dlls/msvcrt/time.c

   1 /*
   2  * msvcrt.dll date/time functions
   3  *
   4  * Copyright 1996,1998 Marcus Meissner
   5  * Copyright 1996 Jukka Iivonen
   6  * Copyright 1997,2000 Uwe Bonnes
   7  * Copyright 2000 Jon Griffiths
   8  * Copyright 2004 Hans Leidekker
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26
  27 #include <time.h>
  28 #ifdef HAVE_SYS_TIMES_H
  29 # include <sys/times.h>
  30 #endif
  31
  32 #include "msvcrt.h"
  33 #include "winbase.h"
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  37
  38 static const int MonthLengths[2][12] =
  39 {
  40     { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  41     { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  42 };
  43
  44 static inline int IsLeapYear(int Year)
  45 {
  46     return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
  47 }
  48
  49 #define SECSPERDAY        86400
  50 /* 1601 to 1970 is 369 years plus 89 leap days */
  51 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  52 #define TICKSPERSEC       10000000
  53 #define TICKSPERMSEC      10000
  54 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  55
  56 /* native uses a single static buffer for localtime/gmtime/mktime */
  57 static struct MSVCRT_tm tm;
  58
  59 /**********************************************************************
  60  *              mktime (MSVCRT.@)
  61  */
  62 MSVCRT_time_t MSVCRT_mktime(struct MSVCRT_tm *t)
  63 {
  64   MSVCRT_time_t secs;
  65   SYSTEMTIME st;
  66   FILETIME lft, uft;
  67   ULONGLONG time;
  68
  69   st.wMilliseconds = 0;
  70   st.wSecond = t->tm_sec;
  71   st.wMinute = t->tm_min;
  72   st.wHour   = t->tm_hour;
  73   st.wDay    = t->tm_mday;
  74   st.wMonth  = t->tm_mon + 1;
  75   st.wYear   = t->tm_year + 1900;
  76
  77   SystemTimeToFileTime(&st, &lft);
  78   LocalFileTimeToFileTime(&lft, &uft);
  79
  80   time = ((ULONGLONG)uft.dwHighDateTime << 32) | uft.dwLowDateTime;
  81   secs = time / TICKSPERSEC - SECS_1601_TO_1970;
  82   /* compute tm_wday, tm_yday and renormalize the other fields of the
  83    * tm structure */
  84   if( MSVCRT_localtime( &secs)) *t = tm;
  85
  86   return secs;
  87 }
  88
  89 /*********************************************************************
  90  *      localtime (MSVCRT.@)
  91  */
  92 struct MSVCRT_tm* MSVCRT_localtime(const MSVCRT_time_t* secs)
  93 {
  94   int i;
  95
  96   FILETIME ft, lft;
  97   SYSTEMTIME st;
  98   DWORD tzid;
  99   TIME_ZONE_INFORMATION tzinfo;
 100
 101   ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 102
 103   ft.dwHighDateTime = (UINT)(time >> 32);
 104   ft.dwLowDateTime  = (UINT)time;
 105
 106   FileTimeToLocalFileTime(&ft, &lft);
 107   FileTimeToSystemTime(&lft, &st);
 108
 109   if (st.wYear < 1970) return NULL;
 110
 111   tm.tm_sec  = st.wSecond;
 112   tm.tm_min  = st.wMinute;
 113   tm.tm_hour = st.wHour;
 114   tm.tm_mday = st.wDay;
 115   tm.tm_year = st.wYear - 1900;
 116   tm.tm_mon  = st.wMonth  - 1;
 117   tm.tm_wday = st.wDayOfWeek;
 118
 119   for (i = tm.tm_yday = 0; i < st.wMonth - 1; i++) {
 120     tm.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 121   }
 122
 123   tm.tm_yday += st.wDay - 1;
 124
 125   tzid = GetTimeZoneInformation(&tzinfo);
 126
 127   if (tzid == TIME_ZONE_ID_UNKNOWN || tzid == TIME_ZONE_ID_INVALID) {
 128     tm.tm_isdst = -1;
 129   } else {
 130     tm.tm_isdst = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 131   }
 132
 133   return &tm;
 134 }
 135
 136 struct MSVCRT_tm* MSVCRT_gmtime(const MSVCRT_time_t* secs)
 137 {
 138   int i;
 139
 140   FILETIME ft;
 141   SYSTEMTIME st;
 142
 143   ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 144
 145   ft.dwHighDateTime = (UINT)(time >> 32);
 146   ft.dwLowDateTime  = (UINT)time;
 147
 148   FileTimeToSystemTime(&ft, &st);
 149
 150   if (st.wYear < 1970) return NULL;
 151
 152   tm.tm_sec  = st.wSecond;
 153   tm.tm_min  = st.wMinute;
 154   tm.tm_hour = st.wHour;
 155   tm.tm_mday = st.wDay;
 156   tm.tm_year = st.wYear - 1900;
 157   tm.tm_mon  = st.wMonth - 1;
 158   tm.tm_wday = st.wDayOfWeek;
 159   for (i = tm.tm_yday = 0; i < st.wMonth - 1; i++) {
 160     tm.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 161   }
 162
 163   tm.tm_yday += st.wDay - 1;
 164   tm.tm_isdst = 0;
 165
 166   return &tm;
 167 }
 168
 169 /**********************************************************************
 170  *              _strdate (MSVCRT.@)
 171  */
 172 char* _strdate(char* date)
 173 {
 174   LPCSTR format = "MM'/'dd'/'yy";
 175
 176   GetDateFormatA(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
 177
 178   return date;
 179 }
 180
 181 /*********************************************************************
 182  *              _strtime (MSVCRT.@)
 183  */
 184 char* _strtime(char* date)
 185 {
 186   LPCSTR format = "HH':'mm':'ss";
 187
 188   GetTimeFormatA(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
 189
 190   return date;
 191 }
 192
 193 /*********************************************************************
 194  *              clock (MSVCRT.@)
 195  */
 196 MSVCRT_clock_t MSVCRT_clock(void)
 197 {
 198   FILETIME ftc, fte, ftk, ftu;
 199   ULONGLONG utime, ktime;
 200
 201   MSVCRT_clock_t clock;
 202
 203   GetProcessTimes(GetCurrentProcess(), &ftc, &fte, &ftk, &ftu);
 204
 205   ktime = ((ULONGLONG)ftk.dwHighDateTime << 32) | ftk.dwLowDateTime;
 206   utime = ((ULONGLONG)ftu.dwHighDateTime << 32) | ftu.dwLowDateTime;
 207
 208   clock = (utime + ktime) / (TICKSPERSEC / MSVCRT_CLOCKS_PER_SEC);
 209
 210   return clock;
 211 }
 212
 213 /*********************************************************************
 214  *              difftime (MSVCRT.@)
 215  */
 216 double MSVCRT_difftime(MSVCRT_time_t time1, MSVCRT_time_t time2)
 217 {
 218   return (double)(time1 - time2);
 219 }
 220
 221 /*********************************************************************
 222  *              _ftime (MSVCRT.@)
 223  */
 224 void _ftime(struct MSVCRT__timeb *buf)
 225 {
 226   TIME_ZONE_INFORMATION tzinfo;
 227   FILETIME ft;
 228   ULONGLONG time;
 229
 230   DWORD tzid = GetTimeZoneInformation(&tzinfo);
 231   GetSystemTimeAsFileTime(&ft);
 232
 233   time = ((ULONGLONG)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
 234
 235   buf->time = time / TICKSPERSEC - SECS_1601_TO_1970;
 236   buf->millitm = (time % TICKSPERSEC) / TICKSPERMSEC;
 237   buf->timezone = tzinfo.Bias +
 238       ( tzid == TIME_ZONE_ID_STANDARD ? tzinfo.StandardBias :
 239       ( tzid == TIME_ZONE_ID_DAYLIGHT ? tzinfo.DaylightBias : 0 ));
 240   buf->dstflag = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 241 }
 242
 243 /*********************************************************************
 244  *              time (MSVCRT.@)
 245  */
 246 MSVCRT_time_t MSVCRT_time(MSVCRT_time_t* buf)
 247 {
 248   MSVCRT_time_t curtime;
 249   struct MSVCRT__timeb tb;
 250
 251   _ftime(&tb);
 252
 253   curtime = tb.time;
 254   return buf ? *buf = curtime : curtime;
 255 }
 256
 257 /*********************************************************************
 258  *              _daylight (MSVCRT.@)
 259  */
 260 int MSVCRT___daylight = 1; /* FIXME: assume daylight */
 261
 262 /*********************************************************************
 263  *              __p_daylight (MSVCRT.@)
 264  */
 265 void *MSVCRT___p__daylight(void)
 266 {
 267         return &MSVCRT___daylight;
 268 }