diff options
Diffstat (limited to 'usr/src/lib/libast/common/tm/tmxtime.c')
| -rw-r--r-- | usr/src/lib/libast/common/tm/tmxtime.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/usr/src/lib/libast/common/tm/tmxtime.c b/usr/src/lib/libast/common/tm/tmxtime.c new file mode 100644 index 0000000000..262d893317 --- /dev/null +++ b/usr/src/lib/libast/common/tm/tmxtime.c @@ -0,0 +1,137 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * Glenn Fowler + * AT&T Research + * + * Time_t conversion support + */ + +#include <tmx.h> + +#include "FEATURE/tmlib" + +/* + * convert Tm_t to Time_t + * + * if west==TM_LOCALZONE then the local timezone is used + * otherwise west is the number of minutes west + * of GMT with DST taken into account + * + * this routine works with a copy of Tm_t to avoid clashes + * with other tm*() that may return static Tm_t* + */ + +Time_t +tmxtime(register Tm_t* tm, int west) +{ + register Time_t t; + register Tm_leap_t* lp; + register int32_t y; + int n; + int sec; + time_t now; + struct tm* tl; + Tm_t* to; + Tm_t ts; + + ts = *tm; + to = tm; + tm = &ts; + tmset(tm_info.zone); + tmfix(tm); + y = tm->tm_year; + if (y < 69 || y > (TMX_MAXYEAR - 1900)) + return TMX_NOTIME; + y--; + t = y * 365 + y / 4 - y / 100 + (y + (1900 - 1600)) / 400 - (1970 - 1901) * 365 - (1970 - 1901) / 4; + if ((n = tm->tm_mon) > 11) + n = 11; + y += 1901; + if (n > 1 && tmisleapyear(y)) + t++; + t += tm_data.sum[n] + tm->tm_mday - 1; + t *= 24; + t += tm->tm_hour; + t *= 60; + t += tm->tm_min; + t *= 60; + t += sec = tm->tm_sec; + if (west != TM_UTCZONE && !(tm_info.flags & TM_UTC)) + { + /* + * time zone adjustments + */ + + if (west == TM_LOCALZONE) + { + t += tm_info.zone->west * 60; + if (!tm_info.zone->daylight) + tm->tm_isdst = 0; + else + { + y = tm->tm_year; + tm->tm_year = tmequiv(tm) - 1900; + now = tmxsec(tmxtime(tm, tm_info.zone->west)); + tm->tm_year = y; + if (!(tl = tmlocaltime(&now))) + return TMX_NOTIME; + if (tm->tm_isdst = tl->tm_isdst) + t += tm_info.zone->dst * 60; + } + } + else + { + t += west * 60; + if (!tm_info.zone->daylight) + tm->tm_isdst = 0; + else if (tm->tm_isdst < 0) + { + y = tm->tm_year; + tm->tm_year = tmequiv(tm) - 1900; + tm->tm_isdst = 0; + now = tmxsec(tmxtime(tm, tm_info.zone->west)); + tm->tm_year = y; + if (!(tl = tmlocaltime(&now))) + return TMX_NOTIME; + tm->tm_isdst = tl->tm_isdst; + } + } + } + else if (tm->tm_isdst) + tm->tm_isdst = 0; + *to = *tm; + if (tm_info.flags & TM_LEAP) + { + /* + * leap second adjustments + */ + + for (lp = &tm_data.leap[0]; t < lp->time - (lp+1)->total; lp++); + t += lp->total; + n = lp->total - (lp+1)->total; + if (t <= (lp->time + n) && (n > 0 && sec > 59 || n < 0 && sec > (59 + n) && sec <= 59)) + t -= n; + } + return tmxsns(t, tm->tm_nsec); +} |