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277 lines
8.4 KiB
277 lines
8.4 KiB
/***
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*mktime64.c - Convert struct tm value to __time64_t value.
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*
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* Copyright (c) 1998-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Defines _mktime64() and _mkgmtime64(), routines to converts a time
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* value in a tm structure (possibly incomplete) into a __time64_t value,
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* then update (all) the structure fields with "normalized" values.
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*
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*Revision History:
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* 05-07-98 GJF Created, adapted from Win64 version of mktime.c
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* 05-17-99 PML Remove all Macintosh support.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stddef.h>
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#include <ctime.h>
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#include <time.h>
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#include <internal.h>
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/*
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* Core function for both _mktime64() and _mkgmtime64()
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*/
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static __time64_t __cdecl _make__time64_t( struct tm *, int);
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/***
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*__time64_t _mktime64(tb) - Normalize user time block structure
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*
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*Purpose:
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* _mktime64 converts a time structure, passed in as an argument, into a
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* 64-bit calendar time value in internal format (__time64_t). It also
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* completes and updates the fields the of the passed in structure with
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* 'normalized' values. There are three practical uses for this routine:
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*
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* (1) Convert broken-down time to internal time format (__time64_t).
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* (2) To have _mktime64 fill in the tm_wday, tm_yday, or tm_isdst fields.
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* (3) To pass in a time structure with 'out of range' values for some
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* fields and have _mktime64 "normalize" them (e.g., pass in 1/35/87 and
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* get back 2/4/87).
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*Entry:
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* struct tm *tb - pointer to a tm time structure to convert and
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* normalize
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*
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*Exit:
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* If successful, _mktime64 returns the specified calender time encoded as
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* a __time64_t value. Otherwise, (__time64_t)(-1) is returned to indicate an
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* error.
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*
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*Exceptions:
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* None.
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*
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*******************************************************************************/
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__time64_t __cdecl _mktime64 (
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struct tm *tb
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)
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{
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return( _make__time64_t(tb, 1) );
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}
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/***
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*__time64_t _mkgmtime64(tb) - Convert broken down UTC time to __time64_t
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*
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*Purpose:
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* Convert a tm structure, passed in as an argument, containing a UTC
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* time value to 64-bit internal format (__time64_t). It also completes
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* and updates the fields the of the passed in structure with 'normalized'
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* values.
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*
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*Entry:
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* struct tm *tb - pointer to a tm time structure to convert and
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* normalize
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*
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*Exit:
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* If successful, _mkgmtime64 returns the calender time encoded as a
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* __time64_t value.
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* Otherwise, (__time64_t)(-1) is returned to indicate an error.
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*
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*Exceptions:
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* None.
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*
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*******************************************************************************/
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__time64_t __cdecl _mkgmtime64 (
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struct tm *tb
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)
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{
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return( _make__time64_t(tb, 0) );
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}
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/***
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*static __time64_t make_time_t(tb, ultflag) -
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*
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*Purpose:
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* Converts a struct tm value to a __time64_t value, then updates the
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* struct tm value. Either local time or UTC is supported, based on
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* ultflag. This is the routine that actually does the work for both
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* _mktime64() and _mkgmtime64().
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*
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*Entry:
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* struct tm *tb - pointer to a tm time structure to convert and
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* normalize
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* int ultflag - use local time flag. the tb structure is assumed
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* to represent a local date/time if ultflag > 0.
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* otherwise, UTC is assumed.
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*
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*Exit:
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* If successful, _mktime64 returns the specified calender time encoded
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* as a __time64_t value. Otherwise, (__time64_t)(-1) is returned to
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* indicate an error.
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*
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*Exceptions:
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* None.
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*
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*******************************************************************************/
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static __time64_t __cdecl _make__time64_t (
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struct tm *tb,
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int ultflag
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)
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{
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__time64_t tmptm1, tmptm2, tmptm3;
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struct tm *tbtemp;
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/*
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* First, make sure tm_year is reasonably close to being in range.
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*/
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if ( ((tmptm1 = tb->tm_year) < _BASE_YEAR - 1) || (tmptm1 > _MAX_YEAR64
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+ 1) )
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goto err_mktime;
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/*
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* Adjust month value so it is in the range 0 - 11. This is because
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* we don't know how many days are in months 12, 13, 14, etc.
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*/
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if ( (tb->tm_mon < 0) || (tb->tm_mon > 11) ) {
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tmptm1 += (tb->tm_mon / 12);
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if ( (tb->tm_mon %= 12) < 0 ) {
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tb->tm_mon += 12;
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tmptm1--;
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}
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/*
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* Make sure year count is still in range.
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*/
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if ( (tmptm1 < _BASE_YEAR - 1) || (tmptm1 > _MAX_YEAR64 + 1) )
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goto err_mktime;
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}
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/***** HERE: tmptm1 holds number of elapsed years *****/
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/*
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* Calculate days elapsed minus one, in the given year, to the given
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* month. Check for leap year and adjust if necessary.
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*/
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tmptm2 = _days[tb->tm_mon];
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if ( _IS_LEAP_YEAR(tmptm1) && (tb->tm_mon > 1) )
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tmptm2++;
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/*
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* Calculate elapsed days since base date (midnight, 1/1/70, UTC)
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*
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*
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* 365 days for each elapsed year since 1970, plus one more day for
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* each elapsed leap year. no danger of overflow because of the range
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* check (above) on tmptm1.
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*/
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tmptm3 = (tmptm1 - _BASE_YEAR) * 365 + _ELAPSED_LEAP_YEARS(tmptm1);
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/*
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* elapsed days to current month (still no possible overflow)
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*/
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tmptm3 += tmptm2;
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/*
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* elapsed days to current date.
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*/
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tmptm1 = tmptm3 + (tmptm2 = (__time64_t)(tb->tm_mday));
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/***** HERE: tmptm1 holds number of elapsed days *****/
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/*
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* Calculate elapsed hours since base date
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*/
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tmptm2 = tmptm1 * 24;
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tmptm1 = tmptm2 + (tmptm3 = (__time64_t)tb->tm_hour);
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/***** HERE: tmptm1 holds number of elapsed hours *****/
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/*
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* Calculate elapsed minutes since base date
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*/
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tmptm2 = tmptm1 * 60;
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tmptm1 = tmptm2 + (tmptm3 = (__time64_t)tb->tm_min);
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/***** HERE: tmptm1 holds number of elapsed minutes *****/
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/*
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* Calculate elapsed seconds since base date
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*/
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tmptm2 = tmptm1 * 60;
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tmptm1 = tmptm2 + (tmptm3 = (__time64_t)tb->tm_sec);
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/***** HERE: tmptm1 holds number of elapsed seconds *****/
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if ( ultflag ) {
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/*
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* Adjust for timezone. No need to check for overflow since
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* localtime() will check its arg value
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*/
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#ifdef _POSIX_
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tzset();
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#else
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__tzset();
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#endif
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tmptm1 += _timezone;
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/*
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* Convert this second count back into a time block structure.
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* If localtime returns NULL, return an error.
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*/
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if ( (tbtemp = _localtime64(&tmptm1)) == NULL )
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goto err_mktime;
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/*
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* Now must compensate for DST. The ANSI rules are to use the
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* passed-in tm_isdst flag if it is non-negative. Otherwise,
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* compute if DST applies. Recall that tbtemp has the time without
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* DST compensation, but has set tm_isdst correctly.
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*/
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if ( (tb->tm_isdst > 0) || ((tb->tm_isdst < 0) &&
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(tbtemp->tm_isdst > 0)) ) {
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#ifdef _POSIX_
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tmptm1 -= _timezone;
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tmptm1 += _dstoffset;
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#else
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tmptm1 += _dstbias;
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#endif
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tbtemp = _localtime64(&tmptm1); /* reconvert, can't get NULL */
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}
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}
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else {
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if ( (tbtemp = _gmtime64(&tmptm1)) == NULL )
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goto err_mktime;
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}
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/***** HERE: tmptm1 holds number of elapsed seconds, adjusted *****/
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/***** for local time if requested *****/
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*tb = *tbtemp;
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return tmptm1;
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err_mktime:
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/*
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* All errors come to here
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*/
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return (__time64_t)(-1);
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}
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