diff mbox series

[v5] Fix strptime era handling, add more strftime tests [BZ #24394]

Message ID xnzhpdo7cd.fsf@greed.delorie.com
State New
Headers show
Series [v5] Fix strptime era handling, add more strftime tests [BZ #24394] | expand

Commit Message

DJ Delorie March 29, 2019, 6:37 p.m. UTC 
Tweaked the first line to be more accurate (purpose of the test).

Print mistmatched weekdays as strings if they're valid.

Fold long test name lines if needed.

I renamed the buffers used to compare times so that the diagnostics are
more useful.

Spaces instead of dashes in time strings.

----

Test the transition points between all the currently listed Japanese
era name changes. This includes testing the transition between the
first year date and the second year date. This test will help test
the upcoming Japanese era name change.

Also fixes a fencepost error where the era name isn't properly parsed
by strptime in the last (partial) year of the era.

Example: if an era change happens in Feb 1990, and again in Aug 1995,
that's 5.5 years long, but the 0.5 year wasn't accounted for.

2019-03-29  DJ Delorie  <dj@redhat.com>

	[BZ #24394]
	* time/strptime_l.c (%Ey): Fix fencepost error.
	* time/tst-strftime3.c: New.
	* time/Makefile (tests): Add tst-strftime3.

Comments

Florian Weimer March 29, 2019, 6:43 p.m. UTC | #1 
* DJ Delorie:

> +  snprintf (buffer, TMBUFLEN, "%04d/%02d/%02d %02d:%02d:%02d %s",
> +	    tm->tm_year,
> +	    tm->tm_mon,
> +	    tm->tm_mday,
> +	    tm->tm_hour,
> +	    tm->tm_min,
> +	    tm->tm_sec,
> +	    wn);

What's the reason to use this non-standard date format?  Why not ISO
8601 with 0-based years and 1-based months?
Rafal Luzynski March 29, 2019, 10:58 p.m. UTC | #2 
29.03.2019 19:37 DJ Delorie <dj@redhat.com> wrote:
> 
> Tweaked the first line to be more accurate (purpose of the test).
> 
> Print mistmatched weekdays as strings if they're valid.
> 
> Fold long test name lines if needed.
> 
> I renamed the buffers used to compare times so that the diagnostics are
> more useful.
> 
> Spaces instead of dashes in time strings.

Thank you for these changes.  Please see my comments below:

> [...]
> diff --git a/time/strptime_l.c b/time/strptime_l.c
> index e19b9a15dd..7436a168b7 100644
> --- a/time/strptime_l.c
> +++ b/time/strptime_l.c

I skip the review of changes in this file because I am unable
to analyze it thoroughly enough.  It looks good at first sight
though and I believe that the test confirms that these changes
are correct.

> diff --git a/time/tst-strftime3.c b/time/tst-strftime3.c
> new file mode 100644
> index 0000000000..274b9c3a65
> --- /dev/null
> +++ b/time/tst-strftime3.c
> @@ -0,0 +1,451 @@
> +/* Data-driven tests for strftime/strptime.

Thank you for this clarification.

> [...]
> +typedef struct Data {
> +  /* A descriptive name of the test. */

Please use two spaces before the closing "*/" consequently.

> [...]
> +   For convenience, mis-matched strings are printed in
> +   paste-compatible format, raw text format, and unicode format.  Use

/s/unicode/Unicode

> +   "" between a hex escape sequence (like \xe8) and a following hex
> +   digit which should be considered as a printable character.
> +
> +   To verify text, save the correct text in a file, and use "od -tx1
> +   -tc file" to see the raw hex values.  */
> +
> +const Data data[] = {
> +
> +  { "Baseline test",
> +    2019, Mar, 27, Wed, 14,  3, 22, "en_US.ISO-8859-1", "%Y-%m-%d %T",
> +    "2019-03-27 14:03:22" },
> +
> +
> +  { "Japanese era change, BCE/CE, before transition",
> +    0, Dec, 31, Sun, 12, 00, 00, "ja_JP.UTF-8", "%EY",
> +    /* <U7D00><U5143><U524D>01<U5E74> 紀元前01年 */
> +    "\xe7\xb4\x80\xe5\x85\x83\xe5\x89\x8d""01\xe5\xb9\xb4" },
> +  { "Japanese era change, BCE/CE, after transition",
> +    1, Jan,  1, Mon, 12, 00, 00, "ja_JP.UTF-8", "%EY",
> +    /* <U897F><U66A6>01<U5E74> 西暦01年 */
> +    "\xe8\xa5\xbf\xe6\x9a\xa6""01\xe5\xb9\xb4" },
> +
> [...]

I don't understand the rule when you decide to use one empty line
and when two empty lines between the elements of the array.  Just
please make sure you use it consequently and deliberately.

> [...]
> +static void
> +print_string_hex (const char *header, const char *str)
> +{
> +  int tictoc = 0;
> +  const char *s = str;
> +  wchar_t w[STRBUFLEN];
> +  size_t i, wlen;
> +
> +  printf("%s : ", header);

Please use a space after "printf".

> +
> +  while (s && *s)
> +    {
> +      /* isgraph() equivalent, but independent of current locale.  */

Same here after "isgraph" although I think I read recently there should
be no "()" after a function name in the documentation.

> +      if (' ' <= *s && *s <= '~')
> +	putchar(*s);
> +      else
> +	{
> +	  if (tictoc)
> +	    printf("\033[36m");
> +	  else
> +	    printf("\033[31m");
> +	  tictoc = ! tictoc;

Same here after "putchar" and "printf".

> +	  printf("\\x%02x\033[0m", (unsigned char)*s);

Same here, additionally please use a space after the type cast
operator "(unsigned char)"

> +	}
> +
> +      ++ s;
> +    }
> +  printf(" - %s\n", str);

Same here.

> +  s = str;
> +  wlen = mbsrtowcs (w, &s, strlen (s), NULL);
> +  printf("%*s", (int)strlen(header) + 3, " ");

Same here:

  printf ("%*s", (int) strlen (header) + 3, " ");

> +  for (i = 0; i < wlen && i < strlen (str); i ++)

OK.

> +    {
> +      if (' ' <= w[i] && w[i] <= '~')
> +	putchar(w[i]);
> +      else
> +	printf("<U%04X>", w[i]);
> +    }
> +  printf("\n");
> +}

Same here - "putchar", "printf".

I hope my suggestions are correct, also I (almost) don't find this
problem in other places in this file.

> [...]
> +const char *weekday_name[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri",
> +			       "Sat" };
> +
> +/* Helper function to create a printable version of struct tm.  */
> +static void
> +tm_to_printed (struct tm *tm, char *buffer)
> +{
> +  const char *wn;
> +  char temp[50];
> +
> +  if (0 <= tm->tm_wday && tm->tm_wday <= 6)
> +    wn = weekday_name[tm->tm_wday];
> +  else
> +    {
> +      wn = temp;
> +      sprintf (temp, "%d", tm->tm_wday);
> +    }

Thank you for this change.  I thought that illegal tm_wday value is
unlikely and if happens it is correct to crash/corrupt/etc.  But
your approach to handle possible illegal value is correct and not
harmful.

> +
> +  snprintf (buffer, TMBUFLEN, "%04d/%02d/%02d %02d:%02d:%02d %s",
> +	    tm->tm_year,
> +	    tm->tm_mon,

Since tm_mon is zero based, I think it should be:

	    tm->tm_mon + 1,

I am sorry for noticing this late.

> [...]
> +      /* Print this just to help debug failures.  */
> +      if (strlen (d->name) + strlen (d->locale) + strlen (d->format)
> +	  + strlen (d->printed) + 4 >= 79)
> +	printf("%s:\n\t%s %s %s\n", d->name, d->locale, d->format, d->printed);
> +      else
> +	printf("%s: %s %s %s\n", d->name, d->locale, d->format, d->printed);

I'm afraid this will not work as expected for two reasons:

* strlen counts bytes rather than characters which is wrong for UTF-8,
* double width characters (quite common in CJK languages) occupy two
  columns on the terminal.

Also, I think we can break the line always, unconditionally, so I suggest
you to break it unconditionally.  Alternatively, feel free not to break
it ever and restore the previous patch.

Also, please use a space after "printf".

> +
> +      tm.tm_year = d->y - 1900;
> +      tm.tm_mon = d->m;
> +      tm.tm_mday = d->d;
> +      tm.tm_wday = d->w;
> +      tm.tm_hour = d->hh;
> +      tm.tm_min = d->mm;
> +      tm.tm_sec = d->ss;
> +      tm.tm_isdst = -1;
> +
> +      /* LC_ALL may interfere with the snprintf in tm_to_printed.  */
> +      if (setlocale (LC_TIME, d->locale) == NULL)
> +	{
> +	  /* See the LOCALES list in the Makefile.  */
> +	  printf ("locale %s does not exist!\n", d->locale);
> +	  exit (EXIT_FAILURE);
> +	}
> +      /* This is just for printing wide characters if there's an error.
>  */
> +      setlocale (LC_CTYPE, d->locale);
> +

OK

> +      rv = strftime (buffer, sizeof(buffer), d->format, &tm);

Please use a space after "sizeof".

> +
> +      TEST_COMPARE (rv, strlen (d->printed));
> +      COMPARE_STRINGS (buffer, d->printed);
> +
> +      /* Copy the original time, so that any fields not affected by
> +	 the call to strptime() will match.  */

See my feedback above about the mention of "isgraph" in the comment.

> +      tm2 = tm;
> +
> +      rvp = strptime (d->printed, d->format, &tm2);
> +
> +      TEST_COMPARE_STRING (rvp, "");
> +
> +      tm_to_printed (&tm, expected_time);
> +      tm_to_printed (&tm2, got_time);
> +      TEST_COMPARE_STRING (got_time, expected_time);
> +    }
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>

OK.

Best regards,

Rafal
diff mbox series

Patch

diff --git a/time/Makefile b/time/Makefile
index 5c6304ece1..2ca206309d 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -43,7 +43,7 @@  tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
 	   tst-getdate tst-mktime tst-mktime2 tst-ftime_l tst-strftime \
 	   tst-mktime3 tst-strptime2 bug-asctime bug-asctime_r bug-mktime1 \
 	   tst-strptime3 bug-getdate1 tst-strptime-whitespace tst-ftime \
-	   tst-tzname tst-y2039 bug-mktime4 tst-strftime2
+	   tst-tzname tst-y2039 bug-mktime4 tst-strftime2 tst-strftime3
 
 include ../Rules
 
diff --git a/time/strptime_l.c b/time/strptime_l.c
index e19b9a15dd..7436a168b7 100644
--- a/time/strptime_l.c
+++ b/time/strptime_l.c
@@ -907,10 +907,15 @@  __strptime_internal (const char *rp, const char *fmt, struct tm *tmp,
 			{
 			  int delta = ((tm->tm_year - era->offset)
 				       * era->absolute_direction);
+			  /* The difference between two sets of years
+			     does not include the final year itself,
+			     therefore add 1 to the difference to
+			     account for that final year.  */
 			  match = (delta >= 0
 				   && delta < (((int64_t) era->stop_date[0]
 						- (int64_t) era->start_date[0])
-					       * era->absolute_direction));
+					       * era->absolute_direction
+					       + 1));
 			}
 		      if (! match)
 			return NULL;
@@ -928,10 +933,12 @@  __strptime_internal (const char *rp, const char *fmt, struct tm *tmp,
 			{
 			  int delta = ((tm->tm_year - era->offset)
 				       * era->absolute_direction);
+			  /* See comment above about year difference + 1.  */
 			  if (delta >= 0
 			      && delta < (((int64_t) era->stop_date[0]
 					   - (int64_t) era->start_date[0])
-					  * era->absolute_direction))
+					  * era->absolute_direction
+					  + 1))
 			    {
 			      s.decided = loc;
 			      break;
diff --git a/time/tst-strftime3.c b/time/tst-strftime3.c
new file mode 100644
index 0000000000..274b9c3a65
--- /dev/null
+++ b/time/tst-strftime3.c
@@ -0,0 +1,451 @@ 
+/* Data-driven tests for strftime/strptime.
+   Copyright (C) 2019 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
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <locale.h>
+#include <wchar.h>
+
+#include <support/check.h>
+#include <array_length.h>
+
+/* These exist for the convenience of writing the test data, because
+   zero-based vs one-based.  */
+typedef enum {
+  Sun, Mon, Tue, Wed, Thu, Fri, Sat
+} WeekDay;
+
+typedef enum {
+  Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
+} Month;
+
+typedef struct Data {
+  /* A descriptive name of the test. */
+  const char *name;
+
+  /* The specific date and time to be tested.  */
+  int y, m, d;
+  WeekDay w;
+  int hh, mm, ss;
+
+  /* The locale under which the conversion is done.  */
+  const char *locale;
+
+  /* Format passed to strftime.  */
+  const char *format;
+
+  /* Expected data, NUL terminated.  */
+  const char *printed;
+
+} Data;
+
+/* Notes:
+
+   Years are full 4-digit years, the code compensates.  Likewise,
+   use month and weekday enums (above) which are zero-based.
+
+   The encoded strings are multibyte strings in the C locale which
+   reflect the same binary data as the expected strings.  When you run
+   the test, the strings are printed as-is to stdout, so if your
+   terminal is set for the correct encoding, they'll be printed
+   "correctly".  Put the Unicode codes and UTF-8 samples in the
+   comments.
+
+   For convenience, mis-matched strings are printed in
+   paste-compatible format, raw text format, and unicode format.  Use
+   "" between a hex escape sequence (like \xe8) and a following hex
+   digit which should be considered as a printable character.
+
+   To verify text, save the correct text in a file, and use "od -tx1
+   -tc file" to see the raw hex values.  */
+
+const Data data[] = {
+
+  { "Baseline test",
+    2019, Mar, 27, Wed, 14,  3, 22, "en_US.ISO-8859-1", "%Y-%m-%d %T",
+    "2019-03-27 14:03:22" },
+
+
+  { "Japanese era change, BCE/CE, before transition",
+    0, Dec, 31, Sun, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U7D00><U5143><U524D>01<U5E74> 紀元前01年 */
+    "\xe7\xb4\x80\xe5\x85\x83\xe5\x89\x8d""01\xe5\xb9\xb4" },
+  { "Japanese era change, BCE/CE, after transition",
+    1, Jan,  1, Mon, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U897F><U66A6>01<U5E74> 西暦01年 */
+    "\xe8\xa5\xbf\xe6\x9a\xa6""01\xe5\xb9\xb4" },
+
+  { "Japanese era change, BCE/CE, before transition",
+    0, Dec, 31, Sun, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U7D00><U5143><U524D>01<U5E74> 紀元前01年 */
+    "\xb5\xaa\xb8\xb5\xc1\xb0""01\xc7\xaf" },
+  { "Japanese era change, BCE/CE, after transition",
+    1, Jan,  1, Mon, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U897F><U66A6>01<U5E74> 西暦01年 */
+    "\xc0\xbe\xce\xf1""01\xc7\xaf" },
+
+
+  { "Japanese era change, 1873, before transition",
+    1872, Dec, 31, Tue, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U897F><U66A6>1872<U5E74> 西暦1872年 */
+    "\xe8\xa5\xbf\xe6\x9a\xa6""1872\xe5\xb9\xb4" },
+  { "Japanese era change, 1873, after transition",
+    1873, Jan,  1, Wed, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U660E><U6CBB>06<U5E74> 明治06年 */
+    "\xe6\x98\x8e\xe6\xb2\xbb""06\xe5\xb9\xb4" },
+
+
+  { "Japanese era change, 1873, before transition",
+    1872, Dec, 31, Tue, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U897F><U66A6>1872<U5E74> 西暦1872年 */
+    "\xc0\xbe\xce\xf1""1872\xc7\xaf" },
+  { "Japanese era change, 1873, after transition",
+    1873, Jan,  1, Wed, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U660E><U6CBB>06<U5E74> 明治06年 */
+    "\xcc\xc0\xbc\xa3""06\xc7\xaf" },
+
+
+  { "Japanese era change, 1912, before transition year",
+    1911, Dec, 31, Sun, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U660E><U6CBB>44<U5E74> 明治44年 */
+    "\xe6\x98\x8e\xe6\xb2\xbb""44\xe5\xb9\xb4" },
+  { "Japanese era change, 1912, start of transition year",
+    1912, Jan,  1, Mon, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U660E><U6CBB>45<U5E74> 明治45年 */
+    "\xe6\x98\x8e\xe6\xb2\xbb""45\xe5\xb9\xb4" },
+
+  { "Japanese era change, 1912, before transition",
+    1912, Jul, 29, Mon, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U660E><U6CBB>45<U5E74> 明治45年 */
+    "\xe6\x98\x8e\xe6\xb2\xbb""45\xe5\xb9\xb4" },
+  { "Japanese era change, 1912, after transition",
+    1912, Jul, 30, Tue, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5927><U6B63><U5143><U5E74> 大正元年 */
+    "\xe5\xa4\xa7\xe6\xad\xa3\xe5\x85\x83\xe5\xb9\xb4" },
+
+  { "Japanese era change, 1912, before end of transition year",
+    1912, Dec, 31, Tue, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5927><U6B63><U5143><U5E74> 大正元年 */
+    "\xe5\xa4\xa7\xe6\xad\xa3\xe5\x85\x83\xe5\xb9\xb4" },
+  { "Japanese era change, 1912, after transition year",
+    1913, Jan,  1, Wed, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5927><U6B63>02<U5E74> 大正02年 */
+    "\xe5\xa4\xa7\xe6\xad\xa3""02\xe5\xb9\xb4" },
+
+
+  { "Japanese era change, 1912, before transition year",
+    1911, Dec, 31, Sun, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U660E><U6CBB>44<U5E74> 明治44年 */
+    "\xcc\xc0\xbc\xa3""44\xc7\xaf" },
+  { "Japanese era change, 1912, start of transition year",
+    1912, Jan,  1, Mon, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U660E><U6CBB>45<U5E74> 明治45年 */
+    "\xcc\xc0\xbc\xa3""45\xc7\xaf" },
+
+  { "Japanese era change, 1912, before transition",
+    1912, Jul, 29, Mon, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U660E><U6CBB>45<U5E74> 明治45年 */
+    "\xcc\xc0\xbc\xa3""45\xc7\xaf" },
+  { "Japanese era change, 1912, after transition",
+    1912, Jul, 30, Tue, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5927><U6B63><U5143><U5E74> 大正元年 */
+    "\xc2\xe7\xc0\xb5\xb8\xb5\xc7\xaf" },
+
+  { "Japanese era change, 1912, before end of transition year",
+    1912, Dec, 31, Tue, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5927><U6B63><U5143><U5E74> 大正元年 */
+    "\xc2\xe7\xc0\xb5\xb8\xb5\xc7\xaf" },
+  { "Japanese era change, 1912, after transition year",
+    1913, Jan,  1, Wed, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5927><U6B63>02<U5E74> 大正02年 */
+    "\xc2\xe7\xc0\xb5""02\xc7\xaf" },
+
+
+  { "Japanese era change, 1926, before transition year",
+    1925, Dec, 31, Thu, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5927><U6B63>14<U5E74> 大正14年 */
+    "\xe5\xa4\xa7\xe6\xad\xa3""14\xe5\xb9\xb4" },
+  { "Japanese era change, 1926, start of transition year",
+    1926, Jan,  1, Fri, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5927><U6B63>15<U5E74> 大正15年 */
+    "\xe5\xa4\xa7\xe6\xad\xa3""15\xe5\xb9\xb4" },
+
+  { "Japanese era change, 1926, before transition",
+    1926, Dec, 24, Fri, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5927><U6B63>15<U5E74> 大正15年 */
+    "\xe5\xa4\xa7\xe6\xad\xa3""15\xe5\xb9\xb4" },
+  { "Japanese era change, 1926, after transition",
+    1926, Dec, 25, Sat, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U662D><U548C><U5143><U5E74> 昭和元年 */
+    "\xe6\x98\xad\xe5\x92\x8c\xe5\x85\x83\xe5\xb9\xb4" },
+
+  { "Japanese era change, 1926, before end of transition year",
+    1926, Dec, 31, Fri, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U662D><U548C><U5143><U5E74> 昭和元年 */
+    "\xe6\x98\xad\xe5\x92\x8c\xe5\x85\x83\xe5\xb9\xb4" },
+  { "Japanese era change, 1926, after transition year",
+    1927, Jan,  1, Sat, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /*  <U662D><U548C>02<U5E74> 昭和02年 */
+    "\xe6\x98\xad\xe5\x92\x8c""02\xe5\xb9\xb4" },
+
+
+  { "Japanese era change, 1926, before transition year",
+    1925, Dec, 31, Thu, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5927><U6B63>14<U5E74> 大正14年 */
+    "\xc2\xe7\xc0\xb5""14\xc7\xaf" },
+  { "Japanese era change, 1926, start of transition year",
+    1926, Jan,  1, Fri, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5927><U6B63>15<U5E74> 大正15年 */
+    "\xc2\xe7\xc0\xb5""15\xc7\xaf" },
+
+  { "Japanese era change, 1926, before transition",
+    1926, Dec, 24, Fri, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5927><U6B63>15<U5E74> 大正15年 */
+    "\xc2\xe7\xc0\xb5""15\xc7\xaf" },
+  { "Japanese era change, 1926, after transition",
+    1926, Dec, 25, Sat, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U662D><U548C><U5143><U5E74> 昭和元年 */
+    "\xbe\xbc\xcf\xc2\xb8\xb5\xc7\xaf" },
+
+  { "Japanese era change, 1926, before end of transition year",
+    1926, Dec, 31, Fri, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U662D><U548C><U5143><U5E74> 昭和元年 */
+    "\xbe\xbc\xcf\xc2\xb8\xb5\xc7\xaf" },
+  { "Japanese era change, 1926, after transition year",
+    1927, Jan,  1, Sat, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /*  <U662D><U548C>02<U5E74> 昭和02年 */
+    "\xbe\xbc\xcf\xc2""02\xc7\xaf" },
+
+
+  { "Japanese era change, 1989, before transition year",
+    1988, Dec, 31, Sat, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U662D><U548C>63<U5E74> 昭和63年 */
+    "\xe6\x98\xad\xe5\x92\x8c""63\xe5\xb9\xb4" },
+  { "Japanese era change, 1989, start of transition year",
+    1989, Jan,  1, Sun, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U662D><U548C>64<U5E74> 昭和64年 */
+    "\xe6\x98\xad\xe5\x92\x8c""64\xe5\xb9\xb4" },
+
+  { "Japanese era change, 1989, before transition",
+    1989, Jan,  7, Sat, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U662D><U548C>64<U5E74> 昭和64年 */
+    "\xe6\x98\xad\xe5\x92\x8c""64\xe5\xb9\xb4" },
+  { "Japanese era change, 1989, after transition",
+    1989, Jan,  8, Sun, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5E73><U6210><U5143><U5E74> 平成元年 */
+    "\xe5\xb9\xb3\xe6\x88\x90\xe5\x85\x83\xe5\xb9\xb4" },
+
+  { "Japanese era change, 1989, end of transition year",
+    1989, Dec, 31, Sun, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5E73><U6210><U5143><U5E74> 平成元年 */
+    "\xe5\xb9\xb3\xe6\x88\x90\xe5\x85\x83\xe5\xb9\xb4" },
+  { "Japanese era change, 1989, after transition year",
+    1990, Jan,  1, Mon, 12, 00, 00, "ja_JP.UTF-8", "%EY",
+    /* <U5E73><U6210>02<U5E74> 平成02年 */
+    "\xe5\xb9\xb3\xe6\x88\x90""02\xe5\xb9\xb4" },
+
+
+  { "Japanese era change, 1989, before transition year",
+    1988, Dec, 31, Sat, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U662D><U548C>63<U5E74> 昭和63年 */
+    "\xbe\xbc\xcf\xc2""63\xc7\xaf" },
+  { "Japanese era change, 1989, start of transition year",
+    1989, Jan,  1, Sun, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U662D><U548C>64<U5E74> 昭和64年 */
+    "\xbe\xbc\xcf\xc2""64\xc7\xaf" },
+
+  { "Japanese era change, 1989, before transition",
+    1989, Jan,  7, Sat, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U662D><U548C>64<U5E74> 昭和64年 */
+    "\xbe\xbc\xcf\xc2""64\xc7\xaf" },
+  { "Japanese era change, 1989, after transition",
+    1989, Jan,  8, Sun, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5E73><U6210><U5143><U5E74> 平成元年 */
+    "\xca\xbf\xc0\xae\xb8\xb5\xc7\xaf" },
+
+  { "Japanese era change, 1989, end of transition year",
+    1989, Dec, 31, Sun, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5E73><U6210><U5143><U5E74> 平成元年 */
+    "\xca\xbf\xc0\xae\xb8\xb5\xc7\xaf" },
+  { "Japanese era change, 1989, after transition year",
+    1990, Jan,  1, Mon, 12, 00, 00, "ja_JP.EUC-JP", "%EY",
+    /* <U5E73><U6210>02<U5E74> 平成02年 */
+    "\xca\xbf\xc0\xae""02\xc7\xaf" },
+};
+
+#define NDATA array_length(data)
+
+/* Size of buffer passed to strftime.  */
+#define STRBUFLEN 1000
+/* Size of buffer passed to tm_to_printed.  */
+#define TMBUFLEN 50
+
+/* Helper function to compare strings and print out mismatches in a
+   format suitable for maintaining this test.  TEST_COMPARE_STRINGS
+   prints out a less suitable format.  */
+
+static void
+print_string_hex (const char *header, const char *str)
+{
+  int tictoc = 0;
+  const char *s = str;
+  wchar_t w[STRBUFLEN];
+  size_t i, wlen;
+
+  printf("%s : ", header);
+
+  while (s && *s)
+    {
+      /* isgraph() equivalent, but independent of current locale.  */
+      if (' ' <= *s && *s <= '~')
+	putchar(*s);
+      else
+	{
+	  if (tictoc)
+	    printf("\033[36m");
+	  else
+	    printf("\033[31m");
+	  tictoc = ! tictoc;
+
+	  printf("\\x%02x\033[0m", (unsigned char)*s);
+	}
+
+      ++ s;
+    }
+  printf(" - %s\n", str);
+
+  s = str;
+  wlen = mbsrtowcs (w, &s, strlen (s), NULL);
+  printf("%*s", (int)strlen(header) + 3, " ");
+  for (i = 0; i < wlen && i < strlen (str); i ++)
+    {
+      if (' ' <= w[i] && w[i] <= '~')
+	putchar(w[i]);
+      else
+	printf("<U%04X>", w[i]);
+    }
+  printf("\n");
+}
+
+static void
+compare_strings (const char *got, const char *expected,
+		 const char *filename, int lineno)
+{
+  if (got && expected && strcmp (got, expected) == 0)
+    return;
+  support_record_failure ();
+  printf ("%s:%d: error: strftime output incorrect\n", filename, lineno);
+  print_string_hex ("Got", got);
+  print_string_hex ("Exp", expected);
+}
+#define COMPARE_STRINGS(g,e) compare_strings (g, e, __FILE__, __LINE__)
+
+const char *weekday_name[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri",
+			       "Sat" };
+
+/* Helper function to create a printable version of struct tm.  */
+static void
+tm_to_printed (struct tm *tm, char *buffer)
+{
+  const char *wn;
+  char temp[50];
+
+  if (0 <= tm->tm_wday && tm->tm_wday <= 6)
+    wn = weekday_name[tm->tm_wday];
+  else
+    {
+      wn = temp;
+      sprintf (temp, "%d", tm->tm_wday);
+    }
+
+  snprintf (buffer, TMBUFLEN, "%04d/%02d/%02d %02d:%02d:%02d %s",
+	    tm->tm_year,
+	    tm->tm_mon,
+	    tm->tm_mday,
+	    tm->tm_hour,
+	    tm->tm_min,
+	    tm->tm_sec,
+	    wn);
+}
+
+static int
+do_test (void)
+{
+  int i;
+  char buffer[STRBUFLEN];
+  char expected_time[TMBUFLEN];
+  char got_time[TMBUFLEN];
+
+  for (i = 0; i < NDATA; i ++)
+    {
+      const Data *d = &(data[i]);
+      struct tm tm;
+      struct tm tm2;
+      size_t rv;
+      char *rvp;
+
+      /* Print this just to help debug failures.  */
+      if (strlen (d->name) + strlen (d->locale) + strlen (d->format)
+	  + strlen (d->printed) + 4 >= 79)
+	printf("%s:\n\t%s %s %s\n", d->name, d->locale, d->format, d->printed);
+      else
+	printf("%s: %s %s %s\n", d->name, d->locale, d->format, d->printed);
+
+      tm.tm_year = d->y - 1900;
+      tm.tm_mon = d->m;
+      tm.tm_mday = d->d;
+      tm.tm_wday = d->w;
+      tm.tm_hour = d->hh;
+      tm.tm_min = d->mm;
+      tm.tm_sec = d->ss;
+      tm.tm_isdst = -1;
+
+      /* LC_ALL may interfere with the snprintf in tm_to_printed.  */
+      if (setlocale (LC_TIME, d->locale) == NULL)
+	{
+	  /* See the LOCALES list in the Makefile.  */
+	  printf ("locale %s does not exist!\n", d->locale);
+	  exit (EXIT_FAILURE);
+	}
+      /* This is just for printing wide characters if there's an error.  */
+      setlocale (LC_CTYPE, d->locale);
+
+      rv = strftime (buffer, sizeof(buffer), d->format, &tm);
+
+      TEST_COMPARE (rv, strlen (d->printed));
+      COMPARE_STRINGS (buffer, d->printed);
+
+      /* Copy the original time, so that any fields not affected by
+	 the call to strptime() will match.  */
+      tm2 = tm;
+
+      rvp = strptime (d->printed, d->format, &tm2);
+
+      TEST_COMPARE_STRING (rvp, "");
+
+      tm_to_printed (&tm, expected_time);
+      tm_to_printed (&tm2, got_time);
+      TEST_COMPARE_STRING (got_time, expected_time);
+    }
+
+  return 0;
+}
+
+#include <support/test-driver.c>