Add strptime, and commonize some locale strings

 -Erik

1 files changed, 977 insertions, 0 deletions

diff --git a/libc/misc/time/strptime.c b/libc/misc/time/strptime.c
new file mode 100644
index 000000000..d8afa281f
--- /dev/null
+++ b/libc/misc/time/strptime.c
@@ -0,0 +1,977 @@
+/* Convert a string representation of time to a time value.
+   Copyright (C) 1996-2000, 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* XXX This version of the implementation is not really complete.
+   Some of the fields cannot add information alone.  But if seeing
+   some of them in the same format (such as year, week and weekday)
+   this is enough information for determining the date.  */
+
+#include <ctype.h>
+#include <langinfo.h>
+#include <limits.h>
+#include <string.h>
+#include <time.h>
+
+#undef _NL_CURRENT
+#undef ENABLE_ERA_JUNK
+
+
+#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 ((cs1), (s2), len) == 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);				      \
+	 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)) != NULL)
+
+
+#ifdef _NL_CURRENT
+/* This is defined in locale/C-time.c in the GNU libc.  */
+extern const struct locale_data _nl_C_LC_TIME;
+extern const unsigned short int __mon_yday[2][13];
+
+# 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
+extern char const __weekday_name[][10];
+extern char const __ab_weekday_name[][4];
+extern char const __month_name[][10];
+extern char const __ab_month_name[][4];
+extern const unsigned short int __mon_yday[2][13];
+# 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"
+#endif
+
+/* Status of lookup: do we use the locale data or the raw data?  */
+enum locale_status { not, loc, raw };
+
+
+#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));
+}
+
+
+static char * __strptime_internal (rp, fmt, tm, decided, era_cnt)
+     const char *rp;
+     const char *fmt;
+     struct tm *tm;
+     enum locale_status *decided;
+     int era_cnt;
+{
+    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':
+#ifdef ENABLE_ERA_JUNK
+			if (*decided != raw)
+			{
+			    if (era_cnt >= 0)
+			    {
+				era = _nl_select_era_entry (era_cnt);
+				if (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);
+				    if (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;
+			}
+#endif
+			/* 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':
+#ifdef ENABLE_ERA_JUNK
+			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);
+				if (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;
+			}
+#endif
+			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;
+    }
+
+#ifdef ENABLE_ERA_JUNK
+    if (era_cnt != -1)
+    {
+	era = _nl_select_era_entry (era_cnt);
+	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
+#endif
+	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)
+     const char *buf;
+     const char *format;
+     struct tm *tm;
+{
+    enum locale_status decided;
+
+#ifdef _NL_CURRENT
+    decided = not;
+#else
+    decided = raw;
+#endif
+    return __strptime_internal (buf, format, tm, &decided, -1);
+}