1/* $OpenBSD: lib_set_term.c,v 1.15 2023/10/17 09:52:09 nicm Exp $ */
2
3/****************************************************************************
4 * Copyright 2018-2021,2022 Thomas E. Dickey                                *
5 * Copyright 1998-2016,2017 Free Software Foundation, Inc.                  *
6 *                                                                          *
7 * Permission is hereby granted, free of charge, to any person obtaining a  *
8 * copy of this software and associated documentation files (the            *
9 * "Software"), to deal in the Software without restriction, including      *
10 * without limitation the rights to use, copy, modify, merge, publish,      *
11 * distribute, distribute with modifications, sublicense, and/or sell       *
12 * copies of the Software, and to permit persons to whom the Software is    *
13 * furnished to do so, subject to the following conditions:                 *
14 *                                                                          *
15 * The above copyright notice and this permission notice shall be included  *
16 * in all copies or substantial portions of the Software.                   *
17 *                                                                          *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
25 *                                                                          *
26 * Except as contained in this notice, the name(s) of the above copyright   *
27 * holders shall not be used in advertising or otherwise to promote the     *
28 * sale, use or other dealings in this Software without prior written       *
29 * authorization.                                                           *
30 ****************************************************************************/
31
32/****************************************************************************
33 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
34 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
35 *     and: Thomas E. Dickey                        1996-on                 *
36 *     and: Juergen Pfeifer                         2009                    *
37 ****************************************************************************/
38
39/*
40**	lib_set_term.c
41**
42**	The routine set_term().
43**
44*/
45
46#define NEW_PAIR_INTERNAL 1
47
48#include <curses.priv.h>
49#include <tic.h>
50#include <new_pair.h>
51
52#if USE_GPM_SUPPORT
53#ifdef HAVE_LIBDL
54/* use dynamic loader to avoid linkage dependency */
55#include <dlfcn.h>
56#endif
57#endif
58
59#undef CUR
60#define CUR SP_TERMTYPE
61
62MODULE_ID("$Id: lib_set_term.c,v 1.15 2023/10/17 09:52:09 nicm Exp $")
63
64#ifdef USE_TERM_DRIVER
65#define MaxColors      InfoOf(sp).maxcolors
66#define NumLabels      InfoOf(sp).numlabels
67#else
68#define MaxColors      max_colors
69#define NumLabels      num_labels
70#endif
71
72NCURSES_EXPORT(SCREEN *)
73set_term(SCREEN *screenp)
74{
75    SCREEN *oldSP;
76    SCREEN *newSP;
77
78    T((T_CALLED("set_term(%p)"), (void *) screenp));
79
80    _nc_lock_global(curses);
81
82    oldSP = CURRENT_SCREEN;
83    _nc_set_screen(screenp);
84    newSP = screenp;
85
86    if (newSP != 0) {
87	TINFO_SET_CURTERM(newSP, newSP->_term);
88#if !USE_REENTRANT
89	curscr = CurScreen(newSP);
90	newscr = NewScreen(newSP);
91	stdscr = StdScreen(newSP);
92	COLORS = newSP->_color_count;
93	COLOR_PAIRS = newSP->_pair_count;
94#endif
95    } else {
96	TINFO_SET_CURTERM(oldSP, 0);
97#if !USE_REENTRANT
98	curscr = 0;
99	newscr = 0;
100	stdscr = 0;
101	COLORS = 0;
102	COLOR_PAIRS = 0;
103#endif
104    }
105
106    _nc_unlock_global(curses);
107
108    T((T_RETURN("%p"), (void *) oldSP));
109    return (oldSP);
110}
111
112static void
113_nc_free_keytry(TRIES * kt)
114{
115    if (kt != 0) {
116	_nc_free_keytry(kt->child);
117	_nc_free_keytry(kt->sibling);
118	free(kt);
119    }
120}
121
122static bool
123delink_screen(SCREEN *sp)
124{
125    SCREEN *last = 0;
126    SCREEN *temp;
127    bool result = FALSE;
128
129    for (each_screen(temp)) {
130	if (temp == sp) {
131	    if (last)
132		last->_next_screen = sp->_next_screen;
133	    else
134		_nc_screen_chain = sp->_next_screen;
135	    result = TRUE;
136	    break;
137	}
138	last = temp;
139    }
140    return result;
141}
142
143/*
144 * Free the storage associated with the given SCREEN sp.
145 */
146NCURSES_EXPORT(void)
147delscreen(SCREEN *sp)
148{
149
150    T((T_CALLED("delscreen(%p)"), (void *) sp));
151
152    _nc_lock_global(curses);
153    if (delink_screen(sp)) {
154	WINDOWLIST *wl;
155	bool is_current = (sp == CURRENT_SCREEN);
156
157#ifdef USE_SP_RIPOFF
158	if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
159	    ripoff_t *rop;
160	    for (rop = safe_ripoff_stack;
161		 rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
162		 rop++) {
163		if (rop->win) {
164		    (void) delwin(rop->win);
165		    rop->win = 0;
166		}
167	    }
168	}
169#endif
170
171	/* delete all of the windows in this screen */
172      rescan:
173	for (each_window(sp, wl)) {
174	    if (_nc_freewin(&(wl->win)) == OK) {
175		goto rescan;
176	    }
177	}
178
179	if (sp->_slk != 0) {
180
181	    if (sp->_slk->ent != 0) {
182		int i;
183
184		for (i = 0; i < sp->_slk->labcnt; ++i) {
185		    FreeIfNeeded(sp->_slk->ent[i].ent_text);
186		    FreeIfNeeded(sp->_slk->ent[i].form_text);
187		}
188		free(sp->_slk->ent);
189	    }
190	    free(sp->_slk);
191	    sp->_slk = 0;
192	}
193
194	_nc_free_keytry(sp->_keytry);
195	sp->_keytry = 0;
196
197	_nc_free_keytry(sp->_key_ok);
198	sp->_key_ok = 0;
199
200	FreeIfNeeded(sp->_current_attr);
201
202	_nc_free_ordered_pairs(sp);
203	FreeIfNeeded(sp->_color_table);
204	FreeIfNeeded(sp->_color_pairs);
205
206	FreeIfNeeded(sp->_oldnum_list);
207	FreeIfNeeded(sp->oldhash);
208	FreeIfNeeded(sp->newhash);
209	FreeIfNeeded(sp->hashtab);
210
211	FreeIfNeeded(sp->_acs_map);
212	FreeIfNeeded(sp->_screen_acs_map);
213
214	NCURSES_SP_NAME(_nc_flush) (NCURSES_SP_ARG);
215	NCURSES_SP_NAME(del_curterm) (NCURSES_SP_ARGx sp->_term);
216	FreeIfNeeded(sp->out_buffer);
217	if (_nc_find_prescr() == sp) {
218	    _nc_forget_prescr();
219	}
220#if USE_GPM_SUPPORT
221#ifdef HAVE_LIBDL
222	if (sp->_dlopen_gpm != 0) {
223	    dlclose(sp->_dlopen_gpm);
224	    sp->_dlopen_gpm = 0;
225	}
226#endif
227#endif /* USE_GPM_SUPPORT */
228	free(sp);
229
230	/*
231	 * If this was the current screen, reset everything that the
232	 * application might try to use (except cur_term, which may have
233	 * multiple references in different screens).
234	 */
235	if (is_current) {
236#if !USE_REENTRANT
237	    curscr = 0;
238	    newscr = 0;
239	    stdscr = 0;
240	    COLORS = 0;
241	    COLOR_PAIRS = 0;
242#endif
243	    _nc_set_screen(0);
244#if USE_WIDEC_SUPPORT
245	    if (SP == 0) {
246		FreeIfNeeded(_nc_wacs);
247		_nc_wacs = 0;
248	    }
249#endif
250	} else {
251	    set_term(CURRENT_SCREEN);
252	}
253    }
254    _nc_unlock_global(curses);
255
256    returnVoid;
257}
258
259static bool
260no_mouse_event(SCREEN *sp GCC_UNUSED)
261{
262    return FALSE;
263}
264
265static bool
266no_mouse_inline(SCREEN *sp GCC_UNUSED)
267{
268    return FALSE;
269}
270
271static bool
272no_mouse_parse(SCREEN *sp GCC_UNUSED, int code GCC_UNUSED)
273{
274    return TRUE;
275}
276
277static void
278no_mouse_resume(SCREEN *sp GCC_UNUSED)
279{
280}
281
282static void
283no_mouse_wrap(SCREEN *sp GCC_UNUSED)
284{
285}
286
287#if NCURSES_EXT_FUNCS && USE_COLORFGBG
288static const char *
289extract_fgbg(const char *src, int *result)
290{
291    const char *dst = 0;
292    char *tmp = 0;
293    long value = strtol(src, &tmp, 0);
294
295    if ((dst = tmp) == 0) {
296	dst = src;
297    } else if (value >= 0) {
298	*result = (int) value;
299    }
300    while (*dst != 0 && *dst != ';')
301	dst++;
302    if (*dst == ';')
303	dst++;
304    return dst;
305}
306#endif
307
308#define ReturnScreenError() do { _nc_set_screen(0); \
309                            returnCode(ERR); } while (0)
310
311/* OS-independent screen initializations */
312NCURSES_EXPORT(int)
313NCURSES_SP_NAME(_nc_setupscreen) (
314#if NCURSES_SP_FUNCS
315				     SCREEN **spp,
316#endif
317				     int slines,
318				     int scolumns,
319				     FILE *output,
320				     int filtered,
321				     int slk_format)
322{
323#ifndef USE_TERM_DRIVER
324    static const TTY null_TTY;	/* all zeros iff uninitialized */
325#endif
326    char *env;
327    int bottom_stolen = 0;
328    SCREEN *sp;
329#ifndef USE_TERM_DRIVER
330    bool support_cookies = USE_XMC_SUPPORT;
331#endif
332
333    T((T_CALLED("_nc_setupscreen(%d, %d, %p, %d, %d)"),
334       slines, scolumns, (void *) output, filtered, slk_format));
335
336    assert(CURRENT_SCREEN == 0);	/* has been reset in newterm() ! */
337
338#if NCURSES_SP_FUNCS
339    assert(spp != 0);
340    sp = *spp;
341
342    if (!sp) {
343	sp = _nc_alloc_screen_sp();
344	T(("_nc_alloc_screen_sp %p", (void *) sp));
345	*spp = sp;
346    }
347    if (sp == NULL) {
348	ReturnScreenError();
349    }
350    if ((sp->_acs_map = typeCalloc(chtype, ACS_LEN)) == NULL) {
351	ReturnScreenError();
352    }
353    if ((sp->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == NULL) {
354	free(sp->_acs_map);
355	ReturnScreenError();
356    }
357
358    T(("created SP %p", (void *) sp));
359    sp->_next_screen = _nc_screen_chain;
360    _nc_screen_chain = sp;
361
362    if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0) {
363	ReturnScreenError();
364    }
365#else
366    if (!_nc_alloc_screen()
367	|| ((SP->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
368	|| ((SP->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
369	returnCode(ERR);
370    }
371
372    T(("created SP %p", (void *) SP));
373
374    sp = SP;			/* fixup so SET_LINES and SET_COLS works */
375    sp->_next_screen = _nc_screen_chain;
376    _nc_screen_chain = sp;
377
378    if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0) {
379	returnCode(ERR);
380    }
381#endif
382
383    /*
384     * We should always check the screensize, just in case.
385     */
386    _nc_set_screen(sp);
387    sp->_term = cur_term;
388#ifdef USE_TERM_DRIVER
389    TCBOf(sp)->csp = sp;
390    _nc_get_screensize(sp, sp->_term, &slines, &scolumns);
391#else
392    _nc_get_screensize(sp, &slines, &scolumns);
393#endif
394    SET_LINES(slines);
395    SET_COLS(scolumns);
396
397    T((T_CREATE("screen %s %dx%d"),
398       NCURSES_SP_NAME(termname) (NCURSES_SP_ARG), slines, scolumns));
399
400    sp->_filtered = filtered;
401
402    /* implement filter mode */
403    if (filtered) {
404	slines = 1;
405	SET_LINES(slines);
406#ifdef USE_TERM_DRIVER
407	CallDriver(sp, td_setfilter);
408#else
409	/* *INDENT-EQLS* */
410	clear_screen     = ABSENT_STRING;
411	cursor_address   = ABSENT_STRING;
412	cursor_down      = ABSENT_STRING;
413	cursor_up        = ABSENT_STRING;
414	parm_down_cursor = ABSENT_STRING;
415	parm_up_cursor   = ABSENT_STRING;
416	row_address      = ABSENT_STRING;
417	cursor_home      = carriage_return;
418
419	if (back_color_erase)
420	    clr_eos = ABSENT_STRING;
421
422#endif
423	T(("filter screensize %dx%d", slines, scolumns));
424    }
425#ifdef __DJGPP__
426    T(("setting output mode to binary"));
427    fflush(output);
428    setmode(output, O_BINARY);
429#endif
430#if defined(EXP_WIN32_DRIVER)
431    T(("setting output mode to binary"));
432    fflush(output);
433    _setmode(fileno(output), _O_BINARY);
434#endif
435    sp->_lines = (NCURSES_SIZE_T) slines;
436    sp->_lines_avail = (NCURSES_SIZE_T) slines;
437    sp->_columns = (NCURSES_SIZE_T) scolumns;
438
439    fflush(output);
440    sp->_ofd = output ? fileno(output) : -1;
441    sp->_ofp = output;
442#if defined(EXP_WIN32_DRIVER)
443    if (output)
444	_setmode(fileno(output), _O_BINARY);
445#endif
446    sp->out_limit = (size_t) ((2 + slines) * (6 + scolumns));
447    if ((sp->out_buffer = malloc(sp->out_limit)) == 0)
448	sp->out_limit = 0;
449    sp->out_inuse = 0;
450
451    SP_PRE_INIT(sp);
452    SetNoPadding(sp);
453
454#if NCURSES_EXT_FUNCS
455    sp->_default_color = FALSE;
456    sp->_has_sgr_39_49 = FALSE;
457
458    /*
459     * Set our assumption of the terminal's default foreground and background
460     * colors.  The curs_color man-page states that we can assume that the
461     * background is black.  The origin of this assumption appears to be
462     * terminals that displayed colored text, but no colored backgrounds, e.g.,
463     * the first colored terminals around 1980.  More recent ones with better
464     * technology can display not only colored backgrounds, but all
465     * combinations.  So a terminal might be something other than "white" on
466     * black (green/black looks monochrome too), but black on white or even
467     * on ivory.
468     *
469     * White-on-black is the simplest thing to use for monochrome.  Almost
470     * all applications that use color paint both text and background, so
471     * the distinction is moot.  But a few do not - which is why we leave this
472     * configurable (a better solution is to use assume_default_colors() for
473     * the rare applications that do require that sort of appearance, since
474     * is appears that more users expect to be able to make a white-on-black
475     * or black-on-white display under control of the application than not).
476     */
477#ifdef USE_ASSUMED_COLOR
478    sp->_default_fg = COLOR_WHITE;
479    sp->_default_bg = COLOR_BLACK;
480#else
481    sp->_default_fg = COLOR_DEFAULT;
482    sp->_default_bg = COLOR_DEFAULT;
483#endif
484
485    /*
486     * Allow those assumed/default color assumptions to be overridden at
487     * runtime:
488     */
489    if ((env = getenv("NCURSES_ASSUMED_COLORS")) != 0) {
490	int fg, bg;
491	char sep1, sep2;
492	int count = sscanf(env, "%d%c%d%c", &fg, &sep1, &bg, &sep2);
493	if (count >= 1) {
494	    sp->_default_fg = ((fg >= 0 && fg < MaxColors) ? fg : COLOR_DEFAULT);
495	    if (count >= 3) {
496		sp->_default_bg = ((bg >= 0 && bg < MaxColors) ? bg : COLOR_DEFAULT);
497	    }
498	    TR(TRACE_CHARPUT | TRACE_MOVE,
499	       ("from environment assumed fg=%d, bg=%d",
500		sp->_default_fg,
501		sp->_default_bg));
502	}
503    }
504#if USE_COLORFGBG
505    /*
506     * If rxvt's $COLORFGBG variable is set, use it to specify the assumed
507     * default colors.  Note that rxvt (mis)uses bold colors, equating a bold
508     * color to that value plus 8.  We'll only use the non-bold color for now -
509     * decide later if it is worth having default attributes as well.
510     */
511    if (getenv("COLORFGBG") != 0) {
512	const char *p = getenv("COLORFGBG");
513	TR(TRACE_CHARPUT | TRACE_MOVE, ("decoding COLORFGBG %s", p));
514	p = extract_fgbg(p, &(sp->_default_fg));
515	p = extract_fgbg(p, &(sp->_default_bg));
516	if (*p)			/* assume rxvt was compiled with xpm support */
517	    extract_fgbg(p, &(sp->_default_bg));
518	TR(TRACE_CHARPUT | TRACE_MOVE, ("decoded fg=%d, bg=%d",
519					sp->_default_fg, sp->_default_bg));
520	if (sp->_default_fg >= MaxColors) {
521	    if (set_a_foreground != ABSENT_STRING
522		&& !strcmp(set_a_foreground, "\033[3%p1%dm")) {
523		set_a_foreground = strdup("\033[3%?%p1%{8}%>%t9%e%p1%d%;m");
524	    } else {
525		sp->_default_fg %= MaxColors;
526	    }
527	}
528	if (sp->_default_bg >= MaxColors) {
529	    if (set_a_background != ABSENT_STRING
530		&& !strcmp(set_a_background, "\033[4%p1%dm")) {
531		set_a_background = strdup("\033[4%?%p1%{8}%>%t9%e%p1%d%;m");
532	    } else {
533		sp->_default_bg %= MaxColors;
534	    }
535	}
536    }
537#endif
538#endif /* NCURSES_EXT_FUNCS */
539
540    sp->_maxclick = DEFAULT_MAXCLICK;
541    sp->_mouse_event = no_mouse_event;
542    sp->_mouse_inline = no_mouse_inline;
543    sp->_mouse_parse = no_mouse_parse;
544    sp->_mouse_resume = no_mouse_resume;
545    sp->_mouse_wrap = no_mouse_wrap;
546    sp->_mouse_fd = -1;
547
548    /*
549     * If we've no magic cookie support, we suppress attributes that xmc would
550     * affect, i.e., the attributes that affect the rendition of a space.
551     */
552    sp->_ok_attributes = NCURSES_SP_NAME(termattrs) (NCURSES_SP_ARG);
553    if (NCURSES_SP_NAME(has_colors) (NCURSES_SP_ARG)) {
554	sp->_ok_attributes |= A_COLOR;
555    }
556#ifdef USE_TERM_DRIVER
557    _nc_cookie_init(sp);
558#else
559#if USE_XMC_SUPPORT
560    /*
561     * If we have no magic-cookie support compiled-in, or if it is suppressed
562     * in the environment, reset the support-flag.
563     */
564    if (magic_cookie_glitch >= 0) {
565	if (getenv("NCURSES_NO_MAGIC_COOKIE") != 0) {
566	    support_cookies = FALSE;
567	}
568    }
569#endif
570
571    if (!support_cookies && magic_cookie_glitch >= 0) {
572	T(("will disable attributes to work w/o magic cookies"));
573    }
574
575    if (magic_cookie_glitch > 0) {	/* tvi, wyse */
576
577	sp->_xmc_triggers = sp->_ok_attributes & XMC_CONFLICT;
578#if 0
579	/*
580	 * We "should" treat colors as an attribute.  The wyse350 (and its
581	 * clones) appear to be the only ones that have both colors and magic
582	 * cookies.
583	 */
584	if (has_colors()) {
585	    sp->_xmc_triggers |= A_COLOR;
586	}
587#endif
588	sp->_xmc_suppress = sp->_xmc_triggers & (chtype) ~(A_BOLD);
589
590	T(("magic cookie attributes %s", _traceattr(sp->_xmc_suppress)));
591	/*
592	 * Supporting line-drawing may be possible.  But make the regular
593	 * video attributes work first.
594	 */
595	acs_chars = ABSENT_STRING;
596	ena_acs = ABSENT_STRING;
597	enter_alt_charset_mode = ABSENT_STRING;
598	exit_alt_charset_mode = ABSENT_STRING;
599#if USE_XMC_SUPPORT
600	/*
601	 * To keep the cookie support simple, suppress all of the optimization
602	 * hooks except for clear_screen and the cursor addressing.
603	 */
604	if (support_cookies) {
605	    clr_eol = ABSENT_STRING;
606	    clr_eos = ABSENT_STRING;
607	    set_attributes = ABSENT_STRING;
608	}
609#endif
610    } else if (magic_cookie_glitch == 0) {	/* hpterm */
611    }
612
613    /*
614     * If magic cookies are not supported, cancel the strings that set
615     * video attributes.
616     */
617    if (!support_cookies && magic_cookie_glitch >= 0) {
618	magic_cookie_glitch = ABSENT_NUMERIC;
619	set_attributes = ABSENT_STRING;
620	enter_blink_mode = ABSENT_STRING;
621	enter_bold_mode = ABSENT_STRING;
622	enter_dim_mode = ABSENT_STRING;
623	enter_reverse_mode = ABSENT_STRING;
624	enter_standout_mode = ABSENT_STRING;
625	enter_underline_mode = ABSENT_STRING;
626    }
627
628    /* initialize normal acs before wide, since we use mapping in the latter */
629#if !USE_WIDEC_SUPPORT
630    if (_nc_unicode_locale() && _nc_locale_breaks_acs(sp->_term)) {
631	acs_chars = NULL;
632	ena_acs = NULL;
633	enter_alt_charset_mode = NULL;
634	exit_alt_charset_mode = NULL;
635	set_attributes = NULL;
636    }
637#endif
638#endif
639
640    NCURSES_SP_NAME(_nc_init_acs) (NCURSES_SP_ARG);
641#if USE_WIDEC_SUPPORT
642    sp->_screen_unicode = _nc_unicode_locale();
643    if (_nc_wacs == 0) {
644	_nc_init_wacs();
645    }
646    if (_nc_wacs == 0) {
647	ReturnScreenError();
648    }
649
650    sp->_screen_acs_fix = (sp->_screen_unicode
651			   && _nc_locale_breaks_acs(sp->_term));
652#endif
653    env = _nc_get_locale();
654    sp->_legacy_coding = ((env == 0)
655			  || !strcmp(env, "C")
656			  || !strcmp(env, "POSIX"));
657    T(("legacy-coding %d", sp->_legacy_coding));
658
659    sp->_nc_sp_idcok = TRUE;
660    sp->_nc_sp_idlok = FALSE;
661
662    sp->oldhash = 0;
663    sp->newhash = 0;
664
665    T(("creating newscr"));
666    NewScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
667					     0, 0);
668    if (NewScreen(sp) == 0) {
669	ReturnScreenError();
670    }
671    T(("creating curscr"));
672    CurScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
673					     0, 0);
674    if (CurScreen(sp) == 0) {
675	ReturnScreenError();
676    }
677#if !USE_REENTRANT
678    newscr = NewScreen(sp);
679    curscr = CurScreen(sp);
680#endif
681#if USE_SIZECHANGE
682    sp->_resize = NCURSES_SP_NAME(resizeterm);
683    sp->_ungetch = safe_ungetch;
684#endif
685
686    NewScreen(sp)->_clear = TRUE;
687    CurScreen(sp)->_clear = FALSE;
688
689    /*
690     * Get the current tty-modes. setupterm() may already have done this,
691     * unless we use the term-driver.
692     */
693#ifndef USE_TERM_DRIVER
694    if (cur_term != 0 &&
695	!memcmp(&cur_term->Ottyb, &null_TTY, sizeof(TTY)))
696#endif
697    {
698	NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
699	NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
700    }
701
702    if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
703	ripoff_t *rop;
704
705	for (rop = safe_ripoff_stack;
706	     rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
707	     rop++) {
708
709	    /* If we must simulate soft labels, grab off the line to be used.
710	       We assume that we must simulate, if it is none of the standard
711	       formats (4-4 or 3-2-3) for which there may be some hardware
712	       support. */
713	    if (rop->hook == _nc_slk_initialize) {
714		if (!TerminalOf(sp)) {
715		    continue;
716		}
717		if (!(NumLabels <= 0 || !SLK_STDFMT(slk_format))) {
718		    continue;
719		}
720	    }
721	    if (rop->hook) {
722		int count;
723		WINDOW *w;
724
725		count = (rop->line < 0) ? -rop->line : rop->line;
726		T(("ripping off %i lines at %s", count,
727		   ((rop->line < 0)
728		    ? "bottom"
729		    : "top")));
730
731		w = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
732					     count, scolumns,
733					     ((rop->line < 0)
734					      ? sp->_lines_avail - count
735					      : 0),
736					     0);
737		if (w) {
738		    rop->win = w;
739		    rop->hook(w, scolumns);
740		} else {
741		    ReturnScreenError();
742		}
743		if (rop->line < 0) {
744		    bottom_stolen += count;
745		} else {
746		    sp->_topstolen = (NCURSES_SIZE_T) (sp->_topstolen + count);
747		}
748		sp->_lines_avail = (NCURSES_SIZE_T) (sp->_lines_avail - count);
749	    }
750	}
751	/* reset the stack */
752	safe_ripoff_sp = safe_ripoff_stack;
753    }
754
755    T(("creating stdscr"));
756    (void) bottom_stolen;
757    assert((sp->_lines_avail + sp->_topstolen + bottom_stolen) == slines);
758    if ((StdScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
759						  sp->_lines_avail,
760						  scolumns, 0, 0)) == 0) {
761	ReturnScreenError();
762    }
763    SET_LINES(sp->_lines_avail);
764#if !USE_REENTRANT
765    stdscr = StdScreen(sp);
766#endif
767    sp->_prescreen = FALSE;
768    returnCode(OK);
769}
770
771#if NCURSES_SP_FUNCS
772NCURSES_EXPORT(int)
773_nc_setupscreen(int slines GCC_UNUSED,
774		int scolumns GCC_UNUSED,
775		FILE *output,
776		int filtered,
777		int slk_format)
778{
779    SCREEN *sp = 0;
780    int rc = NCURSES_SP_NAME(_nc_setupscreen) (&sp,
781					       slines,
782					       scolumns,
783					       output,
784					       filtered,
785					       slk_format);
786    if (rc != OK)
787	_nc_set_screen(0);
788    return rc;
789}
790#endif
791
792/*
793 * The internal implementation interprets line as the number of lines to rip
794 * off from the top or bottom.
795 */
796NCURSES_EXPORT(int)
797NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_DCLx
798				 int line,
799				 int (*init) (WINDOW *, int))
800{
801    int code = ERR;
802    TR_FUNC_BFR(1);
803
804    START_TRACE();
805    T((T_CALLED("ripoffline(%p,%d,%s)"),
806       (void *) SP_PARM, line,
807       TR_FUNC_ARG(0, init)));
808
809#if NCURSES_SP_FUNCS
810    if (SP_PARM != 0 && SP_PARM->_prescreen)
811#endif
812    {
813	if (line == 0) {
814	    code = OK;
815	} else {
816	    if (safe_ripoff_sp == 0) {
817		safe_ripoff_sp = safe_ripoff_stack;
818	    }
819	    if (safe_ripoff_sp < safe_ripoff_stack + N_RIPS) {
820		safe_ripoff_sp->line = line;
821		safe_ripoff_sp->hook = init;
822		(safe_ripoff_sp)++;
823		T(("ripped-off %d:%d chunks",
824		   (int) (safe_ripoff_sp - safe_ripoff_stack), N_RIPS));
825		code = OK;
826	    }
827	}
828    }
829
830    returnCode(code);
831}
832
833#if NCURSES_SP_FUNCS
834NCURSES_EXPORT(int)
835_nc_ripoffline(int line, int (*init) (WINDOW *, int))
836{
837    int rc;
838
839    _nc_init_pthreads();
840    _nc_lock_global(prescreen);
841    START_TRACE();
842    rc = NCURSES_SP_NAME(_nc_ripoffline) (CURRENT_SCREEN_PRE, line, init);
843    _nc_unlock_global(prescreen);
844
845    return rc;
846}
847#endif
848
849NCURSES_EXPORT(int)
850NCURSES_SP_NAME(ripoffline) (NCURSES_SP_DCLx
851			     int line,
852			     int (*init) (WINDOW *, int))
853{
854    START_TRACE();
855    return NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_ARGx
856					    (line < 0) ? -1 : 1,
857					    init);
858}
859
860#if NCURSES_SP_FUNCS
861NCURSES_EXPORT(int)
862ripoffline(int line, int (*init) (WINDOW *, int))
863{
864    int rc;
865
866    _nc_init_pthreads();
867    _nc_lock_global(prescreen);
868    START_TRACE();
869    rc = NCURSES_SP_NAME(ripoffline) (CURRENT_SCREEN_PRE, line, init);
870    _nc_unlock_global(prescreen);
871
872    return rc;
873}
874#endif
875