Rev 4921 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * localtime_r.c |
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| 6099 | serge | 3 | * Original Author: Adapted from tzcode maintained by Arthur David Olson. |
| 4 | * Modifications: |
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| 5 | * - Changed to mktm_r and added __tzcalc_limits - 04/10/02, Jeff Johnston |
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| 6 | * - Fixed bug in mday computations - 08/12/04, Alex Mogilnikov |
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| 7 | * - Fixed bug in __tzcalc_limits - 08/12/04, Alex Mogilnikov |
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| 8 | * - Implement localtime_r() with gmtime_r() and the conditional code moved |
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| 9 | * from _mktm_r() - 05/09/14, Freddie Chopin |
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| 4349 | Serge | 10 | * |
| 11 | * Converts the calendar time pointed to by tim_p into a broken-down time |
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| 12 | * expressed as local time. Returns a pointer to a structure containing the |
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| 13 | * broken-down time. |
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| 14 | */ |
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| 15 | |||
| 16 | #include "local.h" |
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| 17 | |||
| 18 | struct tm * |
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| 19 | _DEFUN (localtime_r, (tim_p, res), |
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| 4921 | Serge | 20 | _CONST time_t *__restrict tim_p _AND |
| 21 | struct tm *__restrict res) |
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| 4349 | Serge | 22 | { |
| 6099 | serge | 23 | long offset; |
| 24 | int hours, mins, secs; |
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| 25 | int year; |
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| 26 | __tzinfo_type *_CONST tz = __gettzinfo (); |
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| 27 | _CONST int *ip; |
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| 28 | |||
| 29 | res = gmtime_r (tim_p, res); |
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| 30 | |||
| 31 | year = res->tm_year + YEAR_BASE; |
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| 32 | ip = __month_lengths[isleap(year)]; |
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| 33 | |||
| 34 | TZ_LOCK; |
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| 35 | _tzset_unlocked (); |
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| 36 | if (_daylight) |
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| 37 | { |
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| 38 | if (year == tz->__tzyear || __tzcalc_limits (year)) |
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| 39 | res->tm_isdst = (tz->__tznorth |
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| 40 | ? (*tim_p >= tz->__tzrule[0].change |
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| 41 | && *tim_p < tz->__tzrule[1].change) |
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| 42 | : (*tim_p >= tz->__tzrule[0].change |
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| 43 | || *tim_p < tz->__tzrule[1].change)); |
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| 44 | else |
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| 45 | res->tm_isdst = -1; |
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| 46 | } |
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| 47 | else |
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| 48 | res->tm_isdst = 0; |
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| 49 | |||
| 50 | offset = (res->tm_isdst == 1 |
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| 51 | ? tz->__tzrule[1].offset |
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| 52 | : tz->__tzrule[0].offset); |
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| 53 | |||
| 54 | hours = (int) (offset / SECSPERHOUR); |
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| 55 | offset = offset % SECSPERHOUR; |
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| 56 | |||
| 57 | mins = (int) (offset / SECSPERMIN); |
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| 58 | secs = (int) (offset % SECSPERMIN); |
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| 59 | |||
| 60 | res->tm_sec -= secs; |
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| 61 | res->tm_min -= mins; |
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| 62 | res->tm_hour -= hours; |
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| 63 | |||
| 64 | if (res->tm_sec >= SECSPERMIN) |
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| 65 | { |
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| 66 | res->tm_min += 1; |
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| 67 | res->tm_sec -= SECSPERMIN; |
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| 68 | } |
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| 69 | else if (res->tm_sec < 0) |
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| 70 | { |
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| 71 | res->tm_min -= 1; |
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| 72 | res->tm_sec += SECSPERMIN; |
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| 73 | } |
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| 74 | if (res->tm_min >= MINSPERHOUR) |
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| 75 | { |
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| 76 | res->tm_hour += 1; |
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| 77 | res->tm_min -= MINSPERHOUR; |
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| 78 | } |
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| 79 | else if (res->tm_min < 0) |
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| 80 | { |
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| 81 | res->tm_hour -= 1; |
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| 82 | res->tm_min += MINSPERHOUR; |
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| 83 | } |
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| 84 | if (res->tm_hour >= HOURSPERDAY) |
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| 85 | { |
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| 86 | ++res->tm_yday; |
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| 87 | ++res->tm_wday; |
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| 88 | if (res->tm_wday > 6) |
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| 89 | res->tm_wday = 0; |
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| 90 | ++res->tm_mday; |
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| 91 | res->tm_hour -= HOURSPERDAY; |
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| 92 | if (res->tm_mday > ip[res->tm_mon]) |
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| 93 | { |
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| 94 | res->tm_mday -= ip[res->tm_mon]; |
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| 95 | res->tm_mon += 1; |
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| 96 | if (res->tm_mon == 12) |
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| 97 | { |
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| 98 | res->tm_mon = 0; |
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| 99 | res->tm_year += 1; |
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| 100 | res->tm_yday = 0; |
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| 101 | } |
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| 102 | } |
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| 103 | } |
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| 104 | else if (res->tm_hour < 0) |
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| 105 | { |
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| 106 | res->tm_yday -= 1; |
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| 107 | res->tm_wday -= 1; |
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| 108 | if (res->tm_wday < 0) |
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| 109 | res->tm_wday = 6; |
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| 110 | res->tm_mday -= 1; |
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| 111 | res->tm_hour += 24; |
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| 112 | if (res->tm_mday == 0) |
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| 113 | { |
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| 114 | res->tm_mon -= 1; |
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| 115 | if (res->tm_mon < 0) |
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| 116 | { |
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| 117 | res->tm_mon = 11; |
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| 118 | res->tm_year -= 1; |
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| 119 | res->tm_yday = 364 + isleap(res->tm_year + YEAR_BASE); |
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| 120 | } |
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| 121 | res->tm_mday = ip[res->tm_mon]; |
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| 122 | } |
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| 123 | } |
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| 124 | TZ_UNLOCK; |
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| 125 | |||
| 126 | return (res); |
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| 4349 | Serge | 127 | } |