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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. #include "localtime_r.h"

  41. 

  42. #ifndef __P

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

  44. #  define __P(args) args

  45. # else

  46. #  define __P(args) ()

  47. # endif  /* GCC.  */

  48. #endif  /* Not __P.  */

  49. 

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

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

  52. # define match_string(cs1, s2) \

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

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

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

  56.      result; })

  57. #else

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

  59. # define match_string(cs1, s2) \

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

  61. #endif

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

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

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

  65.   do {									      \

  66.     int __n = n;							      \

  67.     val = 0;								      \

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

  69.       ++rp;								      \

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

  71.       return NULL;							      \

  72.     do {								      \

  73.       val *= 10;							      \

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

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

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

  77.       return NULL;							      \

  78.   } while (0)

  79. #ifdef _NL_CURRENT

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

  81.   ({									      \

  82.     __label__ do_normal;						      \

  83.     if (*decided != raw)						      \

  84.       {									      \

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

  86. 	int __n = n;							      \

  87. 	int any = 0;							      \

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

  89. 	  ++rp;								      \

  90. 	val = 0;							      \

  91. 	do {								      \

  92. 	  val *= 10;							      \

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

  94. 	    {								      \

  95. 	      size_t len = strlen (alts);				      \

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

  97. 	        break;							      \

  98. 	      alts += len + 1;						      \

  99. 	      ++val;							      \

  100. 	    }								      \

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

  102. 	    {								      \

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

  104. 		goto do_normal;						      \

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

  106. 	      if (! any)						      \

  107. 		return NULL;						      \

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

  109. 	      val /= 10;						      \

  110. 	      break;							      \

  111. 	    }								      \

  112. 	  else								      \

  113. 	    *decided = loc;						      \

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

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

  116. 	  return NULL;							      \

  117.       }									      \

  118.     else								      \

  119.       {									      \

  120.        do_normal:							      \

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

  122.       }									      \

  123.     0;									      \

  124.   })

  125. #else

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

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

  128.   get_number(from, to, n)

  129. #endif

  130. #define recursive(new_fmt) \

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

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

  133. 

  134. 

  135. #ifdef _LIBC

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

  137. extern const struct locale_data _nl_C_LC_TIME;

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

  139. 

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

  141. # define ab_weekday_name \

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

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

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

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

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

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

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

  149. # define HERE_T_FMT_AMPM \

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

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

  152. 

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

  154. #else

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

  156.   {

  157.     "Sunday", "Monday", "Tuesday", "Wednesday",

  158.     "Thursday", "Friday", "Saturday"

  159.   };

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

  161.   {

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

  163.   };

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

  165.   {

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

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

  168.   };

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

  170.   {

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

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

  173.   };

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

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

  176. # define HERE_AM_STR "AM"

  177. # define HERE_PM_STR "PM"

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

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

  180. 

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

  182.   {

  183.     /* Normal years.  */

  184.     { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },

  185.     /* Leap years.  */

  186.     { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }

  187.   };

  188. #endif

  189. 

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

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

  192. 

  193. 

  194. #ifndef __isleap

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

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

  197. # define __isleap(year)	\

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

  199. #endif

  200. 

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

  202. static void

  203. day_of_the_week (struct tm *tm)

  204. {

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

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

  207.      the weekday.  */

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

  209.   int wday = (-473

  210. 	      + (365 * (tm->tm_year - 70))

  211. 	      + (corr_year / 4)

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

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

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

  215. 	      + tm->tm_mday - 1);

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

  217. }

  218. 

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

  220. static void

  221. day_of_the_year (struct tm *tm)

  222. {

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

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

  225. }

  226. 

  227. static char *

  228. #ifdef _LIBC

  229. internal_function

  230. #endif

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

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

  233. 

  234. static char *

  235. #ifdef _LIBC

  236. internal_function

  237. #endif

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

  239.      const char *rp;

  240.      const char *fmt;

  241.      struct tm *tm;

  242.      enum locale_status *decided;

  243.      int era_cnt;

  244. {

  245.   const char *rp_backup;

  246.   int cnt;

  247.   size_t val;

  248.   int have_I, is_pm;

  249.   int century, want_century;

  250.   int want_era;

  251.   int have_wday, want_xday;

  252.   int have_yday;

  253.   int have_mon, have_mday;

  254. #ifdef _NL_CURRENT

  255.   size_t num_eras;

  256. #endif

  257.   struct era_entry *era;

  258. 

  259.   have_I = is_pm = 0;

  260.   century = -1;

  261.   want_century = 0;

  262.   want_era = 0;

  263.   era = NULL;

  264. 

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

  266. 

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

  268.     {

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

  270. 	 space in the input string.  */

  271.       if (isspace (*fmt))

  272. 	{

  273. 	  while (isspace (*rp))

  274. 	    ++rp;

  275. 	  ++fmt;

  276. 	  continue;

  277. 	}

  278. 

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

  280. 	 in the iput string.  */

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

  282. 	{

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

  284. 	  continue;

  285. 	}

  286. 

  287.       ++fmt;

  288. #ifndef _NL_CURRENT

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

  290.     start_over:

  291. #endif

  292. 

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

  294.       rp_backup = rp;

  295. 

  296.       switch (*fmt++)

  297. 	{

  298. 	case '%':

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

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

  301. 	  break;

  302. 	case 'a':

  303. 	case 'A':

  304. 	  /* Match day of week.  */

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

  306. 	    {

  307. #ifdef _NL_CURRENT

  308. 	      if (*decided !=raw)

  309. 		{

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

  311. 		    {

  312. 		      if (*decided == not

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

  314. 				     weekday_name[cnt]))

  315. 			*decided = loc;

  316. 		      break;

  317. 		    }

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

  319. 		    {

  320. 		      if (*decided == not

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

  322. 				     ab_weekday_name[cnt]))

  323. 			*decided = loc;

  324. 		      break;

  325. 		    }

  326. 		}

  327. #endif

  328. 	      if (*decided != loc

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

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

  331. 		{

  332. 		  *decided = raw;

  333. 		  break;

  334. 		}

  335. 	    }

  336. 	  if (cnt == 7)

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

  338. 	    return NULL;

  339. 	  tm->tm_wday = cnt;

  340. 	  have_wday = 1;

  341. 	  break;

  342. 	case 'b':

  343. 	case 'B':

  344. 	case 'h':

  345. 	  /* Match month name.  */

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

  347. 	    {

  348. #ifdef _NL_CURRENT

  349. 	      if (*decided !=raw)

  350. 		{

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

  352. 		    {

  353. 		      if (*decided == not

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

  355. 				     month_name[cnt]))

  356. 			*decided = loc;

  357. 		      break;

  358. 		    }

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

  360. 		    {

  361. 		      if (*decided == not

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

  363. 				     ab_month_name[cnt]))

  364. 			*decided = loc;

  365. 		      break;

  366. 		    }

  367. 		}

  368. #endif

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

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

  371. 		{

  372. 		  *decided = raw;

  373. 		  break;

  374. 		}

  375. 	    }

  376. 	  if (cnt == 12)

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

  378. 	    return NULL;

  379. 	  tm->tm_mon = cnt;

  380. 	  want_xday = 1;

  381. 	  break;

  382. 	case 'c':

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

  384. #ifdef _NL_CURRENT

  385. 	  if (*decided != raw)

  386. 	    {

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

  388. 		{

  389. 		  if (*decided == loc)

  390. 		    return NULL;

  391. 		  else

  392. 		    rp = rp_backup;

  393. 		}

  394. 	      else

  395. 		{

  396. 		  if (*decided == not &&

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

  398. 		    *decided = loc;

  399. 		  want_xday = 1;

  400. 		  break;

  401. 		}

  402. 	      *decided = raw;

  403. 	    }

  404. #endif

  405. 	  if (!recursive (HERE_D_T_FMT))

  406. 	    return NULL;

  407. 	  want_xday = 1;

  408. 	  break;

  409. 	case 'C':

  410. 	  /* Match century number.  */

  411. #ifdef _NL_CURRENT

  412. 	match_century:

  413. #endif

  414. 	  get_number (0, 99, 2);

  415. 	  century = val;

  416. 	  want_xday = 1;

  417. 	  break;

  418. 	case 'd':

  419. 	case 'e':

  420. 	  /* Match day of month.  */

  421. 	  get_number (1, 31, 2);

  422. 	  tm->tm_mday = val;

  423. 	  have_mday = 1;

  424. 	  want_xday = 1;

  425. 	  break;

  426. 	case 'F':

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

  428. 	    return NULL;

  429. 	  want_xday = 1;

  430. 	  break;

  431. 	case 'x':

  432. #ifdef _NL_CURRENT

  433. 	  if (*decided != raw)

  434. 	    {

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

  436. 		{

  437. 		  if (*decided == loc)

  438. 		    return NULL;

  439. 		  else

  440. 		    rp = rp_backup;

  441. 		}

  442. 	      else

  443. 		{

  444. 		  if (*decided == not

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

  446. 		    *decided = loc;

  447. 		  want_xday = 1;

  448. 		  break;

  449. 		}

  450. 	      *decided = raw;

  451. 	    }

  452. #endif

  453. 	  /* Fall through.  */

  454. 	case 'D':

  455. 	  /* Match standard day format.  */

  456. 	  if (!recursive (HERE_D_FMT))

  457. 	    return NULL;

  458. 	  want_xday = 1;

  459. 	  break;

  460. 	case 'k':

  461. 	case 'H':

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

  463. 	  get_number (0, 23, 2);

  464. 	  tm->tm_hour = val;

  465. 	  have_I = 0;

  466. 	  break;

  467. 	case 'I':

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

  469. 	  get_number (1, 12, 2);

  470. 	  tm->tm_hour = val % 12;

  471. 	  have_I = 1;

  472. 	  break;

  473. 	case 'j':

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

  475. 	  get_number (1, 366, 3);

  476. 	  tm->tm_yday = val - 1;

  477. 	  have_yday = 1;

  478. 	  break;

  479. 	case 'm':

  480. 	  /* Match number of month.  */

  481. 	  get_number (1, 12, 2);

  482. 	  tm->tm_mon = val - 1;

  483. 	  have_mon = 1;

  484. 	  want_xday = 1;

  485. 	  break;

  486. 	case 'M':

  487. 	  /* Match minute.  */

  488. 	  get_number (0, 59, 2);

  489. 	  tm->tm_min = val;

  490. 	  break;

  491. 	case 'n':

  492. 	case 't':

  493. 	  /* Match any white space.  */

  494. 	  while (isspace (*rp))

  495. 	    ++rp;

  496. 	  break;

  497. 	case 'p':

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

  499. #ifdef _NL_CURRENT

  500. 	  if (*decided != raw)

  501. 	    {

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

  503. 		{

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

  505. 		    *decided = loc;

  506. 		  break;

  507. 		}

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

  509. 		{

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

  511. 		    *decided = loc;

  512. 		  is_pm = 1;

  513. 		  break;

  514. 		}

  515. 	      *decided = raw;

  516. 	    }

  517. #endif

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

  519. 	    if (match_string (HERE_PM_STR, rp))

  520. 	      is_pm = 1;

  521. 	    else

  522. 	      return NULL;

  523. 	  break;

  524. 	case 'r':

  525. #ifdef _NL_CURRENT

  526. 	  if (*decided != raw)

  527. 	    {

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

  529. 		{

  530. 		  if (*decided == loc)

  531. 		    return NULL;

  532. 		  else

  533. 		    rp = rp_backup;

  534. 		}

  535. 	      else

  536. 		{

  537. 		  if (*decided == not &&

  538. 		      strcmp (_NL_CURRENT (LC_TIME, T_FMT_AMPM),

  539. 			      HERE_T_FMT_AMPM))

  540. 		    *decided = loc;

  541. 		  break;

  542. 		}

  543. 	      *decided = raw;

  544. 	    }

  545. #endif

  546. 	  if (!recursive (HERE_T_FMT_AMPM))

  547. 	    return NULL;

  548. 	  break;

  549. 	case 'R':

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

  551. 	    return NULL;

  552. 	  break;

  553. 	case 's':

  554. 	  {

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

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

  557. 	       character for character and construct the result while

  558. 	       doing this.  */

  559. 	    time_t secs = 0;

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

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

  562. 	      return NULL;

  563. 

  564. 	    do

  565. 	      {

  566. 		secs *= 10;

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

  568. 	      }

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

  570. 

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

  572. 	      /* Error in function.  */

  573. 	      return NULL;

  574. 	  }

  575. 	  break;

  576. 	case 'S':

  577. 	  get_number (0, 61, 2);

  578. 	  tm->tm_sec = val;

  579. 	  break;

  580. 	case 'X':

  581. #ifdef _NL_CURRENT

  582. 	  if (*decided != raw)

  583. 	    {

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

  585. 		{

  586. 		  if (*decided == loc)

  587. 		    return NULL;

  588. 		  else

  589. 		    rp = rp_backup;

  590. 		}

  591. 	      else

  592. 		{

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

  594. 		    *decided = loc;

  595. 		  break;

  596. 		}

  597. 	      *decided = raw;

  598. 	    }

  599. #endif

  600. 	  /* Fall through.  */

  601. 	case 'T':

  602. 	  if (!recursive (HERE_T_FMT))

  603. 	    return NULL;

  604. 	  break;

  605. 	case 'u':

  606. 	  get_number (1, 7, 1);

  607. 	  tm->tm_wday = val % 7;

  608. 	  have_wday = 1;

  609. 	  break;

  610. 	case 'g':

  611. 	  get_number (0, 99, 2);

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

  613. 	  break;

  614. 	case 'G':

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

  616. 	    return NULL;

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

  618. 	     information to compute a real date.  */

  619. 	  do

  620. 	    ++rp;

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

  622. 	  break;

  623. 	case 'U':

  624. 	case 'V':

  625. 	case 'W':

  626. 	  get_number (0, 53, 2);

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

  628. 	     information.  */

  629. 	  break;

  630. 	case 'w':

  631. 	  /* Match number of weekday.  */

  632. 	  get_number (0, 6, 1);

  633. 	  tm->tm_wday = val;

  634. 	  have_wday = 1;

  635. 	  break;

  636. 	case 'y':

  637. #ifdef _NL_CURRENT

  638. 	match_year_in_century:

  639. #endif

  640. 	  /* Match year within century.  */

  641. 	  get_number (0, 99, 2);

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

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

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

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

  646. 	  want_century = 1;

  647. 	  want_xday = 1;

  648. 	  break;

  649. 	case 'Y':

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

  651. 	  get_number (0, 9999, 4);

  652. 	  tm->tm_year = val - 1900;

  653. 	  want_century = 0;

  654. 	  want_xday = 1;

  655. 	  break;

  656. 	case 'Z':

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

  658. 	  break;

  659. 	case 'E':

  660. #ifdef _NL_CURRENT

  661. 	  switch (*fmt++)

  662. 	    {

  663. 	    case 'c':

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

  665. 	      if (*decided != raw)

  666. 		{

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

  668. 

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

  670. 		    fmt = _NL_CURRENT (LC_TIME, D_T_FMT);

  671. 

  672. 		  if (!recursive (fmt))

  673. 		    {

  674. 		      if (*decided == loc)

  675. 			return NULL;

  676. 		      else

  677. 			rp = rp_backup;

  678. 		    }

  679. 		  else

  680. 		    {

  681. 		      if (strcmp (fmt, HERE_D_T_FMT))

  682. 			*decided = loc;

  683. 		      want_xday = 1;

  684. 		      break;

  685. 		    }

  686. 		  *decided = raw;

  687. 		}

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

  689. 		 normal representation.  */

  690. 	      if (!recursive (HERE_D_T_FMT))

  691. 		return NULL;

  692. 	      want_xday = 1;

  693. 	      break;

  694. 	    case 'C':

  695. 	      if (*decided != raw)

  696. 		{

  697. 		  if (era_cnt >= 0)

  698. 		    {

  699. 		      era = _nl_select_era_entry (era_cnt);

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

  701. 			{

  702. 			  *decided = loc;

  703. 			  break;

  704. 			}

  705. 		      else

  706. 			return NULL;

  707. 		    }

  708. 		  else

  709. 		    {

  710. 		      num_eras = _NL_CURRENT_WORD (LC_TIME,

  711. 						   _NL_TIME_ERA_NUM_ENTRIES);

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

  713. 			   ++era_cnt, rp = rp_backup)

  714. 			{

  715. 			  era = _nl_select_era_entry (era_cnt);

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

  717. 			    {

  718. 			      *decided = loc;

  719. 			      break;

  720. 			    }

  721. 			}

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

  723. 			{

  724. 			  era_cnt = -1;

  725. 			  if (*decided == loc)

  726. 			    return NULL;

  727. 			}

  728. 		      else

  729. 			break;

  730. 		    }

  731. 

  732. 		  *decided = raw;

  733. 		}

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

  735. 		 normal representation.  */

  736. 	      goto match_century;

  737.  	    case 'y':

  738. 	      if (*decided == raw)

  739. 		goto match_year_in_century;

  740. 

  741. 	      get_number(0, 9999, 4);

  742. 	      tm->tm_year = val;

  743. 	      want_era = 1;

  744. 	      want_xday = 1;

  745. 	      break;

  746. 	    case 'Y':

  747. 	      if (*decided != raw)

  748. 		{

  749. 		  num_eras = _NL_CURRENT_WORD (LC_TIME,

  750. 					       _NL_TIME_ERA_NUM_ENTRIES);

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

  752. 		       ++era_cnt, rp = rp_backup)

  753. 		    {

  754. 		      era = _nl_select_era_entry (era_cnt);

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

  756. 			break;

  757. 		    }

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

  759. 		    {

  760. 		      era_cnt = -1;

  761. 		      if (*decided == loc)

  762. 			return NULL;

  763. 		      else

  764. 			rp = rp_backup;

  765. 		    }

  766. 		  else

  767. 		    {

  768. 		      *decided = loc;

  769. 		      era_cnt = -1;

  770. 		      break;

  771. 		    }

  772. 

  773. 		  *decided = raw;

  774. 		}

  775. 	      get_number (0, 9999, 4);

  776. 	      tm->tm_year = val - 1900;

  777. 	      want_century = 0;

  778. 	      want_xday = 1;

  779. 	      break;

  780. 	    case 'x':

  781. 	      if (*decided != raw)

  782. 		{

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

  784. 

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

  786. 		    fmt = _NL_CURRENT (LC_TIME, D_FMT);

  787. 

  788. 		  if (!recursive (fmt))

  789. 		    {

  790. 		      if (*decided == loc)

  791. 			return NULL;

  792. 		      else

  793. 			rp = rp_backup;

  794. 		    }

  795. 		  else

  796. 		    {

  797. 		      if (strcmp (fmt, HERE_D_FMT))

  798. 			*decided = loc;

  799. 		      break;

  800. 		    }

  801. 		  *decided = raw;

  802. 		}

  803. 	      if (!recursive (HERE_D_FMT))

  804. 		return NULL;

  805. 	      break;

  806. 	    case 'X':

  807. 	      if (*decided != raw)

  808. 		{

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

  810. 

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

  812. 		    fmt = _NL_CURRENT (LC_TIME, T_FMT);

  813. 

  814. 		  if (!recursive (fmt))

  815. 		    {

  816. 		      if (*decided == loc)

  817. 			return NULL;

  818. 		      else

  819. 			rp = rp_backup;

  820. 		    }

  821. 		  else

  822. 		    {

  823. 		      if (strcmp (fmt, HERE_T_FMT))

  824. 			*decided = loc;

  825. 		      break;

  826. 		    }

  827. 		  *decided = raw;

  828. 		}

  829. 	      if (!recursive (HERE_T_FMT))

  830. 		return NULL;

  831. 	      break;

  832. 	    default:

  833. 	      return NULL;

  834. 	    }

  835. 	  break;

  836. #else

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

  838. 	     the normal format.  */

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

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

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

  842. 	    return NULL;

  843. 

  844. 	  goto start_over;

  845. #endif

  846. 	case 'O':

  847. 	  switch (*fmt++)

  848. 	    {

  849. 	    case 'd':

  850. 	    case 'e':

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

  852. 	      get_alt_number (1, 31, 2);

  853. 	      tm->tm_mday = val;

  854. 	      have_mday = 1;

  855. 	      want_xday = 1;

  856. 	      break;

  857. 	    case 'H':

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

  859. 		 symbols.  */

  860. 	      get_alt_number (0, 23, 2);

  861. 	      tm->tm_hour = val;

  862. 	      have_I = 0;

  863. 	      break;

  864. 	    case 'I':

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

  866. 		 symbols.  */

  867. 	      get_alt_number (1, 12, 2);

  868. 	      tm->tm_hour = val - 1;

  869. 	      have_I = 1;

  870. 	      break;

  871. 	    case 'm':

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

  873. 	      get_alt_number (1, 12, 2);

  874. 	      tm->tm_mon = val - 1;

  875. 	      have_mon = 1;

  876. 	      want_xday = 1;

  877. 	      break;

  878. 	    case 'M':

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

  880. 	      get_alt_number (0, 59, 2);

  881. 	      tm->tm_min = val;

  882. 	      break;

  883. 	    case 'S':

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

  885. 	      get_alt_number (0, 61, 2);

  886. 	      tm->tm_sec = val;

  887. 	      break;

  888. 	    case 'U':

  889. 	    case 'V':

  890. 	    case 'W':

  891. 	      get_alt_number (0, 53, 2);

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

  893. 		 further information.  */

  894. 	      break;

  895. 	    case 'w':

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

  897. 	      get_alt_number (0, 6, 1);

  898. 	      tm->tm_wday = val;

  899. 	      have_wday = 1;

  900. 	      break;

  901. 	    case 'y':

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

  903. 	      get_alt_number (0, 99, 2);

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

  905. 	      want_xday = 1;

  906. 	      break;

  907. 	    default:

  908. 	      return NULL;

  909. 	    }

  910. 	  break;

  911. 	default:

  912. 	  return NULL;

  913. 	}

  914.     }

  915. 

  916.   if (have_I && is_pm)

  917.     tm->tm_hour += 12;

  918. 

  919.   if (century != -1)

  920.     {

  921.       if (want_century)

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

  923.       else

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

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

  926.     }

  927. 

  928. #ifdef _NL_CURRENT

  929.   if (era_cnt != -1)

  930.     {

  931.       era = _nl_select_era_entry(era_cnt);

  932.       if (want_era)

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

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

  935. 			  * era->absolute_direction));

  936.       else

  937. 	/* Era start year assumed.  */

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

  939.     }

  940.   else

  941. #endif

  942.     if (want_era)

  943.       return NULL;

  944. 

  945.   if (want_xday && !have_wday)

  946.     {

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

  948. 	{

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

  950. 	  int t_mon = 0;

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

  952. 	      t_mon++;

  953. 	  if (!have_mon)

  954. 	      tm->tm_mon = t_mon - 1;

  955. 	  if (!have_mday)

  956. 	      tm->tm_mday =

  957. 		(tm->tm_yday

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

  959. 	}

  960.       day_of_the_week (tm);

  961.     }

  962.   if (want_xday && !have_yday)

  963.     day_of_the_year (tm);

  964. 

  965.   return (char *) rp;

  966. }

  967. 

  968. 

  969. char *

  970. strptime (buf, format, tm)

  971.      const char *buf;

  972.      const char *format;

  973.      struct tm *tm;

  974. {

  975.   enum locale_status decided;

  976. 

  977. #ifdef _NL_CURRENT

  978.   decided = not;

  979. #else

  980.   decided = raw;

  981. #endif

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

  983. }