src/msw/wince/time.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/wince/time.cpp
   3 // Purpose:     Implements missing time functionality for WinCE
   4 // Author:      Marco Cavallini (MCK) - wx@koansoftware.com
   5 // Modified by:
   6 // Created:     31-08-2003
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Marco Cavallini
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ===========================================================================
  13 // declarations
  14 // ===========================================================================
  15
  16 // ---------------------------------------------------------------------------
  17 // headers
  18 // ---------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/msw/wrapwin.h"
  29 #endif
  30
  31 #include "wx/msw/wince/time.h"
  32
  33 /////////////////////////////////////////////////////////////////////////////////////////////
  34 //                                                                                         //
  35 //                             strftime() - taken from OpenBSD                             //
  36 //                                                                                         //
  37 /////////////////////////////////////////////////////////////////////////////////////////////
  38
  39 #define IN_NONE 0
  40 #define IN_SOME 1
  41 #define IN_THIS 2
  42 #define IN_ALL  3
  43 #define CHAR_BIT      8
  44
  45 #define TYPE_BIT(type)  (sizeof (type) * CHAR_BIT)
  46 #define TYPE_SIGNED(type) (((type) -1) < 0)
  47
  48 #define INT_STRLEN_MAXIMUM(type) \
  49     ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type))
  50
  51 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
  52
  53 #define MONSPERYEAR     12
  54 #define DAYSPERWEEK     7
  55 #define TM_YEAR_BASE    1900
  56 #define HOURSPERDAY     24
  57 #define DAYSPERNYEAR    365
  58 #define DAYSPERLYEAR    366
  59
  60 static char             wildabbr[] = "WILDABBR";
  61
  62 char *                  tzname[2] = {
  63         wildabbr,
  64         wildabbr
  65 };
  66
  67
  68 #define Locale  (&C_time_locale)
  69
  70 struct lc_time_T {
  71         const char *    mon[MONSPERYEAR];
  72         const char *    month[MONSPERYEAR];
  73         const char *    wday[DAYSPERWEEK];
  74         const char *    weekday[DAYSPERWEEK];
  75         const char *    X_fmt;
  76         const char *    x_fmt;
  77         const char *    c_fmt;
  78         const char *    am;
  79         const char *    pm;
  80         const char *    date_fmt;
  81 };
  82
  83 static const struct lc_time_T   C_time_locale = {
  84         {
  85                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  86                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  87         }, {
  88                 "January", "February", "March", "April", "May", "June",
  89                 "July", "August", "September", "October", "November", "December"
  90         }, {
  91                 "Sun", "Mon", "Tue", "Wed",
  92                 "Thu", "Fri", "Sat"
  93         }, {
  94                 "Sunday", "Monday", "Tuesday", "Wednesday",
  95                 "Thursday", "Friday", "Saturday"
  96         },
  97
  98         /* X_fmt */
  99         "%H:%M:%S",
 100
 101         /*
 102         ** x_fmt
 103         ** C99 requires this format.
 104         ** Using just numbers (as here) makes Quakers happier;
 105         ** it's also compatible with SVR4.
 106         */
 107         "%m/%d/%y",
 108
 109         /*
 110         ** c_fmt
 111         ** C99 requires this format.
 112         ** Previously this code used "%D %X", but we now conform to C99.
 113         ** Note that
 114         **      "%a %b %d %H:%M:%S %Y"
 115         ** is used by Solaris 2.3.
 116         */
 117         "%a %b %e %T %Y",
 118
 119         /* am */
 120         "AM",
 121
 122         /* pm */
 123         "PM",
 124
 125         /* date_fmt */
 126         "%a %b %e %H:%M:%S %Z %Y"
 127 };
 128
 129
 130 static char *
 131 _add(const char * str, char * pt, const char * const ptlim)
 132 {
 133         while (pt < ptlim && (*pt = *str++) != '\0')
 134                 ++pt;
 135         return pt;
 136 }
 137
 138
 139 static char *
 140 _conv(const int n, const char * const format, char * const pt, const char * const ptlim)
 141 {
 142         char    buf[INT_STRLEN_MAXIMUM(int) + 1];
 143
 144         (void) _snprintf(buf, sizeof buf, format, n);
 145         return _add(buf, pt, ptlim);
 146 }
 147
 148
 149 static char *
 150 _fmt(const char * format, const struct tm * const t, char * pt, const char * const ptlim, int * warnp)
 151 {
 152         for ( ; *format; ++format) {
 153                 if (*format == '%') {
 154 label:
 155                         switch (*++format) {
 156                         case '\0':
 157                                 --format;
 158                                 break;
 159                         case 'A':
 160                                 pt = _add((t->tm_wday < 0 ||
 161                                         t->tm_wday >= DAYSPERWEEK) ?
 162                                         "?" : Locale->weekday[t->tm_wday],
 163                                         pt, ptlim);
 164                                 continue;
 165                         case 'a':
 166                                 pt = _add((t->tm_wday < 0 ||
 167                                         t->tm_wday >= DAYSPERWEEK) ?
 168                                         "?" : Locale->wday[t->tm_wday],
 169                                         pt, ptlim);
 170                                 continue;
 171                         case 'B':
 172                                 pt = _add((t->tm_mon < 0 ||
 173                                         t->tm_mon >= MONSPERYEAR) ?
 174                                         "?" : Locale->month[t->tm_mon],
 175                                         pt, ptlim);
 176                                 continue;
 177                         case 'b':
 178                         case 'h':
 179                                 pt = _add((t->tm_mon < 0 ||
 180                                         t->tm_mon >= MONSPERYEAR) ?
 181                                         "?" : Locale->mon[t->tm_mon],
 182                                         pt, ptlim);
 183                                 continue;
 184                         case 'C':
 185                                 /*
 186                                 ** %C used to do a...
 187                                 **      _fmt("%a %b %e %X %Y", t);
 188                                 ** ...whereas now POSIX 1003.2 calls for
 189                                 ** something completely different.
 190                                 ** (ado, 1993-05-24)
 191                                 */
 192                                 pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
 193                                         "%02d", pt, ptlim);
 194                                 continue;
 195                         case 'c':
 196                                 {
 197                                 int warn2 = IN_SOME;
 198
 199                                 pt = _fmt(Locale->c_fmt, t, pt, ptlim, warnp);
 200                                 if (warn2 == IN_ALL)
 201                                         warn2 = IN_THIS;
 202                                 if (warn2 > *warnp)
 203                                         *warnp = warn2;
 204                                 }
 205                                 continue;
 206                         case 'D':
 207                                 pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp);
 208                                 continue;
 209                         case 'd':
 210                                 pt = _conv(t->tm_mday, "%02d", pt, ptlim);
 211                                 continue;
 212                         case 'E':
 213                         case 'O':
 214                                 /*
 215                                 ** C99 locale modifiers.
 216                                 ** The sequences
 217                                 **      %Ec %EC %Ex %EX %Ey %EY
 218                                 **      %Od %oe %OH %OI %Om %OM
 219                                 **      %OS %Ou %OU %OV %Ow %OW %Oy
 220                                 ** are supposed to provide alternate
 221                                 ** representations.
 222                                 */
 223                                 goto label;
 224                         case 'e':
 225                                 pt = _conv(t->tm_mday, "%2d", pt, ptlim);
 226                                 continue;
 227                         case 'F':
 228                                 pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp);
 229                                 continue;
 230                         case 'H':
 231                                 pt = _conv(t->tm_hour, "%02d", pt, ptlim);
 232                                 continue;
 233                         case 'I':
 234                                 pt = _conv((t->tm_hour % 12) ?
 235                                         (t->tm_hour % 12) : 12,
 236                                         "%02d", pt, ptlim);
 237                                 continue;
 238                         case 'j':
 239                                 pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
 240                                 continue;
 241                         case 'k':
 242                                 /*
 243                                 ** This used to be...
 244                                 **      _conv(t->tm_hour % 12 ?
 245                                 **              t->tm_hour % 12 : 12, 2, ' ');
 246                                 ** ...and has been changed to the below to
 247                                 ** match SunOS 4.1.1 and Arnold Robbins'
 248                                 ** strftime version 3.0.  That is, "%k" and
 249                                 ** "%l" have been swapped.
 250                                 ** (ado, 1993-05-24)
 251                                 */
 252                                 pt = _conv(t->tm_hour, "%2d", pt, ptlim);
 253                                 continue;
 254 #ifdef KITCHEN_SINK
 255                         case 'K':
 256                                 /*
 257                                 ** After all this time, still unclaimed!
 258                                 */
 259                                 pt = _add("kitchen sink", pt, ptlim);
 260                                 continue;
 261 #endif /* defined KITCHEN_SINK */
 262                         case 'l':
 263                                 /*
 264                                 ** This used to be...
 265                                 **      _conv(t->tm_hour, 2, ' ');
 266                                 ** ...and has been changed to the below to
 267                                 ** match SunOS 4.1.1 and Arnold Robbin's
 268                                 ** strftime version 3.0.  That is, "%k" and
 269                                 ** "%l" have been swapped.
 270                                 ** (ado, 1993-05-24)
 271                                 */
 272                                 pt = _conv((t->tm_hour % 12) ?
 273                                         (t->tm_hour % 12) : 12,
 274                                         "%2d", pt, ptlim);
 275                                 continue;
 276                         case 'M':
 277                                 pt = _conv(t->tm_min, "%02d", pt, ptlim);
 278                                 continue;
 279                         case 'm':
 280                                 pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
 281                                 continue;
 282                         case 'n':
 283                                 pt = _add("\n", pt, ptlim);
 284                                 continue;
 285                         case 'p':
 286                                 pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
 287                                         Locale->pm :
 288                                         Locale->am,
 289                                         pt, ptlim);
 290                                 continue;
 291                         case 'R':
 292                                 pt = _fmt("%H:%M", t, pt, ptlim, warnp);
 293                                 continue;
 294                         case 'r':
 295                                 pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp);
 296                                 continue;
 297                         case 'S':
 298                                 pt = _conv(t->tm_sec, "%02d", pt, ptlim);
 299                                 continue;
 300                         case 's':
 301                                 {
 302                                         struct tm       tm;
 303                                         char            buf[INT_STRLEN_MAXIMUM(
 304                                                                 time_t) + 1];
 305                                         time_t          mkt;
 306
 307                                         tm = *t;
 308                                         mkt = mktime(&tm);
 309                                         if (TYPE_SIGNED(time_t))
 310                                                 (void) _snprintf(buf, sizeof buf,
 311                                                     "%ld", (long) mkt);
 312                                         else    (void) _snprintf(buf, sizeof buf,
 313                                                     "%lu", (unsigned long) mkt);
 314                                         pt = _add(buf, pt, ptlim);
 315                                 }
 316                                 continue;
 317                         case 'T':
 318                                 pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp);
 319                                 continue;
 320                         case 't':
 321                                 pt = _add("\t", pt, ptlim);
 322                                 continue;
 323                         case 'U':
 324                                 pt = _conv((t->tm_yday + DAYSPERWEEK -
 325                                         t->tm_wday) / DAYSPERWEEK,
 326                                         "%02d", pt, ptlim);
 327                                 continue;
 328                         case 'u':
 329                                 /*
 330                                 ** From Arnold Robbins' strftime version 3.0:
 331                                 ** "ISO 8601: Weekday as a decimal number
 332                                 ** [1 (Monday) - 7]"
 333                                 ** (ado, 1993-05-24)
 334                                 */
 335                                 pt = _conv((t->tm_wday == 0) ?
 336                                         DAYSPERWEEK : t->tm_wday,
 337                                         "%d", pt, ptlim);
 338                                 continue;
 339                         case 'V':       /* ISO 8601 week number */
 340                         case 'G':       /* ISO 8601 year (four digits) */
 341                         case 'g':       /* ISO 8601 year (two digits) */
 342                                 {
 343                                         int     year;
 344                                         int     yday;
 345                                         int     wday;
 346                                         int     w;
 347
 348                                         year = t->tm_year + TM_YEAR_BASE;
 349                                         yday = t->tm_yday;
 350                                         wday = t->tm_wday;
 351                                         for ( ; ; ) {
 352                                                 int     len;
 353                                                 int     bot;
 354                                                 int     top;
 355
 356                                                 len = isleap(year) ?
 357                                                         DAYSPERLYEAR :
 358                                                         DAYSPERNYEAR;
 359                                                 /*
 360                                                 ** What yday (-3 ... 3) does
 361                                                 ** the ISO year begin on?
 362                                                 */
 363                                                 bot = ((yday + 11 - wday) %
 364                                                         DAYSPERWEEK) - 3;
 365                                                 /*
 366                                                 ** What yday does the NEXT
 367                                                 ** ISO year begin on?
 368                                                 */
 369                                                 top = bot -
 370                                                         (len % DAYSPERWEEK);
 371                                                 if (top < -3)
 372                                                         top += DAYSPERWEEK;
 373                                                 top += len;
 374                                                 if (yday >= top) {
 375                                                         ++year;
 376                                                         w = 1;
 377                                                         break;
 378                                                 }
 379                                                 if (yday >= bot) {
 380                                                         w = 1 + ((yday - bot) /
 381                                                                 DAYSPERWEEK);
 382                                                         break;
 383                                                 }
 384                                                 --year;
 385                                                 yday += isleap(year) ?
 386                                                         DAYSPERLYEAR :
 387                                                         DAYSPERNYEAR;
 388                                         }
 389                                         if (*format == 'V')
 390                                                 pt = _conv(w, "%02d",
 391                                                         pt, ptlim);
 392                                         else if (*format == 'g') {
 393                                                 *warnp = IN_ALL;
 394                                                 pt = _conv(year % 100, "%02d",
 395                                                         pt, ptlim);
 396                                         } else  pt = _conv(year, "%04d",
 397                                                         pt, ptlim);
 398                                 }
 399                                 continue;
 400                         case 'v':
 401                                 pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp);
 402                                 continue;
 403                         case 'W':
 404                                 pt = _conv((t->tm_yday + DAYSPERWEEK -
 405                                         (t->tm_wday ?
 406                                         (t->tm_wday - 1) :
 407                                         (DAYSPERWEEK - 1))) / DAYSPERWEEK,
 408                                         "%02d", pt, ptlim);
 409                                 continue;
 410                         case 'w':
 411                                 pt = _conv(t->tm_wday, "%d", pt, ptlim);
 412                                 continue;
 413                         case 'X':
 414                                 pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp);
 415                                 continue;
 416                         case 'x':
 417                                 {
 418                                 int     warn2 = IN_SOME;
 419
 420                                 pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
 421                                 if (warn2 == IN_ALL)
 422                                         warn2 = IN_THIS;
 423                                 if (warn2 > *warnp)
 424                                         *warnp = warn2;
 425                                 }
 426                                 continue;
 427                         case 'y':
 428                                 *warnp = IN_ALL;
 429                                 pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
 430                                         "%02d", pt, ptlim);
 431                                 continue;
 432                         case 'Y':
 433                                 pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
 434                                         pt, ptlim);
 435                                 continue;
 436                         case 'Z':
 437                                 if (t->tm_isdst >= 0)
 438                                         pt = _add(tzname[t->tm_isdst != 0],
 439                                                 pt, ptlim);
 440                                 /*
 441                                 ** C99 says that %Z must be replaced by the
 442                                 ** empty string if the time zone is not
 443                                 ** determinable.
 444                                 */
 445                                 continue;
 446                         case 'z':
 447                                 {
 448                                 int             diff;
 449                                 char const *    sign;
 450
 451                                 if (t->tm_isdst < 0)
 452                                         continue;
 453                 continue;
 454                                 if (diff < 0) {
 455                                         sign = "-";
 456                                         diff = -diff;
 457                                 } else  sign = "+";
 458                                 pt = _add(sign, pt, ptlim);
 459                                 diff /= 60;
 460                                 pt = _conv((diff/60)*100 + diff%60,
 461                                         "%04d", pt, ptlim);
 462                                 }
 463                                 continue;
 464                         case '+':
 465                                 pt = _fmt(Locale->date_fmt, t, pt, ptlim,
 466                                         warnp);
 467                                 continue;
 468                         case '%':
 469                         default:
 470                                 break;
 471                         }
 472                 }
 473                 if (pt == ptlim)
 474                         break;
 475                 *pt++ = *format;
 476         }
 477         return pt;
 478 }
 479
 480 size_t
 481 strftime(char * const s, const size_t maxsize, const char *format, const struct tm * const t)
 482 {
 483         char *  p;
 484         int     warn;
 485
 486         //tzset();
 487
 488         warn = IN_NONE;
 489         p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn);
 490
 491         if (p == s + maxsize) {
 492                 if (maxsize > 0)
 493                         s[maxsize - 1] = '\0';
 494                 return 0;
 495         }
 496         *p = '\0';
 497         return p - s;
 498 }
 499
 500 extern "C"
 501 {
 502
 503 size_t wcsftime(wchar_t *s,
 504                 const size_t maxsize,
 505                 const wchar_t *format,
 506                 const struct tm *t)
 507 {
 508     wxCharBuffer sBuf(maxsize/sizeof(wchar_t));
 509
 510     wxString formatStr(format);
 511     wxCharBuffer bufFormatStr(formatStr.mb_str());
 512
 513     size_t sz = strftime(sBuf.data(), maxsize/sizeof(wchar_t), bufFormatStr, t);
 514
 515     wxMB2WC(s, sBuf, maxsize);
 516
 517     return sz;
 518 }
 519
 520 } /* extern "C" */
 521
 522 #define is_leap(y)   (y % 4 == 0 && (y % 100 != 0 || y % 400 == 0))
 523 #define SECONDS_IN_ONE_MINUTE      60
 524 #define DAYS_IN_ONE_YEAR          365
 525 #define SECONDS_IN_ONE_MIN         60
 526 #define SECONDS_IN_ONE_HOUR      3600
 527 #define SECONDS_IN_ONE_DAY      86400
 528 #define DEFAULT_TIMEZONE        28800
 529 #define DO_GMTIME                   0
 530 #define DO_LOCALTIME                1
 531
 532
 533 long timezone ; // global variable
 534
 535
 536 ////////////////////////////////////////////////////////////////////////
 537 // Common code for localtime and gmtime (static)
 538 ////////////////////////////////////////////////////////////////////////
 539
 540 static struct tm * __cdecl common_localtime(const time_t *t, BOOL bLocal)
 541 {
 542     wxLongLong i64;
 543     FILETIME   ft;
 544     wxString str ;
 545     SYSTEMTIME SystemTime;
 546     TIME_ZONE_INFORMATION pTz;
 547     static struct tm st_res ;             // data holder
 548     static struct tm * res = &st_res ;    // data pointer
 549     int iLeap;
 550     const unsigned short int __mon_yday[2][13] =
 551     {
 552         // Normal years
 553         { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
 554         // Leap years
 555         { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
 556     };
 557
 558     if (!*t)
 559         ::GetLocalTime(&SystemTime);
 560     else
 561     {
 562         i64 = *t;
 563         i64 = i64 * 10000000 + 116444736000000000;
 564
 565         ft.dwLowDateTime  = i64.GetLo();
 566         ft.dwHighDateTime = i64.GetHi();
 567
 568         ::FileTimeToSystemTime(&ft, &SystemTime);
 569     }
 570
 571     ::GetTimeZoneInformation(&pTz);
 572
 573     ///////////////////////////////////////////////
 574     // Set timezone
 575     timezone = pTz.Bias * SECONDS_IN_ONE_MINUTE ;
 576     ///////////////////////////////////////////////
 577
 578     iLeap = is_leap(SystemTime.wYear) ;
 579
 580     res->tm_hour = SystemTime.wHour;
 581     res->tm_min  = SystemTime.wMinute;
 582     res->tm_sec  = SystemTime.wSecond;
 583
 584     res->tm_mday = SystemTime.wDay;
 585     res->tm_mon = SystemTime.wMonth - 1; // this the correct month but localtime returns month aligned to zero
 586     res->tm_year = SystemTime.wYear;     // this the correct year
 587     res->tm_year = res->tm_year - 1900;  // but localtime returns the value starting at the 1900
 588
 589     res->tm_wday = SystemTime.wDayOfWeek;
 590     res->tm_yday = __mon_yday[iLeap][res->tm_mon] + SystemTime.wDay - 1; // localtime returns year-day aligned to zero
 591
 592     // if localtime behavior and daylight saving
 593     if (bLocal && pTz.DaylightBias != 0)
 594         res->tm_isdst = 1;
 595     else
 596         res->tm_isdst = 0; // without daylight saving or gmtime
 597
 598     return res;
 599 }
 600
 601 extern "C"
 602 {
 603
 604 ////////////////////////////////////////////////////////////////////////
 605 // Receive the number of seconds elapsed since midnight(00:00:00)
 606 // and convert a time value and corrects for the local time zone
 607 ////////////////////////////////////////////////////////////////////////
 608 struct tm * __cdecl localtime(const time_t * t)
 609 {
 610     return common_localtime(t, DO_LOCALTIME) ;
 611 }
 612
 613 ////////////////////////////////////////////////////////////////////////
 614 // Receives the number of seconds elapsed since midnight(00:00:00)
 615 // and converts a time value WITHOUT correcting for the local time zone
 616 ////////////////////////////////////////////////////////////////////////
 617 struct tm * __cdecl gmtime(const time_t *t)
 618 {
 619     return common_localtime(t, DO_GMTIME) ;
 620 }
 621
 622 }
 623
 624 ////////////////////////////////////////////////////////////////////////
 625 // Common code for conversion of struct tm into time_t   (static)
 626 ////////////////////////////////////////////////////////////////////////
 627 static time_t __cdecl common_tm_to_time(int day, int month, int year, int hour, int minute, int second)
 628 {
 629 #if 1
 630     // Use mktime since it seems less broken
 631     tm t;
 632     t.tm_isdst = -1;
 633     t.tm_hour = hour;
 634     t.tm_mday = day;
 635     t.tm_min = minute;
 636     t.tm_mon = month-1;
 637     t.tm_sec = second;
 638     t.tm_wday = -1;
 639     t.tm_yday = -1;
 640     t.tm_year = year - 1900;
 641     return mktime(& t);
 642 #else
 643     time_t prog = 0 ;
 644     static int mdays[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 } ;
 645
 646     while (--month)
 647     {
 648         prog += mdays[month - 1] ;
 649         if (month == 2 && is_leap(year))
 650             prog++ ;
 651     }
 652
 653     // Calculate seconds in elapsed days
 654     prog = day - 1 ;        // align first day of the year to zero
 655     prog += (DAYS_IN_ONE_YEAR * (year - 1970) + (year - 1901) / 4 - 19) ;
 656     prog *= SECONDS_IN_ONE_DAY ;
 657
 658     // Add Calculated elapsed seconds in the current day
 659     prog += (hour * SECONDS_IN_ONE_HOUR + minute *
 660                                SECONDS_IN_ONE_MIN + second) ;
 661
 662     return prog ;
 663 #endif
 664 }
 665
 666 extern "C"
 667 {
 668
 669 ////////////////////////////////////////////////////////////////////////
 670 // Returns the number of seconds elapsed since
 671 // midnight(00:00:00) of 1 January 1970
 672 ////////////////////////////////////////////////////////////////////////
 673 time_t __cdecl time(time_t *t)
 674 {
 675     time_t prog = 0 ;
 676
 677     if (t != NULL)
 678     {
 679         SYSTEMTIME SystemTime;
 680
 681         ::GetLocalTime(&SystemTime) ;
 682         prog = common_tm_to_time(SystemTime.wDay, SystemTime.wMonth, SystemTime.wYear,
 683                                  SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond) ;
 684         *t = prog ;
 685     }
 686
 687     return prog ;
 688 }
 689
 690 ////////////////////////////////////////////////////////////////////////
 691 // Converts the local time provided by struct tm
 692 // into a time_t calendar value
 693 // Implementation from OpenBSD
 694 ////////////////////////////////////////////////////////////////////////
 695
 696 #if 1
 697 int month_to_day[12] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
 698
 699 time_t mktime(struct tm *t)
 700 {
 701         short  month, year;
 702         time_t result;
 703
 704         month = t->tm_mon;
 705         year = t->tm_year + month / 12 + 1900;
 706         month %= 12;
 707         if (month < 0)
 708         {
 709                 year -= 1;
 710                 month += 12;
 711         }
 712         result = (year - 1970) * 365 + (year - 1969) / 4 + month_to_day[month];
 713         result = (year - 1970) * 365 + month_to_day[month];
 714         if (month <= 1)
 715                 year -= 1;
 716         result += (year - 1968) / 4;
 717         result -= (year - 1900) / 100;
 718         result += (year - 1600) / 400;
 719         result += t->tm_mday;
 720         result -= 1;
 721         result *= 24;
 722         result += t->tm_hour;
 723         result *= 60;
 724         result += t->tm_min;
 725         result *= 60;
 726         result += t->tm_sec;
 727         return(result);
 728 }
 729
 730 #else
 731 time_t __cdecl mktime(struct tm *t)
 732 {
 733     return (common_tm_to_time(t->tm_mday, t->tm_mon+1, t->tm_year+1900, t->tm_hour, t->tm_min, t->tm_sec)) ;
 734 }
 735 #endif
 736
 737 } // extern "C"
 738
 739