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138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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#pragma prototyped
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/*
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* Glenn Fowler
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* AT&T Research
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*
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* Time_t conversion support
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*/
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#include <tmx.h>
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#include "FEATURE/tmlib"
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/*
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* convert Tm_t to Time_t
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*
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* if west==TM_LOCALZONE then the local timezone is used
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* otherwise west is the number of minutes west
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* of GMT with DST taken into account
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*
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* this routine works with a copy of Tm_t to avoid clashes
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* with other tm*() that may return static Tm_t*
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*/
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Time_t
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tmxtime(register Tm_t* tm, int west)
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{
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register Time_t t;
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register Tm_leap_t* lp;
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register int32_t y;
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int n;
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int sec;
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time_t now;
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struct tm* tl;
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Tm_t* to;
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Tm_t ts;
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ts = *tm;
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to = tm;
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tm = &ts;
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tmset(tm_info.zone);
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tmfix(tm);
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y = tm->tm_year;
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if (y < 69 || y > (TMX_MAXYEAR - 1900))
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return TMX_NOTIME;
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y--;
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t = y * 365 + y / 4 - y / 100 + (y + (1900 - 1600)) / 400 - (1970 - 1901) * 365 - (1970 - 1901) / 4;
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if ((n = tm->tm_mon) > 11)
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n = 11;
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y += 1901;
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if (n > 1 && tmisleapyear(y))
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t++;
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t += tm_data.sum[n] + tm->tm_mday - 1;
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t *= 24;
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t += tm->tm_hour;
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t *= 60;
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t += tm->tm_min;
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t *= 60;
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t += sec = tm->tm_sec;
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if (west != TM_UTCZONE && !(tm_info.flags & TM_UTC))
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{
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/*
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* time zone adjustments
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*/
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if (west == TM_LOCALZONE)
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{
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t += tm_info.zone->west * 60;
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if (!tm_info.zone->daylight)
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tm->tm_isdst = 0;
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else
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{
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y = tm->tm_year;
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tm->tm_year = tmequiv(tm) - 1900;
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now = tmxsec(tmxtime(tm, tm_info.zone->west));
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tm->tm_year = y;
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if (!(tl = tmlocaltime(&now)))
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return TMX_NOTIME;
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if (tm->tm_isdst = tl->tm_isdst)
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t += tm_info.zone->dst * 60;
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}
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}
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else
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{
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t += west * 60;
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if (!tm_info.zone->daylight)
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tm->tm_isdst = 0;
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else if (tm->tm_isdst < 0)
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{
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y = tm->tm_year;
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tm->tm_year = tmequiv(tm) - 1900;
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tm->tm_isdst = 0;
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now = tmxsec(tmxtime(tm, tm_info.zone->west));
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tm->tm_year = y;
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if (!(tl = tmlocaltime(&now)))
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return TMX_NOTIME;
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tm->tm_isdst = tl->tm_isdst;
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}
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}
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}
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else if (tm->tm_isdst)
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tm->tm_isdst = 0;
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*to = *tm;
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if (tm_info.flags & TM_LEAP)
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{
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/*
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* leap second adjustments
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*/
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for (lp = &tm_data.leap[0]; t < lp->time - (lp+1)->total; lp++);
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t += lp->total;
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n = lp->total - (lp+1)->total;
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if (t <= (lp->time + n) && (n > 0 && sec > 59 || n < 0 && sec > (59 + n) && sec <= 59))
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t -= n;
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}
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return tmxsns(t, tm->tm_nsec);
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}
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