source: src/libcfa/time @ 460bd3a

//
// Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// time --
//
// Author           : Peter A. Buhr
// Created On       : Wed Mar 14 23:18:57 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Mon Jul  2 21:28:38 2018
// Update Count     : 641
//

#pragma once

// http://en.cppreference.com/w/cpp/header/chrono
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r5.html#refcc

#include <time.h>                                                                               // timespec
extern "C" {
#include <sys/time.h>                                                                   // timeval
}
#include <time_t.h>                                                                             // Duration/Time types

enum { TIMEGRAN = 1_000_000_000LL };                                    // nanosecond granularity, except for timeval

//######################### Duration #########################

static inline {
        Duration ?=?( Duration & dur, zero_t ) { return dur{ 0 }; }

        Duration +?( Duration rhs ) with( rhs ) {       return (Duration)@{ +tv }; }
        Duration ?+?( Duration & lhs, Duration rhs ) { return (Duration)@{ lhs.tv + rhs.tv }; }
        Duration ?+=?( Duration & lhs, Duration rhs ) { lhs = lhs + rhs; return lhs; }

        Duration -?( Duration rhs ) with( rhs ) { return (Duration)@{ -tv }; }
        Duration ?-?( Duration & lhs, Duration rhs ) { return (Duration)@{ lhs.tv - rhs.tv }; }
        Duration ?-=?( Duration & lhs, Duration rhs ) { lhs = lhs - rhs; return lhs; }

        Duration ?*?( Duration lhs, int64_t rhs ) { return (Duration)@{ lhs.tv * rhs }; }
        Duration ?*?( int64_t lhs, Duration rhs ) { return (Duration)@{ lhs * rhs.tv }; }
        Duration ?*=?( Duration & lhs, int64_t rhs ) { lhs = lhs * rhs; return lhs; }

        int64_t ?/?( Duration lhs, Duration rhs ) { return lhs.tv / rhs.tv; }
        Duration ?/?( Duration lhs, int64_t rhs ) { return (Duration)@{ lhs.tv / rhs }; }
        Duration ?/=?( Duration & lhs, int64_t rhs ) { lhs = lhs / rhs; return lhs; }
        double div( Duration lhs, Duration rhs ) { return (double)lhs.tv / (double)rhs.tv; }

        Duration ?%?( Duration lhs, Duration rhs ) { return (Duration)@{ lhs.tv % rhs.tv }; }
        Duration ?%=?( Duration & lhs, Duration rhs ) { lhs = lhs % rhs; return lhs; }

        _Bool ?==?( Duration lhs, Duration rhs ) { return lhs.tv == rhs.tv; }
        _Bool ?!=?( Duration lhs, Duration rhs ) { return lhs.tv != rhs.tv; }
        _Bool ?<? ( Duration lhs, Duration rhs ) { return lhs.tv <  rhs.tv; }
        _Bool ?<=?( Duration lhs, Duration rhs ) { return lhs.tv <= rhs.tv; }
        _Bool ?>? ( Duration lhs, Duration rhs ) { return lhs.tv >  rhs.tv; }
        _Bool ?>=?( Duration lhs, Duration rhs ) { return lhs.tv >= rhs.tv; }

        _Bool ?==?( Duration lhs, zero_t ) { return lhs.tv == 0; }
        _Bool ?!=?( Duration lhs, zero_t ) { return lhs.tv != 0; }
        _Bool ?<? ( Duration lhs, zero_t ) { return lhs.tv <  0; }
        _Bool ?<=?( Duration lhs, zero_t ) { return lhs.tv <= 0; }
        _Bool ?>? ( Duration lhs, zero_t ) { return lhs.tv >  0; }
        _Bool ?>=?( Duration lhs, zero_t ) { return lhs.tv >= 0; }

        Duration abs( Duration rhs ) { return rhs.tv >= 0 ? rhs : -rhs; }

        Duration ?`ns( int64_t nsec ) { return (Duration)@{ nsec }; }
        Duration ?`us( int64_t usec ) { return (Duration)@{ usec * (TIMEGRAN / 1_000_000LL) }; }
        Duration ?`ms( int64_t msec ) { return (Duration)@{ msec * (TIMEGRAN / 1_000LL) }; }
        Duration ?`s( int64_t sec ) { return (Duration)@{ sec * TIMEGRAN }; }
        Duration ?`s( double sec ) { return (Duration)@{ sec * TIMEGRAN }; }
        Duration ?`m( int64_t min ) { return (Duration)@{ min * (60LL * TIMEGRAN) }; }
        Duration ?`m( double min ) { return (Duration)@{ min * (60LL * TIMEGRAN) }; }
        Duration ?`h( int64_t hours ) { return (Duration)@{ hours * (60LL * 60LL * TIMEGRAN) }; }
        Duration ?`h( double hours ) { return (Duration)@{ hours * (60LL * 60LL * TIMEGRAN) }; }
        Duration ?`d( int64_t days ) { return (Duration)@{ days * (24LL * 60LL * 60LL * TIMEGRAN) }; }
        Duration ?`d( double days ) { return (Duration)@{ days * (24LL * 60LL * 60LL * TIMEGRAN) }; }
        Duration ?`w( int64_t weeks ) { return (Duration)@{ weeks * (7LL * 24LL * 60LL * 60LL * TIMEGRAN) }; }
        Duration ?`w( double weeks ) { return (Duration)@{ weeks * (7LL * 24LL * 60LL * 60LL * TIMEGRAN) }; }

        int64_t ?`ns( Duration dur ) { return dur.tv; }
        int64_t ?`us( Duration dur ) { return dur.tv / (TIMEGRAN / 1_000_000LL); }
        int64_t ?`ms( Duration dur ) { return dur.tv / (TIMEGRAN / 1_000LL); }
        int64_t ?`s( Duration dur ) { return dur.tv / TIMEGRAN; }
        int64_t ?`m( Duration dur ) { return dur.tv / (60LL * TIMEGRAN); }
        int64_t ?`h( Duration dur ) { return dur.tv / (60LL * 60LL * TIMEGRAN); }
        int64_t ?`d( Duration dur ) { return dur.tv / (24LL * 60LL * 60LL * TIMEGRAN); }
        int64_t ?`w( Duration dur ) { return dur.tv / (7LL * 24LL * 60LL * 60LL * TIMEGRAN); }

        Duration max( Duration lhs, Duration rhs ) { return  (lhs.tv < rhs.tv) ? rhs : lhs;}
        Duration min( Duration lhs, Duration rhs ) { return !(rhs.tv < lhs.tv) ? lhs : rhs;}
} // distribution

//######################### C timeval #########################

static inline {
        void ?{}( timeval & t ) {}
        void ?{}( timeval & t, time_t sec, suseconds_t usec ) { t.tv_sec = sec; t.tv_usec = usec; }
        void ?{}( timeval & t, time_t sec ) { t{ sec, 0 }; }
        void ?{}( timeval & t, zero_t ) { t{ 0, 0 }; }

        timeval ?=?( timeval & t, zero_t ) { return t{ 0 }; }
        timeval ?+?( timeval & lhs, timeval rhs ) { return (timeval)@{ lhs.tv_sec + rhs.tv_sec, lhs.tv_usec + rhs.tv_usec }; }
        timeval ?-?( timeval & lhs, timeval rhs ) { return (timeval)@{ lhs.tv_sec - rhs.tv_sec, lhs.tv_usec - rhs.tv_usec }; }
        _Bool ?==?( timeval lhs, timeval rhs ) { return lhs.tv_sec == rhs.tv_sec && lhs.tv_usec == rhs.tv_usec; }
        _Bool ?!=?( timeval lhs, timeval rhs ) { return lhs.tv_sec != rhs.tv_sec || lhs.tv_usec != rhs.tv_usec; }
} // distribution

//######################### C timespec #########################

static inline {
        void ?{}( timespec & t ) {}
        void ?{}( timespec & t, time_t sec, __syscall_slong_t nsec ) { t.tv_sec = sec; t.tv_nsec = nsec; }
        void ?{}( timespec & t, time_t sec ) { t{ sec, 0}; }
        void ?{}( timespec & t, zero_t ) { t{ 0, 0 }; }

        timespec ?=?( timespec & t, zero_t ) { return t{ 0 }; }
        timespec ?+?( timespec & lhs, timespec rhs ) { return (timespec)@{ lhs.tv_sec + rhs.tv_sec, lhs.tv_nsec + rhs.tv_nsec }; }
        timespec ?-?( timespec & lhs, timespec rhs ) { return (timespec)@{ lhs.tv_sec - rhs.tv_sec, lhs.tv_nsec - rhs.tv_nsec }; }
        _Bool ?==?( timespec lhs, timespec rhs ) { return lhs.tv_sec == rhs.tv_sec && lhs.tv_nsec == rhs.tv_nsec; }
        _Bool ?!=?( timespec lhs, timespec rhs ) { return lhs.tv_sec != rhs.tv_sec || lhs.tv_nsec != rhs.tv_nsec; }
} // distribution

//######################### C itimerval #########################

static inline {
        void ?{}( itimerval & itv, Duration alarm ) with( itv ) {
                // itimerval contains durations but but uses time data-structure timeval.
                it_value{ alarm`s, (alarm % 1`s)`us };                  // seconds, microseconds
                it_interval{ 0 };                                                               // 0 seconds, 0 microseconds
        } // itimerval

        void ?{}( itimerval & itv, Duration alarm, Duration interval ) with( itv ) {
                // itimerval contains durations but but uses time data-structure timeval.
                it_value{ alarm`s, (alarm % 1`s)`us };                  // seconds, microseconds
                it_interval{ interval`s, interval`us };                 // seconds, microseconds
        } // itimerval
} // distribution

//######################### Time #########################

void ?{}( Time & time, int year, int month = 0, int day = 0, int hour = 0, int min = 0, int sec = 0, int nsec = 0 );
static inline {
        Time ?=?( Time & time, zero_t ) { return time{ 0 }; }

        void ?{}( Time & time, timeval t ) with( time ) { tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_usec * 1000; }
        Time ?=?( Time & time, timeval t ) with( time ) {
                tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_usec * (TIMEGRAN / 1_000_000LL);
                return time;
        } // ?=?

        void ?{}( Time & time, timespec t ) with( time ) { tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_nsec; }
        Time ?=?( Time & time, timespec t ) with( time ) {
                tv = (int64_t)t.tv_sec * TIMEGRAN + t.tv_nsec;
                return time;
        } // ?=?

        Time ?+?( Time & lhs, Duration rhs ) { return (Time)@{ lhs.tv + rhs.tv }; }
        Time ?+?( Duration lhs, Time rhs ) { return rhs + lhs; }
        Time ?+=?( Time & lhs, Duration rhs ) { lhs = lhs + rhs; return lhs; }

        Duration ?-?( Time lhs, Time rhs ) { return (Duration)@{ lhs.tv - rhs.tv }; }
        Time ?-?( Time lhs, Duration rhs ) { return (Time)@{ lhs.tv - rhs.tv }; }
        Time ?-=?( Time & lhs, Duration rhs ) { lhs = lhs - rhs; return lhs; }
        _Bool ?==?( Time lhs, Time rhs ) { return lhs.tv == rhs.tv; }
        _Bool ?!=?( Time lhs, Time rhs ) { return lhs.tv != rhs.tv; }
        _Bool ?<?( Time lhs, Time rhs ) { return lhs.tv < rhs.tv; }
        _Bool ?<=?( Time lhs, Time rhs ) { return lhs.tv <= rhs.tv; }
        _Bool ?>?( Time lhs, Time rhs ) { return lhs.tv > rhs.tv; }
        _Bool ?>=?( Time lhs, Time rhs ) { return lhs.tv >= rhs.tv; }
} // distribution

char * yy_mm_dd( Time time, char * buf );
static inline char * ?`ymd( Time time, char * buf ) {   // short form
        return yy_mm_dd( time, buf );
} // ymd

char * mm_dd_yy( Time time, char * buf );
static inline char * ?`mdy( Time time, char * buf ) {   // short form
        return mm_dd_yy( time, buf );
} // mdy

char * dd_mm_yy( Time time, char * buf );
static inline char * ?`dmy( Time time, char * buf ) {   // short form
        return dd_mm_yy( time, buf );;
} // dmy

size_t strftime( char * buf, size_t size, const char * fmt, Time time );

//------------------------- timeval (cont) -------------------------

static inline void ?{}( timeval & t, Time time ) with( t, time ) {
        tv_sec = tv / TIMEGRAN;                                                         // seconds
        tv_usec = tv % TIMEGRAN / (TIMEGRAN / 1_000_000LL);     // microseconds
} // ?{}

//------------------------- timespec (cont) -------------------------

static inline void ?{}( timespec & t, Time time ) with( t, time ) {
        tv_sec = tv / TIMEGRAN;                                                         // seconds
        tv_nsec = tv % TIMEGRAN;                                                        // nanoseconds
} // ?{}

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