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/* * The MIT License (MIT) * * Copyright (c) 2015-2019 Derick Rethans * Copyright (c) 2018 MongoDB, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef __TIMELIB_H__ #define __TIMELIB_H__ #ifdef HAVE_TIMELIB_CONFIG_H # include "timelib_config.h" #endif #include <stdlib.h> #include <stdbool.h> #include <limits.h> #include <inttypes.h> # ifndef HAVE_INT32_T # if SIZEOF_INT == 4 typedef int int32_t; # elif SIZEOF_LONG == 4 typedef long int int32_t; # endif # endif # ifndef HAVE_UINT32_T # if SIZEOF_INT == 4 typedef unsigned int uint32_t; # elif SIZEOF_LONG == 4 typedef unsigned long int uint32_t; # endif # endif #ifdef _WIN32 # if _MSC_VER >= 1600 # include <stdint.h> # endif # ifndef SIZEOF_INT # define SIZEOF_INT 4 # endif # ifndef SIZEOF_LONG # define SIZEOF_LONG 4 # endif # ifndef int32_t typedef __int32 int32_t; # endif # ifndef uint32_t typedef unsigned __int32 uint32_t; # endif # ifndef int64_t typedef __int64 int64_t; # endif # ifndef uint64_t typedef unsigned __int64 uint64_t; # endif # ifndef PRId32 # define PRId32 "I32d" # endif # ifndef PRIu32 # define PRIu32 "I32u" # endif # ifndef PRId64 # define PRId64 "I64d" # endif # ifndef PRIu64 # define PRIu64 "I64u" # endif # ifndef INT32_MAX #define INT32_MAX _I32_MAX # endif # ifndef INT32_MIN #define INT32_MIN ((int32_t)_I32_MIN) # endif # ifndef UINT32_MAX #define UINT32_MAX _UI32_MAX # endif # ifndef INT64_MIN #define INT64_MIN ((int64_t)_I64_MIN) # endif # ifndef INT64_MAX #define INT64_MAX _I64_MAX # endif # ifndef UINT64_MAX #define UINT64_MAX _UI64_MAX # endif #endif #if (defined(__x86_64__) || defined(__LP64__) || defined(_LP64) || defined(_WIN64)) && !defined(TIMELIB_FORCE_LONG32) typedef int64_t timelib_long; typedef uint64_t timelib_ulong; # define TIMELIB_LONG_MAX INT64_MAX # define TIMELIB_LONG_MIN INT64_MIN # define TIMELIB_ULONG_MAX UINT64_MAX # define TIMELIB_LONG_FMT "%" PRId64 # define TIMELIB_ULONG_FMT "%" PRIu64 #else typedef int32_t timelib_long; typedef uint32_t timelib_ulong; # define TIMELIB_LONG_MAX INT32_MAX # define TIMELIB_LONG_MIN INT32_MIN # define TIMELIB_ULONG_MAX UINT32_MAX # define TIMELIB_LONG_FMT "%" PRId32 # define TIMELIB_ULONG_FMT "%" PRIu32 #endif #if defined(_MSC_VER) typedef uint64_t timelib_ull; typedef int64_t timelib_sll; # define TIMELIB_LL_CONST(n) n ## i64 #else typedef unsigned long long timelib_ull; typedef signed long long timelib_sll; # define TIMELIB_LL_CONST(n) n ## ll #endif typedef struct _ttinfo ttinfo; typedef struct _tlinfo tlinfo; typedef struct _tlocinfo { char country_code[3]; double latitude; double longitude; char *comments; } tlocinfo; typedef struct _timelib_tzinfo { char *name; struct { uint32_t ttisgmtcnt; uint32_t ttisstdcnt; uint32_t leapcnt; uint32_t timecnt; uint32_t typecnt; uint32_t charcnt; } _bit32; struct { uint64_t ttisgmtcnt; uint64_t ttisstdcnt; uint64_t leapcnt; uint64_t timecnt; uint64_t typecnt; uint64_t charcnt; } bit64; int64_t *trans; unsigned char *trans_idx; ttinfo *type; char *timezone_abbr; tlinfo *leap_times; unsigned char bc; tlocinfo location; } timelib_tzinfo; typedef struct _timelib_rel_time { timelib_sll y, m, d; /* Years, Months and Days */ timelib_sll h, i, s; /* Hours, mInutes and Seconds */ timelib_sll us; /* Microseconds */ int weekday; /* Stores the day in 'next monday' */ int weekday_behavior; /* 0: the current day should *not* be counted when advancing forwards; 1: the current day *should* be counted */ int first_last_day_of; int invert; /* Whether the difference should be inverted */ timelib_sll days; /* Contains the number of *days*, instead of Y-M-D differences */ struct { unsigned int type; timelib_sll amount; } special; unsigned int have_weekday_relative, have_special_relative; } timelib_rel_time; typedef struct _timelib_time_offset { int32_t offset; unsigned int leap_secs; unsigned int is_dst; char *abbr; timelib_sll transition_time; } timelib_time_offset; typedef struct _timelib_time { timelib_sll y, m, d; /* Year, Month, Day */ timelib_sll h, i, s; /* Hour, mInute, Second */ timelib_sll us; /* Microseconds */ int z; /* UTC offset in seconds */ char *tz_abbr; /* Timezone abbreviation (display only) */ timelib_tzinfo *tz_info; /* Timezone structure */ signed int dst; /* Flag if we were parsing a DST zone */ timelib_rel_time relative; timelib_sll sse; /* Seconds since epoch */ unsigned int have_time, have_date, have_zone, have_relative, have_weeknr_day; unsigned int sse_uptodate; /* !0 if the sse member is up to date with the date/time members */ unsigned int tim_uptodate; /* !0 if the date/time members are up to date with the sse member */ unsigned int is_localtime; /* 1 if the current struct represents localtime, 0 if it is in GMT */ unsigned int zone_type; /* 1 time offset, * 3 TimeZone identifier, * 2 TimeZone abbreviation */ } timelib_time; typedef struct _timelib_abbr_info { timelib_sll utc_offset; char *abbr; int dst; } timelib_abbr_info; #define TIMELIB_WARN_MASK 0x1ff #define TIMELIB_ERR_MASK 0x2ff #define TIMELIB_WARN_DOUBLE_TZ 0x101 #define TIMELIB_WARN_INVALID_TIME 0x102 #define TIMELIB_WARN_INVALID_DATE 0x103 #define TIMELIB_WARN_TRAILING_DATA 0x11a #define TIMELIB_ERR_DOUBLE_TZ 0x201 #define TIMELIB_ERR_TZID_NOT_FOUND 0x202 #define TIMELIB_ERR_DOUBLE_TIME 0x203 #define TIMELIB_ERR_DOUBLE_DATE 0x204 #define TIMELIB_ERR_UNEXPECTED_CHARACTER 0x205 #define TIMELIB_ERR_EMPTY_STRING 0x206 #define TIMELIB_ERR_UNEXPECTED_DATA 0x207 #define TIMELIB_ERR_NO_TEXTUAL_DAY 0x208 #define TIMELIB_ERR_NO_TWO_DIGIT_DAY 0x209 #define TIMELIB_ERR_NO_THREE_DIGIT_DAY_OF_YEAR 0x20a #define TIMELIB_ERR_NO_TWO_DIGIT_MONTH 0x20b #define TIMELIB_ERR_NO_TEXTUAL_MONTH 0x20c #define TIMELIB_ERR_NO_TWO_DIGIT_YEAR 0x20d #define TIMELIB_ERR_NO_FOUR_DIGIT_YEAR 0x20e #define TIMELIB_ERR_NO_TWO_DIGIT_HOUR 0x20f #define TIMELIB_ERR_HOUR_LARGER_THAN_12 0x210 #define TIMELIB_ERR_MERIDIAN_BEFORE_HOUR 0x211 #define TIMELIB_ERR_NO_MERIDIAN 0x212 #define TIMELIB_ERR_NO_TWO_DIGIT_MINUTE 0x213 #define TIMELIB_ERR_NO_TWO_DIGIT_SECOND 0x214 #define TIMELIB_ERR_NO_SIX_DIGIT_MICROSECOND 0x215 #define TIMELIB_ERR_NO_SEP_SYMBOL 0x216 #define TIMELIB_ERR_EXPECTED_ESCAPE_CHAR 0x217 #define TIMELIB_ERR_NO_ESCAPED_CHAR 0x218 #define TIMELIB_ERR_WRONG_FORMAT_SEP 0x219 #define TIMELIB_ERR_TRAILING_DATA 0x21a #define TIMELIB_ERR_DATA_MISSING 0x21b #define TIMELIB_ERR_NO_THREE_DIGIT_MILLISECOND 0x21c #define TIMELIB_ERR_NO_FOUR_DIGIT_YEAR_ISO 0x21d #define TIMELIB_ERR_NO_TWO_DIGIT_WEEK 0x21e #define TIMELIB_ERR_INVALID_WEEK 0x21f #define TIMELIB_ERR_NO_DAY_OF_WEEK 0x220 #define TIMELIB_ERR_INVALID_DAY_OF_WEEK 0x221 #define TIMELIB_ERR_INVALID_SPECIFIER 0x222 #define TIMELIB_ERR_INVALID_TZ_OFFSET 0x223 #define TIMELIB_ERR_FORMAT_LITERAL_MISMATCH 0x224 #define TIMELIB_ERR_MIX_ISO_WITH_NATURAL 0x225 #define TIMELIB_ZONETYPE_OFFSET 1 #define TIMELIB_ZONETYPE_ABBR 2 #define TIMELIB_ZONETYPE_ID 3 typedef struct _timelib_error_message { int error_code; int position; char character; char *message; } timelib_error_message; typedef struct _timelib_error_container { timelib_error_message *error_messages; timelib_error_message *warning_messages; int error_count; int warning_count; } timelib_error_container; typedef struct _timelib_tz_lookup_table { char *name; int type; float gmtoffset; char *full_tz_name; } timelib_tz_lookup_table; typedef struct _timelib_tzdb_index_entry { char *id; unsigned int pos; } timelib_tzdb_index_entry; typedef struct _timelib_tzdb { char *version; int index_size; const timelib_tzdb_index_entry *index; const unsigned char *data; } timelib_tzdb; #ifndef timelib_malloc # define timelib_malloc malloc # define timelib_realloc realloc # define timelib_calloc calloc # define timelib_strdup strdup # define timelib_free free #endif #define TIMELIB_VERSION 202003 #define TIMELIB_EXTENDED_VERSION 20203001 #define TIMELIB_ASCII_VERSION "2020.03" #define TIMELIB_NONE 0x00 #define TIMELIB_OVERRIDE_TIME 0x01 #define TIMELIB_NO_CLONE 0x02 #define TIMELIB_UNSET -99999 /* An entry for each of these error codes is also in the * timelib_error_messages array in timelib.c */ #define TIMELIB_ERROR_NO_ERROR 0x00 #define TIMELIB_ERROR_CANNOT_ALLOCATE 0x01 #define TIMELIB_ERROR_CORRUPT_TRANSITIONS_DONT_INCREASE 0x02 #define TIMELIB_ERROR_CORRUPT_NO_64BIT_PREAMBLE 0x03 #define TIMELIB_ERROR_CORRUPT_NO_ABBREVIATION 0x04 #define TIMELIB_ERROR_UNSUPPORTED_VERSION 0x05 #define TIMELIB_ERROR_NO_SUCH_TIMEZONE 0x06 #define TIMELIB_ERROR_SLIM_FILE 0x07 #ifdef __cplusplus extern "C" { #endif typedef enum _timelib_format_specifier_code { TIMELIB_FORMAT_ALLOW_EXTRA_CHARACTERS = 0, TIMELIB_FORMAT_ANY_SEPARATOR, TIMELIB_FORMAT_DAY_TWO_DIGIT, TIMELIB_FORMAT_DAY_TWO_DIGIT_PADDED, TIMELIB_FORMAT_DAY_OF_WEEK_ISO, TIMELIB_FORMAT_DAY_OF_WEEK, TIMELIB_FORMAT_DAY_OF_YEAR, TIMELIB_FORMAT_DAY_SUFFIX, TIMELIB_FORMAT_END, TIMELIB_FORMAT_EPOCH_SECONDS, TIMELIB_FORMAT_ESCAPE, TIMELIB_FORMAT_HOUR_TWO_DIGIT_12_MAX, TIMELIB_FORMAT_HOUR_TWO_DIGIT_12_MAX_PADDED, TIMELIB_FORMAT_HOUR_TWO_DIGIT_24_MAX, TIMELIB_FORMAT_HOUR_TWO_DIGIT_24_MAX_PADDED, TIMELIB_FORMAT_LITERAL, TIMELIB_FORMAT_MERIDIAN, TIMELIB_FORMAT_MICROSECOND_SIX_DIGIT, TIMELIB_FORMAT_MILLISECOND_THREE_DIGIT, TIMELIB_FORMAT_MINUTE_TWO_DIGIT, TIMELIB_FORMAT_MONTH_TWO_DIGIT, TIMELIB_FORMAT_MONTH_TWO_DIGIT_PADDED, TIMELIB_FORMAT_RANDOM_CHAR, TIMELIB_FORMAT_RESET_ALL, TIMELIB_FORMAT_RESET_ALL_WHEN_NOT_SET, TIMELIB_FORMAT_SECOND_TWO_DIGIT, TIMELIB_FORMAT_SEPARATOR, TIMELIB_FORMAT_SKIP_TO_SEPARATOR, TIMELIB_FORMAT_TEXTUAL_DAY_3_LETTER, TIMELIB_FORMAT_TEXTUAL_DAY_FULL, TIMELIB_FORMAT_TEXTUAL_MONTH_3_LETTER, TIMELIB_FORMAT_TEXTUAL_MONTH_FULL, TIMELIB_FORMAT_TIMEZONE_OFFSET, TIMELIB_FORMAT_TIMEZONE_OFFSET_MINUTES, TIMELIB_FORMAT_WEEK_OF_YEAR_ISO, TIMELIB_FORMAT_WEEK_OF_YEAR, TIMELIB_FORMAT_WHITESPACE, TIMELIB_FORMAT_YEAR_TWO_DIGIT, TIMELIB_FORMAT_YEAR_FOUR_DIGIT, TIMELIB_FORMAT_YEAR_ISO } timelib_format_specifier_code; typedef struct _timelib_format_specifier { char specifier; timelib_format_specifier_code code; } timelib_format_specifier; typedef struct _timelib_format_config { const timelib_format_specifier *format_map; /* Format speciifiers must be preceded by 'prefix_char' if not '\0'. */ char prefix_char; } timelib_format_config; /* Function pointers */ typedef timelib_tzinfo* (*timelib_tz_get_wrapper)(const char *tzname, const timelib_tzdb *tzdb, int *error_code); /* From dow.c */ /* Calculates the day of the week from y, m, and d. 0=Sunday..6=Saturday */ timelib_sll timelib_day_of_week(timelib_sll y, timelib_sll m, timelib_sll d); /* Calculates the day of the ISO week from y, m, and d. 1=Monday, 7=Sunday */ timelib_sll timelib_iso_day_of_week(timelib_sll y, timelib_sll m, timelib_sll d); /* Calculates the day of the year according to y-m-d. 0=Jan 1st..364/365=Dec * 31st */ timelib_sll timelib_day_of_year(timelib_sll y, timelib_sll m, timelib_sll d); /* Calculates the day of the year according to y-w-dow. 0..364/365 */ timelib_sll timelib_daynr_from_weeknr(timelib_sll iy, timelib_sll iw, timelib_sll id); /* Calculates the number of days in month m for year y. 28..31 */ timelib_sll timelib_days_in_month(timelib_sll y, timelib_sll m); /* Calculates the ISO year and week from y, m, and d, into iw and iy */ void timelib_isoweek_from_date(timelib_sll y, timelib_sll m, timelib_sll d, timelib_sll *iw, timelib_sll *iy); /* Calculates the ISO year, week, and day of week from y, m, and d, into iy, * iw, and id */ void timelib_isodate_from_date(timelib_sll y, timelib_sll m, timelib_sll d, timelib_sll *iy, timelib_sll *iw, timelib_sll *id); /* Calculates the year, month, and day from iy, iw, and iw, into y, m, and d */ void timelib_date_from_isodate(timelib_sll iy, timelib_sll iw, timelib_sll id, timelib_sll *y, timelib_sll *m, timelib_sll *d); /* Returns true if h, i and s fit in the range 00:00:00..23:59:59, false * otherwise */ int timelib_valid_time(timelib_sll h, timelib_sll i, timelib_sll s); /* Returns true if m fits in the range 1..12, and d fits in the range * 1..<days-in-month> for year y */ int timelib_valid_date(timelib_sll y, timelib_sll m, timelib_sll d); /* From parse_date.re */ /* Parses the date/time string in 's' with length 'len' into the constituent * parts of timelib_time*. * * Depending on the contents of the string 's', not all elements might be * filled. You can check whether a specific element has been parsed by * comparing with the TIMELIB_UNSET define. * * If errors occur, this function keeps already parsed elements in the * returned timelib_time* value. * * If the **errors points to a timelib_error_container variable, warnings * and errors will be recorded. You are responsible for freeing the stored * information with timelib_error_container_dtor(). To see whether errors have * occurred, inspect errors->errors_count. To see whether warnings have occurred, * inspect errors->warnings_count. * * The returned timelib_time* value is dynamically allocated and should be * freed with timelib_time_dtor(). */ timelib_time *timelib_strtotime(const char *s, size_t len, timelib_error_container **errors, const timelib_tzdb *tzdb, timelib_tz_get_wrapper tz_get_wrapper); /* Parses the date/time string in 's' with length 'len' into the constituent * parts of timelib_time* according to the format in 'format'. * * Depending on the contents of the string 's', not all elements might be * filled. You can check whether a specific element has been parsed by * comparing with the TIMELIB_UNSET define. * * If errors occur, this function keeps already parsed elements in the * returned timelib_time* value. * * If the **errors points to a timelib_error_container variable, warnings * and errors will be recorded. You are responsible for freeing the stored * information with timelib_error_container_dtor(). To see whether errors have * occurred, inspect errors->errors_count. To see whether warnings have occurred, * inspect errors->warnings_count. * * The returned timelib_time* value is dynamically allocated and should be * freed with timelib_time_dtor(). */ timelib_time *timelib_parse_from_format(const char *format, const char *s, size_t len, timelib_error_container **errors, const timelib_tzdb *tzdb, timelib_tz_get_wrapper tz_get_wrapper); /* Parses the date/time string in 's' with length 'len' into the constituent * parts of timelib_time* according to the format in 'format' with format * specifier configuration 'format_config'. * * 'format_map' is an array of pairs, with the first element being the format * specifier as a character and the second element corresponds to the * representation of the specifier from the enum list * 'timelib_format_specifier_code'. * * Note: 'format_map' must be terminated with specifier '\0' to indicate to the * parser that there are no more format specifiers in the list. */ timelib_time *timelib_parse_from_format_with_map(const char *format, const char *s, size_t len, timelib_error_container **errors, const timelib_tzdb *tzdb, timelib_tz_get_wrapper tz_get_wrapper, const timelib_format_config* format_config); /* Fills the gaps in the parsed timelib_time with information from the reference date/time in 'now' * * If any of the 'parsed' y, m, d, h, i or s parameters is unset (TIMELIB_UNSET): * - if microtime (us) is unset, then the us of the parsed time is set to 0. * - else if microtime (us) is unset and 'now'->'us' is set, use it, otherwise use 0. * * For either of the 'parsed' y, m, d, h, i, s, z (utc offset in seconds) or * dst is unset, set it to the corresponding value in 'now' if set, otherwise * set it to 0. * * It duplicates tz_abbr if unset in 'parsed' but set in 'now'. * * It duplicates tz_info if unset in 'parsed', but set in 'now' unless * TIMELIB_NO_CLONE is passed, in which case only the pointer in 'parsed' is * set to 'now'. * * If the option TIMELIB_OVERRIDE_TIME is passed and the parsed date/time has * no time portion, the function will ignore the time aspect in 'now' and * instead fill it with zeros. */ void timelib_fill_holes(timelib_time *parsed, timelib_time *now, int options); /* Tries to convert a time zone abbreviation, gmtoffset and/or isdst flag * combination to a time zone identifier. * * If 'abbr' is either 'utc' or 'gmt' (case insensitve) then "UTC" is * returned. * * It first uses the data in the timezonemap.h file to find a matching * abbreviation/GMT offset combination. If not found, it uses the data in * fallbackmap.h to match only the GMT offset/isdst flag to try to find a * match. If nothing is found, NULL is returned. * * The returned char* is not duplicated, and should not be freed. */ char *timelib_timezone_id_from_abbr(const char *abbr, timelib_long gmtoffset, int isdst); /* Returns an array of known time zone abbreviations * * This file is generated from the time zone database through the * gettzmapping.php scripts, which requires that an up-to-date time zone * database is used with the PHP binary that runs the script. * * Each item in the returned list contains the abbreviation, a flag whether * it's an abbreviation used with DST, the UTC offset in seconds, and the name * of the time zone identifier that this abbreviation belongs to. * * The order for each specific abbreviation is controlled through the * preference list in the gettzmapping.php script. Time zones that match the * pattern ±\d{2,4} are excluded */ const timelib_tz_lookup_table *timelib_timezone_abbreviations_list(void); /** * DEPRECATED, but still used by PHP. */ timelib_long timelib_parse_zone(const char **ptr, int *dst, timelib_time *t, int *tz_not_found, const timelib_tzdb *tzdb, timelib_tz_get_wrapper tz_wrapper); /* From parse_iso_intervals.re */ /** * Parses a subset of an ISO 8601 intervals specification string into its * constituent parts. * * If the **errors points to a timelib_error_container variable, warnings * and errors will be recorded. You are responsible for freeing the stored * information with timelib_error_container_dtor(). To see whether errors have * occurred, inspect errors->errors_count. To see whether warnings have occurred, * inspect errors->warnings_count. */ void timelib_strtointerval(const char *s, size_t len, timelib_time **begin, timelib_time **end, timelib_rel_time **period, int *recurrences, timelib_error_container **errors); /* From tm2unixtime.c */ /** * Uses the y/m/d/h/i/s fields to calculate and store the equivalent timestamp * in the sse field. * * It uses the time zone information associated with 'time' to account for the * right UTC offset and/or DST rules. You can associate time zone information * with the timelib_set_timezone_* functions (see below). * * If the type is 'TIMELIB_ZONETYPE_ID' and there is no associated tzinfo, it * will use the second argument 'tzi' to provide the rules necessary to * calculate the right timestamp. */ void timelib_update_ts(timelib_time* time, timelib_tzinfo* tzi); /** * Takes the information from the y/m/d/h/i/s fields and makes sure their * values are in the right range. * * If a value under- or overflows it will adjust the larger measure up (or * down). It also takes into account leap days. */ void timelib_do_normalize(timelib_time *base); /** * Takes the information from the y/m/d/h/i/s fields of 'rt' and makes sure * their values are in the right range. * * If a value under- or overflows it will adjust the larger measure up (or * down). As this function operates on a *relative date/time*, it also takes * into account leap days and correctly accounts for the difference depending * on the base date/time in 'base'. */ void timelib_do_rel_normalize(timelib_time *base, timelib_rel_time *rt); /* From unixtime2tm.c */ /** * Takes the unix timestamp in seconds from 'ts' and populates the y/m/d/h/i/s * fields of 'tm' without taking time zones into account */ void timelib_unixtime2gmt(timelib_time* tm, timelib_sll ts); /** * Takes the Unix timestamp from 'ts', and calculates the y/m/d/h/i/s fields * according to the time zone information attached to 'tm'. */ void timelib_unixtime2local(timelib_time *tm, timelib_sll ts); /** * Takes the Unix timestamp stored in 'tm', and calculates the y/m/d/h/i/s * fields according to the time zone information attached to 'tm'. */ void timelib_update_from_sse(timelib_time *tm); /** * Attaches the UTC offset as time zone information to 't'. * * 'utc_offset' is in seconds East of UTC. */ void timelib_set_timezone_from_offset(timelib_time *t, timelib_sll utc_offset); /** * Attaches the information from 'abbr_info' as time zone information to 't'. * * The timelib_abbr_info struct contains an abbreviation ('abbr') which string * value is duplicated, as well as a 'utc_offset' and 'dst' flag. It only * supports a 'dst' change over of 1 hour. */ void timelib_set_timezone_from_abbr(timelib_time *t, timelib_abbr_info abbr_info); /** * Attaches the time zone information in 'tz' to to 't'. * * It fetches the right UTC offset that is currently stored in the time * stamp field in 't' ('sse'), and assigns that to the 'z' field and 'dst' * field (whether DST is in effect at the time). It also sets the current * abbreviation to the 'tz_addr' field, making sure that if a value was already * set it was freed. * * The time zone information in 'tz' is *not* duplicated into the 't' field so * it should not be freed until all timelib_time* variables have been freed as * well. */ void timelib_set_timezone(timelib_time *t, timelib_tzinfo *tz); /* From parse_tz.c */ /** * Returns whether the time zone ID 'timezone' is available in the time zone * database as pointed to be 'tzdb'. */ int timelib_timezone_id_is_valid(const char *timezone, const timelib_tzdb *tzdb); /** * Converts the binary stored time zone information from 'tzdb' for the time * zone 'timezone' into a structure the library can use for calculations. * * The function can be used on both timelib_builtin_db as well as a time zone * db as opened by timelib_zoneinfo. * * 'error_code' must not be a null pointer, and will always be written to. If * the value is TIMELIB_ERROR_NO_ERROR then the file was parsed without * problems. * * The function will return null upon failure, and also set an error code * through 'error_code'. * * The error code is one of the TIMELIB_ERROR_* constants as listed above. * These error constants can be converted into a string by * timelib_get_error_message. * * If the function returns not-null, the 'error_code' might have a non-null * value that can be used to detect incompatibilities. The only one that is * currently detected is whether the file is a 'slim' file, in which case * 'error_code' will be set to TIMELIB_ERROR_SLIM_FILE. * * This function allocates memory for the new time zone structure, which must * be freed after use. Although it is recommended that a cache of each used * time zone is kept. */ timelib_tzinfo *timelib_parse_tzfile(const char *timezone, const timelib_tzdb *tzdb, int *error_code); /** * Frees up the resources allocated by 'timelib_parse_tzfile'. */ void timelib_tzinfo_dtor(timelib_tzinfo *tz); /** * Deep-clones a timelib_tzinfo structure. * * This allocates resources that need to be freed with 'timelib_tzinfo_dtor' */ timelib_tzinfo* timelib_tzinfo_clone(timelib_tzinfo *tz); /** * Returns whether DST is active with time zone 'tz' for the time stamp 'ts'. * * Returns 0 if DST is not active, 1 if DST is active, or -1 if no transitions * were available through 'tz'. */ int timelib_timestamp_is_in_dst(timelib_sll ts, timelib_tzinfo *tz); /** * Returns offset information with time zone 'tz' for the time stamp 'ts'. * * The returned information contains: the offset in seconds East of UTC (in * 'offset'), whether DST is active ('is_dst'), what the current time zone * abbreviation is ('abbr') and the transition time that got to this state (in * 'transition_time'); */ timelib_time_offset *timelib_get_time_zone_info(timelib_sll ts, timelib_tzinfo *tz); /** * Returns the UTC offset currently applicable for the information stored in 't'. * * The value returned is the UTC offset in seconds East. */ timelib_sll timelib_get_current_offset(timelib_time *t); /** * Displays debugging information about the time zone information in 'tz'. */ void timelib_dump_tzinfo(timelib_tzinfo *tz); /** * Returns a pointer to the built-in time zone database. * * You must *not* free the returned pointer as it is part of the text segment. */ const timelib_tzdb *timelib_builtin_db(void); /** * Returns a pointer to the start of an array containing a list of timezone identifiers. * * The amount of entries in the array is returned through the 'count' OUT parameter. * * Each entry contains the time zone ID ('id' field), and the position within the time zone * information ('pos' field). The pos field should not be used. */ const timelib_tzdb_index_entry *timelib_timezone_identifiers_list(const timelib_tzdb *tzdb, int *count); /* From parse_zoneinfo.c */ /** * Scans the directory and subdirectories of 'directory' for valid time zone files and builds * a time zone database out of these files. * * Typically, the directory should point to '/usr/share/zoneinfo'. * * Unlike 'timelib_builtin_db', the return value of this function must be freed * with the 'timelib_zoneinfo_dtor' function. */ timelib_tzdb *timelib_zoneinfo(const char *directory); /** * Frees up the resources as created through 'timelib_zoneinfo'. * * This function must be used to free up all the resources that have been * allocated while calling 'timelib_zoneinfo'. */ void timelib_zoneinfo_dtor(timelib_tzdb *tzdb); /* From timelib.c */ /** * Returns a static string containing an error message belonging to a specific * error code. */ const char *timelib_get_error_message(int error_code); /** * Allocates resources for the relative time structure. * * Must be freed with 'timelib_rel_time_dtor'. */ timelib_rel_time* timelib_rel_time_ctor(void); /** * Frees up the resources as allocated through 'timelib_rel_time_ctor'. */ void timelib_rel_time_dtor(timelib_rel_time* t); /** * Creates a new timelib_rel_time resource and copies over the information * from 'tz'. * * Must be freed with 'timelib_rel_time_dtor'. */ timelib_rel_time* timelib_rel_time_clone(timelib_rel_time *tz); /** * Allocates resources for the time structure. * * Must be freed with 'timelib_time_dtor'. */ timelib_time* timelib_time_ctor(void); /** * Frees up the resources as allocated through 'timelib_time_ctor'. */ void timelib_time_dtor(timelib_time* t); /** * Creates a new timelib_time resource and copies over the information * from 'orig'. * * Must be freed with 'timelib_time_dtor'. */ timelib_time* timelib_time_clone(timelib_time* orig); /** * Compares two timelib_time structures and returns which one is earlier in * time. * * To decide which comes earlier it uses the 'sse' (Seconds Since Epoch) and * 'us' (microseconds) fields. * * Returns -1 if t1 < t2, 0 if t1 == t2, and -1 if t1 > t2. */ int timelib_time_compare(timelib_time *t1, timelib_time *t2); /** * Allocates resources for the time offset structure. * * Must be freed with 'timelib_time_offset_dtor'. */ timelib_time_offset* timelib_time_offset_ctor(void); /** * Frees up the resources as allocated through 'timelib_time_offset_ctor'. */ void timelib_time_offset_dtor(timelib_time_offset* t); /** * Frees up the resources allocated while converting strings to timelib_time * structures with the timelib_strtotime and timelib_strtointerval functions. */ void timelib_error_container_dtor(timelib_error_container *errors); /** * Converts the 'sse' value of 'd' to a timelib_long type. * * If the value fits in the TIMELIB_LONG_MIN and TIMELIB_LONG_MAX range, the * value is cast to (timelib_long) and returned. If *error is not a NULL * pointer, it will be set to 0. * * If the value does *not* fit in the range, the function returns 0 and if * *error is not a NULL pointer, it will be set to 1. * * timelib_long is a 32 bit signed long integer on 32 bit platforms, and a 64 * bit signed long long integer on 64 bit platforms. In other words, it makes * sure that the value in 'sse' (which is always a signed long long 64 bit * integer) can be used safely outside of the library. */ timelib_long timelib_date_to_int(timelib_time *d, int *error); /** * Displays debugging information about the date/time information stored in 'd'. * * 'options' is a bit field, where: * - 1 controls whether the relative time portion is shown. * - 2 controls whether the zone type is shown. */ void timelib_dump_date(timelib_time *d, int options); /** * Displays debugging information about the relative time information stored * in 'd'. */ void timelib_dump_rel_time(timelib_rel_time *d); /** * Converts a decimal hour into hour/min/sec components */ void timelib_decimal_hour_to_hms(double h, int *hour, int *min, int *sec); /** * Converts hour/min/sec values into a decimal hour */ void timelib_hms_to_decimal_hour(int hour, int min, int sec, double *h); /* from astro.c */ /** * Converts the Unix Epoch time stamp 'ts' to a Julian Day * * The value returned is the number of whole days since -4714-11-24T12:00:00 UTC * (in the proleptic Gregorian calendar): * https://en.wikipedia.org/wiki/Julian_day */ double timelib_ts_to_julianday(timelib_sll ts); /** * Converts the Unix Epoch time stamp 'ts' to the J2000 epoch * * The value returned is the number of whole days since 2000-01-01T12:00:00 * UTC: https://en.wikipedia.org/wiki/Epoch_(astronomy)#Julian_years_and_J2000 */ double timelib_ts_to_j2000(timelib_sll ts); /** * Calculates when the Sun is above a certain latitude. * * Parameters: * - time: A timelib_time time describing that needs to specific midnight for a * specific day. * - lon: The longitude of the observer (East positive, West negative). * - lat: The latitude of the observer (North positive, South negative). * - altit: The altitude. Set to -35/60 for rise/set, -6 for civil twilight, * -12 for nautical, and -18 for astronomical twilight. * - upper_limb: set to non-zero for rise/set calculations, and 0 for twilight * calculations. * * Out Parameters: * - h_rise: The decimal hour when the Sun rises * - h_set: The decimal hour when the Sun sets * - ts_rise: The Unix timestamp of the Sun rising * - ts_set: The Unix timestamp of the Sun setting * - ts_transit: The Unix timestmap of the Sun transitting through South * * Return Values: * - 0: The Sun rises and sets. * - +1: The Sun is always above the horizon. (ts_rise is set to ts_transit - * (12 * 3600); ts_set is set to ts_transit + (12 * 3600). * - -1: The Sun is awlays below the horizon. (ts_rise and ts_set are set * to ts_transit) */ int timelib_astro_rise_set_altitude(timelib_time *time, double lon, double lat, double altit, int upper_limb, double *h_rise, double *h_set, timelib_sll *ts_rise, timelib_sll *ts_set, timelib_sll *ts_transit); /* from interval.c */ /** * Calculates the difference between two times * * The result is a timelib_rel_time structure that describes how you can * convert from 'one' to 'two' with 'timelib_add'. This does *not* necessarily * mean that you can go from 'two' to 'one' by using 'timelib_sub' due to the * way months and days are calculated. */ timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two); /** * Adds the relative time information 'interval' to the base time 't'. * * This can be a relative time as created by 'timelib_diff', but also by more * complex statements such as "next workday". */ timelib_time *timelib_add(timelib_time *t, timelib_rel_time *interval); /** * Subtracts the relative time information 'interval' to the base time 't'. * * This can be a relative time as created by 'timelib_diff'. Unlike with * 'timelib_add', this does not support more complex statements such as "next * workday". */ timelib_time *timelib_sub(timelib_time *t, timelib_rel_time *interval); #ifdef __cplusplus } /* extern "C" */ #endif #endif