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/*
* Copyright (C) 2014-2017 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "TimeParser.hxx"
#include "Compiler.h"
#include <stdexcept>
#include <assert.h>
#include <time.h>
#if !defined(__GLIBC__) && !defined(WIN32)
/**
* Determine the time zone offset in a portable way.
*/
gcc_const
static time_t
GetTimeZoneOffset() noexcept
{
time_t t = 1234567890;
struct tm tm;
tm.tm_isdst = 0;
gmtime_r(&t, &tm);
return t - mktime(&tm);
}
#endif
std::chrono::system_clock::time_point
ParseTimePoint(const char *s, const char *format)
{
assert(s != nullptr);
assert(format != nullptr);
#ifdef WIN32
/* TODO: emulate strptime()? */
(void)s;
(void)format;
throw std::runtime_error("Time parsing not implemented on Windows");
#else
struct tm tm;
const char *end = strptime(s, format, &tm);
if (end == nullptr || *end != 0)
throw std::runtime_error("Failed to parse time stamp");
#ifdef __GLIBC__
/* timegm() is a GNU extension */
const auto t = timegm(&tm);
#else
tm.tm_isdst = 0;
const auto t = mktime(&tm) + GetTimeZoneOffset();
#endif /* !__GLIBC__ */
return std::chrono::system_clock::from_time_t(t);
#endif /* !WIN32 */
}
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