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      *
8 * without limitation the rights to use, copy, modify, merge, publish,      *
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.   *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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_set_term.c
39**
40**	The routine set_term().
41**
42*/
43
44#include <curses.priv.h>
45#include <tic.h>
46
47#if USE_GPM_SUPPORT
48#ifdef HAVE_LIBDL
49/* use dynamic loader to avoid linkage dependency */
50#include <dlfcn.h>
51#endif
52#endif
53
54#undef CUR
55#define CUR SP_TERMTYPE
56
57MODULE_ID("$Id: lib_set_term.c,v 1.175 2020/10/10 19:09:03 juergen Exp $")
58
59#ifdef USE_TERM_DRIVER
60#define MaxColors      InfoOf(sp).maxcolors
61#define NumLabels      InfoOf(sp).numlabels
62#else
63#define MaxColors      max_colors
64#define NumLabels      num_labels
65#endif
66
67NCURSES_EXPORT(SCREEN *)
68set_term(SCREEN *screenp)
69{
70    SCREEN *oldSP;
71    SCREEN *newSP;
72
73    T((T_CALLED("set_term(%p)"), (void *) screenp));
74
75    _nc_lock_global(curses);
76
77    oldSP = CURRENT_SCREEN;
78    _nc_set_screen(screenp);
79    newSP = screenp;
80
81    if (newSP != 0) {
82	TINFO_SET_CURTERM(newSP, newSP->_term);
83#if !USE_REENTRANT
84	curscr = CurScreen(newSP);
85	newscr = NewScreen(newSP);
86	stdscr = StdScreen(newSP);
87	COLORS = newSP->_color_count;
88	COLOR_PAIRS = newSP->_pair_count;
89#endif
90    } else {
91	TINFO_SET_CURTERM(oldSP, 0);
92#if !USE_REENTRANT
93	curscr = 0;
94	newscr = 0;
95	stdscr = 0;
96	COLORS = 0;
97	COLOR_PAIRS = 0;
98#endif
99    }
100
101    _nc_unlock_global(curses);
102
103    T((T_RETURN("%p"), (void *) oldSP));
104    return (oldSP);
105}
106
107static void
108_nc_free_keytry(TRIES * kt)
109{
110    if (kt != 0) {
111	_nc_free_keytry(kt->child);
112	_nc_free_keytry(kt->sibling);
113	free(kt);
114    }
115}
116
117static bool
118delink_screen(SCREEN *sp)
119{
120    SCREEN *last = 0;
121    SCREEN *temp;
122    bool result = FALSE;
123
124    for (each_screen(temp)) {
125	if (temp == sp) {
126	    if (last)
127		last->_next_screen = sp->_next_screen;
128	    else
129		_nc_screen_chain = sp->_next_screen;
130	    result = TRUE;
131	    break;
132	}
133	last = temp;
134    }
135    return result;
136}
137
138/*
139 * Free the storage associated with the given SCREEN sp.
140 */
141NCURSES_EXPORT(void)
142delscreen(SCREEN *sp)
143{
144
145    T((T_CALLED("delscreen(%p)"), (void *) sp));
146
147    _nc_lock_global(curses);
148    if (delink_screen(sp)) {
149#ifdef USE_SP_RIPOFF
150	ripoff_t *rop;
151	if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
152	    for (rop = safe_ripoff_stack;
153		 rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
154		 rop++) {
155		if (rop->win) {
156		    (void) delwin(rop->win);
157		    rop->win = 0;
158		}
159	    }
160	}
161#endif
162
163	(void) _nc_freewin(CurScreen(sp));
164	(void) _nc_freewin(NewScreen(sp));
165	(void) _nc_freewin(StdScreen(sp));
166
167	if (sp->_slk != 0) {
168
169	    if (sp->_slk->ent != 0) {
170		int i;
171
172		for (i = 0; i < sp->_slk->labcnt; ++i) {
173		    FreeIfNeeded(sp->_slk->ent[i].ent_text);
174		    FreeIfNeeded(sp->_slk->ent[i].form_text);
175		}
176		free(sp->_slk->ent);
177	    }
178	    free(sp->_slk);
179	    sp->_slk = 0;
180	}
181
182	_nc_free_keytry(sp->_keytry);
183	sp->_keytry = 0;
184
185	_nc_free_keytry(sp->_key_ok);
186	sp->_key_ok = 0;
187
188	FreeIfNeeded(sp->_current_attr);
189
190	FreeIfNeeded(sp->_color_table);
191	FreeIfNeeded(sp->_color_pairs);
192
193	FreeIfNeeded(sp->_oldnum_list);
194	FreeIfNeeded(sp->oldhash);
195	FreeIfNeeded(sp->newhash);
196	FreeIfNeeded(sp->hashtab);
197
198	FreeIfNeeded(sp->_acs_map);
199	FreeIfNeeded(sp->_screen_acs_map);
200
201	NCURSES_SP_NAME(_nc_flush) (NCURSES_SP_ARG);
202	NCURSES_SP_NAME(del_curterm) (NCURSES_SP_ARGx sp->_term);
203	FreeIfNeeded(sp->out_buffer);
204	if (_nc_find_prescr() == sp) {
205	    _nc_forget_prescr();
206	}
207#if USE_GPM_SUPPORT
208#ifdef HAVE_LIBDL
209	if (sp->_dlopen_gpm != 0) {
210	    dlclose(sp->_dlopen_gpm);
211	    sp->_dlopen_gpm = 0;
212	}
213#endif
214#endif /* USE_GPM_SUPPORT */
215	free(sp);
216
217	/*
218	 * If this was the current screen, reset everything that the
219	 * application might try to use (except cur_term, which may have
220	 * multiple references in different screens).
221	 */
222	if (sp == CURRENT_SCREEN) {
223#if !USE_REENTRANT
224	    curscr = 0;
225	    newscr = 0;
226	    stdscr = 0;
227	    COLORS = 0;
228	    COLOR_PAIRS = 0;
229#endif
230	    _nc_set_screen(0);
231#if USE_WIDEC_SUPPORT
232	    if (SP == 0) {
233		FreeIfNeeded(_nc_wacs);
234		_nc_wacs = 0;
235	    }
236#endif
237	}
238    }
239    _nc_unlock_global(curses);
240
241    returnVoid;
242}
243
244static bool
245no_mouse_event(SCREEN *sp GCC_UNUSED)
246{
247    return FALSE;
248}
249
250static bool
251no_mouse_inline(SCREEN *sp GCC_UNUSED)
252{
253    return FALSE;
254}
255
256static bool
257no_mouse_parse(SCREEN *sp GCC_UNUSED, int code GCC_UNUSED)
258{
259    return TRUE;
260}
261
262static void
263no_mouse_resume(SCREEN *sp GCC_UNUSED)
264{
265}
266
267static void
268no_mouse_wrap(SCREEN *sp GCC_UNUSED)
269{
270}
271
272#if NCURSES_EXT_FUNCS && USE_COLORFGBG
273static const char *
274extract_fgbg(const char *src, int *result)
275{
276    const char *dst = 0;
277    char *tmp = 0;
278    long value = strtol(src, &tmp, 0);
279
280    if ((dst = tmp) == 0) {
281	dst = src;
282    } else if (value >= 0) {
283	*result = (int) value;
284    }
285    while (*dst != 0 && *dst != ';')
286	dst++;
287    if (*dst == ';')
288	dst++;
289    return dst;
290}
291#endif
292
293#define ReturnScreenError() do { _nc_set_screen(0); \
294                            returnCode(ERR); } while (0)
295
296/* OS-independent screen initializations */
297NCURSES_EXPORT(int)
298NCURSES_SP_NAME(_nc_setupscreen) (
299#if NCURSES_SP_FUNCS
300				     SCREEN **spp,
301#endif
302				     int slines,
303				     int scolumns,
304				     FILE *output,
305				     int filtered,
306				     int slk_format)
307{
308#ifndef USE_TERM_DRIVER
309    static const TTY null_TTY;	/* all zeros iff uninitialized */
310#endif
311    char *env;
312    int bottom_stolen = 0;
313    SCREEN *sp;
314#ifndef USE_TERM_DRIVER
315    bool support_cookies = USE_XMC_SUPPORT;
316#endif
317
318    T((T_CALLED("_nc_setupscreen(%d, %d, %p, %d, %d)"),
319       slines, scolumns, (void *) output, filtered, slk_format));
320
321    assert(CURRENT_SCREEN == 0);	/* has been reset in newterm() ! */
322
323#if NCURSES_SP_FUNCS
324    assert(spp != 0);
325    sp = *spp;
326
327    if (!sp) {
328	sp = _nc_alloc_screen_sp();
329	T(("_nc_alloc_screen_sp %p", (void *) sp));
330	*spp = sp;
331    }
332    if (!sp
333	|| ((sp->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
334	|| ((sp->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
335	ReturnScreenError();
336    }
337
338    T(("created SP %p", (void *) sp));
339    sp->_next_screen = _nc_screen_chain;
340    _nc_screen_chain = sp;
341
342    if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0) {
343	ReturnScreenError();
344    }
345#else
346    if (!_nc_alloc_screen()
347	|| ((SP->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
348	|| ((SP->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
349	returnCode(ERR);
350    }
351
352    T(("created SP %p", (void *) SP));
353
354    sp = SP;			/* fixup so SET_LINES and SET_COLS works */
355    sp->_next_screen = _nc_screen_chain;
356    _nc_screen_chain = sp;
357
358    if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0) {
359	returnCode(ERR);
360    }
361#endif
362
363    /*
364     * We should always check the screensize, just in case.
365     */
366    _nc_set_screen(sp);
367    sp->_term = cur_term;
368#ifdef USE_TERM_DRIVER
369    TCBOf(sp)->csp = sp;
370    _nc_get_screensize(sp, sp->_term, &slines, &scolumns);
371#else
372    _nc_get_screensize(sp, &slines, &scolumns);
373#endif
374    SET_LINES(slines);
375    SET_COLS(scolumns);
376
377    T((T_CREATE("screen %s %dx%d"),
378       NCURSES_SP_NAME(termname) (NCURSES_SP_ARG), slines, scolumns));
379
380    sp->_filtered = filtered;
381
382    /* implement filter mode */
383    if (filtered) {
384	slines = 1;
385	SET_LINES(slines);
386#ifdef USE_TERM_DRIVER
387	CallDriver(sp, td_setfilter);
388#else
389	/* *INDENT-EQLS* */
390	clear_screen     = ABSENT_STRING;
391	cursor_address   = ABSENT_STRING;
392	cursor_down      = ABSENT_STRING;
393	cursor_up        = ABSENT_STRING;
394	parm_down_cursor = ABSENT_STRING;
395	parm_up_cursor   = ABSENT_STRING;
396	row_address      = ABSENT_STRING;
397	cursor_home      = carriage_return;
398
399	if (back_color_erase)
400	    clr_eos = ABSENT_STRING;
401
402#endif
403	T(("filter screensize %dx%d", slines, scolumns));
404    }
405#ifdef __DJGPP__
406    T(("setting output mode to binary"));
407    fflush(output);
408    setmode(output, O_BINARY);
409#endif
410#if defined(EXP_WIN32_DRIVER)
411    T(("setting output mode to binary"));
412    fflush(output);
413    _setmode(fileno(output), _O_BINARY);
414#endif
415    NCURSES_SP_NAME(_nc_set_buffer) (NCURSES_SP_ARGx output, TRUE);
416    sp->_lines = (NCURSES_SIZE_T) slines;
417    sp->_lines_avail = (NCURSES_SIZE_T) slines;
418    sp->_columns = (NCURSES_SIZE_T) scolumns;
419
420    fflush(output);
421    sp->_ofd = output ? fileno(output) : -1;
422    sp->_ofp = output;
423#if defined(EXP_WIN32_DRIVER)
424    if (output)
425	_setmode(fileno(output), _O_BINARY);
426#endif
427    sp->out_limit = (size_t) ((2 + slines) * (6 + scolumns));
428    if ((sp->out_buffer = malloc(sp->out_limit)) == 0)
429	sp->out_limit = 0;
430    sp->out_inuse = 0;
431
432    SP_PRE_INIT(sp);
433    SetNoPadding(sp);
434
435#if NCURSES_EXT_FUNCS
436    sp->_default_color = FALSE;
437    sp->_has_sgr_39_49 = FALSE;
438
439    /*
440     * Set our assumption of the terminal's default foreground and background
441     * colors.  The curs_color man-page states that we can assume that the
442     * background is black.  The origin of this assumption appears to be
443     * terminals that displayed colored text, but no colored backgrounds, e.g.,
444     * the first colored terminals around 1980.  More recent ones with better
445     * technology can display not only colored backgrounds, but all
446     * combinations.  So a terminal might be something other than "white" on
447     * black (green/black looks monochrome too), but black on white or even
448     * on ivory.
449     *
450     * White-on-black is the simplest thing to use for monochrome.  Almost
451     * all applications that use color paint both text and background, so
452     * the distinction is moot.  But a few do not - which is why we leave this
453     * configurable (a better solution is to use assume_default_colors() for
454     * the rare applications that do require that sort of appearance, since
455     * is appears that more users expect to be able to make a white-on-black
456     * or black-on-white display under control of the application than not).
457     */
458#ifdef USE_ASSUMED_COLOR
459    sp->_default_fg = COLOR_WHITE;
460    sp->_default_bg = COLOR_BLACK;
461#else
462    sp->_default_fg = COLOR_DEFAULT;
463    sp->_default_bg = COLOR_DEFAULT;
464#endif
465
466    /*
467     * Allow those assumed/default color assumptions to be overridden at
468     * runtime:
469     */
470    if ((env = getenv("NCURSES_ASSUMED_COLORS")) != 0) {
471	int fg, bg;
472	char sep1, sep2;
473	int count = sscanf(env, "%d%c%d%c", &fg, &sep1, &bg, &sep2);
474	if (count >= 1) {
475	    sp->_default_fg = ((fg >= 0 && fg < MaxColors) ? fg : COLOR_DEFAULT);
476	    if (count >= 3) {
477		sp->_default_bg = ((bg >= 0 && bg < MaxColors) ? bg : COLOR_DEFAULT);
478	    }
479	    TR(TRACE_CHARPUT | TRACE_MOVE,
480	       ("from environment assumed fg=%d, bg=%d",
481		sp->_default_fg,
482		sp->_default_bg));
483	}
484    }
485#if USE_COLORFGBG
486    /*
487     * If rxvt's $COLORFGBG variable is set, use it to specify the assumed
488     * default colors.  Note that rxvt (mis)uses bold colors, equating a bold
489     * color to that value plus 8.  We'll only use the non-bold color for now -
490     * decide later if it is worth having default attributes as well.
491     */
492    if (getenv("COLORFGBG") != 0) {
493	const char *p = getenv("COLORFGBG");
494	TR(TRACE_CHARPUT | TRACE_MOVE, ("decoding COLORFGBG %s", p));
495	p = extract_fgbg(p, &(sp->_default_fg));
496	p = extract_fgbg(p, &(sp->_default_bg));
497	if (*p)			/* assume rxvt was compiled with xpm support */
498	    p = extract_fgbg(p, &(sp->_default_bg));
499	TR(TRACE_CHARPUT | TRACE_MOVE, ("decoded fg=%d, bg=%d",
500					sp->_default_fg, sp->_default_bg));
501	if (sp->_default_fg >= MaxColors) {
502	    if (set_a_foreground != ABSENT_STRING
503		&& !strcmp(set_a_foreground, "\033[3%p1%dm")) {
504		set_a_foreground = strdup("\033[3%?%p1%{8}%>%t9%e%p1%d%;m");
505	    } else {
506		sp->_default_fg %= MaxColors;
507	    }
508	}
509	if (sp->_default_bg >= MaxColors) {
510	    if (set_a_background != ABSENT_STRING
511		&& !strcmp(set_a_background, "\033[4%p1%dm")) {
512		set_a_background = strdup("\033[4%?%p1%{8}%>%t9%e%p1%d%;m");
513	    } else {
514		sp->_default_bg %= MaxColors;
515	    }
516	}
517    }
518#endif
519#endif /* NCURSES_EXT_FUNCS */
520
521    sp->_maxclick = DEFAULT_MAXCLICK;
522    sp->_mouse_event = no_mouse_event;
523    sp->_mouse_inline = no_mouse_inline;
524    sp->_mouse_parse = no_mouse_parse;
525    sp->_mouse_resume = no_mouse_resume;
526    sp->_mouse_wrap = no_mouse_wrap;
527    sp->_mouse_fd = -1;
528
529    /*
530     * If we've no magic cookie support, we suppress attributes that xmc would
531     * affect, i.e., the attributes that affect the rendition of a space.
532     */
533    sp->_ok_attributes = NCURSES_SP_NAME(termattrs) (NCURSES_SP_ARG);
534    if (NCURSES_SP_NAME(has_colors) (NCURSES_SP_ARG)) {
535	sp->_ok_attributes |= A_COLOR;
536    }
537#ifdef USE_TERM_DRIVER
538    _nc_cookie_init(sp);
539#else
540#if USE_XMC_SUPPORT
541    /*
542     * If we have no magic-cookie support compiled-in, or if it is suppressed
543     * in the environment, reset the support-flag.
544     */
545    if (magic_cookie_glitch >= 0) {
546	if (getenv("NCURSES_NO_MAGIC_COOKIE") != 0) {
547	    support_cookies = FALSE;
548	}
549    }
550#endif
551
552    if (!support_cookies && magic_cookie_glitch >= 0) {
553	T(("will disable attributes to work w/o magic cookies"));
554    }
555
556    if (magic_cookie_glitch > 0) {	/* tvi, wyse */
557
558	sp->_xmc_triggers = sp->_ok_attributes & XMC_CONFLICT;
559#if 0
560	/*
561	 * We "should" treat colors as an attribute.  The wyse350 (and its
562	 * clones) appear to be the only ones that have both colors and magic
563	 * cookies.
564	 */
565	if (has_colors()) {
566	    sp->_xmc_triggers |= A_COLOR;
567	}
568#endif
569	sp->_xmc_suppress = sp->_xmc_triggers & (chtype) ~(A_BOLD);
570
571	T(("magic cookie attributes %s", _traceattr(sp->_xmc_suppress)));
572	/*
573	 * Supporting line-drawing may be possible.  But make the regular
574	 * video attributes work first.
575	 */
576	acs_chars = ABSENT_STRING;
577	ena_acs = ABSENT_STRING;
578	enter_alt_charset_mode = ABSENT_STRING;
579	exit_alt_charset_mode = ABSENT_STRING;
580#if USE_XMC_SUPPORT
581	/*
582	 * To keep the cookie support simple, suppress all of the optimization
583	 * hooks except for clear_screen and the cursor addressing.
584	 */
585	if (support_cookies) {
586	    clr_eol = ABSENT_STRING;
587	    clr_eos = ABSENT_STRING;
588	    set_attributes = ABSENT_STRING;
589	}
590#endif
591    } else if (magic_cookie_glitch == 0) {	/* hpterm */
592    }
593
594    /*
595     * If magic cookies are not supported, cancel the strings that set
596     * video attributes.
597     */
598    if (!support_cookies && magic_cookie_glitch >= 0) {
599	magic_cookie_glitch = ABSENT_NUMERIC;
600	set_attributes = ABSENT_STRING;
601	enter_blink_mode = ABSENT_STRING;
602	enter_bold_mode = ABSENT_STRING;
603	enter_dim_mode = ABSENT_STRING;
604	enter_reverse_mode = ABSENT_STRING;
605	enter_standout_mode = ABSENT_STRING;
606	enter_underline_mode = ABSENT_STRING;
607    }
608
609    /* initialize normal acs before wide, since we use mapping in the latter */
610#if !USE_WIDEC_SUPPORT
611    if (_nc_unicode_locale() && _nc_locale_breaks_acs(sp->_term)) {
612	acs_chars = NULL;
613	ena_acs = NULL;
614	enter_alt_charset_mode = NULL;
615	exit_alt_charset_mode = NULL;
616	set_attributes = NULL;
617    }
618#endif
619#endif
620
621    NCURSES_SP_NAME(_nc_init_acs) (NCURSES_SP_ARG);
622#if USE_WIDEC_SUPPORT
623    sp->_screen_unicode = _nc_unicode_locale();
624    if (_nc_wacs == 0) {
625	_nc_init_wacs();
626    }
627    if (_nc_wacs == 0) {
628	ReturnScreenError();
629    }
630
631    sp->_screen_acs_fix = (sp->_screen_unicode
632			   && _nc_locale_breaks_acs(sp->_term));
633#endif
634    env = _nc_get_locale();
635    sp->_legacy_coding = ((env == 0)
636			  || !strcmp(env, "C")
637			  || !strcmp(env, "POSIX"));
638    T(("legacy-coding %d", sp->_legacy_coding));
639
640    sp->_nc_sp_idcok = TRUE;
641    sp->_nc_sp_idlok = FALSE;
642
643    sp->oldhash = 0;
644    sp->newhash = 0;
645
646    T(("creating newscr"));
647    NewScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
648					     0, 0);
649    if (NewScreen(sp) == 0) {
650	ReturnScreenError();
651    }
652    T(("creating curscr"));
653    CurScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
654					     0, 0);
655    if (CurScreen(sp) == 0) {
656	ReturnScreenError();
657    }
658#if !USE_REENTRANT
659    newscr = NewScreen(sp);
660    curscr = CurScreen(sp);
661#endif
662#if USE_SIZECHANGE
663    sp->_resize = NCURSES_SP_NAME(resizeterm);
664    sp->_ungetch = safe_ungetch;
665#endif
666
667    NewScreen(sp)->_clear = TRUE;
668    CurScreen(sp)->_clear = FALSE;
669
670    /*
671     * Get the current tty-modes. setupterm() may already have done this,
672     * unless we use the term-driver.
673     */
674#ifndef USE_TERM_DRIVER
675    if (cur_term != 0 &&
676	!memcmp(&cur_term->Ottyb, &null_TTY, sizeof(TTY)))
677#endif
678    {
679	NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
680	NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
681    }
682
683    if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
684	ripoff_t *rop;
685
686	for (rop = safe_ripoff_stack;
687	     rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
688	     rop++) {
689
690	    /* If we must simulate soft labels, grab off the line to be used.
691	       We assume that we must simulate, if it is none of the standard
692	       formats (4-4 or 3-2-3) for which there may be some hardware
693	       support. */
694	    if (rop->hook == _nc_slk_initialize) {
695		if (!(NumLabels <= 0 || !SLK_STDFMT(slk_format))) {
696		    continue;
697		}
698	    }
699	    if (rop->hook) {
700		int count;
701		WINDOW *w;
702
703		count = (rop->line < 0) ? -rop->line : rop->line;
704		T(("ripping off %i lines at %s", count,
705		   ((rop->line < 0)
706		    ? "bottom"
707		    : "top")));
708
709		w = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
710					     count, scolumns,
711					     ((rop->line < 0)
712					      ? sp->_lines_avail - count
713					      : 0),
714					     0);
715		if (w) {
716		    rop->win = w;
717		    rop->hook(w, scolumns);
718		} else {
719		    ReturnScreenError();
720		}
721		if (rop->line < 0) {
722		    bottom_stolen += count;
723		} else {
724		    sp->_topstolen = (NCURSES_SIZE_T) (sp->_topstolen + count);
725		}
726		sp->_lines_avail = (NCURSES_SIZE_T) (sp->_lines_avail - count);
727	    }
728	}
729	/* reset the stack */
730	safe_ripoff_sp = safe_ripoff_stack;
731    }
732
733    T(("creating stdscr"));
734    assert((sp->_lines_avail + sp->_topstolen + bottom_stolen) == slines);
735    if ((StdScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
736						  sp->_lines_avail,
737						  scolumns, 0, 0)) == 0) {
738	ReturnScreenError();
739    }
740    SET_LINES(sp->_lines_avail);
741#if !USE_REENTRANT
742    stdscr = StdScreen(sp);
743#endif
744    sp->_prescreen = FALSE;
745    returnCode(OK);
746}
747
748#if NCURSES_SP_FUNCS
749NCURSES_EXPORT(int)
750_nc_setupscreen(int slines GCC_UNUSED,
751		int scolumns GCC_UNUSED,
752		FILE *output,
753		int filtered,
754		int slk_format)
755{
756    SCREEN *sp = 0;
757    int rc = NCURSES_SP_NAME(_nc_setupscreen) (&sp,
758					       slines,
759					       scolumns,
760					       output,
761					       filtered,
762					       slk_format);
763    if (rc != OK)
764	_nc_set_screen(0);
765    return rc;
766}
767#endif
768
769/*
770 * The internal implementation interprets line as the number of lines to rip
771 * off from the top or bottom.
772 */
773NCURSES_EXPORT(int)
774NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_DCLx
775				 int line,
776				 int (*init) (WINDOW *, int))
777{
778    int code = ERR;
779    TR_FUNC_BFR(1);
780
781    START_TRACE();
782    T((T_CALLED("ripoffline(%p,%d,%s)"),
783       (void *) SP_PARM, line,
784       TR_FUNC_ARG(0, init)));
785
786#if NCURSES_SP_FUNCS
787    if (SP_PARM != 0 && SP_PARM->_prescreen)
788#endif
789    {
790	if (line == 0) {
791	    code = OK;
792	} else {
793	    if (safe_ripoff_sp == 0) {
794		safe_ripoff_sp = safe_ripoff_stack;
795	    }
796	    if (safe_ripoff_sp < safe_ripoff_stack + N_RIPS) {
797		safe_ripoff_sp->line = line;
798		safe_ripoff_sp->hook = init;
799		(safe_ripoff_sp)++;
800		T(("ripped-off %d:%d chunks",
801		   (int) (safe_ripoff_sp - safe_ripoff_stack), N_RIPS));
802		code = OK;
803	    }
804	}
805    }
806
807    returnCode(code);
808}
809
810#if NCURSES_SP_FUNCS
811NCURSES_EXPORT(int)
812_nc_ripoffline(int line, int (*init) (WINDOW *, int))
813{
814    int rc;
815    _nc_lock_global(prescreen);
816    START_TRACE();
817    rc = NCURSES_SP_NAME(_nc_ripoffline) (CURRENT_SCREEN_PRE, line, init);
818    _nc_unlock_global(prescreen);
819    return rc;
820}
821#endif
822
823NCURSES_EXPORT(int)
824NCURSES_SP_NAME(ripoffline) (NCURSES_SP_DCLx
825			     int line,
826			     int (*init) (WINDOW *, int))
827{
828    START_TRACE();
829    return NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_ARGx
830					    (line < 0) ? -1 : 1,
831					    init);
832}
833
834#if NCURSES_SP_FUNCS
835NCURSES_EXPORT(int)
836ripoffline(int line, int (*init) (WINDOW *, int))
837{
838    int rc;
839    _nc_lock_global(prescreen);
840    START_TRACE();
841    rc = NCURSES_SP_NAME(ripoffline) (CURRENT_SCREEN_PRE, line, init);
842    _nc_unlock_global(prescreen);
843    return rc;
844}
845#endif
846