xref: /freebsd/contrib/nvi/cl/cl_screen.c (revision 110d525ec6188f3c9dc4f54c4bc1cced2f7184cd)
1 /*-
2  * Copyright (c) 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  * Copyright (c) 1993, 1994, 1995, 1996
5  *	Keith Bostic.  All rights reserved.
6  *
7  * See the LICENSE file for redistribution information.
8  */
9 
10 #include "config.h"
11 
12 #include <sys/types.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15 
16 #include <bitstring.h>
17 #include <errno.h>
18 #include <signal.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #ifdef HAVE_TERM_H
23 #include <term.h>
24 #endif
25 #include <termios.h>
26 #include <unistd.h>
27 
28 #include "../common/common.h"
29 #include "cl.h"
30 
31 static int	cl_ex_end(GS *);
32 static int	cl_ex_init(SCR *);
33 static void	cl_freecap(CL_PRIVATE *);
34 static int	cl_vi_end(GS *);
35 static int	cl_vi_init(SCR *);
36 static int	cl_putenv(char *, char *, u_long);
37 
38 /*
39  * cl_screen --
40  *	Switch screen types.
41  *
42  * PUBLIC: int cl_screen(SCR *, u_int32_t);
43  */
44 int
cl_screen(SCR * sp,u_int32_t flags)45 cl_screen(SCR *sp, u_int32_t flags)
46 {
47 	CL_PRIVATE *clp;
48 	WINDOW *win;
49 	GS *gp;
50 
51 	gp = sp->gp;
52 	clp = CLP(sp);
53 	win = CLSP(sp) ? CLSP(sp) : stdscr;
54 
55 	/* See if the current information is incorrect. */
56 	if (F_ISSET(gp, G_SRESTART)) {
57 		if ((!F_ISSET(sp, SC_SCR_EX | SC_SCR_VI) ||
58 		     resizeterm(O_VAL(sp, O_LINES), O_VAL(sp, O_COLUMNS))) &&
59 		    cl_quit(gp))
60 			return (1);
61 		F_CLR(gp, G_SRESTART);
62 	}
63 
64 	/* See if we're already in the right mode. */
65 	if ((LF_ISSET(SC_EX) && F_ISSET(sp, SC_SCR_EX)) ||
66 	    (LF_ISSET(SC_VI) && F_ISSET(sp, SC_SCR_VI)))
67 		return (0);
68 
69 	/*
70 	 * Fake leaving ex mode.
71 	 *
72 	 * We don't actually exit ex or vi mode unless forced (e.g. by a window
73 	 * size change).  This is because many curses implementations can't be
74 	 * called twice in a single program.  Plus, it's faster.  If the editor
75 	 * "leaves" vi to enter ex, when it exits ex we'll just fall back into
76 	 * vi.
77 	 */
78 	if (F_ISSET(sp, SC_SCR_EX))
79 		F_CLR(sp, SC_SCR_EX);
80 
81 	/*
82 	 * Fake leaving vi mode.
83 	 *
84 	 * Clear out the rest of the screen if we're in the middle of a split
85 	 * screen.  Move to the last line in the current screen -- this makes
86 	 * terminal scrolling happen naturally.  Note: *don't* move past the
87 	 * end of the screen, as there are ex commands (e.g., :read ! cat file)
88 	 * that don't want to.  Don't clear the info line, its contents may be
89 	 * valid, e.g. :file|append.
90 	 */
91 	if (F_ISSET(sp, SC_SCR_VI)) {
92 		F_CLR(sp, SC_SCR_VI);
93 
94 		if (TAILQ_NEXT(sp, q) != NULL) {
95 			(void)wmove(win, RLNO(sp, sp->rows), 0);
96 			wclrtobot(win);
97 		}
98 		(void)wmove(win, RLNO(sp, sp->rows) - 1, 0);
99 		wrefresh(win);
100 	}
101 
102 	/* Enter the requested mode. */
103 	if (LF_ISSET(SC_EX)) {
104 		if (cl_ex_init(sp))
105 			return (1);
106 		F_SET(clp, CL_IN_EX | CL_SCR_EX_INIT);
107 
108 		/*
109 		 * If doing an ex screen for ex mode, move to the last line
110 		 * on the screen.
111 		 */
112 		if (F_ISSET(sp, SC_EX) && clp->cup != NULL)
113 			tputs(tgoto(clp->cup,
114 			    0, O_VAL(sp, O_LINES) - 1), 1, cl_putchar);
115 	} else {
116 		if (cl_vi_init(sp))
117 			return (1);
118 		F_CLR(clp, CL_IN_EX);
119 		F_SET(clp, CL_SCR_VI_INIT);
120 	}
121 	return (0);
122 }
123 
124 /*
125  * cl_quit --
126  *	Shutdown the screens.
127  *
128  * PUBLIC: int cl_quit(GS *);
129  */
130 int
cl_quit(GS * gp)131 cl_quit(GS *gp)
132 {
133 	CL_PRIVATE *clp;
134 	int rval;
135 
136 	rval = 0;
137 	clp = GCLP(gp);
138 
139 	/*
140 	 * If we weren't really running, ignore it.  This happens if the
141 	 * screen changes size before we've called curses.
142 	 */
143 	if (!F_ISSET(clp, CL_SCR_EX_INIT | CL_SCR_VI_INIT))
144 		return (0);
145 
146 	/* Clean up the terminal mappings. */
147 	if (cl_term_end(gp))
148 		rval = 1;
149 
150 	/* Really leave vi mode. */
151 	if (F_ISSET(clp, CL_STDIN_TTY) &&
152 	    F_ISSET(clp, CL_SCR_VI_INIT) && cl_vi_end(gp))
153 		rval = 1;
154 
155 	/* Really leave ex mode. */
156 	if (F_ISSET(clp, CL_STDIN_TTY) &&
157 	    F_ISSET(clp, CL_SCR_EX_INIT) && cl_ex_end(gp))
158 		rval = 1;
159 
160 	/*
161 	 * If we were running ex when we quit, or we're using an implementation
162 	 * of curses where endwin() doesn't get this right, restore the original
163 	 * terminal modes.
164 	 *
165 	 * XXX
166 	 * We always do this because it's too hard to figure out what curses
167 	 * implementations get it wrong.  It may discard type-ahead characters
168 	 * from the tty queue.
169 	 */
170 	(void)tcsetattr(STDIN_FILENO, TCSADRAIN | TCSASOFT, &clp->orig);
171 
172 	F_CLR(clp, CL_SCR_EX_INIT | CL_SCR_VI_INIT);
173 	return (rval);
174 }
175 
176 /*
177  * cl_vi_init --
178  *	Initialize the curses vi screen.
179  */
180 static int
cl_vi_init(SCR * sp)181 cl_vi_init(SCR *sp)
182 {
183 	CL_PRIVATE *clp;
184 	GS *gp;
185 	char *o_cols, *o_lines, *o_term, *ttype;
186 
187 	gp = sp->gp;
188 	clp = CLP(sp);
189 
190 	/* If already initialized, just set the terminal modes. */
191 	if (F_ISSET(clp, CL_SCR_VI_INIT))
192 		goto fast;
193 
194 	/* Curses vi always reads from (and writes to) a terminal. */
195 	if (!F_ISSET(clp, CL_STDIN_TTY) || !isatty(STDOUT_FILENO)) {
196 		msgq(sp, M_ERR,
197 		    "016|Vi's standard input and output must be a terminal");
198 		return (1);
199 	}
200 
201 	/* We'll need a terminal type. */
202 	if (opts_empty(sp, O_TERM, 0))
203 		return (1);
204 	ttype = O_STR(sp, O_TERM);
205 
206 	/*
207 	 * XXX
208 	 * Changing the row/column and terminal values is done by putting them
209 	 * into the environment, which is then read by curses.  What this loses
210 	 * in ugliness, it makes up for in stupidity.  We can't simply put the
211 	 * values into the environment ourselves, because in the presence of a
212 	 * kernel mechanism for returning the window size, entering values into
213 	 * the environment will screw up future screen resizing events, e.g. if
214 	 * the user enters a :shell command and then resizes their window.  So,
215 	 * if they weren't already in the environment, we make sure to delete
216 	 * them immediately after setting them.
217 	 *
218 	 * XXX
219 	 * Putting the TERM variable into the environment is necessary, even
220 	 * though we're using newterm() here.  We may be using initscr() as
221 	 * the underlying function.
222 	 */
223 	o_term = getenv("TERM");
224 	cl_putenv("TERM", ttype, 0);
225 	o_lines = getenv("LINES");
226 	cl_putenv("LINES", NULL, (u_long)O_VAL(sp, O_LINES));
227 	o_cols = getenv("COLUMNS");
228 	cl_putenv("COLUMNS", NULL, (u_long)O_VAL(sp, O_COLUMNS));
229 
230 	/*
231 	 * The terminal is aways initialized, either in `main`, or by a
232 	 * previous call to newterm(3X).
233 	 */
234 	(void)del_curterm(cur_term);
235 
236 	/*
237 	 * We never have more than one SCREEN at a time, so set_term(NULL) will
238 	 * give us the last SCREEN.
239 	 */
240 	errno = 0;
241 	if (newterm(ttype, stdout, stdin) == NULL) {
242 		if (errno)
243 			msgq(sp, M_SYSERR, "%s", ttype);
244 		else
245 			msgq(sp, M_ERR, "%s: unknown terminal type", ttype);
246 		return (1);
247 	}
248 
249 	if (o_term == NULL)
250 		unsetenv("TERM");
251 	if (o_lines == NULL)
252 		unsetenv("LINES");
253 	if (o_cols == NULL)
254 		unsetenv("COLUMNS");
255 
256 	/*
257 	 * XXX
258 	 * Someone got let out alone without adult supervision -- the SunOS
259 	 * newterm resets the signal handlers.  There's a race, but it's not
260 	 * worth closing.
261 	 */
262 	(void)sig_init(sp->gp, sp);
263 
264 	/*
265 	 * We use raw mode.  What we want is 8-bit clean, however, signals
266 	 * and flow control should continue to work.  Admittedly, it sounds
267 	 * like cbreak, but it isn't.  Using cbreak() can get you additional
268 	 * things like IEXTEN, which turns on flags like DISCARD and LNEXT.
269 	 *
270 	 * !!!
271 	 * If raw isn't turning off echo and newlines, something's wrong.
272 	 * However, it shouldn't hurt.
273 	 */
274 	noecho();			/* No character echo. */
275 	nonl();				/* No CR/NL translation. */
276 	raw();				/* 8-bit clean. */
277 	idlok(stdscr, 1);		/* Use hardware insert/delete line. */
278 
279 	/* Put the cursor keys into application mode. */
280 	(void)keypad(stdscr, TRUE);
281 
282 	/*
283 	 * XXX
284 	 * The screen TI sequence just got sent.  See the comment in
285 	 * cl_funcs.c:cl_attr().
286 	 */
287 	clp->ti_te = TI_SENT;
288 
289 	/*
290 	 * XXX
291 	 * Historic implementations of curses handled SIGTSTP signals
292 	 * in one of three ways.  They either:
293 	 *
294 	 *	1: Set their own handler, regardless.
295 	 *	2: Did not set a handler if a handler was already installed.
296 	 *	3: Set their own handler, but then called any previously set
297 	 *	   handler after completing their own cleanup.
298 	 *
299 	 * We don't try and figure out which behavior is in place, we force
300 	 * it to SIG_DFL after initializing the curses interface, which means
301 	 * that curses isn't going to take the signal.  Since curses isn't
302 	 * reentrant (i.e., the whole curses SIGTSTP interface is a fantasy),
303 	 * we're doing The Right Thing.
304 	 */
305 	(void)signal(SIGTSTP, SIG_DFL);
306 
307 	/*
308 	 * If flow control was on, turn it back on.  Turn signals on.  ISIG
309 	 * turns on VINTR, VQUIT, VDSUSP and VSUSP.   The main curses code
310 	 * already installed a handler for VINTR.  We're going to disable the
311 	 * other three.
312 	 *
313 	 * XXX
314 	 * We want to use ^Y as a vi scrolling command.  If the user has the
315 	 * DSUSP character set to ^Y (common practice) clean it up.  As it's
316 	 * equally possible that the user has VDSUSP set to 'a', we disable
317 	 * it regardless.  It doesn't make much sense to suspend vi at read,
318 	 * so I don't think anyone will care.  Alternatively, we could look
319 	 * it up in the table of legal command characters and turn it off if
320 	 * it matches one.  VDSUSP wasn't in POSIX 1003.1-1990, so we test for
321 	 * it.
322 	 *
323 	 * XXX
324 	 * We don't check to see if the user had signals enabled originally.
325 	 * If they didn't, it's unclear what we're supposed to do here, but
326 	 * it's also pretty unlikely.
327 	 */
328 	if (tcgetattr(STDIN_FILENO, &clp->vi_enter)) {
329 		msgq(sp, M_SYSERR, "tcgetattr");
330 		goto err;
331 	}
332 	if (clp->orig.c_iflag & IXON)
333 		clp->vi_enter.c_iflag |= IXON;
334 	if (clp->orig.c_iflag & IXOFF)
335 		clp->vi_enter.c_iflag |= IXOFF;
336 
337 	clp->vi_enter.c_lflag |= ISIG;
338 #ifdef VDSUSP
339 	clp->vi_enter.c_cc[VDSUSP] = _POSIX_VDISABLE;
340 #endif
341 	clp->vi_enter.c_cc[VQUIT] = _POSIX_VDISABLE;
342 	clp->vi_enter.c_cc[VSUSP] = _POSIX_VDISABLE;
343 
344 	/*
345 	 * XXX
346 	 * OSF/1 doesn't turn off the <discard>, <literal-next> or <status>
347 	 * characters when curses switches into raw mode.  It should be OK
348 	 * to do it explicitly for everyone.
349 	 */
350 #ifdef VDISCARD
351 	clp->vi_enter.c_cc[VDISCARD] = _POSIX_VDISABLE;
352 #endif
353 #ifdef VLNEXT
354 	clp->vi_enter.c_cc[VLNEXT] = _POSIX_VDISABLE;
355 #endif
356 #ifdef VSTATUS
357 	clp->vi_enter.c_cc[VSTATUS] = _POSIX_VDISABLE;
358 #endif
359 
360 	/* Initialize terminal based information. */
361 	if (cl_term_init(sp))
362 		goto err;
363 
364 fast:	/* Set the terminal modes. */
365 	if (tcsetattr(STDIN_FILENO, TCSASOFT | TCSADRAIN, &clp->vi_enter)) {
366 		if (errno == EINTR)
367 			goto fast;
368 		msgq(sp, M_SYSERR, "tcsetattr");
369 err:		(void)cl_vi_end(sp->gp);
370 		return (1);
371 	}
372 	return (0);
373 }
374 
375 /*
376  * cl_vi_end --
377  *	Shutdown the vi screen.
378  */
379 static int
cl_vi_end(GS * gp)380 cl_vi_end(GS *gp)
381 {
382 	CL_PRIVATE *clp;
383 
384 	clp = GCLP(gp);
385 
386 	/* Restore the cursor keys to normal mode. */
387 	(void)keypad(stdscr, FALSE);
388 
389 	/*
390 	 * If we were running vi when we quit, scroll the screen up a single
391 	 * line so we don't lose any information.
392 	 *
393 	 * Move to the bottom of the window (some endwin implementations don't
394 	 * do this for you).
395 	 */
396 	if (!F_ISSET(clp, CL_IN_EX)) {
397 		(void)move(0, 0);
398 		(void)deleteln();
399 		(void)move(LINES - 1, 0);
400 		(void)refresh();
401 	}
402 
403 	cl_freecap(clp);
404 
405 	/* End curses window. */
406 	(void)endwin();
407 
408 	/* Free the SCREEN created by newterm(3X). */
409 	delscreen(set_term(NULL));
410 
411 	/*
412 	 * XXX
413 	 * The screen TE sequence just got sent.  See the comment in
414 	 * cl_funcs.c:cl_attr().
415 	 */
416 	clp->ti_te = TE_SENT;
417 
418 	return (0);
419 }
420 
421 /*
422  * cl_ex_init --
423  *	Initialize the ex screen.
424  */
425 static int
cl_ex_init(SCR * sp)426 cl_ex_init(SCR *sp)
427 {
428 	CL_PRIVATE *clp;
429 
430 	clp = CLP(sp);
431 
432 	/* If already initialized, just set the terminal modes. */
433 	if (F_ISSET(clp, CL_SCR_EX_INIT))
434 		goto fast;
435 
436 	/* If not reading from a file, we're done. */
437 	if (!F_ISSET(clp, CL_STDIN_TTY))
438 		return (0);
439 
440 	/* Get the ex termcap/terminfo strings. */
441 	(void)cl_getcap(sp, "cup", &clp->cup);
442 	(void)cl_getcap(sp, "smso", &clp->smso);
443 	(void)cl_getcap(sp, "rmso", &clp->rmso);
444 	(void)cl_getcap(sp, "el", &clp->el);
445 	(void)cl_getcap(sp, "cuu1", &clp->cuu1);
446 
447 	/* Enter_standout_mode and exit_standout_mode are paired. */
448 	if (clp->smso == NULL || clp->rmso == NULL) {
449 		free(clp->smso);
450 		clp->smso = NULL;
451 
452 		free(clp->rmso);
453 		clp->rmso = NULL;
454 	}
455 
456 	/*
457 	 * Turn on canonical mode, with normal input and output processing.
458 	 * Start with the original terminal settings as the user probably
459 	 * had them (including any local extensions) set correctly for the
460 	 * current terminal.
461 	 *
462 	 * !!!
463 	 * We can't get everything that we need portably; for example, ONLCR,
464 	 * mapping <newline> to <carriage-return> on output isn't required
465 	 * by POSIX 1003.1b-1993.  If this turns out to be a problem, then
466 	 * we'll either have to play some games on the mapping, or we'll have
467 	 * to make all ex printf's output \r\n instead of \n.
468 	 */
469 	clp->ex_enter = clp->orig;
470 	clp->ex_enter.c_lflag  |= ECHO | ECHOE | ECHOK | ICANON | IEXTEN | ISIG;
471 #ifdef ECHOCTL
472 	clp->ex_enter.c_lflag |= ECHOCTL;
473 #endif
474 #ifdef ECHOKE
475 	clp->ex_enter.c_lflag |= ECHOKE;
476 #endif
477 	clp->ex_enter.c_iflag |= ICRNL;
478 	clp->ex_enter.c_oflag |= OPOST;
479 #ifdef ONLCR
480 	clp->ex_enter.c_oflag |= ONLCR;
481 #endif
482 
483 fast:	if (tcsetattr(STDIN_FILENO, TCSADRAIN | TCSASOFT, &clp->ex_enter)) {
484 		if (errno == EINTR)
485 			goto fast;
486 		msgq(sp, M_SYSERR, "tcsetattr");
487 		return (1);
488 	}
489 	return (0);
490 }
491 
492 /*
493  * cl_ex_end --
494  *	Shutdown the ex screen.
495  */
496 static int
cl_ex_end(GS * gp)497 cl_ex_end(GS *gp)
498 {
499 	CL_PRIVATE *clp;
500 
501 	clp = GCLP(gp);
502 
503 	cl_freecap(clp);
504 
505 	return (0);
506 }
507 
508 /*
509  * cl_getcap --
510  *	Retrieve termcap/terminfo strings.
511  *
512  * PUBLIC: int cl_getcap(SCR *, char *, char **);
513  */
514 int
cl_getcap(SCR * sp,char * name,char ** elementp)515 cl_getcap(SCR *sp, char *name, char **elementp)
516 {
517 	size_t len;
518 	char *t;
519 
520 	if ((t = tigetstr(name)) != NULL &&
521 	    t != (char *)-1 && (len = strlen(t)) != 0) {
522 		MALLOC_RET(sp, *elementp, len + 1);
523 		memmove(*elementp, t, len + 1);
524 	}
525 	return (0);
526 }
527 
528 /*
529  * cl_freecap --
530  *	Free any allocated termcap/terminfo strings.
531  */
532 static void
cl_freecap(CL_PRIVATE * clp)533 cl_freecap(CL_PRIVATE *clp)
534 {
535 	free(clp->el);
536 	clp->el = NULL;
537 
538 	free(clp->cup);
539 	clp->cup = NULL;
540 
541 	free(clp->cuu1);
542 	clp->cuu1 = NULL;
543 
544 	free(clp->rmso);
545 	clp->rmso = NULL;
546 
547 	free(clp->smso);
548 	clp->smso = NULL;
549 
550 	/* Required by libcursesw :) */
551 	free(clp->cw.bp1.c);
552 	clp->cw.bp1.c = NULL;
553 	clp->cw.blen1 = 0;
554 }
555 
556 /*
557  * cl_putenv --
558  *	Put a value into the environment.
559  */
560 static int
cl_putenv(char * name,char * str,u_long value)561 cl_putenv(char *name, char *str, u_long value)
562 {
563 	char buf[40];
564 
565 	if (str == NULL) {
566 		(void)snprintf(buf, sizeof(buf), "%lu", value);
567 		return (setenv(name, buf, 1));
568 	} else
569 		return (setenv(name, str, 1));
570 }
571