lighttpd 1.4.x
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163 lines
5.7 KiB
163 lines
5.7 KiB
/* |
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* sys-time.h - time.h wrapper for localtime_r() and gmtime_r() |
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* |
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* Copyright(c) 2015 Glenn Strauss gstrauss()gluelogic.com All rights reserved |
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* License: BSD 3-clause (same as lighttpd) |
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*/ |
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#ifndef LI_SYS_TIME_H |
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#define LI_SYS_TIME_H |
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#include "first.h" |
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#ifdef HAVE_SYS_TIME_H |
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#include <sys/time.h>/* gettimeofday() */ |
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#endif |
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#include <time.h> /* time() localtime_r() gmtime_r() strftime() */ |
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/*(provide rudimentary localtime_r() and gmtime_r() for platforms lacking) |
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*(Note that 'result' preprocessor arg is repeated, so callers should avoid |
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* side-effects. Also note that there is still a race condition before the |
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* result of localtime()/gmtime() is copied. In any case, this exists here |
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* so that the rest of the code can use localtime_r() and gmtime_r() syntax. |
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* Platforms requiring thread-safety and lacking localtime_r() or gmtime_r() |
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* could turn these into subroutines which take a local mutex to protect the |
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* calls to localtime() or gmtime()) */ |
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#ifndef HAVE_LOCALTIME_R |
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#define localtime_r(timep,result) ((*(result) = *(localtime(timep))), (result)) |
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#endif |
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#ifndef HAVE_GMTIME_R |
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#define gmtime_r(timep,result) ((*(result) = *(gmtime(timep))), (result)) |
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#endif |
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#ifndef HAVE_TIMEGM |
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#ifdef _WIN32 |
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#define timegm(tm) _mkgmtime(tm) |
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#else |
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__attribute_pure__ |
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static inline time_t |
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timegm (const struct tm * const tm); |
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static inline time_t |
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timegm (const struct tm * const tm) |
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{ |
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int y = tm->tm_year + 1900; |
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int m = tm->tm_mon + 1; |
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int d = tm->tm_mday; |
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/* days_from_civil() http://howardhinnant.github.io/date_algorithms.html */ |
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y -= m <= 2; |
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int era = y / 400; |
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int yoe = y - era * 400; // [0, 399] |
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int doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1; // [0, 365] |
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int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy; // [0, 146096] |
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int days_since_1970 = era * 146097 + doe - 719468; |
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return 60*(60*(24L*days_since_1970+tm->tm_hour)+tm->tm_min)+tm->tm_sec; |
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} |
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#endif |
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#endif |
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/* non-standard functions created for lighttpd for Y2038 problem |
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* reference: https://en.wikipedia.org/wiki/Year_2038_problem |
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* |
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* lighttpd does not expect to deal with dates earlier than 1970, |
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* and can therefore treat dates earlier than 1970 as having overflowed |
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* 32-bit signed time_t, signifying dates after Tue, 19 Jan 2038 03:14:07 GMT |
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* |
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* 1954, 1982, 2010, 2038 begin on Thu and are two years offset from leap year. |
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* Attempt to adjust a timestamp > INT32_MAX back to a similar year, starting on |
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* same weekday, and being same distance from next leap year; use gmtime_r() |
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* or localtime_r(); and then adjust tm.tm_year back to the year of the original |
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* timestamp. (Note that the calculations here are valid for the specific range |
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* of input timestamps mapped to 1970 and 2099. The year 2000 was a leap year, |
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* so crossing 2000 *does not* require special-casing here, but the year 2100 |
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* *is not* a leap year in the Gregorian calendar, so this code is not valid |
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* after 28 Feb 2100. Since the max validity of these kludges could only be |
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* until 7 Feb 2106, this code has chosen not to special-case 2100-2106 and |
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* produces incorrect results after 28 Feb 2100.) |
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*/ |
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#if HAS_TIME_BITS64 |
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#define gmtime64_r(timep,result) gmtime_r((timep),(result)) |
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#define localtime64_r(timep,result) localtime_r((timep),(result)) |
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#else /* !HAS_TIME_BITS64 */ |
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#define gmtime64_r(timep,result) gmtime_y2038_kludge32(*(timep),(result)) |
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#define localtime64_r(timep,result) localtime_y2038_kludge32(*(timep),(result)) |
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static inline struct tm * |
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gmtime_y2038_kludge32 (unix_time64_t t, struct tm *result); |
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static inline struct tm * |
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gmtime_y2038_kludge32 (unix_time64_t t, struct tm *result) |
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{ |
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if ((uint64_t)t <= INT32_MAX) { |
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time_t tt = (time_t)t; |
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return gmtime_r(&tt, result); |
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} |
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else { |
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/*(treat negative time as having overflowed 32-bit time_t)*/ |
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if (t < 0) |
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t = TIME64_CAST(t); |
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time_t tt = (time_t)(t - 2650838400LL); |
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if (gmtime_r(&tt, result)) { |
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result->tm_year += 84; |
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return result; |
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} |
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else if (t < 3914709247LL) { |
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/*(ok through Tue, 19 Jan 2094 03:14:07 GMT)*/ |
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tt = (time_t)(t - 1767225600LL); |
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if (gmtime_r(&tt, result)) { |
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result->tm_year += 56; |
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return result; |
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} |
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} |
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/*(choose to forever return gmtime_r() equivalent of |
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* Thu, 01 Jan 1970 00:00:00 GMT) |
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*(returning NULL not expected by lighttpd and might crash)*/ |
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tt = 0; |
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gmtime_r(&tt, result); |
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return result; |
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} |
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} |
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static inline struct tm * |
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localtime_y2038_kludge32 (unix_time64_t t, struct tm *result); |
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static inline struct tm * |
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localtime_y2038_kludge32 (unix_time64_t t, struct tm *result) |
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{ |
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if ((uint64_t)t <= INT32_MAX) { |
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time_t tt = (time_t)t; |
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return localtime_r(&tt, result); |
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} |
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else { |
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/*(treat negative time as having overflowed 32-bit time_t)*/ |
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if (t < 0) |
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t = TIME64_CAST(t); |
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time_t tt = (time_t)(t - 2650838400LL); |
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if (localtime_r(&tt, result)) { |
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result->tm_year += 84; |
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return result; |
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} |
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else if (t < 3914709247LL) { |
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/*(ok through Tue, 19 Jan 2094 03:14:07 GMT)*/ |
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tt = (time_t)(t - 1767225600LL); |
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if (localtime_r(&tt, result)) { |
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result->tm_year += 56; |
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return result; |
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} |
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} |
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/*(choose to forever return localtime_r() equivalent of |
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* Thu, 01 Jan 1970 00:00:00 GMT) |
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*(returning NULL not expected by lighttpd and might crash)*/ |
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tt = 0; |
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localtime_r(&tt, result); |
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return result; |
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} |
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} |
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#endif /* !HAS_TIME_BITS64 */ |
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#endif
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