strptime.c@ 213

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Last change on this file since 213 was 212, checked in by Nishi, on Oct 3, 2024 at 2:44:55 AM
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[32]	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
[212]	38	#if defined(__MINGW32__) \|\| defined(_MSC_VER)
[34]	39
[32]	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	{
[212]	294	int year;
[32]	295	new_fmt = HERE_D_FMT;
	296	LEGAL_ALT(0);
	297	state \|= S_MON \| S_MDAY \| S_YEAR;
[212]	298	year = split_year ? tm->tm_year : 0;
[32]	299
	300	bp = (const unsigned char )strptime((const char )bp,
	301	new_fmt, tm);
	302	LEGAL_ALT(ALT_E);
	303	tm->tm_year += year;
	304	if (split_year && tm->tm_year % (2000 - TM_YEAR_BASE) <= 68)
	305	tm->tm_year -= 2000 - TM_YEAR_BASE;
	306	split_year = 1;
	307	continue;
	308	}
	309	/*
	310	* "Elementary" conversion rules.
	311	*/
	312	case 'A': /* The day of week, using the locale's form. */
	313	case 'a':
	314	bp = find_string(bp, &tm->tm_wday, weekday_name, ab_weekday_name, 7);
	315	LEGAL_ALT(0);
	316	state \|= S_WDAY;
	317	continue;
	318
	319	case 'B': /* The month, using the locale's form. */
	320	case 'b':
	321	case 'h':
	322	bp = find_string(bp, &tm->tm_mon, month_name, ab_month_name, 12);
	323	LEGAL_ALT(0);
	324	state \|= S_MON;
	325	continue;
	326
	327	case 'C': /* The century number. */
	328	i = 20;
	329	bp = conv_num(bp, &i, 0, 99);
	330
	331	i = i * 100 - TM_YEAR_BASE;
	332	if (split_year)
	333	i += tm->tm_year % 100;
	334	split_year = 1;
	335	tm->tm_year = i;
	336	LEGAL_ALT(ALT_E);
	337	state \|= S_YEAR;
	338	continue;
	339
	340	case 'd': /* The day of month. */
	341	case 'e':
	342	bp = conv_num(bp, &tm->tm_mday, 1, 31);
	343	LEGAL_ALT(ALT_O);
	344	state \|= S_MDAY;
	345	continue;
	346
	347	case 'k': /* The hour (24-hour clock representation). */
	348	LEGAL_ALT(0);
	349	/* FALLTHROUGH */
	350	case 'H':
	351	bp = conv_num(bp, &tm->tm_hour, 0, 23);
	352	LEGAL_ALT(ALT_O);
	353	state \|= S_HOUR;
	354	continue;
	355
	356	case 'l': /* The hour (12-hour clock representation). */
	357	LEGAL_ALT(0);
	358	/* FALLTHROUGH */
	359	case 'I':
	360	bp = conv_num(bp, &tm->tm_hour, 1, 12);
	361	if (tm->tm_hour == 12)
	362	tm->tm_hour = 0;
	363	LEGAL_ALT(ALT_O);
	364	state \|= S_HOUR;
	365	continue;
	366
	367	case 'j': /* The day of year. */
	368	i = 1;
	369	bp = conv_num(bp, &i, 1, 366);
	370	tm->tm_yday = i - 1;
	371	LEGAL_ALT(0);
	372	state \|= S_YDAY;
	373	continue;
	374
	375	case 'M': /* The minute. */
	376	bp = conv_num(bp, &tm->tm_min, 0, 59);
	377	LEGAL_ALT(ALT_O);
	378	continue;
	379
	380	case 'm': /* The month. */
	381	i = 1;
	382	bp = conv_num(bp, &i, 1, 12);
	383	tm->tm_mon = i - 1;
	384	LEGAL_ALT(ALT_O);
	385	state \|= S_MON;
	386	continue;
	387
	388	case 'p': /* The locale's equivalent of AM/PM. */
	389	bp = find_string(bp, &i, am_pm, NULL, 2);
	390	if (HAVE_HOUR(state) && tm->tm_hour > 11)
	391	return NULL;
	392	tm->tm_hour += i * 12;
	393	LEGAL_ALT(0);
	394	continue;
	395
	396	case 'S': /* The seconds. */
	397	bp = conv_num(bp, &tm->tm_sec, 0, 61);
	398	LEGAL_ALT(ALT_O);
	399	continue;
	400
	401	#ifndef TIME_MAX
[212]	402	#ifdef _MSC_VER
	403	#define TIME_MAX INT32_MAX
	404	#else
[32]	405	#define TIME_MAX INT64_MAX
	406	#endif
[212]	407	#endif
[32]	408	case 's': /* seconds since the epoch */
	409	{
	410	time_t sse = 0;
[212]	411	#ifdef _MSC_VER
	412	uint32_t rulim = TIME_MAX;
	413	#else
[32]	414	uint64_t rulim = TIME_MAX;
[212]	415	#endif
[32]	416
	417	if (bp < '0' \|\| bp > '9') {
	418	bp = NULL;
	419	continue;
	420	}
	421
	422	do {
	423	sse *= 10;
	424	sse += *bp++ - '0';
	425	rulim /= 10;
	426	} while ((sse * 10 <= TIME_MAX) &&
	427	rulim && bp >= '0' && bp <= '9');
[212]	428	#ifdef _MSC_VER
	429	if (sse < 0 \|\| (uint32_t)sse > TIME_MAX) {
	430	#else
[32]	431	if (sse < 0 \|\| (uint64_t)sse > TIME_MAX) {
[212]	432	#endif
[32]	433	bp = NULL;
	434	continue;
	435	}
	436	#ifdef _WIN32
[212]	437	#ifdef _MSC_VER
	438	if (1)
	439	#else
[32]	440	if (localtime_s(tm, &sse) == 0)
[212]	441	#endif
[32]	442	#else
	443	if (localtime_r(&sse, tm))
	444	#endif
	445	state \|= S_YDAY \| S_WDAY \| S_MON \| S_MDAY \| S_YEAR;
	446	else
	447	bp = NULL;
	448	}
	449	continue;
	450
	451	case 'U': /* The week of year, beginning on sunday. */
	452	case 'W': /* The week of year, beginning on monday. */
	453	/*
	454	* This is bogus, as we can not assume any valid
	455	* information present in the tm structure at this
	456	* point to calculate a real value, so save the
	457	* week for now in case it can be used later.
	458	*/
	459	bp = conv_num(bp, &i, 0, 53);
	460	LEGAL_ALT(ALT_O);
	461	if (c == 'U')
	462	day_offset = TM_SUNDAY;
	463	else
	464	day_offset = TM_MONDAY;
	465	week_offset = i;
	466	continue;
	467
	468	case 'w': /* The day of week, beginning on sunday. */
	469	bp = conv_num(bp, &tm->tm_wday, 0, 6);
	470	LEGAL_ALT(ALT_O);
	471	state \|= S_WDAY;
	472	continue;
	473
	474	case 'u': /* The day of week, monday = 1. */
	475	bp = conv_num(bp, &i, 1, 7);
	476	tm->tm_wday = i % 7;
	477	LEGAL_ALT(ALT_O);
	478	state \|= S_WDAY;
	479	continue;
	480
	481	case 'g': /* The year corresponding to the ISO week
	482	* number but without the century.
	483	*/
	484	bp = conv_num(bp, &i, 0, 99);
	485	continue;
	486
	487	case 'G': /* The year corresponding to the ISO week
	488	* number with century.
	489	*/
	490	do
	491	bp++;
	492	while (isdigit(*bp));
	493	continue;
	494
	495	case 'V': /* The ISO 8601:1988 week number as decimal */
	496	bp = conv_num(bp, &i, 0, 53);
	497	continue;
	498
	499	case 'Y': /* The year. */
	500	i = TM_YEAR_BASE; /* just for data sanity... */
	501	bp = conv_num(bp, &i, 0, 9999);
	502	tm->tm_year = i - TM_YEAR_BASE;
	503	LEGAL_ALT(ALT_E);
	504	state \|= S_YEAR;
	505	continue;
	506
	507	case 'y': /* The year within 100 years of the epoch. */
	508	/* LEGAL_ALT(ALT_E \| ALT_O); */
	509	bp = conv_num(bp, &i, 0, 99);
	510
	511	if (split_year)
	512	/* preserve century */
	513	i += (tm->tm_year / 100) * 100;
	514	else {
	515	split_year = 1;
	516	if (i <= 68)
	517	i = i + 2000 - TM_YEAR_BASE;
	518	}
	519	tm->tm_year = i;
	520	state \|= S_YEAR;
	521	continue;
	522
	523	case 'Z': // time zone name
	524	case 'z': //
	525	#ifdef _WIN32
	526	_tzset();
	527	#else
	528	tzset();
	529	#endif
	530	mandatory = c == 'z';
	531	/*
	532	* We recognize all ISO 8601 formats:
	533	* Z = Zulu time/UTC
	534	* [+-]hhmm
	535	* [+-]hh:mm
	536	* [+-]hh
	537	* We recognize all RFC-822/RFC-2822 formats:
	538	* UT\|GMT
	539	* North American : UTC offsets
	540	* E[DS]T = Eastern : -4 \| -5
	541	* C[DS]T = Central : -5 \| -6
	542	* M[DS]T = Mountain: -6 \| -7
	543	* P[DS]T = Pacific : -7 \| -8
	544	* Nautical/Military
	545	* [A-IL-M] = -1 ... -9 (J not used)
	546	* [N-Y] = +1 ... +12
	547	* Note: J maybe used to denote non-nautical
	548	* local time
	549	*/
	550	if (mandatory)
	551	while (isspace(*bp))
	552	bp++;
	553
	554	zname = bp;
	555	switch (*bp++) {
	556	case 'G':
	557	if (*bp++ != 'M')
	558	goto namedzone;
	559	/FALLTHROUGH/
	560	case 'U':
	561	if (*bp++ != 'T')
	562	goto namedzone;
	563	else if (!delim(bp) && bp++ != 'C')
	564	goto namedzone;
	565	/FALLTHROUGH/
	566	case 'Z':
	567	if (!delim(*bp))
	568	goto namedzone;
	569	tm->tm_isdst = 0;
	570	#ifdef TM_GMTOFF
	571	tm->TM_GMTOFF = 0;
	572	#endif
	573	#ifdef TM_ZONE
	574	tm->TM_ZONE = utc;
	575	#endif
	576	continue;
	577	case '+':
	578	neg = 0;
	579	break;
	580	case '-':
	581	neg = 1;
	582	break;
	583	default:
	584	namedzone:
	585	bp = zname;
	586
	587	/* Nautical / Military style */
	588	if (delim(bp[1]) &&
	589	((bp >= 'A' && bp <= 'I') \|\|
	590	(bp >= 'L' && bp <= 'Y'))) {
	591	#ifdef TM_GMTOFF
	592	/* Argh! No 'J'! */
	593	if (bp >= 'A' && bp <= 'I')
	594	tm->TM_GMTOFF =
	595	(int)*bp - ('A' - 1);
	596	else if (bp >= 'L' && bp <= 'M')
	597	tm->TM_GMTOFF = (int)*bp - 'A';
	598	else if (bp >= 'N' && bp <= 'Y')
	599	tm->TM_GMTOFF = 'M' - (int)*bp;
	600	tm->TM_GMTOFF *= SECSPERHOUR;
	601	#endif
	602	#ifdef TM_ZONE
	603	tm->TM_ZONE = NULL; /* XXX */
	604	#endif
	605	bp++;
	606	continue;
	607	}
	608	/* 'J' is local time */
	609	if (delim(bp[1]) && *bp == 'J') {
	610	#ifdef TM_GMTOFF
	611	tm->TM_GMTOFF = -timezone;
	612	#endif
	613	#ifdef TM_ZONE
	614	tm->TM_ZONE = NULL; /* XXX */
	615	#endif
	616	bp++;
	617	continue;
	618	}
	619
	620	/*
	621	* From our 3 letter hard-coded table
	622	* XXX: Can be removed, handled by tzload()
	623	*/
	624	if (delim(bp[0]) \|\| delim(bp[1]) \|\|
	625	delim(bp[2]) \|\| !delim(bp[3]))
	626	goto loadzone;
	627	ep = find_string(bp, &i, nast, NULL, 4);
	628	if (ep != NULL) {
	629	#ifdef TM_GMTOFF
	630	tm->TM_GMTOFF = (-5 - i) * SECSPERHOUR;
	631	#endif
	632	#ifdef TM_ZONE
	633	tm->TM_ZONE = __UNCONST(nast[i]);
	634	#endif
	635	bp = ep;
	636	continue;
	637	}
	638	ep = find_string(bp, &i, nadt, NULL, 4);
	639	if (ep != NULL) {
	640	tm->tm_isdst = 1;
	641	#ifdef TM_GMTOFF
	642	tm->TM_GMTOFF = (-4 - i) * SECSPERHOUR;
	643	#endif
	644	#ifdef TM_ZONE
	645	tm->TM_ZONE = __UNCONST(nadt[i]);
	646	#endif
	647	bp = ep;
	648	continue;
	649	}
	650	/*
	651	* Our current timezone
	652	*/
	653	ep = find_string(bp, &i,
[44]	654	(const char * const *)NULL,
[32]	655	NULL, 2);
	656	if (ep != NULL) {
	657	tm->tm_isdst = i;
	658	#ifdef TM_GMTOFF
	659	tm->TM_GMTOFF = -timezone;
	660	#endif
	661	#ifdef TM_ZONE
	662	tm->TM_ZONE = tzname[i];
	663	#endif
	664	bp = ep;
	665	continue;
	666	}
	667	loadzone:
	668	/*
	669	* The hard way, load the zone!
	670	*/
	671	if (fromzone(&bp, tm, mandatory))
	672	continue;
	673	goto out;
	674	}
	675	offs = 0;
	676	for (i = 0; i < 4; ) {
	677	if (isdigit(*bp)) {
	678	offs = offs * 10 + (*bp++ - '0');
	679	i++;
	680	continue;
	681	}
	682	if (i == 2 && *bp == ':') {
	683	bp++;
	684	continue;
	685	}
	686	break;
	687	}
	688	if (isdigit(*bp))
	689	goto out;
	690	switch (i) {
	691	case 2:
	692	offs *= SECSPERHOUR;
	693	break;
	694	case 4:
	695	i = offs % 100;
	696	offs /= 100;
	697	if (i >= SECSPERMIN)
	698	goto out;
	699	/* Convert minutes into decimal */
	700	offs = offs * SECSPERHOUR + i * SECSPERMIN;
	701	break;
	702	default:
	703	out:
	704	if (mandatory)
	705	return NULL;
	706	bp = zname;
	707	continue;
	708	}
	709	/* ISO 8601 & RFC 3339 limit to 23:59 max */
	710	if (offs >= (HOURSPERDAY * SECSPERHOUR))
	711	goto out;
	712	if (neg)
	713	offs = -offs;
	714	tm->tm_isdst = 0; /* XXX */
	715	#ifdef TM_GMTOFF
	716	tm->TM_GMTOFF = offs;
	717	#endif
	718	#ifdef TM_ZONE
	719	tm->TM_ZONE = NULL; /* XXX */
	720	#endif
	721	continue;
	722
	723	/*
	724	* Miscellaneous conversions.
	725	*/
	726	case 'n': /* Any kind of white-space. */
	727	case 't':
	728	while (isspace(*bp))
	729	bp++;
	730	LEGAL_ALT(0);
	731	continue;
	732
	733
	734	default: /* Unknown/unsupported conversion. */
	735	return NULL;
	736	}
	737	}
	738
	739	if (!HAVE_YDAY(state) && HAVE_YEAR(state)) {
	740	if (HAVE_MON(state) && HAVE_MDAY(state)) {
	741	/* calculate day of year (ordinal date) */
	742	tm->tm_yday = start_of_month[isleap_sum(tm->tm_year,
	743	TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
	744	state \|= S_YDAY;
	745	} else if (day_offset != -1) {
	746	/*
	747	* Set the date to the first Sunday (or Monday)
	748	* of the specified week of the year.
	749	*/
	750	if (!HAVE_WDAY(state)) {
	751	tm->tm_wday = day_offset;
	752	state \|= S_WDAY;
	753	}
	754	tm->tm_yday = (7 -
	755	first_wday_of(tm->tm_year + TM_YEAR_BASE) +
	756	day_offset) % 7 + (week_offset - 1) * 7 +
	757	tm->tm_wday - day_offset;
	758	state \|= S_YDAY;
	759	}
	760	}
	761
	762	if (HAVE_YDAY(state) && HAVE_YEAR(state)) {
	763	int isleap;
	764
	765	if (!HAVE_MON(state)) {
	766	/* calculate month of day of year */
	767	i = 0;
	768	isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
	769	while (tm->tm_yday >= start_of_month[isleap][i])
	770	i++;
	771	if (i > 12) {
	772	i = 1;
	773	tm->tm_yday -= start_of_month[isleap][12];
	774	tm->tm_year++;
	775	}
	776	tm->tm_mon = i - 1;
	777	state \|= S_MON;
	778	}
	779
	780	if (!HAVE_MDAY(state)) {
	781	/* calculate day of month */
	782	isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);
	783	tm->tm_mday = tm->tm_yday -
	784	start_of_month[isleap][tm->tm_mon] + 1;
	785	state \|= S_MDAY;
	786	}
	787
	788	if (!HAVE_WDAY(state)) {
	789	/* calculate day of week */
	790	i = 0;
	791	week_offset = first_wday_of(tm->tm_year);
	792	while (i++ <= tm->tm_yday) {
	793	if (week_offset++ >= 6)
	794	week_offset = 0;
	795	}
	796	tm->tm_wday = week_offset;
	797	state \|= S_WDAY;
	798	}
	799	}
	800
	801	return (char*)bp;
	802	}
	803
	804
	805	static const unsigned char *
	806	conv_num(const unsigned char buf, int dest, unsigned int llim, unsigned int ulim)
	807	{
	808	unsigned int result = 0;
	809	unsigned char ch;
	810
	811	/* The limit also determines the number of valid digits. */
	812	unsigned int rulim = ulim;
	813
	814	ch = *buf;
	815	if (ch < '0' \|\| ch > '9')
	816	return NULL;
	817
	818	do {
	819	result *= 10;
	820	result += ch - '0';
	821	rulim /= 10;
	822	ch = *++buf;
	823	} while ((result <= ulim) && rulim && ch >= '0' && ch <= '9');
	824
	825	if (result < llim \|\| result > ulim)
	826	return NULL;
	827
	828	*dest = result;
	829	return buf;
	830	}
	831
	832	static const unsigned char *
	833	find_string(const unsigned char bp, int tgt, const char * const *n1,
	834	const char * const *n2, int c)
	835	{
	836	int i;
	837	size_t len;
	838
	839	/* check full name - then abbreviated ones */
	840	for (; n1 != NULL; n1 = n2, n2 = NULL) {
	841	for (i = 0; i < c; i++, n1++) {
	842	len = strlen(*n1);
	843	if (strncasecmp(n1, (const char )bp, len) == 0) {
	844	*tgt = i;
	845	return bp + len;
	846	}
	847	}
	848	}
	849
	850	/* Nothing matched */
	851	return NULL;
	852	}
[34]	853
	854	#endif

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source: Main/trunk/Server/strptime.c@ 213

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