1 /****************************************************************************
2 * Copyright 2018-2019,2020 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 * Terminal setup routines common to termcap and terminfo:
39 *
40 * use_env(bool)
41 * use_tioctl(bool)
42 * setupterm(char *, int, int *)
43 */
44
45 #include <curses.priv.h>
46 #include <tic.h> /* for MAX_NAME_SIZE */
47
48 #if HAVE_LOCALE_H
49 #include <locale.h>
50 #endif
51
52 MODULE_ID("$Id: lib_setup.c,v 1.207 2020/02/02 23:34:34 tom Exp $")
53
54 /****************************************************************************
55 *
56 * Terminal size computation
57 *
58 ****************************************************************************/
59
60 #if HAVE_SIZECHANGE
61 # if !defined(sun) || !TERMIOS
62 # if HAVE_SYS_IOCTL_H
63 # include <sys/ioctl.h>
64 # endif
65 # endif
66 #endif
67
68 #if NEED_PTEM_H
69 /* On SCO, they neglected to define struct winsize in termios.h -- it's only
70 * in termio.h and ptem.h (the former conflicts with other definitions).
71 */
72 # include <sys/stream.h>
73 # include <sys/ptem.h>
74 #endif
75
76 #if HAVE_LANGINFO_CODESET
77 #include <langinfo.h>
78 #endif
79
80 /*
81 * SCO defines TIOCGSIZE and the corresponding struct. Other systems (SunOS,
82 * Solaris, IRIX) define TIOCGWINSZ and struct winsize.
83 */
84 #ifdef TIOCGSIZE
85 # define IOCTL_WINSIZE TIOCGSIZE
86 # define STRUCT_WINSIZE struct ttysize
87 # define WINSIZE_ROWS(n) (int)n.ts_lines
88 # define WINSIZE_COLS(n) (int)n.ts_cols
89 #else
90 # ifdef TIOCGWINSZ
91 # define IOCTL_WINSIZE TIOCGWINSZ
92 # define STRUCT_WINSIZE struct winsize
93 # define WINSIZE_ROWS(n) (int)n.ws_row
94 # define WINSIZE_COLS(n) (int)n.ws_col
95 # endif
96 #endif
97
98 /*
99 * Reduce explicit use of "cur_term" global variable.
100 */
101 #undef CUR
102 #define CUR TerminalType(termp).
103
104 /*
105 * Wrap global variables in this module.
106 */
107 #if USE_REENTRANT
108
NCURSES_EXPORT(char *)109 NCURSES_EXPORT(char *)
110 NCURSES_PUBLIC_VAR(ttytype) (void)
111 {
112 static char empty[] = "";
113 char *result = empty;
114
115 #if NCURSES_SP_FUNCS
116 if (CURRENT_SCREEN) {
117 TERMINAL *termp = TerminalOf(CURRENT_SCREEN);
118 if (termp != 0) {
119 result = TerminalType(termp).term_names;
120 }
121 }
122 #else
123 if (cur_term != 0) {
124 result = TerminalType(cur_term).term_names;
125 }
126 #endif
127 return result;
128 }
129
130 NCURSES_EXPORT(int *)
_nc_ptr_Lines(SCREEN * sp)131 _nc_ptr_Lines(SCREEN *sp)
132 {
133 return ptrLines(sp);
134 }
135
136 NCURSES_EXPORT(int)
NCURSES_PUBLIC_VAR(LINES)137 NCURSES_PUBLIC_VAR(LINES) (void)
138 {
139 return *_nc_ptr_Lines(CURRENT_SCREEN);
140 }
141
142 NCURSES_EXPORT(int *)
_nc_ptr_Cols(SCREEN * sp)143 _nc_ptr_Cols(SCREEN *sp)
144 {
145 return ptrCols(sp);
146 }
147
148 NCURSES_EXPORT(int)
NCURSES_PUBLIC_VAR(COLS)149 NCURSES_PUBLIC_VAR(COLS) (void)
150 {
151 return *_nc_ptr_Cols(CURRENT_SCREEN);
152 }
153
154 NCURSES_EXPORT(int *)
_nc_ptr_Tabsize(SCREEN * sp)155 _nc_ptr_Tabsize(SCREEN *sp)
156 {
157 return ptrTabsize(sp);
158 }
159
160 NCURSES_EXPORT(int)
NCURSES_PUBLIC_VAR(TABSIZE)161 NCURSES_PUBLIC_VAR(TABSIZE) (void)
162 {
163 return *_nc_ptr_Tabsize(CURRENT_SCREEN);
164 }
165 #else
166 NCURSES_EXPORT_VAR(char) ttytype[NAMESIZE] = "";
167 NCURSES_EXPORT_VAR(int) LINES = 0;
168 NCURSES_EXPORT_VAR(int) COLS = 0;
169 NCURSES_EXPORT_VAR(int) TABSIZE = 8;
170 #endif
171
172 #if NCURSES_EXT_FUNCS
173 NCURSES_EXPORT(int)
NCURSES_SP_NAME(set_tabsize)174 NCURSES_SP_NAME(set_tabsize) (NCURSES_SP_DCLx int value)
175 {
176 int code = OK;
177 if (value <= 0) {
178 code = ERR;
179 } else {
180 #if USE_REENTRANT
181 if (SP_PARM) {
182 SP_PARM->_TABSIZE = value;
183 } else {
184 code = ERR;
185 }
186 #else
187 (void) SP_PARM;
188 TABSIZE = value;
189 #endif
190 }
191 return code;
192 }
193
194 #if NCURSES_SP_FUNCS
195 NCURSES_EXPORT(int)
set_tabsize(int value)196 set_tabsize(int value)
197 {
198 return NCURSES_SP_NAME(set_tabsize) (CURRENT_SCREEN, value);
199 }
200 #endif
201 #endif /* NCURSES_EXT_FUNCS */
202
203 #if USE_SIGWINCH
204 /*
205 * If we have a pending SIGWINCH, set the flag in each screen.
206 */
207 NCURSES_EXPORT(int)
_nc_handle_sigwinch(SCREEN * sp)208 _nc_handle_sigwinch(SCREEN *sp)
209 {
210 SCREEN *scan;
211
212 if (_nc_globals.have_sigwinch) {
213 _nc_globals.have_sigwinch = 0;
214
215 for (each_screen(scan)) {
216 scan->_sig_winch = TRUE;
217 }
218 }
219
220 return (sp ? sp->_sig_winch : 0);
221 }
222
223 #endif
224
225 NCURSES_EXPORT(void)
NCURSES_SP_NAME(use_env)226 NCURSES_SP_NAME(use_env) (NCURSES_SP_DCLx bool f)
227 {
228 START_TRACE();
229 T((T_CALLED("use_env(%p,%d)"), (void *) SP_PARM, (int) f));
230 #if NCURSES_SP_FUNCS
231 if (IsPreScreen(SP_PARM)) {
232 SP_PARM->_use_env = f;
233 }
234 #else
235 _nc_prescreen.use_env = f;
236 #endif
237 returnVoid;
238 }
239
240 NCURSES_EXPORT(void)
NCURSES_SP_NAME(use_tioctl)241 NCURSES_SP_NAME(use_tioctl) (NCURSES_SP_DCLx bool f)
242 {
243 START_TRACE();
244 T((T_CALLED("use_tioctl(%p,%d)"), (void *) SP_PARM, (int) f));
245 #if NCURSES_SP_FUNCS
246 if (IsPreScreen(SP_PARM)) {
247 SP_PARM->use_tioctl = f;
248 }
249 #else
250 _nc_prescreen.use_tioctl = f;
251 #endif
252 returnVoid;
253 }
254
255 #if NCURSES_SP_FUNCS
256 NCURSES_EXPORT(void)
use_env(bool f)257 use_env(bool f)
258 {
259 START_TRACE();
260 T((T_CALLED("use_env(%d)"), (int) f));
261 _nc_prescreen.use_env = f;
262 returnVoid;
263 }
264
265 NCURSES_EXPORT(void)
use_tioctl(bool f)266 use_tioctl(bool f)
267 {
268 START_TRACE();
269 T((T_CALLED("use_tioctl(%d)"), (int) f));
270 _nc_prescreen.use_tioctl = f;
271 returnVoid;
272 }
273 #endif
274
275 NCURSES_EXPORT(void)
_nc_get_screensize(SCREEN * sp,TERMINAL * termp,int * linep,int * colp)276 _nc_get_screensize(SCREEN *sp,
277 #ifdef USE_TERM_DRIVER
278 TERMINAL *termp,
279 #endif
280 int *linep, int *colp)
281 /* Obtain lines/columns values from the environment and/or terminfo entry */
282 {
283 #ifdef USE_TERM_DRIVER
284 TERMINAL_CONTROL_BLOCK *TCB;
285 int my_tabsize;
286
287 assert(termp != 0 && linep != 0 && colp != 0);
288 TCB = (TERMINAL_CONTROL_BLOCK *) termp;
289
290 my_tabsize = TCB->info.tabsize;
291 TCB->drv->td_size(TCB, linep, colp);
292
293 #if USE_REENTRANT
294 if (sp != 0) {
295 sp->_TABSIZE = my_tabsize;
296 }
297 #else
298 (void) sp;
299 TABSIZE = my_tabsize;
300 #endif
301 T(("TABSIZE = %d", my_tabsize));
302 #else /* !USE_TERM_DRIVER */
303 TERMINAL *termp = cur_term;
304 int my_tabsize;
305 bool useEnv = _nc_prescreen.use_env;
306 bool useTioctl = _nc_prescreen.use_tioctl;
307
308 /* figure out the size of the screen */
309 T(("screen size: terminfo lines = %d columns = %d", lines, columns));
310
311 *linep = (int) lines;
312 *colp = (int) columns;
313
314 #if NCURSES_SP_FUNCS
315 if (sp) {
316 useEnv = sp->_use_env;
317 useTioctl = sp->use_tioctl;
318 }
319 #endif
320
321 if (useEnv || useTioctl) {
322 #ifdef __EMX__
323 {
324 int screendata[2];
325 _scrsize(screendata);
326 *colp = screendata[0];
327 *linep = ((sp != 0 && sp->_filtered)
328 ? 1
329 : screendata[1]);
330 T(("EMX screen size: environment LINES = %d COLUMNS = %d",
331 *linep, *colp));
332 }
333 #endif
334 #if HAVE_SIZECHANGE
335 /* try asking the OS */
336 if (NC_ISATTY(cur_term->Filedes)) {
337 STRUCT_WINSIZE size;
338
339 errno = 0;
340 do {
341 if (ioctl(cur_term->Filedes, IOCTL_WINSIZE, &size) >= 0) {
342 *linep = ((sp != 0 && sp->_filtered)
343 ? 1
344 : WINSIZE_ROWS(size));
345 *colp = WINSIZE_COLS(size);
346 T(("SYS screen size: environment LINES = %d COLUMNS = %d",
347 *linep, *colp));
348 break;
349 }
350 } while
351 (errno == EINTR);
352 }
353 #endif /* HAVE_SIZECHANGE */
354
355 if (useEnv) {
356 int value;
357
358 if (useTioctl) {
359 /*
360 * If environment variables are used, update them.
361 */
362 if ((sp == 0 || !sp->_filtered) && _nc_getenv_num("LINES") > 0) {
363 _nc_setenv_num("LINES", *linep);
364 }
365 if (_nc_getenv_num("COLUMNS") > 0) {
366 _nc_setenv_num("COLUMNS", *colp);
367 }
368 }
369
370 /*
371 * Finally, look for environment variables.
372 *
373 * Solaris lets users override either dimension with an environment
374 * variable.
375 */
376 if ((value = _nc_getenv_num("LINES")) > 0) {
377 *linep = value;
378 T(("screen size: environment LINES = %d", *linep));
379 }
380 if ((value = _nc_getenv_num("COLUMNS")) > 0) {
381 *colp = value;
382 T(("screen size: environment COLUMNS = %d", *colp));
383 }
384 }
385
386 /* if we can't get dynamic info about the size, use static */
387 if (*linep <= 0) {
388 *linep = (int) lines;
389 }
390 if (*colp <= 0) {
391 *colp = (int) columns;
392 }
393
394 /* the ultimate fallback, assume fixed 24x80 size */
395 if (*linep <= 0) {
396 *linep = 24;
397 }
398 if (*colp <= 0) {
399 *colp = 80;
400 }
401
402 /*
403 * Put the derived values back in the screen-size caps, so
404 * tigetnum() and tgetnum() will do the right thing.
405 */
406 lines = (NCURSES_INT2) (*linep);
407 columns = (NCURSES_INT2) (*colp);
408 #if NCURSES_EXT_NUMBERS
409 #define OldNumber(termp,name) \
410 (termp)->type.Numbers[(&name - (termp)->type2.Numbers)]
411 OldNumber(termp, lines) = (short) (*linep);
412 OldNumber(termp, columns) = (short) (*colp);
413 #endif
414 }
415
416 T(("screen size is %dx%d", *linep, *colp));
417
418 if (VALID_NUMERIC(init_tabs))
419 my_tabsize = (int) init_tabs;
420 else
421 my_tabsize = 8;
422
423 #if USE_REENTRANT
424 if (sp != 0)
425 sp->_TABSIZE = my_tabsize;
426 #else
427 TABSIZE = my_tabsize;
428 #endif
429 T(("TABSIZE = %d", TABSIZE));
430 #endif /* USE_TERM_DRIVER */
431 }
432
433 #if USE_SIZECHANGE
434 NCURSES_EXPORT(void)
_nc_update_screensize(SCREEN * sp)435 _nc_update_screensize(SCREEN *sp)
436 {
437 int new_lines;
438 int new_cols;
439
440 #ifdef USE_TERM_DRIVER
441 int old_lines;
442 int old_cols;
443
444 assert(sp != 0);
445
446 CallDriver_2(sp, td_getsize, &old_lines, &old_cols);
447
448 #else
449 TERMINAL *termp = cur_term;
450 int old_lines = lines;
451 int old_cols = columns;
452 #endif
453
454 if (sp != 0) {
455 TINFO_GET_SIZE(sp, sp->_term, &new_lines, &new_cols);
456 /*
457 * See is_term_resized() and resizeterm().
458 * We're doing it this way because those functions belong to the upper
459 * ncurses library, while this resides in the lower terminfo library.
460 */
461 if (sp->_resize != 0) {
462 if ((new_lines != old_lines) || (new_cols != old_cols)) {
463 sp->_resize(NCURSES_SP_ARGx new_lines, new_cols);
464 } else if (sp->_sig_winch && (sp->_ungetch != 0)) {
465 sp->_ungetch(SP_PARM, KEY_RESIZE); /* so application can know this */
466 }
467 sp->_sig_winch = FALSE;
468 }
469 }
470 }
471 #endif /* USE_SIZECHANGE */
472
473 /****************************************************************************
474 *
475 * Terminal setup
476 *
477 ****************************************************************************/
478
479 #if NCURSES_USE_DATABASE || NCURSES_USE_TERMCAP
480 /*
481 * Return 1 if entry found, 0 if not found, -1 if database not accessible,
482 * just like tgetent().
483 */
484 int
_nc_setup_tinfo(const char * const tn,TERMTYPE2 * const tp)485 _nc_setup_tinfo(const char *const tn, TERMTYPE2 *const tp)
486 {
487 char filename[PATH_MAX];
488 int status = _nc_read_entry2(tn, filename, tp);
489
490 /*
491 * If we have an entry, force all of the cancelled strings to null
492 * pointers so we don't have to test them in the rest of the library.
493 * (The terminfo compiler bypasses this logic, since it must know if
494 * a string is cancelled, for merging entries).
495 */
496 if (status == TGETENT_YES) {
497 unsigned n;
498 for_each_boolean(n, tp) {
499 if (!VALID_BOOLEAN(tp->Booleans[n]))
500 tp->Booleans[n] = FALSE;
501 }
502 for_each_string(n, tp) {
503 if (tp->Strings[n] == CANCELLED_STRING)
504 tp->Strings[n] = ABSENT_STRING;
505 }
506 }
507 return (status);
508 }
509 #endif
510
511 /*
512 ** Take the real command character out of the CC environment variable
513 ** and substitute it in for the prototype given in 'command_character'.
514 */
515 void
_nc_tinfo_cmdch(TERMINAL * termp,int proto)516 _nc_tinfo_cmdch(TERMINAL *termp, int proto)
517 {
518 char *tmp;
519
520 /*
521 * Only use the character if the string is a single character,
522 * since it is fairly common for developers to set the C compiler
523 * name as an environment variable - using the same symbol.
524 */
525 if ((tmp = getenv("CC")) != 0 && strlen(tmp) == 1) {
526 unsigned i;
527 char CC = *tmp;
528
529 for_each_string(i, &(termp->type)) {
530 for (tmp = termp->type.Strings[i]; tmp && *tmp; tmp++) {
531 if (UChar(*tmp) == proto)
532 *tmp = CC;
533 }
534 }
535 }
536 }
537
538 /*
539 * Find the locale which is in effect.
540 */
541 NCURSES_EXPORT(char *)
_nc_get_locale(void)542 _nc_get_locale(void)
543 {
544 char *env;
545 #if HAVE_LOCALE_H
546 /*
547 * This is preferable to using getenv() since it ensures that we are using
548 * the locale which was actually initialized by the application.
549 */
550 env = setlocale(LC_CTYPE, 0);
551 #else
552 if (((env = getenv("LANG")) != 0 && *env != '\0')
553 || ((env = getenv("LC_CTYPE")) != 0 && *env != '\0')
554 || ((env = getenv("LC_ALL")) != 0 && *env != '\0')) {
555 ;
556 }
557 #endif
558 T(("_nc_get_locale %s", _nc_visbuf(env)));
559 return env;
560 }
561
562 /*
563 * Check if we are running in a UTF-8 locale.
564 */
565 NCURSES_EXPORT(int)
_nc_unicode_locale(void)566 _nc_unicode_locale(void)
567 {
568 int result = 0;
569 #if defined(_WIN32) && USE_WIDEC_SUPPORT
570 result = 1;
571 #elif HAVE_LANGINFO_CODESET
572 char *env = nl_langinfo(CODESET);
573 result = !strcmp(env, "UTF-8");
574 T(("_nc_unicode_locale(%s) ->%d", env, result));
575 #else
576 char *env = _nc_get_locale();
577 if (env != 0) {
578 if (strstr(env, ".UTF-8") != 0) {
579 result = 1;
580 T(("_nc_unicode_locale(%s) ->%d", env, result));
581 }
582 }
583 #endif
584 return result;
585 }
586
587 #define CONTROL_N(s) ((s) != 0 && strstr(s, "\016") != 0)
588 #define CONTROL_O(s) ((s) != 0 && strstr(s, "\017") != 0)
589
590 /*
591 * Check for known broken cases where a UTF-8 locale breaks the alternate
592 * character set.
593 */
594 NCURSES_EXPORT(int)
_nc_locale_breaks_acs(TERMINAL * termp)595 _nc_locale_breaks_acs(TERMINAL *termp)
596 {
597 const char *env_name = "NCURSES_NO_UTF8_ACS";
598 const char *env;
599 int value;
600 int result = 0;
601
602 T((T_CALLED("_nc_locale_breaks_acs:%d"), result));
603 if (getenv(env_name) != 0) {
604 result = _nc_getenv_num(env_name);
605 } else if ((value = tigetnum("U8")) >= 0) {
606 result = value; /* use extension feature */
607 } else if ((env = getenv("TERM")) != 0) {
608 if (strstr(env, "linux")) {
609 result = 1; /* always broken */
610 } else if (strstr(env, "screen") != 0
611 && ((env = getenv("TERMCAP")) != 0
612 && strstr(env, "screen") != 0)
613 && strstr(env, "hhII00") != 0) {
614 if (CONTROL_N(enter_alt_charset_mode) ||
615 CONTROL_O(enter_alt_charset_mode) ||
616 CONTROL_N(set_attributes) ||
617 CONTROL_O(set_attributes)) {
618 result = 1;
619 }
620 }
621 }
622 returnCode(result);
623 }
624
625 NCURSES_EXPORT(int)
TINFO_SETUP_TERM(TERMINAL ** tp,const char * tname,int Filedes,int * errret,int reuse)626 TINFO_SETUP_TERM(TERMINAL **tp,
627 const char *tname,
628 int Filedes,
629 int *errret,
630 int reuse)
631 {
632 #ifdef USE_TERM_DRIVER
633 TERMINAL_CONTROL_BLOCK *TCB = 0;
634 #endif
635 TERMINAL *termp;
636 SCREEN *sp = 0;
637 char *myname;
638 int code = ERR;
639
640 START_TRACE();
641
642 #ifdef USE_TERM_DRIVER
643 T((T_CALLED("_nc_setupterm_ex(%p,%s,%d,%p)"),
644 (void *) tp, _nc_visbuf(tname), Filedes, (void *) errret));
645
646 if (tp == 0) {
647 ret_error0(TGETENT_ERR,
648 "Invalid parameter, internal error.\n");
649 } else
650 termp = *tp;
651 #else
652 termp = cur_term;
653 T((T_CALLED("setupterm(%s,%d,%p)"), _nc_visbuf(tname), Filedes, (void *) errret));
654 #endif
655
656 if (tname == 0) {
657 tname = getenv("TERM");
658 if (tname == 0 || *tname == '\0') {
659 #ifdef USE_TERM_DRIVER
660 tname = "unknown";
661 #else
662 ret_error0(TGETENT_ERR, "TERM environment variable not set.\n");
663 #endif
664 }
665 }
666 myname = strdup(tname);
667
668 if (strlen(myname) > MAX_NAME_SIZE) {
669 ret_error(TGETENT_ERR,
670 "TERM environment must be <= %d characters.\n",
671 MAX_NAME_SIZE,
672 free(myname));
673 }
674
675 T(("your terminal name is %s", myname));
676
677 /*
678 * Allow output redirection. This is what SVr3 does. If stdout is
679 * directed to a file, screen updates go to standard error.
680 */
681 if (Filedes == STDOUT_FILENO && !NC_ISATTY(Filedes))
682 Filedes = STDERR_FILENO;
683
684 /*
685 * Check if we have already initialized to use this terminal. If so, we
686 * do not need to re-read the terminfo entry, or obtain TTY settings.
687 *
688 * This is an improvement on SVr4 curses. If an application mixes curses
689 * and termcap calls, it may call both initscr and tgetent. This is not
690 * really a good thing to do, but can happen if someone tries using ncurses
691 * with the readline library. The problem we are fixing is that when
692 * tgetent calls setupterm, the resulting Ottyb struct in cur_term is
693 * zeroed. A subsequent call to endwin uses the zeroed terminal settings
694 * rather than the ones saved in initscr. So we check if cur_term appears
695 * to contain terminal settings for the same output file as our current
696 * call - and copy those terminal settings. (SVr4 curses does not do this,
697 * however applications that are working around the problem will still work
698 * properly with this feature).
699 */
700 if (reuse
701 && (termp != 0)
702 && termp->Filedes == Filedes
703 && termp->_termname != 0
704 && !strcmp(termp->_termname, myname)
705 && _nc_name_match(TerminalType(termp).term_names, myname, "|")) {
706 T(("reusing existing terminal information and mode-settings"));
707 code = OK;
708 #ifdef USE_TERM_DRIVER
709 TCB = (TERMINAL_CONTROL_BLOCK *) termp;
710 #endif
711 } else {
712 #ifdef USE_TERM_DRIVER
713 TERMINAL_CONTROL_BLOCK *my_tcb;
714 termp = 0;
715 if ((my_tcb = typeCalloc(TERMINAL_CONTROL_BLOCK, 1)) != 0)
716 termp = &(my_tcb->term);
717 #else
718 int status;
719
720 termp = typeCalloc(TERMINAL, 1);
721 #endif
722 if (termp == 0) {
723 ret_error1(TGETENT_ERR,
724 "Not enough memory to create terminal structure.\n",
725 myname, free(myname));
726 }
727 #if HAVE_SYSCONF
728 {
729 long limit;
730 #ifdef LINE_MAX
731 limit = LINE_MAX;
732 #else
733 limit = _nc_globals.getstr_limit;
734 #endif
735 #ifdef _SC_LINE_MAX
736 if (limit < sysconf(_SC_LINE_MAX))
737 limit = sysconf(_SC_LINE_MAX);
738 #endif
739 if (_nc_globals.getstr_limit < (int) limit)
740 _nc_globals.getstr_limit = (int) limit;
741 }
742 #endif /* HAVE_SYSCONF */
743 T(("using %d for getstr limit", _nc_globals.getstr_limit));
744
745 #ifdef USE_TERM_DRIVER
746 INIT_TERM_DRIVER();
747 TCB = (TERMINAL_CONTROL_BLOCK *) termp;
748 code = _nc_globals.term_driver(TCB, myname, errret);
749 if (code == OK) {
750 termp->Filedes = (short) Filedes;
751 termp->_termname = strdup(myname);
752 } else {
753 ret_error1(errret ? *errret : TGETENT_ERR,
754 "Could not find any driver to handle terminal.\n",
755 myname, free(myname));
756 }
757 #else
758 #if NCURSES_USE_DATABASE || NCURSES_USE_TERMCAP
759 status = _nc_setup_tinfo(myname, &TerminalType(termp));
760 T(("_nc_setup_tinfo returns %d", status));
761 #else
762 T(("no database available"));
763 status = TGETENT_NO;
764 #endif
765
766 /* try fallback list if entry on disk */
767 if (status != TGETENT_YES) {
768 const TERMTYPE2 *fallback = _nc_fallback2(myname);
769
770 if (fallback) {
771 T(("found fallback entry"));
772 _nc_copy_termtype2(&(TerminalType(termp)), fallback);
773 status = TGETENT_YES;
774 }
775 }
776
777 if (status != TGETENT_YES) {
778 del_curterm(termp);
779 if (status == TGETENT_ERR) {
780 free(myname);
781 ret_error0(status, "terminals database is inaccessible\n");
782 } else if (status == TGETENT_NO) {
783 ret_error1(status, "unknown terminal type.\n",
784 myname, free(myname));
785 } else {
786 ret_error0(status, "unexpected return-code\n");
787 }
788 }
789 #if NCURSES_EXT_NUMBERS
790 _nc_export_termtype2(&termp->type, &TerminalType(termp));
791 #endif
792 #if !USE_REENTRANT
793 save_ttytype(termp);
794 #endif
795
796 termp->Filedes = (short) Filedes;
797 termp->_termname = strdup(myname);
798
799 set_curterm(termp);
800
801 if (command_character)
802 _nc_tinfo_cmdch(termp, UChar(*command_character));
803
804 /*
805 * If an application calls setupterm() rather than initscr() or
806 * newterm(), we will not have the def_prog_mode() call in
807 * _nc_setupscreen(). Do it now anyway, so we can initialize the
808 * baudrate. Also get the shell-mode so that erasechar() works.
809 */
810 if (NC_ISATTY(Filedes)) {
811 NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
812 NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
813 baudrate();
814 }
815 code = OK;
816 #endif
817 }
818
819 #ifdef USE_TERM_DRIVER
820 *tp = termp;
821 NCURSES_SP_NAME(set_curterm) (sp, termp);
822 TCB->drv->td_init(TCB);
823 #else
824 sp = SP;
825 #endif
826
827 /*
828 * We should always check the screensize, just in case.
829 */
830 TINFO_GET_SIZE(sp, termp, ptrLines(sp), ptrCols(sp));
831
832 if (errret)
833 *errret = TGETENT_YES;
834
835 #ifndef USE_TERM_DRIVER
836 if (generic_type) {
837 /*
838 * BSD 4.3's termcap contains mis-typed "gn" for wy99. Do a sanity
839 * check before giving up.
840 */
841 if ((VALID_STRING(cursor_address)
842 || (VALID_STRING(cursor_down) && VALID_STRING(cursor_home)))
843 && VALID_STRING(clear_screen)) {
844 ret_error1(TGETENT_YES, "terminal is not really generic.\n",
845 myname, free(myname));
846 } else {
847 del_curterm(termp);
848 ret_error1(TGETENT_NO, "I need something more specific.\n",
849 myname, free(myname));
850 }
851 } else if (hard_copy) {
852 ret_error1(TGETENT_YES, "I can't handle hardcopy terminals.\n",
853 myname, free(myname));
854 }
855 #endif
856 free(myname);
857 returnCode(code);
858 }
859
860 #ifdef USE_PTHREADS
861 /*
862 * Returns a non-null pointer unless a new screen should be allocated because
863 * no match was found in the pre-screen cache.
864 */
865 NCURSES_EXPORT(SCREEN *)
_nc_find_prescr(void)866 _nc_find_prescr(void)
867 {
868 SCREEN *result = 0;
869 PRESCREEN_LIST *p;
870 pthread_t id = GetThreadID();
871 for (p = _nc_prescreen.allocated; p != 0; p = p->next) {
872 if (p->id == id) {
873 result = p->sp;
874 break;
875 }
876 }
877 return result;
878 }
879
880 /*
881 * Tells ncurses to forget that this thread was associated with the pre-screen
882 * cache. It does not modify the pre-screen cache itself, since that is used
883 * for creating new screens.
884 */
885 NCURSES_EXPORT(void)
_nc_forget_prescr(void)886 _nc_forget_prescr(void)
887 {
888 PRESCREEN_LIST *p, *q;
889 pthread_t id = GetThreadID();
890 for (p = _nc_prescreen.allocated, q = 0; p != 0; q = p, p = p->next) {
891 if (p->id == id) {
892 if (q) {
893 q->next = p->next;
894 } else {
895 _nc_prescreen.allocated = p->next;
896 }
897 free(p);
898 break;
899 }
900 }
901 }
902 #endif /* USE_PTHREADS */
903
904 #if NCURSES_SP_FUNCS
905 /*
906 * In case of handling multiple screens, we need to have a screen before
907 * initialization in _nc_setupscreen takes place. This is to extend the
908 * substitute for some of the stuff in _nc_prescreen, especially for slk and
909 * ripoff handling which should be done per screen.
910 */
911 NCURSES_EXPORT(SCREEN *)
new_prescr(void)912 new_prescr(void)
913 {
914 SCREEN *sp;
915
916 START_TRACE();
917 T((T_CALLED("new_prescr()")));
918
919 _nc_lock_global(screen);
920 if ((sp = _nc_find_prescr()) == 0) {
921 sp = _nc_alloc_screen_sp();
922 T(("_nc_alloc_screen_sp %p", (void *) sp));
923 if (sp != 0) {
924 #ifdef USE_PTHREADS
925 PRESCREEN_LIST *p = typeCalloc(PRESCREEN_LIST, 1);
926 if (p != 0) {
927 p->id = GetThreadID();
928 p->sp = sp;
929 p->next = _nc_prescreen.allocated;
930 _nc_prescreen.allocated = p;
931 }
932 #else
933 _nc_prescreen.allocated = sp;
934 #endif
935 sp->rsp = sp->rippedoff;
936 sp->_filtered = _nc_prescreen.filter_mode;
937 sp->_use_env = _nc_prescreen.use_env;
938 #if NCURSES_NO_PADDING
939 sp->_no_padding = _nc_prescreen._no_padding;
940 #endif
941 sp->slk_format = 0;
942 sp->_slk = 0;
943 sp->_prescreen = TRUE;
944 SP_PRE_INIT(sp);
945 #if USE_REENTRANT
946 sp->_TABSIZE = _nc_prescreen._TABSIZE;
947 sp->_ESCDELAY = _nc_prescreen._ESCDELAY;
948 #endif
949 }
950 } else {
951 T(("_nc_alloc_screen_sp %p (reuse)", (void *) sp));
952 }
953 _nc_unlock_global(screen);
954 returnSP(sp);
955 }
956 #endif
957
958 #ifdef USE_TERM_DRIVER
959 /*
960 * This entrypoint is called from tgetent() to allow a special case of reusing
961 * the same TERMINAL data (see comment).
962 */
963 NCURSES_EXPORT(int)
_nc_setupterm(const char * tname,int Filedes,int * errret,int reuse)964 _nc_setupterm(const char *tname,
965 int Filedes,
966 int *errret,
967 int reuse)
968 {
969 int rc = ERR;
970 TERMINAL *termp = 0;
971
972 _nc_lock_global(prescreen);
973 START_TRACE();
974 if (TINFO_SETUP_TERM(&termp, tname, Filedes, errret, reuse) == OK) {
975 _nc_forget_prescr();
976 if (NCURSES_SP_NAME(set_curterm) (CURRENT_SCREEN_PRE, termp) != 0) {
977 rc = OK;
978 }
979 }
980 _nc_unlock_global(prescreen);
981 return rc;
982 }
983 #endif
984
985 /*
986 * setupterm(termname, Filedes, errret)
987 *
988 * Find and read the appropriate object file for the terminal
989 * Make cur_term point to the structure.
990 */
991 NCURSES_EXPORT(int)
setupterm(const char * tname,int Filedes,int * errret)992 setupterm(const char *tname, int Filedes, int *errret)
993 {
994 START_TRACE();
995 return _nc_setupterm(tname, Filedes, errret, FALSE);
996 }
997