source: src/libcfa/time.c@ f3152ab

// 
// 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.c -- 
// 
// Author           : Peter A. Buhr
// Created On       : Tue Mar 27 13:33:14 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Apr 12 14:41:00 2018
// Update Count     : 22
// 

#include "time"
#include "iostream"
#include <stdio.h>                                                                              // snprintf

static char * nanomsd( long int ns, char * buf ) {              // most significant digits
        snprintf( buf, 16, ".%09ld", ns );
        int i;
        for ( i = 9; buf[i] == '0' ; i -= 1 );                          // find least significant digit
        buf[i + 1] = '\0';
        return buf;
} // nanomsd


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


forall( dtype ostype | ostream( ostype ) )
ostype & ?|?( ostype & os, Duration dur ) with( dur ) {
        os | tv / TIMEGRAN;                                                                     // print seconds
        long int ns = (tv < 0 ? -tv : tv) % TIMEGRAN;           // compute nanoseconds
        if ( ns != 0 ) {                                                                        // some ?
                char buf[16];
                os | nanomsd( ns, buf );                                                // print nanoseconds
        } // if
        return os;
} // ?|?


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


#ifdef __CFA_DEBUG__
#define CreateFmt "Attempt to create Time( year=%d (>=1970), month=%d (1-12), day=%d (1-31), hour=%d (0-23), min=%d (0-59), sec=%d (0-60), nsec=%d (0-999_999_999), " \
        "which exceeds range 00:00:00 UTC, January 1, 1970 to 03:14:07 UTC, January 19, 2038."
#endif // __CFA_DEBUG__

void ?{}( Time & time, int year, int month, int day, int hour, int min, int sec, int nsec ) with( time ) {
        tm tm;

        tm.tm_isdst = -1;                                                                       // let mktime determine if alternate timezone is in effect
        tm.tm_year = year - 1900;                                                       // mktime uses 1900 as its starting point
#ifdef __CFA_DEBUG__
        if ( month < 1 || 12 < month ) {
                abort( CreateFmt, year, month, day, hour, (int)min, sec, nsec );
        } // if
#endif // __CFA_DEBUG__
        tm.tm_mon = month - 1;                                                          // mktime uses range 0-11
#ifdef __CFA_DEBUG__
        if ( day < 1 || 31 < day ) {
                abort( CreateFmt, year, month, day, hour, (int)min, sec, nsec );
        } // if
#endif // __CFA_DEBUG__
        tm.tm_mday = day;                                                                       // mktime uses range 1-31
        tm.tm_hour = hour;
        tm.tm_min = min;
        tm.tm_sec = sec;
        time_t epochsec = mktime( &tm );
#ifdef __CFA_DEBUG__
        if ( epochsec == (time_t)-1 ) {
                abort( CreateFmt, year, month, day, hour, (int)min, sec, nsec );
        } // if
#endif // __CFA_DEBUG__
        tv = (int64_t)(epochsec) * TIMEGRAN + nsec;                     // convert to nanoseconds
#ifdef __CFA_DEBUG__
        if ( tv > 2147483647LL * TIMEGRAN ) {                           // between 00:00:00 UTC, January 1, 1970 and 03:14:07 UTC, January 19, 2038.
                abort( CreateFmt, year, month, day, hour, (int)min, sec, nsec );
        } // if
#endif // __CFA_DEBUG__
} // ?{}

char * yy_mm_dd( Time time, char * buf ) with( time ) {
        time_t s = tv / TIMEGRAN;
        tm tm;
        gmtime_r( &s, &tm );
        snprintf( buf, 9, "%02d/%02d/%02d", tm.tm_year % 99, tm.tm_mon + 1, tm.tm_mday );
        return buf;
} // yy_mm_dd

char * mm_dd_yy( Time time, char * buf ) with( time ) {
        time_t s = tv / TIMEGRAN;
        tm tm;
        gmtime_r( &s, &tm );
        snprintf( buf, 9, "%02d/%02d/%02d", tm.tm_mon + 1, tm.tm_mday, tm.tm_year % 99 );
        return buf;
} // mm_dd_yy

char * dd_mm_yy( Time time, char * buf ) with( time ) {
        time_t s = tv / TIMEGRAN;
        tm tm;
        gmtime_r( &s, &tm );
        snprintf( buf, 9, "%02d/%02d/%02d", tm.tm_mday, tm.tm_mon + 1, tm.tm_year % 99 );
        return buf;
} // dd_mm_yy

size_t strftime( char * buf, size_t size, const char * fmt, Time time ) with( time ) {
        time_t s = tv / TIMEGRAN;
        tm tm;
        gmtime_r( &s, &tm );
        return strftime( buf, size, fmt, &tm );
} // strftime

forall( dtype ostype | ostream( ostype ) )
ostype & ?|?( ostype & os, Time time ) with( time ) {
        char buf[32];                                                                           // at least 26
        time_t s = tv / TIMEGRAN;
    ctime_r( &s, (char *)&buf );                                                // 26 characters: "Wed Jun 30 21:49:08 1993\n"
        buf[24] = '\0';                                                                         // remove trailing '\n'
        long int ns = (tv < 0 ? -tv : tv) % TIMEGRAN;           // compute nanoseconds
        if ( ns == 0 ) {                                                                        // none ?
                os | buf;                                                                               // print date/time/year
        } else {
                buf[19] = '\0';                                                                 // truncate to "Wed Jun 30 21:49:08"
                os | buf;                                                                               // print date/time
                char buf2[16];
                nanomsd( ns, buf2 );                                                    // compute nanoseconds
                os | buf2 | ' ' | &buf[20];                                             // print nanoseconds and year
        } // if
        return os;
} // ?|?

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