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git://git.code.sf.net/p/cdesktopenv/code
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141 lines
3.7 KiB
C
141 lines
3.7 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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* return Tm_t for t
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* time zone and leap seconds accounted for in return value
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*/
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Tm_t*
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tmxtm(register Tm_t* tm, Time_t t, Tm_zone_t* zone)
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{
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register struct tm* tp;
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register Tm_leap_t* lp;
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Time_t x;
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time_t now;
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int leapsec;
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int y;
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uint32_t n;
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int32_t o;
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#if TMX_FLOAT
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Time_t z;
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uint32_t i;
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#endif
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tmset(tm_info.zone);
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leapsec = 0;
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if ((tm_info.flags & (TM_ADJUST|TM_LEAP)) == (TM_ADJUST|TM_LEAP) && (n = tmxsec(t)))
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{
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for (lp = &tm_data.leap[0]; n < lp->time; lp++);
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if (lp->total)
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{
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if (n == lp->time && (leapsec = (lp->total - (lp+1)->total)) < 0)
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leapsec = 0;
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t = tmxsns(n - lp->total, tmxnsec(t));
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}
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}
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x = tmxsec(t);
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if (!(tm->tm_zone = zone))
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{
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if (tm_info.flags & TM_UTC)
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tm->tm_zone = &tm_data.zone[2];
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else
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tm->tm_zone = tm_info.zone;
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}
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if ((o = 60 * tm->tm_zone->west) && x > o)
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{
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x -= o;
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o = 0;
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}
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#if TMX_FLOAT
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i = x / (24 * 60 * 60);
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z = i;
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n = x - z * (24 * 60 * 60);
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tm->tm_sec = n % 60 + leapsec;
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n /= 60;
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tm->tm_min = n % 60;
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n /= 60;
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tm->tm_hour = n % 24;
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#define x i
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#else
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tm->tm_sec = x % 60 + leapsec;
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x /= 60;
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tm->tm_min = x % 60;
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x /= 60;
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tm->tm_hour = x % 24;
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x /= 24;
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#endif
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tm->tm_wday = (x + 4) % 7;
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tm->tm_year = (400 * (x + 25202)) / 146097 + 1;
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n = tm->tm_year - 1;
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x -= n * 365 + n / 4 - n / 100 + (n + (1900 - 1600)) / 400 - (1970 - 1901) * 365 - (1970 - 1901) / 4;
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tm->tm_mon = 0;
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tm->tm_mday = x + 1;
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tm->tm_nsec = tmxnsec(t);
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tmfix(tm);
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n += 1900;
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tm->tm_isdst = 0;
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if (tm->tm_zone->daylight)
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{
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if ((y = tmequiv(tm) - 1900) == tm->tm_year)
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now = tmxsec(t);
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else
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{
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Tm_t te;
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te = *tm;
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te.tm_year = y;
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now = tmxsec(tmxtime(&te, tm->tm_zone->west));
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}
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if ((tp = tmlocaltime(&now)) && ((tm->tm_isdst = tp->tm_isdst) || o))
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{
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tm->tm_min -= o / 60 + (tm->tm_isdst ? tm->tm_zone->dst : 0);
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tmfix(tm);
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}
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}
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return tm;
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}
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/*
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* return Tm_t for t
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* time zone and leap seconds accounted for in return value
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*/
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Tm_t*
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tmxmake(Time_t t)
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{
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static Tm_t ts;
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return tmxtm(&ts, t, NiL);
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}
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