From 62e4c68907d8d33709c2c1f92a161dff00b3d5f2 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 15 Apr 2024 22:01:36 +0200 Subject: Adding upstream version 0.11.2. Signed-off-by: Daniel Baumann --- src/base/date_time_scanner.hh | 137 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 src/base/date_time_scanner.hh (limited to 'src/base/date_time_scanner.hh') diff --git a/src/base/date_time_scanner.hh b/src/base/date_time_scanner.hh new file mode 100644 index 0000000..90eaffa --- /dev/null +++ b/src/base/date_time_scanner.hh @@ -0,0 +1,137 @@ +/** + * Copyright (c) 2020, Timothy Stack + * + * All rights reserved. + * + * 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. + * * Neither the name of Timothy Stack nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + * + * @file date_time_scanner.hh + */ + +#ifndef lnav_date_time_scanner_hh +#define lnav_date_time_scanner_hh + +#include +#include + +#include + +#include "time_util.hh" + +/** + * Scans a timestamp string to discover the date-time format using the custom + * ptimec parser. Once a format is found, it is locked in so that the next + * time a timestamp needs to be scanned, the format does not have to be + * rediscovered. The discovered date-time format can also be used to convert + * an exttm struct to a string using the ftime() method. + */ +struct date_time_scanner { + date_time_scanner() { this->clear(); } + + void clear() + { + this->dts_base_time = 0; + this->dts_base_tm = exttm{}; + this->dts_fmt_lock = -1; + this->dts_fmt_len = -1; + this->dts_last_tv = timeval{}; + this->dts_last_tm = exttm{}; + } + + /** + * Unlock this scanner so that the format is rediscovered. + */ + void unlock() + { + this->dts_fmt_lock = -1; + this->dts_fmt_len = -1; + } + + void set_base_time(time_t base_time, const tm& local_tm); + + /** + * Convert a timestamp to local time. + * + * Calling localtime_r is slow since it wants to lookup the timezone on + * every call, so we cache the result and only call it again if the + * requested time falls outside of a fifteen minute range. + */ + void to_localtime(time_t t, struct exttm& tm_out); + + bool dts_keep_base_tz{false}; + bool dts_local_time{false}; + time_t dts_base_time{0}; + struct exttm dts_base_tm; + int dts_fmt_lock{-1}; + int dts_fmt_len{-1}; + struct exttm dts_last_tm {}; + struct timeval dts_last_tv {}; + time_t dts_local_offset_cache{0}; + time_t dts_local_offset_valid{0}; + time_t dts_local_offset_expiry{0}; + + static const int EXPIRE_TIME = 15 * 60; + + const char* scan(const char* time_src, + size_t time_len, + const char* const time_fmt[], + struct exttm* tm_out, + struct timeval& tv_out, + bool convert_local = true); + + size_t ftime(char* dst, + size_t len, + const char* const time_fmt[], + const struct exttm& tm) const; + + bool convert_to_timeval(const char* time_src, + ssize_t time_len, + const char* const time_fmt[], + struct timeval& tv_out) + { + struct exttm tm; + + if (time_len == -1) { + time_len = strlen(time_src); + } + if (this->scan(time_src, time_len, time_fmt, &tm, tv_out) != nullptr) { + return true; + } + return false; + } + + bool convert_to_timeval(const std::string& time_src, struct timeval& tv_out) + { + struct exttm tm; + + if (this->scan(time_src.c_str(), time_src.size(), nullptr, &tm, tv_out) + != nullptr) + { + return true; + } + return false; + } +}; + +#endif -- cgit v1.2.3