413 lines
11 KiB
C
413 lines
11 KiB
C
/*
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* msvcrt.dll date/time functions
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*
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* Copyright 1996,1998 Marcus Meissner
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* Copyright 1996 Jukka Iivonen
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* Copyright 1997,2000 Uwe Bonnes
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* Copyright 2000 Jon Griffiths
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* Copyright 2004 Hans Leidekker
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <time.h>
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#ifdef HAVE_SYS_TIMES_H
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# include <sys/times.h>
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#endif
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#include <limits.h>
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#include "msvcrt.h"
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#include "winbase.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
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static const int MonthLengths[2][12] =
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{
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{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
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};
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static inline int IsLeapYear(int Year)
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{
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return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
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}
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#define SECSPERDAY 86400
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/* 1601 to 1970 is 369 years plus 89 leap days */
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#define SECS_1601_TO_1970 ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
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#define TICKSPERSEC 10000000
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#define TICKSPERMSEC 10000
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#define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
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/* native uses a single static buffer for localtime/gmtime/mktime */
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static struct MSVCRT_tm tm;
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/**********************************************************************
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* mktime (MSVCRT.@)
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*/
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MSVCRT_time_t MSVCRT_mktime(struct MSVCRT_tm *t)
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{
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MSVCRT_time_t secs;
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FILETIME lft, uft;
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ULONGLONG time;
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struct MSVCRT_tm ts;
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int cleaps, day;
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ts=*t;
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/* to prevent arithmetic overflows put constraints on some fields */
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/* whether the effective date falls in the 1970-2038 time period */
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/* will be tested later */
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/* BTW, I have no idea what limits native msvcrt has. */
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if ( ts.tm_year < 0 || ts.tm_year > 140 ||
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ts.tm_mon < -840 || ts.tm_mon > 840 ||
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ts.tm_mday < -20160 || ts.tm_mday > 20160 ||
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ts.tm_hour < -484000 || ts.tm_hour > 484000 ||
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ts.tm_min < -29000000 || ts.tm_min > 29000000 )
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return -1;
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/* normalize the tm month fields */
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if( ts.tm_mon > 11) { ts.tm_year += ts.tm_mon / 12; ts.tm_mon %= 12; }
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if( ts.tm_mon < 0) {
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int dy = (11 - ts.tm_mon) / 12;
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ts.tm_year -= dy;
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ts.tm_mon += dy * 12;
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}
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/* now calculate a day count from the date
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* First start counting years from March. This way the leap days
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* are added at the end of the year, not somewhere in the middle.
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* Formula's become so much less complicate that way.
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* To convert: add 12 to the month numbers of Jan and Feb, and
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* take 1 from the year */
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if(ts.tm_mon < 2) {
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ts.tm_mon += 14;
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ts.tm_year += 1899;
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} else {
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ts.tm_mon += 2;
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ts.tm_year += 1900;
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}
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cleaps = (3 * (ts.tm_year / 100) + 3) / 4; /* nr of "century leap years"*/
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day = (36525 * ts.tm_year) / 100 - cleaps + /* year * dayperyr, corrected*/
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(1959 * ts.tm_mon) / 64 + /* months * daypermonth */
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ts.tm_mday - /* day of the month */
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584817 ; /* zero that on 1601-01-01 */
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/* done */
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/* convert to 100 ns ticks */
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time = ((((ULONGLONG) day * 24 +
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ts.tm_hour) * 60 +
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ts.tm_min) * 60 +
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ts.tm_sec ) * TICKSPERSEC;
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lft.dwHighDateTime = (DWORD) (time >> 32);
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lft.dwLowDateTime = (DWORD) time;
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LocalFileTimeToFileTime(&lft, &uft);
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time = ((ULONGLONG)uft.dwHighDateTime << 32) | uft.dwLowDateTime;
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time /= TICKSPERSEC;
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if( time < SECS_1601_TO_1970 || time > (SECS_1601_TO_1970 + INT_MAX))
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return -1;
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secs = time - SECS_1601_TO_1970;
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/* compute tm_wday, tm_yday and renormalize the other fields of the
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* tm structure */
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if( MSVCRT_localtime( &secs)) *t = tm;
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return secs;
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}
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/*********************************************************************
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* localtime (MSVCRT.@)
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*/
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struct MSVCRT_tm* MSVCRT_localtime(const MSVCRT_time_t* secs)
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{
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int i;
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FILETIME ft, lft;
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SYSTEMTIME st;
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DWORD tzid;
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TIME_ZONE_INFORMATION tzinfo;
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ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
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ft.dwHighDateTime = (UINT)(time >> 32);
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ft.dwLowDateTime = (UINT)time;
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FileTimeToLocalFileTime(&ft, &lft);
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FileTimeToSystemTime(&lft, &st);
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if (st.wYear < 1970) return NULL;
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tm.tm_sec = st.wSecond;
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tm.tm_min = st.wMinute;
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tm.tm_hour = st.wHour;
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tm.tm_mday = st.wDay;
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tm.tm_year = st.wYear - 1900;
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tm.tm_mon = st.wMonth - 1;
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tm.tm_wday = st.wDayOfWeek;
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for (i = tm.tm_yday = 0; i < st.wMonth - 1; i++) {
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tm.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
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}
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tm.tm_yday += st.wDay - 1;
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tzid = GetTimeZoneInformation(&tzinfo);
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if (tzid == TIME_ZONE_ID_INVALID)
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tm.tm_isdst = -1;
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else
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tm.tm_isdst = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
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return &tm;
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}
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struct MSVCRT_tm* MSVCRT_gmtime(const MSVCRT_time_t* secs)
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{
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int i;
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FILETIME ft;
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SYSTEMTIME st;
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ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
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ft.dwHighDateTime = (UINT)(time >> 32);
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ft.dwLowDateTime = (UINT)time;
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FileTimeToSystemTime(&ft, &st);
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if (st.wYear < 1970) return NULL;
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tm.tm_sec = st.wSecond;
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tm.tm_min = st.wMinute;
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tm.tm_hour = st.wHour;
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tm.tm_mday = st.wDay;
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tm.tm_year = st.wYear - 1900;
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tm.tm_mon = st.wMonth - 1;
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tm.tm_wday = st.wDayOfWeek;
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for (i = tm.tm_yday = 0; i < st.wMonth - 1; i++) {
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tm.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
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}
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tm.tm_yday += st.wDay - 1;
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tm.tm_isdst = 0;
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return &tm;
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}
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/**********************************************************************
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* _strdate (MSVCRT.@)
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*/
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char* _strdate(char* date)
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{
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LPCSTR format = "MM'/'dd'/'yy";
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GetDateFormatA(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
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return date;
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}
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/**********************************************************************
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* _wstrdate (MSVCRT.@)
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*/
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MSVCRT_wchar_t* _wstrdate(MSVCRT_wchar_t* date)
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{
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static const WCHAR format[] = { 'M','M','\'','/','\'','d','d','\'','/','\'','y','y',0 };
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GetDateFormatW(LOCALE_NEUTRAL, 0, NULL, format, (LPWSTR)date, 9);
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return date;
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}
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/*********************************************************************
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* _strtime (MSVCRT.@)
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*/
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char* _strtime(char* time)
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{
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LPCSTR format = "HH':'mm':'ss";
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GetTimeFormatA(LOCALE_NEUTRAL, 0, NULL, format, time, 9);
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return time;
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}
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/*********************************************************************
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* _wstrtime (MSVCRT.@)
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*/
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MSVCRT_wchar_t* _wstrtime(MSVCRT_wchar_t* time)
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{
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static const WCHAR format[] = { 'H','H','\'',':','\'','m','m','\'',':','\'','s','s',0 };
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GetTimeFormatW(LOCALE_NEUTRAL, 0, NULL, format, (LPWSTR)time, 9);
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return time;
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}
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/*********************************************************************
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* clock (MSVCRT.@)
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*/
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MSVCRT_clock_t MSVCRT_clock(void)
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{
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FILETIME ftc, fte, ftk, ftu;
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ULONGLONG utime, ktime;
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MSVCRT_clock_t clock;
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GetProcessTimes(GetCurrentProcess(), &ftc, &fte, &ftk, &ftu);
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ktime = ((ULONGLONG)ftk.dwHighDateTime << 32) | ftk.dwLowDateTime;
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utime = ((ULONGLONG)ftu.dwHighDateTime << 32) | ftu.dwLowDateTime;
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clock = (utime + ktime) / (TICKSPERSEC / MSVCRT_CLOCKS_PER_SEC);
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return clock;
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}
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/*********************************************************************
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* difftime (MSVCRT.@)
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*/
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double MSVCRT_difftime(MSVCRT_time_t time1, MSVCRT_time_t time2)
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{
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return (double)(time1 - time2);
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}
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/*********************************************************************
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* _ftime (MSVCRT.@)
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*/
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void _ftime(struct MSVCRT__timeb *buf)
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{
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TIME_ZONE_INFORMATION tzinfo;
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FILETIME ft;
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ULONGLONG time;
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DWORD tzid = GetTimeZoneInformation(&tzinfo);
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GetSystemTimeAsFileTime(&ft);
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time = ((ULONGLONG)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
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buf->time = time / TICKSPERSEC - SECS_1601_TO_1970;
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buf->millitm = (time % TICKSPERSEC) / TICKSPERMSEC;
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buf->timezone = tzinfo.Bias +
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( tzid == TIME_ZONE_ID_STANDARD ? tzinfo.StandardBias :
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( tzid == TIME_ZONE_ID_DAYLIGHT ? tzinfo.DaylightBias : 0 ));
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buf->dstflag = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
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}
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/*********************************************************************
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* time (MSVCRT.@)
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*/
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MSVCRT_time_t MSVCRT_time(MSVCRT_time_t* buf)
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{
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MSVCRT_time_t curtime;
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struct MSVCRT__timeb tb;
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_ftime(&tb);
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curtime = tb.time;
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return buf ? *buf = curtime : curtime;
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}
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/*********************************************************************
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* _daylight (MSVCRT.@)
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*/
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int MSVCRT___daylight = 0;
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/*********************************************************************
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* __p_daylight (MSVCRT.@)
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*/
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int *MSVCRT___p__daylight(void)
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{
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return &MSVCRT___daylight;
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}
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/*********************************************************************
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* _dstbias (MSVCRT.@)
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*/
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int MSVCRT__dstbias = 0;
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/*********************************************************************
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* __p_dstbias (MSVCRT.@)
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*/
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int *__p__dstbias(void)
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{
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return &MSVCRT__dstbias;
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}
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/*********************************************************************
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* _timezone (MSVCRT.@)
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*/
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long MSVCRT___timezone = 0;
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/*********************************************************************
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* __p_timezone (MSVCRT.@)
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*/
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long *MSVCRT___p__timezone(void)
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{
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return &MSVCRT___timezone;
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}
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/*********************************************************************
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* _tzname (MSVCRT.@)
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* NOTES
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* Some apps (notably Mozilla) insist on writing to these, so the buffer
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* must be large enough. The size is picked based on observation of
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* Windows XP.
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*/
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static char tzname_std[64] = "";
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static char tzname_dst[64] = "";
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char *MSVCRT__tzname[2] = { tzname_std, tzname_dst };
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/*********************************************************************
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* __p_tzname (MSVCRT.@)
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*/
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char **__p__tzname(void)
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{
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return MSVCRT__tzname;
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}
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/*********************************************************************
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* _tzset (MSVCRT.@)
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*/
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void MSVCRT__tzset(void)
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{
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tzset();
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#if defined(HAVE_TIMEZONE) && defined(HAVE_DAYLIGHT)
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MSVCRT___daylight = daylight;
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MSVCRT___timezone = timezone;
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#else
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{
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static const time_t seconds_in_year = (365 * 24 + 6) * 3600;
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time_t t;
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struct tm *tmp;
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long zone_january, zone_july;
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t = (time((time_t *)0) / seconds_in_year) * seconds_in_year;
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tmp = localtime(&t);
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zone_january = -tmp->tm_gmtoff;
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t += seconds_in_year / 2;
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tmp = localtime(&t);
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zone_july = -tmp->tm_gmtoff;
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MSVCRT___daylight = (zone_january != zone_july);
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MSVCRT___timezone = max(zone_january, zone_july);
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}
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#endif
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lstrcpynA(tzname_std, tzname[0], sizeof(tzname_std));
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tzname_std[sizeof(tzname_std) - 1] = '\0';
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lstrcpynA(tzname_dst, tzname[1], sizeof(tzname_dst));
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tzname_dst[sizeof(tzname_dst) - 1] = '\0';
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}
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