strptime.c@ 51

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Last change on this file since 51 was 44, checked in by Nishi, on Sep 18, 2024 at 6:37:09 PM
fix strptime
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1	/* $NetBSD: strptime.c,v 1.62 2017/08/24 01:01:09 ginsbach Exp $ */
2	/* http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/lib/libc/time/strptime.c?only_with_tag=HEAD
3	* NetBSD implementation strptime().
4	* Format description: https://netbsd.gw.com/cgi-bin/man-cgi?strptime+3+NetBSD-current
5	*/
6	/*-
7	* Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
8	* All rights reserved.
9	*
10	* This code was contributed to The NetBSD Foundation by Klaus Klein.
11	* Heavily optimised by David Laight
12	*
13	* Redistribution and use in source and binary forms, with or without
14	* modification, are permitted provided that the following conditions
15	* are met:
16	* 1. Redistributions of source code must retain the above copyright
17	* notice, this list of conditions and the following disclaimer.
18	* 2. Redistributions in binary form must reproduce the above copyright
19	* notice, this list of conditions and the following disclaimer in the
20	* documentation and/or other materials provided with the distribution.
21	*
22	* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24	* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32	* POSSIBILITY OF SUCH DAMAGE.
33	*/
34
35	//#include <sys/cdefs.h>
36	//__RCSID("$NetBSD: strptime.c,v 1.62 2017/08/24 01:01:09 ginsbach Exp $");
37
38	#ifdef __MINGW32__
39
40	#include <ctype.h>
41	#include <string.h>
42	#include <time.h>
43	#include <stdint.h>
44
45	static const unsigned char conv_num(const unsigned char , int *, unsigned int, unsigned int);
46	static const unsigned char find_string(const unsigned char , int , const char const , const char const *, int);
47
48	/*
49	* We do not implement alternate representations. However, we always
50	* check whether a given modifier is allowed for a certain conversion.
51	*/
52	#define ALT_E 0x01
53	#define ALT_O 0x02
54	#define LEGAL_ALT(x) { if (alt_format & ~(x)) return NULL; }
55
56	#define TM_YEAR_BASE 1900
57
58	#define TM_SUNDAY 0
59	#define TM_MONDAY 1
60	#define TM_TUESDAY 2
61	#define TM_WEDNESDAY 3
62	#define TM_THURSDAY 4
63	#define TM_FRIDAY 5
64	#define TM_SATURDAY 6
65
66	#define S_YEAR (1 << 0)
67	#define S_MON (1 << 1)
68	#define S_YDAY (1 << 2)
69	#define S_MDAY (1 << 3)
70	#define S_WDAY (1 << 4)
71	#define S_HOUR (1 << 5)
72
73	#define HAVE_MDAY(s) (s & S_MDAY)
74	#define HAVE_MON(s) (s & S_MON)
75	#define HAVE_WDAY(s) (s & S_WDAY)
76	#define HAVE_YDAY(s) (s & S_YDAY)
77	#define HAVE_YEAR(s) (s & S_YEAR)
78	#define HAVE_HOUR(s) (s & S_HOUR)
79
80	#define SECSPERMIN 60
81	#define MINSPERHOUR 60
82	#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
83	#define HOURSPERDAY 24
84
85	#define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
86	#define HERE_D_FMT "%y/%m/%d"
87	#define HERE_T_FMT_AMPM "%I:%M:%S %p"
88	#define HERE_T_FMT "%H:%M:%S"
89
90	#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 \|\| ((y) % 400) == 0))
91
92	/*
93	** Since everything in isleap is modulo 400 (or a factor of 400), we know that
94	** isleap(y) == isleap(y % 400)
95	** and so
96	** isleap(a + b) == isleap((a + b) % 400)
97	** or
98	** isleap(a + b) == isleap(a % 400 + b % 400)
99	** This is true even if % means modulo rather than Fortran remainder
100	** (which is allowed by C89 but not by C99 or later).
101	** We use this to avoid addition overflow problems.
102	*/
103
104	#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
105
106	#ifdef _MSC_VER
107	#define tzname _tzname
108	#define strncasecmp _strnicmp
109	#endif
110
111	#ifdef TM_ZONE
112	static char* utc = "UTC";
113	#endif
114	/* RFC-822/RFC-2822 */
115	static const char* const nast[] = {
116	"EST", "CST", "MST", "PST", "\0\0\0"
117	};
118	static const char* const nadt[] = {
119	"EDT", "CDT", "MDT", "PDT", "\0\0\0"
120	};
121	static const char* weekday_name[] =
122	{
123	"Sunday", "Monday", "Tuesday", "Wednesday",
124	"Thursday", "Friday", "Saturday"
125	};
126	static const char* ab_weekday_name[] =
127	{
128	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
129	};
130	static const char* month_name[] =
131	{
132	"January", "February", "March", "April", "May", "June",
133	"July", "August", "September", "October", "November", "December"
134	};
135	static const char* ab_month_name[] =
136	{
137	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
138	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
139	};
140	static const char* am_pm[] = {"AM", "PM"};
141
142
143	/*
144	* Table to determine the ordinal date for the start of a month.
145	* Ref: http://en.wikipedia.org/wiki/ISO_week_date
146	*/
147	static const int start_of_month[2][13] = {
148	/* non-leap year */
149	{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
150	/* leap year */
151	{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
152	};
153
154	/*
155	* Calculate the week day of the first day of a year. Valid for
156	* the Gregorian calendar, which began Sept 14, 1752 in the UK
157	* and its colonies. Ref:
158	* http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
159	*/
160
161	static int
162	first_wday_of(int yr)
163	{
164	return ((2 * (3 - (yr / 100) % 4)) + (yr % 100) + ((yr % 100) / 4) +
165	(isleap(yr) ? 6 : 0) + 1) % 7;
166	}
167
168	#define delim(p) ((p) == '\0' \|\| isspace((unsigned char)(p)))
169
170	static int
171	fromzone(const unsigned char *bp, struct tm tm, int mandatory)
172	{
173	// timezone_t tz;
174	char buf[512], *p;
175	const unsigned char *rp;
176
177	for (p = buf, rp = bp; !delim(rp) && p < &buf[sizeof(buf) - 1]; rp++)
178	p++ = rp;
179	*p = '\0';
180
181	if (mandatory)
182	*bp = rp;
183	if (!isalnum((unsigned char)*buf))
184	return 0;
185	// tz = tzalloc(buf);
186	// if (tz == NULL)
187	// return 0;
188
189	*bp = rp;
190	tm->tm_isdst = 0; /* XXX */
191	#ifdef TM_GMTOFF
192	tm->TM_GMTOFF = tzgetgmtoff(tz, tm->tm_isdst);
193	#endif
194	#ifdef TM_ZONE
195	// Can't use tzgetname() here because we are going to free()
196	tm->TM_ZONE = NULL; /* XXX */
197	#endif
198	// tzfree(tz);
199	return 1;
200	}
201
202	char* strptime(const char buf, const char fmt, struct tm *tm)
203	{
204	unsigned char c;
205	const unsigned char bp, ep, *zname;
206	int alt_format, i, split_year = 0, neg = 0, state = 0,
207	day_offset = -1, week_offset = 0, offs, mandatory;
208	const char *new_fmt;
209
210	bp = (const unsigned char *)buf;
211
212	while (bp != NULL && (c = *fmt++) != '\0') {
213	/* Clear `alternate' modifier prior to new conversion. */
214	alt_format = 0;
215	i = 0;
216
217	/* Eat up white-space. */
218	if (isspace(c)) {
219	while (isspace(*bp))
220	bp++;
221	continue;
222	}
223
224	if (c != '%')
225	goto literal;
226
227
228	again: switch (c = *fmt++) {
229	case '%': /* "%%" is converted to "%". */
230	literal:
231	if (c != *bp++)
232	return NULL;
233	LEGAL_ALT(0);
234	continue;
235
236	/*
237	* "Alternative" modifiers. Just set the appropriate flag
238	* and start over again.
239	*/
240	case 'E': /* "%E?" alternative conversion modifier. */
241	LEGAL_ALT(0);
242	alt_format \|= ALT_E;
243	goto again;
244
245	case 'O': /* "%O?" alternative conversion modifier. */
246	LEGAL_ALT(0);
247	alt_format \|= ALT_O;
248	goto again;
249
250	/*
251	* "Complex" conversion rules, implemented through recursion.
252	*/
253	case 'c': /* Date and time, using the locale's format. */
254	// new_fmt = _TIME_LOCALE(loc)->d_t_fmt;
255	new_fmt = HERE_D_T_FMT;
256	state \|= S_WDAY \| S_MON \| S_MDAY \| S_YEAR;
257	goto recurse;
258
259	case 'F': /* The date as "%Y-%m-%d". */
260	new_fmt = "%Y-%m-%d";
261	LEGAL_ALT(0);
262	state \|= S_MON \| S_MDAY \| S_YEAR;
263	goto recurse;
264
265	case 'R': /* The time as "%H:%M". */
266	new_fmt = "%H:%M";
267	LEGAL_ALT(0);
268	goto recurse;
269
270	case 'r': /* The time in 12-hour clock representation. */
271	// new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm;
272	new_fmt = HERE_T_FMT_AMPM;
273	LEGAL_ALT(0);
274	goto recurse;
275
276	case 'X': /* The time, using the locale's format. */
277	/* fall through */
278
279	case 'T': /* The time as "%H:%M:%S". */
280	new_fmt = HERE_T_FMT;
281	LEGAL_ALT(0);
282
283	recurse:
284	bp = (const unsigned char )strptime((const char )bp,
285	new_fmt, tm);
286	LEGAL_ALT(ALT_E);
287	continue;
288
289	case 'x': /* The date, using the locale's format. */
290	/* fall throug */
291
292	case 'D': /* The date as "%y/%m/%d". */
293	{
294	new_fmt = HERE_D_FMT;
295	LEGAL_ALT(0);
296	state \|= S_MON \| S_MDAY \| S_YEAR;
297	const int year = split_year ? tm->tm_year : 0;
298
299	bp = (const unsigned char )strptime((const char )bp,
300	new_fmt, tm);
301	LEGAL_ALT(ALT_E);
302	tm->tm_year += year;
303	if (split_year && tm->tm_year % (2000 - TM_YEAR_BASE) <= 68)
304	tm->tm_year -= 2000 - TM_YEAR_BASE;
305	split_year = 1;
306	continue;
307	}
308	/*
309	* "Elementary" conversion rules.
310	*/
311	case 'A': /* The day of week, using the locale's form. */
312	case 'a':
313	bp = find_string(bp, &tm->tm_wday, weekday_name, ab_weekday_name, 7);
314	LEGAL_ALT(0);
315	state \|= S_WDAY;
316	continue;
317
318	case 'B': /* The month, using the locale's form. */
319	case 'b':
320	case 'h':
321	bp = find_string(bp, &tm->tm_mon, month_name, ab_month_name, 12);
322	LEGAL_ALT(0);
323	state \|= S_MON;
324	continue;
325
326	case 'C': /* The century number. */
327	i = 20;
328	bp = conv_num(bp, &i, 0, 99);
329
330	i = i * 100 - TM_YEAR_BASE;
331	if (split_year)
332	i += tm->tm_year % 100;
333	split_year = 1;
334	tm->tm_year = i;
335	LEGAL_ALT(ALT_E);
336	state \|= S_YEAR;
337	continue;
338
339	case 'd': /* The day of month. */
340	case 'e':
341	bp = conv_num(bp, &tm->tm_mday, 1, 31);
342	LEGAL_ALT(ALT_O);
343	state \|= S_MDAY;
344	continue;
345
346	case 'k': /* The hour (24-hour clock representation). */
347	LEGAL_ALT(0);
348	/* FALLTHROUGH */
349	case 'H':
350	bp = conv_num(bp, &tm->tm_hour, 0, 23);
351	LEGAL_ALT(ALT_O);
352	state \|= S_HOUR;
353	continue;
354
355	case 'l': /* The hour (12-hour clock representation). */
356	LEGAL_ALT(0);
357	/* FALLTHROUGH */
358	case 'I':
359	bp = conv_num(bp, &tm->tm_hour, 1, 12);
360	if (tm->tm_hour == 12)
361	tm->tm_hour = 0;
362	LEGAL_ALT(ALT_O);
363	state \|= S_HOUR;
364	continue;
365
366	case 'j': /* The day of year. */
367	i = 1;
368	bp = conv_num(bp, &i, 1, 366);
369	tm->tm_yday = i - 1;
370	LEGAL_ALT(0);
371	state \|= S_YDAY;
372	continue;
373
374	case 'M': /* The minute. */
375	bp = conv_num(bp, &tm->tm_min, 0, 59);
376	LEGAL_ALT(ALT_O);
377	continue;
378
379	case 'm': /* The month. */
380	i = 1;
381	bp = conv_num(bp, &i, 1, 12);
382	tm->tm_mon = i - 1;
383	LEGAL_ALT(ALT_O);
384	state \|= S_MON;
385	continue;
386
387	case 'p': /* The locale's equivalent of AM/PM. */
388	bp = find_string(bp, &i, am_pm, NULL, 2);
389	if (HAVE_HOUR(state) && tm->tm_hour > 11)
390	return NULL;
391	tm->tm_hour += i * 12;
392	LEGAL_ALT(0);
393	continue;
394
395	case 'S': /* The seconds. */
396	bp = conv_num(bp, &tm->tm_sec, 0, 61);
397	LEGAL_ALT(ALT_O);
398	continue;
399
400	#ifndef TIME_MAX
401	#define TIME_MAX INT64_MAX
402	#endif
403	case 's': /* seconds since the epoch */
404	{
405	time_t sse = 0;
406	uint64_t rulim = TIME_MAX;
407
408	if (bp < '0' \|\| bp > '9') {
409	bp = NULL;
410	continue;
411	}
412
413	do {
414	sse *= 10;
415	sse += *bp++ - '0';
416	rulim /= 10;
417	} while ((sse * 10 <= TIME_MAX) &&
418	rulim && bp >= '0' && bp <= '9');
419
420	if (sse < 0 \|\| (uint64_t)sse > TIME_MAX) {
421	bp = NULL;
422	continue;
423	}
424	#ifdef _WIN32
425	if (localtime_s(tm, &sse) == 0)
426	#else
427	if (localtime_r(&sse, tm))
428	#endif
429	state \|= S_YDAY \| S_WDAY \| S_MON \| S_MDAY \| S_YEAR;
430	else
431	bp = NULL;
432	}
433	continue;
434
435	case 'U': /* The week of year, beginning on sunday. */
436	case 'W': /* The week of year, beginning on monday. */
437	/*
438	* This is bogus, as we can not assume any valid
439	* information present in the tm structure at this
440	* point to calculate a real value, so save the
441	* week for now in case it can be used later.
442	*/
443	bp = conv_num(bp, &i, 0, 53);
444	LEGAL_ALT(ALT_O);
445	if (c == 'U')
446	day_offset = TM_SUNDAY;
447	else
448	day_offset = TM_MONDAY;
449	week_offset = i;
450	continue;
451
452	case 'w': /* The day of week, beginning on sunday. */
453	bp = conv_num(bp, &tm->tm_wday, 0, 6);
454	LEGAL_ALT(ALT_O);
455	state \|= S_WDAY;
456	continue;
457
458	case 'u': /* The day of week, monday = 1. */
459	bp = conv_num(bp, &i, 1, 7);
460	tm->tm_wday = i % 7;
461	LEGAL_ALT(ALT_O);
462	state \|= S_WDAY;
463	continue;
464
465	case 'g': /* The year corresponding to the ISO week
466	* number but without the century.
467	*/
468	bp = conv_num(bp, &i, 0, 99);
469	continue;
470
471	case 'G': /* The year corresponding to the ISO week
472	* number with century.
473	*/
474	do
475	bp++;
476	while (isdigit(*bp));
477	continue;
478
479	case 'V': /* The ISO 8601:1988 week number as decimal */
480	bp = conv_num(bp, &i, 0, 53);
481	continue;
482
483	case 'Y': /* The year. */
484	i = TM_YEAR_BASE; /* just for data sanity... */
485	bp = conv_num(bp, &i, 0, 9999);
486	tm->tm_year = i - TM_YEAR_BASE;
487	LEGAL_ALT(ALT_E);
488	state \|= S_YEAR;
489	continue;
490
491	case 'y': /* The year within 100 years of the epoch. */
492	/* LEGAL_ALT(ALT_E \| ALT_O); */
493	bp = conv_num(bp, &i, 0, 99);
494
495	if (split_year)
496	/* preserve century */
497	i += (tm->tm_year / 100) * 100;
498	else {
499	split_year = 1;
500	if (i <= 68)
501	i = i + 2000 - TM_YEAR_BASE;
502	}
503	tm->tm_year = i;
504	state \|= S_YEAR;
505	continue;
506
507	case 'Z': // time zone name
508	case 'z': //
509	#ifdef _WIN32
510	_tzset();
511	#else
512	tzset();
513	#endif
514	mandatory = c == 'z';
515	/*
516	* We recognize all ISO 8601 formats:
517	* Z = Zulu time/UTC
518	* [+-]hhmm
519	* [+-]hh:mm
520	* [+-]hh
521	* We recognize all RFC-822/RFC-2822 formats:
522	* UT\|GMT
523	* North American : UTC offsets
524	* E[DS]T = Eastern : -4 \| -5
525	* C[DS]T = Central : -5 \| -6
526	* M[DS]T = Mountain: -6 \| -7
527	* P[DS]T = Pacific : -7 \| -8
528	* Nautical/Military
529	* [A-IL-M] = -1 ... -9 (J not used)
530	* [N-Y] = +1 ... +12
531	* Note: J maybe used to denote non-nautical
532	* local time
533	*/
534	if (mandatory)
535	while (isspace(*bp))
536	bp++;
537
538	zname = bp;
539	switch (*bp++) {
540	case 'G':
541	if (*bp++ != 'M')
542	goto namedzone;
543	/FALLTHROUGH/
544	case 'U':
545	if (*bp++ != 'T')
546	goto namedzone;
547	else if (!delim(bp) && bp++ != 'C')
548	goto namedzone;
549	/FALLTHROUGH/
550	case 'Z':
551	if (!delim(*bp))
552	goto namedzone;
553	tm->tm_isdst = 0;
554	#ifdef TM_GMTOFF
555	tm->TM_GMTOFF = 0;
556	#endif
557	#ifdef TM_ZONE
558	tm->TM_ZONE = utc;
559	#endif
560	continue;
561	case '+':
562	neg = 0;
563	break;
564	case '-':
565	neg = 1;
566	break;
567	default:
568	namedzone:
569	bp = zname;
570
571	/* Nautical / Military style */
572	if (delim(bp[1]) &&
573	((bp >= 'A' && bp <= 'I') \|\|
574	(bp >= 'L' && bp <= 'Y'))) {
575	#ifdef TM_GMTOFF
576	/* Argh! No 'J'! */
577	if (bp >= 'A' && bp <= 'I')
578	tm->TM_GMTOFF =
579	(int)*bp - ('A' - 1);
580	else if (bp >= 'L' && bp <= 'M')
581	tm->TM_GMTOFF = (int)*bp - 'A';
582	else if (bp >= 'N' && bp <= 'Y')
583	tm->TM_GMTOFF = 'M' - (int)*bp;
584	tm->TM_GMTOFF *= SECSPERHOUR;
585	#endif
586	#ifdef TM_ZONE
587	tm->TM_ZONE = NULL; /* XXX */
588	#endif
589	bp++;
590	continue;
591	}
592	/* 'J' is local time */
593	if (delim(bp[1]) && *bp == 'J') {
594	#ifdef TM_GMTOFF
595	tm->TM_GMTOFF = -timezone;
596	#endif
597	#ifdef TM_ZONE
598	tm->TM_ZONE = NULL; /* XXX */
599	#endif
600	bp++;
601	continue;
602	}
603
604	/*
605	* From our 3 letter hard-coded table
606	* XXX: Can be removed, handled by tzload()
607	*/
608	if (delim(bp[0]) \|\| delim(bp[1]) \|\|
609	delim(bp[2]) \|\| !delim(bp[3]))
610	goto loadzone;
611	ep = find_string(bp, &i, nast, NULL, 4);
612	if (ep != NULL) {
613	#ifdef TM_GMTOFF
614	tm->TM_GMTOFF = (-5 - i) * SECSPERHOUR;
615	#endif
616	#ifdef TM_ZONE
617	tm->TM_ZONE = __UNCONST(nast[i]);
618	#endif
619	bp = ep;
620	continue;
621	}
622	ep = find_string(bp, &i, nadt, NULL, 4);
623	if (ep != NULL) {
624	tm->tm_isdst = 1;
625	#ifdef TM_GMTOFF
626	tm->TM_GMTOFF = (-4 - i) * SECSPERHOUR;
627	#endif
628	#ifdef TM_ZONE
629	tm->TM_ZONE = __UNCONST(nadt[i]);
630	#endif
631	bp = ep;
632	continue;
633	}
634	/*
635	* Our current timezone
636	*/
637	ep = find_string(bp, &i,
638	(const char * const *)NULL,
639	NULL, 2);
640	if (ep != NULL) {
641	tm->tm_isdst = i;
642	#ifdef TM_GMTOFF
643	tm->TM_GMTOFF = -timezone;
644	#endif
645	#ifdef TM_ZONE
646	tm->TM_ZONE = tzname[i];
647	#endif
648	bp = ep;
649	continue;
650	}
651	loadzone:
652	/*
653	* The hard way, load the zone!
654	*/
655	if (fromzone(&bp, tm, mandatory))
656	continue;
657	goto out;
658	}
659	offs = 0;
660	for (i = 0; i < 4; ) {
661	if (isdigit(*bp)) {
662	offs = offs * 10 + (*bp++ - '0');
663	i++;
664	continue;
665	}
666	if (i == 2 && *bp == ':') {
667	bp++;
668	continue;
669	}
670	break;
671	}
672	if (isdigit(*bp))
673	goto out;
674	switch (i) {
675	case 2:
676	offs *= SECSPERHOUR;
677	break;
678	case 4:
679	i = offs % 100;
680	offs /= 100;
681	if (i >= SECSPERMIN)
682	goto out;
683	/* Convert minutes into decimal */
684	offs = offs * SECSPERHOUR + i * SECSPERMIN;
685	break;
686	default:
687	out:
688	if (mandatory)
689	return NULL;
690	bp = zname;
691	continue;
692	}
693	/* ISO 8601 & RFC 3339 limit to 23:59 max */
694	if (offs >= (HOURSPERDAY * SECSPERHOUR))
695	goto out;
696	if (neg)
697	offs = -offs;
698	tm->tm_isdst = 0; /* XXX */
699	#ifdef TM_GMTOFF
700	tm->TM_GMTOFF = offs;
701	#endif
702	#ifdef TM_ZONE
703	tm->TM_ZONE = NULL; /* XXX */
704	#endif
705	continue;
706
707	/*
708	* Miscellaneous conversions.
709	*/
710	case 'n': /* Any kind of white-space. */
711	case 't':
712	while (isspace(*bp))
713	bp++;
714	LEGAL_ALT(0);
715	continue;
716
717
718	default: /* Unknown/unsupported conversion. */
719	return NULL;
720	}
721	}
722
723	if (!HAVE_YDAY(state) && HAVE_YEAR(state)) {
724	if (HAVE_MON(state) && HAVE_MDAY(state)) {
725	/* calculate day of year (ordinal date) */
726	tm->tm_yday = start_of_month[isleap_sum(tm->tm_year,
727	TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
728	state \|= S_YDAY;
729	} else if (day_offset != -1) {
730	/*
731	* Set the date to the first Sunday (or Monday)
732	* of the specified week of the year.
733	*/
734	if (!HAVE_WDAY(state)) {
735	tm->tm_wday = day_offset;
736	state \|= S_WDAY;
737	}
738	tm->tm_yday = (7 -
739	first_wday_of(tm->tm_year + TM_YEAR_BASE) +
740	day_offset) % 7 + (week_offset - 1) * 7 +
741	tm->tm_wday - day_offset;
742	state \|= S_YDAY;
743	}
744	}
745
746	if (HAVE_YDAY(state) && HAVE_YEAR(state)) {
747	int isleap;
748
749	if (!HAVE_MON(state)) {
750	/* calculate month of day of year */
751	i = 0;
752	isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
753	while (tm->tm_yday >= start_of_month[isleap][i])
754	i++;
755	if (i > 12) {
756	i = 1;
757	tm->tm_yday -= start_of_month[isleap][12];
758	tm->tm_year++;
759	}
760	tm->tm_mon = i - 1;
761	state \|= S_MON;
762	}
763
764	if (!HAVE_MDAY(state)) {
765	/* calculate day of month */
766	isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
767	tm->tm_mday = tm->tm_yday -
768	start_of_month[isleap][tm->tm_mon] + 1;
769	state \|= S_MDAY;
770	}
771
772	if (!HAVE_WDAY(state)) {
773	/* calculate day of week */
774	i = 0;
775	week_offset = first_wday_of(tm->tm_year);
776	while (i++ <= tm->tm_yday) {
777	if (week_offset++ >= 6)
778	week_offset = 0;
779	}
780	tm->tm_wday = week_offset;
781	state \|= S_WDAY;
782	}
783	}
784
785	return (char*)bp;
786	}
787
788
789	static const unsigned char *
790	conv_num(const unsigned char buf, int dest, unsigned int llim, unsigned int ulim)
791	{
792	unsigned int result = 0;
793	unsigned char ch;
794
795	/* The limit also determines the number of valid digits. */
796	unsigned int rulim = ulim;
797
798	ch = *buf;
799	if (ch < '0' \|\| ch > '9')
800	return NULL;
801
802	do {
803	result *= 10;
804	result += ch - '0';
805	rulim /= 10;
806	ch = *++buf;
807	} while ((result <= ulim) && rulim && ch >= '0' && ch <= '9');
808
809	if (result < llim \|\| result > ulim)
810	return NULL;
811
812	*dest = result;
813	return buf;
814	}
815
816	static const unsigned char *
817	find_string(const unsigned char bp, int tgt, const char * const *n1,
818	const char * const *n2, int c)
819	{
820	int i;
821	size_t len;
822
823	/* check full name - then abbreviated ones */
824	for (; n1 != NULL; n1 = n2, n2 = NULL) {
825	for (i = 0; i < c; i++, n1++) {
826	len = strlen(*n1);
827	if (strncasecmp(n1, (const char )bp, len) == 0) {
828	*tgt = i;
829	return bp + len;
830	}
831	}
832	}
833
834	/* Nothing matched */
835	return NULL;
836	}
837
838	#endif

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source: Main/trunk/Server/strptime.c@ 51

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