ext/Time/Piece/Piece.xs

   1 #ifdef __cplusplus
   2 extern "C" {
   3 #endif
   4 #include "EXTERN.h"
   5 #include "perl.h"
   6 #include "XSUB.h"
   7 #include <time.h>
   8 #ifdef __cplusplus
   9 }
  10 #endif
  11
  12 /* XXX struct tm on some systems (SunOS4/BSD) contains extra (non POSIX)
  13  * fields for which we don't have Configure support yet:
  14  *   char *tm_zone;   -- abbreviation of timezone name
  15  *   long tm_gmtoff;  -- offset from GMT in seconds
  16  * To workaround core dumps from the uninitialised tm_zone we get the
  17  * system to give us a reasonable struct to copy.  This fix means that
  18  * strftime uses the tm_zone and tm_gmtoff values returned by
  19  * localtime(time()). That should give the desired result most of the
  20  * time. But probably not always!
  21  *
  22  * This is a temporary workaround to be removed once Configure
  23  * support is added and NETaa14816 is considered in full.
  24  * It does not address tzname aspects of NETaa14816.
  25  */
  26 #if !defined(HAS_GNULIBC)
  27 # ifndef STRUCT_TM_HASZONE
  28 #    define STRUCT_TM_HASZONE
  29 # else
  30 #    define USE_TM_GMTOFF
  31 # endif
  32 #endif
  33
  34 #define    DAYS_PER_YEAR    365
  35 #define    DAYS_PER_QYEAR    (4*DAYS_PER_YEAR+1)
  36 #define    DAYS_PER_CENT    (25*DAYS_PER_QYEAR-1)
  37 #define    DAYS_PER_QCENT    (4*DAYS_PER_CENT+1)
  38 #define    SECS_PER_HOUR    (60*60)
  39 #define    SECS_PER_DAY    (24*SECS_PER_HOUR)
  40 /* parentheses deliberately absent on these two, otherwise they don't work */
  41 #define    MONTH_TO_DAYS    153/5
  42 #define    DAYS_TO_MONTH    5/153
  43 /* offset to bias by March (month 4) 1st between month/mday & year finding */
  44 #define    YEAR_ADJUST    (4*MONTH_TO_DAYS+1)
  45 /* as used here, the algorithm leaves Sunday as day 1 unless we adjust it */
  46 #define    WEEKDAY_BIAS    6    /* (1+6)%7 makes Sunday 0 again */
  47
  48 #ifdef STRUCT_TM_HASZONE
  49 static void
  50 my_init_tm(struct tm *ptm)        /* see mktime, strftime and asctime    */
  51 {
  52     Time_t now;
  53     (void)time(&now);
  54     Copy(localtime(&now), ptm, 1, struct tm);
  55 }
  56
  57 #else
  58 # define my_init_tm(ptm)
  59 #endif
  60
  61 /*
  62  * my_mini_mktime - normalise struct tm values without the localtime()
  63  * semantics (and overhead) of mktime().
  64  */
  65 static void
  66 my_mini_mktime(struct tm *ptm)
  67 {
  68     int yearday;
  69     int secs;
  70     int month, mday, year, jday;
  71     int odd_cent, odd_year;
  72
  73 /*
  74  * Year/day algorithm notes:
  75  *
  76  * With a suitable offset for numeric value of the month, one can find
  77  * an offset into the year by considering months to have 30.6 (153/5) days,
  78  * using integer arithmetic (i.e., with truncation).  To avoid too much
  79  * messing about with leap days, we consider January and February to be
  80  * the 13th and 14th month of the previous year.  After that transformation,
  81  * we need the month index we use to be high by 1 from 'normal human' usage,
  82  * so the month index values we use run from 4 through 15.
  83  *
  84  * Given that, and the rules for the Gregorian calendar (leap years are those
  85  * divisible by 4 unless also divisible by 100, when they must be divisible
  86  * by 400 instead), we can simply calculate the number of days since some
  87  * arbitrary 'beginning of time' by futzing with the (adjusted) year number,
  88  * the days we derive from our month index, and adding in the day of the
  89  * month.  The value used here is not adjusted for the actual origin which
  90  * it normally would use (1 January A.D. 1), since we're not exposing it.
  91  * We're only building the value so we can turn around and get the
  92  * normalised values for the year, month, day-of-month, and day-of-year.
  93  *
  94  * For going backward, we need to bias the value we're using so that we find
  95  * the right year value.  (Basically, we don't want the contribution of
  96  * March 1st to the number to apply while deriving the year).  Having done
  97  * that, we 'count up' the contribution to the year number by accounting for
  98  * full quadracenturies (400-year periods) with their extra leap days, plus
  99  * the contribution from full centuries (to avoid counting in the lost leap
 100  * days), plus the contribution from full quad-years (to count in the normal
 101  * leap days), plus the leftover contribution from any non-leap years.
 102  * At this point, if we were working with an actual leap day, we'll have 0
 103  * days left over.  This is also true for March 1st, however.  So, we have
 104  * to special-case that result, and (earlier) keep track of the 'odd'
 105  * century and year contributions.  If we got 4 extra centuries in a qcent,
 106  * or 4 extra years in a qyear, then it's a leap day and we call it 29 Feb.
 107  * Otherwise, we add back in the earlier bias we removed (the 123 from
 108  * figuring in March 1st), find the month index (integer division by 30.6),
 109  * and the remainder is the day-of-month.  We then have to convert back to
 110  * 'real' months (including fixing January and February from being 14/15 in
 111  * the previous year to being in the proper year).  After that, to get
 112  * tm_yday, we work with the normalised year and get a new yearday value for
 113  * January 1st, which we subtract from the yearday value we had earlier,
 114  * representing the date we've re-built.  This is done from January 1
 115  * because tm_yday is 0-origin.
 116  *
 117  * Since POSIX time routines are only guaranteed to work for times since the
 118  * UNIX epoch (00:00:00 1 Jan 1970 UTC), the fact that this algorithm
 119  * applies Gregorian calendar rules even to dates before the 16th century
 120  * doesn't bother me.  Besides, you'd need cultural context for a given
 121  * date to know whether it was Julian or Gregorian calendar, and that's
 122  * outside the scope for this routine.  Since we convert back based on the
 123  * same rules we used to build the yearday, you'll only get strange results
 124  * for input which needed normalising, or for the 'odd' century years which
 125  * were leap years in the Julian calander but not in the Gregorian one.
 126  * I can live with that.
 127  *
 128  * This algorithm also fails to handle years before A.D. 1 gracefully, but
 129  * that's still outside the scope for POSIX time manipulation, so I don't
 130  * care.
 131  */
 132
 133     year = 1900 + ptm->tm_year;
 134     month = ptm->tm_mon;
 135     mday = ptm->tm_mday;
 136     /* allow given yday with no month & mday to dominate the result */
 137     if (ptm->tm_yday >= 0 && mday <= 0 && month <= 0) {
 138         month = 0;
 139         mday = 0;
 140         jday = 1 + ptm->tm_yday;
 141     }
 142     else {
 143         jday = 0;
 144     }
 145     if (month >= 2)
 146         month+=2;
 147     else
 148         month+=14, year--;
 149
 150     yearday = DAYS_PER_YEAR * year + year/4 - year/100 + year/400;
 151     yearday += month*MONTH_TO_DAYS + mday + jday;
 152     /*
 153      * Note that we don't know when leap-seconds were or will be,
 154      * so we have to trust the user if we get something which looks
 155      * like a sensible leap-second.  Wild values for seconds will
 156      * be rationalised, however.
 157      */
 158     if ((unsigned) ptm->tm_sec <= 60) {
 159         secs = 0;
 160     }
 161     else {
 162         secs = ptm->tm_sec;
 163         ptm->tm_sec = 0;
 164     }
 165     secs += 60 * ptm->tm_min;
 166     secs += SECS_PER_HOUR * ptm->tm_hour;
 167     if (secs < 0) {
 168         if (secs-(secs/SECS_PER_DAY*SECS_PER_DAY) < 0) {
 169             /* got negative remainder, but need positive time */
 170             /* back off an extra day to compensate */
 171             yearday += (secs/SECS_PER_DAY)-1;
 172             secs -= SECS_PER_DAY * (secs/SECS_PER_DAY - 1);
 173         }
 174         else {
 175             yearday += (secs/SECS_PER_DAY);
 176             secs -= SECS_PER_DAY * (secs/SECS_PER_DAY);
 177         }
 178     }
 179     else if (secs >= SECS_PER_DAY) {
 180         yearday += (secs/SECS_PER_DAY);
 181         secs %= SECS_PER_DAY;
 182     }
 183     ptm->tm_hour = secs/SECS_PER_HOUR;
 184     secs %= SECS_PER_HOUR;
 185     ptm->tm_min = secs/60;
 186     secs %= 60;
 187     ptm->tm_sec += secs;
 188     /* done with time of day effects */
 189     /*
 190      * The algorithm for yearday has (so far) left it high by 428.
 191      * To avoid mistaking a legitimate Feb 29 as Mar 1, we need to
 192      * bias it by 123 while trying to figure out what year it
 193      * really represents.  Even with this tweak, the reverse
 194      * translation fails for years before A.D. 0001.
 195      * It would still fail for Feb 29, but we catch that one below.
 196      */
 197     jday = yearday;    /* save for later fixup vis-a-vis Jan 1 */
 198     yearday -= YEAR_ADJUST;
 199     year = (yearday / DAYS_PER_QCENT) * 400;
 200     yearday %= DAYS_PER_QCENT;
 201     odd_cent = yearday / DAYS_PER_CENT;
 202     year += odd_cent * 100;
 203     yearday %= DAYS_PER_CENT;
 204     year += (yearday / DAYS_PER_QYEAR) * 4;
 205     yearday %= DAYS_PER_QYEAR;
 206     odd_year = yearday / DAYS_PER_YEAR;
 207     year += odd_year;
 208     yearday %= DAYS_PER_YEAR;
 209     if (!yearday && (odd_cent==4 || odd_year==4)) { /* catch Feb 29 */
 210         month = 1;
 211         yearday = 29;
 212     }
 213     else {
 214         yearday += YEAR_ADJUST;    /* recover March 1st crock */
 215         month = yearday*DAYS_TO_MONTH;
 216         yearday -= month*MONTH_TO_DAYS;
 217         /* recover other leap-year adjustment */
 218         if (month > 13) {
 219             month-=14;
 220             year++;
 221         }
 222         else {
 223             month-=2;
 224         }
 225     }
 226     ptm->tm_year = year - 1900;
 227     if (yearday) {
 228       ptm->tm_mday = yearday;
 229       ptm->tm_mon = month;
 230     }
 231     else {
 232       ptm->tm_mday = 31;
 233       ptm->tm_mon = month - 1;
 234     }
 235     /* re-build yearday based on Jan 1 to get tm_yday */
 236     year--;
 237     yearday = year*DAYS_PER_YEAR + year/4 - year/100 + year/400;
 238     yearday += 14*MONTH_TO_DAYS + 1;
 239     ptm->tm_yday = jday - yearday;
 240     /* fix tm_wday if not overridden by caller */
 241     ptm->tm_wday = (jday + WEEKDAY_BIAS) % 7;
 242 }
 243
 244 #if defined(WIN32) || (defined(__QNX__) && defined(__WATCOMC__)) /* No strptime on Win32 or QNX4 */
 245 #define strncasecmp(x,y,n) strnicmp(x,y,n)
 246
 247 #if defined(WIN32)
 248 #define alloca _alloca
 249 #endif
 250
 251 #include <time.h>
 252 #include <ctype.h>
 253 #include <string.h>
 254 #ifdef _THREAD_SAFE
 255 #include <pthread.h>
 256 #include "pthread_private.h"
 257 #endif /* _THREAD_SAFE */
 258
 259 static char * _strptime(const char *, const char *, struct tm *);
 260
 261 #ifdef _THREAD_SAFE
 262 static struct pthread_mutex     _gotgmt_mutexd = PTHREAD_MUTEX_STATIC_INITIALIZER;
 263 static pthread_mutex_t          gotgmt_mutex   = &_gotgmt_mutexd;
 264 #endif
 265 static int got_GMT;
 266
 267 #define asizeof(a)      (sizeof (a) / sizeof ((a)[0]))
 268
 269 struct lc_time_T {
 270     const char *    mon[12];
 271     const char *    month[12];
 272     const char *    wday[7];
 273     const char *    weekday[7];
 274     const char *    X_fmt;
 275     const char *    x_fmt;
 276     const char *    c_fmt;
 277     const char *    am;
 278     const char *    pm;
 279     const char *    date_fmt;
 280     const char *    alt_month[12];
 281     const char *    Ef_fmt;
 282     const char *    EF_fmt;
 283 };
 284
 285 struct lc_time_T _time_localebuf;
 286 int _time_using_locale;
 287
 288 const struct lc_time_T  _C_time_locale = {
 289         {
 290                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 291                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 292         }, {
 293                 "January", "February", "March", "April", "May", "June",
 294                 "July", "August", "September", "October", "November", "December"
 295         }, {
 296                 "Sun", "Mon", "Tue", "Wed",
 297                 "Thu", "Fri", "Sat"
 298         }, {
 299                 "Sunday", "Monday", "Tuesday", "Wednesday",
 300                 "Thursday", "Friday", "Saturday"
 301         },
 302
 303         /* X_fmt */
 304         "%H:%M:%S",
 305
 306         /*
 307         ** x_fmt
 308         ** Since the C language standard calls for
 309         ** "date, using locale's date format," anything goes.
 310         ** Using just numbers (as here) makes Quakers happier;
 311         ** it's also compatible with SVR4.
 312         */
 313         "%m/%d/%y",
 314
 315         /*
 316         ** c_fmt (ctime-compatible)
 317         ** Not used, just compatibility placeholder.
 318         */
 319         NULL,
 320
 321         /* am */
 322         "AM",
 323
 324         /* pm */
 325         "PM",
 326
 327         /* date_fmt */
 328         "%a %Ef %X %Z %Y",
 329
 330         {
 331                 "January", "February", "March", "April", "May", "June",
 332                 "July", "August", "September", "October", "November", "December"
 333         },
 334
 335         /* Ef_fmt
 336         ** To determine short months / day order
 337         */
 338         "%b %e",
 339
 340         /* EF_fmt
 341         ** To determine long months / day order
 342         */
 343         "%B %e"
 344 };
 345
 346 #define Locale (&_C_time_locale)
 347
 348 static char *
 349 _strptime(const char *buf, const char *fmt, struct tm *tm)
 350 {
 351         char c;
 352         const char *ptr;
 353         int i,
 354                 len;
 355         int Ealternative, Oalternative;
 356
 357         ptr = fmt;
 358         while (*ptr != 0) {
 359                 if (*buf == 0)
 360                         break;
 361
 362                 c = *ptr++;
 363
 364                 if (c != '%') {
 365                         if (isspace((unsigned char)c))
 366                                 while (*buf != 0 && isspace((unsigned char)*buf))
 367                                         buf++;
 368                         else if (c != *buf++)
 369                                 return 0;
 370                         continue;
 371                 }
 372
 373                 Ealternative = 0;
 374                 Oalternative = 0;
 375 label:
 376                 c = *ptr++;
 377                 switch (c) {
 378                 case 0:
 379                 case '%':
 380                         if (*buf++ != '%')
 381                                 return 0;
 382                         break;
 383
 384                 case '+':
 385                         buf = _strptime(buf, Locale->date_fmt, tm);
 386                         if (buf == 0)
 387                                 return 0;
 388                         break;
 389
 390                 case 'C':
 391                         if (!isdigit((unsigned char)*buf))
 392                                 return 0;
 393
 394                         /* XXX This will break for 3-digit centuries. */
 395                         len = 2;
 396                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 397                                 i *= 10;
 398                                 i += *buf - '0';
 399                                 len--;
 400                         }
 401                         if (i < 19)
 402                                 return 0;
 403
 404                         tm->tm_year = i * 100 - 1900;
 405                         break;
 406
 407                 case 'c':
 408                         /* NOTE: c_fmt is intentionally ignored */
 409                         buf = _strptime(buf, "%a %Ef %T %Y", tm);
 410                         if (buf == 0)
 411                                 return 0;
 412                         break;
 413
 414                 case 'D':
 415                         buf = _strptime(buf, "%m/%d/%y", tm);
 416                         if (buf == 0)
 417                                 return 0;
 418                         break;
 419
 420                 case 'E':
 421                         if (Ealternative || Oalternative)
 422                                 break;
 423                         Ealternative++;
 424                         goto label;
 425
 426                 case 'O':
 427                         if (Ealternative || Oalternative)
 428                                 break;
 429                         Oalternative++;
 430                         goto label;
 431
 432                 case 'F':
 433                 case 'f':
 434                         if (!Ealternative)
 435                                 break;
 436                         buf = _strptime(buf, (c == 'f') ? Locale->Ef_fmt : Locale->EF_fmt, tm);
 437                         if (buf == 0)
 438                                 return 0;
 439                         break;
 440
 441                 case 'R':
 442                         buf = _strptime(buf, "%H:%M", tm);
 443                         if (buf == 0)
 444                                 return 0;
 445                         break;
 446
 447                 case 'r':
 448                         buf = _strptime(buf, "%I:%M:%S %p", tm);
 449                         if (buf == 0)
 450                                 return 0;
 451                         break;
 452
 453                 case 'T':
 454                         buf = _strptime(buf, "%H:%M:%S", tm);
 455                         if (buf == 0)
 456                                 return 0;
 457                         break;
 458
 459                 case 'X':
 460                         buf = _strptime(buf, Locale->X_fmt, tm);
 461                         if (buf == 0)
 462                                 return 0;
 463                         break;
 464
 465                 case 'x':
 466                         buf = _strptime(buf, Locale->x_fmt, tm);
 467                         if (buf == 0)
 468                                 return 0;
 469                         break;
 470
 471                 case 'j':
 472                         if (!isdigit((unsigned char)*buf))
 473                                 return 0;
 474
 475                         len = 3;
 476                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 477                                 i *= 10;
 478                                 i += *buf - '0';
 479                                 len--;
 480                         }
 481                         if (i < 1 || i > 366)
 482                                 return 0;
 483
 484                         tm->tm_yday = i - 1;
 485                         break;
 486
 487                 case 'M':
 488                 case 'S':
 489                         if (*buf == 0 || isspace((unsigned char)*buf))
 490                                 break;
 491
 492                         if (!isdigit((unsigned char)*buf))
 493                                 return 0;
 494
 495                         len = 2;
 496                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 497                                 i *= 10;
 498                                 i += *buf - '0';
 499                                 len--;
 500                         }
 501
 502                         if (c == 'M') {
 503                                 if (i > 59)
 504                                         return 0;
 505                                 tm->tm_min = i;
 506                         } else {
 507                                 if (i > 60)
 508                                         return 0;
 509                                 tm->tm_sec = i;
 510                         }
 511
 512                         if (*buf != 0 && isspace((unsigned char)*buf))
 513                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 514                                         ptr++;
 515                         break;
 516
 517                 case 'H':
 518                 case 'I':
 519                 case 'k':
 520                 case 'l':
 521                         /*
 522                          * Of these, %l is the only specifier explicitly
 523                          * documented as not being zero-padded.  However,
 524                          * there is no harm in allowing zero-padding.
 525                          *
 526                          * XXX The %l specifier may gobble one too many
 527                          * digits if used incorrectly.
 528                          */
 529                         if (!isdigit((unsigned char)*buf))
 530                                 return 0;
 531
 532                         len = 2;
 533                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 534                                 i *= 10;
 535                                 i += *buf - '0';
 536                                 len--;
 537                         }
 538                         if (c == 'H' || c == 'k') {
 539                                 if (i > 23)
 540                                         return 0;
 541                         } else if (i > 12)
 542                                 return 0;
 543
 544                         tm->tm_hour = i;
 545
 546                         if (*buf != 0 && isspace((unsigned char)*buf))
 547                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 548                                         ptr++;
 549                         break;
 550
 551                 case 'p':
 552                         /*
 553                          * XXX This is bogus if parsed before hour-related
 554                          * specifiers.
 555                          */
 556                         len = strlen(Locale->am);
 557                         if (strncasecmp(buf, Locale->am, len) == 0) {
 558                                 if (tm->tm_hour > 12)
 559                                         return 0;
 560                                 if (tm->tm_hour == 12)
 561                                         tm->tm_hour = 0;
 562                                 buf += len;
 563                                 break;
 564                         }
 565
 566                         len = strlen(Locale->pm);
 567                         if (strncasecmp(buf, Locale->pm, len) == 0) {
 568                                 if (tm->tm_hour > 12)
 569                                         return 0;
 570                                 if (tm->tm_hour != 12)
 571                                         tm->tm_hour += 12;
 572                                 buf += len;
 573                                 break;
 574                         }
 575
 576                         return 0;
 577
 578                 case 'A':
 579                 case 'a':
 580                         for (i = 0; i < asizeof(Locale->weekday); i++) {
 581                                 if (c == 'A') {
 582                                         len = strlen(Locale->weekday[i]);
 583                                         if (strncasecmp(buf,
 584                                                         Locale->weekday[i],
 585                                                         len) == 0)
 586                                                 break;
 587                                 } else {
 588                                         len = strlen(Locale->wday[i]);
 589                                         if (strncasecmp(buf,
 590                                                         Locale->wday[i],
 591                                                         len) == 0)
 592                                                 break;
 593                                 }
 594                         }
 595                         if (i == asizeof(Locale->weekday))
 596                                 return 0;
 597
 598                         tm->tm_wday = i;
 599                         buf += len;
 600                         break;
 601
 602                 case 'U':
 603                 case 'W':
 604                         /*
 605                          * XXX This is bogus, as we can not assume any valid
 606                          * information present in the tm structure at this
 607                          * point to calculate a real value, so just check the
 608                          * range for now.
 609                          */
 610                         if (!isdigit((unsigned char)*buf))
 611                                 return 0;
 612
 613                         len = 2;
 614                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 615                                 i *= 10;
 616                                 i += *buf - '0';
 617                                 len--;
 618                         }
 619                         if (i > 53)
 620                                 return 0;
 621
 622                         if (*buf != 0 && isspace((unsigned char)*buf))
 623                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 624                                         ptr++;
 625                         break;
 626
 627                 case 'w':
 628                         if (!isdigit((unsigned char)*buf))
 629                                 return 0;
 630
 631                         i = *buf - '0';
 632                         if (i > 6)
 633                                 return 0;
 634
 635                         tm->tm_wday = i;
 636
 637                         if (*buf != 0 && isspace((unsigned char)*buf))
 638                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 639                                         ptr++;
 640                         break;
 641
 642                 case 'd':
 643                 case 'e':
 644                         /*
 645                          * The %e specifier is explicitly documented as not
 646                          * being zero-padded but there is no harm in allowing
 647                          * such padding.
 648                          *
 649                          * XXX The %e specifier may gobble one too many
 650                          * digits if used incorrectly.
 651                          */
 652                         if (!isdigit((unsigned char)*buf))
 653                                 return 0;
 654
 655                         len = 2;
 656                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 657                                 i *= 10;
 658                                 i += *buf - '0';
 659                                 len--;
 660                         }
 661                         if (i > 31)
 662                                 return 0;
 663
 664                         tm->tm_mday = i;
 665
 666                         if (*buf != 0 && isspace((unsigned char)*buf))
 667                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 668                                         ptr++;
 669                         break;
 670
 671                 case 'B':
 672                 case 'b':
 673                 case 'h':
 674                         for (i = 0; i < asizeof(Locale->month); i++) {
 675                                 if (Oalternative) {
 676                                         if (c == 'B') {
 677                                                 len = strlen(Locale->alt_month[i]);
 678                                                 if (strncasecmp(buf,
 679                                                                 Locale->alt_month[i],
 680                                                                 len) == 0)
 681                                                         break;
 682                                         }
 683                                 } else {
 684                                         if (c == 'B') {
 685                                                 len = strlen(Locale->month[i]);
 686                                                 if (strncasecmp(buf,
 687                                                                 Locale->month[i],
 688                                                                 len) == 0)
 689                                                         break;
 690                                         } else {
 691                                                 len = strlen(Locale->mon[i]);
 692                                                 if (strncasecmp(buf,
 693                                                                 Locale->mon[i],
 694                                                                 len) == 0)
 695                                                         break;
 696                                         }
 697                                 }
 698                         }
 699                         if (i == asizeof(Locale->month))
 700                                 return 0;
 701
 702                         tm->tm_mon = i;
 703                         buf += len;
 704                         break;
 705
 706                 case 'm':
 707                         if (!isdigit((unsigned char)*buf))
 708                                 return 0;
 709
 710                         len = 2;
 711                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 712                                 i *= 10;
 713                                 i += *buf - '0';
 714                                 len--;
 715                         }
 716                         if (i < 1 || i > 12)
 717                                 return 0;
 718
 719                         tm->tm_mon = i - 1;
 720
 721                         if (*buf != 0 && isspace((unsigned char)*buf))
 722                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 723                                         ptr++;
 724                         break;
 725
 726                 case 'Y':
 727                 case 'y':
 728                         if (*buf == 0 || isspace((unsigned char)*buf))
 729                                 break;
 730
 731                         if (!isdigit((unsigned char)*buf))
 732                                 return 0;
 733
 734                         len = (c == 'Y') ? 4 : 2;
 735                         for (i = 0; len && *buf != 0 && isdigit((unsigned char)*buf); buf++) {
 736                                 i *= 10;
 737                                 i += *buf - '0';
 738                                 len--;
 739                         }
 740                         if (c == 'Y')
 741                                 i -= 1900;
 742                         if (c == 'y' && i < 69)
 743                                 i += 100;
 744                         if (i < 0)
 745                                 return 0;
 746
 747                         tm->tm_year = i;
 748
 749                         if (*buf != 0 && isspace((unsigned char)*buf))
 750                                 while (*ptr != 0 && !isspace((unsigned char)*ptr))
 751                                         ptr++;
 752                         break;
 753
 754                 case 'Z':
 755                         {
 756                         const char *cp;
 757                         char *zonestr;
 758
 759                         for (cp = buf; *cp && isupper((unsigned char)*cp); ++cp)
 760                             {/*empty*/}
 761                         if (cp - buf) {
 762                                 zonestr = (char *)alloca(cp - buf + 1);
 763                                 strncpy(zonestr, buf, cp - buf);
 764                                 zonestr[cp - buf] = '\0';
 765                                 tzset();
 766                                 if (0 == strcmp(zonestr, "GMT")) {
 767                                     got_GMT = 1;
 768                                 } else {
 769                                     return 0;
 770                                 }
 771                                 buf += cp - buf;
 772                         }
 773                         }
 774                         break;
 775                 }
 776         }
 777         return (char *)buf;
 778 }
 779
 780
 781 char *
 782 strptime(const char *buf, const char *fmt, struct tm *tm)
 783 {
 784         char *ret;
 785
 786 #ifdef _THREAD_SAFE
 787 pthread_mutex_lock(&gotgmt_mutex);
 788 #endif
 789
 790         got_GMT = 0;
 791         ret = _strptime(buf, fmt, tm);
 792
 793 #ifdef _THREAD_SAFE
 794         pthread_mutex_unlock(&gotgmt_mutex);
 795 #endif
 796
 797         return ret;
 798 }
 799
 800 #endif /* Mac OS X */
 801
 802 MODULE = Time::Piece     PACKAGE = Time::Piece
 803
 804 PROTOTYPES: ENABLE
 805
 806 void
 807 _strftime(fmt, sec, min, hour, mday, mon, year, wday = -1, yday = -1, isdst = -1)
 808     char *        fmt
 809     int        sec
 810     int        min
 811     int        hour
 812     int        mday
 813     int        mon
 814     int        year
 815     int        wday
 816     int        yday
 817     int        isdst
 818     CODE:
 819     {
 820         char tmpbuf[128];
 821         struct tm mytm;
 822         int len;
 823         memset(&mytm, 0, sizeof(mytm));
 824         my_init_tm(&mytm);    /* XXX workaround - see my_init_tm() above */
 825         mytm.tm_sec = sec;
 826         mytm.tm_min = min;
 827         mytm.tm_hour = hour;
 828         mytm.tm_mday = mday;
 829         mytm.tm_mon = mon;
 830         mytm.tm_year = year;
 831         mytm.tm_wday = wday;
 832         mytm.tm_yday = yday;
 833         mytm.tm_isdst = isdst;
 834         my_mini_mktime(&mytm);
 835         len = strftime(tmpbuf, sizeof tmpbuf, fmt, &mytm);
 836         /*
 837         ** The following is needed to handle to the situation where
 838         ** tmpbuf overflows.  Basically we want to allocate a buffer
 839         ** and try repeatedly.  The reason why it is so complicated
 840         ** is that getting a return value of 0 from strftime can indicate
 841         ** one of the following:
 842         ** 1. buffer overflowed,
 843         ** 2. illegal conversion specifier, or
 844         ** 3. the format string specifies nothing to be returned(not
 845         **      an error).  This could be because format is an empty string
 846         **    or it specifies %p that yields an empty string in some locale.
 847         ** If there is a better way to make it portable, go ahead by
 848         ** all means.
 849         */
 850         if ((len > 0 && len < sizeof(tmpbuf)) || (len == 0 && *fmt == '\0'))
 851         ST(0) = sv_2mortal(newSVpv(tmpbuf, len));
 852         else {
 853         /* Possibly buf overflowed - try again with a bigger buf */
 854         int     fmtlen = strlen(fmt);
 855         int    bufsize = fmtlen + sizeof(tmpbuf);
 856         char*     buf;
 857         int    buflen;
 858
 859         New(0, buf, bufsize, char);
 860         while (buf) {
 861             buflen = strftime(buf, bufsize, fmt, &mytm);
 862             if (buflen > 0 && buflen < bufsize)
 863             break;
 864             /* heuristic to prevent out-of-memory errors */
 865             if (bufsize > 100*fmtlen) {
 866             Safefree(buf);
 867             buf = NULL;
 868             break;
 869             }
 870             bufsize *= 2;
 871             Renew(buf, bufsize, char);
 872         }
 873         if (buf) {
 874             ST(0) = sv_2mortal(newSVpv(buf, buflen));
 875             Safefree(buf);
 876         }
 877         else
 878             ST(0) = sv_2mortal(newSVpv(tmpbuf, len));
 879         }
 880     }
 881
 882 void
 883 _tzset()
 884   PPCODE:
 885     tzset();
 886
 887
 888 void
 889 _strptime ( string, format )
 890         char * string
 891         char * format
 892   PREINIT:
 893        struct tm mytm;
 894        time_t t;
 895        char * remainder;
 896   PPCODE:
 897        t = 0;
 898        mytm = *gmtime(&t);
 899
 900        remainder = (char *)strptime(string, format, &mytm);
 901
 902        if (remainder == NULL) {
 903           croak("Error parsing time");
 904        }
 905
 906        if (*remainder != '\0') {
 907            warn("garbage at end of string in strptime: %s", remainder);
 908        }
 909
 910        my_mini_mktime(&mytm);
 911
 912   /* warn("tm: %d-%d-%d %d:%d:%d\n", mytm.tm_year, mytm.tm_mon, mytm.tm_mday, mytm.tm_hour, mytm.tm_min, mytm.tm_sec); */
 913
 914        EXTEND(SP, 11);
 915        PUSHs(sv_2mortal(newSViv(mytm.tm_sec)));
 916        PUSHs(sv_2mortal(newSViv(mytm.tm_min)));
 917        PUSHs(sv_2mortal(newSViv(mytm.tm_hour)));
 918        PUSHs(sv_2mortal(newSViv(mytm.tm_mday)));
 919        PUSHs(sv_2mortal(newSViv(mytm.tm_mon)));
 920        PUSHs(sv_2mortal(newSViv(mytm.tm_year)));
 921        PUSHs(sv_2mortal(newSViv(mytm.tm_wday)));
 922        PUSHs(sv_2mortal(newSViv(mytm.tm_yday)));
 923        /* isdst */
 924        PUSHs(sv_2mortal(newSViv(0)));
 925        /* epoch */
 926        PUSHs(sv_2mortal(newSViv(0)));
 927        /* islocal */
 928        PUSHs(sv_2mortal(newSViv(0)));