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netsurf/utils/time.c

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/*
* Copyright 2007 Rob Kendrick <rjek@netsurf-browser.org>
* Copyright 2004-2007 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
* Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2004 John Tytgat <joty@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file utils/time.c
* \brief Implementation of time operations.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#ifdef WITH_CURL
#include <curl/curl.h>
#endif
#include "utils/ascii.h"
#include "utils/errors.h"
#include "utils/time.h"
/**
* Weekdays
*
* Must be calender order.
*/
enum nsc_time_weekdays {
NSC_TIME_WEEKDAY_SUN,
NSC_TIME_WEEKDAY_MON,
NSC_TIME_WEEKDAY_TUE,
NSC_TIME_WEEKDAY_WED,
NSC_TIME_WEEKDAY_THU,
NSC_TIME_WEEKDAY_FRI,
NSC_TIME_WEEKDAY_SAT,
NSC_TIME_WEEKDAY__COUNT
};
/**
* Months
*
* Must be calender order.
*/
enum nsc_time_months {
NSC_TIME_MONTH_JAN,
NSC_TIME_MONTH_FEB,
NSC_TIME_MONTH_MAR,
NSC_TIME_MONTH_APR,
NSC_TIME_MONTH_MAY,
NSC_TIME_MONTH_JUN,
NSC_TIME_MONTH_JUL,
NSC_TIME_MONTH_AUG,
NSC_TIME_MONTH_SEP,
NSC_TIME_MONTH_OCT,
NSC_TIME_MONTH_NOV,
NSC_TIME_MONTH_DEC,
NSC_TIME_MONTH__COUNT,
};
/**
* Array of short weekday names.
*/
static const char * const weekdays_short[NSC_TIME_WEEKDAY__COUNT] = {
[NSC_TIME_WEEKDAY_SUN] = "Sun",
[NSC_TIME_WEEKDAY_MON] = "Mon",
[NSC_TIME_WEEKDAY_TUE] = "Tue",
[NSC_TIME_WEEKDAY_WED] = "Wed",
[NSC_TIME_WEEKDAY_THU] = "Thu",
[NSC_TIME_WEEKDAY_FRI] = "Fri",
[NSC_TIME_WEEKDAY_SAT] = "Sat"
};
/**
* Array of month names.
*/
static const char * const months[NSC_TIME_MONTH__COUNT] = {
[NSC_TIME_MONTH_JAN] = "Jan",
[NSC_TIME_MONTH_FEB] = "Feb",
[NSC_TIME_MONTH_MAR] = "Mar",
[NSC_TIME_MONTH_APR] = "Apr",
[NSC_TIME_MONTH_MAY] = "May",
[NSC_TIME_MONTH_JUN] = "Jun",
[NSC_TIME_MONTH_JUL] = "Jul",
[NSC_TIME_MONTH_AUG] = "Aug",
[NSC_TIME_MONTH_SEP] = "Sep",
[NSC_TIME_MONTH_OCT] = "Oct",
[NSC_TIME_MONTH_NOV] = "Nov",
[NSC_TIME_MONTH_DEC] = "Dec"
};
/* exported interface documented in utils/time.h */
const char *rfc1123_date(time_t t)
{
static char ret[30];
struct tm *tm = gmtime(&t);
snprintf(ret, sizeof ret, "%s, %02d %s %d %02d:%02d:%02d GMT",
weekdays_short[tm->tm_wday], tm->tm_mday,
months[tm->tm_mon], tm->tm_year + 1900,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return ret;
}
/* exported function documented in utils/time.h */
int nsc_sntimet(char *str, size_t size, time_t *timep)
{
#ifndef HAVE_STRFTIME
long long val;
val = (long long)*timep;
return snprintf(str, size, "%lld", val);
#else
struct tm *ltm;
ltm = localtime(timep);
if (ltm == NULL) {
return -1;
}
return strftime(str, size, "%s", ltm);
#endif
}
/* exported function documented in utils/time.h */
nserror nsc_snptimet(const char *str, size_t size, time_t *timep)
{
time_t time_out;
#ifndef HAVE_STRPTIME
char *rstr;
if (size < 1) {
return NSERROR_BAD_PARAMETER;
}
errno = 0;
time_out = (time_t)strtoll(str, &rstr, 10);
/* The conversion may have a range faliure or no digits were found */
if ((errno != 0) || (rstr == str)) {
return NSERROR_BAD_PARAMETER;
}
#else
struct tm ltm;
if (size < 1) {
return NSERROR_BAD_PARAMETER;
}
if (strptime(str, "%s", &ltm) == NULL) {
return NSERROR_BAD_PARAMETER;
}
time_out = mktime(&ltm);
#endif
*timep = time_out;
return NSERROR_OK;
}
#ifndef WITH_CURL
/**
* Array of long weekday names.
*/
static const char * const weekdays_long[NSC_TIME_WEEKDAY__COUNT] = {
[NSC_TIME_WEEKDAY_SUN] = "Sunday",
[NSC_TIME_WEEKDAY_MON] = "Monday",
[NSC_TIME_WEEKDAY_TUE] = "Tuesday",
[NSC_TIME_WEEKDAY_WED] = "Wednesday",
[NSC_TIME_WEEKDAY_THU] = "Thursday",
[NSC_TIME_WEEKDAY_FRI] = "Friday",
[NSC_TIME_WEEKDAY_SAT] = "Saturday"
};
/**
* Timezone offsets in mins
*
* Order doesn't matter.
*/
enum nsc_time_zone_offsets {
/* Timezones */
NSC_TIME_ZONE_OFFSET_IDLE = -12 * 60,
NSC_TIME_ZONE_OFFSET_NZST = -12 * 60,
NSC_TIME_ZONE_OFFSET_NZT = -12 * 60,
NSC_TIME_ZONE_OFFSET_EAST = -10 * 60,
NSC_TIME_ZONE_OFFSET_GST = -10 * 60,
NSC_TIME_ZONE_OFFSET_JST = - 9 * 60,
NSC_TIME_ZONE_OFFSET_CCT = - 8 * 60,
NSC_TIME_ZONE_OFFSET_WAST = - 7 * 60,
NSC_TIME_ZONE_OFFSET_EET = - 2 * 60,
NSC_TIME_ZONE_OFFSET_CET = - 1 * 60,
NSC_TIME_ZONE_OFFSET_FWT = - 1 * 60,
NSC_TIME_ZONE_OFFSET_MET = - 1 * 60,
NSC_TIME_ZONE_OFFSET_MEWT = - 1 * 60,
NSC_TIME_ZONE_OFFSET_GMT = 0,
NSC_TIME_ZONE_OFFSET_UTC = 0,
NSC_TIME_ZONE_OFFSET_WET = 0,
NSC_TIME_ZONE_OFFSET_WAT = 1 * 60,
NSC_TIME_ZONE_OFFSET_AST = 4 * 60,
NSC_TIME_ZONE_OFFSET_EST = 5 * 60,
NSC_TIME_ZONE_OFFSET_CST = 6 * 60,
NSC_TIME_ZONE_OFFSET_MST = 7 * 60,
NSC_TIME_ZONE_OFFSET_PST = 8 * 60,
NSC_TIME_ZONE_OFFSET_YST = 9 * 60,
NSC_TIME_ZONE_OFFSET_AHST = 10 * 60,
NSC_TIME_ZONE_OFFSET_CAT = 10 * 60,
NSC_TIME_ZONE_OFFSET_HST = 10 * 60,
NSC_TIME_ZONE_OFFSET_IDLW = 12 * 60,
/* Daylight saving modified timezones */
NSC_TIME_ZONE_OFFSET_NZDT = NSC_TIME_ZONE_OFFSET_NZT - 60,
NSC_TIME_ZONE_OFFSET_EADT = NSC_TIME_ZONE_OFFSET_EAST - 60,
NSC_TIME_ZONE_OFFSET_WADT = NSC_TIME_ZONE_OFFSET_WAST - 60,
NSC_TIME_ZONE_OFFSET_CEST = NSC_TIME_ZONE_OFFSET_CET - 60,
NSC_TIME_ZONE_OFFSET_FST = NSC_TIME_ZONE_OFFSET_FWT - 60,
NSC_TIME_ZONE_OFFSET_MEST = NSC_TIME_ZONE_OFFSET_MET - 60,
NSC_TIME_ZONE_OFFSET_MESZ = NSC_TIME_ZONE_OFFSET_MET - 60,
NSC_TIME_ZONE_OFFSET_BST = NSC_TIME_ZONE_OFFSET_GMT - 60,
NSC_TIME_ZONE_OFFSET_ADT = NSC_TIME_ZONE_OFFSET_AST - 60,
NSC_TIME_ZONE_OFFSET_EDT = NSC_TIME_ZONE_OFFSET_EST - 60,
NSC_TIME_ZONE_OFFSET_CDT = NSC_TIME_ZONE_OFFSET_CST - 60,
NSC_TIME_ZONE_OFFSET_MDT = NSC_TIME_ZONE_OFFSET_MST - 60,
NSC_TIME_ZONE_OFFSET_PDT = NSC_TIME_ZONE_OFFSET_PST - 60,
NSC_TIME_ZONE_OFFSET_YDT = NSC_TIME_ZONE_OFFSET_YST - 60,
NSC_TIME_ZONE_OFFSET_HDT = NSC_TIME_ZONE_OFFSET_HST - 60,
/* Military timezones */
NSC_TIME_ZONE_OFFSET_Y = -12 * 60,
NSC_TIME_ZONE_OFFSET_X = -11 * 60,
NSC_TIME_ZONE_OFFSET_W = -10 * 60,
NSC_TIME_ZONE_OFFSET_V = - 9 * 60,
NSC_TIME_ZONE_OFFSET_U = - 8 * 60,
NSC_TIME_ZONE_OFFSET_T = - 7 * 60,
NSC_TIME_ZONE_OFFSET_S = - 6 * 60,
NSC_TIME_ZONE_OFFSET_R = - 5 * 60,
NSC_TIME_ZONE_OFFSET_Q = - 4 * 60,
NSC_TIME_ZONE_OFFSET_P = - 3 * 60,
NSC_TIME_ZONE_OFFSET_O = - 2 * 60,
NSC_TIME_ZONE_OFFSET_N = - 1 * 60,
NSC_TIME_ZONE_OFFSET_Z = 0 * 60,
NSC_TIME_ZONE_OFFSET_A = 1 * 60,
NSC_TIME_ZONE_OFFSET_B = 2 * 60,
NSC_TIME_ZONE_OFFSET_C = 3 * 60,
NSC_TIME_ZONE_OFFSET_D = 4 * 60,
NSC_TIME_ZONE_OFFSET_E = 5 * 60,
NSC_TIME_ZONE_OFFSET_F = 6 * 60,
NSC_TIME_ZONE_OFFSET_G = 7 * 60,
NSC_TIME_ZONE_OFFSET_H = 8 * 60,
NSC_TIME_ZONE_OFFSET_I = 9 * 60,
NSC_TIME_ZONE_OFFSET_K = 10 * 60,
NSC_TIME_ZONE_OFFSET_L = 11 * 60,
NSC_TIME_ZONE_OFFSET_M = 12 * 60,
};
/**
* List of timezones.
*
* The order here is the order they appear in the `timezone_mins` and
* `timezones` arrays. So there is value in putting the most common
* timezones first.
*/
enum nsc_time_zones {
/** "GMT" first since its the only one I've seen in the wild. -- tlsa */
NSC_TIME_ZONE_GMT,
NSC_TIME_ZONE_IDLE,
NSC_TIME_ZONE_NZST,
NSC_TIME_ZONE_NZT,
NSC_TIME_ZONE_EAST,
NSC_TIME_ZONE_GST,
NSC_TIME_ZONE_JST,
NSC_TIME_ZONE_CCT,
NSC_TIME_ZONE_WAST,
NSC_TIME_ZONE_EET,
NSC_TIME_ZONE_CET,
NSC_TIME_ZONE_FWT,
NSC_TIME_ZONE_MET,
NSC_TIME_ZONE_MEWT,
NSC_TIME_ZONE_UTC,
NSC_TIME_ZONE_WET,
NSC_TIME_ZONE_WAT,
NSC_TIME_ZONE_AST,
NSC_TIME_ZONE_EST,
NSC_TIME_ZONE_CST,
NSC_TIME_ZONE_MST,
NSC_TIME_ZONE_PST,
NSC_TIME_ZONE_YST,
NSC_TIME_ZONE_AHST,
NSC_TIME_ZONE_CAT,
NSC_TIME_ZONE_HST,
NSC_TIME_ZONE_IDLW,
NSC_TIME_ZONE_NZDT,
NSC_TIME_ZONE_EADT,
NSC_TIME_ZONE_WADT,
NSC_TIME_ZONE_CEST,
NSC_TIME_ZONE_FST,
NSC_TIME_ZONE_MEST,
NSC_TIME_ZONE_MESZ,
NSC_TIME_ZONE_BST,
NSC_TIME_ZONE_ADT,
NSC_TIME_ZONE_EDT,
NSC_TIME_ZONE_CDT,
NSC_TIME_ZONE_MDT,
NSC_TIME_ZONE_PDT,
NSC_TIME_ZONE_YDT,
NSC_TIME_ZONE_HDT,
NSC_TIME_ZONE_Y,
NSC_TIME_ZONE_X,
NSC_TIME_ZONE_W,
NSC_TIME_ZONE_V,
NSC_TIME_ZONE_U,
NSC_TIME_ZONE_T,
NSC_TIME_ZONE_S,
NSC_TIME_ZONE_R,
NSC_TIME_ZONE_Q,
NSC_TIME_ZONE_P,
NSC_TIME_ZONE_O,
NSC_TIME_ZONE_N,
NSC_TIME_ZONE_Z,
NSC_TIME_ZONE_A,
NSC_TIME_ZONE_B,
NSC_TIME_ZONE_C,
NSC_TIME_ZONE_D,
NSC_TIME_ZONE_E,
NSC_TIME_ZONE_F,
NSC_TIME_ZONE_G,
NSC_TIME_ZONE_H,
NSC_TIME_ZONE_I,
NSC_TIME_ZONE_K,
NSC_TIME_ZONE_L,
NSC_TIME_ZONE_M,
NSC_TIME_ZONE__COUNT
};
/**
* Array of minute offsets for timezones.
*/
static const int16_t timezone_mins[NSC_TIME_ZONE__COUNT] = {
[NSC_TIME_ZONE_IDLE] = NSC_TIME_ZONE_OFFSET_IDLE,
[NSC_TIME_ZONE_NZST] = NSC_TIME_ZONE_OFFSET_NZST,
[NSC_TIME_ZONE_NZT] = NSC_TIME_ZONE_OFFSET_NZT,
[NSC_TIME_ZONE_EAST] = NSC_TIME_ZONE_OFFSET_EAST,
[NSC_TIME_ZONE_GST] = NSC_TIME_ZONE_OFFSET_GST,
[NSC_TIME_ZONE_JST] = NSC_TIME_ZONE_OFFSET_JST,
[NSC_TIME_ZONE_CCT] = NSC_TIME_ZONE_OFFSET_CCT,
[NSC_TIME_ZONE_WAST] = NSC_TIME_ZONE_OFFSET_WAST,
[NSC_TIME_ZONE_EET] = NSC_TIME_ZONE_OFFSET_EET,
[NSC_TIME_ZONE_CET] = NSC_TIME_ZONE_OFFSET_CET,
[NSC_TIME_ZONE_FWT] = NSC_TIME_ZONE_OFFSET_FWT,
[NSC_TIME_ZONE_MET] = NSC_TIME_ZONE_OFFSET_MET,
[NSC_TIME_ZONE_MEWT] = NSC_TIME_ZONE_OFFSET_MEWT,
[NSC_TIME_ZONE_GMT] = NSC_TIME_ZONE_OFFSET_GMT,
[NSC_TIME_ZONE_UTC] = NSC_TIME_ZONE_OFFSET_UTC,
[NSC_TIME_ZONE_WET] = NSC_TIME_ZONE_OFFSET_WET,
[NSC_TIME_ZONE_WAT] = NSC_TIME_ZONE_OFFSET_WAT,
[NSC_TIME_ZONE_AST] = NSC_TIME_ZONE_OFFSET_AST,
[NSC_TIME_ZONE_EST] = NSC_TIME_ZONE_OFFSET_EST,
[NSC_TIME_ZONE_CST] = NSC_TIME_ZONE_OFFSET_CST,
[NSC_TIME_ZONE_MST] = NSC_TIME_ZONE_OFFSET_MST,
[NSC_TIME_ZONE_PST] = NSC_TIME_ZONE_OFFSET_PST,
[NSC_TIME_ZONE_YST] = NSC_TIME_ZONE_OFFSET_YST,
[NSC_TIME_ZONE_AHST] = NSC_TIME_ZONE_OFFSET_AHST,
[NSC_TIME_ZONE_CAT] = NSC_TIME_ZONE_OFFSET_CAT,
[NSC_TIME_ZONE_HST] = NSC_TIME_ZONE_OFFSET_HST,
[NSC_TIME_ZONE_IDLW] = NSC_TIME_ZONE_OFFSET_IDLW,
[NSC_TIME_ZONE_NZDT] = NSC_TIME_ZONE_OFFSET_NZDT,
[NSC_TIME_ZONE_EADT] = NSC_TIME_ZONE_OFFSET_EADT,
[NSC_TIME_ZONE_WADT] = NSC_TIME_ZONE_OFFSET_WADT,
[NSC_TIME_ZONE_CEST] = NSC_TIME_ZONE_OFFSET_CEST,
[NSC_TIME_ZONE_FST] = NSC_TIME_ZONE_OFFSET_FST,
[NSC_TIME_ZONE_MEST] = NSC_TIME_ZONE_OFFSET_MEST,
[NSC_TIME_ZONE_MESZ] = NSC_TIME_ZONE_OFFSET_MESZ,
[NSC_TIME_ZONE_BST] = NSC_TIME_ZONE_OFFSET_BST,
[NSC_TIME_ZONE_ADT] = NSC_TIME_ZONE_OFFSET_ADT,
[NSC_TIME_ZONE_EDT] = NSC_TIME_ZONE_OFFSET_EDT,
[NSC_TIME_ZONE_CDT] = NSC_TIME_ZONE_OFFSET_CDT,
[NSC_TIME_ZONE_MDT] = NSC_TIME_ZONE_OFFSET_MDT,
[NSC_TIME_ZONE_PDT] = NSC_TIME_ZONE_OFFSET_PDT,
[NSC_TIME_ZONE_YDT] = NSC_TIME_ZONE_OFFSET_YDT,
[NSC_TIME_ZONE_HDT] = NSC_TIME_ZONE_OFFSET_HDT,
[NSC_TIME_ZONE_Y] = NSC_TIME_ZONE_OFFSET_Y,
[NSC_TIME_ZONE_X] = NSC_TIME_ZONE_OFFSET_X,
[NSC_TIME_ZONE_W] = NSC_TIME_ZONE_OFFSET_W,
[NSC_TIME_ZONE_V] = NSC_TIME_ZONE_OFFSET_V,
[NSC_TIME_ZONE_U] = NSC_TIME_ZONE_OFFSET_U,
[NSC_TIME_ZONE_T] = NSC_TIME_ZONE_OFFSET_T,
[NSC_TIME_ZONE_S] = NSC_TIME_ZONE_OFFSET_S,
[NSC_TIME_ZONE_R] = NSC_TIME_ZONE_OFFSET_R,
[NSC_TIME_ZONE_Q] = NSC_TIME_ZONE_OFFSET_Q,
[NSC_TIME_ZONE_P] = NSC_TIME_ZONE_OFFSET_P,
[NSC_TIME_ZONE_O] = NSC_TIME_ZONE_OFFSET_O,
[NSC_TIME_ZONE_N] = NSC_TIME_ZONE_OFFSET_N,
[NSC_TIME_ZONE_Z] = NSC_TIME_ZONE_OFFSET_Z,
[NSC_TIME_ZONE_A] = NSC_TIME_ZONE_OFFSET_A,
[NSC_TIME_ZONE_B] = NSC_TIME_ZONE_OFFSET_B,
[NSC_TIME_ZONE_C] = NSC_TIME_ZONE_OFFSET_C,
[NSC_TIME_ZONE_D] = NSC_TIME_ZONE_OFFSET_D,
[NSC_TIME_ZONE_E] = NSC_TIME_ZONE_OFFSET_E,
[NSC_TIME_ZONE_F] = NSC_TIME_ZONE_OFFSET_F,
[NSC_TIME_ZONE_G] = NSC_TIME_ZONE_OFFSET_G,
[NSC_TIME_ZONE_H] = NSC_TIME_ZONE_OFFSET_H,
[NSC_TIME_ZONE_I] = NSC_TIME_ZONE_OFFSET_I,
[NSC_TIME_ZONE_K] = NSC_TIME_ZONE_OFFSET_K,
[NSC_TIME_ZONE_L] = NSC_TIME_ZONE_OFFSET_L,
[NSC_TIME_ZONE_M] = NSC_TIME_ZONE_OFFSET_M
};
/**
* Array of timezone names. Order does not matter.
*/
static const char * const timezones[NSC_TIME_ZONE__COUNT] = {
[NSC_TIME_ZONE_IDLE] = "IDLE",
[NSC_TIME_ZONE_NZST] = "NZST",
[NSC_TIME_ZONE_NZT] = "NZT",
[NSC_TIME_ZONE_EAST] = "EAST",
[NSC_TIME_ZONE_GST] = "GST",
[NSC_TIME_ZONE_JST] = "JST",
[NSC_TIME_ZONE_CCT] = "CCT",
[NSC_TIME_ZONE_WAST] = "WAST",
[NSC_TIME_ZONE_EET] = "EET",
[NSC_TIME_ZONE_CET] = "CET",
[NSC_TIME_ZONE_FWT] = "FWT",
[NSC_TIME_ZONE_MET] = "MET",
[NSC_TIME_ZONE_MEWT] = "MEWT",
[NSC_TIME_ZONE_GMT] = "GMT",
[NSC_TIME_ZONE_UTC] = "UTC",
[NSC_TIME_ZONE_WET] = "WET",
[NSC_TIME_ZONE_WAT] = "WAT",
[NSC_TIME_ZONE_AST] = "AST",
[NSC_TIME_ZONE_EST] = "EST",
[NSC_TIME_ZONE_CST] = "CST",
[NSC_TIME_ZONE_MST] = "MST",
[NSC_TIME_ZONE_PST] = "PST",
[NSC_TIME_ZONE_YST] = "YST",
[NSC_TIME_ZONE_AHST] = "AHST",
[NSC_TIME_ZONE_CAT] = "CAT",
[NSC_TIME_ZONE_HST] = "HST",
[NSC_TIME_ZONE_IDLW] = "IDLW",
[NSC_TIME_ZONE_NZDT] = "NZDT",
[NSC_TIME_ZONE_EADT] = "EADT",
[NSC_TIME_ZONE_WADT] = "WADT",
[NSC_TIME_ZONE_CEST] = "CEST",
[NSC_TIME_ZONE_FST] = "FST",
[NSC_TIME_ZONE_MEST] = "MEST",
[NSC_TIME_ZONE_MESZ] = "MESZ",
[NSC_TIME_ZONE_BST] = "BST",
[NSC_TIME_ZONE_ADT] = "ADT",
[NSC_TIME_ZONE_EDT] = "EDT",
[NSC_TIME_ZONE_CDT] = "CDT",
[NSC_TIME_ZONE_MDT] = "MDT",
[NSC_TIME_ZONE_PDT] = "PDT",
[NSC_TIME_ZONE_YDT] = "YDT",
[NSC_TIME_ZONE_HDT] = "HDT",
[NSC_TIME_ZONE_Y] = "Y",
[NSC_TIME_ZONE_X] = "X",
[NSC_TIME_ZONE_W] = "W",
[NSC_TIME_ZONE_V] = "V",
[NSC_TIME_ZONE_U] = "U",
[NSC_TIME_ZONE_T] = "T",
[NSC_TIME_ZONE_S] = "S",
[NSC_TIME_ZONE_R] = "R",
[NSC_TIME_ZONE_Q] = "Q",
[NSC_TIME_ZONE_P] = "P",
[NSC_TIME_ZONE_O] = "O",
[NSC_TIME_ZONE_N] = "N",
[NSC_TIME_ZONE_Z] = "Z",
[NSC_TIME_ZONE_A] = "A",
[NSC_TIME_ZONE_B] = "B",
[NSC_TIME_ZONE_C] = "C",
[NSC_TIME_ZONE_D] = "D",
[NSC_TIME_ZONE_E] = "E",
[NSC_TIME_ZONE_F] = "F",
[NSC_TIME_ZONE_G] = "G",
[NSC_TIME_ZONE_H] = "H",
[NSC_TIME_ZONE_I] = "I",
[NSC_TIME_ZONE_K] = "K",
[NSC_TIME_ZONE_L] = "L",
[NSC_TIME_ZONE_M] = "M"
};
/**
* Flags for tracking the components of a date that have been parsed.
*/
enum nsc_date_component_flags {
NSC_COMPONENT_FLAGS_NONE = 0,
NSC_COMPONENT_FLAGS_HAVE_YEARS = (1 << 0),
NSC_COMPONENT_FLAGS_HAVE_MONTHS = (1 << 1),
NSC_COMPONENT_FLAGS_HAVE_DAYS = (1 << 2),
NSC_COMPONENT_FLAGS_HAVE_HOURS = (1 << 3),
NSC_COMPONENT_FLAGS_HAVE_MINS = (1 << 4),
NSC_COMPONENT_FLAGS_HAVE_SECS = (1 << 5),
NSC_COMPONENT_FLAGS_HAVE_TIMEZONE = (1 << 6),
NSC_COMPONENT_FLAGS_HAVE_WEEKDAY = (1 << 7),
NSC_COMPONENT_FLAGS__HAVE_YYYYMMDD =
NSC_COMPONENT_FLAGS_HAVE_YEARS |
NSC_COMPONENT_FLAGS_HAVE_MONTHS |
NSC_COMPONENT_FLAGS_HAVE_DAYS,
NSC_COMPONENT_FLAGS__HAVE_HHMMSS =
NSC_COMPONENT_FLAGS_HAVE_HOURS |
NSC_COMPONENT_FLAGS_HAVE_MINS |
NSC_COMPONENT_FLAGS_HAVE_SECS,
NSC_COMPONENT_FLAGS__HAVE_ALL =
NSC_COMPONENT_FLAGS_HAVE_YEARS |
NSC_COMPONENT_FLAGS_HAVE_MONTHS |
NSC_COMPONENT_FLAGS_HAVE_DAYS |
NSC_COMPONENT_FLAGS_HAVE_HOURS |
NSC_COMPONENT_FLAGS_HAVE_MINS |
NSC_COMPONENT_FLAGS_HAVE_SECS |
NSC_COMPONENT_FLAGS_HAVE_TIMEZONE
};
/**
* Context for date parsing.
*/
struct nsc_date_parse_ctx {
char prev; /**< Used for handling neumenrical timezone */
uint8_t secs;
uint8_t mins;
uint8_t hours;
uint8_t day;
uint8_t month;
uint16_t years;
int16_t timezone_offset_mins;
};
/**
* Helper for testing whether any of the flags in mask are set.
*
* \param[in] flags Flags to to check.
* \param[in] mask The set of flags to check for in `flags`.
* \return true iff any flags in `mask` are set in `flags`, else false.
*/
static bool flags_chk(
enum nsc_date_component_flags flags,
enum nsc_date_component_flags mask)
{
return flags & mask;
}
/**
* Helper for testing whether all of the flags in mask are set.
*
* \param[in] flags Flags to to check.
* \param[in] mask The set of flags to check for in `flags`.
* \return true iff all flags in `mask` are set in `flags`, else false.
*/
static bool flags_chk_all(
enum nsc_date_component_flags flags,
enum nsc_date_component_flags mask)
{
return (flags & mask) == mask;
}
/**
* Test for a weekday name in a string (case insensitive).
*
* \param[in] str String to parse a weekday name in.
* \param[in] len Number of consecutive alphabetical characters.
* \param[in,out] flags Flags indicating which date components have been
* found in `str` already. If a weekday component
* is found, the weekday flag is set.
* \return true iff weekday component is found, else false.
*/
static inline bool time__parse_weekday(
const char *str,
size_t len,
enum nsc_date_component_flags *flags)
{
const char * const *names = (len == 3) ?
weekdays_short : weekdays_long;
if (flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_WEEKDAY)) {
return false;
}
for (uint32_t i = 0; i < NSC_TIME_WEEKDAY__COUNT; i++) {
if (ascii_strings_count_equal_caseless(names[i], str) == len) {
*flags |= NSC_COMPONENT_FLAGS_HAVE_WEEKDAY;
return true;
}
}
return false;
}
/**
* Attempt to parse a month name in a string (case insensitive).
*
* \param[in] str String to parse a month name in.
* \param[in] len Number of consecutive alphabetical characters.
* \param[in,out] flags Flags indicating which date components have been
* found in `str` already. If a month component
* is found, the month flag is set.
* \param[in,out] ctx Current date parsing context. If month component
* is found, the context's month value is set.
* \return true iff month name component is found, else false.
*/
static inline bool time__parse_month(
const char *str,
size_t len,
enum nsc_date_component_flags *flags,
struct nsc_date_parse_ctx *ctx)
{
if (flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_MONTHS)) {
return false;
}
for (uint32_t i = 0; i < NSC_TIME_MONTH__COUNT; i++) {
if (ascii_strings_count_equal_caseless(months[i], str) == len) {
*flags |= NSC_COMPONENT_FLAGS_HAVE_MONTHS;
ctx->month = i;
return true;
}
}
return false;
}
/**
* Attempt to parse a timezone name in a string (case insensitive).
*
* \param[in] str String to parse a timezone name in.
* \param[in] len Number of consecutive alphabetical characters.
* \param[in,out] flags Flags indicating which date components have been
* found in `str` already. If a timezone component
* is found, the timezone flag is set.
* \param[in,out] ctx Current date parsing context. If timezone component
* is found, the context's timezone value is set.
* \return true iff timezone name component is found, else false.
*/
static inline bool time__parse_timezone(
const char *str,
size_t len,
enum nsc_date_component_flags *flags,
struct nsc_date_parse_ctx *ctx)
{
if (flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_TIMEZONE)) {
return false;
}
for (uint32_t i = 0; i < NSC_TIME_ZONE__COUNT; i++) {
if (ascii_strings_count_equal_caseless(
timezones[i], str) == len) {
*flags |= NSC_COMPONENT_FLAGS_HAVE_TIMEZONE;
ctx->timezone_offset_mins = timezone_mins[i];
return true;
}
}
return false;
}
/**
* Attempt to parse an "hh:mm:ss" time from a string.
*
* \param[in] str String to parse a time in.
* \param[in,out] len The number of characters until the first non-digit.
* Iff a time component is found, updated to the number
* of comsumend characters.
* \param[in,out] flags Flags indicating which date components have been
* found in `str` already. If a time component
* is found, the hours, mins and secs flags are set.
* \param[in,out] ctx Current date parsing context. If time component
* is found, the context's time values are set.
* \return true iff time component is found, else false.
*/
static inline bool time__parse_hh_mm_ss(
const char *str,
size_t *len,
enum nsc_date_component_flags *flags,
struct nsc_date_parse_ctx *ctx)
{
size_t l;
if (*len != 2 || flags_chk(*flags, NSC_COMPONENT_FLAGS__HAVE_HHMMSS)) {
return false;
}
l = *len + ascii_count_digit_or_colon(str + *len);
if (l == 8) {
int h, m, s, count;
count = sscanf(str, "%02d:%02d:%02d", &h, &m, &s);
if (count == 3) {
ctx->hours = h;
ctx->mins = m;
ctx->secs = s;
*flags |= NSC_COMPONENT_FLAGS__HAVE_HHMMSS;
*len = l;
return true;
}
} else if (l == 5) {
int h, m, count;
count = sscanf(str, "%02d:%02d", &h, &m);
if (count == 2) {
ctx->hours = h;
ctx->mins = m;
ctx->secs = 0;
*flags |= NSC_COMPONENT_FLAGS__HAVE_HHMMSS;
*len = l;
return true;
}
}
return false;
}
/**
* Attempt to parse a number from a date string.
*
* How the number is treated depends on various things:
*
* - its character length,
* - its value,
* - which date components have already been parsed
*
* \param[in] str String to parse a time in.
* \param[in] len The number of characters until the first non-digit.
* \param[in,out] flags Flags indicating which date components have been
* found in `str` already. If any component is found,
* their flags are set.
* \param[in,out] ctx Current date parsing context. If any component
* is found, the appropriate context values are set.
* \return true iff a component is found, else false.
*/
static inline bool time__parse_number(
const char *str,
size_t len,
enum nsc_date_component_flags *flags,
struct nsc_date_parse_ctx *ctx)
{
int value;
if (len != ascii_string_to_int(str, &value)) {
return false;
}
switch (len) {
case 8:
if (!flags_chk(*flags, NSC_COMPONENT_FLAGS__HAVE_YYYYMMDD)) {
ctx->years = value / 10000;
ctx->month = (value % 10000) / 100 - 1;
ctx->day = value % 100 - 1;
*flags |= NSC_COMPONENT_FLAGS__HAVE_YYYYMMDD;
return true;
}
break;
case 4:
if (!flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_TIMEZONE)) {
if (ascii_is_sign(ctx->prev) && value <= 1400) {
ctx->timezone_offset_mins =
value / 100 * 60 +
value % 100;
if (ctx->prev == '+') {
ctx->timezone_offset_mins *= -1;
}
*flags |= NSC_COMPONENT_FLAGS_HAVE_TIMEZONE;
return true;
}
}
if (!flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_YEARS)) {
ctx->years = value;
*flags |= NSC_COMPONENT_FLAGS_HAVE_YEARS;
return true;
}
break;
case 2:
case 1:
if (!flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_DAYS) &&
value > 0 && value <= 31) {
ctx->day = value - 1;
*flags |= NSC_COMPONENT_FLAGS_HAVE_DAYS;
return true;
}
if (!flags_chk(*flags, NSC_COMPONENT_FLAGS_HAVE_YEARS)) {
ctx->years = (value > 70) ?
value + 1900 :
value + 2000;
*flags |= NSC_COMPONENT_FLAGS_HAVE_YEARS;
return true;
}
break;
default:
break;
}
return false;
}
/**
* Get number of leap days up until end of given year.
*
* \param[in] year Year to count leap years up to.
* \return Number of leap days up to end of `year`.
*/
static inline int time__get_leap_days(int year)
{
return (year / 4) - (year / 100) + (year / 400);
}
/**
* Helper to convert a date string context to a time_t.
*
* \param[in] ctx Current date parsing context.
* \param[in] flags Flags indicating which date components have been set.
* \param[out] time Returns the number of seconds since 1 Jan 1970 00:00 UTC.
* \return NSERROR_OK on success, appropriate error otherwise.
*/
static nserror time__ctx_to_time_t(
const struct nsc_date_parse_ctx *ctx,
enum nsc_date_component_flags flags,
time_t *time)
{
enum {
NSC_MONTH_DAYS_JAN = 31,
NSC_MONTH_DAYS_FEB = 28, /**< Leap years handled separatly */
NSC_MONTH_DAYS_MAR = 31,
NSC_MONTH_DAYS_APR = 30,
NSC_MONTH_DAYS_MAY = 31,
NSC_MONTH_DAYS_JUN = 30,
NSC_MONTH_DAYS_JUL = 31,
NSC_MONTH_DAYS_AUG = 31,
NSC_MONTH_DAYS_SEP = 30,
NSC_MONTH_DAYS_OCT = 31,
NSC_MONTH_DAYS_NOV = 30,
NSC_MONTH_DAYS_DEC = 31
};
enum {
NSC_MONTH_OFF_JAN = 0,
NSC_MONTH_OFF_FEB = NSC_MONTH_OFF_JAN + NSC_MONTH_DAYS_JAN,
NSC_MONTH_OFF_MAR = NSC_MONTH_OFF_FEB + NSC_MONTH_DAYS_FEB,
NSC_MONTH_OFF_APR = NSC_MONTH_OFF_MAR + NSC_MONTH_DAYS_MAR,
NSC_MONTH_OFF_MAY = NSC_MONTH_OFF_APR + NSC_MONTH_DAYS_APR,
NSC_MONTH_OFF_JUN = NSC_MONTH_OFF_MAY + NSC_MONTH_DAYS_MAY,
NSC_MONTH_OFF_JUL = NSC_MONTH_OFF_JUN + NSC_MONTH_DAYS_JUN,
NSC_MONTH_OFF_AUG = NSC_MONTH_OFF_JUL + NSC_MONTH_DAYS_JUL,
NSC_MONTH_OFF_SEP = NSC_MONTH_OFF_AUG + NSC_MONTH_DAYS_AUG,
NSC_MONTH_OFF_OCT = NSC_MONTH_OFF_SEP + NSC_MONTH_DAYS_SEP,
NSC_MONTH_OFF_NOV = NSC_MONTH_OFF_OCT + NSC_MONTH_DAYS_OCT,
NSC_MONTH_OFF_DEC = NSC_MONTH_OFF_NOV + NSC_MONTH_DAYS_NOV
};
static const uint16_t month_offsets[NSC_TIME_MONTH__COUNT] = {
[NSC_TIME_MONTH_JAN] = NSC_MONTH_OFF_JAN,
[NSC_TIME_MONTH_FEB] = NSC_MONTH_OFF_FEB,
[NSC_TIME_MONTH_MAR] = NSC_MONTH_OFF_MAR,
[NSC_TIME_MONTH_APR] = NSC_MONTH_OFF_APR,
[NSC_TIME_MONTH_MAY] = NSC_MONTH_OFF_MAY,
[NSC_TIME_MONTH_JUN] = NSC_MONTH_OFF_JUN,
[NSC_TIME_MONTH_JUL] = NSC_MONTH_OFF_JUL,
[NSC_TIME_MONTH_AUG] = NSC_MONTH_OFF_AUG,
[NSC_TIME_MONTH_SEP] = NSC_MONTH_OFF_SEP,
[NSC_TIME_MONTH_OCT] = NSC_MONTH_OFF_OCT,
[NSC_TIME_MONTH_NOV] = NSC_MONTH_OFF_NOV,
[NSC_TIME_MONTH_DEC] = NSC_MONTH_OFF_DEC
};
int year_days = (ctx->years - 1970) * 365;
int month_days = month_offsets[ctx->month];
int year = (ctx->month < NSC_TIME_MONTH_FEB) ?
ctx->years - 1 : ctx->years;
int leap_days = time__get_leap_days(year) - time__get_leap_days(1969);
int total_days = year_days + month_days + ctx->day + leap_days;
int mins = (int)ctx->mins + (int)ctx->timezone_offset_mins;
*time = (((((time_t)(total_days)) * 24) +
ctx->hours) * 60 +
mins) * 60 +
ctx->secs;
return NSERROR_OK;
}
/**
* Parse a date string to a `time_t`.
*
* \param[in] str String to parse.
* \param[out] time Returns the number of seconds since 1 Jan 1970 00:00 UTC.
* \return `NSERROR_OK` on success, else
* `NSERROR_INVALID` if the string parsing failed,
* appropriate error otherwise.
*/
static nserror time__get_date(const char *str, time_t *time)
{
enum nsc_date_component_flags flags = NSC_COMPONENT_FLAGS_NONE;
struct nsc_date_parse_ctx ctx = {
.prev = '\0',
.secs = 0,
.mins = 0,
.hours = 0,
.day = 0,
.month = 0,
.years = 0,
.timezone_offset_mins = 0
};
if (str == NULL || time == NULL) {
return NSERROR_BAD_PARAMETER;
}
/* Parse */
while (*str != '\0' &&
!flags_chk_all(flags, NSC_COMPONENT_FLAGS__HAVE_ALL)) {
size_t len = 1;
if (ascii_is_alpha(*str)) {
len += ascii_count_alpha(str + 1);
if (!time__parse_weekday(str, len, &flags) &&
!time__parse_month(str, len, &flags, &ctx) &&
!time__parse_timezone(str, len, &flags, &ctx)) {
return NSERROR_INVALID;
}
} else if (ascii_is_digit(*str)) {
len += ascii_count_digit(str + 1);
if (!time__parse_hh_mm_ss(str, &len, &flags, &ctx) &&
!time__parse_number(str, len, &flags, &ctx)) {
return NSERROR_INVALID;
}
}
ctx.prev = *str;
str += len;
}
/* The initial values of 0 are used if hours, mins, secs, and timezone
* are not found */
flags |= NSC_COMPONENT_FLAGS__HAVE_HHMMSS;
flags |= NSC_COMPONENT_FLAGS_HAVE_TIMEZONE;
/* Validate */
if (!flags_chk_all(flags, NSC_COMPONENT_FLAGS__HAVE_ALL)) {
return NSERROR_INVALID;
}
if (ctx.secs > 60 || ctx.mins > 59 || ctx.hours > 23 ||
ctx.day > 31 || ctx.month > 11) {
return NSERROR_INVALID;
}
/* Convert */
return time__ctx_to_time_t(&ctx, flags, time);
}
/* exported function documented in utils/time.h */
nserror nsc_strntimet(const char *str, size_t size, time_t *timep)
{
return time__get_date(str, timep);
}
# else
/* exported function documented in utils/time.h */
nserror nsc_strntimet(const char *str, size_t size, time_t *timep)
{
time_t result;
if (str == NULL || timep == NULL) {
return NSERROR_BAD_PARAMETER;
}
result = curl_getdate(str, NULL);
if (result == -1) {
return NSERROR_INVALID;
}
*timep = result;
return NSERROR_OK;
}
#endif
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