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FFmpeg/libavformat/strptime.c

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  1. /* Convert a string representation of time to a time value.

  2.    Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.

  3.    This file is part of the GNU C Library.

  4.    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

  5. 

  6.    The GNU C Library is free software; you can redistribute it and/or

  7.    modify it under the terms of the GNU Library General Public License as

  8.    published by the Free Software Foundation; either version 2 of the

  9.    License, or (at your option) any later version.

  10. 

  11.    The GNU C Library is distributed in the hope that it will be useful,

  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.    Library General Public License for more details.

  15. 

  16.    You should have received a copy of the GNU Library General Public

  17.    License along with the GNU C Library; see the file COPYING.LIB.  If not,

  18.    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

  19.    Boston, MA 02111-1307, USA.  */

  20. 

  21. /* XXX This version of the implementation is not really complete.

  22.    Some of the fields cannot add information alone.  But if seeing

  23.    some of them in the same format (such as year, week and weekday)

  24.    this is enough information for determining the date.  */

  25. 

  26. #ifdef HAVE_CONFIG_H

  27. # include "config.h"

  28. #endif

  29. 

  30. #include <ctype.h>

  31. #include <limits.h>

  32. #include <string.h>

  33. #include <time.h>

  34. 

  35. #ifdef _LIBC

  36. # include "../locale/localeinfo.h"

  37. #endif

  38. 

  39. #include "strptime.h"

  40. 

  41. #ifndef __P

  42. # if defined (__GNUC__) || (defined (__STDC__) && __STDC__)

  43. #  define __P(args) args

  44. # else

  45. #  define __P(args) ()

  46. # endif  /* GCC.  */

  47. #endif  /* Not __P.  */

  48. 

  49. #if ! HAVE_LOCALTIME_R && ! defined localtime_r

  50. # ifdef _LIBC

  51. #  define localtime_r __localtime_r

  52. # else

  53. /* Approximate localtime_r as best we can in its absence.  */

  54. #  define localtime_r my_localtime_r

  55. static struct tm *localtime_r __P ((const time_t *, struct tm *));

  56. static struct tm *

  57. localtime_r (t, tp)

  58.      const time_t *t;

  59.      struct tm *tp;

  60. {

  61.   struct tm *l = localtime (t);

  62.   if (! l)

  63.     return 0;

  64.   *tp = *l;

  65.   return tp;

  66. }

  67. # endif /* ! _LIBC */

  68. #endif /* ! HAVE_LOCALTIME_R && ! defined (localtime_r) */

  69. 

  70. 

  71. #define match_char(ch1, ch2) if (ch1 != ch2) return NULL

  72. #if defined __GNUC__ && __GNUC__ >= 2

  73. # define match_string(cs1, s2) \

  74.   ({ size_t len = strlen (cs1);						      \

  75.      int result = strncasecmp ((cs1), (s2), len) == 0;			      \

  76.      if (result) (s2) += len;						      \

  77.      result; })

  78. #else

  79. /* Oh come on.  Get a reasonable compiler.  */

  80. # define match_string(cs1, s2) \

  81.   (strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))

  82. #endif

  83. /* We intentionally do not use isdigit() for testing because this will

  84.    lead to problems with the wide character version.  */

  85. #define get_number(from, to, n) \

  86.   do {									      \

  87.     int __n = n;							      \

  88.     val = 0;								      \

  89.     while (*rp == ' ')							      \

  90.       ++rp;								      \

  91.     if (*rp < '0' || *rp > '9')						      \

  92.       return NULL;							      \

  93.     do {								      \

  94.       val *= 10;							      \

  95.       val += *rp++ - '0';						      \

  96.     } while (--__n > 0 && val * 10 <= to && *rp >= '0' && *rp <= '9');	      \

  97.     if (val < from || val > to)						      \

  98.       return NULL;							      \

  99.   } while (0)

  100. #ifdef _NL_CURRENT

  101. # define get_alt_number(from, to, n) \

  102.   ({									      \

  103.     __label__ do_normal;						      \

  104.     if (*decided != raw)						      \

  105.       {									      \

  106. 	const char *alts = _NL_CURRENT (LC_TIME, ALT_DIGITS);		      \

  107. 	int __n = n;							      \

  108. 	int any = 0;							      \

  109. 	while (*rp == ' ')						      \

  110. 	  ++rp;								      \

  111. 	val = 0;							      \

  112. 	do {								      \

  113. 	  val *= 10;							      \

  114. 	  while (*alts != '\0')						      \

  115. 	    {								      \

  116. 	      size_t len = strlen (alts);				      \

  117. 	      if (strncasecmp (alts, rp, len) == 0)			      \

  118. 	        break;							      \

  119. 	      alts += len + 1;						      \

  120. 	      ++val;							      \

  121. 	    }								      \

  122. 	  if (*alts == '\0')						      \

  123. 	    {								      \

  124. 	      if (*decided == not && ! any)				      \

  125. 		goto do_normal;						      \

  126. 	      /* If we haven't read anything it's an error.  */		      \

  127. 	      if (! any)						      \

  128. 		return NULL;						      \

  129. 	      /* Correct the premature multiplication.  */		      \

  130. 	      val /= 10;						      \

  131. 	      break;							      \

  132. 	    }								      \

  133. 	  else								      \

  134. 	    *decided = loc;						      \

  135. 	} while (--__n > 0 && val * 10 <= to);				      \

  136. 	if (val < from || val > to)					      \

  137. 	  return NULL;							      \

  138.       }									      \

  139.     else								      \

  140.       {									      \

  141.        do_normal:							      \

  142.         get_number (from, to, n);					      \

  143.       }									      \

  144.     0;									      \

  145.   })

  146. #else

  147. # define get_alt_number(from, to, n) \

  148.   /* We don't have the alternate representation.  */			      \

  149.   get_number(from, to, n)

  150. #endif

  151. #define recursive(new_fmt) \

  152.   (*(new_fmt) != '\0'							      \

  153.    && (rp = strptime_internal (rp, (new_fmt), tm, decided, era_cnt)) != NULL)

  154. 

  155. 

  156. #ifdef _LIBC

  157. /* This is defined in locale/C-time.c in the GNU libc.  */

  158. extern const struct locale_data _nl_C_LC_TIME;

  159. extern const unsigned short int __mon_yday[2][13];

  160. 

  161. # define weekday_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (DAY_1)].string)

  162. # define ab_weekday_name \

  163.   (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)

  164. # define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)

  165. # define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)

  166. # define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)

  167. # define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_FMT)].string)

  168. # define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)

  169. # define HERE_PM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (PM_STR)].string)

  170. # define HERE_T_FMT_AMPM \

  171.   (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT_AMPM)].string)

  172. # define HERE_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT)].string)

  173. 

  174. # define strncasecmp(s1, s2, n) __strncasecmp (s1, s2, n)

  175. #else

  176. static char const weekday_name[][10] =

  177.   {

  178.     "Sunday", "Monday", "Tuesday", "Wednesday",

  179.     "Thursday", "Friday", "Saturday"

  180.   };

  181. static char const ab_weekday_name[][4] =

  182.   {

  183.     "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"

  184.   };

  185. static char const month_name[][10] =

  186.   {

  187.     "January", "February", "March", "April", "May", "June",

  188.     "July", "August", "September", "October", "November", "December"

  189.   };

  190. static char const ab_month_name[][4] =

  191.   {

  192.     "Jan", "Feb", "Mar", "Apr", "May", "Jun",

  193.     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"

  194.   };

  195. # define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"

  196. # define HERE_D_FMT "%m/%d/%y"

  197. # define HERE_AM_STR "AM"

  198. # define HERE_PM_STR "PM"

  199. # define HERE_T_FMT_AMPM "%I:%M:%S %p"

  200. # define HERE_T_FMT "%H:%M:%S"

  201. 

  202. const unsigned short int __mon_yday[2][13] =

  203.   {

  204.     /* Normal years.  */

  205.     { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },

  206.     /* Leap years.  */

  207.     { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }

  208.   };

  209. #endif

  210. 

  211. /* Status of lookup: do we use the locale data or the raw data?  */

  212. enum locale_status { not, loc, raw };

  213. 

  214. 

  215. #ifndef __isleap

  216. /* Nonzero if YEAR is a leap year (every 4 years,

  217.    except every 100th isn't, and every 400th is).  */

  218. # define __isleap(year)	\

  219.   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))

  220. #endif

  221. 

  222. /* Compute the day of the week.  */

  223. static void

  224. day_of_the_week (struct tm *tm)

  225. {

  226.   /* We know that January 1st 1970 was a Thursday (= 4).  Compute the

  227.      the difference between this data in the one on TM and so determine

  228.      the weekday.  */

  229.   int corr_year = 1900 + tm->tm_year - (tm->tm_mon < 2);

  230.   int wday = (-473

  231. 	      + (365 * (tm->tm_year - 70))

  232. 	      + (corr_year / 4)

  233. 	      - ((corr_year / 4) / 25) + ((corr_year / 4) % 25 < 0)

  234. 	      + (((corr_year / 4) / 25) / 4)

  235. 	      + __mon_yday[0][tm->tm_mon]

  236. 	      + tm->tm_mday - 1);

  237.   tm->tm_wday = ((wday % 7) + 7) % 7;

  238. }

  239. 

  240. /* Compute the day of the year.  */

  241. static void

  242. day_of_the_year (struct tm *tm)

  243. {

  244.   tm->tm_yday = (__mon_yday[__isleap (1900 + tm->tm_year)][tm->tm_mon]

  245. 		 + (tm->tm_mday - 1));

  246. }

  247. 

  248. static char *

  249. #ifdef _LIBC

  250. internal_function

  251. #endif

  252. strptime_internal __P ((const char *rp, const char *fmt, struct tm *tm,

  253. 			enum locale_status *decided, int era_cnt));

  254. 

  255. static char *

  256. #ifdef _LIBC

  257. internal_function

  258. #endif

  259. strptime_internal (rp, fmt, tm, decided, era_cnt)

  260.      const char *rp;

  261.      const char *fmt;

  262.      struct tm *tm;

  263.      enum locale_status *decided;

  264.      int era_cnt;

  265. {

  266.   const char *rp_backup;

  267.   int cnt;

  268.   size_t val;

  269.   int have_I, is_pm;

  270.   int century, want_century;

  271.   int want_era;

  272.   int have_wday, want_xday;

  273.   int have_yday;

  274.   int have_mon, have_mday;

  275. #ifdef _NL_CURRENT

  276.   size_t num_eras;

  277. #endif

  278.   struct era_entry *era;

  279. 

  280.   have_I = is_pm = 0;

  281.   century = -1;

  282.   want_century = 0;

  283.   want_era = 0;

  284.   era = NULL;

  285. 

  286.   have_wday = want_xday = have_yday = have_mon = have_mday = 0;

  287. 

  288.   while (*fmt != '\0')

  289.     {

  290.       /* A white space in the format string matches 0 more or white

  291. 	 space in the input string.  */

  292.       if (isspace (*fmt))

  293. 	{

  294. 	  while (isspace (*rp))

  295. 	    ++rp;

  296. 	  ++fmt;

  297. 	  continue;

  298. 	}

  299. 

  300.       /* Any character but `%' must be matched by the same character

  301. 	 in the iput string.  */

  302.       if (*fmt != '%')

  303. 	{

  304. 	  match_char (*fmt++, *rp++);

  305. 	  continue;

  306. 	}

  307. 

  308.       ++fmt;

  309. #ifndef _NL_CURRENT

  310.       /* We need this for handling the `E' modifier.  */

  311.     start_over:

  312. #endif

  313. 

  314.       /* Make back up of current processing pointer.  */

  315.       rp_backup = rp;

  316. 

  317.       switch (*fmt++)

  318. 	{

  319. 	case '%':

  320. 	  /* Match the `%' character itself.  */

  321. 	  match_char ('%', *rp++);

  322. 	  break;

  323. 	case 'a':

  324. 	case 'A':

  325. 	  /* Match day of week.  */

  326. 	  for (cnt = 0; cnt < 7; ++cnt)

  327. 	    {

  328. #ifdef _NL_CURRENT

  329. 	      if (*decided !=raw)

  330. 		{

  331. 		  if (match_string (_NL_CURRENT (LC_TIME, DAY_1 + cnt), rp))

  332. 		    {

  333. 		      if (*decided == not

  334. 			  && strcmp (_NL_CURRENT (LC_TIME, DAY_1 + cnt),

  335. 				     weekday_name[cnt]))

  336. 			*decided = loc;

  337. 		      break;

  338. 		    }

  339. 		  if (match_string (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt), rp))

  340. 		    {

  341. 		      if (*decided == not

  342. 			  && strcmp (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt),

  343. 				     ab_weekday_name[cnt]))

  344. 			*decided = loc;

  345. 		      break;

  346. 		    }

  347. 		}

  348. #endif

  349. 	      if (*decided != loc

  350. 		  && (match_string (weekday_name[cnt], rp)

  351. 		      || match_string (ab_weekday_name[cnt], rp)))

  352. 		{

  353. 		  *decided = raw;

  354. 		  break;

  355. 		}

  356. 	    }

  357. 	  if (cnt == 7)

  358. 	    /* Does not match a weekday name.  */

  359. 	    return NULL;

  360. 	  tm->tm_wday = cnt;

  361. 	  have_wday = 1;

  362. 	  break;

  363. 	case 'b':

  364. 	case 'B':

  365. 	case 'h':

  366. 	  /* Match month name.  */

  367. 	  for (cnt = 0; cnt < 12; ++cnt)

  368. 	    {

  369. #ifdef _NL_CURRENT

  370. 	      if (*decided !=raw)

  371. 		{

  372. 		  if (match_string (_NL_CURRENT (LC_TIME, MON_1 + cnt), rp))

  373. 		    {

  374. 		      if (*decided == not

  375. 			  && strcmp (_NL_CURRENT (LC_TIME, MON_1 + cnt),

  376. 				     month_name[cnt]))

  377. 			*decided = loc;

  378. 		      break;

  379. 		    }

  380. 		  if (match_string (_NL_CURRENT (LC_TIME, ABMON_1 + cnt), rp))

  381. 		    {

  382. 		      if (*decided == not

  383. 			  && strcmp (_NL_CURRENT (LC_TIME, ABMON_1 + cnt),

  384. 				     ab_month_name[cnt]))

  385. 			*decided = loc;

  386. 		      break;

  387. 		    }

  388. 		}

  389. #endif

  390. 	      if (match_string (month_name[cnt], rp)

  391. 		  || match_string (ab_month_name[cnt], rp))

  392. 		{

  393. 		  *decided = raw;

  394. 		  break;

  395. 		}

  396. 	    }

  397. 	  if (cnt == 12)

  398. 	    /* Does not match a month name.  */

  399. 	    return NULL;

  400. 	  tm->tm_mon = cnt;

  401. 	  want_xday = 1;

  402. 	  break;

  403. 	case 'c':

  404. 	  /* Match locale's date and time format.  */

  405. #ifdef _NL_CURRENT

  406. 	  if (*decided != raw)

  407. 	    {

  408. 	      if (!recursive (_NL_CURRENT (LC_TIME, D_T_FMT)))

  409. 		{

  410. 		  if (*decided == loc)

  411. 		    return NULL;

  412. 		  else

  413. 		    rp = rp_backup;

  414. 		}

  415. 	      else

  416. 		{

  417. 		  if (*decided == not &&

  418. 		      strcmp (_NL_CURRENT (LC_TIME, D_T_FMT), HERE_D_T_FMT))

  419. 		    *decided = loc;

  420. 		  want_xday = 1;

  421. 		  break;

  422. 		}

  423. 	      *decided = raw;

  424. 	    }

  425. #endif

  426. 	  if (!recursive (HERE_D_T_FMT))

  427. 	    return NULL;

  428. 	  want_xday = 1;

  429. 	  break;

  430. 	case 'C':

  431. 	  /* Match century number.  */

  432. #ifdef _NL_CURRENT

  433. 	match_century:

  434. #endif

  435. 	  get_number (0, 99, 2);

  436. 	  century = val;

  437. 	  want_xday = 1;

  438. 	  break;

  439. 	case 'd':

  440. 	case 'e':

  441. 	  /* Match day of month.  */

  442. 	  get_number (1, 31, 2);

  443. 	  tm->tm_mday = val;

  444. 	  have_mday = 1;

  445. 	  want_xday = 1;

  446. 	  break;

  447. 	case 'F':

  448. 	  if (!recursive ("%Y-%m-%d"))

  449. 	    return NULL;

  450. 	  want_xday = 1;

  451. 	  break;

  452. 	case 'x':

  453. #ifdef _NL_CURRENT

  454. 	  if (*decided != raw)

  455. 	    {

  456. 	      if (!recursive (_NL_CURRENT (LC_TIME, D_FMT)))

  457. 		{

  458. 		  if (*decided == loc)

  459. 		    return NULL;

  460. 		  else

  461. 		    rp = rp_backup;

  462. 		}

  463. 	      else

  464. 		{

  465. 		  if (*decided == not

  466. 		      && strcmp (_NL_CURRENT (LC_TIME, D_FMT), HERE_D_FMT))

  467. 		    *decided = loc;

  468. 		  want_xday = 1;

  469. 		  break;

  470. 		}

  471. 	      *decided = raw;

  472. 	    }

  473. #endif

  474. 	  /* Fall through.  */

  475. 	case 'D':

  476. 	  /* Match standard day format.  */

  477. 	  if (!recursive (HERE_D_FMT))

  478. 	    return NULL;

  479. 	  want_xday = 1;

  480. 	  break;

  481. 	case 'k':

  482. 	case 'H':

  483. 	  /* Match hour in 24-hour clock.  */

  484. 	  get_number (0, 23, 2);

  485. 	  tm->tm_hour = val;

  486. 	  have_I = 0;

  487. 	  break;

  488. 	case 'I':

  489. 	  /* Match hour in 12-hour clock.  */

  490. 	  get_number (1, 12, 2);

  491. 	  tm->tm_hour = val % 12;

  492. 	  have_I = 1;

  493. 	  break;

  494. 	case 'j':

  495. 	  /* Match day number of year.  */

  496. 	  get_number (1, 366, 3);

  497. 	  tm->tm_yday = val - 1;

  498. 	  have_yday = 1;

  499. 	  break;

  500. 	case 'm':

  501. 	  /* Match number of month.  */

  502. 	  get_number (1, 12, 2);

  503. 	  tm->tm_mon = val - 1;

  504. 	  have_mon = 1;

  505. 	  want_xday = 1;

  506. 	  break;

  507. 	case 'M':

  508. 	  /* Match minute.  */

  509. 	  get_number (0, 59, 2);

  510. 	  tm->tm_min = val;

  511. 	  break;

  512. 	case 'n':

  513. 	case 't':

  514. 	  /* Match any white space.  */

  515. 	  while (isspace (*rp))

  516. 	    ++rp;

  517. 	  break;

  518. 	case 'p':

  519. 	  /* Match locale's equivalent of AM/PM.  */

  520. #ifdef _NL_CURRENT

  521. 	  if (*decided != raw)

  522. 	    {

  523. 	      if (match_string (_NL_CURRENT (LC_TIME, AM_STR), rp))

  524. 		{

  525. 		  if (strcmp (_NL_CURRENT (LC_TIME, AM_STR), HERE_AM_STR))

  526. 		    *decided = loc;

  527. 		  break;

  528. 		}

  529. 	      if (match_string (_NL_CURRENT (LC_TIME, PM_STR), rp))

  530. 		{

  531. 		  if (strcmp (_NL_CURRENT (LC_TIME, PM_STR), HERE_PM_STR))

  532. 		    *decided = loc;

  533. 		  is_pm = 1;

  534. 		  break;

  535. 		}

  536. 	      *decided = raw;

  537. 	    }

  538. #endif

  539. 	  if (!match_string (HERE_AM_STR, rp))

  540. 	    if (match_string (HERE_PM_STR, rp))

  541. 	      is_pm = 1;

  542. 	    else

  543. 	      return NULL;

  544. 	  break;

  545. 	case 'r':

  546. #ifdef _NL_CURRENT

  547. 	  if (*decided != raw)

  548. 	    {

  549. 	      if (!recursive (_NL_CURRENT (LC_TIME, T_FMT_AMPM)))

  550. 		{

  551. 		  if (*decided == loc)

  552. 		    return NULL;

  553. 		  else

  554. 		    rp = rp_backup;

  555. 		}

  556. 	      else

  557. 		{

  558. 		  if (*decided == not &&

  559. 		      strcmp (_NL_CURRENT (LC_TIME, T_FMT_AMPM),

  560. 			      HERE_T_FMT_AMPM))

  561. 		    *decided = loc;

  562. 		  break;

  563. 		}

  564. 	      *decided = raw;

  565. 	    }

  566. #endif

  567. 	  if (!recursive (HERE_T_FMT_AMPM))

  568. 	    return NULL;

  569. 	  break;

  570. 	case 'R':

  571. 	  if (!recursive ("%H:%M"))

  572. 	    return NULL;

  573. 	  break;

  574. 	case 's':

  575. 	  {

  576. 	    /* The number of seconds may be very high so we cannot use

  577. 	       the `get_number' macro.  Instead read the number

  578. 	       character for character and construct the result while

  579. 	       doing this.  */

  580. 	    time_t secs = 0;

  581. 	    if (*rp < '0' || *rp > '9')

  582. 	      /* We need at least one digit.  */

  583. 	      return NULL;

  584. 

  585. 	    do

  586. 	      {

  587. 		secs *= 10;

  588. 		secs += *rp++ - '0';

  589. 	      }

  590. 	    while (*rp >= '0' && *rp <= '9');

  591. 

  592. 	    if (localtime_r (&secs, tm) == NULL)

  593. 	      /* Error in function.  */

  594. 	      return NULL;

  595. 	  }

  596. 	  break;

  597. 	case 'S':

  598. 	  get_number (0, 61, 2);

  599. 	  tm->tm_sec = val;

  600. 	  break;

  601. 	case 'X':

  602. #ifdef _NL_CURRENT

  603. 	  if (*decided != raw)

  604. 	    {

  605. 	      if (!recursive (_NL_CURRENT (LC_TIME, T_FMT)))

  606. 		{

  607. 		  if (*decided == loc)

  608. 		    return NULL;

  609. 		  else

  610. 		    rp = rp_backup;

  611. 		}

  612. 	      else

  613. 		{

  614. 		  if (strcmp (_NL_CURRENT (LC_TIME, T_FMT), HERE_T_FMT))

  615. 		    *decided = loc;

  616. 		  break;

  617. 		}

  618. 	      *decided = raw;

  619. 	    }

  620. #endif

  621. 	  /* Fall through.  */

  622. 	case 'T':

  623. 	  if (!recursive (HERE_T_FMT))

  624. 	    return NULL;

  625. 	  break;

  626. 	case 'u':

  627. 	  get_number (1, 7, 1);

  628. 	  tm->tm_wday = val % 7;

  629. 	  have_wday = 1;

  630. 	  break;

  631. 	case 'g':

  632. 	  get_number (0, 99, 2);

  633. 	  /* XXX This cannot determine any field in TM.  */

  634. 	  break;

  635. 	case 'G':

  636. 	  if (*rp < '0' || *rp > '9')

  637. 	    return NULL;

  638. 	  /* XXX Ignore the number since we would need some more

  639. 	     information to compute a real date.  */

  640. 	  do

  641. 	    ++rp;

  642. 	  while (*rp >= '0' && *rp <= '9');

  643. 	  break;

  644. 	case 'U':

  645. 	case 'V':

  646. 	case 'W':

  647. 	  get_number (0, 53, 2);

  648. 	  /* XXX This cannot determine any field in TM without some

  649. 	     information.  */

  650. 	  break;

  651. 	case 'w':

  652. 	  /* Match number of weekday.  */

  653. 	  get_number (0, 6, 1);

  654. 	  tm->tm_wday = val;

  655. 	  have_wday = 1;

  656. 	  break;

  657. 	case 'y':

  658. #ifdef _NL_CURRENT

  659. 	match_year_in_century:

  660. #endif

  661. 	  /* Match year within century.  */

  662. 	  get_number (0, 99, 2);

  663. 	  /* The "Year 2000: The Millennium Rollover" paper suggests that

  664. 	     values in the range 69-99 refer to the twentieth century.  */

  665. 	  tm->tm_year = val >= 69 ? val : val + 100;

  666. 	  /* Indicate that we want to use the century, if specified.  */

  667. 	  want_century = 1;

  668. 	  want_xday = 1;

  669. 	  break;

  670. 	case 'Y':

  671. 	  /* Match year including century number.  */

  672. 	  get_number (0, 9999, 4);

  673. 	  tm->tm_year = val - 1900;

  674. 	  want_century = 0;

  675. 	  want_xday = 1;

  676. 	  break;

  677. 	case 'Z':

  678. 	  /* XXX How to handle this?  */

  679. 	  break;

  680. 	case 'E':

  681. #ifdef _NL_CURRENT

  682. 	  switch (*fmt++)

  683. 	    {

  684. 	    case 'c':

  685. 	      /* Match locale's alternate date and time format.  */

  686. 	      if (*decided != raw)

  687. 		{

  688. 		  const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);

  689. 

  690. 		  if (*fmt == '\0')

  691. 		    fmt = _NL_CURRENT (LC_TIME, D_T_FMT);

  692. 

  693. 		  if (!recursive (fmt))

  694. 		    {

  695. 		      if (*decided == loc)

  696. 			return NULL;

  697. 		      else

  698. 			rp = rp_backup;

  699. 		    }

  700. 		  else

  701. 		    {

  702. 		      if (strcmp (fmt, HERE_D_T_FMT))

  703. 			*decided = loc;

  704. 		      want_xday = 1;

  705. 		      break;

  706. 		    }

  707. 		  *decided = raw;

  708. 		}

  709. 	      /* The C locale has no era information, so use the

  710. 		 normal representation.  */

  711. 	      if (!recursive (HERE_D_T_FMT))

  712. 		return NULL;

  713. 	      want_xday = 1;

  714. 	      break;

  715. 	    case 'C':

  716. 	      if (*decided != raw)

  717. 		{

  718. 		  if (era_cnt >= 0)

  719. 		    {

  720. 		      era = _nl_select_era_entry (era_cnt);

  721. 		      if (match_string (era->era_name, rp))

  722. 			{

  723. 			  *decided = loc;

  724. 			  break;

  725. 			}

  726. 		      else

  727. 			return NULL;

  728. 		    }

  729. 		  else

  730. 		    {

  731. 		      num_eras = _NL_CURRENT_WORD (LC_TIME,

  732. 						   _NL_TIME_ERA_NUM_ENTRIES);

  733. 		      for (era_cnt = 0; era_cnt < (int) num_eras;

  734. 			   ++era_cnt, rp = rp_backup)

  735. 			{

  736. 			  era = _nl_select_era_entry (era_cnt);

  737. 			  if (match_string (era->era_name, rp))

  738. 			    {

  739. 			      *decided = loc;

  740. 			      break;

  741. 			    }

  742. 			}

  743. 		      if (era_cnt == (int) num_eras)

  744. 			{

  745. 			  era_cnt = -1;

  746. 			  if (*decided == loc)

  747. 			    return NULL;

  748. 			}

  749. 		      else

  750. 			break;

  751. 		    }

  752. 

  753. 		  *decided = raw;

  754. 		}

  755. 	      /* The C locale has no era information, so use the

  756. 		 normal representation.  */

  757. 	      goto match_century;

  758.  	    case 'y':

  759. 	      if (*decided == raw)

  760. 		goto match_year_in_century;

  761. 

  762. 	      get_number(0, 9999, 4);

  763. 	      tm->tm_year = val;

  764. 	      want_era = 1;

  765. 	      want_xday = 1;

  766. 	      break;

  767. 	    case 'Y':

  768. 	      if (*decided != raw)

  769. 		{

  770. 		  num_eras = _NL_CURRENT_WORD (LC_TIME,

  771. 					       _NL_TIME_ERA_NUM_ENTRIES);

  772. 		  for (era_cnt = 0; era_cnt < (int) num_eras;

  773. 		       ++era_cnt, rp = rp_backup)

  774. 		    {

  775. 		      era = _nl_select_era_entry (era_cnt);

  776. 		      if (recursive (era->era_format))

  777. 			break;

  778. 		    }

  779. 		  if (era_cnt == (int) num_eras)

  780. 		    {

  781. 		      era_cnt = -1;

  782. 		      if (*decided == loc)

  783. 			return NULL;

  784. 		      else

  785. 			rp = rp_backup;

  786. 		    }

  787. 		  else

  788. 		    {

  789. 		      *decided = loc;

  790. 		      era_cnt = -1;

  791. 		      break;

  792. 		    }

  793. 

  794. 		  *decided = raw;

  795. 		}

  796. 	      get_number (0, 9999, 4);

  797. 	      tm->tm_year = val - 1900;

  798. 	      want_century = 0;

  799. 	      want_xday = 1;

  800. 	      break;

  801. 	    case 'x':

  802. 	      if (*decided != raw)

  803. 		{

  804. 		  const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);

  805. 

  806. 		  if (*fmt == '\0')

  807. 		    fmt = _NL_CURRENT (LC_TIME, D_FMT);

  808. 

  809. 		  if (!recursive (fmt))

  810. 		    {

  811. 		      if (*decided == loc)

  812. 			return NULL;

  813. 		      else

  814. 			rp = rp_backup;

  815. 		    }

  816. 		  else

  817. 		    {

  818. 		      if (strcmp (fmt, HERE_D_FMT))

  819. 			*decided = loc;

  820. 		      break;

  821. 		    }

  822. 		  *decided = raw;

  823. 		}

  824. 	      if (!recursive (HERE_D_FMT))

  825. 		return NULL;

  826. 	      break;

  827. 	    case 'X':

  828. 	      if (*decided != raw)

  829. 		{

  830. 		  const char *fmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);

  831. 

  832. 		  if (*fmt == '\0')

  833. 		    fmt = _NL_CURRENT (LC_TIME, T_FMT);

  834. 

  835. 		  if (!recursive (fmt))

  836. 		    {

  837. 		      if (*decided == loc)

  838. 			return NULL;

  839. 		      else

  840. 			rp = rp_backup;

  841. 		    }

  842. 		  else

  843. 		    {

  844. 		      if (strcmp (fmt, HERE_T_FMT))

  845. 			*decided = loc;

  846. 		      break;

  847. 		    }

  848. 		  *decided = raw;

  849. 		}

  850. 	      if (!recursive (HERE_T_FMT))

  851. 		return NULL;

  852. 	      break;

  853. 	    default:

  854. 	      return NULL;

  855. 	    }

  856. 	  break;

  857. #else

  858. 	  /* We have no information about the era format.  Just use

  859. 	     the normal format.  */

  860. 	  if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'

  861. 	      && *fmt != 'x' && *fmt != 'X')

  862. 	    /* This is an illegal format.  */

  863. 	    return NULL;

  864. 

  865. 	  goto start_over;

  866. #endif

  867. 	case 'O':

  868. 	  switch (*fmt++)

  869. 	    {

  870. 	    case 'd':

  871. 	    case 'e':

  872. 	      /* Match day of month using alternate numeric symbols.  */

  873. 	      get_alt_number (1, 31, 2);

  874. 	      tm->tm_mday = val;

  875. 	      have_mday = 1;

  876. 	      want_xday = 1;

  877. 	      break;

  878. 	    case 'H':

  879. 	      /* Match hour in 24-hour clock using alternate numeric

  880. 		 symbols.  */

  881. 	      get_alt_number (0, 23, 2);

  882. 	      tm->tm_hour = val;

  883. 	      have_I = 0;

  884. 	      break;

  885. 	    case 'I':

  886. 	      /* Match hour in 12-hour clock using alternate numeric

  887. 		 symbols.  */

  888. 	      get_alt_number (1, 12, 2);

  889. 	      tm->tm_hour = val - 1;

  890. 	      have_I = 1;

  891. 	      break;

  892. 	    case 'm':

  893. 	      /* Match month using alternate numeric symbols.  */

  894. 	      get_alt_number (1, 12, 2);

  895. 	      tm->tm_mon = val - 1;

  896. 	      have_mon = 1;

  897. 	      want_xday = 1;

  898. 	      break;

  899. 	    case 'M':

  900. 	      /* Match minutes using alternate numeric symbols.  */

  901. 	      get_alt_number (0, 59, 2);

  902. 	      tm->tm_min = val;

  903. 	      break;

  904. 	    case 'S':

  905. 	      /* Match seconds using alternate numeric symbols.  */

  906. 	      get_alt_number (0, 61, 2);

  907. 	      tm->tm_sec = val;

  908. 	      break;

  909. 	    case 'U':

  910. 	    case 'V':

  911. 	    case 'W':

  912. 	      get_alt_number (0, 53, 2);

  913. 	      /* XXX This cannot determine any field in TM without

  914. 		 further information.  */

  915. 	      break;

  916. 	    case 'w':

  917. 	      /* Match number of weekday using alternate numeric symbols.  */

  918. 	      get_alt_number (0, 6, 1);

  919. 	      tm->tm_wday = val;

  920. 	      have_wday = 1;

  921. 	      break;

  922. 	    case 'y':

  923. 	      /* Match year within century using alternate numeric symbols.  */

  924. 	      get_alt_number (0, 99, 2);

  925. 	      tm->tm_year = val >= 69 ? val : val + 100;

  926. 	      want_xday = 1;

  927. 	      break;

  928. 	    default:

  929. 	      return NULL;

  930. 	    }

  931. 	  break;

  932. 	default:

  933. 	  return NULL;

  934. 	}

  935.     }

  936. 

  937.   if (have_I && is_pm)

  938.     tm->tm_hour += 12;

  939. 

  940.   if (century != -1)

  941.     {

  942.       if (want_century)

  943. 	tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;

  944.       else

  945. 	/* Only the century, but not the year.  Strange, but so be it.  */

  946. 	tm->tm_year = (century - 19) * 100;

  947.     }

  948. 

  949. #ifdef _NL_CURRENT

  950.   if (era_cnt != -1)

  951.     {

  952.       era = _nl_select_era_entry(era_cnt);

  953.       if (want_era)

  954. 	tm->tm_year = (era->start_date[0]

  955. 		       + ((tm->tm_year - era->offset)

  956. 			  * era->absolute_direction));

  957.       else

  958. 	/* Era start year assumed.  */

  959. 	tm->tm_year = era->start_date[0];

  960.     }

  961.   else

  962. #endif

  963.     if (want_era)

  964.       return NULL;

  965. 

  966.   if (want_xday && !have_wday)

  967.     {

  968.       if ( !(have_mon && have_mday) && have_yday)

  969. 	{

  970. 	  /* We don't have tm_mon and/or tm_mday, compute them.  */

  971. 	  int t_mon = 0;

  972. 	  while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon] <= tm->tm_yday)

  973. 	      t_mon++;

  974. 	  if (!have_mon)

  975. 	      tm->tm_mon = t_mon - 1;

  976. 	  if (!have_mday)

  977. 	      tm->tm_mday =

  978. 		(tm->tm_yday

  979. 		 - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);

  980. 	}

  981.       day_of_the_week (tm);

  982.     }

  983.   if (want_xday && !have_yday)

  984.     day_of_the_year (tm);

  985. 

  986.   return (char *) rp;

  987. }

  988. 

  989. 

  990. char *

  991. strptime (buf, format, tm)

  992.      const char *buf;

  993.      const char *format;

  994.      struct tm *tm;

  995. {

  996.   enum locale_status decided;

  997. 

  998. #ifdef _NL_CURRENT

  999.   decided = not;

  1000. #else

  1001.   decided = raw;

  1002. #endif

  1003.   return strptime_internal (buf, format, tm, &decided, -1);

  1004. }