Add real implementation.
authordrepper <drepper>
Sun, 14 Mar 2004 21:03:08 +0000 (21:03 +0000)
committerdrepper <drepper>
Sun, 14 Mar 2004 21:03:08 +0000 (21:03 +0000)
time/strptime_l.c

index 6813860..b95f098 100644 (file)
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#define USE_IN_EXTENDED_LOCALE_MODEL 1
-#include <strptime.c>
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
 
+#include <ctype.h>
+#include <langinfo.h>
+#include <limits.h>
+#include <string.h>
+#include <time.h>
+
+#ifdef _LIBC
+# include "../locale/localeinfo.h"
+#endif
+
+
+#ifndef __P
+# if defined __GNUC__ || (defined __STDC__ && __STDC__)
+#  define __P(args) args
+# else
+#  define __P(args) ()
+# endif  /* GCC.  */
+#endif  /* Not __P.  */
+
+
+#if ! HAVE_LOCALTIME_R && ! defined localtime_r
+# ifdef _LIBC
+#  define localtime_r __localtime_r
+# else
+/* Approximate localtime_r as best we can in its absence.  */
+#  define localtime_r my_localtime_r
+static struct tm *localtime_r __P ((const time_t *, struct tm *));
+static struct tm *
+localtime_r (t, tp)
+     const time_t *t;
+     struct tm *tp;
+{
+  struct tm *l = localtime (t);
+  if (! l)
+    return 0;
+  *tp = *l;
+  return tp;
+}
+# endif /* ! _LIBC */
+#endif /* ! HAVE_LOCALTIME_R && ! defined (localtime_r) */
+
+
+#define match_char(ch1, ch2) if (ch1 != ch2) return NULL
+#if defined __GNUC__ && __GNUC__ >= 2
+# define match_string(cs1, s2) \
+  ({ size_t len = strlen (cs1);                                                      \
+     int result = __strncasecmp_l ((cs1), (s2), len, locale) == 0;           \
+     if (result) (s2) += len;                                                \
+     result; })
+#else
+/* Oh come on.  Get a reasonable compiler.  */
+# define match_string(cs1, s2) \
+  (strncasecmp ((cs1), (s2), strlen (cs1)) ? 0 : ((s2) += strlen (cs1), 1))
+#endif
+/* We intentionally do not use isdigit() for testing because this will
+   lead to problems with the wide character version.  */
+#define get_number(from, to, n) \
+  do {                                                                       \
+    int __n = n;                                                             \
+    val = 0;                                                                 \
+    while (*rp == ' ')                                                       \
+      ++rp;                                                                  \
+    if (*rp < '0' || *rp > '9')                                                      \
+      return NULL;                                                           \
+    do {                                                                     \
+      val *= 10;                                                             \
+      val += *rp++ - '0';                                                    \
+    } while (--__n > 0 && val * 10 <= to && *rp >= '0' && *rp <= '9');       \
+    if (val < from || val > to)                                                      \
+      return NULL;                                                           \
+  } while (0)
+#ifdef _NL_CURRENT
+# define get_alt_number(from, to, n) \
+  ({                                                                         \
+     __label__ do_normal;                                                    \
+                                                                             \
+     if (*decided != raw)                                                    \
+       {                                                                     \
+        val = _nl_parse_alt_digit (&rp HELPER_LOCALE_ARG);                   \
+        if (val == -1 && *decided != loc)                                    \
+          {                                                                  \
+            *decided = loc;                                                  \
+            goto do_normal;                                                  \
+          }                                                                  \
+       if (val < from || val > to)                                           \
+         return NULL;                                                        \
+       }                                                                     \
+     else                                                                    \
+       {                                                                     \
+       do_normal:                                                            \
+        get_number (from, to, n);                                            \
+       }                                                                     \
+    0;                                                                       \
+  })
+#else
+# define get_alt_number(from, to, n) \
+  /* We don't have the alternate representation.  */                         \
+  get_number(from, to, n)
+#endif
+#define recursive(new_fmt) \
+  (*(new_fmt) != '\0'                                                        \
+   && (rp = __strptime_internal (rp, (new_fmt), tm,                          \
+                                decided, era_cnt LOCALE_ARG)) != NULL)
+
+
+#ifdef _LIBC
+/* This is defined in locale/C-time.c in the GNU libc.  */
+extern const struct locale_data _nl_C_LC_TIME attribute_hidden;
+
+# define weekday_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (DAY_1)].string)
+# define ab_weekday_name \
+  (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABDAY_1)].string)
+# define month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (MON_1)].string)
+# define ab_month_name (&_nl_C_LC_TIME.values[_NL_ITEM_INDEX (ABMON_1)].string)
+# define HERE_D_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_T_FMT)].string)
+# define HERE_D_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (D_FMT)].string)
+# define HERE_AM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (AM_STR)].string)
+# define HERE_PM_STR (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (PM_STR)].string)
+# define HERE_T_FMT_AMPM \
+  (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT_AMPM)].string)
+# define HERE_T_FMT (_nl_C_LC_TIME.values[_NL_ITEM_INDEX (T_FMT)].string)
+
+# define strncasecmp(s1, s2, n) __strncasecmp (s1, s2, n)
+#else
+static char const weekday_name[][10] =
+  {
+    "Sunday", "Monday", "Tuesday", "Wednesday",
+    "Thursday", "Friday", "Saturday"
+  };
+static char const ab_weekday_name[][4] =
+  {
+    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+  };
+static char const month_name[][10] =
+  {
+    "January", "February", "March", "April", "May", "June",
+    "July", "August", "September", "October", "November", "December"
+  };
+static char const ab_month_name[][4] =
+  {
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+  };
+# define HERE_D_T_FMT "%a %b %e %H:%M:%S %Y"
+# define HERE_D_FMT "%m/%d/%y"
+# define HERE_AM_STR "AM"
+# define HERE_PM_STR "PM"
+# define HERE_T_FMT_AMPM "%I:%M:%S %p"
+# define HERE_T_FMT "%H:%M:%S"
+
+static const unsigned short int __mon_yday[2][13] =
+  {
+    /* Normal years.  */
+    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+    /* Leap years.  */
+    { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+  };
+#endif
+
+#if defined _LIBC
+/* We use this code also for the extended locale handling where the
+   function gets as an additional argument the locale which has to be
+   used.  To access the values we have to redefine the _NL_CURRENT
+   macro.  */
+# define strptime              __strptime_l
+# undef _NL_CURRENT
+# define _NL_CURRENT(category, item) \
+  (current->values[_NL_ITEM_INDEX (item)].string)
+# undef _NL_CURRENT_WORD
+# define _NL_CURRENT_WORD(category, item) \
+  (current->values[_NL_ITEM_INDEX (item)].word)
+# define LOCALE_PARAM , locale
+# define LOCALE_ARG , locale
+# define LOCALE_PARAM_PROTO , __locale_t locale
+# define LOCALE_PARAM_DECL __locale_t locale;
+# define HELPER_LOCALE_ARG , current
+# define ISSPACE(Ch) __isspace_l (Ch, locale)
+#else
+# define LOCALE_PARAM
+# define LOCALE_ARG
+# define LOCALE_PARAM_DECL
+# define LOCALE_PARAM_PROTO
+# define HELPER_LOCALE_ARG
+# define ISSPACE(Ch) isspace (Ch)
+#endif
+
+
+
+
+#ifndef __isleap
+/* Nonzero if YEAR is a leap year (every 4 years,
+   except every 100th isn't, and every 400th is).  */
+# define __isleap(year)        \
+  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+#endif
+
+/* Compute the day of the week.  */
+static void
+day_of_the_week (struct tm *tm)
+{
+  /* We know that January 1st 1970 was a Thursday (= 4).  Compute the
+     the difference between this data in the one on TM and so determine
+     the weekday.  */
+  int corr_year = 1900 + tm->tm_year - (tm->tm_mon < 2);
+  int wday = (-473
+             + (365 * (tm->tm_year - 70))
+             + (corr_year / 4)
+             - ((corr_year / 4) / 25) + ((corr_year / 4) % 25 < 0)
+             + (((corr_year / 4) / 25) / 4)
+             + __mon_yday[0][tm->tm_mon]
+             + tm->tm_mday - 1);
+  tm->tm_wday = ((wday % 7) + 7) % 7;
+}
+
+/* Compute the day of the year.  */
+static void
+day_of_the_year (struct tm *tm)
+{
+  tm->tm_yday = (__mon_yday[__isleap (1900 + tm->tm_year)][tm->tm_mon]
+                + (tm->tm_mday - 1));
+}
+
+
+#ifdef _LIBC
+char *
+internal_function
+#else
+static char *
+#endif
+__strptime_internal (rp, fmt, tm, decided, era_cnt LOCALE_PARAM)
+     const char *rp;
+     const char *fmt;
+     struct tm *tm;
+     enum ptime_locale_status *decided;
+     int era_cnt;
+     LOCALE_PARAM_DECL
+{
+#ifdef _LIBC
+  struct locale_data *const current = locale->__locales[LC_TIME];
+#endif
+
+  const char *rp_backup;
+  int cnt;
+  size_t val;
+  int have_I, is_pm;
+  int century, want_century;
+  int want_era;
+  int have_wday, want_xday;
+  int have_yday;
+  int have_mon, have_mday;
+  int have_uweek, have_wweek;
+  int week_no;
+  size_t num_eras;
+  struct era_entry *era;
+
+  have_I = is_pm = 0;
+  century = -1;
+  want_century = 0;
+  want_era = 0;
+  era = NULL;
+  week_no = 0;
+
+  have_wday = want_xday = have_yday = have_mon = have_mday = have_uweek = 0;
+  have_wweek = 0;
+
+  while (*fmt != '\0')
+    {
+      /* A white space in the format string matches 0 more or white
+        space in the input string.  */
+      if (ISSPACE (*fmt))
+       {
+         while (ISSPACE (*rp))
+           ++rp;
+         ++fmt;
+         continue;
+       }
+
+      /* Any character but `%' must be matched by the same character
+        in the iput string.  */
+      if (*fmt != '%')
+       {
+         match_char (*fmt++, *rp++);
+         continue;
+       }
+
+      ++fmt;
+#ifndef _NL_CURRENT
+      /* We need this for handling the `E' modifier.  */
+    start_over:
+#endif
+
+      /* Make back up of current processing pointer.  */
+      rp_backup = rp;
+
+      switch (*fmt++)
+       {
+       case '%':
+         /* Match the `%' character itself.  */
+         match_char ('%', *rp++);
+         break;
+       case 'a':
+       case 'A':
+         /* Match day of week.  */
+         for (cnt = 0; cnt < 7; ++cnt)
+           {
+#ifdef _NL_CURRENT
+             if (*decided !=raw)
+               {
+                 if (match_string (_NL_CURRENT (LC_TIME, DAY_1 + cnt), rp))
+                   {
+                     if (*decided == not
+                         && strcmp (_NL_CURRENT (LC_TIME, DAY_1 + cnt),
+                                    weekday_name[cnt]))
+                       *decided = loc;
+                     break;
+                   }
+                 if (match_string (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt), rp))
+                   {
+                     if (*decided == not
+                         && strcmp (_NL_CURRENT (LC_TIME, ABDAY_1 + cnt),
+                                    ab_weekday_name[cnt]))
+                       *decided = loc;
+                     break;
+                   }
+               }
+#endif
+             if (*decided != loc
+                 && (match_string (weekday_name[cnt], rp)
+                     || match_string (ab_weekday_name[cnt], rp)))
+               {
+                 *decided = raw;
+                 break;
+               }
+           }
+         if (cnt == 7)
+           /* Does not match a weekday name.  */
+           return NULL;
+         tm->tm_wday = cnt;
+         have_wday = 1;
+         break;
+       case 'b':
+       case 'B':
+       case 'h':
+         /* Match month name.  */
+         for (cnt = 0; cnt < 12; ++cnt)
+           {
+#ifdef _NL_CURRENT
+             if (*decided !=raw)
+               {
+                 if (match_string (_NL_CURRENT (LC_TIME, MON_1 + cnt), rp))
+                   {
+                     if (*decided == not
+                         && strcmp (_NL_CURRENT (LC_TIME, MON_1 + cnt),
+                                    month_name[cnt]))
+                       *decided = loc;
+                     break;
+                   }
+                 if (match_string (_NL_CURRENT (LC_TIME, ABMON_1 + cnt), rp))
+                   {
+                     if (*decided == not
+                         && strcmp (_NL_CURRENT (LC_TIME, ABMON_1 + cnt),
+                                    ab_month_name[cnt]))
+                       *decided = loc;
+                     break;
+                   }
+               }
+#endif
+             if (match_string (month_name[cnt], rp)
+                 || match_string (ab_month_name[cnt], rp))
+               {
+                 *decided = raw;
+                 break;
+               }
+           }
+         if (cnt == 12)
+           /* Does not match a month name.  */
+           return NULL;
+         tm->tm_mon = cnt;
+         want_xday = 1;
+         break;
+       case 'c':
+         /* Match locale's date and time format.  */
+#ifdef _NL_CURRENT
+         if (*decided != raw)
+           {
+             if (!recursive (_NL_CURRENT (LC_TIME, D_T_FMT)))
+               {
+                 if (*decided == loc)
+                   return NULL;
+                 else
+                   rp = rp_backup;
+               }
+             else
+               {
+                 if (*decided == not &&
+                     strcmp (_NL_CURRENT (LC_TIME, D_T_FMT), HERE_D_T_FMT))
+                   *decided = loc;
+                 want_xday = 1;
+                 break;
+               }
+             *decided = raw;
+           }
+#endif
+         if (!recursive (HERE_D_T_FMT))
+           return NULL;
+         want_xday = 1;
+         break;
+       case 'C':
+         /* Match century number.  */
+       match_century:
+         get_number (0, 99, 2);
+         century = val;
+         want_xday = 1;
+         break;
+       case 'd':
+       case 'e':
+         /* Match day of month.  */
+         get_number (1, 31, 2);
+         tm->tm_mday = val;
+         have_mday = 1;
+         want_xday = 1;
+         break;
+       case 'F':
+         if (!recursive ("%Y-%m-%d"))
+           return NULL;
+         want_xday = 1;
+         break;
+       case 'x':
+#ifdef _NL_CURRENT
+         if (*decided != raw)
+           {
+             if (!recursive (_NL_CURRENT (LC_TIME, D_FMT)))
+               {
+                 if (*decided == loc)
+                   return NULL;
+                 else
+                   rp = rp_backup;
+               }
+             else
+               {
+                 if (*decided == not
+                     && strcmp (_NL_CURRENT (LC_TIME, D_FMT), HERE_D_FMT))
+                   *decided = loc;
+                 want_xday = 1;
+                 break;
+               }
+             *decided = raw;
+           }
+#endif
+         /* Fall through.  */
+       case 'D':
+         /* Match standard day format.  */
+         if (!recursive (HERE_D_FMT))
+           return NULL;
+         want_xday = 1;
+         break;
+       case 'k':
+       case 'H':
+         /* Match hour in 24-hour clock.  */
+         get_number (0, 23, 2);
+         tm->tm_hour = val;
+         have_I = 0;
+         break;
+       case 'l':
+         /* Match hour in 12-hour clock.  GNU extension.  */
+       case 'I':
+         /* Match hour in 12-hour clock.  */
+         get_number (1, 12, 2);
+         tm->tm_hour = val % 12;
+         have_I = 1;
+         break;
+       case 'j':
+         /* Match day number of year.  */
+         get_number (1, 366, 3);
+         tm->tm_yday = val - 1;
+         have_yday = 1;
+         break;
+       case 'm':
+         /* Match number of month.  */
+         get_number (1, 12, 2);
+         tm->tm_mon = val - 1;
+         have_mon = 1;
+         want_xday = 1;
+         break;
+       case 'M':
+         /* Match minute.  */
+         get_number (0, 59, 2);
+         tm->tm_min = val;
+         break;
+       case 'n':
+       case 't':
+         /* Match any white space.  */
+         while (ISSPACE (*rp))
+           ++rp;
+         break;
+       case 'p':
+         /* Match locale's equivalent of AM/PM.  */
+#ifdef _NL_CURRENT
+         if (*decided != raw)
+           {
+             if (match_string (_NL_CURRENT (LC_TIME, AM_STR), rp))
+               {
+                 if (strcmp (_NL_CURRENT (LC_TIME, AM_STR), HERE_AM_STR))
+                   *decided = loc;
+                 break;
+               }
+             if (match_string (_NL_CURRENT (LC_TIME, PM_STR), rp))
+               {
+                 if (strcmp (_NL_CURRENT (LC_TIME, PM_STR), HERE_PM_STR))
+                   *decided = loc;
+                 is_pm = 1;
+                 break;
+               }
+             *decided = raw;
+           }
+#endif
+         if (!match_string (HERE_AM_STR, rp))
+           if (match_string (HERE_PM_STR, rp))
+             is_pm = 1;
+           else
+             return NULL;
+         break;
+       case 'r':
+#ifdef _NL_CURRENT
+         if (*decided != raw)
+           {
+             if (!recursive (_NL_CURRENT (LC_TIME, T_FMT_AMPM)))
+               {
+                 if (*decided == loc)
+                   return NULL;
+                 else
+                   rp = rp_backup;
+               }
+             else
+               {
+                 if (*decided == not &&
+                     strcmp (_NL_CURRENT (LC_TIME, T_FMT_AMPM),
+                             HERE_T_FMT_AMPM))
+                   *decided = loc;
+                 break;
+               }
+             *decided = raw;
+           }
+#endif
+         if (!recursive (HERE_T_FMT_AMPM))
+           return NULL;
+         break;
+       case 'R':
+         if (!recursive ("%H:%M"))
+           return NULL;
+         break;
+       case 's':
+         {
+           /* The number of seconds may be very high so we cannot use
+              the `get_number' macro.  Instead read the number
+              character for character and construct the result while
+              doing this.  */
+           time_t secs = 0;
+           if (*rp < '0' || *rp > '9')
+             /* We need at least one digit.  */
+             return NULL;
+
+           do
+             {
+               secs *= 10;
+               secs += *rp++ - '0';
+             }
+           while (*rp >= '0' && *rp <= '9');
+
+           if (localtime_r (&secs, tm) == NULL)
+             /* Error in function.  */
+             return NULL;
+         }
+         break;
+       case 'S':
+         get_number (0, 61, 2);
+         tm->tm_sec = val;
+         break;
+       case 'X':
+#ifdef _NL_CURRENT
+         if (*decided != raw)
+           {
+             if (!recursive (_NL_CURRENT (LC_TIME, T_FMT)))
+               {
+                 if (*decided == loc)
+                   return NULL;
+                 else
+                   rp = rp_backup;
+               }
+             else
+               {
+                 if (strcmp (_NL_CURRENT (LC_TIME, T_FMT), HERE_T_FMT))
+                   *decided = loc;
+                 break;
+               }
+             *decided = raw;
+           }
+#endif
+         /* Fall through.  */
+       case 'T':
+         if (!recursive (HERE_T_FMT))
+           return NULL;
+         break;
+       case 'u':
+         get_number (1, 7, 1);
+         tm->tm_wday = val % 7;
+         have_wday = 1;
+         break;
+       case 'g':
+         get_number (0, 99, 2);
+         /* XXX This cannot determine any field in TM.  */
+         break;
+       case 'G':
+         if (*rp < '0' || *rp > '9')
+           return NULL;
+         /* XXX Ignore the number since we would need some more
+            information to compute a real date.  */
+         do
+           ++rp;
+         while (*rp >= '0' && *rp <= '9');
+         break;
+       case 'U':
+         get_number (0, 53, 2);
+         week_no = val;
+         have_uweek = 1;
+         break;
+       case 'W':
+         get_number (0, 53, 2);
+         week_no = val;
+         have_wweek = 1;
+         break;
+       case 'V':
+         get_number (0, 53, 2);
+         /* XXX This cannot determine any field in TM without some
+            information.  */
+         break;
+       case 'w':
+         /* Match number of weekday.  */
+         get_number (0, 6, 1);
+         tm->tm_wday = val;
+         have_wday = 1;
+         break;
+       case 'y':
+       match_year_in_century:
+         /* Match year within century.  */
+         get_number (0, 99, 2);
+         /* The "Year 2000: The Millennium Rollover" paper suggests that
+            values in the range 69-99 refer to the twentieth century.  */
+         tm->tm_year = val >= 69 ? val : val + 100;
+         /* Indicate that we want to use the century, if specified.  */
+         want_century = 1;
+         want_xday = 1;
+         break;
+       case 'Y':
+         /* Match year including century number.  */
+         get_number (0, 9999, 4);
+         tm->tm_year = val - 1900;
+         want_century = 0;
+         want_xday = 1;
+         break;
+       case 'Z':
+         /* XXX How to handle this?  */
+         break;
+       case 'E':
+#ifdef _NL_CURRENT
+         switch (*fmt++)
+           {
+           case 'c':
+             /* Match locale's alternate date and time format.  */
+             if (*decided != raw)
+               {
+                 const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_T_FMT);
+
+                 if (*fmt == '\0')
+                   fmt = _NL_CURRENT (LC_TIME, D_T_FMT);
+
+                 if (!recursive (fmt))
+                   {
+                     if (*decided == loc)
+                       return NULL;
+                     else
+                       rp = rp_backup;
+                   }
+                 else
+                   {
+                     if (strcmp (fmt, HERE_D_T_FMT))
+                       *decided = loc;
+                     want_xday = 1;
+                     break;
+                   }
+                 *decided = raw;
+               }
+             /* The C locale has no era information, so use the
+                normal representation.  */
+             if (!recursive (HERE_D_T_FMT))
+               return NULL;
+             want_xday = 1;
+             break;
+           case 'C':
+             if (*decided != raw)
+               {
+                 if (era_cnt >= 0)
+                   {
+                     era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
+                     if (era != NULL && match_string (era->era_name, rp))
+                       {
+                         *decided = loc;
+                         break;
+                       }
+                     else
+                       return NULL;
+                   }
+                 else
+                   {
+                     num_eras = _NL_CURRENT_WORD (LC_TIME,
+                                                  _NL_TIME_ERA_NUM_ENTRIES);
+                     for (era_cnt = 0; era_cnt < (int) num_eras;
+                          ++era_cnt, rp = rp_backup)
+                       {
+                         era = _nl_select_era_entry (era_cnt
+                                                     HELPER_LOCALE_ARG);
+                         if (era != NULL && match_string (era->era_name, rp))
+                           {
+                             *decided = loc;
+                             break;
+                           }
+                       }
+                     if (era_cnt == (int) num_eras)
+                       {
+                         era_cnt = -1;
+                         if (*decided == loc)
+                           return NULL;
+                       }
+                     else
+                       break;
+                   }
+
+                 *decided = raw;
+               }
+             /* The C locale has no era information, so use the
+                normal representation.  */
+             goto match_century;
+           case 'y':
+             if (*decided == raw)
+               goto match_year_in_century;
+
+             get_number(0, 9999, 4);
+             tm->tm_year = val;
+             want_era = 1;
+             want_xday = 1;
+             want_century = 1;
+             break;
+           case 'Y':
+             if (*decided != raw)
+               {
+                 num_eras = _NL_CURRENT_WORD (LC_TIME,
+                                              _NL_TIME_ERA_NUM_ENTRIES);
+                 for (era_cnt = 0; era_cnt < (int) num_eras;
+                      ++era_cnt, rp = rp_backup)
+                   {
+                     era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
+                     if (era != NULL && recursive (era->era_format))
+                       break;
+                   }
+                 if (era_cnt == (int) num_eras)
+                   {
+                     era_cnt = -1;
+                     if (*decided == loc)
+                       return NULL;
+                     else
+                       rp = rp_backup;
+                   }
+                 else
+                   {
+                     *decided = loc;
+                     era_cnt = -1;
+                     break;
+                   }
+
+                 *decided = raw;
+               }
+             get_number (0, 9999, 4);
+             tm->tm_year = val - 1900;
+             want_century = 0;
+             want_xday = 1;
+             break;
+           case 'x':
+             if (*decided != raw)
+               {
+                 const char *fmt = _NL_CURRENT (LC_TIME, ERA_D_FMT);
+
+                 if (*fmt == '\0')
+                   fmt = _NL_CURRENT (LC_TIME, D_FMT);
+
+                 if (!recursive (fmt))
+                   {
+                     if (*decided == loc)
+                       return NULL;
+                     else
+                       rp = rp_backup;
+                   }
+                 else
+                   {
+                     if (strcmp (fmt, HERE_D_FMT))
+                       *decided = loc;
+                     break;
+                   }
+                 *decided = raw;
+               }
+             if (!recursive (HERE_D_FMT))
+               return NULL;
+             break;
+           case 'X':
+             if (*decided != raw)
+               {
+                 const char *fmt = _NL_CURRENT (LC_TIME, ERA_T_FMT);
+
+                 if (*fmt == '\0')
+                   fmt = _NL_CURRENT (LC_TIME, T_FMT);
+
+                 if (!recursive (fmt))
+                   {
+                     if (*decided == loc)
+                       return NULL;
+                     else
+                       rp = rp_backup;
+                   }
+                 else
+                   {
+                     if (strcmp (fmt, HERE_T_FMT))
+                       *decided = loc;
+                     break;
+                   }
+                 *decided = raw;
+               }
+             if (!recursive (HERE_T_FMT))
+               return NULL;
+             break;
+           default:
+             return NULL;
+           }
+         break;
+#else
+         /* We have no information about the era format.  Just use
+            the normal format.  */
+         if (*fmt != 'c' && *fmt != 'C' && *fmt != 'y' && *fmt != 'Y'
+             && *fmt != 'x' && *fmt != 'X')
+           /* This is an illegal format.  */
+           return NULL;
+
+         goto start_over;
+#endif
+       case 'O':
+         switch (*fmt++)
+           {
+           case 'd':
+           case 'e':
+             /* Match day of month using alternate numeric symbols.  */
+             get_alt_number (1, 31, 2);
+             tm->tm_mday = val;
+             have_mday = 1;
+             want_xday = 1;
+             break;
+           case 'H':
+             /* Match hour in 24-hour clock using alternate numeric
+                symbols.  */
+             get_alt_number (0, 23, 2);
+             tm->tm_hour = val;
+             have_I = 0;
+             break;
+           case 'I':
+             /* Match hour in 12-hour clock using alternate numeric
+                symbols.  */
+             get_alt_number (1, 12, 2);
+             tm->tm_hour = val % 12;
+             have_I = 1;
+             break;
+           case 'm':
+             /* Match month using alternate numeric symbols.  */
+             get_alt_number (1, 12, 2);
+             tm->tm_mon = val - 1;
+             have_mon = 1;
+             want_xday = 1;
+             break;
+           case 'M':
+             /* Match minutes using alternate numeric symbols.  */
+             get_alt_number (0, 59, 2);
+             tm->tm_min = val;
+             break;
+           case 'S':
+             /* Match seconds using alternate numeric symbols.  */
+             get_alt_number (0, 61, 2);
+             tm->tm_sec = val;
+             break;
+           case 'U':
+             get_alt_number (0, 53, 2);
+             week_no = val;
+             have_uweek = 1;
+             break;
+           case 'W':
+             get_alt_number (0, 53, 2);
+             week_no = val;
+             have_wweek = 1;
+             break;
+           case 'V':
+             get_alt_number (0, 53, 2);
+             /* XXX This cannot determine any field in TM without
+                further information.  */
+             break;
+           case 'w':
+             /* Match number of weekday using alternate numeric symbols.  */
+             get_alt_number (0, 6, 1);
+             tm->tm_wday = val;
+             have_wday = 1;
+             break;
+           case 'y':
+             /* Match year within century using alternate numeric symbols.  */
+             get_alt_number (0, 99, 2);
+             tm->tm_year = val >= 69 ? val : val + 100;
+             want_xday = 1;
+             break;
+           default:
+             return NULL;
+           }
+         break;
+       default:
+         return NULL;
+       }
+    }
+
+  if (have_I && is_pm)
+    tm->tm_hour += 12;
+
+  if (century != -1)
+    {
+      if (want_century)
+       tm->tm_year = tm->tm_year % 100 + (century - 19) * 100;
+      else
+       /* Only the century, but not the year.  Strange, but so be it.  */
+       tm->tm_year = (century - 19) * 100;
+    }
+
+  if (era_cnt != -1)
+    {
+      era = _nl_select_era_entry (era_cnt HELPER_LOCALE_ARG);
+      if (era == NULL)
+       return NULL;
+      if (want_era)
+       tm->tm_year = (era->start_date[0]
+                      + ((tm->tm_year - era->offset)
+                         * era->absolute_direction));
+      else
+       /* Era start year assumed.  */
+       tm->tm_year = era->start_date[0];
+    }
+  else
+    if (want_era)
+      {
+       /* No era found but we have seen an E modifier.  Rectify some
+          values.  */
+       if (want_century && century == -1 && tm->tm_year < 69)
+         tm->tm_year += 100;
+      }
+
+  if (want_xday && !have_wday)
+    {
+      if ( !(have_mon && have_mday) && have_yday)
+       {
+         /* We don't have tm_mon and/or tm_mday, compute them.  */
+         int t_mon = 0;
+         while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon] <= tm->tm_yday)
+             t_mon++;
+         if (!have_mon)
+             tm->tm_mon = t_mon - 1;
+         if (!have_mday)
+             tm->tm_mday =
+               (tm->tm_yday
+                - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
+       }
+      day_of_the_week (tm);
+    }
+
+  if (want_xday && !have_yday)
+    day_of_the_year (tm);
+
+  if ((have_uweek || have_wweek) && have_wday)
+    {
+      int save_wday = tm->tm_wday;
+      int save_mday = tm->tm_mday;
+      int save_mon = tm->tm_mon;
+      int w_offset = have_uweek ? 0 : 1;
+
+      tm->tm_mday = 1;
+      tm->tm_mon = 0;
+      day_of_the_week (tm);
+      if (have_mday)
+       tm->tm_mday = save_mday;
+      if (have_mon)
+       tm->tm_mon = save_mon;
+
+      if (!have_yday)
+       tm->tm_yday = ((7 - (tm->tm_wday - w_offset)) % 7
+                      + (week_no - 1) *7
+                      + save_wday - w_offset);
+
+      if (!have_mday || !have_mon)
+       {
+         int t_mon = 0;
+         while (__mon_yday[__isleap(1900 + tm->tm_year)][t_mon]
+                <= tm->tm_yday)
+           t_mon++;
+         if (!have_mon)
+           tm->tm_mon = t_mon - 1;
+         if (!have_mday)
+             tm->tm_mday =
+               (tm->tm_yday
+                - __mon_yday[__isleap(1900 + tm->tm_year)][t_mon - 1] + 1);
+       }
+
+      tm->tm_wday = save_wday;
+    }
+
+  return (char *) rp;
+}
+
+
+char *
+strptime (buf, format, tm LOCALE_PARAM)
+     const char *buf;
+     const char *format;
+     struct tm *tm;
+     LOCALE_PARAM_DECL
+{
+  enum ptime_locale_status decided;
+
+#ifdef _NL_CURRENT
+  decided = not;
+#else
+  decided = raw;
+#endif
+  return __strptime_internal (buf, format, tm, &decided, -1 LOCALE_ARG);
+}
+
+#ifdef _LIBC
 weak_alias (__strptime_l, strptime_l)
+#endif