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