GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/time/wcsftime.c Lines: 0 189 0.0 %
Date: 2017-11-13 Branches: 0 143 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: wcsftime.c,v 1.6 2015/02/09 14:52:28 tedu Exp $ */
2
/*
3
** Based on the UCB version with the ID appearing below.
4
** This is ANSIish only when "multibyte character == plain character".
5
**
6
** Copyright (c) 1989, 1993
7
**	The Regents of the University of California.  All rights reserved.
8
**
9
** Redistribution and use in source and binary forms, with or without
10
** modification, are permitted provided that the following conditions
11
** are met:
12
** 1. Redistributions of source code must retain the above copyright
13
**    notice, this list of conditions and the following disclaimer.
14
** 2. Redistributions in binary form must reproduce the above copyright
15
**    notice, this list of conditions and the following disclaimer in the
16
**    documentation and/or other materials provided with the distribution.
17
** 3. Neither the name of the University nor the names of its contributors
18
**    may be used to endorse or promote products derived from this software
19
**    without specific prior written permission.
20
**
21
** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24
** ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31
** SUCH DAMAGE.
32
*/
33
34
#include <fcntl.h>
35
#include <locale.h>
36
#include <wchar.h>
37
38
#include "private.h"
39
#include "tzfile.h"
40
41
struct lc_time_T {
42
	const wchar_t *	mon[MONSPERYEAR];
43
	const wchar_t *	month[MONSPERYEAR];
44
	const wchar_t *	wday[DAYSPERWEEK];
45
	const wchar_t *	weekday[DAYSPERWEEK];
46
	const wchar_t *	X_fmt;
47
	const wchar_t *	x_fmt;
48
	const wchar_t *	c_fmt;
49
	const wchar_t *	am;
50
	const wchar_t *	pm;
51
	const wchar_t *	date_fmt;
52
};
53
54
#define Locale	(&C_time_locale)
55
56
static const struct lc_time_T	C_time_locale = {
57
	{
58
		L"Jan", L"Feb", L"Mar", L"Apr", L"May", L"Jun",
59
		L"Jul", L"Aug", L"Sep", L"Oct", L"Nov", L"Dec"
60
	}, {
61
		L"January", L"February", L"March", L"April", L"May", L"June",
62
		L"July", L"August", L"September", L"October", L"November",
63
		L"December"
64
	}, {
65
		L"Sun", L"Mon", L"Tue", L"Wed",
66
		L"Thu", L"Fri", L"Sat"
67
	}, {
68
		L"Sunday", L"Monday", L"Tuesday", L"Wednesday",
69
		L"Thursday", L"Friday", L"Saturday"
70
	},
71
72
	/* X_fmt */
73
	L"%H:%M:%S",
74
75
	/*
76
	** x_fmt
77
	** C99 requires this format.
78
	** Using just numbers (as here) makes Quakers happier;
79
	** it's also compatible with SVR4.
80
	*/
81
	L"%m/%d/%y",
82
83
	/*
84
	** c_fmt
85
	** C99 requires this format.
86
	** Previously this code used "%D %X", but we now conform to C99.
87
	** Note that
88
	**	"%a %b %d %H:%M:%S %Y"
89
	** is used by Solaris 2.3.
90
	*/
91
	L"%a %b %e %T %Y",
92
93
	/* am */
94
	L"AM",
95
96
	/* pm */
97
	L"PM",
98
99
	/* date_fmt */
100
	L"%a %b %e %H:%M:%S %Z %Y"
101
};
102
103
#define UNKNOWN L"?"
104
static wchar_t *	_add(const wchar_t *, wchar_t *, const wchar_t *);
105
static wchar_t *	_sadd(const char *, wchar_t *, const wchar_t *);
106
static wchar_t *	_conv(int, const wchar_t *, wchar_t *, const wchar_t *);
107
static wchar_t *	_fmt(const wchar_t *, const struct tm *, wchar_t *, const wchar_t *,
108
			int *);
109
static wchar_t *	_yconv(int, int, int, int, wchar_t *, const wchar_t *);
110
111
extern char *	tzname[];
112
113
#define IN_NONE	0
114
#define IN_SOME	1
115
#define IN_THIS	2
116
#define IN_ALL	3
117
118
size_t
119
wcsftime(wchar_t *__restrict s, size_t maxsize,
120
    const wchar_t *__restrict format, const struct tm *__restrict t)
121
{
122
	wchar_t *p;
123
	int	warn;
124
125
	tzset();
126
	warn = IN_NONE;
127
	p = _fmt(((format == NULL) ? L"%c" : format), t, s, s + maxsize, &warn);
128
	if (p == s + maxsize) {
129
		if (maxsize > 0)
130
			s[maxsize - 1] = '\0';
131
		return 0;
132
	}
133
	*p = L'\0';
134
	return p - s;
135
}
136
137
static wchar_t *
138
_fmt(const wchar_t *format, const struct tm *t, wchar_t *pt,
139
    const wchar_t *ptlim, int *warnp)
140
{
141
	for ( ; *format; ++format) {
142
		if (*format != L'%') {
143
			if (pt == ptlim)
144
				break;
145
			*pt++ = *format;
146
			continue;
147
		}
148
label:
149
		switch (*++format) {
150
		case '\0':
151
			--format;
152
			break;
153
		case 'A':
154
			pt = _add((t->tm_wday < 0 ||
155
				t->tm_wday >= DAYSPERWEEK) ?
156
				UNKNOWN : Locale->weekday[t->tm_wday],
157
				pt, ptlim);
158
			continue;
159
		case 'a':
160
			pt = _add((t->tm_wday < 0 ||
161
				t->tm_wday >= DAYSPERWEEK) ?
162
				UNKNOWN : Locale->wday[t->tm_wday],
163
				pt, ptlim);
164
			continue;
165
		case 'B':
166
			pt = _add((t->tm_mon < 0 ||
167
				t->tm_mon >= MONSPERYEAR) ?
168
				UNKNOWN : Locale->month[t->tm_mon],
169
				pt, ptlim);
170
			continue;
171
		case 'b':
172
		case 'h':
173
			pt = _add((t->tm_mon < 0 ||
174
				t->tm_mon >= MONSPERYEAR) ?
175
				UNKNOWN : Locale->mon[t->tm_mon],
176
				pt, ptlim);
177
			continue;
178
		case 'C':
179
			/*
180
			** %C used to do a...
181
			**	_fmt("%a %b %e %X %Y", t);
182
			** ...whereas now POSIX 1003.2 calls for
183
			** something completely different.
184
			** (ado, 1993-05-24)
185
			*/
186
			pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
187
				pt, ptlim);
188
			continue;
189
		case 'c':
190
			{
191
			int warn2 = IN_SOME;
192
193
			pt = _fmt(Locale->c_fmt, t, pt, ptlim, &warn2);
194
			if (warn2 == IN_ALL)
195
				warn2 = IN_THIS;
196
			if (warn2 > *warnp)
197
				*warnp = warn2;
198
			}
199
			continue;
200
		case 'D':
201
			pt = _fmt(L"%m/%d/%y", t, pt, ptlim, warnp);
202
			continue;
203
		case 'd':
204
			pt = _conv(t->tm_mday, L"%02d", pt, ptlim);
205
			continue;
206
		case 'E':
207
		case 'O':
208
			/*
209
			** C99 locale modifiers.
210
			** The sequences
211
			**	%Ec %EC %Ex %EX %Ey %EY
212
			**	%Od %oe %OH %OI %Om %OM
213
			**	%OS %Ou %OU %OV %Ow %OW %Oy
214
			** are supposed to provide alternate
215
			** representations.
216
			*/
217
			goto label;
218
		case 'e':
219
			pt = _conv(t->tm_mday, L"%2d", pt, ptlim);
220
			continue;
221
		case 'F':
222
			pt = _fmt(L"%Y-%m-%d", t, pt, ptlim, warnp);
223
			continue;
224
		case 'H':
225
			pt = _conv(t->tm_hour, L"%02d", pt, ptlim);
226
			continue;
227
		case 'I':
228
			pt = _conv((t->tm_hour % 12) ?
229
				(t->tm_hour % 12) : 12,
230
				L"%02d", pt, ptlim);
231
			continue;
232
		case 'j':
233
			pt = _conv(t->tm_yday + 1, L"%03d", pt, ptlim);
234
			continue;
235
		case 'k':
236
			/*
237
			** This used to be...
238
			**	_conv(t->tm_hour % 12 ?
239
			**		t->tm_hour % 12 : 12, 2, ' ');
240
			** ...and has been changed to the below to
241
			** match SunOS 4.1.1 and Arnold Robbins'
242
			** strftime version 3.0. That is, "%k" and
243
			** "%l" have been swapped.
244
			** (ado, 1993-05-24)
245
			*/
246
			pt = _conv(t->tm_hour, L"%2d", pt, ptlim);
247
			continue;
248
		case 'l':
249
			/*
250
			** This used to be...
251
			**	_conv(t->tm_hour, 2, ' ');
252
			** ...and has been changed to the below to
253
			** match SunOS 4.1.1 and Arnold Robbin's
254
			** strftime version 3.0. That is, "%k" and
255
			** "%l" have been swapped.
256
			** (ado, 1993-05-24)
257
			*/
258
			pt = _conv((t->tm_hour % 12) ?
259
				(t->tm_hour % 12) : 12,
260
				L"%2d", pt, ptlim);
261
			continue;
262
		case 'M':
263
			pt = _conv(t->tm_min, L"%02d", pt, ptlim);
264
			continue;
265
		case 'm':
266
			pt = _conv(t->tm_mon + 1, L"%02d", pt, ptlim);
267
			continue;
268
		case 'n':
269
			pt = _add(L"\n", pt, ptlim);
270
			continue;
271
		case 'p':
272
			pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
273
				Locale->pm :
274
				Locale->am,
275
				pt, ptlim);
276
			continue;
277
		case 'R':
278
			pt = _fmt(L"%H:%M", t, pt, ptlim, warnp);
279
			continue;
280
		case 'r':
281
			pt = _fmt(L"%I:%M:%S %p", t, pt, ptlim, warnp);
282
			continue;
283
		case 'S':
284
			pt = _conv(t->tm_sec, L"%02d", pt, ptlim);
285
			continue;
286
		case 's':
287
			{
288
				struct tm	tm;
289
				wchar_t		buf[INT_STRLEN_MAXIMUM(
290
							time_t) + 1];
291
				time_t		mkt;
292
293
				tm = *t;
294
				mkt = mktime(&tm);
295
				(void) swprintf(buf,
296
				    sizeof buf/sizeof buf[0],
297
				    L"%ld", (long) mkt);
298
				pt = _add(buf, pt, ptlim);
299
			}
300
			continue;
301
		case 'T':
302
			pt = _fmt(L"%H:%M:%S", t, pt, ptlim, warnp);
303
			continue;
304
		case 't':
305
			pt = _add(L"\t", pt, ptlim);
306
			continue;
307
		case 'U':
308
			pt = _conv((t->tm_yday + DAYSPERWEEK -
309
				t->tm_wday) / DAYSPERWEEK,
310
				L"%02d", pt, ptlim);
311
			continue;
312
		case 'u':
313
			/*
314
			** From Arnold Robbins' strftime version 3.0:
315
			** "ISO 8601: Weekday as a decimal number
316
			** [1 (Monday) - 7]"
317
			** (ado, 1993-05-24)
318
			*/
319
			pt = _conv((t->tm_wday == 0) ?
320
				DAYSPERWEEK : t->tm_wday,
321
				L"%d", pt, ptlim);
322
			continue;
323
		case 'V':	/* ISO 8601 week number */
324
		case 'G':	/* ISO 8601 year (four digits) */
325
		case 'g':	/* ISO 8601 year (two digits) */
326
/*
327
** From Arnold Robbins' strftime version 3.0: "the week number of the
328
** year (the first Monday as the first day of week 1) as a decimal number
329
** (01-53)."
330
** (ado, 1993-05-24)
331
**
332
** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
333
** "Week 01 of a year is per definition the first week which has the
334
** Thursday in this year, which is equivalent to the week which contains
335
** the fourth day of January. In other words, the first week of a new year
336
** is the week which has the majority of its days in the new year. Week 01
337
** might also contain days from the previous year and the week before week
338
** 01 of a year is the last week (52 or 53) of the previous year even if
339
** it contains days from the new year. A week starts with Monday (day 1)
340
** and ends with Sunday (day 7). For example, the first week of the year
341
** 1997 lasts from 1996-12-30 to 1997-01-05..."
342
** (ado, 1996-01-02)
343
*/
344
			{
345
			int	year;
346
			int	base;
347
			int	yday;
348
			int	wday;
349
			int	w;
350
351
			year = t->tm_year;
352
			base = TM_YEAR_BASE;
353
			yday = t->tm_yday;
354
			wday = t->tm_wday;
355
			for ( ; ; ) {
356
				int	len;
357
				int	bot;
358
				int	top;
359
360
				len = isleap_sum(year, base) ?
361
					DAYSPERLYEAR :
362
					DAYSPERNYEAR;
363
				/*
364
				** What yday (-3 ... 3) does the ISO year
365
				** begin on?
366
				*/
367
				bot = ((yday + 11 - wday) % DAYSPERWEEK) - 3;
368
				/*
369
				** What yday does the NEXT ISO year begin on?
370
				*/
371
				top = bot - (len % DAYSPERWEEK);
372
				if (top < -3)
373
					top += DAYSPERWEEK;
374
				top += len;
375
				if (yday >= top) {
376
					++base;
377
					w = 1;
378
					break;
379
				}
380
				if (yday >= bot) {
381
					w = 1 + ((yday - bot) / DAYSPERWEEK);
382
					break;
383
				}
384
				--base;
385
				yday += isleap_sum(year, base) ?
386
					DAYSPERLYEAR :
387
					DAYSPERNYEAR;
388
			}
389
			if ((w == 52 && t->tm_mon == TM_JANUARY) ||
390
				(w == 1 && t->tm_mon == TM_DECEMBER))
391
					w = 53;
392
			if (*format == 'V')
393
				pt = _conv(w, L"%02d", pt, ptlim);
394
			else if (*format == 'g') {
395
				*warnp = IN_ALL;
396
				pt = _yconv(year, base, 0, 1, pt, ptlim);
397
			} else
398
				pt = _yconv(year, base, 1, 1, pt, ptlim);
399
			}
400
			continue;
401
		case 'v':
402
			/*
403
			** From Arnold Robbins' strftime version 3.0:
404
			** "date as dd-bbb-YYYY"
405
			** (ado, 1993-05-24)
406
			*/
407
			pt = _fmt(L"%e-%b-%Y", t, pt, ptlim, warnp);
408
			continue;
409
		case 'W':
410
			pt = _conv((t->tm_yday + DAYSPERWEEK -
411
				(t->tm_wday ?
412
				(t->tm_wday - 1) :
413
				(DAYSPERWEEK - 1))) / DAYSPERWEEK,
414
				L"%02d", pt, ptlim);
415
			continue;
416
		case 'w':
417
			pt = _conv(t->tm_wday, L"%d", pt, ptlim);
418
			continue;
419
		case 'X':
420
			pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp);
421
			continue;
422
		case 'x':
423
			{
424
			int	warn2 = IN_SOME;
425
426
			pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
427
			if (warn2 == IN_ALL)
428
				warn2 = IN_THIS;
429
			if (warn2 > *warnp)
430
				*warnp = warn2;
431
			}
432
			continue;
433
		case 'y':
434
			*warnp = IN_ALL;
435
			pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, pt, ptlim);
436
			continue;
437
		case 'Y':
438
			pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, pt, ptlim);
439
			continue;
440
		case 'Z':
441
			if (t->tm_zone != NULL)
442
				pt = _sadd(t->TM_ZONE, pt, ptlim);
443
			else
444
				if (t->tm_isdst >= 0)
445
					pt = _sadd(tzname[t->tm_isdst != 0],
446
					    pt, ptlim);
447
			/*
448
			** C99 says that %Z must be replaced by the
449
			** empty string if the time zone is not
450
			** determinable.
451
			*/
452
			continue;
453
		case 'z':
454
			{
455
			int		diff;
456
			wchar_t const *	sign;
457
458
			if (t->tm_isdst < 0)
459
				continue;
460
			diff = t->tm_gmtoff;
461
			if (diff < 0) {
462
				sign = L"-";
463
				diff = -diff;
464
			} else
465
				sign = L"+";
466
			pt = _add(sign, pt, ptlim);
467
			diff /= SECSPERMIN;
468
			diff = (diff / MINSPERHOUR) * 100 +
469
				(diff % MINSPERHOUR);
470
			pt = _conv(diff, L"%04d", pt, ptlim);
471
			}
472
			continue;
473
		case '+':
474
			pt = _fmt(Locale->date_fmt, t, pt, ptlim, warnp);
475
			continue;
476
		case '%':
477
		/*
478
		** X311J/88-090 (4.12.3.5): if conversion wchar_t is
479
		** undefined, behavior is undefined. Print out the
480
		** character itself as printf(3) also does.
481
		*/
482
		default:
483
			if (pt != ptlim)
484
				*pt++ = *format;
485
			break;
486
		}
487
	}
488
	return pt;
489
}
490
491
static wchar_t *
492
_conv(int n, const wchar_t *format, wchar_t *pt, const wchar_t *ptlim)
493
{
494
	wchar_t	buf[INT_STRLEN_MAXIMUM(int) + 1];
495
496
	(void) swprintf(buf, sizeof buf/sizeof buf[0], format, n);
497
	return _add(buf, pt, ptlim);
498
}
499
500
static wchar_t *
501
_add(const wchar_t *str, wchar_t *pt, const wchar_t *ptlim)
502
{
503
	while (pt < ptlim && (*pt = *str++) != L'\0')
504
		++pt;
505
	return pt;
506
}
507
508
static wchar_t *
509
_sadd(const char *str, wchar_t *pt, const wchar_t *ptlim)
510
{
511
	while (pt < ptlim && (*pt = btowc(*str++)) != L'\0')
512
		++pt;
513
	return pt;
514
}
515
/*
516
** POSIX and the C Standard are unclear or inconsistent about
517
** what %C and %y do if the year is negative or exceeds 9999.
518
** Use the convention that %C concatenated with %y yields the
519
** same output as %Y, and that %Y contains at least 4 bytes,
520
** with more only if necessary.
521
*/
522
523
static wchar_t *
524
_yconv(int a, int b, int convert_top, int convert_yy, wchar_t *pt,
525
    const wchar_t *ptlim)
526
{
527
	int	lead;
528
	int	trail;
529
530
#define DIVISOR	100
531
	trail = a % DIVISOR + b % DIVISOR;
532
	lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
533
	trail %= DIVISOR;
534
	if (trail < 0 && lead > 0) {
535
		trail += DIVISOR;
536
		--lead;
537
	} else if (lead < 0 && trail > 0) {
538
		trail -= DIVISOR;
539
		++lead;
540
	}
541
	if (convert_top) {
542
		if (lead == 0 && trail < 0)
543
			pt = _add(L"-0", pt, ptlim);
544
		else	pt = _conv(lead, L"%02d", pt, ptlim);
545
	}
546
	if (convert_yy)
547
		pt = _conv(((trail < 0) ? -trail : trail), L"%02d", pt, ptlim);
548
	return pt;
549
}
550