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/*
* meli - melib POSIX libc time interface
*
* Copyright 2020 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli 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, either version 3 of the License, or
* (at your option) any later version.
*
* meli 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 meli. If not, see <http://www.gnu.org/licenses/>.
*/
//! Functions for dealing with date strings and UNIX Epoch timestamps.
//!
//! # Examples
//!
//! ```rust
//! # use melib::datetime::*;
//! // Get current UNIX Epoch timestamp.
//! let now: UnixTimestamp = now();
//!
//! // Parse date from string
//! let date_val = "Wed, 8 Jan 2020 10:44:03 -0800";
//! let timestamp = rfc822_to_timestamp(date_val).unwrap();
//! assert_eq!(timestamp, 1578509043);
//!
//! // Convert timestamp back to string
//! let s = timestamp_to_string(timestamp, Some("%Y-%m-%d"), true);
//! assert_eq!(s, "2020-01-08");
//! ```
use crate::error::{Result, ResultIntoMeliError};
use std::borrow::Cow;
use std::convert::TryInto;
use std::ffi::{CStr, CString};
pub type UnixTimestamp = u64;
pub const RFC3339_FMT_WITH_TIME: &str = "%Y-%m-%dT%H:%M:%S\0";
pub const RFC3339_FMT: &str = "%Y-%m-%d\0";
pub const RFC822_DATE: &str = "%a, %d %b %Y %H:%M:%S %z\0";
pub const RFC822_FMT_WITH_TIME: &str = "%a, %e %h %Y %H:%M:%S \0";
pub const RFC822_FMT: &str = "%e %h %Y %H:%M:%S \0";
pub const DEFAULT_FMT: &str = "%a, %d %b %Y %R\0";
//"Tue May 21 13:46:22 1991\n"
pub const ASCTIME_FMT: &str = "%a %b %d %H:%M:%S %Y\n\0";
extern "C" {
fn strptime(
s: *const std::os::raw::c_char,
format: *const std::os::raw::c_char,
tm: *mut libc::tm,
) -> *const std::os::raw::c_char;
fn strftime(
s: *mut std::os::raw::c_char,
max: libc::size_t,
format: *const std::os::raw::c_char,
tm: *const libc::tm,
) -> libc::size_t;
fn mktime(tm: *const libc::tm) -> libc::time_t;
fn localtime_r(timep: *const libc::time_t, tm: *mut libc::tm) -> *mut libc::tm;
fn gettimeofday(tv: *mut libc::timeval, tz: *mut libc::timezone) -> i32;
}
#[cfg(not(target_os = "netbsd"))]
struct Locale {
new_locale: libc::locale_t,
old_locale: libc::locale_t,
}
#[cfg(target_os = "netbsd")]
struct Locale {
mask: std::os::raw::c_int,
old_locale: *const std::os::raw::c_char,
}
impl Drop for Locale {
fn drop(&mut self) {
#[cfg(not(target_os = "netbsd"))]
unsafe {
let _ = libc::uselocale(self.old_locale);
libc::freelocale(self.new_locale);
}
#[cfg(target_os = "netbsd")]
unsafe {
let _ = libc::setlocale(self.mask, self.old_locale);
}
}
}
// How to unit test this? Test machine is not guaranteed to have non-english locales.
impl Locale {
#[cfg(not(target_os = "netbsd"))]
fn new(
mask: std::os::raw::c_int,
locale: *const std::os::raw::c_char,
base: libc::locale_t,
) -> Result<Self> {
let new_locale = unsafe { libc::newlocale(mask, locale, base) };
if new_locale.is_null() {
return Err(nix::Error::last().into());
}
let old_locale = unsafe { libc::uselocale(new_locale) };
if old_locale.is_null() {
unsafe { libc::freelocale(new_locale) };
return Err(nix::Error::last().into());
}
Ok(Locale {
new_locale,
old_locale,
})
}
#[cfg(target_os = "netbsd")]
fn new(
mask: std::os::raw::c_int,
locale: *const std::os::raw::c_char,
_base: libc::locale_t,
) -> Result<Self> {
let old_locale = unsafe { libc::setlocale(mask, std::ptr::null_mut()) };
if old_locale.is_null() {
return Err(nix::Error::last().into());
}
let new_locale = unsafe { libc::setlocale(mask, locale) };
if new_locale.is_null() {
return Err(nix::Error::last().into());
}
Ok(Locale { mask, old_locale })
}
}
pub fn timestamp_to_string(timestamp: UnixTimestamp, fmt: Option<&str>, posix: bool) -> String {
let mut new_tm: libc::tm = unsafe { std::mem::zeroed() };
unsafe {
let i: i64 = timestamp.try_into().unwrap_or(0);
localtime_r(&i as *const i64, &mut new_tm as *mut libc::tm);
}
let format: Cow<'_, CStr> = if let Some(cs) = fmt
.map(str::as_bytes)
.map(CStr::from_bytes_with_nul)
.and_then(|res| res.ok())
{
Cow::from(cs)
} else if let Some(cstring) = fmt
.map(str::as_bytes)
.map(CString::new)
.and_then(|res| res.ok())
{
Cow::from(cstring)
} else {
unsafe { CStr::from_bytes_with_nul_unchecked(DEFAULT_FMT.as_bytes()).into() }
};
let mut vec: [u8; 256] = [0; 256];
let ret = {
let _with_locale: Option<Result<Locale>> = if posix {
Some(
Locale::new(
libc::LC_TIME,
b"C\0".as_ptr() as *const i8,
std::ptr::null_mut(),
)
.chain_err_summary(|| "Could not set locale for datetime conversion")
.chain_err_kind(crate::error::ErrorKind::External),
)
} else {
None
};
unsafe {
strftime(
vec.as_mut_ptr() as *mut _,
256,
format.as_ptr(),
&new_tm as *const _,
)
}
};
String::from_utf8_lossy(&vec[0..ret]).into_owned()
}
fn tm_to_secs(tm: libc::tm) -> std::result::Result<i64, ()> {
let mut is_leap = false;
let mut year = tm.tm_year;
let mut month = tm.tm_mon;
if !(0..12).contains(&month) {
let mut adj = month / 12;
month %= 12;
if month < 0 {
adj -= 1;
month += 12;
}
year += adj;
}
let mut t = year_to_secs(year.into(), &mut is_leap)?;
t += month_to_secs(month.try_into().unwrap_or(0), is_leap);
t += 86400 * (tm.tm_mday - 1) as i64;
t += 3600 * (tm.tm_hour) as i64;
t += 60 * (tm.tm_min) as i64;
t += tm.tm_sec as i64;
Ok(t)
}
fn year_to_secs(year: i64, is_leap: &mut bool) -> std::result::Result<i64, ()> {
if year < -100 {
/* Sorry time travelers. */
return Err(());
}
if year - 2 <= 136 {
let y = year;
let mut leaps = (y - 68) >> 2;
if (y - 68) & 3 == 0 {
leaps -= 1;
*is_leap = true;
} else {
*is_leap = false;
}
return Ok(31536000 * (y - 70) + 86400 * leaps);
}
let cycles = (year - 100) / 400;
let centuries;
let mut leaps;
let mut rem;
rem = (year - 100) % 400;
if rem == 0 {
*is_leap = true;
centuries = 0;
leaps = 0;
} else {
if rem >= 200 {
if rem >= 300 {
centuries = 3;
rem -= 300;
} else {
centuries = 2;
rem -= 200;
}
} else if rem >= 100 {
centuries = 1;
rem -= 100;
} else {
centuries = 0;
}
if rem == 0 {
*is_leap = false;
leaps = 0;
} else {
leaps = rem / 4;
rem %= 4;
*is_leap = rem == 0;
}
}
leaps += 97 * cycles + 24 * centuries - if *is_leap { 1 } else { 0 };
match (year - 100).overflowing_mul(31536000) {
(_, true) => Err(()),
(res, false) => Ok(res + leaps * 86400 + 946684800 + 86400),
}
}
fn month_to_secs(month: usize, is_leap: bool) -> i64 {
const SECS_THROUGH_MONTH: [i64; 12] = [
0,
31 * 86400,
59 * 86400,
90 * 86400,
120 * 86400,
151 * 86400,
181 * 86400,
212 * 86400,
243 * 86400,
273 * 86400,
304 * 86400,
334 * 86400,
];
let mut t = SECS_THROUGH_MONTH[month];
if is_leap && month >= 2 {
t += 86400;
}
t
}
pub fn rfc822_to_timestamp<T>(s: T) -> Result<UnixTimestamp>
where
T: Into<Vec<u8>>,
{
let s = CString::new(s)?;
let mut new_tm: libc::tm = unsafe { std::mem::zeroed() };
for fmt in &[RFC822_FMT_WITH_TIME, RFC822_FMT] {
let fmt = unsafe { CStr::from_bytes_with_nul_unchecked(fmt.as_bytes()) };
let ret = {
let _with_locale = Locale::new(
libc::LC_TIME,
b"C\0".as_ptr() as *const i8,
std::ptr::null_mut(),
)
.chain_err_summary(|| "Could not set locale for datetime conversion")
.chain_err_kind(crate::error::ErrorKind::External)?;
unsafe { strptime(s.as_ptr(), fmt.as_ptr(), &mut new_tm as *mut _) }
};
if ret.is_null() {
continue;
}
let rest = unsafe { CStr::from_ptr(ret) };
let tm_gmtoff = if rest.to_bytes().len() > 4
&& rest.to_bytes().is_ascii()
&& rest.to_bytes()[1..5].iter().all(u8::is_ascii_digit)
{
// safe since rest.to_bytes().is_ascii()
let offset = unsafe { std::str::from_utf8_unchecked(&rest.to_bytes()[0..5]) };
if let (Ok(mut hr_offset), Ok(mut min_offset)) =
(offset[1..3].parse::<i64>(), offset[3..5].parse::<i64>())
{
if rest.to_bytes()[0] == b'-' {
hr_offset = -hr_offset;
min_offset = -min_offset;
}
hr_offset * 60 * 60 + min_offset * 60
} else {
0
}
} else {
let rest = if rest.to_bytes().starts_with(b"(") && rest.to_bytes().ends_with(b")") {
&rest.to_bytes()[1..rest.to_bytes().len() - 1]
} else {
rest.to_bytes()
};
if let Ok(idx) = TIMEZONE_ABBR.binary_search_by(|probe| probe.0.cmp(rest)) {
let (hr_offset, min_offset) = TIMEZONE_ABBR[idx].1;
(hr_offset as i64) * 60 * 60 + (min_offset as i64) * 60
} else {
0
}
};
return Ok(tm_to_secs(new_tm)
.map(|res| (res - tm_gmtoff) as u64)
.unwrap_or(0));
}
Ok(0)
}
pub fn rfc3339_to_timestamp<T>(s: T) -> Result<UnixTimestamp>
where
T: Into<Vec<u8>>,
{
let s = CString::new(s)?;
let mut new_tm: libc::tm = unsafe { std::mem::zeroed() };
for fmt in &[RFC3339_FMT_WITH_TIME, RFC3339_FMT] {
let fmt = unsafe { CStr::from_bytes_with_nul_unchecked(fmt.as_bytes()) };
let ret = {
let _with_locale = Locale::new(
libc::LC_TIME,
b"C\0".as_ptr() as *const i8,
std::ptr::null_mut(),
)
.chain_err_summary(|| "Could not set locale for datetime conversion")
.chain_err_kind(crate::error::ErrorKind::External)?;
unsafe { strptime(s.as_ptr(), fmt.as_ptr(), &mut new_tm as *mut _) }
};
if ret.is_null() {
continue;
}
let rest = unsafe { CStr::from_ptr(ret) };
let tm_gmtoff = if rest.to_bytes().len() > 4
&& rest.to_bytes().is_ascii()
&& rest.to_bytes()[1..3].iter().all(u8::is_ascii_digit)
&& rest.to_bytes()[4..6].iter().all(u8::is_ascii_digit)
{
// safe since rest.to_bytes().is_ascii()
let offset = unsafe { std::str::from_utf8_unchecked(&rest.to_bytes()[0..6]) };
if let (Ok(mut hr_offset), Ok(mut min_offset)) =
(offset[1..3].parse::<i64>(), offset[4..6].parse::<i64>())
{
if rest.to_bytes()[0] == b'-' {
hr_offset = -hr_offset;
min_offset = -min_offset;
}
hr_offset * 60 * 60 + min_offset * 60
} else {
0
}
} else {
let rest = if rest.to_bytes().starts_with(b"(") && rest.to_bytes().ends_with(b")") {
&rest.to_bytes()[1..rest.to_bytes().len() - 1]
} else {
rest.to_bytes()
};
if let Ok(idx) = TIMEZONE_ABBR.binary_search_by(|probe| probe.0.cmp(rest)) {
let (hr_offset, min_offset) = TIMEZONE_ABBR[idx].1;
(hr_offset as i64) * 60 * 60 + (min_offset as i64) * 60
} else {
0
}
};
return Ok(tm_to_secs(new_tm)
.map(|res| (res - tm_gmtoff) as u64)
.unwrap_or(0));
}
Ok(0)
}
// FIXME: Handle non-local timezone?
pub fn timestamp_from_string<T>(s: T, fmt: &str) -> Result<Option<UnixTimestamp>>
where
T: Into<Vec<u8>>,
{
let mut new_tm: libc::tm = unsafe { std::mem::zeroed() };
let fmt: Cow<'_, CStr> = if let Ok(cs) = CStr::from_bytes_with_nul(fmt.as_bytes()) {
Cow::from(cs)
} else {
Cow::from(CString::new(fmt.as_bytes())?)
};
unsafe {
let ret = strptime(
CString::new(s)?.as_ptr(),
fmt.as_ptr(),
&mut new_tm as *mut _,
);
if ret.is_null() {
return Ok(None);
}
Ok(Some(mktime(&new_tm as *const _) as u64))
}
}
pub fn now() -> UnixTimestamp {
use std::mem::MaybeUninit;
let mut tv = MaybeUninit::<libc::timeval>::uninit();
let mut tz = MaybeUninit::<libc::timezone>::uninit();
unsafe {
let ret = gettimeofday(tv.as_mut_ptr(), tz.as_mut_ptr());
if ret == -1 {
unreachable!("gettimeofday returned -1");
}
(tv.assume_init()).tv_sec as UnixTimestamp
}
}
#[test]
fn test_datetime_timestamp() {
timestamp_to_string(0, None, false);
}
#[test]
fn test_datetime_rfcs() {
if unsafe { libc::setlocale(libc::LC_ALL, b"\0".as_ptr() as _) }.is_null() {
println!("Unable to set locale.");
}
/* Some tests were lazily stolen from https://rachelbythebay.com/w/2013/06/11/time/ */
assert_eq!(
rfc822_to_timestamp("Wed, 8 Jan 2020 10:44:03 -0800").unwrap(),
1578509043
);
/*
macro_rules! mkt {
($year:literal, $month:literal, $day:literal, $hour:literal, $minute:literal, $second:literal) => {
libc::tm {
tm_sec: $second,
tm_min: $minute,
tm_hour: $hour,
tm_mday: $day,
tm_mon: $month - 1,
tm_year: $year - 1900,
tm_wday: 0,
tm_yday: 0,
tm_isdst: 0,
tm_gmtoff: 0,
tm_zone: std::ptr::null(),
}
};
}
*/
//unsafe { __tm_to_secs(&mkt!(2009, 02, 13, 23, 31, 30) as *const _) },
assert_eq!(
rfc822_to_timestamp("Fri, 13 Feb 2009 15:31:30 -0800").unwrap(),
1234567890
);
//unsafe { __tm_to_secs(&mkt!(2931, 05, 05, 00, 33, 09) as *const _) },
assert_eq!(
rfc822_to_timestamp("Sat, 05 May 2931 00:33:09 +0000").unwrap(),
30336942789
);
//2214-11-06 20:05:12 = 7726651512 [OK]
assert_eq!(
rfc822_to_timestamp("Sun, 06 Nov 2214 17:05:12 -0300").unwrap(), //2214-11-06 20:05:12
7726651512
);
assert_eq!(
rfc822_to_timestamp("Sun, 06 Nov 2214 17:05:12 -0300").unwrap(), //2214-11-06 20:05:12
rfc822_to_timestamp("Sun, 06 Nov 2214 17:05:12 (ADT)").unwrap(), //2214-11-06 20:05:12
);
//2661-11-06 06:38:02 = 21832612682 [OK]
assert_eq!(
rfc822_to_timestamp("Wed, 06 Nov 2661 06:38:02 +0000").unwrap(), //2661-11-06 06:38:02
21832612682
);
//2508-12-09 04:27:08 = 17007251228 [OK]
assert_eq!(
rfc822_to_timestamp("Sun, 09 Dec 2508 04:27:08 +0000").unwrap(), //2508-12-09 04:27:08
17007251228
);
//2375-11-07 05:08:24 = 12807349704 [OK]
assert_eq!(
rfc822_to_timestamp("Fri, 07 Nov 2375 05:08:24 +0000").unwrap(), //2375-11-07 05:08:24
12807349704
);
//2832-09-03 02:46:10 = 27223353970 [OK]
assert_eq!(
rfc822_to_timestamp("Fri, 03 Sep 2832 02:46:10 +0000").unwrap(), //2832-09-03 02:46:10
27223353970
);
//2983-02-25 12:47:17 = 31972020437 [OK]
assert_eq!(
rfc822_to_timestamp("Tue, 25 Feb 2983 15:47:17 +0300").unwrap(), //2983-02-25 12:47:17
31972020437
);
assert_eq!(
rfc822_to_timestamp("Thu, 30 Mar 2017 17:32:06 +0300 (EEST)").unwrap(),
1490884326
);
assert_eq!(
rfc822_to_timestamp("Mon, 24 Apr 2017 17:36:34 +0530").unwrap(),
1493035594
);
assert_eq!(
rfc822_to_timestamp("Mon, 24 Apr 2017 17:36:34 +0530").unwrap(),
rfc822_to_timestamp("Mon, 24 Apr 2017 12:06:34 +0000").unwrap(),
);
assert_eq!(
rfc822_to_timestamp("Mon, 24 Apr 2017 17:36:34 +0530").unwrap(),
rfc822_to_timestamp("Mon, 24 Apr 2017 17:36:34 (SLST)").unwrap(),
);
assert_eq!(
rfc822_to_timestamp("Mon, 24 Apr 2017 17:36:34 +0530").unwrap(),
rfc822_to_timestamp("Mon, 24 Apr 2017 17:36:34 SLST").unwrap(),
);
assert_eq!(
rfc822_to_timestamp("27 Dec 2019 14:42:46 +0100").unwrap(),
1577454166
);
assert_eq!(
rfc822_to_timestamp("Mon, 16 Mar 2020 10:23:01 +0200").unwrap(),
1584346981
);
}
#[allow(clippy::zero_prefixed_literal)]
const TIMEZONE_ABBR: &[(&[u8], (i8, i8))] = &[
(b"ACDT", (10, 30)),
(b"ACST", (09, 30)),
(b"ACT", (-05, 0)),
(b"ACWST", (08, 45)),
(b"ADT", (-03, 0)),
(b"AEDT", (11, 0)),
(b"AEST", (10, 0)),
(b"AFT", (04, 30)),
(b"AKDT", (-08, 0)),
(b"AKST", (-09, 0)),
(b"ALMT", (06, 0)),
(b"AMST", (-03, 0)),
(b"AMT", (-04, 0)), /* Amazon Time */
(b"ANAT", (12, 0)),
(b"AQTT", (05, 0)),
(b"ART", (-03, 0)),
(b"AST", (-04, 0)),
(b"AST", (03, 0)),
(b"AWST", (08, 0)),
(b"AZOST", (0, 0)),
(b"AZOT", (-01, 0)),
(b"AZT", (04, 0)),
(b"BDT", (08, 0)),
(b"BIOT", (06, 0)),
(b"BIT", (-12, 0)),
(b"BOT", (-04, 0)),
(b"BRST", (-02, 0)),
(b"BRT", (-03, 0)),
(b"BST", (06, 0)),
(b"BTT", (06, 0)),
(b"CAT", (02, 0)),
(b"CCT", (06, 30)),
(b"CDT", (-05, 0)),
(b"CEST", (02, 0)),
(b"CET", (01, 0)),
(b"CHADT", (13, 45)),
(b"CHAST", (12, 45)),
(b"CHOST", (09, 0)),
(b"CHOT", (08, 0)),
(b"CHST", (10, 0)),
(b"CHUT", (10, 0)),
(b"CIST", (-08, 0)),
(b"CIT", (08, 0)),
(b"CKT", (-10, 0)),
(b"CLST", (-03, 0)),
(b"CLT", (-04, 0)),
(b"COST", (-04, 0)),
(b"COT", (-05, 0)),
(b"CST", (-06, 0)),
(b"CT", (08, 0)),
(b"CVT", (-01, 0)),
(b"CWST", (08, 45)),
(b"CXT", (07, 0)),
(b"DAVT", (07, 0)),
(b"DDUT", (10, 0)),
(b"DFT", (01, 0)),
(b"EASST", (-05, 0)),
(b"EAST", (-06, 0)),
(b"EAT", (03, 0)),
(b"ECT", (-05, 0)),
(b"EDT", (-04, 0)),
(b"EEST", (03, 0)),
(b"EET", (02, 0)),
(b"EGST", (0, 0)),
(b"EGT", (-01, 0)),
(b"EIT", (09, 0)),
(b"EST", (-05, 0)),
(b"FET", (03, 0)),
(b"FJT", (12, 0)),
(b"FKST", (-03, 0)),
(b"FKT", (-04, 0)),
(b"FNT", (-02, 0)),
(b"GALT", (-06, 0)),
(b"GAMT", (-09, 0)),
(b"GET", (04, 0)),
(b"GFT", (-03, 0)),
(b"GILT", (12, 0)),
(b"GIT", (-09, 0)),
(b"GMT", (0, 0)),
(b"GST", (04, 0)),
(b"GYT", (-04, 0)),
(b"HAEC", (02, 0)),
(b"HDT", (-09, 0)),
(b"HKT", (08, 0)),
(b"HMT", (05, 0)),
(b"HOVST", (08, 0)),
(b"HOVT", (07, 0)),
(b"HST", (-10, 0)),
(b"ICT", (07, 0)),
(b"IDLW", (-12, 0)),
(b"IDT", (03, 0)),
(b"IOT", (03, 0)),
(b"IRDT", (04, 30)),
(b"IRKT", (08, 0)),
(b"IRST", (03, 30)),
(b"IST", (05, 30)),
(b"JST", (09, 0)),
(b"KALT", (02, 0)),
(b"KGT", (06, 0)),
(b"KOST", (11, 0)),
(b"KRAT", (07, 0)),
(b"KST", (09, 0)),
(b"LHST", (10, 30)),
(b"LINT", (14, 0)),
(b"MAGT", (12, 0)),
(b"MART", (-09, -30)),
(b"MAWT", (05, 0)),
(b"MDT", (-06, 0)),
(b"MEST", (02, 0)),
(b"MET", (01, 0)),
(b"MHT", (12, 0)),
(b"MIST", (11, 0)),
(b"MIT", (-09, -30)),
(b"MMT", (06, 30)),
(b"MSK", (03, 0)),
(b"MST", (08, 0)),
(b"MUT", (04, 0)),
(b"MVT", (05, 0)),
(b"MYT", (08, 0)),
(b"NCT", (11, 0)),
(b"NDT", (-02, -30)),
(b"NFT", (11, 0)),
(b"NOVT", (07, 0)),
(b"NPT", (05, 45)),
(b"NST", (-03, -30)),
(b"NT", (-03, -30)),
(b"NUT", (-11, 0)),
(b"NZDT", (13, 0)),
(b"NZST", (12, 0)),
(b"OMST", (06, 0)),
(b"ORAT", (05, 0)),
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(b"SRET", (11, 0)),
(b"SRT", (-03, 0)),
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(b"YEKT", (05, 0)),
];