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datetime.c
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1 /*-------------------------------------------------------------------------
2  *
3  * datetime.c
4  * Support functions for date/time types.
5  *
6  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/utils/adt/datetime.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 #include "postgres.h"
16 
17 #include <ctype.h>
18 #include <limits.h>
19 #include <math.h>
20 
21 #include "access/htup_details.h"
22 #include "access/xact.h"
23 #include "catalog/pg_type.h"
24 #include "common/string.h"
25 #include "funcapi.h"
26 #include "miscadmin.h"
27 #include "nodes/nodeFuncs.h"
28 #include "utils/builtins.h"
29 #include "utils/date.h"
30 #include "utils/datetime.h"
31 #include "utils/memutils.h"
32 #include "utils/tzparser.h"
33 
34 static int DecodeNumber(int flen, char *field, bool haveTextMonth,
35  int fmask, int *tmask,
36  struct pg_tm *tm, fsec_t *fsec, bool *is2digits);
37 static int DecodeNumberField(int len, char *str,
38  int fmask, int *tmask,
39  struct pg_tm *tm, fsec_t *fsec, bool *is2digits);
40 static int DecodeTime(char *str, int fmask, int range,
41  int *tmask, struct pg_tm *tm, fsec_t *fsec);
42 static const datetkn *datebsearch(const char *key, const datetkn *base, int nel);
43 static int DecodeDate(char *str, int fmask, int *tmask, bool *is2digits,
44  struct pg_tm *tm);
45 static char *AppendSeconds(char *cp, int sec, fsec_t fsec,
46  int precision, bool fillzeros);
47 static void AdjustFractSeconds(double frac, struct pg_tm *tm, fsec_t *fsec,
48  int scale);
49 static void AdjustFractDays(double frac, struct pg_tm *tm, fsec_t *fsec,
50  int scale);
51 static int DetermineTimeZoneOffsetInternal(struct pg_tm *tm, pg_tz *tzp,
52  pg_time_t *tp);
53 static bool DetermineTimeZoneAbbrevOffsetInternal(pg_time_t t,
54  const char *abbr, pg_tz *tzp,
55  int *offset, int *isdst);
56 static pg_tz *FetchDynamicTimeZone(TimeZoneAbbrevTable *tbl, const datetkn *tp);
57 
58 
59 const int day_tab[2][13] =
60 {
61  {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0},
62  {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0}
63 };
64 
65 const char *const months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
66 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL};
67 
68 const char *const days[] = {"Sunday", "Monday", "Tuesday", "Wednesday",
69 "Thursday", "Friday", "Saturday", NULL};
70 
71 
72 /*****************************************************************************
73  * PRIVATE ROUTINES *
74  *****************************************************************************/
75 
76 /*
77  * datetktbl holds date/time keywords.
78  *
79  * Note that this table must be strictly alphabetically ordered to allow an
80  * O(ln(N)) search algorithm to be used.
81  *
82  * The token field must be NUL-terminated; we truncate entries to TOKMAXLEN
83  * characters to fit.
84  *
85  * The static table contains no TZ, DTZ, or DYNTZ entries; rather those
86  * are loaded from configuration files and stored in zoneabbrevtbl, whose
87  * abbrevs[] field has the same format as the static datetktbl.
88  */
89 static const datetkn datetktbl[] = {
90  /* token, type, value */
91  {EARLY, RESERV, DTK_EARLY}, /* "-infinity" reserved for "early time" */
92  {DA_D, ADBC, AD}, /* "ad" for years > 0 */
93  {"allballs", RESERV, DTK_ZULU}, /* 00:00:00 */
94  {"am", AMPM, AM},
95  {"apr", MONTH, 4},
96  {"april", MONTH, 4},
97  {"at", IGNORE_DTF, 0}, /* "at" (throwaway) */
98  {"aug", MONTH, 8},
99  {"august", MONTH, 8},
100  {DB_C, ADBC, BC}, /* "bc" for years <= 0 */
101  {"d", UNITS, DTK_DAY}, /* "day of month" for ISO input */
102  {"dec", MONTH, 12},
103  {"december", MONTH, 12},
104  {"dow", UNITS, DTK_DOW}, /* day of week */
105  {"doy", UNITS, DTK_DOY}, /* day of year */
106  {"dst", DTZMOD, SECS_PER_HOUR},
107  {EPOCH, RESERV, DTK_EPOCH}, /* "epoch" reserved for system epoch time */
108  {"feb", MONTH, 2},
109  {"february", MONTH, 2},
110  {"fri", DOW, 5},
111  {"friday", DOW, 5},
112  {"h", UNITS, DTK_HOUR}, /* "hour" */
113  {LATE, RESERV, DTK_LATE}, /* "infinity" reserved for "late time" */
114  {"isodow", UNITS, DTK_ISODOW}, /* ISO day of week, Sunday == 7 */
115  {"isoyear", UNITS, DTK_ISOYEAR}, /* year in terms of the ISO week date */
116  {"j", UNITS, DTK_JULIAN},
117  {"jan", MONTH, 1},
118  {"january", MONTH, 1},
119  {"jd", UNITS, DTK_JULIAN},
120  {"jul", MONTH, 7},
121  {"julian", UNITS, DTK_JULIAN},
122  {"july", MONTH, 7},
123  {"jun", MONTH, 6},
124  {"june", MONTH, 6},
125  {"m", UNITS, DTK_MONTH}, /* "month" for ISO input */
126  {"mar", MONTH, 3},
127  {"march", MONTH, 3},
128  {"may", MONTH, 5},
129  {"mm", UNITS, DTK_MINUTE}, /* "minute" for ISO input */
130  {"mon", DOW, 1},
131  {"monday", DOW, 1},
132  {"nov", MONTH, 11},
133  {"november", MONTH, 11},
134  {NOW, RESERV, DTK_NOW}, /* current transaction time */
135  {"oct", MONTH, 10},
136  {"october", MONTH, 10},
137  {"on", IGNORE_DTF, 0}, /* "on" (throwaway) */
138  {"pm", AMPM, PM},
139  {"s", UNITS, DTK_SECOND}, /* "seconds" for ISO input */
140  {"sat", DOW, 6},
141  {"saturday", DOW, 6},
142  {"sep", MONTH, 9},
143  {"sept", MONTH, 9},
144  {"september", MONTH, 9},
145  {"sun", DOW, 0},
146  {"sunday", DOW, 0},
147  {"t", ISOTIME, DTK_TIME}, /* Filler for ISO time fields */
148  {"thu", DOW, 4},
149  {"thur", DOW, 4},
150  {"thurs", DOW, 4},
151  {"thursday", DOW, 4},
152  {TODAY, RESERV, DTK_TODAY}, /* midnight */
153  {TOMORROW, RESERV, DTK_TOMORROW}, /* tomorrow midnight */
154  {"tue", DOW, 2},
155  {"tues", DOW, 2},
156  {"tuesday", DOW, 2},
157  {"wed", DOW, 3},
158  {"wednesday", DOW, 3},
159  {"weds", DOW, 3},
160  {"y", UNITS, DTK_YEAR}, /* "year" for ISO input */
161  {YESTERDAY, RESERV, DTK_YESTERDAY} /* yesterday midnight */
162 };
163 
164 static const int szdatetktbl = sizeof datetktbl / sizeof datetktbl[0];
165 
166 /*
167  * deltatktbl: same format as datetktbl, but holds keywords used to represent
168  * time units (eg, for intervals, and for EXTRACT).
169  */
170 static const datetkn deltatktbl[] = {
171  /* token, type, value */
172  {"@", IGNORE_DTF, 0}, /* postgres relative prefix */
173  {DAGO, AGO, 0}, /* "ago" indicates negative time offset */
174  {"c", UNITS, DTK_CENTURY}, /* "century" relative */
175  {"cent", UNITS, DTK_CENTURY}, /* "century" relative */
176  {"centuries", UNITS, DTK_CENTURY}, /* "centuries" relative */
177  {DCENTURY, UNITS, DTK_CENTURY}, /* "century" relative */
178  {"d", UNITS, DTK_DAY}, /* "day" relative */
179  {DDAY, UNITS, DTK_DAY}, /* "day" relative */
180  {"days", UNITS, DTK_DAY}, /* "days" relative */
181  {"dec", UNITS, DTK_DECADE}, /* "decade" relative */
182  {DDECADE, UNITS, DTK_DECADE}, /* "decade" relative */
183  {"decades", UNITS, DTK_DECADE}, /* "decades" relative */
184  {"decs", UNITS, DTK_DECADE}, /* "decades" relative */
185  {"h", UNITS, DTK_HOUR}, /* "hour" relative */
186  {DHOUR, UNITS, DTK_HOUR}, /* "hour" relative */
187  {"hours", UNITS, DTK_HOUR}, /* "hours" relative */
188  {"hr", UNITS, DTK_HOUR}, /* "hour" relative */
189  {"hrs", UNITS, DTK_HOUR}, /* "hours" relative */
190  {"m", UNITS, DTK_MINUTE}, /* "minute" relative */
191  {"microsecon", UNITS, DTK_MICROSEC}, /* "microsecond" relative */
192  {"mil", UNITS, DTK_MILLENNIUM}, /* "millennium" relative */
193  {"millennia", UNITS, DTK_MILLENNIUM}, /* "millennia" relative */
194  {DMILLENNIUM, UNITS, DTK_MILLENNIUM}, /* "millennium" relative */
195  {"millisecon", UNITS, DTK_MILLISEC}, /* relative */
196  {"mils", UNITS, DTK_MILLENNIUM}, /* "millennia" relative */
197  {"min", UNITS, DTK_MINUTE}, /* "minute" relative */
198  {"mins", UNITS, DTK_MINUTE}, /* "minutes" relative */
199  {DMINUTE, UNITS, DTK_MINUTE}, /* "minute" relative */
200  {"minutes", UNITS, DTK_MINUTE}, /* "minutes" relative */
201  {"mon", UNITS, DTK_MONTH}, /* "months" relative */
202  {"mons", UNITS, DTK_MONTH}, /* "months" relative */
203  {DMONTH, UNITS, DTK_MONTH}, /* "month" relative */
204  {"months", UNITS, DTK_MONTH},
205  {"ms", UNITS, DTK_MILLISEC},
206  {"msec", UNITS, DTK_MILLISEC},
207  {DMILLISEC, UNITS, DTK_MILLISEC},
208  {"mseconds", UNITS, DTK_MILLISEC},
209  {"msecs", UNITS, DTK_MILLISEC},
210  {"qtr", UNITS, DTK_QUARTER}, /* "quarter" relative */
211  {DQUARTER, UNITS, DTK_QUARTER}, /* "quarter" relative */
212  {"s", UNITS, DTK_SECOND},
213  {"sec", UNITS, DTK_SECOND},
214  {DSECOND, UNITS, DTK_SECOND},
215  {"seconds", UNITS, DTK_SECOND},
216  {"secs", UNITS, DTK_SECOND},
217  {DTIMEZONE, UNITS, DTK_TZ}, /* "timezone" time offset */
218  {"timezone_h", UNITS, DTK_TZ_HOUR}, /* timezone hour units */
219  {"timezone_m", UNITS, DTK_TZ_MINUTE}, /* timezone minutes units */
220  {"us", UNITS, DTK_MICROSEC}, /* "microsecond" relative */
221  {"usec", UNITS, DTK_MICROSEC}, /* "microsecond" relative */
222  {DMICROSEC, UNITS, DTK_MICROSEC}, /* "microsecond" relative */
223  {"useconds", UNITS, DTK_MICROSEC}, /* "microseconds" relative */
224  {"usecs", UNITS, DTK_MICROSEC}, /* "microseconds" relative */
225  {"w", UNITS, DTK_WEEK}, /* "week" relative */
226  {DWEEK, UNITS, DTK_WEEK}, /* "week" relative */
227  {"weeks", UNITS, DTK_WEEK}, /* "weeks" relative */
228  {"y", UNITS, DTK_YEAR}, /* "year" relative */
229  {DYEAR, UNITS, DTK_YEAR}, /* "year" relative */
230  {"years", UNITS, DTK_YEAR}, /* "years" relative */
231  {"yr", UNITS, DTK_YEAR}, /* "year" relative */
232  {"yrs", UNITS, DTK_YEAR} /* "years" relative */
233 };
234 
235 static const int szdeltatktbl = sizeof deltatktbl / sizeof deltatktbl[0];
236 
237 static TimeZoneAbbrevTable *zoneabbrevtbl = NULL;
238 
239 /* Caches of recent lookup results in the above tables */
240 
241 static const datetkn *datecache[MAXDATEFIELDS] = {NULL};
242 
243 static const datetkn *deltacache[MAXDATEFIELDS] = {NULL};
244 
245 static const datetkn *abbrevcache[MAXDATEFIELDS] = {NULL};
246 
247 
248 /*
249  * Calendar time to Julian date conversions.
250  * Julian date is commonly used in astronomical applications,
251  * since it is numerically accurate and computationally simple.
252  * The algorithms here will accurately convert between Julian day
253  * and calendar date for all non-negative Julian days
254  * (i.e. from Nov 24, -4713 on).
255  *
256  * Rewritten to eliminate overflow problems. This now allows the
257  * routines to work correctly for all Julian day counts from
258  * 0 to 2147483647 (Nov 24, -4713 to Jun 3, 5874898) assuming
259  * a 32-bit integer. Longer types should also work to the limits
260  * of their precision.
261  *
262  * Actually, date2j() will work sanely, in the sense of producing
263  * valid negative Julian dates, significantly before Nov 24, -4713.
264  * We rely on it to do so back to Nov 1, -4713; see IS_VALID_JULIAN()
265  * and associated commentary in timestamp.h.
266  */
267 
268 int
269 date2j(int y, int m, int d)
270 {
271  int julian;
272  int century;
273 
274  if (m > 2)
275  {
276  m += 1;
277  y += 4800;
278  }
279  else
280  {
281  m += 13;
282  y += 4799;
283  }
284 
285  century = y / 100;
286  julian = y * 365 - 32167;
287  julian += y / 4 - century + century / 4;
288  julian += 7834 * m / 256 + d;
289 
290  return julian;
291 } /* date2j() */
292 
293 void
294 j2date(int jd, int *year, int *month, int *day)
295 {
296  unsigned int julian;
297  unsigned int quad;
298  unsigned int extra;
299  int y;
300 
301  julian = jd;
302  julian += 32044;
303  quad = julian / 146097;
304  extra = (julian - quad * 146097) * 4 + 3;
305  julian += 60 + quad * 3 + extra / 146097;
306  quad = julian / 1461;
307  julian -= quad * 1461;
308  y = julian * 4 / 1461;
309  julian = ((y != 0) ? ((julian + 305) % 365) : ((julian + 306) % 366))
310  + 123;
311  y += quad * 4;
312  *year = y - 4800;
313  quad = julian * 2141 / 65536;
314  *day = julian - 7834 * quad / 256;
315  *month = (quad + 10) % MONTHS_PER_YEAR + 1;
316 } /* j2date() */
317 
318 
319 /*
320  * j2day - convert Julian date to day-of-week (0..6 == Sun..Sat)
321  *
322  * Note: various places use the locution j2day(date - 1) to produce a
323  * result according to the convention 0..6 = Mon..Sun. This is a bit of
324  * a crock, but will work as long as the computation here is just a modulo.
325  */
326 int
327 j2day(int date)
328 {
329  date += 1;
330  date %= 7;
331  /* Cope if division truncates towards zero, as it probably does */
332  if (date < 0)
333  date += 7;
334 
335  return date;
336 } /* j2day() */
337 
338 
339 /*
340  * GetCurrentDateTime()
341  *
342  * Get the transaction start time ("now()") broken down as a struct pg_tm.
343  */
344 void
345 GetCurrentDateTime(struct pg_tm *tm)
346 {
347  int tz;
348  fsec_t fsec;
349 
350  timestamp2tm(GetCurrentTransactionStartTimestamp(), &tz, tm, &fsec,
351  NULL, NULL);
352  /* Note: don't pass NULL tzp to timestamp2tm; affects behavior */
353 }
354 
355 /*
356  * GetCurrentTimeUsec()
357  *
358  * Get the transaction start time ("now()") broken down as a struct pg_tm,
359  * including fractional seconds and timezone offset.
360  */
361 void
362 GetCurrentTimeUsec(struct pg_tm *tm, fsec_t *fsec, int *tzp)
363 {
364  int tz;
365 
366  timestamp2tm(GetCurrentTransactionStartTimestamp(), &tz, tm, fsec,
367  NULL, NULL);
368  /* Note: don't pass NULL tzp to timestamp2tm; affects behavior */
369  if (tzp != NULL)
370  *tzp = tz;
371 }
372 
373 
374 /*
375  * Append seconds and fractional seconds (if any) at *cp.
376  *
377  * precision is the max number of fraction digits, fillzeros says to
378  * pad to two integral-seconds digits.
379  *
380  * Returns a pointer to the new end of string. No NUL terminator is put
381  * there; callers are responsible for NUL terminating str themselves.
382  *
383  * Note that any sign is stripped from the input seconds values.
384  */
385 static char *
386 AppendSeconds(char *cp, int sec, fsec_t fsec, int precision, bool fillzeros)
387 {
388  Assert(precision >= 0);
389 
390  if (fillzeros)
391  cp = pg_ltostr_zeropad(cp, Abs(sec), 2);
392  else
393  cp = pg_ltostr(cp, Abs(sec));
394 
395  /* fsec_t is just an int32 */
396  if (fsec != 0)
397  {
398  int32 value = Abs(fsec);
399  char *end = &cp[precision + 1];
400  bool gotnonzero = false;
401 
402  *cp++ = '.';
403 
404  /*
405  * Append the fractional seconds part. Note that we don't want any
406  * trailing zeros here, so since we're building the number in reverse
407  * we'll skip appending zeros until we've output a non-zero digit.
408  */
409  while (precision--)
410  {
411  int32 oldval = value;
412  int32 remainder;
413 
414  value /= 10;
415  remainder = oldval - value * 10;
416 
417  /* check if we got a non-zero */
418  if (remainder)
419  gotnonzero = true;
420 
421  if (gotnonzero)
422  cp[precision] = '0' + remainder;
423  else
424  end = &cp[precision];
425  }
426 
427  /*
428  * If we still have a non-zero value then precision must have not been
429  * enough to print the number. We punt the problem to pg_ltostr(),
430  * which will generate a correct answer in the minimum valid width.
431  */
432  if (value)
433  return pg_ltostr(cp, Abs(fsec));
434 
435  return end;
436  }
437  else
438  return cp;
439 }
440 
441 
442 /*
443  * Variant of above that's specialized to timestamp case.
444  *
445  * Returns a pointer to the new end of string. No NUL terminator is put
446  * there; callers are responsible for NUL terminating str themselves.
447  */
448 static char *
449 AppendTimestampSeconds(char *cp, struct pg_tm *tm, fsec_t fsec)
450 {
451  return AppendSeconds(cp, tm->tm_sec, fsec, MAX_TIMESTAMP_PRECISION, true);
452 }
453 
454 /*
455  * Multiply frac by scale (to produce seconds) and add to *tm & *fsec.
456  * We assume the input frac is less than 1 so overflow is not an issue.
457  */
458 static void
459 AdjustFractSeconds(double frac, struct pg_tm *tm, fsec_t *fsec, int scale)
460 {
461  int sec;
462 
463  if (frac == 0)
464  return;
465  frac *= scale;
466  sec = (int) frac;
467  tm->tm_sec += sec;
468  frac -= sec;
469  *fsec += rint(frac * 1000000);
470 }
471 
472 /* As above, but initial scale produces days */
473 static void
474 AdjustFractDays(double frac, struct pg_tm *tm, fsec_t *fsec, int scale)
475 {
476  int extra_days;
477 
478  if (frac == 0)
479  return;
480  frac *= scale;
481  extra_days = (int) frac;
482  tm->tm_mday += extra_days;
483  frac -= extra_days;
484  AdjustFractSeconds(frac, tm, fsec, SECS_PER_DAY);
485 }
486 
487 /* Fetch a fractional-second value with suitable error checking */
488 static int
489 ParseFractionalSecond(char *cp, fsec_t *fsec)
490 {
491  double frac;
492 
493  /* Caller should always pass the start of the fraction part */
494  Assert(*cp == '.');
495  errno = 0;
496  frac = strtod(cp, &cp);
497  /* check for parse failure */
498  if (*cp != '\0' || errno != 0)
499  return DTERR_BAD_FORMAT;
500  *fsec = rint(frac * 1000000);
501  return 0;
502 }
503 
504 
505 /* ParseDateTime()
506  * Break string into tokens based on a date/time context.
507  * Returns 0 if successful, DTERR code if bogus input detected.
508  *
509  * timestr - the input string
510  * workbuf - workspace for field string storage. This must be
511  * larger than the largest legal input for this datetime type --
512  * some additional space will be needed to NUL terminate fields.
513  * buflen - the size of workbuf
514  * field[] - pointers to field strings are returned in this array
515  * ftype[] - field type indicators are returned in this array
516  * maxfields - dimensions of the above two arrays
517  * *numfields - set to the actual number of fields detected
518  *
519  * The fields extracted from the input are stored as separate,
520  * null-terminated strings in the workspace at workbuf. Any text is
521  * converted to lower case.
522  *
523  * Several field types are assigned:
524  * DTK_NUMBER - digits and (possibly) a decimal point
525  * DTK_DATE - digits and two delimiters, or digits and text
526  * DTK_TIME - digits, colon delimiters, and possibly a decimal point
527  * DTK_STRING - text (no digits or punctuation)
528  * DTK_SPECIAL - leading "+" or "-" followed by text
529  * DTK_TZ - leading "+" or "-" followed by digits (also eats ':', '.', '-')
530  *
531  * Note that some field types can hold unexpected items:
532  * DTK_NUMBER can hold date fields (yy.ddd)
533  * DTK_STRING can hold months (January) and time zones (PST)
534  * DTK_DATE can hold time zone names (America/New_York, GMT-8)
535  */
536 int
537 ParseDateTime(const char *timestr, char *workbuf, size_t buflen,
538  char **field, int *ftype, int maxfields, int *numfields)
539 {
540  int nf = 0;
541  const char *cp = timestr;
542  char *bufp = workbuf;
543  const char *bufend = workbuf + buflen;
544 
545  /*
546  * Set the character pointed-to by "bufptr" to "newchar", and increment
547  * "bufptr". "end" gives the end of the buffer -- we return an error if
548  * there is no space left to append a character to the buffer. Note that
549  * "bufptr" is evaluated twice.
550  */
551 #define APPEND_CHAR(bufptr, end, newchar) \
552  do \
553  { \
554  if (((bufptr) + 1) >= (end)) \
555  return DTERR_BAD_FORMAT; \
556  *(bufptr)++ = newchar; \
557  } while (0)
558 
559  /* outer loop through fields */
560  while (*cp != '\0')
561  {
562  /* Ignore spaces between fields */
563  if (isspace((unsigned char) *cp))
564  {
565  cp++;
566  continue;
567  }
568 
569  /* Record start of current field */
570  if (nf >= maxfields)
571  return DTERR_BAD_FORMAT;
572  field[nf] = bufp;
573 
574  /* leading digit? then date or time */
575  if (isdigit((unsigned char) *cp))
576  {
577  APPEND_CHAR(bufp, bufend, *cp++);
578  while (isdigit((unsigned char) *cp))
579  APPEND_CHAR(bufp, bufend, *cp++);
580 
581  /* time field? */
582  if (*cp == ':')
583  {
584  ftype[nf] = DTK_TIME;
585  APPEND_CHAR(bufp, bufend, *cp++);
586  while (isdigit((unsigned char) *cp) ||
587  (*cp == ':') || (*cp == '.'))
588  APPEND_CHAR(bufp, bufend, *cp++);
589  }
590  /* date field? allow embedded text month */
591  else if (*cp == '-' || *cp == '/' || *cp == '.')
592  {
593  /* save delimiting character to use later */
594  char delim = *cp;
595 
596  APPEND_CHAR(bufp, bufend, *cp++);
597  /* second field is all digits? then no embedded text month */
598  if (isdigit((unsigned char) *cp))
599  {
600  ftype[nf] = ((delim == '.') ? DTK_NUMBER : DTK_DATE);
601  while (isdigit((unsigned char) *cp))
602  APPEND_CHAR(bufp, bufend, *cp++);
603 
604  /*
605  * insist that the delimiters match to get a three-field
606  * date.
607  */
608  if (*cp == delim)
609  {
610  ftype[nf] = DTK_DATE;
611  APPEND_CHAR(bufp, bufend, *cp++);
612  while (isdigit((unsigned char) *cp) || *cp == delim)
613  APPEND_CHAR(bufp, bufend, *cp++);
614  }
615  }
616  else
617  {
618  ftype[nf] = DTK_DATE;
619  while (isalnum((unsigned char) *cp) || *cp == delim)
620  APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char) *cp++));
621  }
622  }
623 
624  /*
625  * otherwise, number only and will determine year, month, day, or
626  * concatenated fields later...
627  */
628  else
629  ftype[nf] = DTK_NUMBER;
630  }
631  /* Leading decimal point? Then fractional seconds... */
632  else if (*cp == '.')
633  {
634  APPEND_CHAR(bufp, bufend, *cp++);
635  while (isdigit((unsigned char) *cp))
636  APPEND_CHAR(bufp, bufend, *cp++);
637 
638  ftype[nf] = DTK_NUMBER;
639  }
640 
641  /*
642  * text? then date string, month, day of week, special, or timezone
643  */
644  else if (isalpha((unsigned char) *cp))
645  {
646  bool is_date;
647 
648  ftype[nf] = DTK_STRING;
649  APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char) *cp++));
650  while (isalpha((unsigned char) *cp))
651  APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char) *cp++));
652 
653  /*
654  * Dates can have embedded '-', '/', or '.' separators. It could
655  * also be a timezone name containing embedded '/', '+', '-', '_',
656  * or ':' (but '_' or ':' can't be the first punctuation). If the
657  * next character is a digit or '+', we need to check whether what
658  * we have so far is a recognized non-timezone keyword --- if so,
659  * don't believe that this is the start of a timezone.
660  */
661  is_date = false;
662  if (*cp == '-' || *cp == '/' || *cp == '.')
663  is_date = true;
664  else if (*cp == '+' || isdigit((unsigned char) *cp))
665  {
666  *bufp = '\0'; /* null-terminate current field value */
667  /* we need search only the core token table, not TZ names */
668  if (datebsearch(field[nf], datetktbl, szdatetktbl) == NULL)
669  is_date = true;
670  }
671  if (is_date)
672  {
673  ftype[nf] = DTK_DATE;
674  do
675  {
676  APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char) *cp++));
677  } while (*cp == '+' || *cp == '-' ||
678  *cp == '/' || *cp == '_' ||
679  *cp == '.' || *cp == ':' ||
680  isalnum((unsigned char) *cp));
681  }
682  }
683  /* sign? then special or numeric timezone */
684  else if (*cp == '+' || *cp == '-')
685  {
686  APPEND_CHAR(bufp, bufend, *cp++);
687  /* soak up leading whitespace */
688  while (isspace((unsigned char) *cp))
689  cp++;
690  /* numeric timezone? */
691  /* note that "DTK_TZ" could also be a signed float or yyyy-mm */
692  if (isdigit((unsigned char) *cp))
693  {
694  ftype[nf] = DTK_TZ;
695  APPEND_CHAR(bufp, bufend, *cp++);
696  while (isdigit((unsigned char) *cp) ||
697  *cp == ':' || *cp == '.' || *cp == '-')
698  APPEND_CHAR(bufp, bufend, *cp++);
699  }
700  /* special? */
701  else if (isalpha((unsigned char) *cp))
702  {
703  ftype[nf] = DTK_SPECIAL;
704  APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char) *cp++));
705  while (isalpha((unsigned char) *cp))
706  APPEND_CHAR(bufp, bufend, pg_tolower((unsigned char) *cp++));
707  }
708  /* otherwise something wrong... */
709  else
710  return DTERR_BAD_FORMAT;
711  }
712  /* ignore other punctuation but use as delimiter */
713  else if (ispunct((unsigned char) *cp))
714  {
715  cp++;
716  continue;
717  }
718  /* otherwise, something is not right... */
719  else
720  return DTERR_BAD_FORMAT;
721 
722  /* force in a delimiter after each field */
723  *bufp++ = '\0';
724  nf++;
725  }
726 
727  *numfields = nf;
728 
729  return 0;
730 }
731 
732 
733 /* DecodeDateTime()
734  * Interpret previously parsed fields for general date and time.
735  * Return 0 if full date, 1 if only time, and negative DTERR code if problems.
736  * (Currently, all callers treat 1 as an error return too.)
737  *
738  * External format(s):
739  * "<weekday> <month>-<day>-<year> <hour>:<minute>:<second>"
740  * "Fri Feb-7-1997 15:23:27"
741  * "Feb-7-1997 15:23:27"
742  * "2-7-1997 15:23:27"
743  * "1997-2-7 15:23:27"
744  * "1997.038 15:23:27" (day of year 1-366)
745  * Also supports input in compact time:
746  * "970207 152327"
747  * "97038 152327"
748  * "20011225T040506.789-07"
749  *
750  * Use the system-provided functions to get the current time zone
751  * if not specified in the input string.
752  *
753  * If the date is outside the range of pg_time_t (in practice that could only
754  * happen if pg_time_t is just 32 bits), then assume UTC time zone - thomas
755  * 1997-05-27
756  */
757 int
758 DecodeDateTime(char **field, int *ftype, int nf,
759  int *dtype, struct pg_tm *tm, fsec_t *fsec, int *tzp)
760 {
761  int fmask = 0,
762  tmask,
763  type;
764  int ptype = 0; /* "prefix type" for ISO y2001m02d04 format */
765  int i;
766  int val;
767  int dterr;
768  int mer = HR24;
769  bool haveTextMonth = false;
770  bool isjulian = false;
771  bool is2digits = false;
772  bool bc = false;
773  pg_tz *namedTz = NULL;
774  pg_tz *abbrevTz = NULL;
775  pg_tz *valtz;
776  char *abbrev = NULL;
777  struct pg_tm cur_tm;
778 
779  /*
780  * We'll insist on at least all of the date fields, but initialize the
781  * remaining fields in case they are not set later...
782  */
783  *dtype = DTK_DATE;
784  tm->tm_hour = 0;
785  tm->tm_min = 0;
786  tm->tm_sec = 0;
787  *fsec = 0;
788  /* don't know daylight savings time status apriori */
789  tm->tm_isdst = -1;
790  if (tzp != NULL)
791  *tzp = 0;
792 
793  for (i = 0; i < nf; i++)
794  {
795  switch (ftype[i])
796  {
797  case DTK_DATE:
798 
799  /*
800  * Integral julian day with attached time zone? All other
801  * forms with JD will be separated into distinct fields, so we
802  * handle just this case here.
803  */
804  if (ptype == DTK_JULIAN)
805  {
806  char *cp;
807  int val;
808 
809  if (tzp == NULL)
810  return DTERR_BAD_FORMAT;
811 
812  errno = 0;
813  val = strtoint(field[i], &cp, 10);
814  if (errno == ERANGE || val < 0)
815  return DTERR_FIELD_OVERFLOW;
816 
817  j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
818  isjulian = true;
819 
820  /* Get the time zone from the end of the string */
821  dterr = DecodeTimezone(cp, tzp);
822  if (dterr)
823  return dterr;
824 
825  tmask = DTK_DATE_M | DTK_TIME_M | DTK_M(TZ);
826  ptype = 0;
827  break;
828  }
829 
830  /*
831  * Already have a date? Then this might be a time zone name
832  * with embedded punctuation (e.g. "America/New_York") or a
833  * run-together time with trailing time zone (e.g. hhmmss-zz).
834  * - thomas 2001-12-25
835  *
836  * We consider it a time zone if we already have month & day.
837  * This is to allow the form "mmm dd hhmmss tz year", which
838  * we've historically accepted.
839  */
840  else if (ptype != 0 ||
841  ((fmask & (DTK_M(MONTH) | DTK_M(DAY))) ==
842  (DTK_M(MONTH) | DTK_M(DAY))))
843  {
844  /* No time zone accepted? Then quit... */
845  if (tzp == NULL)
846  return DTERR_BAD_FORMAT;
847 
848  if (isdigit((unsigned char) *field[i]) || ptype != 0)
849  {
850  char *cp;
851 
852  if (ptype != 0)
853  {
854  /* Sanity check; should not fail this test */
855  if (ptype != DTK_TIME)
856  return DTERR_BAD_FORMAT;
857  ptype = 0;
858  }
859 
860  /*
861  * Starts with a digit but we already have a time
862  * field? Then we are in trouble with a date and time
863  * already...
864  */
865  if ((fmask & DTK_TIME_M) == DTK_TIME_M)
866  return DTERR_BAD_FORMAT;
867 
868  if ((cp = strchr(field[i], '-')) == NULL)
869  return DTERR_BAD_FORMAT;
870 
871  /* Get the time zone from the end of the string */
872  dterr = DecodeTimezone(cp, tzp);
873  if (dterr)
874  return dterr;
875  *cp = '\0';
876 
877  /*
878  * Then read the rest of the field as a concatenated
879  * time
880  */
881  dterr = DecodeNumberField(strlen(field[i]), field[i],
882  fmask,
883  &tmask, tm,
884  fsec, &is2digits);
885  if (dterr < 0)
886  return dterr;
887 
888  /*
889  * modify tmask after returning from
890  * DecodeNumberField()
891  */
892  tmask |= DTK_M(TZ);
893  }
894  else
895  {
896  namedTz = pg_tzset(field[i]);
897  if (!namedTz)
898  {
899  /*
900  * We should return an error code instead of
901  * ereport'ing directly, but then there is no way
902  * to report the bad time zone name.
903  */
904  ereport(ERROR,
905  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
906  errmsg("time zone \"%s\" not recognized",
907  field[i])));
908  }
909  /* we'll apply the zone setting below */
910  tmask = DTK_M(TZ);
911  }
912  }
913  else
914  {
915  dterr = DecodeDate(field[i], fmask,
916  &tmask, &is2digits, tm);
917  if (dterr)
918  return dterr;
919  }
920  break;
921 
922  case DTK_TIME:
923 
924  /*
925  * This might be an ISO time following a "t" field.
926  */
927  if (ptype != 0)
928  {
929  /* Sanity check; should not fail this test */
930  if (ptype != DTK_TIME)
931  return DTERR_BAD_FORMAT;
932  ptype = 0;
933  }
934  dterr = DecodeTime(field[i], fmask, INTERVAL_FULL_RANGE,
935  &tmask, tm, fsec);
936  if (dterr)
937  return dterr;
938 
939  /*
940  * Check upper limit on hours; other limits checked in
941  * DecodeTime()
942  */
943  /* test for > 24:00:00 */
944  if (tm->tm_hour > HOURS_PER_DAY ||
945  (tm->tm_hour == HOURS_PER_DAY &&
946  (tm->tm_min > 0 || tm->tm_sec > 0 || *fsec > 0)))
947  return DTERR_FIELD_OVERFLOW;
948  break;
949 
950  case DTK_TZ:
951  {
952  int tz;
953 
954  if (tzp == NULL)
955  return DTERR_BAD_FORMAT;
956 
957  dterr = DecodeTimezone(field[i], &tz);
958  if (dterr)
959  return dterr;
960  *tzp = tz;
961  tmask = DTK_M(TZ);
962  }
963  break;
964 
965  case DTK_NUMBER:
966 
967  /*
968  * Was this an "ISO date" with embedded field labels? An
969  * example is "y2001m02d04" - thomas 2001-02-04
970  */
971  if (ptype != 0)
972  {
973  char *cp;
974  int val;
975 
976  errno = 0;
977  val = strtoint(field[i], &cp, 10);
978  if (errno == ERANGE)
979  return DTERR_FIELD_OVERFLOW;
980 
981  /*
982  * only a few kinds are allowed to have an embedded
983  * decimal
984  */
985  if (*cp == '.')
986  switch (ptype)
987  {
988  case DTK_JULIAN:
989  case DTK_TIME:
990  case DTK_SECOND:
991  break;
992  default:
993  return DTERR_BAD_FORMAT;
994  break;
995  }
996  else if (*cp != '\0')
997  return DTERR_BAD_FORMAT;
998 
999  switch (ptype)
1000  {
1001  case DTK_YEAR:
1002  tm->tm_year = val;
1003  tmask = DTK_M(YEAR);
1004  break;
1005 
1006  case DTK_MONTH:
1007 
1008  /*
1009  * already have a month and hour? then assume
1010  * minutes
1011  */
1012  if ((fmask & DTK_M(MONTH)) != 0 &&
1013  (fmask & DTK_M(HOUR)) != 0)
1014  {
1015  tm->tm_min = val;
1016  tmask = DTK_M(MINUTE);
1017  }
1018  else
1019  {
1020  tm->tm_mon = val;
1021  tmask = DTK_M(MONTH);
1022  }
1023  break;
1024 
1025  case DTK_DAY:
1026  tm->tm_mday = val;
1027  tmask = DTK_M(DAY);
1028  break;
1029 
1030  case DTK_HOUR:
1031  tm->tm_hour = val;
1032  tmask = DTK_M(HOUR);
1033  break;
1034 
1035  case DTK_MINUTE:
1036  tm->tm_min = val;
1037  tmask = DTK_M(MINUTE);
1038  break;
1039 
1040  case DTK_SECOND:
1041  tm->tm_sec = val;
1042  tmask = DTK_M(SECOND);
1043  if (*cp == '.')
1044  {
1045  dterr = ParseFractionalSecond(cp, fsec);
1046  if (dterr)
1047  return dterr;
1048  tmask = DTK_ALL_SECS_M;
1049  }
1050  break;
1051 
1052  case DTK_TZ:
1053  tmask = DTK_M(TZ);
1054  dterr = DecodeTimezone(field[i], tzp);
1055  if (dterr)
1056  return dterr;
1057  break;
1058 
1059  case DTK_JULIAN:
1060  /* previous field was a label for "julian date" */
1061  if (val < 0)
1062  return DTERR_FIELD_OVERFLOW;
1063  tmask = DTK_DATE_M;
1064  j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
1065  isjulian = true;
1066 
1067  /* fractional Julian Day? */
1068  if (*cp == '.')
1069  {
1070  double time;
1071 
1072  errno = 0;
1073  time = strtod(cp, &cp);
1074  if (*cp != '\0' || errno != 0)
1075  return DTERR_BAD_FORMAT;
1076  time *= USECS_PER_DAY;
1077  dt2time(time,
1078  &tm->tm_hour, &tm->tm_min,
1079  &tm->tm_sec, fsec);
1080  tmask |= DTK_TIME_M;
1081  }
1082  break;
1083 
1084  case DTK_TIME:
1085  /* previous field was "t" for ISO time */
1086  dterr = DecodeNumberField(strlen(field[i]), field[i],
1087  (fmask | DTK_DATE_M),
1088  &tmask, tm,
1089  fsec, &is2digits);
1090  if (dterr < 0)
1091  return dterr;
1092  if (tmask != DTK_TIME_M)
1093  return DTERR_BAD_FORMAT;
1094  break;
1095 
1096  default:
1097  return DTERR_BAD_FORMAT;
1098  break;
1099  }
1100 
1101  ptype = 0;
1102  *dtype = DTK_DATE;
1103  }
1104  else
1105  {
1106  char *cp;
1107  int flen;
1108 
1109  flen = strlen(field[i]);
1110  cp = strchr(field[i], '.');
1111 
1112  /* Embedded decimal and no date yet? */
1113  if (cp != NULL && !(fmask & DTK_DATE_M))
1114  {
1115  dterr = DecodeDate(field[i], fmask,
1116  &tmask, &is2digits, tm);
1117  if (dterr)
1118  return dterr;
1119  }
1120  /* embedded decimal and several digits before? */
1121  else if (cp != NULL && flen - strlen(cp) > 2)
1122  {
1123  /*
1124  * Interpret as a concatenated date or time Set the
1125  * type field to allow decoding other fields later.
1126  * Example: 20011223 or 040506
1127  */
1128  dterr = DecodeNumberField(flen, field[i], fmask,
1129  &tmask, tm,
1130  fsec, &is2digits);
1131  if (dterr < 0)
1132  return dterr;
1133  }
1134 
1135  /*
1136  * Is this a YMD or HMS specification, or a year number?
1137  * YMD and HMS are required to be six digits or more, so
1138  * if it is 5 digits, it is a year. If it is six or more
1139  * digits, we assume it is YMD or HMS unless no date and
1140  * no time values have been specified. This forces 6+
1141  * digit years to be at the end of the string, or to use
1142  * the ISO date specification.
1143  */
1144  else if (flen >= 6 && (!(fmask & DTK_DATE_M) ||
1145  !(fmask & DTK_TIME_M)))
1146  {
1147  dterr = DecodeNumberField(flen, field[i], fmask,
1148  &tmask, tm,
1149  fsec, &is2digits);
1150  if (dterr < 0)
1151  return dterr;
1152  }
1153  /* otherwise it is a single date/time field... */
1154  else
1155  {
1156  dterr = DecodeNumber(flen, field[i],
1157  haveTextMonth, fmask,
1158  &tmask, tm,
1159  fsec, &is2digits);
1160  if (dterr)
1161  return dterr;
1162  }
1163  }
1164  break;
1165 
1166  case DTK_STRING:
1167  case DTK_SPECIAL:
1168  /* timezone abbrevs take precedence over built-in tokens */
1169  type = DecodeTimezoneAbbrev(i, field[i], &val, &valtz);
1170  if (type == UNKNOWN_FIELD)
1171  type = DecodeSpecial(i, field[i], &val);
1172  if (type == IGNORE_DTF)
1173  continue;
1174 
1175  tmask = DTK_M(type);
1176  switch (type)
1177  {
1178  case RESERV:
1179  switch (val)
1180  {
1181  case DTK_NOW:
1182  tmask = (DTK_DATE_M | DTK_TIME_M | DTK_M(TZ));
1183  *dtype = DTK_DATE;
1184  GetCurrentTimeUsec(tm, fsec, tzp);
1185  break;
1186 
1187  case DTK_YESTERDAY:
1188  tmask = DTK_DATE_M;
1189  *dtype = DTK_DATE;
1190  GetCurrentDateTime(&cur_tm);
1191  j2date(date2j(cur_tm.tm_year, cur_tm.tm_mon, cur_tm.tm_mday) - 1,
1192  &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
1193  break;
1194 
1195  case DTK_TODAY:
1196  tmask = DTK_DATE_M;
1197  *dtype = DTK_DATE;
1198  GetCurrentDateTime(&cur_tm);
1199  tm->tm_year = cur_tm.tm_year;
1200  tm->tm_mon = cur_tm.tm_mon;
1201  tm->tm_mday = cur_tm.tm_mday;
1202  break;
1203 
1204  case DTK_TOMORROW:
1205  tmask = DTK_DATE_M;
1206  *dtype = DTK_DATE;
1207  GetCurrentDateTime(&cur_tm);
1208  j2date(date2j(cur_tm.tm_year, cur_tm.tm_mon, cur_tm.tm_mday) + 1,
1209  &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
1210  break;
1211 
1212  case DTK_ZULU:
1213  tmask = (DTK_TIME_M | DTK_M(TZ));
1214  *dtype = DTK_DATE;
1215  tm->tm_hour = 0;
1216  tm->tm_min = 0;
1217  tm->tm_sec = 0;
1218  if (tzp != NULL)
1219  *tzp = 0;
1220  break;
1221 
1222  default:
1223  *dtype = val;
1224  }
1225 
1226  break;
1227 
1228  case MONTH:
1229 
1230  /*
1231  * already have a (numeric) month? then see if we can
1232  * substitute...
1233  */
1234  if ((fmask & DTK_M(MONTH)) && !haveTextMonth &&
1235  !(fmask & DTK_M(DAY)) && tm->tm_mon >= 1 &&
1236  tm->tm_mon <= 31)
1237  {
1238  tm->tm_mday = tm->tm_mon;
1239  tmask = DTK_M(DAY);
1240  }
1241  haveTextMonth = true;
1242  tm->tm_mon = val;
1243  break;
1244 
1245  case DTZMOD:
1246 
1247  /*
1248  * daylight savings time modifier (solves "MET DST"
1249  * syntax)
1250  */
1251  tmask |= DTK_M(DTZ);
1252  tm->tm_isdst = 1;
1253  if (tzp == NULL)
1254  return DTERR_BAD_FORMAT;
1255  *tzp -= val;
1256  break;
1257 
1258  case DTZ:
1259 
1260  /*
1261  * set mask for TZ here _or_ check for DTZ later when
1262  * getting default timezone
1263  */
1264  tmask |= DTK_M(TZ);
1265  tm->tm_isdst = 1;
1266  if (tzp == NULL)
1267  return DTERR_BAD_FORMAT;
1268  *tzp = -val;
1269  break;
1270 
1271  case TZ:
1272  tm->tm_isdst = 0;
1273  if (tzp == NULL)
1274  return DTERR_BAD_FORMAT;
1275  *tzp = -val;
1276  break;
1277 
1278  case DYNTZ:
1279  tmask |= DTK_M(TZ);
1280  if (tzp == NULL)
1281  return DTERR_BAD_FORMAT;
1282  /* we'll determine the actual offset later */
1283  abbrevTz = valtz;
1284  abbrev = field[i];
1285  break;
1286 
1287  case AMPM:
1288  mer = val;
1289  break;
1290 
1291  case ADBC:
1292  bc = (val == BC);
1293  break;
1294 
1295  case DOW:
1296  tm->tm_wday = val;
1297  break;
1298 
1299  case UNITS:
1300  tmask = 0;
1301  ptype = val;
1302  break;
1303 
1304  case ISOTIME:
1305 
1306  /*
1307  * This is a filler field "t" indicating that the next
1308  * field is time. Try to verify that this is sensible.
1309  */
1310  tmask = 0;
1311 
1312  /* No preceding date? Then quit... */
1313  if ((fmask & DTK_DATE_M) != DTK_DATE_M)
1314  return DTERR_BAD_FORMAT;
1315 
1316  /***
1317  * We will need one of the following fields:
1318  * DTK_NUMBER should be hhmmss.fff
1319  * DTK_TIME should be hh:mm:ss.fff
1320  * DTK_DATE should be hhmmss-zz
1321  ***/
1322  if (i >= nf - 1 ||
1323  (ftype[i + 1] != DTK_NUMBER &&
1324  ftype[i + 1] != DTK_TIME &&
1325  ftype[i + 1] != DTK_DATE))
1326  return DTERR_BAD_FORMAT;
1327 
1328  ptype = val;
1329  break;
1330 
1331  case UNKNOWN_FIELD:
1332 
1333  /*
1334  * Before giving up and declaring error, check to see
1335  * if it is an all-alpha timezone name.
1336  */
1337  namedTz = pg_tzset(field[i]);
1338  if (!namedTz)
1339  return DTERR_BAD_FORMAT;
1340  /* we'll apply the zone setting below */
1341  tmask = DTK_M(TZ);
1342  break;
1343 
1344  default:
1345  return DTERR_BAD_FORMAT;
1346  }
1347  break;
1348 
1349  default:
1350  return DTERR_BAD_FORMAT;
1351  }
1352 
1353  if (tmask & fmask)
1354  return DTERR_BAD_FORMAT;
1355  fmask |= tmask;
1356  } /* end loop over fields */
1357 
1358  /* do final checking/adjustment of Y/M/D fields */
1359  dterr = ValidateDate(fmask, isjulian, is2digits, bc, tm);
1360  if (dterr)
1361  return dterr;
1362 
1363  /* handle AM/PM */
1364  if (mer != HR24 && tm->tm_hour > HOURS_PER_DAY / 2)
1365  return DTERR_FIELD_OVERFLOW;
1366  if (mer == AM && tm->tm_hour == HOURS_PER_DAY / 2)
1367  tm->tm_hour = 0;
1368  else if (mer == PM && tm->tm_hour != HOURS_PER_DAY / 2)
1369  tm->tm_hour += HOURS_PER_DAY / 2;
1370 
1371  /* do additional checking for full date specs... */
1372  if (*dtype == DTK_DATE)
1373  {
1374  if ((fmask & DTK_DATE_M) != DTK_DATE_M)
1375  {
1376  if ((fmask & DTK_TIME_M) == DTK_TIME_M)
1377  return 1;
1378  return DTERR_BAD_FORMAT;
1379  }
1380 
1381  /*
1382  * If we had a full timezone spec, compute the offset (we could not do
1383  * it before, because we need the date to resolve DST status).
1384  */
1385  if (namedTz != NULL)
1386  {
1387  /* daylight savings time modifier disallowed with full TZ */
1388  if (fmask & DTK_M(DTZMOD))
1389  return DTERR_BAD_FORMAT;
1390 
1391  *tzp = DetermineTimeZoneOffset(tm, namedTz);
1392  }
1393 
1394  /*
1395  * Likewise, if we had a dynamic timezone abbreviation, resolve it
1396  * now.
1397  */
1398  if (abbrevTz != NULL)
1399  {
1400  /* daylight savings time modifier disallowed with dynamic TZ */
1401  if (fmask & DTK_M(DTZMOD))
1402  return DTERR_BAD_FORMAT;
1403 
1404  *tzp = DetermineTimeZoneAbbrevOffset(tm, abbrev, abbrevTz);
1405  }
1406 
1407  /* timezone not specified? then use session timezone */
1408  if (tzp != NULL && !(fmask & DTK_M(TZ)))
1409  {
1410  /*
1411  * daylight savings time modifier but no standard timezone? then
1412  * error
1413  */
1414  if (fmask & DTK_M(DTZMOD))
1415  return DTERR_BAD_FORMAT;
1416 
1417  *tzp = DetermineTimeZoneOffset(tm, session_timezone);
1418  }
1419  }
1420 
1421  return 0;
1422 }
1423 
1424 
1425 /* DetermineTimeZoneOffset()
1426  *
1427  * Given a struct pg_tm in which tm_year, tm_mon, tm_mday, tm_hour, tm_min,
1428  * and tm_sec fields are set, and a zic-style time zone definition, determine
1429  * the applicable GMT offset and daylight-savings status at that time.
1430  * Set the struct pg_tm's tm_isdst field accordingly, and return the GMT
1431  * offset as the function result.
1432  *
1433  * Note: if the date is out of the range we can deal with, we return zero
1434  * as the GMT offset and set tm_isdst = 0. We don't throw an error here,
1435  * though probably some higher-level code will.
1436  */
1437 int
1438 DetermineTimeZoneOffset(struct pg_tm *tm, pg_tz *tzp)
1439 {
1440  pg_time_t t;
1441 
1442  return DetermineTimeZoneOffsetInternal(tm, tzp, &t);
1443 }
1444 
1445 
1446 /* DetermineTimeZoneOffsetInternal()
1447  *
1448  * As above, but also return the actual UTC time imputed to the date/time
1449  * into *tp.
1450  *
1451  * In event of an out-of-range date, we punt by returning zero into *tp.
1452  * This is okay for the immediate callers but is a good reason for not
1453  * exposing this worker function globally.
1454  *
1455  * Note: it might seem that we should use mktime() for this, but bitter
1456  * experience teaches otherwise. This code is much faster than most versions
1457  * of mktime(), anyway.
1458  */
1459 static int
1460 DetermineTimeZoneOffsetInternal(struct pg_tm *tm, pg_tz *tzp, pg_time_t *tp)
1461 {
1462  int date,
1463  sec;
1464  pg_time_t day,
1465  mytime,
1466  prevtime,
1467  boundary,
1468  beforetime,
1469  aftertime;
1470  long int before_gmtoff,
1471  after_gmtoff;
1472  int before_isdst,
1473  after_isdst;
1474  int res;
1475 
1476  /*
1477  * First, generate the pg_time_t value corresponding to the given
1478  * y/m/d/h/m/s taken as GMT time. If this overflows, punt and decide the
1479  * timezone is GMT. (For a valid Julian date, integer overflow should be
1480  * impossible with 64-bit pg_time_t, but let's check for safety.)
1481  */
1482  if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
1483  goto overflow;
1484  date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - UNIX_EPOCH_JDATE;
1485 
1486  day = ((pg_time_t) date) * SECS_PER_DAY;
1487  if (day / SECS_PER_DAY != date)
1488  goto overflow;
1489  sec = tm->tm_sec + (tm->tm_min + tm->tm_hour * MINS_PER_HOUR) * SECS_PER_MINUTE;
1490  mytime = day + sec;
1491  /* since sec >= 0, overflow could only be from +day to -mytime */
1492  if (mytime < 0 && day > 0)
1493  goto overflow;
1494 
1495  /*
1496  * Find the DST time boundary just before or following the target time. We
1497  * assume that all zones have GMT offsets less than 24 hours, and that DST
1498  * boundaries can't be closer together than 48 hours, so backing up 24
1499  * hours and finding the "next" boundary will work.
1500  */
1501  prevtime = mytime - SECS_PER_DAY;
1502  if (mytime < 0 && prevtime > 0)
1503  goto overflow;
1504 
1505  res = pg_next_dst_boundary(&prevtime,
1506  &before_gmtoff, &before_isdst,
1507  &boundary,
1508  &after_gmtoff, &after_isdst,
1509  tzp);
1510  if (res < 0)
1511  goto overflow; /* failure? */
1512 
1513  if (res == 0)
1514  {
1515  /* Non-DST zone, life is simple */
1516  tm->tm_isdst = before_isdst;
1517  *tp = mytime - before_gmtoff;
1518  return -(int) before_gmtoff;
1519  }
1520 
1521  /*
1522  * Form the candidate pg_time_t values with local-time adjustment
1523  */
1524  beforetime = mytime - before_gmtoff;
1525  if ((before_gmtoff > 0 &&
1526  mytime < 0 && beforetime > 0) ||
1527  (before_gmtoff <= 0 &&
1528  mytime > 0 && beforetime < 0))
1529  goto overflow;
1530  aftertime = mytime - after_gmtoff;
1531  if ((after_gmtoff > 0 &&
1532  mytime < 0 && aftertime > 0) ||
1533  (after_gmtoff <= 0 &&
1534  mytime > 0 && aftertime < 0))
1535  goto overflow;
1536 
1537  /*
1538  * If both before or both after the boundary time, we know what to do. The
1539  * boundary time itself is considered to be after the transition, which
1540  * means we can accept aftertime == boundary in the second case.
1541  */
1542  if (beforetime < boundary && aftertime < boundary)
1543  {
1544  tm->tm_isdst = before_isdst;
1545  *tp = beforetime;
1546  return -(int) before_gmtoff;
1547  }
1548  if (beforetime > boundary && aftertime >= boundary)
1549  {
1550  tm->tm_isdst = after_isdst;
1551  *tp = aftertime;
1552  return -(int) after_gmtoff;
1553  }
1554 
1555  /*
1556  * It's an invalid or ambiguous time due to timezone transition. In a
1557  * spring-forward transition, prefer the "before" interpretation; in a
1558  * fall-back transition, prefer "after". (We used to define and implement
1559  * this test as "prefer the standard-time interpretation", but that rule
1560  * does not help to resolve the behavior when both times are reported as
1561  * standard time; which does happen, eg Europe/Moscow in Oct 2014. Also,
1562  * in some zones such as Europe/Dublin, there is widespread confusion
1563  * about which time offset is "standard" time, so it's fortunate that our
1564  * behavior doesn't depend on that.)
1565  */
1566  if (beforetime > aftertime)
1567  {
1568  tm->tm_isdst = before_isdst;
1569  *tp = beforetime;
1570  return -(int) before_gmtoff;
1571  }
1572  tm->tm_isdst = after_isdst;
1573  *tp = aftertime;
1574  return -(int) after_gmtoff;
1575 
1576 overflow:
1577  /* Given date is out of range, so assume UTC */
1578  tm->tm_isdst = 0;
1579  *tp = 0;
1580  return 0;
1581 }
1582 
1583 
1584 /* DetermineTimeZoneAbbrevOffset()
1585  *
1586  * Determine the GMT offset and DST flag to be attributed to a dynamic
1587  * time zone abbreviation, that is one whose meaning has changed over time.
1588  * *tm contains the local time at which the meaning should be determined,
1589  * and tm->tm_isdst receives the DST flag.
1590  *
1591  * This differs from the behavior of DetermineTimeZoneOffset() in that a
1592  * standard-time or daylight-time abbreviation forces use of the corresponding
1593  * GMT offset even when the zone was then in DS or standard time respectively.
1594  * (However, that happens only if we can match the given abbreviation to some
1595  * abbreviation that appears in the IANA timezone data. Otherwise, we fall
1596  * back to doing DetermineTimeZoneOffset().)
1597  */
1598 int
1599 DetermineTimeZoneAbbrevOffset(struct pg_tm *tm, const char *abbr, pg_tz *tzp)
1600 {
1601  pg_time_t t;
1602  int zone_offset;
1603  int abbr_offset;
1604  int abbr_isdst;
1605 
1606  /*
1607  * Compute the UTC time we want to probe at. (In event of overflow, we'll
1608  * probe at the epoch, which is a bit random but probably doesn't matter.)
1609  */
1610  zone_offset = DetermineTimeZoneOffsetInternal(tm, tzp, &t);
1611 
1612  /*
1613  * Try to match the abbreviation to something in the zone definition.
1614  */
1615  if (DetermineTimeZoneAbbrevOffsetInternal(t, abbr, tzp,
1616  &abbr_offset, &abbr_isdst))
1617  {
1618  /* Success, so use the abbrev-specific answers. */
1619  tm->tm_isdst = abbr_isdst;
1620  return abbr_offset;
1621  }
1622 
1623  /*
1624  * No match, so use the answers we already got from
1625  * DetermineTimeZoneOffsetInternal.
1626  */
1627  return zone_offset;
1628 }
1629 
1630 
1631 /* DetermineTimeZoneAbbrevOffsetTS()
1632  *
1633  * As above but the probe time is specified as a TimestampTz (hence, UTC time),
1634  * and DST status is returned into *isdst rather than into tm->tm_isdst.
1635  */
1636 int
1637 DetermineTimeZoneAbbrevOffsetTS(TimestampTz ts, const char *abbr,
1638  pg_tz *tzp, int *isdst)
1639 {
1640  pg_time_t t = timestamptz_to_time_t(ts);
1641  int zone_offset;
1642  int abbr_offset;
1643  int tz;
1644  struct pg_tm tm;
1645  fsec_t fsec;
1646 
1647  /*
1648  * If the abbrev matches anything in the zone data, this is pretty easy.
1649  */
1650  if (DetermineTimeZoneAbbrevOffsetInternal(t, abbr, tzp,
1651  &abbr_offset, isdst))
1652  return abbr_offset;
1653 
1654  /*
1655  * Else, break down the timestamp so we can use DetermineTimeZoneOffset.
1656  */
1657  if (timestamp2tm(ts, &tz, &tm, &fsec, NULL, tzp) != 0)
1658  ereport(ERROR,
1659  (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
1660  errmsg("timestamp out of range")));
1661 
1662  zone_offset = DetermineTimeZoneOffset(&tm, tzp);
1663  *isdst = tm.tm_isdst;
1664  return zone_offset;
1665 }
1666 
1667 
1668 /* DetermineTimeZoneAbbrevOffsetInternal()
1669  *
1670  * Workhorse for above two functions: work from a pg_time_t probe instant.
1671  * On success, return GMT offset and DST status into *offset and *isdst.
1672  */
1673 static bool
1674 DetermineTimeZoneAbbrevOffsetInternal(pg_time_t t, const char *abbr, pg_tz *tzp,
1675  int *offset, int *isdst)
1676 {
1677  char upabbr[TZ_STRLEN_MAX + 1];
1678  unsigned char *p;
1679  long int gmtoff;
1680 
1681  /* We need to force the abbrev to upper case */
1682  strlcpy(upabbr, abbr, sizeof(upabbr));
1683  for (p = (unsigned char *) upabbr; *p; p++)
1684  *p = pg_toupper(*p);
1685 
1686  /* Look up the abbrev's meaning at this time in this zone */
1687  if (pg_interpret_timezone_abbrev(upabbr,
1688  &t,
1689  &gmtoff,
1690  isdst,
1691  tzp))
1692  {
1693  /* Change sign to agree with DetermineTimeZoneOffset() */
1694  *offset = (int) -gmtoff;
1695  return true;
1696  }
1697  return false;
1698 }
1699 
1700 
1701 /* DecodeTimeOnly()
1702  * Interpret parsed string as time fields only.
1703  * Returns 0 if successful, DTERR code if bogus input detected.
1704  *
1705  * Note that support for time zone is here for
1706  * SQL TIME WITH TIME ZONE, but it reveals
1707  * bogosity with SQL date/time standards, since
1708  * we must infer a time zone from current time.
1709  * - thomas 2000-03-10
1710  * Allow specifying date to get a better time zone,
1711  * if time zones are allowed. - thomas 2001-12-26
1712  */
1713 int
1714 DecodeTimeOnly(char **field, int *ftype, int nf,
1715  int *dtype, struct pg_tm *tm, fsec_t *fsec, int *tzp)
1716 {
1717  int fmask = 0,
1718  tmask,
1719  type;
1720  int ptype = 0; /* "prefix type" for ISO h04mm05s06 format */
1721  int i;
1722  int val;
1723  int dterr;
1724  bool isjulian = false;
1725  bool is2digits = false;
1726  bool bc = false;
1727  int mer = HR24;
1728  pg_tz *namedTz = NULL;
1729  pg_tz *abbrevTz = NULL;
1730  char *abbrev = NULL;
1731  pg_tz *valtz;
1732 
1733  *dtype = DTK_TIME;
1734  tm->tm_hour = 0;
1735  tm->tm_min = 0;
1736  tm->tm_sec = 0;
1737  *fsec = 0;
1738  /* don't know daylight savings time status apriori */
1739  tm->tm_isdst = -1;
1740 
1741  if (tzp != NULL)
1742  *tzp = 0;
1743 
1744  for (i = 0; i < nf; i++)
1745  {
1746  switch (ftype[i])
1747  {
1748  case DTK_DATE:
1749 
1750  /*
1751  * Time zone not allowed? Then should not accept dates or time
1752  * zones no matter what else!
1753  */
1754  if (tzp == NULL)
1755  return DTERR_BAD_FORMAT;
1756 
1757  /* Under limited circumstances, we will accept a date... */
1758  if (i == 0 && nf >= 2 &&
1759  (ftype[nf - 1] == DTK_DATE || ftype[1] == DTK_TIME))
1760  {
1761  dterr = DecodeDate(field[i], fmask,
1762  &tmask, &is2digits, tm);
1763  if (dterr)
1764  return dterr;
1765  }
1766  /* otherwise, this is a time and/or time zone */
1767  else
1768  {
1769  if (isdigit((unsigned char) *field[i]))
1770  {
1771  char *cp;
1772 
1773  /*
1774  * Starts with a digit but we already have a time
1775  * field? Then we are in trouble with time already...
1776  */
1777  if ((fmask & DTK_TIME_M) == DTK_TIME_M)
1778  return DTERR_BAD_FORMAT;
1779 
1780  /*
1781  * Should not get here and fail. Sanity check only...
1782  */
1783  if ((cp = strchr(field[i], '-')) == NULL)
1784  return DTERR_BAD_FORMAT;
1785 
1786  /* Get the time zone from the end of the string */
1787  dterr = DecodeTimezone(cp, tzp);
1788  if (dterr)
1789  return dterr;
1790  *cp = '\0';
1791 
1792  /*
1793  * Then read the rest of the field as a concatenated
1794  * time
1795  */
1796  dterr = DecodeNumberField(strlen(field[i]), field[i],
1797  (fmask | DTK_DATE_M),
1798  &tmask, tm,
1799  fsec, &is2digits);
1800  if (dterr < 0)
1801  return dterr;
1802  ftype[i] = dterr;
1803 
1804  tmask |= DTK_M(TZ);
1805  }
1806  else
1807  {
1808  namedTz = pg_tzset(field[i]);
1809  if (!namedTz)
1810  {
1811  /*
1812  * We should return an error code instead of
1813  * ereport'ing directly, but then there is no way
1814  * to report the bad time zone name.
1815  */
1816  ereport(ERROR,
1817  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1818  errmsg("time zone \"%s\" not recognized",
1819  field[i])));
1820  }
1821  /* we'll apply the zone setting below */
1822  ftype[i] = DTK_TZ;
1823  tmask = DTK_M(TZ);
1824  }
1825  }
1826  break;
1827 
1828  case DTK_TIME:
1829  dterr = DecodeTime(field[i], (fmask | DTK_DATE_M),
1830  INTERVAL_FULL_RANGE,
1831  &tmask, tm, fsec);
1832  if (dterr)
1833  return dterr;
1834  break;
1835 
1836  case DTK_TZ:
1837  {
1838  int tz;
1839 
1840  if (tzp == NULL)
1841  return DTERR_BAD_FORMAT;
1842 
1843  dterr = DecodeTimezone(field[i], &tz);
1844  if (dterr)
1845  return dterr;
1846  *tzp = tz;
1847  tmask = DTK_M(TZ);
1848  }
1849  break;
1850 
1851  case DTK_NUMBER:
1852 
1853  /*
1854  * Was this an "ISO time" with embedded field labels? An
1855  * example is "h04mm05s06" - thomas 2001-02-04
1856  */
1857  if (ptype != 0)
1858  {
1859  char *cp;
1860  int val;
1861 
1862  /* Only accept a date under limited circumstances */
1863  switch (ptype)
1864  {
1865  case DTK_JULIAN:
1866  case DTK_YEAR:
1867  case DTK_MONTH:
1868  case DTK_DAY:
1869  if (tzp == NULL)
1870  return DTERR_BAD_FORMAT;
1871  default:
1872  break;
1873  }
1874 
1875  errno = 0;
1876  val = strtoint(field[i], &cp, 10);
1877  if (errno == ERANGE)
1878  return DTERR_FIELD_OVERFLOW;
1879 
1880  /*
1881  * only a few kinds are allowed to have an embedded
1882  * decimal
1883  */
1884  if (*cp == '.')
1885  switch (ptype)
1886  {
1887  case DTK_JULIAN:
1888  case DTK_TIME:
1889  case DTK_SECOND:
1890  break;
1891  default:
1892  return DTERR_BAD_FORMAT;
1893  break;
1894  }
1895  else if (*cp != '\0')
1896  return DTERR_BAD_FORMAT;
1897 
1898  switch (ptype)
1899  {
1900  case DTK_YEAR:
1901  tm->tm_year = val;
1902  tmask = DTK_M(YEAR);
1903  break;
1904 
1905  case DTK_MONTH:
1906 
1907  /*
1908  * already have a month and hour? then assume
1909  * minutes
1910  */
1911  if ((fmask & DTK_M(MONTH)) != 0 &&
1912  (fmask & DTK_M(HOUR)) != 0)
1913  {
1914  tm->tm_min = val;
1915  tmask = DTK_M(MINUTE);
1916  }
1917  else
1918  {
1919  tm->tm_mon = val;
1920  tmask = DTK_M(MONTH);
1921  }
1922  break;
1923 
1924  case DTK_DAY:
1925  tm->tm_mday = val;
1926  tmask = DTK_M(DAY);
1927  break;
1928 
1929  case DTK_HOUR:
1930  tm->tm_hour = val;
1931  tmask = DTK_M(HOUR);
1932  break;
1933 
1934  case DTK_MINUTE:
1935  tm->tm_min = val;
1936  tmask = DTK_M(MINUTE);
1937  break;
1938 
1939  case DTK_SECOND:
1940  tm->tm_sec = val;
1941  tmask = DTK_M(SECOND);
1942  if (*cp == '.')
1943  {
1944  dterr = ParseFractionalSecond(cp, fsec);
1945  if (dterr)
1946  return dterr;
1947  tmask = DTK_ALL_SECS_M;
1948  }
1949  break;
1950 
1951  case DTK_TZ:
1952  tmask = DTK_M(TZ);
1953  dterr = DecodeTimezone(field[i], tzp);
1954  if (dterr)
1955  return dterr;
1956  break;
1957 
1958  case DTK_JULIAN:
1959  /* previous field was a label for "julian date" */
1960  if (val < 0)
1961  return DTERR_FIELD_OVERFLOW;
1962  tmask = DTK_DATE_M;
1963  j2date(val, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
1964  isjulian = true;
1965 
1966  if (*cp == '.')
1967  {
1968  double time;
1969 
1970  errno = 0;
1971  time = strtod(cp, &cp);
1972  if (*cp != '\0' || errno != 0)
1973  return DTERR_BAD_FORMAT;
1974  time *= USECS_PER_DAY;
1975  dt2time(time,
1976  &tm->tm_hour, &tm->tm_min,
1977  &tm->tm_sec, fsec);
1978  tmask |= DTK_TIME_M;
1979  }
1980  break;
1981 
1982  case DTK_TIME:
1983  /* previous field was "t" for ISO time */
1984  dterr = DecodeNumberField(strlen(field[i]), field[i],
1985  (fmask | DTK_DATE_M),
1986  &tmask, tm,
1987  fsec, &is2digits);
1988  if (dterr < 0)
1989  return dterr;
1990  ftype[i] = dterr;
1991 
1992  if (tmask != DTK_TIME_M)
1993  return DTERR_BAD_FORMAT;
1994  break;
1995 
1996  default:
1997  return DTERR_BAD_FORMAT;
1998  break;
1999  }
2000 
2001  ptype = 0;
2002  *dtype = DTK_DATE;
2003  }
2004  else
2005  {
2006  char *cp;
2007  int flen;
2008 
2009  flen = strlen(field[i]);
2010  cp = strchr(field[i], '.');
2011 
2012  /* Embedded decimal? */
2013  if (cp != NULL)
2014  {
2015  /*
2016  * Under limited circumstances, we will accept a
2017  * date...
2018  */
2019  if (i == 0 && nf >= 2 && ftype[nf - 1] == DTK_DATE)
2020  {
2021  dterr = DecodeDate(field[i], fmask,
2022  &tmask, &is2digits, tm);
2023  if (dterr)
2024  return dterr;
2025  }
2026  /* embedded decimal and several digits before? */
2027  else if (flen - strlen(cp) > 2)
2028  {
2029  /*
2030  * Interpret as a concatenated date or time Set
2031  * the type field to allow decoding other fields
2032  * later. Example: 20011223 or 040506
2033  */
2034  dterr = DecodeNumberField(flen, field[i],
2035  (fmask | DTK_DATE_M),
2036  &tmask, tm,
2037  fsec, &is2digits);
2038  if (dterr < 0)
2039  return dterr;
2040  ftype[i] = dterr;
2041  }
2042  else
2043  return DTERR_BAD_FORMAT;
2044  }
2045  else if (flen > 4)
2046  {
2047  dterr = DecodeNumberField(flen, field[i],
2048  (fmask | DTK_DATE_M),
2049  &tmask, tm,
2050  fsec, &is2digits);
2051  if (dterr < 0)
2052  return dterr;
2053  ftype[i] = dterr;
2054  }
2055  /* otherwise it is a single date/time field... */
2056  else
2057  {
2058  dterr = DecodeNumber(flen, field[i],
2059  false,
2060  (fmask | DTK_DATE_M),
2061  &tmask, tm,
2062  fsec, &is2digits);
2063  if (dterr)
2064  return dterr;
2065  }
2066  }
2067  break;
2068 
2069  case DTK_STRING:
2070  case DTK_SPECIAL:
2071  /* timezone abbrevs take precedence over built-in tokens */
2072  type = DecodeTimezoneAbbrev(i, field[i], &val, &valtz);
2073  if (type == UNKNOWN_FIELD)
2074  type = DecodeSpecial(i, field[i], &val);
2075  if (type == IGNORE_DTF)
2076  continue;
2077 
2078  tmask = DTK_M(type);
2079  switch (type)
2080  {
2081  case RESERV:
2082  switch (val)
2083  {
2084  case DTK_NOW:
2085  tmask = DTK_TIME_M;
2086  *dtype = DTK_TIME;
2087  GetCurrentTimeUsec(tm, fsec, NULL);
2088  break;
2089 
2090  case DTK_ZULU:
2091  tmask = (DTK_TIME_M | DTK_M(TZ));
2092  *dtype = DTK_TIME;
2093  tm->tm_hour = 0;
2094  tm->tm_min = 0;
2095  tm->tm_sec = 0;
2096  tm->tm_isdst = 0;
2097  break;
2098 
2099  default:
2100  return DTERR_BAD_FORMAT;
2101  }
2102 
2103  break;
2104 
2105  case DTZMOD:
2106 
2107  /*
2108  * daylight savings time modifier (solves "MET DST"
2109  * syntax)
2110  */
2111  tmask |= DTK_M(DTZ);
2112  tm->tm_isdst = 1;
2113  if (tzp == NULL)
2114  return DTERR_BAD_FORMAT;
2115  *tzp -= val;
2116  break;
2117 
2118  case DTZ:
2119 
2120  /*
2121  * set mask for TZ here _or_ check for DTZ later when
2122  * getting default timezone
2123  */
2124  tmask |= DTK_M(TZ);
2125  tm->tm_isdst = 1;
2126  if (tzp == NULL)
2127  return DTERR_BAD_FORMAT;
2128  *tzp = -val;
2129  ftype[i] = DTK_TZ;
2130  break;
2131 
2132  case TZ:
2133  tm->tm_isdst = 0;
2134  if (tzp == NULL)
2135  return DTERR_BAD_FORMAT;
2136  *tzp = -val;
2137  ftype[i] = DTK_TZ;
2138  break;
2139 
2140  case DYNTZ:
2141  tmask |= DTK_M(TZ);
2142  if (tzp == NULL)
2143  return DTERR_BAD_FORMAT;
2144  /* we'll determine the actual offset later */
2145  abbrevTz = valtz;
2146  abbrev = field[i];
2147  ftype[i] = DTK_TZ;
2148  break;
2149 
2150  case AMPM:
2151  mer = val;
2152  break;
2153 
2154  case ADBC:
2155  bc = (val == BC);
2156  break;
2157 
2158  case UNITS:
2159  tmask = 0;
2160  ptype = val;
2161  break;
2162 
2163  case ISOTIME:
2164  tmask = 0;
2165 
2166  /***
2167  * We will need one of the following fields:
2168  * DTK_NUMBER should be hhmmss.fff
2169  * DTK_TIME should be hh:mm:ss.fff
2170  * DTK_DATE should be hhmmss-zz
2171  ***/
2172  if (i >= nf - 1 ||
2173  (ftype[i + 1] != DTK_NUMBER &&
2174  ftype[i + 1] != DTK_TIME &&
2175  ftype[i + 1] != DTK_DATE))
2176  return DTERR_BAD_FORMAT;
2177 
2178  ptype = val;
2179  break;
2180 
2181  case UNKNOWN_FIELD:
2182 
2183  /*
2184  * Before giving up and declaring error, check to see
2185  * if it is an all-alpha timezone name.
2186  */
2187  namedTz = pg_tzset(field[i]);
2188  if (!namedTz)
2189  return DTERR_BAD_FORMAT;
2190  /* we'll apply the zone setting below */
2191  tmask = DTK_M(TZ);
2192  break;
2193 
2194  default:
2195  return DTERR_BAD_FORMAT;
2196  }
2197  break;
2198 
2199  default:
2200  return DTERR_BAD_FORMAT;
2201  }
2202 
2203  if (tmask & fmask)
2204  return DTERR_BAD_FORMAT;
2205  fmask |= tmask;
2206  } /* end loop over fields */
2207 
2208  /* do final checking/adjustment of Y/M/D fields */
2209  dterr = ValidateDate(fmask, isjulian, is2digits, bc, tm);
2210  if (dterr)
2211  return dterr;
2212 
2213  /* handle AM/PM */
2214  if (mer != HR24 && tm->tm_hour > HOURS_PER_DAY / 2)
2215  return DTERR_FIELD_OVERFLOW;
2216  if (mer == AM && tm->tm_hour == HOURS_PER_DAY / 2)
2217  tm->tm_hour = 0;
2218  else if (mer == PM && tm->tm_hour != HOURS_PER_DAY / 2)
2219  tm->tm_hour += HOURS_PER_DAY / 2;
2220 
2221  /*
2222  * This should match the checks in make_timestamp_internal
2223  */
2224  if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_min > MINS_PER_HOUR - 1 ||
2225  tm->tm_sec < 0 || tm->tm_sec > SECS_PER_MINUTE ||
2226  tm->tm_hour > HOURS_PER_DAY ||
2227  /* test for > 24:00:00 */
2228  (tm->tm_hour == HOURS_PER_DAY &&
2229  (tm->tm_min > 0 || tm->tm_sec > 0 || *fsec > 0)) ||
2230  *fsec < INT64CONST(0) || *fsec > USECS_PER_SEC)
2231  return DTERR_FIELD_OVERFLOW;
2232 
2233  if ((fmask & DTK_TIME_M) != DTK_TIME_M)
2234  return DTERR_BAD_FORMAT;
2235 
2236  /*
2237  * If we had a full timezone spec, compute the offset (we could not do it
2238  * before, because we may need the date to resolve DST status).
2239  */
2240  if (namedTz != NULL)
2241  {
2242  long int gmtoff;
2243 
2244  /* daylight savings time modifier disallowed with full TZ */
2245  if (fmask & DTK_M(DTZMOD))
2246  return DTERR_BAD_FORMAT;
2247 
2248  /* if non-DST zone, we do not need to know the date */
2249  if (pg_get_timezone_offset(namedTz, &gmtoff))
2250  {
2251  *tzp = -(int) gmtoff;
2252  }
2253  else
2254  {
2255  /* a date has to be specified */
2256  if ((fmask & DTK_DATE_M) != DTK_DATE_M)
2257  return DTERR_BAD_FORMAT;
2258  *tzp = DetermineTimeZoneOffset(tm, namedTz);
2259  }
2260  }
2261 
2262  /*
2263  * Likewise, if we had a dynamic timezone abbreviation, resolve it now.
2264  */
2265  if (abbrevTz != NULL)
2266  {
2267  struct pg_tm tt,
2268  *tmp = &tt;
2269 
2270  /*
2271  * daylight savings time modifier but no standard timezone? then error
2272  */
2273  if (fmask & DTK_M(DTZMOD))
2274  return DTERR_BAD_FORMAT;
2275 
2276  if ((fmask & DTK_DATE_M) == 0)
2277  GetCurrentDateTime(tmp);
2278  else
2279  {
2280  /* a date has to be specified */
2281  if ((fmask & DTK_DATE_M) != DTK_DATE_M)
2282  return DTERR_BAD_FORMAT;
2283  tmp->tm_year = tm->tm_year;
2284  tmp->tm_mon = tm->tm_mon;
2285  tmp->tm_mday = tm->tm_mday;
2286  }
2287  tmp->tm_hour = tm->tm_hour;
2288  tmp->tm_min = tm->tm_min;
2289  tmp->tm_sec = tm->tm_sec;
2290  *tzp = DetermineTimeZoneAbbrevOffset(tmp, abbrev, abbrevTz);
2291  tm->tm_isdst = tmp->tm_isdst;
2292  }
2293 
2294  /* timezone not specified? then use session timezone */
2295  if (tzp != NULL && !(fmask & DTK_M(TZ)))
2296  {
2297  struct pg_tm tt,
2298  *tmp = &tt;
2299 
2300  /*
2301  * daylight savings time modifier but no standard timezone? then error
2302  */
2303  if (fmask & DTK_M(DTZMOD))
2304  return DTERR_BAD_FORMAT;
2305 
2306  if ((fmask & DTK_DATE_M) == 0)
2307  GetCurrentDateTime(tmp);
2308  else
2309  {
2310  /* a date has to be specified */
2311  if ((fmask & DTK_DATE_M) != DTK_DATE_M)
2312  return DTERR_BAD_FORMAT;
2313  tmp->tm_year = tm->tm_year;
2314  tmp->tm_mon = tm->tm_mon;
2315  tmp->tm_mday = tm->tm_mday;
2316  }
2317  tmp->tm_hour = tm->tm_hour;
2318  tmp->tm_min = tm->tm_min;
2319  tmp->tm_sec = tm->tm_sec;
2320  *tzp = DetermineTimeZoneOffset(tmp, session_timezone);
2321  tm->tm_isdst = tmp->tm_isdst;
2322  }
2323 
2324  return 0;
2325 }
2326 
2327 /* DecodeDate()
2328  * Decode date string which includes delimiters.
2329  * Return 0 if okay, a DTERR code if not.
2330  *
2331  * str: field to be parsed
2332  * fmask: bitmask for field types already seen
2333  * *tmask: receives bitmask for fields found here
2334  * *is2digits: set to true if we find 2-digit year
2335  * *tm: field values are stored into appropriate members of this struct
2336  */
2337 static int
2338 DecodeDate(char *str, int fmask, int *tmask, bool *is2digits,
2339  struct pg_tm *tm)
2340 {
2341  fsec_t fsec;
2342  int nf = 0;
2343  int i,
2344  len;
2345  int dterr;
2346  bool haveTextMonth = false;
2347  int type,
2348  val,
2349  dmask = 0;
2350  char *field[MAXDATEFIELDS];
2351 
2352  *tmask = 0;
2353 
2354  /* parse this string... */
2355  while (*str != '\0' && nf < MAXDATEFIELDS)
2356  {
2357  /* skip field separators */
2358  while (*str != '\0' && !isalnum((unsigned char) *str))
2359  str++;
2360 
2361  if (*str == '\0')
2362  return DTERR_BAD_FORMAT; /* end of string after separator */
2363 
2364  field[nf] = str;
2365  if (isdigit((unsigned char) *str))
2366  {
2367  while (isdigit((unsigned char) *str))
2368  str++;
2369  }
2370  else if (isalpha((unsigned char) *str))
2371  {
2372  while (isalpha((unsigned char) *str))
2373  str++;
2374  }
2375 
2376  /* Just get rid of any non-digit, non-alpha characters... */
2377  if (*str != '\0')
2378  *str++ = '\0';
2379  nf++;
2380  }
2381 
2382  /* look first for text fields, since that will be unambiguous month */
2383  for (i = 0; i < nf; i++)
2384  {
2385  if (isalpha((unsigned char) *field[i]))
2386  {
2387  type = DecodeSpecial(i, field[i], &val);
2388  if (type == IGNORE_DTF)
2389  continue;
2390 
2391  dmask = DTK_M(type);
2392  switch (type)
2393  {
2394  case MONTH:
2395  tm->tm_mon = val;
2396  haveTextMonth = true;
2397  break;
2398 
2399  default:
2400  return DTERR_BAD_FORMAT;
2401  }
2402  if (fmask & dmask)
2403  return DTERR_BAD_FORMAT;
2404 
2405  fmask |= dmask;
2406  *tmask |= dmask;
2407 
2408  /* mark this field as being completed */
2409  field[i] = NULL;
2410  }
2411  }
2412 
2413  /* now pick up remaining numeric fields */
2414  for (i = 0; i < nf; i++)
2415  {
2416  if (field[i] == NULL)
2417  continue;
2418 
2419  if ((len = strlen(field[i])) <= 0)
2420  return DTERR_BAD_FORMAT;
2421 
2422  dterr = DecodeNumber(len, field[i], haveTextMonth, fmask,
2423  &dmask, tm,
2424  &fsec, is2digits);
2425  if (dterr)
2426  return dterr;
2427 
2428  if (fmask & dmask)
2429  return DTERR_BAD_FORMAT;
2430 
2431  fmask |= dmask;
2432  *tmask |= dmask;
2433  }
2434 
2435  if ((fmask & ~(DTK_M(DOY) | DTK_M(TZ))) != DTK_DATE_M)
2436  return DTERR_BAD_FORMAT;
2437 
2438  /* validation of the field values must wait until ValidateDate() */
2439 
2440  return 0;
2441 }
2442 
2443 /* ValidateDate()
2444  * Check valid year/month/day values, handle BC and DOY cases
2445  * Return 0 if okay, a DTERR code if not.
2446  */
2447 int
2448 ValidateDate(int fmask, bool isjulian, bool is2digits, bool bc,
2449  struct pg_tm *tm)
2450 {
2451  if (fmask & DTK_M(YEAR))
2452  {
2453  if (isjulian)
2454  {
2455  /* tm_year is correct and should not be touched */
2456  }
2457  else if (bc)
2458  {
2459  /* there is no year zero in AD/BC notation */
2460  if (tm->tm_year <= 0)
2461  return DTERR_FIELD_OVERFLOW;
2462  /* internally, we represent 1 BC as year zero, 2 BC as -1, etc */
2463  tm->tm_year = -(tm->tm_year - 1);
2464  }
2465  else if (is2digits)
2466  {
2467  /* process 1 or 2-digit input as 1970-2069 AD, allow '0' and '00' */
2468  if (tm->tm_year < 0) /* just paranoia */
2469  return DTERR_FIELD_OVERFLOW;
2470  if (tm->tm_year < 70)
2471  tm->tm_year += 2000;
2472  else if (tm->tm_year < 100)
2473  tm->tm_year += 1900;
2474  }
2475  else
2476  {
2477  /* there is no year zero in AD/BC notation */
2478  if (tm->tm_year <= 0)
2479  return DTERR_FIELD_OVERFLOW;
2480  }
2481  }
2482 
2483  /* now that we have correct year, decode DOY */
2484  if (fmask & DTK_M(DOY))
2485  {
2486  j2date(date2j(tm->tm_year, 1, 1) + tm->tm_yday - 1,
2487  &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
2488  }
2489 
2490  /* check for valid month */
2491  if (fmask & DTK_M(MONTH))
2492  {
2493  if (tm->tm_mon < 1 || tm->tm_mon > MONTHS_PER_YEAR)
2494  return DTERR_MD_FIELD_OVERFLOW;
2495  }
2496 
2497  /* minimal check for valid day */
2498  if (fmask & DTK_M(DAY))
2499  {
2500  if (tm->tm_mday < 1 || tm->tm_mday > 31)
2501  return DTERR_MD_FIELD_OVERFLOW;
2502  }
2503 
2504  if ((fmask & DTK_DATE_M) == DTK_DATE_M)
2505  {
2506  /*
2507  * Check for valid day of month, now that we know for sure the month
2508  * and year. Note we don't use MD_FIELD_OVERFLOW here, since it seems
2509  * unlikely that "Feb 29" is a YMD-order error.
2510  */
2511  if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
2512  return DTERR_FIELD_OVERFLOW;
2513  }
2514 
2515  return 0;
2516 }
2517 
2518 
2519 /* DecodeTime()
2520  * Decode time string which includes delimiters.
2521  * Return 0 if okay, a DTERR code if not.
2522  *
2523  * Only check the lower limit on hours, since this same code can be
2524  * used to represent time spans.
2525  */
2526 static int
2527 DecodeTime(char *str, int fmask, int range,
2528  int *tmask, struct pg_tm *tm, fsec_t *fsec)
2529 {
2530  char *cp;
2531  int dterr;
2532 
2533  *tmask = DTK_TIME_M;
2534 
2535  errno = 0;
2536  tm->tm_hour = strtoint(str, &cp, 10);
2537  if (errno == ERANGE)
2538  return DTERR_FIELD_OVERFLOW;
2539  if (*cp != ':')
2540  return DTERR_BAD_FORMAT;
2541  errno = 0;
2542  tm->tm_min = strtoint(cp + 1, &cp, 10);
2543  if (errno == ERANGE)
2544  return DTERR_FIELD_OVERFLOW;
2545  if (*cp == '\0')
2546  {
2547  tm->tm_sec = 0;
2548  *fsec = 0;
2549  /* If it's a MINUTE TO SECOND interval, take 2 fields as being mm:ss */
2550  if (range == (INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND)))
2551  {
2552  tm->tm_sec = tm->tm_min;
2553  tm->tm_min = tm->tm_hour;
2554  tm->tm_hour = 0;
2555  }
2556  }
2557  else if (*cp == '.')
2558  {
2559  /* always assume mm:ss.sss is MINUTE TO SECOND */
2560  dterr = ParseFractionalSecond(cp, fsec);
2561  if (dterr)
2562  return dterr;
2563  tm->tm_sec = tm->tm_min;
2564  tm->tm_min = tm->tm_hour;
2565  tm->tm_hour = 0;
2566  }
2567  else if (*cp == ':')
2568  {
2569  errno = 0;
2570  tm->tm_sec = strtoint(cp + 1, &cp, 10);
2571  if (errno == ERANGE)
2572  return DTERR_FIELD_OVERFLOW;
2573  if (*cp == '\0')
2574  *fsec = 0;
2575  else if (*cp == '.')
2576  {
2577  dterr = ParseFractionalSecond(cp, fsec);
2578  if (dterr)
2579  return dterr;
2580  }
2581  else
2582  return DTERR_BAD_FORMAT;
2583  }
2584  else
2585  return DTERR_BAD_FORMAT;
2586 
2587  /* do a sanity check */
2588  if (tm->tm_hour < 0 || tm->tm_min < 0 || tm->tm_min > MINS_PER_HOUR - 1 ||
2589  tm->tm_sec < 0 || tm->tm_sec > SECS_PER_MINUTE ||
2590  *fsec < INT64CONST(0) ||
2591  *fsec > USECS_PER_SEC)
2592  return DTERR_FIELD_OVERFLOW;
2593 
2594  return 0;
2595 }
2596 
2597 
2598 /* DecodeNumber()
2599  * Interpret plain numeric field as a date value in context.
2600  * Return 0 if okay, a DTERR code if not.
2601  */
2602 static int
2603 DecodeNumber(int flen, char *str, bool haveTextMonth, int fmask,
2604  int *tmask, struct pg_tm *tm, fsec_t *fsec, bool *is2digits)
2605 {
2606  int val;
2607  char *cp;
2608  int dterr;
2609 
2610  *tmask = 0;
2611 
2612  errno = 0;
2613  val = strtoint(str, &cp, 10);
2614  if (errno == ERANGE)
2615  return DTERR_FIELD_OVERFLOW;
2616  if (cp == str)
2617  return DTERR_BAD_FORMAT;
2618 
2619  if (*cp == '.')
2620  {
2621  /*
2622  * More than two digits before decimal point? Then could be a date or
2623  * a run-together time: 2001.360 20011225 040506.789
2624  */
2625  if (cp - str > 2)
2626  {
2627  dterr = DecodeNumberField(flen, str,
2628  (fmask | DTK_DATE_M),
2629  tmask, tm,
2630  fsec, is2digits);
2631  if (dterr < 0)
2632  return dterr;
2633  return 0;
2634  }
2635 
2636  dterr = ParseFractionalSecond(cp, fsec);
2637  if (dterr)
2638  return dterr;
2639  }
2640  else if (*cp != '\0')
2641  return DTERR_BAD_FORMAT;
2642 
2643  /* Special case for day of year */
2644  if (flen == 3 && (fmask & DTK_DATE_M) == DTK_M(YEAR) && val >= 1 &&
2645  val <= 366)
2646  {
2647  *tmask = (DTK_M(DOY) | DTK_M(MONTH) | DTK_M(DAY));
2648  tm->tm_yday = val;
2649  /* tm_mon and tm_mday can't actually be set yet ... */
2650  return 0;
2651  }
2652 
2653  /* Switch based on what we have so far */
2654  switch (fmask & DTK_DATE_M)
2655  {
2656  case 0:
2657 
2658  /*
2659  * Nothing so far; make a decision about what we think the input
2660  * is. There used to be lots of heuristics here, but the
2661  * consensus now is to be paranoid. It *must* be either
2662  * YYYY-MM-DD (with a more-than-two-digit year field), or the
2663  * field order defined by DateOrder.
2664  */
2665  if (flen >= 3 || DateOrder == DATEORDER_YMD)
2666  {
2667  *tmask = DTK_M(YEAR);
2668  tm->tm_year = val;
2669  }
2670  else if (DateOrder == DATEORDER_DMY)
2671  {
2672  *tmask = DTK_M(DAY);
2673  tm->tm_mday = val;
2674  }
2675  else
2676  {
2677  *tmask = DTK_M(MONTH);
2678  tm->tm_mon = val;
2679  }
2680  break;
2681 
2682  case (DTK_M(YEAR)):
2683  /* Must be at second field of YY-MM-DD */
2684  *tmask = DTK_M(MONTH);
2685  tm->tm_mon = val;
2686  break;
2687 
2688  case (DTK_M(MONTH)):
2689  if (haveTextMonth)
2690  {
2691  /*
2692  * We are at the first numeric field of a date that included a
2693  * textual month name. We want to support the variants
2694  * MON-DD-YYYY, DD-MON-YYYY, and YYYY-MON-DD as unambiguous
2695  * inputs. We will also accept MON-DD-YY or DD-MON-YY in
2696  * either DMY or MDY modes, as well as YY-MON-DD in YMD mode.
2697  */
2698  if (flen >= 3 || DateOrder == DATEORDER_YMD)
2699  {
2700  *tmask = DTK_M(YEAR);
2701  tm->tm_year = val;
2702  }
2703  else
2704  {
2705  *tmask = DTK_M(DAY);
2706  tm->tm_mday = val;
2707  }
2708  }
2709  else
2710  {
2711  /* Must be at second field of MM-DD-YY */
2712  *tmask = DTK_M(DAY);
2713  tm->tm_mday = val;
2714  }
2715  break;
2716 
2717  case (DTK_M(YEAR) | DTK_M(MONTH)):
2718  if (haveTextMonth)
2719  {
2720  /* Need to accept DD-MON-YYYY even in YMD mode */
2721  if (flen >= 3 && *is2digits)
2722  {
2723  /* Guess that first numeric field is day was wrong */
2724  *tmask = DTK_M(DAY); /* YEAR is already set */
2725  tm->tm_mday = tm->tm_year;
2726  tm->tm_year = val;
2727  *is2digits = false;
2728  }
2729  else
2730  {
2731  *tmask = DTK_M(DAY);
2732  tm->tm_mday = val;
2733  }
2734  }
2735  else
2736  {
2737  /* Must be at third field of YY-MM-DD */
2738  *tmask = DTK_M(DAY);
2739  tm->tm_mday = val;
2740  }
2741  break;
2742 
2743  case (DTK_M(DAY)):
2744  /* Must be at second field of DD-MM-YY */
2745  *tmask = DTK_M(MONTH);
2746  tm->tm_mon = val;
2747  break;
2748 
2749  case (DTK_M(MONTH) | DTK_M(DAY)):
2750  /* Must be at third field of DD-MM-YY or MM-DD-YY */
2751  *tmask = DTK_M(YEAR);
2752  tm->tm_year = val;
2753  break;
2754 
2755  case (DTK_M(YEAR) | DTK_M(MONTH) | DTK_M(DAY)):
2756  /* we have all the date, so it must be a time field */
2757  dterr = DecodeNumberField(flen, str, fmask,
2758  tmask, tm,
2759  fsec, is2digits);
2760  if (dterr < 0)
2761  return dterr;
2762  return 0;
2763 
2764  default:
2765  /* Anything else is bogus input */
2766  return DTERR_BAD_FORMAT;
2767  }
2768 
2769  /*
2770  * When processing a year field, mark it for adjustment if it's only one
2771  * or two digits.
2772  */
2773  if (*tmask == DTK_M(YEAR))
2774  *is2digits = (flen <= 2);
2775 
2776  return 0;
2777 }
2778 
2779 
2780 /* DecodeNumberField()
2781  * Interpret numeric string as a concatenated date or time field.
2782  * Return a DTK token (>= 0) if successful, a DTERR code (< 0) if not.
2783  *
2784  * Use the context of previously decoded fields to help with
2785  * the interpretation.
2786  */
2787 static int
2788 DecodeNumberField(int len, char *str, int fmask,
2789  int *tmask, struct pg_tm *tm, fsec_t *fsec, bool *is2digits)
2790 {
2791  char *cp;
2792 
2793  /*
2794  * Have a decimal point? Then this is a date or something with a seconds
2795  * field...
2796  */
2797  if ((cp = strchr(str, '.')) != NULL)
2798  {
2799  /*
2800  * Can we use ParseFractionalSecond here? Not clear whether trailing
2801  * junk should be rejected ...
2802  */
2803  double frac;
2804 
2805  errno = 0;
2806  frac = strtod(cp, NULL);
2807  if (errno != 0)
2808  return DTERR_BAD_FORMAT;
2809  *fsec = rint(frac * 1000000);
2810  /* Now truncate off the fraction for further processing */
2811  *cp = '\0';
2812  len = strlen(str);
2813  }
2814  /* No decimal point and no complete date yet? */
2815  else if ((fmask & DTK_DATE_M) != DTK_DATE_M)
2816  {
2817  if (len >= 6)
2818  {
2819  *tmask = DTK_DATE_M;
2820 
2821  /*
2822  * Start from end and consider first 2 as Day, next 2 as Month,
2823  * and the rest as Year.
2824  */
2825  tm->tm_mday = atoi(str + (len - 2));
2826  *(str + (len - 2)) = '\0';
2827  tm->tm_mon = atoi(str + (len - 4));
2828  *(str + (len - 4)) = '\0';
2829  tm->tm_year = atoi(str);
2830  if ((len - 4) == 2)
2831  *is2digits = true;
2832 
2833  return DTK_DATE;
2834  }
2835  }
2836 
2837  /* not all time fields are specified? */
2838  if ((fmask & DTK_TIME_M) != DTK_TIME_M)
2839  {
2840  /* hhmmss */
2841  if (len == 6)
2842  {
2843  *tmask = DTK_TIME_M;
2844  tm->tm_sec = atoi(str + 4);
2845  *(str + 4) = '\0';
2846  tm->tm_min = atoi(str + 2);
2847  *(str + 2) = '\0';
2848  tm->tm_hour = atoi(str);
2849 
2850  return DTK_TIME;
2851  }
2852  /* hhmm? */
2853  else if (len == 4)
2854  {
2855  *tmask = DTK_TIME_M;
2856  tm->tm_sec = 0;
2857  tm->tm_min = atoi(str + 2);
2858  *(str + 2) = '\0';
2859  tm->tm_hour = atoi(str);
2860 
2861  return DTK_TIME;
2862  }
2863  }
2864 
2865  return DTERR_BAD_FORMAT;
2866 }
2867 
2868 
2869 /* DecodeTimezone()
2870  * Interpret string as a numeric timezone.
2871  *
2872  * Return 0 if okay (and set *tzp), a DTERR code if not okay.
2873  */
2874 int
2875 DecodeTimezone(char *str, int *tzp)
2876 {
2877  int tz;
2878  int hr,
2879  min,
2880  sec = 0;
2881  char *cp;
2882 
2883  /* leading character must be "+" or "-" */
2884  if (*str != '+' && *str != '-')
2885  return DTERR_BAD_FORMAT;
2886 
2887  errno = 0;
2888  hr = strtoint(str + 1, &cp, 10);
2889  if (errno == ERANGE)
2890  return DTERR_TZDISP_OVERFLOW;
2891 
2892  /* explicit delimiter? */
2893  if (*cp == ':')
2894  {
2895  errno = 0;
2896  min = strtoint(cp + 1, &cp, 10);
2897  if (errno == ERANGE)
2898  return DTERR_TZDISP_OVERFLOW;
2899  if (*cp == ':')
2900  {
2901  errno = 0;
2902  sec = strtoint(cp + 1, &cp, 10);
2903  if (errno == ERANGE)
2904  return DTERR_TZDISP_OVERFLOW;
2905  }
2906  }
2907  /* otherwise, might have run things together... */
2908  else if (*cp == '\0' && strlen(str) > 3)
2909  {
2910  min = hr % 100;
2911  hr = hr / 100;
2912  /* we could, but don't, support a run-together hhmmss format */
2913  }
2914  else
2915  min = 0;
2916 
2917  /* Range-check the values; see notes in datatype/timestamp.h */
2918  if (hr < 0 || hr > MAX_TZDISP_HOUR)
2919  return DTERR_TZDISP_OVERFLOW;
2920  if (min < 0 || min >= MINS_PER_HOUR)
2921  return DTERR_TZDISP_OVERFLOW;
2922  if (sec < 0 || sec >= SECS_PER_MINUTE)
2923  return DTERR_TZDISP_OVERFLOW;
2924 
2925  tz = (hr * MINS_PER_HOUR + min) * SECS_PER_MINUTE + sec;
2926  if (*str == '-')
2927  tz = -tz;
2928 
2929  *tzp = -tz;
2930 
2931  if (*cp != '\0')
2932  return DTERR_BAD_FORMAT;
2933 
2934  return 0;
2935 }
2936 
2937 
2938 /* DecodeTimezoneAbbrev()
2939  * Interpret string as a timezone abbreviation, if possible.
2940  *
2941  * Returns an abbreviation type (TZ, DTZ, or DYNTZ), or UNKNOWN_FIELD if
2942  * string is not any known abbreviation. On success, set *offset and *tz to
2943  * represent the UTC offset (for TZ or DTZ) or underlying zone (for DYNTZ).
2944  * Note that full timezone names (such as America/New_York) are not handled
2945  * here, mostly for historical reasons.
2946  *
2947  * Given string must be lowercased already.
2948  *
2949  * Implement a cache lookup since it is likely that dates
2950  * will be related in format.
2951  */
2952 int
2953 DecodeTimezoneAbbrev(int field, char *lowtoken,
2954  int *offset, pg_tz **tz)
2955 {
2956  int type;
2957  const datetkn *tp;
2958 
2959  tp = abbrevcache[field];
2960  /* use strncmp so that we match truncated tokens */
2961  if (tp == NULL || strncmp(lowtoken, tp->token, TOKMAXLEN) != 0)
2962  {
2963  if (zoneabbrevtbl)
2964  tp = datebsearch(lowtoken, zoneabbrevtbl->abbrevs,
2965  zoneabbrevtbl->numabbrevs);
2966  else
2967  tp = NULL;
2968  }
2969  if (tp == NULL)
2970  {
2971  type = UNKNOWN_FIELD;
2972  *offset = 0;
2973  *tz = NULL;
2974  }
2975  else
2976  {
2977  abbrevcache[field] = tp;
2978  type = tp->type;
2979  if (type == DYNTZ)
2980  {
2981  *offset = 0;
2982  *tz = FetchDynamicTimeZone(zoneabbrevtbl, tp);
2983  }
2984  else
2985  {
2986  *offset = tp->value;
2987  *tz = NULL;
2988  }
2989  }
2990 
2991  return type;
2992 }
2993 
2994 
2995 /* DecodeSpecial()
2996  * Decode text string using lookup table.
2997  *
2998  * Recognizes the keywords listed in datetktbl.
2999  * Note: at one time this would also recognize timezone abbreviations,
3000  * but no more; use DecodeTimezoneAbbrev for that.
3001  *
3002  * Given string must be lowercased already.
3003  *
3004  * Implement a cache lookup since it is likely that dates
3005  * will be related in format.
3006  */
3007 int
3008 DecodeSpecial(int field, char *lowtoken, int *val)
3009 {
3010  int type;
3011  const datetkn *tp;
3012 
3013  tp = datecache[field];
3014  /* use strncmp so that we match truncated tokens */
3015  if (tp == NULL || strncmp(lowtoken, tp->token, TOKMAXLEN) != 0)
3016  {
3017  tp = datebsearch(lowtoken, datetktbl, szdatetktbl);
3018  }
3019  if (tp == NULL)
3020  {
3021  type = UNKNOWN_FIELD;
3022  *val = 0;
3023  }
3024  else
3025  {
3026  datecache[field] = tp;
3027  type = tp->type;
3028  *val = tp->value;
3029  }
3030 
3031  return type;
3032 }
3033 
3034 
3035 /* ClearPgTm
3036  *
3037  * Zero out a pg_tm and associated fsec_t
3038  */
3039 static inline void
3040 ClearPgTm(struct pg_tm *tm, fsec_t *fsec)
3041 {
3042  tm->tm_year = 0;
3043  tm->tm_mon = 0;
3044  tm->tm_mday = 0;
3045  tm->tm_hour = 0;
3046  tm->tm_min = 0;
3047  tm->tm_sec = 0;
3048  *fsec = 0;
3049 }
3050 
3051 
3052 /* DecodeInterval()
3053  * Interpret previously parsed fields for general time interval.
3054  * Returns 0 if successful, DTERR code if bogus input detected.
3055  * dtype, tm, fsec are output parameters.
3056  *
3057  * Allow "date" field DTK_DATE since this could be just
3058  * an unsigned floating point number. - thomas 1997-11-16
3059  *
3060  * Allow ISO-style time span, with implicit units on number of days
3061  * preceding an hh:mm:ss field. - thomas 1998-04-30
3062  */
3063 int
3064 DecodeInterval(char **field, int *ftype, int nf, int range,
3065  int *dtype, struct pg_tm *tm, fsec_t *fsec)
3066 {
3067  bool is_before = false;
3068  char *cp;
3069  int fmask = 0,
3070  tmask,
3071  type;
3072  int i;
3073  int dterr;
3074  int val;
3075  double fval;
3076 
3077  *dtype = DTK_DELTA;
3078  type = IGNORE_DTF;
3079  ClearPgTm(tm, fsec);
3080 
3081  /* read through list backwards to pick up units before values */
3082  for (i = nf - 1; i >= 0; i--)
3083  {
3084  switch (ftype[i])
3085  {
3086  case DTK_TIME:
3087  dterr = DecodeTime(field[i], fmask, range,
3088  &tmask, tm, fsec);
3089  if (dterr)
3090  return dterr;
3091  type = DTK_DAY;
3092  break;
3093 
3094  case DTK_TZ:
3095 
3096  /*
3097  * Timezone means a token with a leading sign character and at
3098  * least one digit; there could be ':', '.', '-' embedded in
3099  * it as well.
3100  */
3101  Assert(*field[i] == '-' || *field[i] == '+');
3102 
3103  /*
3104  * Check for signed hh:mm or hh:mm:ss. If so, process exactly
3105  * like DTK_TIME case above, plus handling the sign.
3106  */
3107  if (strchr(field[i] + 1, ':') != NULL &&
3108  DecodeTime(field[i] + 1, fmask, range,
3109  &tmask, tm, fsec) == 0)
3110  {
3111  if (*field[i] == '-')
3112  {
3113  /* flip the sign on all fields */
3114  tm->tm_hour = -tm->tm_hour;
3115  tm->tm_min = -tm->tm_min;
3116  tm->tm_sec = -tm->tm_sec;
3117  *fsec = -(*fsec);
3118  }
3119 
3120  /*
3121  * Set the next type to be a day, if units are not
3122  * specified. This handles the case of '1 +02:03' since we
3123  * are reading right to left.
3124  */
3125  type = DTK_DAY;
3126  break;
3127  }
3128 
3129  /*
3130  * Otherwise, fall through to DTK_NUMBER case, which can
3131  * handle signed float numbers and signed year-month values.
3132  */
3133 
3134  /* FALLTHROUGH */
3135 
3136  case DTK_DATE:
3137  case DTK_NUMBER:
3138  if (type == IGNORE_DTF)
3139  {
3140  /* use typmod to decide what rightmost field is */
3141  switch (range)
3142  {
3143  case INTERVAL_MASK(YEAR):
3144  type = DTK_YEAR;
3145  break;
3146  case INTERVAL_MASK(MONTH):
3147  case INTERVAL_MASK(YEAR) | INTERVAL_MASK(MONTH):
3148  type = DTK_MONTH;
3149  break;
3150  case INTERVAL_MASK(DAY):
3151  type = DTK_DAY;
3152  break;
3153  case INTERVAL_MASK(HOUR):
3154  case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR):
3155  type = DTK_HOUR;
3156  break;
3157  case INTERVAL_MASK(MINUTE):
3158  case INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE):
3159  case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE):
3160  type = DTK_MINUTE;
3161  break;
3162  case INTERVAL_MASK(SECOND):
3163  case INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
3164  case INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
3165  case INTERVAL_MASK(DAY) | INTERVAL_MASK(HOUR) | INTERVAL_MASK(MINUTE) | INTERVAL_MASK(SECOND):
3166  type = DTK_SECOND;
3167  break;
3168  default:
3169  type = DTK_SECOND;
3170  break;
3171  }
3172  }
3173 
3174  errno = 0;
3175  val = strtoint(field[i], &cp, 10);
3176  if (errno == ERANGE)
3177  return DTERR_FIELD_OVERFLOW;
3178 
3179  if (*cp == '-')
3180  {
3181  /* SQL "years-months" syntax */
3182  int val2;
3183 
3184  val2 = strtoint(cp + 1, &cp, 10);
3185  if (errno == ERANGE || val2 < 0 || val2 >= MONTHS_PER_YEAR)
3186  return DTERR_FIELD_OVERFLOW;
3187  if (*cp != '\0')
3188  return DTERR_BAD_FORMAT;
3189  type = DTK_MONTH;
3190  if (*field[i] == '-')
3191  val2 = -val2;
3192  if (((double) val * MONTHS_PER_YEAR + val2) > INT_MAX ||
3193  ((double) val * MONTHS_PER_YEAR + val2) < INT_MIN)
3194  return DTERR_FIELD_OVERFLOW;
3195  val = val * MONTHS_PER_YEAR + val2;
3196  fval = 0;
3197  }
3198  else if (*cp == '.')
3199  {
3200  errno = 0;
3201  fval = strtod(cp, &cp);
3202  if (*cp != '\0' || errno != 0)
3203  return DTERR_BAD_FORMAT;
3204 
3205  if (*field[i] == '-')
3206  fval = -fval;
3207  }
3208  else if (*cp == '\0')
3209  fval = 0;
3210  else
3211  return DTERR_BAD_FORMAT;
3212 
3213  tmask = 0; /* DTK_M(type); */
3214 
3215  switch (type)
3216  {
3217  case DTK_MICROSEC:
3218  *fsec += rint(val + fval);
3219  tmask = DTK_M(MICROSECOND);
3220  break;
3221 
3222  case DTK_MILLISEC:
3223  /* avoid overflowing the fsec field */
3224  tm->tm_sec += val / 1000;
3225  val -= (val / 1000) * 1000;
3226  *fsec += rint((val + fval) * 1000);
3227  tmask = DTK_M(MILLISECOND);
3228  break;
3229 
3230  case DTK_SECOND:
3231  tm->tm_sec += val;
3232  *fsec += rint(fval * 1000000);
3233 
3234  /*
3235  * If any subseconds were specified, consider this
3236  * microsecond and millisecond input as well.
3237  */
3238  if (fval == 0)
3239  tmask = DTK_M(SECOND);
3240  else
3241  tmask = DTK_ALL_SECS_M;
3242  break;
3243 
3244  case DTK_MINUTE:
3245  tm->tm_min += val;
3246  AdjustFractSeconds(fval, tm, fsec, SECS_PER_MINUTE);
3247  tmask = DTK_M(MINUTE);
3248  break;
3249 
3250  case DTK_HOUR:
3251  tm->tm_hour += val;
3252  AdjustFractSeconds(fval, tm, fsec, SECS_PER_HOUR);
3253  tmask = DTK_M(HOUR);
3254  type = DTK_DAY; /* set for next field */
3255  break;
3256 
3257  case DTK_DAY:
3258  tm->tm_mday += val;
3259  AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
3260  tmask = DTK_M(DAY);
3261  break;
3262 
3263  case DTK_WEEK:
3264  tm->tm_mday += val * 7;
3265  AdjustFractDays(fval, tm, fsec, 7);
3266  tmask = DTK_M(WEEK);
3267  break;
3268 
3269  case DTK_MONTH:
3270  tm->tm_mon += val;
3271  AdjustFractDays(fval, tm, fsec, DAYS_PER_MONTH);
3272  tmask = DTK_M(MONTH);
3273  break;
3274 
3275  case DTK_YEAR:
3276  tm->tm_year += val;
3277  if (fval != 0)
3278  tm->tm_mon += fval * MONTHS_PER_YEAR;
3279  tmask = DTK_M(YEAR);
3280  break;
3281 
3282  case DTK_DECADE:
3283  tm->tm_year += val * 10;
3284  if (fval != 0)
3285  tm->tm_mon += fval * MONTHS_PER_YEAR * 10;
3286  tmask = DTK_M(DECADE);
3287  break;
3288 
3289  case DTK_CENTURY:
3290  tm->tm_year += val * 100;
3291  if (fval != 0)
3292  tm->tm_mon += fval * MONTHS_PER_YEAR * 100;
3293  tmask = DTK_M(CENTURY);
3294  break;
3295 
3296  case DTK_MILLENNIUM:
3297  tm->tm_year += val * 1000;
3298  if (fval != 0)
3299  tm->tm_mon += fval * MONTHS_PER_YEAR * 1000;
3300  tmask = DTK_M(MILLENNIUM);
3301  break;
3302 
3303  default:
3304  return DTERR_BAD_FORMAT;
3305  }
3306  break;
3307 
3308  case DTK_STRING:
3309  case DTK_SPECIAL:
3310  type = DecodeUnits(i, field[i], &val);
3311  if (type == IGNORE_DTF)
3312  continue;
3313 
3314  tmask = 0; /* DTK_M(type); */
3315  switch (type)
3316  {
3317  case UNITS:
3318  type = val;
3319  break;
3320 
3321  case AGO:
3322  is_before = true;
3323  type = val;
3324  break;
3325 
3326  case RESERV:
3327  tmask = (DTK_DATE_M | DTK_TIME_M);
3328  *dtype = val;
3329  break;
3330 
3331  default:
3332  return DTERR_BAD_FORMAT;
3333  }
3334  break;
3335 
3336  default:
3337  return DTERR_BAD_FORMAT;
3338  }
3339 
3340  if (tmask & fmask)
3341  return DTERR_BAD_FORMAT;
3342  fmask |= tmask;
3343  }
3344 
3345  /* ensure that at least one time field has been found */
3346  if (fmask == 0)
3347  return DTERR_BAD_FORMAT;
3348 
3349  /* ensure fractional seconds are fractional */
3350  if (*fsec != 0)
3351  {
3352  int sec;
3353 
3354  sec = *fsec / USECS_PER_SEC;
3355  *fsec -= sec * USECS_PER_SEC;
3356  tm->tm_sec += sec;
3357  }
3358 
3359  /*----------
3360  * The SQL standard defines the interval literal
3361  * '-1 1:00:00'
3362  * to mean "negative 1 days and negative 1 hours", while Postgres
3363  * traditionally treats this as meaning "negative 1 days and positive
3364  * 1 hours". In SQL_STANDARD intervalstyle, we apply the leading sign
3365  * to all fields if there are no other explicit signs.
3366  *
3367  * We leave the signs alone if there are additional explicit signs.
3368  * This protects us against misinterpreting postgres-style dump output,
3369  * since the postgres-style output code has always put an explicit sign on
3370  * all fields following a negative field. But note that SQL-spec output
3371  * is ambiguous and can be misinterpreted on load! (So it's best practice
3372  * to dump in postgres style, not SQL style.)
3373  *----------
3374  */
3375  if (IntervalStyle == INTSTYLE_SQL_STANDARD && *field[0] == '-')
3376  {
3377  /* Check for additional explicit signs */
3378  bool more_signs = false;
3379 
3380  for (i = 1; i < nf; i++)
3381  {
3382  if (*field[i] == '-' || *field[i] == '+')
3383  {
3384  more_signs = true;
3385  break;
3386  }
3387  }
3388 
3389  if (!more_signs)
3390  {
3391  /*
3392  * Rather than re-determining which field was field[0], just force
3393  * 'em all negative.
3394  */
3395  if (*fsec > 0)
3396  *fsec = -(*fsec);
3397  if (tm->tm_sec > 0)
3398  tm->tm_sec = -tm->tm_sec;
3399  if (tm->tm_min > 0)
3400  tm->tm_min = -tm->tm_min;
3401  if (tm->tm_hour > 0)
3402  tm->tm_hour = -tm->tm_hour;
3403  if (tm->tm_mday > 0)
3404  tm->tm_mday = -tm->tm_mday;
3405  if (tm->tm_mon > 0)
3406  tm->tm_mon = -tm->tm_mon;
3407  if (tm->tm_year > 0)
3408  tm->tm_year = -tm->tm_year;
3409  }
3410  }
3411 
3412  /* finally, AGO negates everything */
3413  if (is_before)
3414  {
3415  *fsec = -(*fsec);
3416  tm->tm_sec = -tm->tm_sec;
3417  tm->tm_min = -tm->tm_min;
3418  tm->tm_hour = -tm->tm_hour;
3419  tm->tm_mday = -tm->tm_mday;
3420  tm->tm_mon = -tm->tm_mon;
3421  tm->tm_year = -tm->tm_year;
3422  }
3423 
3424  return 0;
3425 }
3426 
3427 
3428 /*
3429  * Helper functions to avoid duplicated code in DecodeISO8601Interval.
3430  *
3431  * Parse a decimal value and break it into integer and fractional parts.
3432  * Returns 0 or DTERR code.
3433  */
3434 static int
3435 ParseISO8601Number(char *str, char **endptr, int *ipart, double *fpart)
3436 {
3437  double val;
3438 
3439  if (!(isdigit((unsigned char) *str) || *str == '-' || *str == '.'))
3440  return DTERR_BAD_FORMAT;
3441  errno = 0;
3442  val = strtod(str, endptr);
3443  /* did we not see anything that looks like a double? */
3444  if (*endptr == str || errno != 0)
3445  return DTERR_BAD_FORMAT;
3446  /* watch out for overflow */
3447  if (val < INT_MIN || val > INT_MAX)
3448  return DTERR_FIELD_OVERFLOW;
3449  /* be very sure we truncate towards zero (cf dtrunc()) */
3450  if (val >= 0)
3451  *ipart = (int) floor(val);
3452  else
3453  *ipart = (int) -floor(-val);
3454  *fpart = val - *ipart;
3455  return 0;
3456 }
3457 
3458 /*
3459  * Determine number of integral digits in a valid ISO 8601 number field
3460  * (we should ignore sign and any fraction part)
3461  */
3462 static int
3463 ISO8601IntegerWidth(char *fieldstart)
3464 {
3465  /* We might have had a leading '-' */
3466  if (*fieldstart == '-')
3467  fieldstart++;
3468  return strspn(fieldstart, "0123456789");
3469 }
3470 
3471 
3472 /* DecodeISO8601Interval()
3473  * Decode an ISO 8601 time interval of the "format with designators"
3474  * (section 4.4.3.2) or "alternative format" (section 4.4.3.3)
3475  * Examples: P1D for 1 day
3476  * PT1H for 1 hour
3477  * P2Y6M7DT1H30M for 2 years, 6 months, 7 days 1 hour 30 min
3478  * P0002-06-07T01:30:00 the same value in alternative format
3479  *
3480  * Returns 0 if successful, DTERR code if bogus input detected.
3481  * Note: error code should be DTERR_BAD_FORMAT if input doesn't look like
3482  * ISO8601, otherwise this could cause unexpected error messages.
3483  * dtype, tm, fsec are output parameters.
3484  *
3485  * A couple exceptions from the spec:
3486  * - a week field ('W') may coexist with other units
3487  * - allows decimals in fields other than the least significant unit.
3488  */
3489 int
3490 DecodeISO8601Interval(char *str,
3491  int *dtype, struct pg_tm *tm, fsec_t *fsec)
3492 {
3493  bool datepart = true;
3494  bool havefield = false;
3495 
3496  *dtype = DTK_DELTA;
3497  ClearPgTm(tm, fsec);
3498 
3499  if (strlen(str) < 2 || str[0] != 'P')
3500  return DTERR_BAD_FORMAT;
3501 
3502  str++;
3503  while (*str)
3504  {
3505  char *fieldstart;
3506  int val;
3507  double fval;
3508  char unit;
3509  int dterr;
3510 
3511  if (*str == 'T') /* T indicates the beginning of the time part */
3512  {
3513  datepart = false;
3514  havefield = false;
3515  str++;
3516  continue;
3517  }
3518 
3519  fieldstart = str;
3520  dterr = ParseISO8601Number(str, &str, &val, &fval);
3521  if (dterr)
3522  return dterr;
3523 
3524  /*
3525  * Note: we could step off the end of the string here. Code below
3526  * *must* exit the loop if unit == '\0'.
3527  */
3528  unit = *str++;
3529 
3530  if (datepart)
3531  {
3532  switch (unit) /* before T: Y M W D */
3533  {
3534  case 'Y':
3535  tm->tm_year += val;
3536  tm->tm_mon += (fval * MONTHS_PER_YEAR);
3537  break;
3538  case 'M':
3539  tm->tm_mon += val;
3540  AdjustFractDays(fval, tm, fsec, DAYS_PER_MONTH);
3541  break;
3542  case 'W':
3543  tm->tm_mday += val * 7;
3544  AdjustFractDays(fval, tm, fsec, 7);
3545  break;
3546  case 'D':
3547  tm->tm_mday += val;
3548  AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
3549  break;
3550  case 'T': /* ISO 8601 4.4.3.3 Alternative Format / Basic */
3551  case '\0':
3552  if (ISO8601IntegerWidth(fieldstart) == 8 && !havefield)
3553  {
3554  tm->tm_year += val / 10000;
3555  tm->tm_mon += (val / 100) % 100;
3556  tm->tm_mday += val % 100;
3557  AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
3558  if (unit == '\0')
3559  return 0;
3560  datepart = false;
3561  havefield = false;
3562  continue;
3563  }
3564  /* Else fall through to extended alternative format */
3565  /* FALLTHROUGH */
3566  case '-': /* ISO 8601 4.4.3.3 Alternative Format,
3567  * Extended */
3568  if (havefield)
3569  return DTERR_BAD_FORMAT;
3570 
3571  tm->tm_year += val;
3572  tm->tm_mon += (fval * MONTHS_PER_YEAR);
3573  if (unit == '\0')
3574  return 0;
3575  if (unit == 'T')
3576  {
3577  datepart = false;
3578  havefield = false;
3579  continue;
3580  }
3581 
3582  dterr = ParseISO8601Number(str, &str, &val, &fval);
3583  if (dterr)
3584  return dterr;
3585  tm->tm_mon += val;
3586  AdjustFractDays(fval, tm, fsec, DAYS_PER_MONTH);
3587  if (*str == '\0')
3588  return 0;
3589  if (*str == 'T')
3590  {
3591  datepart = false;
3592  havefield = false;
3593  continue;
3594  }
3595  if (*str != '-')
3596  return DTERR_BAD_FORMAT;
3597  str++;
3598 
3599  dterr = ParseISO8601Number(str, &str, &val, &fval);
3600  if (dterr)
3601  return dterr;
3602  tm->tm_mday += val;
3603  AdjustFractSeconds(fval, tm, fsec, SECS_PER_DAY);
3604  if (*str == '\0')
3605  return 0;
3606  if (*str == 'T')
3607  {
3608  datepart = false;
3609  havefield = false;
3610  continue;
3611  }
3612  return DTERR_BAD_FORMAT;
3613  default:
3614  /* not a valid date unit suffix */
3615  return DTERR_BAD_FORMAT;
3616  }
3617  }
3618  else
3619  {
3620  switch (unit) /* after T: H M S */
3621  {
3622  case 'H':
3623  tm->tm_hour += val;
3624  AdjustFractSeconds(fval, tm, fsec, SECS_PER_HOUR);
3625  break;
3626  case 'M':
3627  tm->tm_min += val;
3628  AdjustFractSeconds(fval, tm, fsec, SECS_PER_MINUTE);
3629  break;
3630  case 'S':
3631  tm->tm_sec += val;
3632  AdjustFractSeconds(fval, tm, fsec, 1);
3633  break;
3634  case '\0': /* ISO 8601 4.4.3.3 Alternative Format */
3635  if (ISO8601IntegerWidth(fieldstart) == 6 && !havefield)
3636  {
3637  tm->tm_hour += val / 10000;
3638  tm->tm_min += (val / 100) % 100;
3639  tm->tm_sec += val % 100;
3640  AdjustFractSeconds(fval, tm, fsec, 1);
3641  return 0;
3642  }
3643  /* Else fall through to extended alternative format */
3644  /* FALLTHROUGH */
3645  case ':': /* ISO 8601 4.4.3.3 Alternative Format,
3646  * Extended */
3647  if (havefield)
3648  return DTERR_BAD_FORMAT;
3649 
3650  tm->tm_hour += val;
3651  AdjustFractSeconds(fval, tm, fsec, SECS_PER_HOUR);
3652  if (unit == '\0')
3653  return 0;
3654 
3655  dterr = ParseISO8601Number(str, &str, &val, &fval);
3656  if (dterr)
3657  return dterr;
3658  tm->tm_min += val;
3659  AdjustFractSeconds(fval, tm, fsec, SECS_PER_MINUTE);
3660  if (*str == '\0')
3661  return 0;
3662  if (*str != ':')
3663  return DTERR_BAD_FORMAT;
3664  str++;
3665 
3666  dterr = ParseISO8601Number(str, &str, &val, &fval);
3667  if (dterr)
3668  return dterr;
3669  tm->tm_sec += val;
3670  AdjustFractSeconds(fval, tm, fsec, 1);
3671  if (*str == '\0')
3672  return 0;
3673  return DTERR_BAD_FORMAT;
3674 
3675  default:
3676  /* not a valid time unit suffix */
3677  return DTERR_BAD_FORMAT;
3678  }
3679  }
3680 
3681  havefield = true;
3682  }
3683 
3684  return 0;
3685 }
3686 
3687 
3688 /* DecodeUnits()
3689  * Decode text string using lookup table.
3690  *
3691  * This routine recognizes keywords associated with time interval units.
3692  *
3693  * Given string must be lowercased already.
3694  *
3695  * Implement a cache lookup since it is likely that dates
3696  * will be related in format.
3697  */
3698 int
3699 DecodeUnits(int field, char *lowtoken, int *val)
3700 {
3701  int type;
3702  const datetkn *tp;
3703 
3704  tp = deltacache[field];
3705  /* use strncmp so that we match truncated tokens */
3706  if (tp == NULL || strncmp(lowtoken, tp->token, TOKMAXLEN) != 0)
3707  {
3708  tp = datebsearch(lowtoken, deltatktbl, szdeltatktbl);
3709  }
3710  if (tp == NULL)
3711  {
3712  type = UNKNOWN_FIELD;
3713  *val = 0;
3714  }
3715  else
3716  {
3717  deltacache[field] = tp;
3718  type = tp->type;
3719  *val = tp->value;
3720  }
3721 
3722  return type;
3723 } /* DecodeUnits() */
3724 
3725 /*
3726  * Report an error detected by one of the datetime input processing routines.
3727  *
3728  * dterr is the error code, str is the original input string, datatype is
3729  * the name of the datatype we were trying to accept.
3730  *
3731  * Note: it might seem useless to distinguish DTERR_INTERVAL_OVERFLOW and
3732  * DTERR_TZDISP_OVERFLOW from DTERR_FIELD_OVERFLOW, but SQL99 mandates three
3733  * separate SQLSTATE codes, so ...
3734  */
3735 void
3736 DateTimeParseError(int dterr, const char *str, const char *datatype)
3737 {
3738  switch (dterr)
3739  {
3740  case DTERR_FIELD_OVERFLOW:
3741  ereport(ERROR,
3742  (errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
3743  errmsg("date/time field value out of range: \"%s\"",
3744  str)));
3745  break;
3746  case DTERR_MD_FIELD_OVERFLOW:
3747  /* <nanny>same as above, but add hint about DateStyle</nanny> */
3748  ereport(ERROR,
3749  (errcode(ERRCODE_DATETIME_FIELD_OVERFLOW),
3750  errmsg("date/time field value out of range: \"%s\"",
3751  str),
3752  errhint("Perhaps you need a different \"datestyle\" setting.")));
3753  break;
3754  case DTERR_INTERVAL_OVERFLOW:
3755  ereport(ERROR,
3756  (errcode(ERRCODE_INTERVAL_FIELD_OVERFLOW),
3757  errmsg("interval field value out of range: \"%s\"",
3758  str)));
3759  break;
3760  case DTERR_TZDISP_OVERFLOW:
3761  ereport(ERROR,
3762  (errcode(ERRCODE_INVALID_TIME_ZONE_DISPLACEMENT_VALUE),
3763  errmsg("time zone displacement out of range: \"%s\"",
3764  str)));
3765  break;
3766  case DTERR_BAD_FORMAT:
3767  default:
3768  ereport(ERROR,
3769  (errcode(ERRCODE_INVALID_DATETIME_FORMAT),
3770  errmsg("invalid input syntax for type %s: \"%s\"",
3771  datatype, str)));
3772  break;
3773  }
3774 }
3775 
3776 /* datebsearch()
3777  * Binary search -- from Knuth (6.2.1) Algorithm B. Special case like this
3778  * is WAY faster than the generic bsearch().
3779  */
3780 static const datetkn *
3781 datebsearch(const char *key, const datetkn *base, int nel)
3782 {
3783  if (nel > 0)
3784  {
3785  const datetkn *last = base + nel - 1,
3786  *position;
3787  int result;
3788 
3789  while (last >= base)
3790  {
3791  position = base + ((last - base) >> 1);
3792  /* precheck the first character for a bit of extra speed */
3793  result = (int) key[0] - (int) position->token[0];
3794  if (result == 0)
3795  {
3796  /* use strncmp so that we match truncated tokens */
3797  result = strncmp(key, position->token, TOKMAXLEN);
3798  if (result == 0)
3799  return position;
3800  }
3801  if (result < 0)
3802  last = position - 1;
3803  else
3804  base = position + 1;
3805  }
3806  }
3807  return NULL;
3808 }
3809 
3810 /* EncodeTimezone()
3811  * Copies representation of a numeric timezone offset to str.
3812  *
3813  * Returns a pointer to the new end of string. No NUL terminator is put
3814  * there; callers are responsible for NUL terminating str themselves.
3815  */
3816 static char *
3817 EncodeTimezone(char *str, int tz, int style)
3818 {
3819  int hour,
3820  min,
3821  sec;
3822 
3823  sec = abs(tz);
3824  min = sec / SECS_PER_MINUTE;
3825  sec -= min * SECS_PER_MINUTE;
3826  hour = min / MINS_PER_HOUR;
3827  min -= hour * MINS_PER_HOUR;
3828 
3829  /* TZ is negated compared to sign we wish to display ... */
3830  *str++ = (tz <= 0 ? '+' : '-');
3831 
3832  if (sec != 0)
3833  {
3834  str = pg_ltostr_zeropad(str, hour, 2);
3835  *str++ = ':';
3836  str = pg_ltostr_zeropad(str, min, 2);
3837  *str++ = ':';
3838  str = pg_ltostr_zeropad(str, sec, 2);
3839  }
3840  else if (min != 0 || style == USE_XSD_DATES)
3841  {
3842  str = pg_ltostr_zeropad(str, hour, 2);
3843  *str++ = ':';
3844  str = pg_ltostr_zeropad(str, min, 2);
3845  }
3846  else
3847  str = pg_ltostr_zeropad(str, hour, 2);
3848  return str;
3849 }
3850 
3851 /* EncodeDateOnly()
3852  * Encode date as local time.
3853  */
3854 void
3855 EncodeDateOnly(struct pg_tm *tm, int style, char *str)
3856 {
3857  Assert(tm->tm_mon >= 1 && tm->tm_mon <= MONTHS_PER_YEAR);
3858 
3859  switch (style)
3860  {
3861  case USE_ISO_DATES:
3862  case USE_XSD_DATES:
3863  /* compatible with ISO date formats */
3864  str = pg_ltostr_zeropad(str,
3865  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
3866  *str++ = '-';
3867  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3868  *str++ = '-';
3869  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3870  break;
3871 
3872  case USE_SQL_DATES:
3873  /* compatible with Oracle/Ingres date formats */
3874  if (DateOrder == DATEORDER_DMY)
3875  {
3876  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3877  *str++ = '/';
3878  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3879  }
3880  else
3881  {
3882  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3883  *str++ = '/';
3884  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3885  }
3886  *str++ = '/';
3887  str = pg_ltostr_zeropad(str,
3888  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
3889  break;
3890 
3891  case USE_GERMAN_DATES:
3892  /* German-style date format */
3893  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3894  *str++ = '.';
3895  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3896  *str++ = '.';
3897  str = pg_ltostr_zeropad(str,
3898  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
3899  break;
3900 
3901  case USE_POSTGRES_DATES:
3902  default:
3903  /* traditional date-only style for Postgres */
3904  if (DateOrder == DATEORDER_DMY)
3905  {
3906  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3907  *str++ = '-';
3908  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3909  }
3910  else
3911  {
3912  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3913  *str++ = '-';
3914  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3915  }
3916  *str++ = '-';
3917  str = pg_ltostr_zeropad(str,
3918  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
3919  break;
3920  }
3921 
3922  if (tm->tm_year <= 0)
3923  {
3924  memcpy(str, " BC", 3); /* Don't copy NUL */
3925  str += 3;
3926  }
3927  *str = '\0';
3928 }
3929 
3930 
3931 /* EncodeTimeOnly()
3932  * Encode time fields only.
3933  *
3934  * tm and fsec are the value to encode, print_tz determines whether to include
3935  * a time zone (the difference between time and timetz types), tz is the
3936  * numeric time zone offset, style is the date style, str is where to write the
3937  * output.
3938  */
3939 void
3940 EncodeTimeOnly(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, int style, char *str)
3941 {
3942  str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
3943  *str++ = ':';
3944  str = pg_ltostr_zeropad(str, tm->tm_min, 2);
3945  *str++ = ':';
3946  str = AppendSeconds(str, tm->tm_sec, fsec, MAX_TIME_PRECISION, true);
3947  if (print_tz)
3948  str = EncodeTimezone(str, tz, style);
3949  *str = '\0';
3950 }
3951 
3952 
3953 /* EncodeDateTime()
3954  * Encode date and time interpreted as local time.
3955  *
3956  * tm and fsec are the value to encode, print_tz determines whether to include
3957  * a time zone (the difference between timestamp and timestamptz types), tz is
3958  * the numeric time zone offset, tzn is the textual time zone, which if
3959  * specified will be used instead of tz by some styles, style is the date
3960  * style, str is where to write the output.
3961  *
3962  * Supported date styles:
3963  * Postgres - day mon hh:mm:ss yyyy tz
3964  * SQL - mm/dd/yyyy hh:mm:ss.ss tz
3965  * ISO - yyyy-mm-dd hh:mm:ss+/-tz
3966  * German - dd.mm.yyyy hh:mm:ss tz
3967  * XSD - yyyy-mm-ddThh:mm:ss.ss+/-tz
3968  */
3969 void
3970 EncodeDateTime(struct pg_tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str)
3971 {
3972  int day;
3973 
3974  Assert(tm->tm_mon >= 1 && tm->tm_mon <= MONTHS_PER_YEAR);
3975 
3976  /*
3977  * Negative tm_isdst means we have no valid time zone translation.
3978  */
3979  if (tm->tm_isdst < 0)
3980  print_tz = false;
3981 
3982  switch (style)
3983  {
3984  case USE_ISO_DATES:
3985  case USE_XSD_DATES:
3986  /* Compatible with ISO-8601 date formats */
3987  str = pg_ltostr_zeropad(str,
3988  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
3989  *str++ = '-';
3990  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
3991  *str++ = '-';
3992  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
3993  *str++ = (style == USE_ISO_DATES) ? ' ' : 'T';
3994  str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
3995  *str++ = ':';
3996  str = pg_ltostr_zeropad(str, tm->tm_min, 2);
3997  *str++ = ':';
3998  str = AppendTimestampSeconds(str, tm, fsec);
3999  if (print_tz)
4000  str = EncodeTimezone(str, tz, style);
4001  break;
4002 
4003  case USE_SQL_DATES:
4004  /* Compatible with Oracle/Ingres date formats */
4005  if (DateOrder == DATEORDER_DMY)
4006  {
4007  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
4008  *str++ = '/';
4009  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
4010  }
4011  else
4012  {
4013  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
4014  *str++ = '/';
4015  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
4016  }
4017  *str++ = '/';
4018  str = pg_ltostr_zeropad(str,
4019  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
4020  *str++ = ' ';
4021  str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
4022  *str++ = ':';
4023  str = pg_ltostr_zeropad(str, tm->tm_min, 2);
4024  *str++ = ':';
4025  str = AppendTimestampSeconds(str, tm, fsec);
4026 
4027  /*
4028  * Note: the uses of %.*s in this function would be risky if the
4029  * timezone names ever contain non-ASCII characters. However, all
4030  * TZ abbreviations in the IANA database are plain ASCII.
4031  */
4032  if (print_tz)
4033  {
4034  if (tzn)
4035  {
4036  sprintf(str, " %.*s", MAXTZLEN, tzn);
4037  str += strlen(str);
4038  }
4039  else
4040  str = EncodeTimezone(str, tz, style);
4041  }
4042  break;
4043 
4044  case USE_GERMAN_DATES:
4045  /* German variant on European style */
4046  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
4047  *str++ = '.';
4048  str = pg_ltostr_zeropad(str, tm->tm_mon, 2);
4049  *str++ = '.';
4050  str = pg_ltostr_zeropad(str,
4051  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
4052  *str++ = ' ';
4053  str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
4054  *str++ = ':';
4055  str = pg_ltostr_zeropad(str, tm->tm_min, 2);
4056  *str++ = ':';
4057  str = AppendTimestampSeconds(str, tm, fsec);
4058 
4059  if (print_tz)
4060  {
4061  if (tzn)
4062  {
4063  sprintf(str, " %.*s", MAXTZLEN, tzn);
4064  str += strlen(str);
4065  }
4066  else
4067  str = EncodeTimezone(str, tz, style);
4068  }
4069  break;
4070 
4071  case USE_POSTGRES_DATES:
4072  default:
4073  /* Backward-compatible with traditional Postgres abstime dates */
4074  day = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday);
4075  tm->tm_wday = j2day(day);
4076  memcpy(str, days[tm->tm_wday], 3);
4077  str += 3;
4078  *str++ = ' ';
4079  if (DateOrder == DATEORDER_DMY)
4080  {
4081  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
4082  *str++ = ' ';
4083  memcpy(str, months[tm->tm_mon - 1], 3);
4084  str += 3;
4085  }
4086  else
4087  {
4088  memcpy(str, months[tm->tm_mon - 1], 3);
4089  str += 3;
4090  *str++ = ' ';
4091  str = pg_ltostr_zeropad(str, tm->tm_mday, 2);
4092  }
4093  *str++ = ' ';
4094  str = pg_ltostr_zeropad(str, tm->tm_hour, 2);
4095  *str++ = ':';
4096  str = pg_ltostr_zeropad(str, tm->tm_min, 2);
4097  *str++ = ':';
4098  str = AppendTimestampSeconds(str, tm, fsec);
4099  *str++ = ' ';
4100  str = pg_ltostr_zeropad(str,
4101  (tm->tm_year > 0) ? tm->tm_year : -(tm->tm_year - 1), 4);
4102 
4103  if (print_tz)
4104  {
4105  if (tzn)
4106  {
4107  sprintf(str, " %.*s", MAXTZLEN, tzn);
4108  str += strlen(str);
4109  }
4110  else
4111  {
4112  /*
4113  * We have a time zone, but no string version. Use the
4114  * numeric form, but be sure to include a leading space to
4115  * avoid formatting something which would be rejected by
4116  * the date/time parser later. - thomas 2001-10-19
4117  */
4118  *str++ = ' ';
4119  str = EncodeTimezone(str, tz, style);
4120  }
4121  }
4122  break;
4123  }
4124 
4125  if (tm->tm_year <= 0)
4126  {
4127  memcpy(str, " BC", 3); /* Don't copy NUL */
4128  str += 3;
4129  }
4130  *str = '\0';
4131 }
4132 
4133 
4134 /*
4135  * Helper functions to avoid duplicated code in EncodeInterval.
4136  */
4137 
4138 /* Append an ISO-8601-style interval field, but only if value isn't zero */
4139 static char *
4140 AddISO8601IntPart(char *cp, int value, char units)
4141 {
4142  if (value == 0)
4143  return cp;
4144  sprintf(cp, "%d%c", value, units);
4145  return cp + strlen(cp);
4146 }
4147 
4148 /* Append a postgres-style interval field, but only if value isn't zero */
4149 static char *
4150 AddPostgresIntPart(char *cp, int value, const char *units,
4151  bool *is_zero, bool *is_before)
4152 {
4153  if (value == 0)
4154  return cp;
4155  sprintf(cp, "%s%s%d %s%s",
4156  (!*is_zero) ? " " : "",
4157  (*is_before && value > 0) ? "+" : "",
4158  value,
4159  units,
4160  (value != 1) ? "s" : "");
4161 
4162  /*
4163  * Each nonzero field sets is_before for (only) the next one. This is a
4164  * tad bizarre but it's how it worked before...
4165  */
4166  *is_before = (value < 0);
4167  *is_zero = false;
4168  return cp + strlen(cp);
4169 }
4170 
4171 /* Append a verbose-style interval field, but only if value isn't zero */
4172 static char *
4173 AddVerboseIntPart(char *cp, int value, const char *units,
4174  bool *is_zero, bool *is_before)
4175 {
4176  if (value == 0)
4177  return cp;
4178  /* first nonzero value sets is_before */
4179  if (*is_zero)
4180  {
4181  *is_before = (value < 0);
4182  value = abs(value);
4183  }
4184  else if (*is_before)
4185  value = -value;
4186  sprintf(cp, " %d %s%s", value, units, (value == 1) ? "" : "s");
4187  *is_zero = false;
4188  return cp + strlen(cp);
4189 }
4190 
4191 
4192 /* EncodeInterval()
4193  * Interpret time structure as a delta time and convert to string.
4194  *
4195  * Support "traditional Postgres" and ISO-8601 styles.
4196  * Actually, afaik ISO does not address time interval formatting,
4197  * but this looks similar to the spec for absolute date/time.
4198  * - thomas 1998-04-30
4199  *
4200  * Actually, afaik, ISO 8601 does specify formats for "time
4201  * intervals...[of the]...format with time-unit designators", which
4202  * are pretty ugly. The format looks something like
4203  * P1Y1M1DT1H1M1.12345S
4204  * but useful for exchanging data with computers instead of humans.
4205  * - ron 2003-07-14
4206  *
4207  * And ISO's SQL 2008 standard specifies standards for
4208  * "year-month literal"s (that look like '2-3') and
4209  * "day-time literal"s (that look like ('4 5:6:7')
4210  */
4211 void
4212 EncodeInterval(struct pg_tm *tm, fsec_t fsec, int style, char *str)
4213 {
4214  char *cp = str;
4215  int year = tm->tm_year;
4216  int mon = tm->tm_mon;
4217  int mday = tm->tm_mday;
4218  int hour = tm->tm_hour;
4219  int min = tm->tm_min;
4220  int sec = tm->tm_sec;
4221  bool is_before = false;
4222  bool is_zero = true;
4223 
4224  /*
4225  * The sign of year and month are guaranteed to match, since they are
4226  * stored internally as "month". But we'll need to check for is_before and
4227  * is_zero when determining the signs of day and hour/minute/seconds
4228  * fields.
4229  */
4230  switch (style)
4231  {
4232  /* SQL Standard interval format */
4233  case INTSTYLE_SQL_STANDARD:
4234  {
4235  bool has_negative = year < 0 || mon < 0 ||
4236  mday < 0 || hour < 0 ||
4237  min < 0 || sec < 0 || fsec < 0;
4238  bool has_positive = year > 0 || mon > 0 ||
4239  mday > 0 || hour > 0 ||
4240  min > 0 || sec > 0 || fsec > 0;
4241  bool has_year_month = year != 0 || mon != 0;
4242  bool has_day_time = mday != 0 || hour != 0 ||
4243  min != 0 || sec != 0 || fsec != 0;
4244  bool has_day = mday != 0;
4245  bool sql_standard_value = !(has_negative && has_positive) &&
4246  !(has_year_month && has_day_time);
4247 
4248  /*
4249  * SQL Standard wants only 1 "<sign>" preceding the whole
4250  * interval ... but can't do that if mixed signs.
4251  */
4252  if (has_negative && sql_standard_value)
4253  {
4254  *cp++ = '-';
4255  year = -year;
4256  mon = -mon;
4257  mday = -mday;
4258  hour = -hour;
4259  min = -min;
4260  sec = -sec;
4261  fsec = -fsec;
4262  }
4263 
4264  if (!has_negative && !has_positive)
4265  {
4266  sprintf(cp, "0");
4267  }
4268  else if (!sql_standard_value)
4269  {
4270  /*
4271  * For non sql-standard interval values, force outputting
4272  * the signs to avoid ambiguities with intervals with
4273  * mixed sign components.
4274  */
4275  char year_sign = (year < 0 || mon < 0) ? '-' : '+';
4276  char day_sign = (mday < 0) ? '-' : '+';
4277  char sec_sign = (hour < 0 || min < 0 ||
4278  sec < 0 || fsec < 0) ? '-' : '+';
4279 
4280  sprintf(cp, "%c%d-%d %c%d %c%d:%02d:",
4281  year_sign, abs(year), abs(mon),
4282  day_sign, abs(mday),
4283  sec_sign, abs(hour), abs(min));
4284  cp += strlen(cp);
4285  cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
4286  *cp = '\0';
4287  }
4288  else if (has_year_month)
4289  {
4290  sprintf(cp, "%d-%d", year, mon);
4291  }
4292  else if (has_day)
4293  {
4294  sprintf(cp, "%d %d:%02d:", mday, hour, min);
4295  cp += strlen(cp);
4296  cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
4297  *cp = '\0';
4298  }
4299  else
4300  {
4301  sprintf(cp, "%d:%02d:", hour, min);
4302  cp += strlen(cp);
4303  cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
4304  *cp = '\0';
4305  }
4306  }
4307  break;
4308 
4309  /* ISO 8601 "time-intervals by duration only" */
4310  case INTSTYLE_ISO_8601:
4311  /* special-case zero to avoid printing nothing */
4312  if (year == 0 && mon == 0 && mday == 0 &&
4313  hour == 0 && min == 0 && sec == 0 && fsec == 0)
4314  {
4315  sprintf(cp, "PT0S");
4316  break;
4317  }
4318  *cp++ = 'P';
4319  cp = AddISO8601IntPart(cp, year, 'Y');
4320  cp = AddISO8601IntPart(cp, mon, 'M');
4321  cp = AddISO8601IntPart(cp, mday, 'D');
4322  if (hour != 0 || min != 0 || sec != 0 || fsec != 0)
4323  *cp++ = 'T';
4324  cp = AddISO8601IntPart(cp, hour, 'H');
4325  cp = AddISO8601IntPart(cp, min, 'M');
4326  if (sec != 0 || fsec != 0)
4327  {
4328  if (sec < 0 || fsec < 0)
4329  *cp++ = '-';
4330  cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, false);
4331  *cp++ = 'S';
4332  *cp++ = '\0';
4333  }
4334  break;
4335 
4336  /* Compatible with postgresql < 8.4 when DateStyle = 'iso' */
4337  case INTSTYLE_POSTGRES:
4338  cp = AddPostgresIntPart(cp, year, "year", &is_zero, &is_before);
4339 
4340  /*
4341  * Ideally we should spell out "month" like we do for "year" and
4342  * "day". However, for backward compatibility, we can't easily
4343  * fix this. bjm 2011-05-24
4344  */
4345  cp = AddPostgresIntPart(cp, mon, "mon", &is_zero, &is_before);
4346  cp = AddPostgresIntPart(cp, mday, "day", &is_zero, &is_before);
4347  if (is_zero || hour != 0 || min != 0 || sec != 0 || fsec != 0)
4348  {
4349  bool minus = (hour < 0 || min < 0 || sec < 0 || fsec < 0);
4350 
4351  sprintf(cp, "%s%s%02d:%02d:",
4352  is_zero ? "" : " ",
4353  (minus ? "-" : (is_before ? "+" : "")),
4354  abs(hour), abs(min));
4355  cp += strlen(cp);
4356  cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, true);
4357  *cp = '\0';
4358  }
4359  break;
4360 
4361  /* Compatible with postgresql < 8.4 when DateStyle != 'iso' */
4362  case INTSTYLE_POSTGRES_VERBOSE:
4363  default:
4364  strcpy(cp, "@");
4365  cp++;
4366  cp = AddVerboseIntPart(cp, year, "year", &is_zero, &is_before);
4367  cp = AddVerboseIntPart(cp, mon, "mon", &is_zero, &is_before);
4368  cp = AddVerboseIntPart(cp, mday, "day", &is_zero, &is_before);
4369  cp = AddVerboseIntPart(cp, hour, "hour", &is_zero, &is_before);
4370  cp = AddVerboseIntPart(cp, min, "min", &is_zero, &is_before);
4371  if (sec != 0 || fsec != 0)
4372  {
4373  *cp++ = ' ';
4374  if (sec < 0 || (sec == 0 && fsec < 0))
4375  {
4376  if (is_zero)
4377  is_before = true;
4378  else if (!is_before)
4379  *cp++ = '-';
4380  }
4381  else if (is_before)
4382  *cp++ = '-';
4383  cp = AppendSeconds(cp, sec, fsec, MAX_INTERVAL_PRECISION, false);
4384  sprintf(cp, " sec%s",
4385  (abs(sec) != 1 || fsec != 0) ? "s" : "");
4386  is_zero = false;
4387  }
4388  /* identically zero? then put in a unitless zero... */
4389  if (is_zero)
4390  strcat(cp, " 0");
4391  if (is_before)
4392  strcat(cp, " ago");
4393  break;
4394  }
4395 }
4396 
4397 
4398 /*
4399  * We've been burnt by stupid errors in the ordering of the datetkn tables
4400  * once too often. Arrange to check them during postmaster start.
4401  */
4402 static bool
4403 CheckDateTokenTable(const char *tablename, const datetkn *base, int nel)
4404 {
4405  bool ok = true;
4406  int i;
4407 
4408  for (i = 0; i < nel; i++)
4409  {
4410  /* check for token strings that don't fit */
4411  if (strlen(base[i].token) > TOKMAXLEN)
4412  {
4413  /* %.*s is safe since all our tokens are ASCII */
4414  elog(LOG, "token too long in %s table: \"%.*s\"",
4415  tablename,
4416  TOKMAXLEN + 1, base[i].token);
4417  ok = false;
4418  break; /* don't risk applying strcmp */
4419  }
4420  /* check for out of order */
4421  if (i > 0 &&
4422  strcmp(base[i - 1].token, base[i].token) >= 0)
4423  {
4424  elog(LOG, "ordering error in %s table: \"%s\" >= \"%s\"",
4425  tablename,
4426  base[i - 1].token,
4427  base[i].token);
4428  ok = false;
4429  }
4430  }
4431  return ok;
4432 }
4433 
4434 bool
4435 CheckDateTokenTables(void)
4436 {
4437  bool ok = true;
4438 
4439  Assert(UNIX_EPOCH_JDATE == date2j(1970, 1, 1));
4440  Assert(POSTGRES_EPOCH_JDATE == date2j(2000, 1, 1));
4441 
4442  ok &= CheckDateTokenTable("datetktbl", datetktbl, szdatetktbl);
4443  ok &= CheckDateTokenTable("deltatktbl", deltatktbl, szdeltatktbl);
4444  return ok;
4445 }
4446 
4447 /*
4448  * Common code for temporal prosupport functions: simplify, if possible,
4449  * a call to a temporal type's length-coercion function.
4450  *
4451  * Types time, timetz, timestamp and timestamptz each have a range of allowed
4452  * precisions. An unspecified precision is rigorously equivalent to the
4453  * highest specifiable precision. We can replace the function call with a
4454  * no-op RelabelType if it is coercing to the same or higher precision as the
4455  * input is known to have.
4456  *
4457  * The input Node is always a FuncExpr, but to reduce the #include footprint
4458  * of datetime.h, we declare it as Node *.
4459  *
4460  * Note: timestamp_scale throws an error when the typmod is out of range, but
4461  * we can't get there from a cast: our typmodin will have caught it already.
4462  */
4463 Node *
4464 TemporalSimplify(int32 max_precis, Node *node)
4465 {
4466  FuncExpr *expr = castNode(FuncExpr, node);
4467  Node *ret = NULL;
4468  Node *typmod;
4469 
4470  Assert(list_length(expr->args) >= 2);
4471 
4472  typmod = (Node *) lsecond(expr->args);
4473 
4474  if (IsA(typmod, Const) &&!((Const *) typmod)->constisnull)
4475  {
4476  Node *source = (Node *) linitial(expr->args);
4477  int32 old_precis = exprTypmod(source);
4478  int32 new_precis = DatumGetInt32(((Const *) typmod)->constvalue);
4479 
4480  if (new_precis < 0 || new_precis == max_precis ||
4481  (old_precis >= 0 && new_precis >= old_precis))
4482  ret = relabel_to_typmod(source, new_precis);
4483  }
4484 
4485  return ret;
4486 }
4487 
4488 /*
4489  * This function gets called during timezone config file load or reload
4490  * to create the final array of timezone tokens. The argument array
4491  * is already sorted in name order.
4492  *
4493  * The result is a TimeZoneAbbrevTable (which must be a single malloc'd chunk)
4494  * or NULL on malloc failure. No other error conditions are defined.
4495  */
4496 TimeZoneAbbrevTable *
4497 ConvertTimeZoneAbbrevs(struct tzEntry *abbrevs, int n)
4498 {
4499  TimeZoneAbbrevTable *tbl;
4500  Size tbl_size;
4501  int i;
4502 
4503  /* Space for fixed fields and datetkn array */
4504  tbl_size = offsetof(TimeZoneAbbrevTable, abbrevs) +
4505  n * sizeof(datetkn);
4506  tbl_size = MAXALIGN(tbl_size);
4507  /* Count up space for dynamic abbreviations */
4508  for (i = 0; i < n; i++)
4509  {
4510  struct tzEntry *abbr = abbrevs + i;
4511 
4512  if (abbr->zone != NULL)
4513  {
4514  Size dsize;
4515 
4516  dsize = offsetof(DynamicZoneAbbrev, zone) +
4517  strlen(abbr->zone) + 1;
4518  tbl_size += MAXALIGN(dsize);
4519  }
4520  }
4521 
4522  /* Alloc the result ... */
4523  tbl = malloc(tbl_size);
4524  if (!tbl)
4525  return NULL;
4526 
4527  /* ... and fill it in */
4528  tbl->tblsize = tbl_size;
4529  tbl->numabbrevs = n;
4530  /* in this loop, tbl_size reprises the space calculation above */
4531  tbl_size = offsetof(TimeZoneAbbrevTable, abbrevs) +
4532  n * sizeof(datetkn);
4533  tbl_size = MAXALIGN(tbl_size);
4534  for (i = 0; i < n; i++)
4535  {
4536  struct tzEntry *abbr = abbrevs + i;
4537  datetkn *dtoken = tbl->abbrevs + i;
4538 
4539  /* use strlcpy to truncate name if necessary */
4540  strlcpy(dtoken->token, abbr->abbrev, TOKMAXLEN + 1);
4541  if (abbr->zone != NULL)
4542  {
4543  /* Allocate a DynamicZoneAbbrev for this abbreviation */
4544  DynamicZoneAbbrev *dtza;
4545  Size dsize;
4546 
4547  dtza = (DynamicZoneAbbrev *) ((char *) tbl + tbl_size);
4548  dtza->tz = NULL;
4549  strcpy(dtza->zone, abbr->zone);
4550 
4551  dtoken->type = DYNTZ;
4552  /* value is offset from table start to DynamicZoneAbbrev */
4553  dtoken->value = (int32) tbl_size;
4554 
4555  dsize = offsetof(DynamicZoneAbbrev, zone) +
4556  strlen(abbr->zone) + 1;
4557  tbl_size += MAXALIGN(dsize);
4558  }
4559  else
4560  {
4561  dtoken->type = abbr->is_dst ? DTZ : TZ;
4562  dtoken->value = abbr->offset;
4563  }
4564  }
4565 
4566  /* Assert the two loops above agreed on size calculations */
4567  Assert(tbl->tblsize == tbl_size);
4568 
4569  /* Check the ordering, if testing */
4570  Assert(CheckDateTokenTable("timezone abbreviations", tbl->abbrevs, n));
4571 
4572  return tbl;
4573 }
4574 
4575 /*
4576  * Install a TimeZoneAbbrevTable as the active table.
4577  *
4578  * Caller is responsible that the passed table doesn't go away while in use.
4579  */
4580 void
4581 InstallTimeZoneAbbrevs(TimeZoneAbbrevTable *tbl)
4582 {
4583  zoneabbrevtbl = tbl;
4584  /* reset abbrevcache, which may contain pointers into old table */
4585  memset(abbrevcache, 0, sizeof(abbrevcache));
4586 }
4587 
4588 /*
4589  * Helper subroutine to locate pg_tz timezone for a dynamic abbreviation.
4590  */
4591 static pg_tz *
4592 FetchDynamicTimeZone(TimeZoneAbbrevTable *tbl, const datetkn *tp)
4593 {
4594  DynamicZoneAbbrev *dtza;
4595 
4596  /* Just some sanity checks to prevent indexing off into nowhere */
4597  Assert(tp->type == DYNTZ);
4598  Assert(tp->value > 0 && tp->value < tbl->tblsize);
4599 
4600  dtza = (DynamicZoneAbbrev *) ((char *) tbl + tp->value);
4601 
4602  /* Look up the underlying zone if we haven't already */
4603  if (dtza->tz == NULL)
4604  {
4605  dtza->tz = pg_tzset(dtza->zone);
4606 
4607  /*
4608  * Ideally we'd let the caller ereport instead of doing it here, but
4609  * then there is no way to report the bad time zone name.
4610  */
4611  if (dtza->tz == NULL)
4612  ereport(ERROR,
4613  (errcode(ERRCODE_CONFIG_FILE_ERROR),
4614  errmsg("time zone \"%s\" not recognized",
4615  dtza->zone),
4616  errdetail("This time zone name appears in the configuration file for time zone abbreviation \"%s\".",
4617  tp->token)));
4618  }
4619  return dtza->tz;
4620 }
4621 
4622 
4623 /*
4624  * This set-returning function reads all the available time zone abbreviations
4625  * and returns a set of (abbrev, utc_offset, is_dst).
4626  */
4627 Datum
4628 pg_timezone_abbrevs(PG_FUNCTION_ARGS)
4629 {
4630  FuncCallContext *funcctx;
4631  int *pindex;
4632  Datum result;
4633  HeapTuple tuple;
4634  Datum values[3];
4635  bool nulls[3];
4636  const datetkn *tp;
4637  char buffer[TOKMAXLEN + 1];
4638  int gmtoffset;
4639  bool is_dst;
4640  unsigned char *p;
4641  struct pg_tm tm;
4642  Interval *resInterval;
4643 
4644  /* stuff done only on the first call of the function */
4645  if (SRF_IS_FIRSTCALL())
4646  {
4647  TupleDesc tupdesc;
4648  MemoryContext oldcontext;
4649 
4650  /* create a function context for cross-call persistence */
4651  funcctx = SRF_FIRSTCALL_INIT();
4652 
4653  /*
4654  * switch to memory context appropriate for multiple function calls
4655  */
4656  oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
4657 
4658  /* allocate memory for user context */
4659  pindex = (int *) palloc(sizeof(int));
4660  *pindex = 0;
4661  funcctx->user_fctx = (void *) pindex;
4662 
4663  /*
4664  * build tupdesc for result tuples. This must match this function's
4665  * pg_proc entry!
4666  */
4667  tupdesc = CreateTemplateTupleDesc(3);
4668  TupleDescInitEntry(tupdesc, (AttrNumber) 1, "abbrev",
4669  TEXTOID, -1, 0);
4670  TupleDescInitEntry(tupdesc, (AttrNumber) 2, "utc_offset",
4671  INTERVALOID, -1, 0);
4672  TupleDescInitEntry(tupdesc, (AttrNumber) 3, "is_dst",
4673  BOOLOID, -1, 0);
4674 
4675  funcctx->tuple_desc = BlessTupleDesc(tupdesc);
4676  MemoryContextSwitchTo(oldcontext);
4677  }
4678 
4679  /* stuff done on every call of the function */
4680  funcctx = SRF_PERCALL_SETUP();
4681  pindex = (int *) funcctx->user_fctx;
4682 
4683  if (zoneabbrevtbl == NULL ||
4684  *pindex >= zoneabbrevtbl->numabbrevs)
4685  SRF_RETURN_DONE(funcctx);
4686 
4687  tp = zoneabbrevtbl->abbrevs + *pindex;
4688 
4689  switch (tp->type)
4690  {
4691  case TZ:
4692  gmtoffset = tp->value;
4693  is_dst = false;
4694  break;
4695  case DTZ:
4696  gmtoffset = tp->value;
4697  is_dst = true;
4698  break;
4699  case DYNTZ:
4700  {
4701  /* Determine the current meaning of the abbrev */
4702  pg_tz *tzp;
4703  TimestampTz now;
4704  int isdst;
4705 
4706  tzp = FetchDynamicTimeZone(zoneabbrevtbl, tp);
4707  now = GetCurrentTransactionStartTimestamp();
4708  gmtoffset = -DetermineTimeZoneAbbrevOffsetTS(now,
4709  tp->token,
4710  tzp,
4711  &isdst);
4712  is_dst = (bool) isdst;
4713  break;
4714  }
4715  default:
4716  elog(ERROR, "unrecognized timezone type %d", (int) tp->type);
4717  gmtoffset = 0; /* keep compiler quiet */
4718  is_dst = false;
4719  break;
4720  }
4721 
4722  MemSet(nulls, 0, sizeof(nulls));
4723 
4724  /*
4725  * Convert name to text, using upcasing conversion that is the inverse of
4726  * what ParseDateTime() uses.
4727  */
4728  strlcpy(buffer, tp->token, sizeof(buffer));
4729  for (p = (unsigned char *) buffer; *p; p++)
4730  *p = pg_toupper(*p);
4731 
4732  values[0] = CStringGetTextDatum(buffer);
4733 
4734  /* Convert offset (in seconds) to an interval */
4735  MemSet(&tm, 0, sizeof(struct pg_tm));
4736  tm.tm_sec = gmtoffset;
4737  resInterval = (Interval *) palloc(sizeof(Interval));
4738  tm2interval(&tm, 0, resInterval);
4739  values[1] = IntervalPGetDatum(resInterval);
4740 
4741  values[2] = BoolGetDatum(is_dst);
4742 
4743  (*pindex)++;
4744 
4745  tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
4746  result = HeapTupleGetDatum(tuple);
4747 
4748  SRF_RETURN_NEXT(funcctx, result);
4749 }
4750 
4751 /*
4752  * This set-returning function reads all the available full time zones
4753  * and returns a set of (name, abbrev, utc_offset, is_dst).
4754  */
4755 Datum
4756 pg_timezone_names(PG_FUNCTION_ARGS)
4757 {
4758  MemoryContext oldcontext;
4759  FuncCallContext *funcctx;
4760  pg_tzenum *tzenum;
4761  pg_tz *tz;
4762  Datum result;
4763  HeapTuple tuple;
4764  Datum values[4];
4765  bool nulls[4];
4766  int tzoff;
4767  struct pg_tm tm;
4768  fsec_t fsec;
4769  const char *tzn;
4770  Interval *resInterval;
4771  struct pg_tm itm;
4772 
4773  /* stuff done only on the first call of the function */
4774  if (SRF_IS_FIRSTCALL())
4775  {
4776  TupleDesc tupdesc;
4777 
4778  /* create a function context for cross-call persistence */
4779  funcctx = SRF_FIRSTCALL_INIT();
4780 
4781  /*
4782  * switch to memory context appropriate for multiple function calls
4783  */
4784  oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
4785 
4786  /* initialize timezone scanning code */
4787  tzenum = pg_tzenumerate_start();
4788  funcctx->user_fctx = (void *) tzenum;
4789 
4790  /*
4791  * build tupdesc for result tuples. This must match this function's
4792  * pg_proc entry!
4793  */
4794  tupdesc = CreateTemplateTupleDesc(4);
4795  TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
4796  TEXTOID, -1, 0);
4797  TupleDescInitEntry(tupdesc, (AttrNumber) 2, "abbrev",
4798  TEXTOID, -1, 0);
4799  TupleDescInitEntry(tupdesc, (AttrNumber) 3, "utc_offset",
4800  INTERVALOID, -1, 0);
4801  TupleDescInitEntry(tupdesc, (AttrNumber) 4, "is_dst",
4802  BOOLOID, -1, 0);
4803 
4804  funcctx->tuple_desc = BlessTupleDesc(tupdesc);
4805  MemoryContextSwitchTo(oldcontext);
4806  }
4807 
4808  /* stuff done on every call of the function */
4809  funcctx = SRF_PERCALL_SETUP();
4810  tzenum = (pg_tzenum *) funcctx->user_fctx;
4811 
4812  /* search for another zone to display */
4813  for (;;)
4814  {
4815  oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
4816  tz = pg_tzenumerate_next(tzenum);
4817  MemoryContextSwitchTo(oldcontext);
4818 
4819  if (!tz)
4820  {
4821  pg_tzenumerate_end(tzenum);
4822  funcctx->user_fctx = NULL;
4823  SRF_RETURN_DONE(funcctx);
4824  }
4825 
4826  /* Convert now() to local time in this zone */
4827  if (timestamp2tm(GetCurrentTransactionStartTimestamp(),
4828  &tzoff, &tm, &fsec, &tzn, tz) != 0)
4829  continue; /* ignore if conversion fails */
4830 
4831  /*
4832  * IANA's rather silly "Factory" time zone used to emit ridiculously
4833  * long "abbreviations" such as "Local time zone must be set--see zic
4834  * manual page" or "Local time zone must be set--use tzsetup". While
4835  * modern versions of tzdb emit the much saner "-00", it seems some
4836  * benighted packagers are hacking the IANA data so that it continues
4837  * to produce these strings. To prevent producing a weirdly wide
4838  * abbrev column, reject ridiculously long abbreviations.
4839  */
4840  if (tzn && strlen(tzn) > 31)
4841  continue;
4842 
4843  /* Found a displayable zone */
4844  break;
4845  }
4846 
4847  MemSet(nulls, 0, sizeof(nulls));
4848 
4849  values[0] = CStringGetTextDatum(pg_get_timezone_name(tz));
4850  values[1] = CStringGetTextDatum(tzn ? tzn : "");
4851 
4852  MemSet(&itm, 0, sizeof(struct pg_tm));
4853  itm.tm_sec = -tzoff;
4854  resInterval = (Interval *) palloc(sizeof(Interval));
4855  tm2interval(&itm, 0, resInterval);
4856  values[2] = IntervalPGetDatum(resInterval);
4857 
4858  values[3] = BoolGetDatum(tm.tm_isdst > 0);
4859 
4860  tuple = heap_form_tuple(funcctx->tuple_desc, values, nulls);
4861  result = HeapTupleGetDatum(tuple);
4862 
4863  SRF_RETURN_NEXT(funcctx, result);
4864 }
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