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| timelib.h | |||||
| timelib_config.h |
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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 201804
#define TIMELIB_EXTENDED_VERSION 20180401
#define TIMELIB_ASCII_VERSION "2018.04"
#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
#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)(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(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(char *format, 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(char *format, 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(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(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(char *timezone, const timelib_tzdb *tzdb);
/**
* Converts the binary stored time zone information from 'tzdb' for the time
* zone 'timeozne' 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.
* The function will return null upon failure, and also set an error code
* through 'error_code'. 'error_code' must not be a null pointer. 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.
*
* 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(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(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
| .. | |||||
| timelib.h | |||||
| timelib_config.h |