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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/time/strptime.c	Lines:	0	295	0.0 %
Date:	2017-11-07	Branches:	0	303	0.0 %


/*	$OpenBSD: strptime.c,v 1.22 2016/05/23 00:05:15 guenther Exp $ */
/*	$NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft Exp $	*/
/*-
 * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code was contributed to The NetBSD Foundation by Klaus Klein.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <ctype.h>
#include <locale.h>
#include <string.h>
#include <time.h>

#include "localedef.h"
#include "private.h"
#include "tzfile.h"

#define	_ctloc(x)		(_CurrentTimeLocale->x)

/*
 * We do not implement alternate representations. However, we always
 * check whether a given modifier is allowed for a certain conversion.
 */
#define _ALT_E			0x01
#define _ALT_O			0x02
#define	_LEGAL_ALT(x)		{ if (alt_format & ~(x)) return (0); }

/*
 * We keep track of some of the fields we set in order to compute missing ones.
 */
#define FIELD_TM_MON	(1 << 0)
#define FIELD_TM_MDAY	(1 << 1)
#define FIELD_TM_WDAY	(1 << 2)
#define FIELD_TM_YDAY	(1 << 3)
#define FIELD_TM_YEAR	(1 << 4)

static char gmt[] = { "GMT" };
static char utc[] = { "UTC" };
/* RFC-822/RFC-2822 */
static const char * const nast[5] = {
       "EST",    "CST",    "MST",    "PST",    "\0\0\0"
};
static const char * const nadt[5] = {
       "EDT",    "CDT",    "MDT",    "PDT",    "\0\0\0"
};

static const int mon_lengths[2][MONSPERYEAR] = {
        { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
        { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};

static	int _conv_num(const unsigned char **, int *, int, int);
static	int leaps_thru_end_of(const int y);
static	char *_strptime(const char *, const char *, struct tm *, int);
static	const u_char *_find_string(const u_char *, int *, const char * const *,
	    const char * const *, int);


char *
strptime(const char *buf, const char *fmt, struct tm *tm)
{
	return(_strptime(buf, fmt, tm, 1));
}
DEF_WEAK(strptime);

static char *
_strptime(const char *buf, const char *fmt, struct tm *tm, int initialize)
{
	unsigned char c;
	const unsigned char *bp, *ep;
	size_t len;
	int alt_format, i, offs;
	int neg = 0;
	static int century, relyear, fields;

	if (initialize) {
		century = TM_YEAR_BASE;
		relyear = -1;
		fields = 0;
	}

	bp = (const unsigned char *)buf;
	while ((c = *fmt) != '\0') {
		/* Clear `alternate' modifier prior to new conversion. */
		alt_format = 0;

		/* Eat up white-space. */
		if (isspace(c)) {
			while (isspace(*bp))
				bp++;

			fmt++;
			continue;
		}

		if ((c = *fmt++) != '%')
			goto literal;


again:		switch (c = *fmt++) {
		case '%':	/* "%%" is converted to "%". */
literal:
		if (c != *bp++)
			return (NULL);

		break;

		/*
		 * "Alternative" modifiers. Just set the appropriate flag
		 * and start over again.
		 */
		case 'E':	/* "%E?" alternative conversion modifier. */
			_LEGAL_ALT(0);
			alt_format |= _ALT_E;
			goto again;

		case 'O':	/* "%O?" alternative conversion modifier. */
			_LEGAL_ALT(0);
			alt_format |= _ALT_O;
			goto again;

		/*
		 * "Complex" conversion rules, implemented through recursion.
		 */
		case 'c':	/* Date and time, using the locale's format. */
			_LEGAL_ALT(_ALT_E);
			if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, 0)))
				return (NULL);
			break;

		case 'D':	/* The date as "%m/%d/%y". */
			_LEGAL_ALT(0);
			if (!(bp = _strptime(bp, "%m/%d/%y", tm, 0)))
				return (NULL);
			break;

		case 'F':	/* The date as "%Y-%m-%d". */
			_LEGAL_ALT(0);
			if (!(bp = _strptime(bp, "%Y-%m-%d", tm, 0)))
				return (NULL);
			continue;

		case 'R':	/* The time as "%H:%M". */
			_LEGAL_ALT(0);
			if (!(bp = _strptime(bp, "%H:%M", tm, 0)))
				return (NULL);
			break;

		case 'r':	/* The time as "%I:%M:%S %p". */
			_LEGAL_ALT(0);
			if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, 0)))
				return (NULL);
			break;

		case 'T':	/* The time as "%H:%M:%S". */
			_LEGAL_ALT(0);
			if (!(bp = _strptime(bp, "%H:%M:%S", tm, 0)))
				return (NULL);
			break;

		case 'X':	/* The time, using the locale's format. */
			_LEGAL_ALT(_ALT_E);
			if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, 0)))
				return (NULL);
			break;

		case 'x':	/* The date, using the locale's format. */
			_LEGAL_ALT(_ALT_E);
			if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, 0)))
				return (NULL);
			break;

		/*
		 * "Elementary" conversion rules.
		 */
		case 'A':	/* The day of week, using the locale's form. */
		case 'a':
			_LEGAL_ALT(0);
			for (i = 0; i < 7; i++) {
				/* Full name. */
				len = strlen(_ctloc(day[i]));
				if (strncasecmp(_ctloc(day[i]), bp, len) == 0)
					break;

				/* Abbreviated name. */
				len = strlen(_ctloc(abday[i]));
				if (strncasecmp(_ctloc(abday[i]), bp, len) == 0)
					break;
			}

			/* Nothing matched. */
			if (i == 7)
				return (NULL);

			tm->tm_wday = i;
			bp += len;
			fields |= FIELD_TM_WDAY;
			break;

		case 'B':	/* The month, using the locale's form. */
		case 'b':
		case 'h':
			_LEGAL_ALT(0);
			for (i = 0; i < 12; i++) {
				/* Full name. */
				len = strlen(_ctloc(mon[i]));
				if (strncasecmp(_ctloc(mon[i]), bp, len) == 0)
					break;

				/* Abbreviated name. */
				len = strlen(_ctloc(abmon[i]));
				if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0)
					break;
			}

			/* Nothing matched. */
			if (i == 12)
				return (NULL);

			tm->tm_mon = i;
			bp += len;
			fields |= FIELD_TM_MON;
			break;

		case 'C':	/* The century number. */
			_LEGAL_ALT(_ALT_E);
			if (!(_conv_num(&bp, &i, 0, 99)))
				return (NULL);

			century = i * 100;
			break;

		case 'd':	/* The day of month. */
		case 'e':
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_mday, 1, 31)))
				return (NULL);
			fields |= FIELD_TM_MDAY;
			break;

		case 'k':	/* The hour (24-hour clock representation). */
			_LEGAL_ALT(0);
			/* FALLTHROUGH */
		case 'H':
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_hour, 0, 23)))
				return (NULL);
			break;

		case 'l':	/* The hour (12-hour clock representation). */
			_LEGAL_ALT(0);
			/* FALLTHROUGH */
		case 'I':
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_hour, 1, 12)))
				return (NULL);
			break;

		case 'j':	/* The day of year. */
			_LEGAL_ALT(0);
			if (!(_conv_num(&bp, &tm->tm_yday, 1, 366)))
				return (NULL);
			tm->tm_yday--;
			fields |= FIELD_TM_YDAY;
			break;

		case 'M':	/* The minute. */
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_min, 0, 59)))
				return (NULL);
			break;

		case 'm':	/* The month. */
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_mon, 1, 12)))
				return (NULL);
			tm->tm_mon--;
			fields |= FIELD_TM_MON;
			break;

		case 'p':	/* The locale's equivalent of AM/PM. */
			_LEGAL_ALT(0);
			/* AM? */
			len = strlen(_ctloc(am_pm[0]));
			if (strncasecmp(_ctloc(am_pm[0]), bp, len) == 0) {
				if (tm->tm_hour > 12)	/* i.e., 13:00 AM ?! */
					return (NULL);
				else if (tm->tm_hour == 12)
					tm->tm_hour = 0;

				bp += len;
				break;
			}
			/* PM? */
			len = strlen(_ctloc(am_pm[1]));
			if (strncasecmp(_ctloc(am_pm[1]), bp, len) == 0) {
				if (tm->tm_hour > 12)	/* i.e., 13:00 PM ?! */
					return (NULL);
				else if (tm->tm_hour < 12)
					tm->tm_hour += 12;

				bp += len;
				break;
			}

			/* Nothing matched. */
			return (NULL);

		case 'S':	/* The seconds. */
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_sec, 0, 61)))
				return (NULL);
			break;

		case 'U':	/* The week of year, beginning on sunday. */
		case 'W':	/* The week of year, beginning on monday. */
			_LEGAL_ALT(_ALT_O);
			/*
			 * XXX This is bogus, as we can not assume any valid
			 * information present in the tm structure at this
			 * point to calculate a real value, so just check the
			 * range for now.
			 */
			 if (!(_conv_num(&bp, &i, 0, 53)))
				return (NULL);
			 break;

		case 'w':	/* The day of week, beginning on sunday. */
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &tm->tm_wday, 0, 6)))
				return (NULL);
			fields |= FIELD_TM_WDAY;
			break;

		case 'u':	/* The day of week, monday = 1. */
			_LEGAL_ALT(_ALT_O);
			if (!(_conv_num(&bp, &i, 1, 7)))
				return (NULL);
			tm->tm_wday = i % 7;
			fields |= FIELD_TM_WDAY;
			continue;

		case 'g':	/* The year corresponding to the ISO week
				 * number but without the century.
				 */
			if (!(_conv_num(&bp, &i, 0, 99)))
				return (NULL);
			continue;

		case 'G':	/* The year corresponding to the ISO week
				 * number with century.
				 */
			do
				bp++;
			while (isdigit(*bp));
			continue;

		case 'V':	/* The ISO 8601:1988 week number as decimal */
			if (!(_conv_num(&bp, &i, 0, 53)))
				return (NULL);
			continue;

		case 'Y':	/* The year. */
			_LEGAL_ALT(_ALT_E);
			if (!(_conv_num(&bp, &i, 0, 9999)))
				return (NULL);

			relyear = -1;
			tm->tm_year = i - TM_YEAR_BASE;
			fields |= FIELD_TM_YEAR;
			break;

		case 'y':	/* The year within the century (2 digits). */
			_LEGAL_ALT(_ALT_E | _ALT_O);
			if (!(_conv_num(&bp, &relyear, 0, 99)))
				return (NULL);
			break;

		case 'Z':
			tzset();
			if (strncmp((const char *)bp, gmt, 3) == 0) {
				tm->tm_isdst = 0;
#ifdef TM_GMTOFF
				tm->TM_GMTOFF = 0;
#endif
#ifdef TM_ZONE
				tm->TM_ZONE = gmt;
#endif
				bp += 3;
			} else if (strncmp((const char *)bp, utc, 3) == 0) {
				tm->tm_isdst = 0;
#ifdef TM_GMTOFF
				tm->TM_GMTOFF = 0;
#endif
#ifdef TM_ZONE
				tm->TM_ZONE = utc;
#endif
				bp += 3;
			} else {
				ep = _find_string(bp, &i,
					       	 (const char * const *)tzname,
					       	  NULL, 2);
				if (ep == NULL)
					return (NULL);

				tm->tm_isdst = i;
#ifdef TM_GMTOFF
				tm->TM_GMTOFF = -(timezone);
#endif
#ifdef TM_ZONE
				tm->TM_ZONE = tzname[i];
#endif
				bp = ep;
			}
			continue;

		case 'z':
			/*
			 * We recognize all ISO 8601 formats:
			 * Z	= Zulu time/UTC
			 * [+-]hhmm
			 * [+-]hh:mm
			 * [+-]hh
			 * We recognize all RFC-822/RFC-2822 formats:
			 * UT|GMT
			 *          North American : UTC offsets
			 * E[DS]T = Eastern : -4 | -5
			 * C[DS]T = Central : -5 | -6
			 * M[DS]T = Mountain: -6 | -7
			 * P[DS]T = Pacific : -7 | -8
			 *          Military
			 * [A-IL-M] = -1 ... -9 (J not used)
			 * [N-Y]  = +1 ... +12
			 */
			while (isspace(*bp))
				bp++;

			switch (*bp++) {
			case 'G':
				if (*bp++ != 'M')
					return NULL;
				/*FALLTHROUGH*/
			case 'U':
				if (*bp++ != 'T')
					return NULL;
				/*FALLTHROUGH*/
			case 'Z':
				tm->tm_isdst = 0;
#ifdef TM_GMTOFF
				tm->TM_GMTOFF = 0;
#endif
#ifdef TM_ZONE
				tm->TM_ZONE = utc;
#endif
				continue;
			case '+':
				neg = 0;
				break;
			case '-':
				neg = 1;
				break;
			default:
				--bp;
				ep = _find_string(bp, &i, nast, NULL, 4);
				if (ep != NULL) {
#ifdef TM_GMTOFF
					tm->TM_GMTOFF = -5 - i;
#endif
#ifdef TM_ZONE
					tm->TM_ZONE = (char *)nast[i];
#endif
					bp = ep;
					continue;
				}
				ep = _find_string(bp, &i, nadt, NULL, 4);
				if (ep != NULL) {
					tm->tm_isdst = 1;
#ifdef TM_GMTOFF
					tm->TM_GMTOFF = -4 - i;
#endif
#ifdef TM_ZONE
					tm->TM_ZONE = (char *)nadt[i];
#endif
					bp = ep;
					continue;
				}

				if ((*bp >= 'A' && *bp <= 'I') ||
				    (*bp >= 'L' && *bp <= 'Y')) {
#ifdef TM_GMTOFF
					/* Argh! No 'J'! */
					if (*bp >= 'A' && *bp <= 'I')
						tm->TM_GMTOFF =
						    ('A' - 1) - (int)*bp;
					else if (*bp >= 'L' && *bp <= 'M')
						tm->TM_GMTOFF = 'A' - (int)*bp;
					else if (*bp >= 'N' && *bp <= 'Y')
						tm->TM_GMTOFF = (int)*bp - 'M';
#endif
#ifdef TM_ZONE
					tm->TM_ZONE = NULL; /* XXX */
#endif
					bp++;
					continue;
				}
				return NULL;
			}
			offs = 0;
			for (i = 0; i < 4; ) {
				if (isdigit(*bp)) {
					offs = offs * 10 + (*bp++ - '0');
					i++;
					continue;
				}
				if (i == 2 && *bp == ':') {
					bp++;
					continue;
				}
				break;
			}
			switch (i) {
			case 2:
				offs *= 100;
				break;
			case 4:
				i = offs % 100;
				if (i >= 60)
					return NULL;
				/* Convert minutes into decimal */
				offs = (offs / 100) * 100 + (i * 50) / 30;
				break;
			default:
				return NULL;
			}
			if (neg)
				offs = -offs;
			tm->tm_isdst = 0;	/* XXX */
#ifdef TM_GMTOFF
			tm->TM_GMTOFF = offs;
#endif
#ifdef TM_ZONE
			tm->TM_ZONE = NULL;	/* XXX */
#endif
			continue;

		/*
		 * Miscellaneous conversions.
		 */
		case 'n':	/* Any kind of white-space. */
		case 't':
			_LEGAL_ALT(0);
			while (isspace(*bp))
				bp++;
			break;


		default:	/* Unknown/unsupported conversion. */
			return (NULL);
		}


	}

	/*
	 * We need to evaluate the two digit year spec (%y)
	 * last as we can get a century spec (%C) at any time.
	 */
	if (relyear != -1) {
		if (century == TM_YEAR_BASE) {
			if (relyear <= 68)
				tm->tm_year = relyear + 2000 - TM_YEAR_BASE;
			else
				tm->tm_year = relyear + 1900 - TM_YEAR_BASE;
		} else {
			tm->tm_year = relyear + century - TM_YEAR_BASE;
		}
		fields |= FIELD_TM_YEAR;
	}

	/* Compute some missing values when possible. */
	if (fields & FIELD_TM_YEAR) {
		const int year = tm->tm_year + TM_YEAR_BASE;
		const int *mon_lens = mon_lengths[isleap(year)];
		if (!(fields & FIELD_TM_YDAY) &&
		    (fields & FIELD_TM_MON) && (fields & FIELD_TM_MDAY)) {
			tm->tm_yday = tm->tm_mday - 1;
			for (i = 0; i < tm->tm_mon; i++)
				tm->tm_yday += mon_lens[i];
			fields |= FIELD_TM_YDAY;
		}
		if (fields & FIELD_TM_YDAY) {
			int days = tm->tm_yday;
			if (!(fields & FIELD_TM_WDAY)) {
				tm->tm_wday = EPOCH_WDAY +
				    ((year - EPOCH_YEAR) % DAYSPERWEEK) *
				    (DAYSPERNYEAR % DAYSPERWEEK) +
				    leaps_thru_end_of(year - 1) -
				    leaps_thru_end_of(EPOCH_YEAR - 1) +
				    tm->tm_yday;
				tm->tm_wday %= DAYSPERWEEK;
				if (tm->tm_wday < 0)
					tm->tm_wday += DAYSPERWEEK;
			}
			if (!(fields & FIELD_TM_MON)) {
				tm->tm_mon = 0;
				while (tm->tm_mon < MONSPERYEAR && days >= mon_lens[tm->tm_mon])
					days -= mon_lens[tm->tm_mon++];
			}
			if (!(fields & FIELD_TM_MDAY))
				tm->tm_mday = days + 1;
		}
	}

	return ((char *)bp);
}


static int
_conv_num(const unsigned char **buf, int *dest, int llim, int ulim)
{
	int result = 0;
	int rulim = ulim;

	if (**buf < '0' || **buf > '9')
		return (0);

	/* we use rulim to break out of the loop when we run out of digits */
	do {
		result *= 10;
		result += *(*buf)++ - '0';
		rulim /= 10;
	} while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9');

	if (result < llim || result > ulim)
		return (0);

	*dest = result;
	return (1);
}

static const u_char *
_find_string(const u_char *bp, int *tgt, const char * const *n1,
		const char * const *n2, int c)
{
	int i;
	unsigned int len;

	/* check full name - then abbreviated ones */
	for (; n1 != NULL; n1 = n2, n2 = NULL) {
		for (i = 0; i < c; i++, n1++) {
			len = strlen(*n1);
			if (strncasecmp(*n1, (const char *)bp, len) == 0) {
				*tgt = i;
				return bp + len;
			}
		}
	}

	/* Nothing matched */
	return NULL;
}

static int
leaps_thru_end_of(const int y)
{
	return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
		-(leaps_thru_end_of(-(y + 1)) + 1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: strptime.c,v 1.22 2016/05/23 00:05:15 guenther Exp $ */
2			/* $NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft Exp $ */
3			/*-
4			* Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
5			* All rights reserved.
6			*
7			* This code was contributed to The NetBSD Foundation by Klaus Klein.
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			*
18			* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19			* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20			* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21			* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22			* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23			* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24			* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26			* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27			* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28			* POSSIBILITY OF SUCH DAMAGE.
29			*/
30
31			#include <ctype.h>
32			#include <locale.h>
33			#include <string.h>
34			#include <time.h>
35
36			#include "localedef.h"
37			#include "private.h"
38			#include "tzfile.h"
39
40			#define _ctloc(x) (_CurrentTimeLocale->x)
41
42			/*
43			* We do not implement alternate representations. However, we always
44			* check whether a given modifier is allowed for a certain conversion.
45			*/
46			#define _ALT_E 0x01
47			#define _ALT_O 0x02
48			#define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); }
49
50			/*
51			* We keep track of some of the fields we set in order to compute missing ones.
52			*/
53			#define FIELD_TM_MON (1 << 0)
54			#define FIELD_TM_MDAY (1 << 1)
55			#define FIELD_TM_WDAY (1 << 2)
56			#define FIELD_TM_YDAY (1 << 3)
57			#define FIELD_TM_YEAR (1 << 4)
58
59			static char gmt[] = { "GMT" };
60			static char utc[] = { "UTC" };
61			/* RFC-822/RFC-2822 */
62			static const char * const nast[5] = {
63			"EST", "CST", "MST", "PST", "\0\0\0"
64			};
65			static const char * const nadt[5] = {
66			"EDT", "CDT", "MDT", "PDT", "\0\0\0"
67			};
68
69			static const int mon_lengths[2][MONSPERYEAR] = {
70			{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
71			{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
72			};
73
74			static int _conv_num(const unsigned char *, int , int, int);
75			static int leaps_thru_end_of(const int y);
76			static char _strptime(const char , const char , struct tm , int);
77			static const u_char _find_string(const u_char , int , const char const *,
78			const char * const *, int);
79
80
81			char *
82			strptime(const char buf, const char fmt, struct tm *tm)
83			{
84			return(_strptime(buf, fmt, tm, 1));
85			}
86			DEF_WEAK(strptime);
87
88			static char *
89			_strptime(const char buf, const char fmt, struct tm *tm, int initialize)
90			{
91			unsigned char c;
92			const unsigned char bp, ep;
93			size_t len;
94			int alt_format, i, offs;
95			int neg = 0;
96			static int century, relyear, fields;
97
98			if (initialize) {
99			century = TM_YEAR_BASE;
100			relyear = -1;
101			fields = 0;
102			}
103
104			bp = (const unsigned char *)buf;
105			while ((c = *fmt) != '\0') {
106			/* Clear `alternate' modifier prior to new conversion. */
107			alt_format = 0;
108
109			/* Eat up white-space. */
110			if (isspace(c)) {
111			while (isspace(*bp))
112			bp++;
113
114			fmt++;
115			continue;
116			}
117
118			if ((c = *fmt++) != '%')
119			goto literal;
120
121
122			again: switch (c = *fmt++) {
123			case '%': /* "%%" is converted to "%". */
124			literal:
125			if (c != *bp++)
126			return (NULL);
127
128			break;
129
130			/*
131			* "Alternative" modifiers. Just set the appropriate flag
132			* and start over again.
133			*/
134			case 'E': /* "%E?" alternative conversion modifier. */
135			_LEGAL_ALT(0);
136			alt_format \|= _ALT_E;
137			goto again;
138
139			case 'O': /* "%O?" alternative conversion modifier. */
140			_LEGAL_ALT(0);
141			alt_format \|= _ALT_O;
142			goto again;
143
144			/*
145			* "Complex" conversion rules, implemented through recursion.
146			*/
147			case 'c': /* Date and time, using the locale's format. */
148			_LEGAL_ALT(_ALT_E);
149			if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, 0)))
150			return (NULL);
151			break;
152
153			case 'D': /* The date as "%m/%d/%y". */
154			_LEGAL_ALT(0);
155			if (!(bp = _strptime(bp, "%m/%d/%y", tm, 0)))
156			return (NULL);
157			break;
158
159			case 'F': /* The date as "%Y-%m-%d". */
160			_LEGAL_ALT(0);
161			if (!(bp = _strptime(bp, "%Y-%m-%d", tm, 0)))
162			return (NULL);
163			continue;
164
165			case 'R': /* The time as "%H:%M". */
166			_LEGAL_ALT(0);
167			if (!(bp = _strptime(bp, "%H:%M", tm, 0)))
168			return (NULL);
169			break;
170
171			case 'r': /* The time as "%I:%M:%S %p". */
172			_LEGAL_ALT(0);
173			if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, 0)))
174			return (NULL);
175			break;
176
177			case 'T': /* The time as "%H:%M:%S". */
178			_LEGAL_ALT(0);
179			if (!(bp = _strptime(bp, "%H:%M:%S", tm, 0)))
180			return (NULL);
181			break;
182
183			case 'X': /* The time, using the locale's format. */
184			_LEGAL_ALT(_ALT_E);
185			if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, 0)))
186			return (NULL);
187			break;
188
189			case 'x': /* The date, using the locale's format. */
190			_LEGAL_ALT(_ALT_E);
191			if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, 0)))
192			return (NULL);
193			break;
194
195			/*
196			* "Elementary" conversion rules.
197			*/
198			case 'A': /* The day of week, using the locale's form. */
199			case 'a':
200			_LEGAL_ALT(0);
201			for (i = 0; i < 7; i++) {
202			/* Full name. */
203			len = strlen(_ctloc(day[i]));
204			if (strncasecmp(_ctloc(day[i]), bp, len) == 0)
205			break;
206
207			/* Abbreviated name. */
208			len = strlen(_ctloc(abday[i]));
209			if (strncasecmp(_ctloc(abday[i]), bp, len) == 0)
210			break;
211			}
212
213			/* Nothing matched. */
214			if (i == 7)
215			return (NULL);
216
217			tm->tm_wday = i;
218			bp += len;
219			fields \|= FIELD_TM_WDAY;
220			break;
221
222			case 'B': /* The month, using the locale's form. */
223			case 'b':
224			case 'h':
225			_LEGAL_ALT(0);
226			for (i = 0; i < 12; i++) {
227			/* Full name. */
228			len = strlen(_ctloc(mon[i]));
229			if (strncasecmp(_ctloc(mon[i]), bp, len) == 0)
230			break;
231
232			/* Abbreviated name. */
233			len = strlen(_ctloc(abmon[i]));
234			if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0)
235			break;
236			}
237
238			/* Nothing matched. */
239			if (i == 12)
240			return (NULL);
241
242			tm->tm_mon = i;
243			bp += len;
244			fields \|= FIELD_TM_MON;
245			break;
246
247			case 'C': /* The century number. */
248			_LEGAL_ALT(_ALT_E);
249			if (!(_conv_num(&bp, &i, 0, 99)))
250			return (NULL);
251
252			century = i * 100;
253			break;
254
255			case 'd': /* The day of month. */
256			case 'e':
257			_LEGAL_ALT(_ALT_O);
258			if (!(_conv_num(&bp, &tm->tm_mday, 1, 31)))
259			return (NULL);
260			fields \|= FIELD_TM_MDAY;
261			break;
262
263			case 'k': /* The hour (24-hour clock representation). */
264			_LEGAL_ALT(0);
265			/* FALLTHROUGH */
266			case 'H':
267			_LEGAL_ALT(_ALT_O);
268			if (!(_conv_num(&bp, &tm->tm_hour, 0, 23)))
269			return (NULL);
270			break;
271
272			case 'l': /* The hour (12-hour clock representation). */
273			_LEGAL_ALT(0);
274			/* FALLTHROUGH */
275			case 'I':
276			_LEGAL_ALT(_ALT_O);
277			if (!(_conv_num(&bp, &tm->tm_hour, 1, 12)))
278			return (NULL);
279			break;
280
281			case 'j': /* The day of year. */
282			_LEGAL_ALT(0);
283			if (!(_conv_num(&bp, &tm->tm_yday, 1, 366)))
284			return (NULL);
285			tm->tm_yday--;
286			fields \|= FIELD_TM_YDAY;
287			break;
288
289			case 'M': /* The minute. */
290			_LEGAL_ALT(_ALT_O);
291			if (!(_conv_num(&bp, &tm->tm_min, 0, 59)))
292			return (NULL);
293			break;
294
295			case 'm': /* The month. */
296			_LEGAL_ALT(_ALT_O);
297			if (!(_conv_num(&bp, &tm->tm_mon, 1, 12)))
298			return (NULL);
299			tm->tm_mon--;
300			fields \|= FIELD_TM_MON;
301			break;
302
303			case 'p': /* The locale's equivalent of AM/PM. */
304			_LEGAL_ALT(0);
305			/* AM? */
306			len = strlen(_ctloc(am_pm[0]));
307			if (strncasecmp(_ctloc(am_pm[0]), bp, len) == 0) {
308			if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */
309			return (NULL);
310			else if (tm->tm_hour == 12)
311			tm->tm_hour = 0;
312
313			bp += len;
314			break;
315			}
316			/* PM? */
317			len = strlen(_ctloc(am_pm[1]));
318			if (strncasecmp(_ctloc(am_pm[1]), bp, len) == 0) {
319			if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */
320			return (NULL);
321			else if (tm->tm_hour < 12)
322			tm->tm_hour += 12;
323
324			bp += len;
325			break;
326			}
327
328			/* Nothing matched. */
329			return (NULL);
330
331			case 'S': /* The seconds. */
332			_LEGAL_ALT(_ALT_O);
333			if (!(_conv_num(&bp, &tm->tm_sec, 0, 61)))
334			return (NULL);
335			break;
336
337			case 'U': /* The week of year, beginning on sunday. */
338			case 'W': /* The week of year, beginning on monday. */
339			_LEGAL_ALT(_ALT_O);
340			/*
341			* XXX This is bogus, as we can not assume any valid
342			* information present in the tm structure at this
343			* point to calculate a real value, so just check the
344			* range for now.
345			*/
346			if (!(_conv_num(&bp, &i, 0, 53)))
347			return (NULL);
348			break;
349
350			case 'w': /* The day of week, beginning on sunday. */
351			_LEGAL_ALT(_ALT_O);
352			if (!(_conv_num(&bp, &tm->tm_wday, 0, 6)))
353			return (NULL);
354			fields \|= FIELD_TM_WDAY;
355			break;
356
357			case 'u': /* The day of week, monday = 1. */
358			_LEGAL_ALT(_ALT_O);
359			if (!(_conv_num(&bp, &i, 1, 7)))
360			return (NULL);
361			tm->tm_wday = i % 7;
362			fields \|= FIELD_TM_WDAY;
363			continue;
364
365			case 'g': /* The year corresponding to the ISO week
366			* number but without the century.
367			*/
368			if (!(_conv_num(&bp, &i, 0, 99)))
369			return (NULL);
370			continue;
371
372			case 'G': /* The year corresponding to the ISO week
373			* number with century.
374			*/
375			do
376			bp++;
377			while (isdigit(*bp));
378			continue;
379
380			case 'V': /* The ISO 8601:1988 week number as decimal */
381			if (!(_conv_num(&bp, &i, 0, 53)))
382			return (NULL);
383			continue;
384
385			case 'Y': /* The year. */
386			_LEGAL_ALT(_ALT_E);
387			if (!(_conv_num(&bp, &i, 0, 9999)))
388			return (NULL);
389
390			relyear = -1;
391			tm->tm_year = i - TM_YEAR_BASE;
392			fields \|= FIELD_TM_YEAR;
393			break;
394
395			case 'y': /* The year within the century (2 digits). */
396			_LEGAL_ALT(_ALT_E \| _ALT_O);
397			if (!(_conv_num(&bp, &relyear, 0, 99)))
398			return (NULL);
399			break;
400
401			case 'Z':
402			tzset();
403			if (strncmp((const char *)bp, gmt, 3) == 0) {
404			tm->tm_isdst = 0;
405			#ifdef TM_GMTOFF
406			tm->TM_GMTOFF = 0;
407			#endif
408			#ifdef TM_ZONE
409			tm->TM_ZONE = gmt;
410			#endif
411			bp += 3;
412			} else if (strncmp((const char *)bp, utc, 3) == 0) {
413			tm->tm_isdst = 0;
414			#ifdef TM_GMTOFF
415			tm->TM_GMTOFF = 0;
416			#endif
417			#ifdef TM_ZONE
418			tm->TM_ZONE = utc;
419			#endif
420			bp += 3;
421			} else {
422			ep = _find_string(bp, &i,
423			(const char * const *)tzname,
424			NULL, 2);
425			if (ep == NULL)
426			return (NULL);
427
428			tm->tm_isdst = i;
429			#ifdef TM_GMTOFF
430			tm->TM_GMTOFF = -(timezone);
431			#endif
432			#ifdef TM_ZONE
433			tm->TM_ZONE = tzname[i];
434			#endif
435			bp = ep;
436			}
437			continue;
438
439			case 'z':
440			/*
441			* We recognize all ISO 8601 formats:
442			* Z = Zulu time/UTC
443			* [+-]hhmm
444			* [+-]hh:mm
445			* [+-]hh
446			* We recognize all RFC-822/RFC-2822 formats:
447			* UT\|GMT
448			* North American : UTC offsets
449			* E[DS]T = Eastern : -4 \| -5
450			* C[DS]T = Central : -5 \| -6
451			* M[DS]T = Mountain: -6 \| -7
452			* P[DS]T = Pacific : -7 \| -8
453			* Military
454			* [A-IL-M] = -1 ... -9 (J not used)
455			* [N-Y] = +1 ... +12
456			*/
457			while (isspace(*bp))
458			bp++;
459
460			switch (*bp++) {
461			case 'G':
462			if (*bp++ != 'M')
463			return NULL;
464			/FALLTHROUGH/
465			case 'U':
466			if (*bp++ != 'T')
467			return NULL;
468			/FALLTHROUGH/
469			case 'Z':
470			tm->tm_isdst = 0;
471			#ifdef TM_GMTOFF
472			tm->TM_GMTOFF = 0;
473			#endif
474			#ifdef TM_ZONE
475			tm->TM_ZONE = utc;
476			#endif
477			continue;
478			case '+':
479			neg = 0;
480			break;
481			case '-':
482			neg = 1;
483			break;
484			default:
485			--bp;
486			ep = _find_string(bp, &i, nast, NULL, 4);
487			if (ep != NULL) {
488			#ifdef TM_GMTOFF
489			tm->TM_GMTOFF = -5 - i;
490			#endif
491			#ifdef TM_ZONE
492			tm->TM_ZONE = (char *)nast[i];
493			#endif
494			bp = ep;
495			continue;
496			}
497			ep = _find_string(bp, &i, nadt, NULL, 4);
498			if (ep != NULL) {
499			tm->tm_isdst = 1;
500			#ifdef TM_GMTOFF
501			tm->TM_GMTOFF = -4 - i;
502			#endif
503			#ifdef TM_ZONE
504			tm->TM_ZONE = (char *)nadt[i];
505			#endif
506			bp = ep;
507			continue;
508			}
509
510			if ((bp >= 'A' && bp <= 'I') \|\|
511			(bp >= 'L' && bp <= 'Y')) {
512			#ifdef TM_GMTOFF
513			/* Argh! No 'J'! */
514			if (bp >= 'A' && bp <= 'I')
515			tm->TM_GMTOFF =
516			('A' - 1) - (int)*bp;
517			else if (bp >= 'L' && bp <= 'M')
518			tm->TM_GMTOFF = 'A' - (int)*bp;
519			else if (bp >= 'N' && bp <= 'Y')
520			tm->TM_GMTOFF = (int)*bp - 'M';
521			#endif
522			#ifdef TM_ZONE
523			tm->TM_ZONE = NULL; /* XXX */
524			#endif
525			bp++;
526			continue;
527			}
528			return NULL;
529			}
530			offs = 0;
531			for (i = 0; i < 4; ) {
532			if (isdigit(*bp)) {
533			offs = offs * 10 + (*bp++ - '0');
534			i++;
535			continue;
536			}
537			if (i == 2 && *bp == ':') {
538			bp++;
539			continue;
540			}
541			break;
542			}
543			switch (i) {
544			case 2:
545			offs *= 100;
546			break;
547			case 4:
548			i = offs % 100;
549			if (i >= 60)
550			return NULL;
551			/* Convert minutes into decimal */
552			offs = (offs / 100) * 100 + (i * 50) / 30;
553			break;
554			default:
555			return NULL;
556			}
557			if (neg)
558			offs = -offs;
559			tm->tm_isdst = 0; /* XXX */
560			#ifdef TM_GMTOFF
561			tm->TM_GMTOFF = offs;
562			#endif
563			#ifdef TM_ZONE
564			tm->TM_ZONE = NULL; /* XXX */
565			#endif
566			continue;
567
568			/*
569			* Miscellaneous conversions.
570			*/
571			case 'n': /* Any kind of white-space. */
572			case 't':
573			_LEGAL_ALT(0);
574			while (isspace(*bp))
575			bp++;
576			break;
577
578
579			default: /* Unknown/unsupported conversion. */
580			return (NULL);
581			}
582
583
584			}
585
586			/*
587			* We need to evaluate the two digit year spec (%y)
588			* last as we can get a century spec (%C) at any time.
589			*/
590			if (relyear != -1) {
591			if (century == TM_YEAR_BASE) {
592			if (relyear <= 68)
593			tm->tm_year = relyear + 2000 - TM_YEAR_BASE;
594			else
595			tm->tm_year = relyear + 1900 - TM_YEAR_BASE;
596			} else {
597			tm->tm_year = relyear + century - TM_YEAR_BASE;
598			}
599			fields \|= FIELD_TM_YEAR;
600			}
601
602			/* Compute some missing values when possible. */
603			if (fields & FIELD_TM_YEAR) {
604			const int year = tm->tm_year + TM_YEAR_BASE;
605			const int *mon_lens = mon_lengths[isleap(year)];
606			if (!(fields & FIELD_TM_YDAY) &&
607			(fields & FIELD_TM_MON) && (fields & FIELD_TM_MDAY)) {
608			tm->tm_yday = tm->tm_mday - 1;
609			for (i = 0; i < tm->tm_mon; i++)
610			tm->tm_yday += mon_lens[i];
611			fields \|= FIELD_TM_YDAY;
612			}
613			if (fields & FIELD_TM_YDAY) {
614			int days = tm->tm_yday;
615			if (!(fields & FIELD_TM_WDAY)) {
616			tm->tm_wday = EPOCH_WDAY +
617			((year - EPOCH_YEAR) % DAYSPERWEEK) *
618			(DAYSPERNYEAR % DAYSPERWEEK) +
619			leaps_thru_end_of(year - 1) -
620			leaps_thru_end_of(EPOCH_YEAR - 1) +
621			tm->tm_yday;
622			tm->tm_wday %= DAYSPERWEEK;
623			if (tm->tm_wday < 0)
624			tm->tm_wday += DAYSPERWEEK;
625			}
626			if (!(fields & FIELD_TM_MON)) {
627			tm->tm_mon = 0;
628			while (tm->tm_mon < MONSPERYEAR && days >= mon_lens[tm->tm_mon])
629			days -= mon_lens[tm->tm_mon++];
630			}
631			if (!(fields & FIELD_TM_MDAY))
632			tm->tm_mday = days + 1;
633			}
634			}
635
636			return ((char *)bp);
637			}
638
639
640			static int
641			_conv_num(const unsigned char *buf, int dest, int llim, int ulim)
642			{
643			int result = 0;
644			int rulim = ulim;
645
646			if (buf < '0' \|\| buf > '9')
647			return (0);
648
649			/* we use rulim to break out of the loop when we run out of digits */
650			do {
651			result *= 10;
652			result += (buf)++ - '0';
653			rulim /= 10;
654			} while ((result * 10 <= ulim) && rulim && buf >= '0' && buf <= '9');
655
656			if (result < llim \|\| result > ulim)
657			return (0);
658
659			*dest = result;
660			return (1);
661			}
662
663			static const u_char *
664			_find_string(const u_char bp, int tgt, const char * const *n1,
665			const char * const *n2, int c)
666			{
667			int i;
668			unsigned int len;
669
670			/* check full name - then abbreviated ones */
671			for (; n1 != NULL; n1 = n2, n2 = NULL) {
672			for (i = 0; i < c; i++, n1++) {
673			len = strlen(*n1);
674			if (strncasecmp(n1, (const char )bp, len) == 0) {
675			*tgt = i;
676			return bp + len;
677			}
678			}
679			}
680
681			/* Nothing matched */
682			return NULL;
683			}
684
685			static int
686			leaps_thru_end_of(const int y)
687			{
688			return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
689			-(leaps_thru_end_of(-(y + 1)) + 1);
690			}