aboutsummaryrefslogtreecommitdiffstats
path: root/editline/read.c
blob: ccd0a06e5992c4c547ca1c2a51c6431b61810b14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
/*	$NetBSD: read.c,v 1.21 2002/03/18 16:00:57 christos Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Christos Zoulas of Cornell University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)read.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: read.c,v 1.21 2002/03/18 16:00:57 christos Exp $");
#endif
#endif /* not lint && not SCCSID */

/*
 * read.c: Clean this junk up! This is horrible code.
 *	   Terminal read functions
 */
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include "el.h"

#define	OKCMD	-1

private int	read__fixio(int, int);
private int	read_preread(EditLine *);
private int	read_char(EditLine *, char *);
private int	read_getcmd(EditLine *, el_action_t *, char *);

/* read_init():
 *	Initialize the read stuff
 */
protected int
read_init(EditLine *el)
{
	/* builtin read_char */
	el->el_read.read_char = read_char;
	return 0;
}


/* el_read_setfn():
 *	Set the read char function to the one provided.
 *	If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
 */
protected int
el_read_setfn(EditLine *el, el_rfunc_t rc)
{
	el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
	return 0;
}


/* el_read_getfn():
 *	return the current read char function, or EL_BUILTIN_GETCFN
 *	if it is the default one
 */
protected el_rfunc_t
el_read_getfn(EditLine *el)
{
       return (el->el_read.read_char == read_char) ?
	    EL_BUILTIN_GETCFN : el->el_read.read_char;
}


#ifdef DEBUG_EDIT
private void
read_debug(EditLine *el)
{

	if (el->el_line.cursor > el->el_line.lastchar)
		(void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
	if (el->el_line.cursor < el->el_line.buffer)
		(void) fprintf(el->el_errfile, "cursor < buffer\r\n");
	if (el->el_line.cursor > el->el_line.limit)
		(void) fprintf(el->el_errfile, "cursor > limit\r\n");
	if (el->el_line.lastchar > el->el_line.limit)
		(void) fprintf(el->el_errfile, "lastchar > limit\r\n");
	if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
		(void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
}
#endif /* DEBUG_EDIT */


/* read__fixio():
 *	Try to recover from a read error
 */
/* ARGSUSED */
private int
read__fixio(int fd, int e)
{

	switch (e) {
	case -1:		/* Make sure that the code is reachable */

#ifdef EWOULDBLOCK
	case EWOULDBLOCK:
#ifndef TRY_AGAIN
#define	TRY_AGAIN
#endif
#endif /* EWOULDBLOCK */

#if defined(POSIX) && defined(EAGAIN)
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
	case EAGAIN:
#ifndef TRY_AGAIN
#define	TRY_AGAIN
#endif
#endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
#endif /* POSIX && EAGAIN */

		e = 0;
#ifdef TRY_AGAIN
#if defined(F_SETFL) && defined(O_NDELAY)
		if ((e = fcntl(fd, F_GETFL, 0)) == -1)
			return (-1);

		if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
			return (-1);
		else
			e = 1;
#endif /* F_SETFL && O_NDELAY */

#ifdef FIONBIO
		{
			int zero = 0;

			if (ioctl(fd, FIONBIO, (ioctl_t) & zero) == -1)
				return (-1);
			else
				e = 1;
		}
#endif /* FIONBIO */

#endif /* TRY_AGAIN */
		return (e ? 0 : -1);

	case EINTR:
		return (0);

	default:
		return (-1);
	}
}


/* read_preread():
 *	Try to read the stuff in the input queue;
 */
private int
read_preread(EditLine *el)
{
	int chrs = 0;

	if (el->el_chared.c_macro.nline) {
		el_free((ptr_t) el->el_chared.c_macro.nline);
		el->el_chared.c_macro.nline = NULL;
	}
	if (el->el_tty.t_mode == ED_IO)
		return (0);

#ifdef FIONREAD
	(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
	if (chrs > 0) {
		char buf[EL_BUFSIZ];

		chrs = read(el->el_infd, buf,
		    (size_t) MIN(chrs, EL_BUFSIZ - 1));
		if (chrs > 0) {
			buf[chrs] = '\0';
			el->el_chared.c_macro.nline = strdup(buf);
			el_push(el, el->el_chared.c_macro.nline);
		}
	}
#endif /* FIONREAD */

	return (chrs > 0);
}


/* el_push():
 *	Push a macro
 */
public void
el_push(EditLine *el, char *str)
{
	c_macro_t *ma = &el->el_chared.c_macro;

	if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
		ma->level++;
		ma->macro[ma->level] = str;
	} else {
		term_beep(el);
		term__flush();
	}
}


/* read_getcmd():
 *	Return next command from the input stream.
 */
private int
read_getcmd(EditLine *el, el_action_t *cmdnum, char *ch)
{
	el_action_t cmd = ED_UNASSIGNED;
	int num;

	while (cmd == ED_UNASSIGNED || cmd == ED_SEQUENCE_LEAD_IN) {
		if ((num = el_getc(el, ch)) != 1)	/* if EOF or error */
			return (num);

#ifdef	KANJI
		if ((*ch & 0200)) {
			el->el_state.metanext = 0;
			cmd = CcViMap[' '];
			break;
		} else
#endif /* KANJI */

		if (el->el_state.metanext) {
			el->el_state.metanext = 0;
			*ch |= 0200;
		}
		cmd = el->el_map.current[(unsigned char) *ch];
		if (cmd == ED_SEQUENCE_LEAD_IN) {
			key_value_t val;
			switch (key_get(el, ch, &val)) {
			case XK_CMD:
				cmd = val.cmd;
				break;
			case XK_STR:
				el_push(el, val.str);
				break;
#ifdef notyet
			case XK_EXE:
				/* XXX: In the future to run a user function */
				RunCommand(val.str);
				break;
#endif
			default:
				EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
				break;
			}
		}
		if (el->el_map.alt == NULL)
			el->el_map.current = el->el_map.key;
	}
	*cmdnum = cmd;
	return (OKCMD);
}


/* read_char():
 *	Read a character from the tty.
 */
private int
read_char(EditLine *el, char *cp)
{
	int num_read;
	int tried = 0;

	while ((num_read = read(el->el_infd, cp, 1)) == -1)
		if (!tried && read__fixio(el->el_infd, errno) == 0)
			tried = 1;
		else {
			*cp = '\0';
			return (-1);
		}

	return (num_read);
}


/* el_getc():
 *	Read a character
 */
public int
el_getc(EditLine *el, char *cp)
{
	int num_read;
	c_macro_t *ma = &el->el_chared.c_macro;

	term__flush();
	for (;;) {
		if (ma->level < 0) {
			if (!read_preread(el))
				break;
		}
		if (ma->level < 0)
			break;

		if (*ma->macro[ma->level] == 0) {
			ma->level--;
			continue;
		}
		*cp = *ma->macro[ma->level]++ & 0377;
		if (*ma->macro[ma->level] == 0) {	/* Needed for QuoteMode
							 * On */
			ma->level--;
		}
		return (1);
	}

#ifdef DEBUG_READ
	(void) fprintf(el->el_errfile, "Turning raw mode on\n");
#endif /* DEBUG_READ */
	if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
		return (0);

#ifdef DEBUG_READ
	(void) fprintf(el->el_errfile, "Reading a character\n");
#endif /* DEBUG_READ */
	num_read = (*el->el_read.read_char)(el, cp);
#ifdef DEBUG_READ
	(void) fprintf(el->el_errfile, "Got it %c\n", *cp);
#endif /* DEBUG_READ */
	return (num_read);
}


public const char *
el_gets(EditLine *el, int *nread)
{
	int retval;
	el_action_t cmdnum = 0;
	int num;		/* how many chars we have read at NL */
	char ch;
#ifdef FIONREAD
	c_macro_t *ma = &el->el_chared.c_macro;
#endif /* FIONREAD */

	if (el->el_flags & HANDLE_SIGNALS)
		sig_set(el);

	if (el->el_flags & NO_TTY) {
		char *cp = el->el_line.buffer;
		size_t idx;

		while ((*el->el_read.read_char)(el, cp) == 1) {
			/* make sure there is space for next character */
			if (cp + 1 >= el->el_line.limit) {
				idx = (cp - el->el_line.buffer);
				if (!ch_enlargebufs(el, 2))
					break;
				cp = &el->el_line.buffer[idx];
			}
			cp++;
			if (cp[-1] == '\r' || cp[-1] == '\n')
				break;
		}

		el->el_line.cursor = el->el_line.lastchar = cp;
		*cp = '\0';
		if (nread)
			*nread = el->el_line.cursor - el->el_line.buffer;
		return (el->el_line.buffer);
	}
	re_clear_display(el);	/* reset the display stuff */
	ch_reset(el);

#ifdef FIONREAD
	if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
		long chrs = 0;

		(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
		if (chrs == 0) {
			if (tty_rawmode(el) < 0) {
				if (nread)
					*nread = 0;
				return (NULL);
			}
		}
	}
#endif /* FIONREAD */

	re_refresh(el);		/* print the prompt */

	if (el->el_flags & EDIT_DISABLED) {
		char *cp = el->el_line.buffer;
		size_t idx;

		term__flush();

		while ((*el->el_read.read_char)(el, cp) == 1) {
			/* make sure there is space next character */
			if (cp + 1 >= el->el_line.limit) {
				idx = (cp - el->el_line.buffer);
				if (!ch_enlargebufs(el, 2))
					break;
				cp = &el->el_line.buffer[idx];
			}
			cp++;
			if (cp[-1] == '\r' || cp[-1] == '\n')
				break;
		}

		el->el_line.cursor = el->el_line.lastchar = cp;
		*cp = '\0';
		if (nread)
			*nread = el->el_line.cursor - el->el_line.buffer;
		return (el->el_line.buffer);
	}
	for (num = OKCMD; num == OKCMD;) {	/* while still editing this
						 * line */
#ifdef DEBUG_EDIT
		read_debug(el);
#endif /* DEBUG_EDIT */
		/* if EOF or error */
		if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
#ifdef DEBUG_READ
			(void) fprintf(el->el_errfile,
			    "Returning from el_gets %d\n", num);
#endif /* DEBUG_READ */
			break;
		}
		if ((int) cmdnum >= el->el_map.nfunc) {	/* BUG CHECK command */
#ifdef DEBUG_EDIT
			(void) fprintf(el->el_errfile,
			    "ERROR: illegal command from key 0%o\r\n", ch);
#endif /* DEBUG_EDIT */
			continue;	/* try again */
		}
		/* now do the real command */
#ifdef DEBUG_READ
		{
			el_bindings_t *b;
			for (b = el->el_map.help; b->name; b++)
				if (b->func == cmdnum)
					break;
			if (b->name)
				(void) fprintf(el->el_errfile,
				    "Executing %s\n", b->name);
			else
				(void) fprintf(el->el_errfile,
				    "Error command = %d\n", cmdnum);
		}
#endif /* DEBUG_READ */
		retval = (*el->el_map.func[cmdnum]) (el, ch);

		/* save the last command here */
		el->el_state.lastcmd = cmdnum;

		/* use any return value */
		switch (retval) {
		case CC_CURSOR:
			el->el_state.argument = 1;
			el->el_state.doingarg = 0;
			re_refresh_cursor(el);
			break;

		case CC_REDISPLAY:
			re_clear_lines(el);
			re_clear_display(el);
			/* FALLTHROUGH */

		case CC_REFRESH:
			el->el_state.argument = 1;
			el->el_state.doingarg = 0;
			re_refresh(el);
			break;

		case CC_REFRESH_BEEP:
			el->el_state.argument = 1;
			el->el_state.doingarg = 0;
			re_refresh(el);
			term_beep(el);
			break;

		case CC_NORM:	/* normal char */
			el->el_state.argument = 1;
			el->el_state.doingarg = 0;
			break;

		case CC_ARGHACK:	/* Suggested by Rich Salz */
			/* <rsalz@pineapple.bbn.com> */
			break;	/* keep going... */

		case CC_EOF:	/* end of file typed */
			num = 0;
			break;

		case CC_NEWLINE:	/* normal end of line */
			num = el->el_line.lastchar - el->el_line.buffer;
			break;

		case CC_FATAL:	/* fatal error, reset to known state */
#ifdef DEBUG_READ
			(void) fprintf(el->el_errfile,
			    "*** editor fatal ERROR ***\r\n\n");
#endif /* DEBUG_READ */
			/* put (real) cursor in a known place */
			re_clear_display(el);	/* reset the display stuff */
			ch_reset(el);	/* reset the input pointers */
			re_refresh(el);	/* print the prompt again */
			el->el_state.argument = 1;
			el->el_state.doingarg = 0;
			break;

		case CC_ERROR:
		default:	/* functions we don't know about */
#ifdef DEBUG_READ
			(void) fprintf(el->el_errfile,
			    "*** editor ERROR ***\r\n\n");
#endif /* DEBUG_READ */
			el->el_state.argument = 1;
			el->el_state.doingarg = 0;
			term_beep(el);
			term__flush();
			break;
		}
	}

				/* make sure the tty is set up correctly */
	(void) tty_cookedmode(el);
	term__flush();		/* flush any buffered output */
	if (el->el_flags & HANDLE_SIGNALS)
		sig_clr(el);
	if (nread)
		*nread = num;
	return (num ? el->el_line.buffer : NULL);
}