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/*	$NetBSD: strptime.c,v 1.62 2017/08/24 01:01:09 ginsbach Exp $	*/

/* http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/lib/libc/time/strptime.c?only_with_tag=HEAD

 * NetBSD implementation strptime().

 * Format description: https://netbsd.gw.com/cgi-bin/man-cgi?strptime+3+NetBSD-current

*/

/*-

 * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code was contributed to The NetBSD Foundation by Klaus Klein.

 * Heavily optimised by David Laight

 *

 * 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 <sys/cdefs.h>

//__RCSID("$NetBSD: strptime.c,v 1.62 2017/08/24 01:01:09 ginsbach Exp $");

#if defined(__MINGW32__) || defined(_MSC_VER)

#include <ctype.h>

#include <string.h>

#include <time.h>

#include <stdint.h>

static const unsigned char *conv_num(const unsigned char *, int *, unsigned int, unsigned int);

static const unsigned char *find_string(const unsigned char *, int *, const char * const *, const char * const *, int);

/*

 * 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 NULL; }

#define TM_YEAR_BASE	1900

#define TM_SUNDAY       0

#define TM_MONDAY       1

#define TM_TUESDAY      2

#define TM_WEDNESDAY    3

#define TM_THURSDAY     4

#define TM_FRIDAY       5

#define TM_SATURDAY     6

#define S_YEAR			(1 << 0)

#define S_MON			(1 << 1)

#define S_YDAY			(1 << 2)

#define S_MDAY			(1 << 3)

#define S_WDAY			(1 << 4)

#define S_HOUR			(1 << 5)

#define HAVE_MDAY(s)	(s & S_MDAY)

#define HAVE_MON(s)		(s & S_MON)

#define HAVE_WDAY(s)	(s & S_WDAY)

#define HAVE_YDAY(s)	(s & S_YDAY)

#define HAVE_YEAR(s)	(s & S_YEAR)

#define HAVE_HOUR(s)	(s & S_HOUR)

#define SECSPERMIN      60

#define MINSPERHOUR     60

#define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)

#define HOURSPERDAY     24

#define HERE_D_T_FMT    "%a %b %e %H:%M:%S %Y"

#define HERE_D_FMT      "%y/%m/%d"

#define HERE_T_FMT_AMPM "%I:%M:%S %p"

#define HERE_T_FMT      "%H:%M:%S"

#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))

/*

** Since everything in isleap is modulo 400 (or a factor of 400), we know that

**	isleap(y) == isleap(y % 400)

** and so

**	isleap(a + b) == isleap((a + b) % 400)

** or

**	isleap(a + b) == isleap(a % 400 + b % 400)

** This is true even if % means modulo rather than Fortran remainder

** (which is allowed by C89 but not by C99 or later).

** We use this to avoid addition overflow problems.

*/

#define isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)

#ifdef _MSC_VER

#define tzname              _tzname

#define strncasecmp         _strnicmp

#endif

#ifdef TM_ZONE

static char* utc = "UTC";

#endif

/* RFC-822/RFC-2822 */

static const char* const nast[] = {

       "EST",    "CST",    "MST",    "PST",    "\0\0\0"

};

static const char* const nadt[] = {

       "EDT",    "CDT",    "MDT",    "PDT",    "\0\0\0"

};

static const char* weekday_name[] =

{

    "Sunday", "Monday", "Tuesday", "Wednesday",

    "Thursday", "Friday", "Saturday"

};

static const char* ab_weekday_name[] =

{

    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"

};

static const char* month_name[] =

{

    "January", "February", "March", "April", "May", "June",

    "July", "August", "September", "October", "November", "December"

};

static const char* ab_month_name[] =

{

    "Jan", "Feb", "Mar", "Apr", "May", "Jun",

    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"

};

static const char* am_pm[] = {"AM", "PM"};

/*

 * Table to determine the ordinal date for the start of a month.

 * Ref: http://en.wikipedia.org/wiki/ISO_week_date

 */

static const int start_of_month[2][13] = {

    /* non-leap year */

    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },

    /* leap year */

    { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }

};

/*

 * Calculate the week day of the first day of a year. Valid for

 * the Gregorian calendar, which began Sept 14, 1752 in the UK

 * and its colonies. Ref:

 * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week

 */

static int

first_wday_of(int yr)

{

    return ((2 * (3 - (yr / 100) % 4)) + (yr % 100) + ((yr % 100) /  4) +

        (isleap(yr) ? 6 : 0) + 1) % 7;

}

#define delim(p)	((p) == '\0' || isspace((unsigned char)(p)))

static int

fromzone(const unsigned char **bp, struct tm *tm, int mandatory)

{

//    timezone_t tz;

    char buf[512], *p;

    const unsigned char *rp;

    for (p = buf, rp = *bp; !delim(*rp) && p < &buf[sizeof(buf) - 1]; rp++)

        *p++ = *rp;

    *p = '\0';

    if (mandatory)

        *bp = rp;

    if (!isalnum((unsigned char)*buf))

        return 0;

//    tz = tzalloc(buf);

//    if (tz == NULL)

//        return 0;

    *bp = rp;

    tm->tm_isdst = 0;	/* XXX */

#ifdef TM_GMTOFF

    tm->TM_GMTOFF = tzgetgmtoff(tz, tm->tm_isdst);

#endif

#ifdef TM_ZONE

    // Can't use tzgetname() here because we are going to free()

    tm->TM_ZONE = NULL; /* XXX */

#endif

//    tzfree(tz);

    return 1;

}

char* strptime(const char *buf, const char *fmt, struct tm *tm)

{

    unsigned char c;

    const unsigned char *bp, *ep, *zname;

    int alt_format, i, split_year = 0, neg = 0, state = 0,

        day_offset = -1, week_offset = 0, offs, mandatory;

    const char *new_fmt;

    bp = (const unsigned char *)buf;

    while (bp != NULL && (c = *fmt++) != '\0') {

        /* Clear `alternate' modifier prior to new conversion. */

        alt_format = 0;

        i = 0;

        /* Eat up white-space. */

        if (isspace(c)) {

            while (isspace(*bp))

                bp++;

            continue;

        }

        if (c != '%')

            goto literal;

again:		switch (c = *fmt++) {

        case '%':	/* "%%" is converted to "%". */

literal:

            if (c != *bp++)

                return NULL;

            LEGAL_ALT(0);

            continue;

        /*

         * "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. */

//            new_fmt = _TIME_LOCALE(loc)->d_t_fmt;

            new_fmt = HERE_D_T_FMT;

            state |= S_WDAY | S_MON | S_MDAY | S_YEAR;

            goto recurse;

        case 'F':	/* The date as "%Y-%m-%d". */

            new_fmt = "%Y-%m-%d";

            LEGAL_ALT(0);

            state |= S_MON | S_MDAY | S_YEAR;

            goto recurse;

        case 'R':	/* The time as "%H:%M". */

            new_fmt = "%H:%M";

            LEGAL_ALT(0);

            goto recurse;

        case 'r':	/* The time in 12-hour clock representation. */

//            new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm;

            new_fmt = HERE_T_FMT_AMPM;

            LEGAL_ALT(0);

            goto recurse;

        case 'X':	/* The time, using the locale's format. */

            /* fall through */

        case 'T':	/* The time as "%H:%M:%S". */

            new_fmt = HERE_T_FMT;

            LEGAL_ALT(0);

recurse:

            bp = (const unsigned char *)strptime((const char *)bp,

                                new_fmt, tm);

            LEGAL_ALT(ALT_E);

            continue;

        case 'x':	/* The date, using the locale's format. */

            /* fall throug */

        case 'D':	/* The date as "%y/%m/%d". */

        {

	    int year;

            new_fmt = HERE_D_FMT;

            LEGAL_ALT(0);

            state |= S_MON | S_MDAY | S_YEAR;

            year = split_year ? tm->tm_year : 0;

            bp = (const unsigned char *)strptime((const char *)bp,

                                new_fmt, tm);

            LEGAL_ALT(ALT_E);

            tm->tm_year += year;

            if (split_year && tm->tm_year % (2000 - TM_YEAR_BASE) <= 68)

                tm->tm_year -= 2000 - TM_YEAR_BASE;

            split_year = 1;

            continue;

        }

        /*

         * "Elementary" conversion rules.

         */

        case 'A':	/* The day of week, using the locale's form. */

        case 'a':

            bp = find_string(bp, &tm->tm_wday, weekday_name, ab_weekday_name, 7);

            LEGAL_ALT(0);

            state |= S_WDAY;

            continue;

        case 'B':	/* The month, using the locale's form. */

        case 'b':

        case 'h':

            bp = find_string(bp, &tm->tm_mon, month_name, ab_month_name, 12);

            LEGAL_ALT(0);

            state |= S_MON;

            continue;

        case 'C':	/* The century number. */

            i = 20;

            bp = conv_num(bp, &i, 0, 99);

            i = i * 100 - TM_YEAR_BASE;

            if (split_year)

                i += tm->tm_year % 100;

            split_year = 1;

            tm->tm_year = i;

            LEGAL_ALT(ALT_E);

            state |= S_YEAR;

            continue;

        case 'd':	/* The day of month. */

        case 'e':

            bp = conv_num(bp, &tm->tm_mday, 1, 31);

            LEGAL_ALT(ALT_O);

            state |= S_MDAY;

            continue;

        case 'k':	/* The hour (24-hour clock representation). */

            LEGAL_ALT(0);

            /* FALLTHROUGH */

        case 'H':

            bp = conv_num(bp, &tm->tm_hour, 0, 23);

            LEGAL_ALT(ALT_O);

            state |= S_HOUR;

            continue;

        case 'l':	/* The hour (12-hour clock representation). */

            LEGAL_ALT(0);

            /* FALLTHROUGH */

        case 'I':

            bp = conv_num(bp, &tm->tm_hour, 1, 12);

            if (tm->tm_hour == 12)

                tm->tm_hour = 0;

            LEGAL_ALT(ALT_O);

            state |= S_HOUR;

            continue;

        case 'j':	/* The day of year. */

            i = 1;

            bp = conv_num(bp, &i, 1, 366);

            tm->tm_yday = i - 1;

            LEGAL_ALT(0);

            state |= S_YDAY;

            continue;

        case 'M':	/* The minute. */

            bp = conv_num(bp, &tm->tm_min, 0, 59);

            LEGAL_ALT(ALT_O);

            continue;

        case 'm':	/* The month. */

            i = 1;

            bp = conv_num(bp, &i, 1, 12);

            tm->tm_mon = i - 1;

            LEGAL_ALT(ALT_O);

            state |= S_MON;

            continue;

        case 'p':	/* The locale's equivalent of AM/PM. */

            bp = find_string(bp, &i, am_pm, NULL, 2);

            if (HAVE_HOUR(state) && tm->tm_hour > 11)

                return NULL;

            tm->tm_hour += i * 12;

            LEGAL_ALT(0);

            continue;

        case 'S':	/* The seconds. */

            bp = conv_num(bp, &tm->tm_sec, 0, 61);

            LEGAL_ALT(ALT_O);

            continue;

#ifndef TIME_MAX

#ifdef _MSC_VER

#define TIME_MAX	INT32_MAX

#else

#define TIME_MAX	INT64_MAX

#endif

#endif

        case 's':	/* seconds since the epoch */

            {

                time_t sse = 0;

#ifdef _MSC_VER

                uint32_t rulim = TIME_MAX;

#else

                uint64_t rulim = TIME_MAX;

#endif

                if (*bp < '0' || *bp > '9') {

                    bp = NULL;

                    continue;

                }

                do {

                    sse *= 10;

                    sse += *bp++ - '0';

                    rulim /= 10;

                } while ((sse * 10 <= TIME_MAX) &&

                     rulim && *bp >= '0' && *bp <= '9');

#ifdef _MSC_VER

                if (sse < 0 || (uint32_t)sse > TIME_MAX) {

#else

                if (sse < 0 || (uint64_t)sse > TIME_MAX) {

#endif

                    bp = NULL;

                    continue;

                }

#ifdef _WIN32

#ifdef _MSC_VER

		if (1)

#else

                if (localtime_s(tm, &sse) == 0)

#endif

#else

                if (localtime_r(&sse, tm))

#endif

                    state |= S_YDAY | S_WDAY | S_MON | S_MDAY | S_YEAR;

                else

                    bp = NULL;

            }

            continue;

        case 'U':	/* The week of year, beginning on sunday. */

        case 'W':	/* The week of year, beginning on monday. */

            /*

             * 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 save the

             * week for now in case it can be used later.

             */

            bp = conv_num(bp, &i, 0, 53);

            LEGAL_ALT(ALT_O);

            if (c == 'U')

                day_offset = TM_SUNDAY;

            else

                day_offset = TM_MONDAY;

            week_offset = i;

            continue;

        case 'w':	/* The day of week, beginning on sunday. */

            bp = conv_num(bp, &tm->tm_wday, 0, 6);

            LEGAL_ALT(ALT_O);

            state |= S_WDAY;

            continue;

        case 'u':	/* The day of week, monday = 1. */

            bp = conv_num(bp, &i, 1, 7);

            tm->tm_wday = i % 7;

            LEGAL_ALT(ALT_O);

            state |= S_WDAY;

            continue;

        case 'g':	/* The year corresponding to the ISO week

                 * number but without the century.

                 */

            bp = conv_num(bp, &i, 0, 99);

            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 */

            bp = conv_num(bp, &i, 0, 53);

            continue;

        case 'Y':	/* The year. */

            i = TM_YEAR_BASE;	/* just for data sanity... */

            bp = conv_num(bp, &i, 0, 9999);

            tm->tm_year = i - TM_YEAR_BASE;

            LEGAL_ALT(ALT_E);

            state |= S_YEAR;

            continue;

        case 'y':	/* The year within 100 years of the epoch. */

            /* LEGAL_ALT(ALT_E | ALT_O); */

            bp = conv_num(bp, &i, 0, 99);

            if (split_year)

                /* preserve century */

                i += (tm->tm_year / 100) * 100;

            else {

                split_year = 1;

                if (i <= 68)

                    i = i + 2000 - TM_YEAR_BASE;

            }

            tm->tm_year = i;

            state |= S_YEAR;

            continue;

        case 'Z':       // time zone name

        case 'z':       //

#ifdef _WIN32

            _tzset();

#else

            tzset();

#endif

            mandatory = c == '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

             *          Nautical/Military

             * [A-IL-M] = -1 ... -9 (J not used)

             * [N-Y]  = +1 ... +12

             * Note: J maybe used to denote non-nautical

             *       local time

             */

            if (mandatory)

                while (isspace(*bp))

                    bp++;

            zname = bp;

            switch (*bp++) {

            case 'G':

                if (*bp++ != 'M')

                    goto namedzone;

                /*FALLTHROUGH*/

            case 'U':

                if (*bp++ != 'T')

                    goto namedzone;

                else if (!delim(*bp) && *bp++ != 'C')

                    goto namedzone;

                /*FALLTHROUGH*/

            case 'Z':

                if (!delim(*bp))

                    goto namedzone;

                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:

namedzone:

                bp = zname;

                /* Nautical / Military style */

                if (delim(bp[1]) &&

                    ((*bp >= 'A' && *bp <= 'I') ||

                     (*bp >= 'L' && *bp <= 'Y'))) {

#ifdef TM_GMTOFF

                    /* Argh! No 'J'! */

                    if (*bp >= 'A' && *bp <= 'I')

                        tm->TM_GMTOFF =

                            (int)*bp - ('A' - 1);

                    else if (*bp >= 'L' && *bp <= 'M')

                        tm->TM_GMTOFF = (int)*bp - 'A';

                    else if (*bp >= 'N' && *bp <= 'Y')

                        tm->TM_GMTOFF = 'M' - (int)*bp;

                    tm->TM_GMTOFF *= SECSPERHOUR;

#endif

#ifdef TM_ZONE

                    tm->TM_ZONE = NULL; /* XXX */

#endif

                    bp++;

                    continue;

                }

                /* 'J' is local time */

                if (delim(bp[1]) && *bp == 'J') {

#ifdef TM_GMTOFF

                    tm->TM_GMTOFF = -timezone;

#endif

#ifdef TM_ZONE

                    tm->TM_ZONE = NULL; /* XXX */

#endif

                    bp++;

                    continue;

                }

                /*

                 * From our 3 letter hard-coded table

                 * XXX: Can be removed, handled by tzload()

                 */

                if (delim(bp[0]) || delim(bp[1]) ||

                    delim(bp[2]) || !delim(bp[3]))

                    goto loadzone;

                ep = find_string(bp, &i, nast, NULL, 4);

                if (ep != NULL) {

#ifdef TM_GMTOFF

                    tm->TM_GMTOFF = (-5 - i) * SECSPERHOUR;

#endif

#ifdef TM_ZONE

                    tm->TM_ZONE = __UNCONST(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) * SECSPERHOUR;

#endif

#ifdef TM_ZONE

                    tm->TM_ZONE = __UNCONST(nadt[i]);

#endif

                    bp = ep;

                    continue;

                }

                /*

                 * Our current timezone

                 */

                ep = find_string(bp, &i,

                             (const char * const *)NULL,

                              NULL, 2);

                if (ep != 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;

                }

loadzone:

                /*

                 * The hard way, load the zone!

                 */

                if (fromzone(&bp, tm, mandatory))

                    continue;

                goto out;

            }

            offs = 0;

            for (i = 0; i < 4; ) {

                if (isdigit(*bp)) {

                    offs = offs * 10 + (*bp++ - '0');

                    i++;

                    continue;

                }

                if (i == 2 && *bp == ':') {

                    bp++;

                    continue;

                }

                break;

            }

            if (isdigit(*bp))

                goto out;

            switch (i) {

            case 2:

                offs *= SECSPERHOUR;

                break;

            case 4:

                i = offs % 100;

                offs /= 100;

                if (i >= SECSPERMIN)

                    goto out;

                /* Convert minutes into decimal */

                offs = offs * SECSPERHOUR + i * SECSPERMIN;

                break;

            default:

out:

                if (mandatory)

                    return NULL;

                bp = zname;

                continue;

            }

            /* ISO 8601 & RFC 3339 limit to 23:59 max */

            if (offs >= (HOURSPERDAY * SECSPERHOUR))

                goto out;

            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':

            while (isspace(*bp))

                bp++;

            LEGAL_ALT(0);

            continue;

        default:	/* Unknown/unsupported conversion. */

            return NULL;

        }

    }

    if (!HAVE_YDAY(state) && HAVE_YEAR(state)) {

        if (HAVE_MON(state) && HAVE_MDAY(state)) {

            /* calculate day of year (ordinal date) */

            tm->tm_yday =  start_of_month[isleap_sum(tm->tm_year,

                TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);

            state |= S_YDAY;

        } else if (day_offset != -1) {

            /*

             * Set the date to the first Sunday (or Monday)

             * of the specified week of the year.

             */

            if (!HAVE_WDAY(state)) {

                tm->tm_wday = day_offset;

                state |= S_WDAY;

            }

            tm->tm_yday = (7 -

                first_wday_of(tm->tm_year + TM_YEAR_BASE) +

                day_offset) % 7 + (week_offset - 1) * 7 +

                tm->tm_wday  - day_offset;

            state |= S_YDAY;

        }

    }

    if (HAVE_YDAY(state) && HAVE_YEAR(state)) {

        int isleap;

        if (!HAVE_MON(state)) {

            /* calculate month of day of year */

            i = 0;

            isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);

            while (tm->tm_yday >= start_of_month[isleap][i])

                i++;

            if (i > 12) {

                i = 1;

                tm->tm_yday -= start_of_month[isleap][12];

                tm->tm_year++;

            }

            tm->tm_mon = i - 1;

            state |= S_MON;

        }

        if (!HAVE_MDAY(state)) {

            /* calculate day of month */

            isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE);

            tm->tm_mday = tm->tm_yday -

                start_of_month[isleap][tm->tm_mon] + 1;

            state |= S_MDAY;

        }

        if (!HAVE_WDAY(state)) {

            /* calculate day of week */

            i = 0;

            week_offset = first_wday_of(tm->tm_year);

            while (i++ <= tm->tm_yday) {

                if (week_offset++ >= 6)

                    week_offset = 0;