File: mandoc.c

package info (click to toggle)
mdocml 1.14.4-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 9,096 kB
  • sloc: ansic: 34,421; makefile: 994; sh: 461; perl: 374
file content (633 lines) | stat: -rw-r--r-- 12,739 bytes parent folder | download
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
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
/*	$Id: mandoc.c,v 1.104 2018/07/28 18:34:15 schwarze Exp $ */
/*
 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011-2015, 2017, 2018 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "config.h"

#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "libmandoc.h"

static	int	 a2time(time_t *, const char *, const char *);
static	char	*time2a(time_t);


enum mandoc_esc
mandoc_escape(const char **end, const char **start, int *sz)
{
	const char	*local_start;
	int		 local_sz;
	char		 term;
	enum mandoc_esc	 gly;

	/*
	 * When the caller doesn't provide return storage,
	 * use local storage.
	 */

	if (NULL == start)
		start = &local_start;
	if (NULL == sz)
		sz = &local_sz;

	/*
	 * Beyond the backslash, at least one input character
	 * is part of the escape sequence.  With one exception
	 * (see below), that character won't be returned.
	 */

	gly = ESCAPE_ERROR;
	*start = ++*end;
	*sz = 0;
	term = '\0';

	switch ((*start)[-1]) {
	/*
	 * First the glyphs.  There are several different forms of
	 * these, but each eventually returns a substring of the glyph
	 * name.
	 */
	case '(':
		gly = ESCAPE_SPECIAL;
		*sz = 2;
		break;
	case '[':
		gly = ESCAPE_SPECIAL;
		term = ']';
		break;
	case 'C':
		if ('\'' != **start)
			return ESCAPE_ERROR;
		*start = ++*end;
		gly = ESCAPE_SPECIAL;
		term = '\'';
		break;

	/*
	 * Escapes taking no arguments at all.
	 */
	case 'd':
	case 'u':
	case ',':
	case '/':
		return ESCAPE_IGNORE;
	case 'p':
		return ESCAPE_BREAK;

	/*
	 * The \z escape is supposed to output the following
	 * character without advancing the cursor position.
	 * Since we are mostly dealing with terminal mode,
	 * let us just skip the next character.
	 */
	case 'z':
		return ESCAPE_SKIPCHAR;

	/*
	 * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
	 * 'X' is the trigger.  These have opaque sub-strings.
	 */
	case 'F':
	case 'g':
	case 'k':
	case 'M':
	case 'm':
	case 'n':
	case 'V':
	case 'Y':
		gly = ESCAPE_IGNORE;
		/* FALLTHROUGH */
	case 'f':
		if (ESCAPE_ERROR == gly)
			gly = ESCAPE_FONT;
		switch (**start) {
		case '(':
			*start = ++*end;
			*sz = 2;
			break;
		case '[':
			*start = ++*end;
			term = ']';
			break;
		default:
			*sz = 1;
			break;
		}
		break;

	/*
	 * These escapes are of the form \X'Y', where 'X' is the trigger
	 * and 'Y' is any string.  These have opaque sub-strings.
	 * The \B and \w escapes are handled in roff.c, roff_res().
	 */
	case 'A':
	case 'b':
	case 'D':
	case 'R':
	case 'X':
	case 'Z':
		gly = ESCAPE_IGNORE;
		/* FALLTHROUGH */
	case 'o':
		if (**start == '\0')
			return ESCAPE_ERROR;
		if (gly == ESCAPE_ERROR)
			gly = ESCAPE_OVERSTRIKE;
		term = **start;
		*start = ++*end;
		break;

	/*
	 * These escapes are of the form \X'N', where 'X' is the trigger
	 * and 'N' resolves to a numerical expression.
	 */
	case 'h':
	case 'H':
	case 'L':
	case 'l':
	case 'S':
	case 'v':
	case 'x':
		if (strchr(" %&()*+-./0123456789:<=>", **start)) {
			if ('\0' != **start)
				++*end;
			return ESCAPE_ERROR;
		}
		switch ((*start)[-1]) {
		case 'h':
			gly = ESCAPE_HORIZ;
			break;
		case 'l':
			gly = ESCAPE_HLINE;
			break;
		default:
			gly = ESCAPE_IGNORE;
			break;
		}
		term = **start;
		*start = ++*end;
		break;

	/*
	 * Special handling for the numbered character escape.
	 * XXX Do any other escapes need similar handling?
	 */
	case 'N':
		if ('\0' == **start)
			return ESCAPE_ERROR;
		(*end)++;
		if (isdigit((unsigned char)**start)) {
			*sz = 1;
			return ESCAPE_IGNORE;
		}
		(*start)++;
		while (isdigit((unsigned char)**end))
			(*end)++;
		*sz = *end - *start;
		if ('\0' != **end)
			(*end)++;
		return ESCAPE_NUMBERED;

	/*
	 * Sizes get a special category of their own.
	 */
	case 's':
		gly = ESCAPE_IGNORE;

		/* See +/- counts as a sign. */
		if ('+' == **end || '-' == **end || ASCII_HYPH == **end)
			*start = ++*end;

		switch (**end) {
		case '(':
			*start = ++*end;
			*sz = 2;
			break;
		case '[':
			*start = ++*end;
			term = ']';
			break;
		case '\'':
			*start = ++*end;
			term = '\'';
			break;
		case '3':
		case '2':
		case '1':
			*sz = (*end)[-1] == 's' &&
			    isdigit((unsigned char)(*end)[1]) ? 2 : 1;
			break;
		default:
			*sz = 1;
			break;
		}

		break;

	/*
	 * Anything else is assumed to be a glyph.
	 * In this case, pass back the character after the backslash.
	 */
	default:
		gly = ESCAPE_SPECIAL;
		*start = --*end;
		*sz = 1;
		break;
	}

	assert(ESCAPE_ERROR != gly);

	/*
	 * Read up to the terminating character,
	 * paying attention to nested escapes.
	 */

	if ('\0' != term) {
		while (**end != term) {
			switch (**end) {
			case '\0':
				return ESCAPE_ERROR;
			case '\\':
				(*end)++;
				if (ESCAPE_ERROR ==
				    mandoc_escape(end, NULL, NULL))
					return ESCAPE_ERROR;
				break;
			default:
				(*end)++;
				break;
			}
		}
		*sz = (*end)++ - *start;
	} else {
		assert(*sz > 0);
		if ((size_t)*sz > strlen(*start))
			return ESCAPE_ERROR;
		*end += *sz;
	}

	/* Run post-processors. */

	switch (gly) {
	case ESCAPE_FONT:
		if (2 == *sz) {
			if ('C' == **start) {
				/*
				 * Treat constant-width font modes
				 * just like regular font modes.
				 */
				(*start)++;
				(*sz)--;
			} else {
				if ('B' == (*start)[0] && 'I' == (*start)[1])
					gly = ESCAPE_FONTBI;
				break;
			}
		} else if (1 != *sz)
			break;

		switch (**start) {
		case '3':
		case 'B':
			gly = ESCAPE_FONTBOLD;
			break;
		case '2':
		case 'I':
			gly = ESCAPE_FONTITALIC;
			break;
		case 'P':
			gly = ESCAPE_FONTPREV;
			break;
		case '1':
		case 'R':
			gly = ESCAPE_FONTROMAN;
			break;
		}
		break;
	case ESCAPE_SPECIAL:
		if (1 == *sz && 'c' == **start)
			gly = ESCAPE_NOSPACE;
		/*
		 * Unicode escapes are defined in groff as \[u0000]
		 * to \[u10FFFF], where the contained value must be
		 * a valid Unicode codepoint.  Here, however, only
		 * check the length and range.
		 */
		if (**start != 'u' || *sz < 5 || *sz > 7)
			break;
		if (*sz == 7 && ((*start)[1] != '1' || (*start)[2] != '0'))
			break;
		if (*sz == 6 && (*start)[1] == '0')
			break;
		if (*sz == 5 && (*start)[1] == 'D' &&
		    strchr("89ABCDEF", (*start)[2]) != NULL)
			break;
		if ((int)strspn(*start + 1, "0123456789ABCDEFabcdef")
		    + 1 == *sz)
			gly = ESCAPE_UNICODE;
		break;
	default:
		break;
	}

	return gly;
}

/*
 * Parse a quoted or unquoted roff-style request or macro argument.
 * Return a pointer to the parsed argument, which is either the original
 * pointer or advanced by one byte in case the argument is quoted.
 * NUL-terminate the argument in place.
 * Collapse pairs of quotes inside quoted arguments.
 * Advance the argument pointer to the next argument,
 * or to the NUL byte terminating the argument line.
 */
char *
mandoc_getarg(struct mparse *parse, char **cpp, int ln, int *pos)
{
	char	 *start, *cp;
	int	  quoted, pairs, white;

	/* Quoting can only start with a new word. */
	start = *cpp;
	quoted = 0;
	if ('"' == *start) {
		quoted = 1;
		start++;
	}

	pairs = 0;
	white = 0;
	for (cp = start; '\0' != *cp; cp++) {

		/*
		 * Move the following text left
		 * after quoted quotes and after "\\" and "\t".
		 */
		if (pairs)
			cp[-pairs] = cp[0];

		if ('\\' == cp[0]) {
			/*
			 * In copy mode, translate double to single
			 * backslashes and backslash-t to literal tabs.
			 */
			switch (cp[1]) {
			case 't':
				cp[0] = '\t';
				/* FALLTHROUGH */
			case '\\':
				pairs++;
				cp++;
				break;
			case ' ':
				/* Skip escaped blanks. */
				if (0 == quoted)
					cp++;
				break;
			default:
				break;
			}
		} else if (0 == quoted) {
			if (' ' == cp[0]) {
				/* Unescaped blanks end unquoted args. */
				white = 1;
				break;
			}
		} else if ('"' == cp[0]) {
			if ('"' == cp[1]) {
				/* Quoted quotes collapse. */
				pairs++;
				cp++;
			} else {
				/* Unquoted quotes end quoted args. */
				quoted = 2;
				break;
			}
		}
	}

	/* Quoted argument without a closing quote. */
	if (1 == quoted)
		mandoc_msg(MANDOCERR_ARG_QUOTE, parse, ln, *pos, NULL);

	/* NUL-terminate this argument and move to the next one. */
	if (pairs)
		cp[-pairs] = '\0';
	if ('\0' != *cp) {
		*cp++ = '\0';
		while (' ' == *cp)
			cp++;
	}
	*pos += (int)(cp - start) + (quoted ? 1 : 0);
	*cpp = cp;

	if ('\0' == *cp && (white || ' ' == cp[-1]))
		mandoc_msg(MANDOCERR_SPACE_EOL, parse, ln, *pos, NULL);

	return start;
}

static int
a2time(time_t *t, const char *fmt, const char *p)
{
	struct tm	 tm;
	char		*pp;

	memset(&tm, 0, sizeof(struct tm));

	pp = NULL;
#if HAVE_STRPTIME
	pp = strptime(p, fmt, &tm);
#endif
	if (NULL != pp && '\0' == *pp) {
		*t = mktime(&tm);
		return 1;
	}

	return 0;
}

static char *
time2a(time_t t)
{
	struct tm	*tm;
	char		*buf, *p;
	size_t		 ssz;
	int		 isz;

	tm = localtime(&t);
	if (tm == NULL)
		return NULL;

	/*
	 * Reserve space:
	 * up to 9 characters for the month (September) + blank
	 * up to 2 characters for the day + comma + blank
	 * 4 characters for the year and a terminating '\0'
	 */

	p = buf = mandoc_malloc(10 + 4 + 4 + 1);

	if ((ssz = strftime(p, 10 + 1, "%B ", tm)) == 0)
		goto fail;
	p += (int)ssz;

	/*
	 * The output format is just "%d" here, not "%2d" or "%02d".
	 * That's also the reason why we can't just format the
	 * date as a whole with "%B %e, %Y" or "%B %d, %Y".
	 * Besides, the present approach is less prone to buffer
	 * overflows, in case anybody should ever introduce the bug
	 * of looking at LC_TIME.
	 */

	if ((isz = snprintf(p, 4 + 1, "%d, ", tm->tm_mday)) == -1)
		goto fail;
	p += isz;

	if (strftime(p, 4 + 1, "%Y", tm) == 0)
		goto fail;
	return buf;

fail:
	free(buf);
	return NULL;
}

char *
mandoc_normdate(struct roff_man *man, char *in, int ln, int pos)
{
	char		*cp;
	time_t		 t;

	/* No date specified: use today's date. */

	if (in == NULL || *in == '\0' || strcmp(in, "$" "Mdocdate$") == 0) {
		mandoc_msg(MANDOCERR_DATE_MISSING, man->parse, ln, pos, NULL);
		return time2a(time(NULL));
	}

	/* Valid mdoc(7) date format. */

	if (a2time(&t, "$" "Mdocdate: %b %d %Y $", in) ||
	    a2time(&t, "%b %d, %Y", in)) {
		cp = time2a(t);
		if (t > time(NULL) + 86400)
			mandoc_msg(MANDOCERR_DATE_FUTURE, man->parse,
			    ln, pos, cp);
		else if (*in != '$' && strcmp(in, cp) != 0)
			mandoc_msg(MANDOCERR_DATE_NORM, man->parse,
			    ln, pos, cp);
		return cp;
	}

	/* In man(7), do not warn about the legacy format. */

	if (a2time(&t, "%Y-%m-%d", in) == 0)
		mandoc_msg(MANDOCERR_DATE_BAD, man->parse, ln, pos, in);
	else if (t > time(NULL) + 86400)
		mandoc_msg(MANDOCERR_DATE_FUTURE, man->parse, ln, pos, in);
	else if (man->macroset == MACROSET_MDOC)
		mandoc_vmsg(MANDOCERR_DATE_LEGACY, man->parse,
		    ln, pos, "Dd %s", in);

	/* Use any non-mdoc(7) date verbatim. */

	return mandoc_strdup(in);
}

int
mandoc_eos(const char *p, size_t sz)
{
	const char	*q;
	int		 enclosed, found;

	if (0 == sz)
		return 0;

	/*
	 * End-of-sentence recognition must include situations where
	 * some symbols, such as `)', allow prior EOS punctuation to
	 * propagate outward.
	 */

	enclosed = found = 0;
	for (q = p + (int)sz - 1; q >= p; q--) {
		switch (*q) {
		case '\"':
		case '\'':
		case ']':
		case ')':
			if (0 == found)
				enclosed = 1;
			break;
		case '.':
		case '!':
		case '?':
			found = 1;
			break;
		default:
			return found &&
			    (!enclosed || isalnum((unsigned char)*q));
		}
	}

	return found && !enclosed;
}

/*
 * Convert a string to a long that may not be <0.
 * If the string is invalid, or is less than 0, return -1.
 */
int
mandoc_strntoi(const char *p, size_t sz, int base)
{
	char		 buf[32];
	char		*ep;
	long		 v;

	if (sz > 31)
		return -1;

	memcpy(buf, p, sz);
	buf[(int)sz] = '\0';

	errno = 0;
	v = strtol(buf, &ep, base);

	if (buf[0] == '\0' || *ep != '\0')
		return -1;

	if (v > INT_MAX)
		v = INT_MAX;
	if (v < INT_MIN)
		v = INT_MIN;

	return (int)v;
}