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138 lines
4.4 KiB
C++
138 lines
4.4 KiB
C++
/**
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* Copyright (c) 2020, Timothy Stack
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*
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* All rights reserved.
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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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file date_time_scanner.hh
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*/
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#ifndef lnav_date_time_scanner_hh
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#define lnav_date_time_scanner_hh
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#include <string>
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#include <sys/types.h>
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#include <time.h>
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#include "time_util.hh"
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/**
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* Scans a timestamp string to discover the date-time format using the custom
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* ptimec parser. Once a format is found, it is locked in so that the next
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* time a timestamp needs to be scanned, the format does not have to be
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* rediscovered. The discovered date-time format can also be used to convert
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* an exttm struct to a string using the ftime() method.
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*/
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struct date_time_scanner {
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date_time_scanner()
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{
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this->clear();
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};
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void clear()
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{
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this->dts_base_time = 0;
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memset(&this->dts_base_tm, 0, sizeof(this->dts_base_tm));
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this->dts_fmt_lock = -1;
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this->dts_fmt_len = -1;
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};
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/**
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* Unlock this scanner so that the format is rediscovered.
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*/
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void unlock()
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{
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this->dts_fmt_lock = -1;
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this->dts_fmt_len = -1;
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}
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void set_base_time(time_t base_time)
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{
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this->dts_base_time = base_time;
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localtime_r(&base_time, &this->dts_base_tm.et_tm);
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};
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/**
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* Convert a timestamp to local time.
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*
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* Calling localtime_r is slow since it wants to lookup the timezone on
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* every call, so we cache the result and only call it again if the
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* requested time falls outside of a fifteen minute range.
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*/
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void to_localtime(time_t t, struct exttm& tm_out);
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bool dts_keep_base_tz{false};
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bool dts_local_time{false};
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time_t dts_base_time{0};
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struct exttm dts_base_tm;
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int dts_fmt_lock{-1};
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int dts_fmt_len{-1};
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time_t dts_local_offset_cache{0};
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time_t dts_local_offset_valid{0};
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time_t dts_local_offset_expiry{0};
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static const int EXPIRE_TIME = 15 * 60;
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const char* scan(const char* time_src,
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size_t time_len,
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const char* const time_fmt[],
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struct exttm* tm_out,
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struct timeval& tv_out,
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bool convert_local = true);
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size_t ftime(char* dst, size_t len, const struct exttm& tm) const;
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bool convert_to_timeval(const char* time_src,
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ssize_t time_len,
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const char* const time_fmt[],
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struct timeval& tv_out)
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{
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struct exttm tm;
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if (time_len == -1) {
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time_len = strlen(time_src);
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}
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if (this->scan(time_src, time_len, time_fmt, &tm, tv_out) != nullptr) {
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return true;
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}
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return false;
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};
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bool convert_to_timeval(const std::string& time_src, struct timeval& tv_out)
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{
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struct exttm tm;
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if (this->scan(time_src.c_str(), time_src.size(), nullptr, &tm, tv_out)
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!= nullptr)
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{
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return true;
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}
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return false;
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}
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};
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#endif
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