SP_FUNCS
228 						 &SP_PARM,
229 #endif
230 						 *(ptrLines(SP_PARM)),
231 						 *(ptrCols(SP_PARM)),
232 						 _ofp,
233 						 filter_mode,
234 						 slk_format) == ERR) {
235 	    _nc_set_screen(current);
236 	    result = 0;
237 	} else {
238 #ifdef USE_TERM_DRIVER
239 	    TERMINAL_CONTROL_BLOCK *TCB;
240 #elif !NCURSES_SP_FUNCS
241 	    _nc_set_screen(CURRENT_SCREEN);
242 #endif
243 	    assert(SP_PARM != 0);
244 	    cols = *(ptrCols(SP_PARM));
245 #ifdef USE_TERM_DRIVER
246 	    _nc_set_screen(SP_PARM);
247 	    TCB = (TERMINAL_CONTROL_BLOCK *) new_term;
248 	    TCB->csp = SP_PARM;
249 #endif
250 	    /*
251 	     * In setupterm() we did a set_curterm(), but it was before we set
252 	     * CURRENT_SCREEN.  So the "current" screen's terminal pointer was
253 	     * overwritten with a different terminal.  Later, in
254 	     * _nc_setupscreen(), we set CURRENT_SCREEN and the terminal
255 	     * pointer in the new screen.
256 	     *
257 	     * Restore the terminal-pointer for the pre-existing screen, if
258 	     * any.
259 	     */
260 	    if (current)
261 		current->_term = its_term;
262 
263 #ifdef USE_TERM_DRIVER
264 	    SP_PARM->_term = new_term;
265 #else
266 	    new_term = SP_PARM->_term;
267 #endif
268 
269 	    /* allow user to set maximum escape delay from the environment */
270 	    if ((value = _nc_getenv_num("ESCDELAY")) >= 0) {
271 		NCURSES_SP_NAME(set_escdelay) (NCURSES_SP_ARGx value);
272 	    }
273 
274 	    /* if the terminal type has real soft labels, set those up */
275 	    if (slk_format && NumLabels > 0 && SLK_STDFMT(slk_format))
276 		_nc_slk_initialize(StdScreen(SP_PARM), cols);
277 
278 	    SP_PARM->_ifd = fileno(_ifp);
279 	    NCURSES_SP_NAME(typeahead) (NCURSES_SP_ARGx fileno(_ifp));
280 #ifdef TERMIOS
281 	    SP_PARM->_use_meta = ((new_term->Ottyb.c_cflag & CSIZE) == CS8 &&
282 				  !(new_term->Ottyb.c_iflag & ISTRIP)) ||
283 		USE_KLIBC_KBD;
284 #else
285 	    SP_PARM->_use_meta = FALSE;
286 #endif
287 	    SP_PARM->_endwin = FALSE;
288 #ifndef USE_TERM_DRIVER
289 	    /*
290 	     * Check whether we can optimize scrolling under dumb terminals in
291 	     * case we do not have any of these capabilities, scrolling
292 	     * optimization will be useless.
293 	     */
294 	    SP_PARM->_scrolling = ((scroll_forward && scroll_reverse) ||
295 				   ((parm_rindex ||
296 				     parm_insert_line ||
297 				     insert_line) &&
298 				    (parm_index ||
299 				     parm_delete_line ||
300 				     delete_line)));
301 #endif
302 
303 	    NCURSES_SP_NAME(baudrate) (NCURSES_SP_ARG);		/* sets a field in the screen structure */
304 
305 	    SP_PARM->_keytry = 0;
306 
307 	    /* compute movement costs so we can do better move optimization */
308 #ifdef USE_TERM_DRIVER
309 	    TCBOf(SP_PARM)->drv->scinit(SP_PARM);
310 #else /* ! USE_TERM_DRIVER */
311 	    /*
312 	     * Check for mismatched graphic-rendition capabilities.  Most SVr4
313 	     * terminfo trees contain entries that have rmul or rmso equated to
314 	     * sgr0 (Solaris curses copes with those entries).  We do this only
315 	     * for curses, since many termcap applications assume that
316 	     * smso/rmso and smul/rmul are paired, and will not function
317 	     * properly if we remove rmso or rmul.  Curses applications
318 	     * shouldn't be looking at this detail.
319 	     */
320 #define SGR0_TEST(mode) (mode != 0) && (exit_attribute_mode == 0 || strcmp(mode, exit_attribute_mode))
321 	    SP_PARM->_use_rmso = SGR0_TEST(exit_standout_mode);
322 	    SP_PARM->_use_rmul = SGR0_TEST(exit_underline_mode);
323 #if USE_ITALIC
324 	    SP_PARM->_use_ritm = SGR0_TEST(exit_italics_mode);
325 #endif
326 
327 	    /* compute movement costs so we can do better move optimization */
328 	    _nc_mvcur_init();
329 
330 	    /* initialize terminal to a sane state */
331 	    _nc_screen_init();
332 #endif /* USE_TERM_DRIVER */
333 
334 	    /* Initialize the terminal line settings. */
335 	    _nc_initscr(NCURSES_SP_ARG);
336 
337 	    _nc_signal_handler(TRUE);
338 	    result = SP_PARM;
339 	}
340     }
341     _nc_unlock_global(curses);
342     returnSP(result);
343 }
344 
345 #if NCURSES_SP_FUNCS
346 NCURSES_EXPORT(SCREEN *)
347 newterm(NCURSES_CONST char *name, FILE *ofp, FILE *ifp)
348 {
349     return NCURSES_SP_NAME(newterm) (CURRENT_SCREEN_PRE, name, ofp, ifp);
350 }
351 #endif
352