[Bug libstdc++/18678] New: std::time_put<wchar_t> is broken with UTF-8 locales

["gcc-bugzilla at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Using the example code below, this is the output for an en_GB
UTF-8 locale:

$ ./date3
asctime:                Thu Nov 25 17:39:15 2004
strftime:               Thu 25 Nov 2004 17:39:15 GMT
std::time_put<char>:    Thu 25 Nov 2004 17:39:15 GMT
std::time_put<wchar_t>: Thu 25 Nov 2004 17:39:15 GMT

Some examples of running in an alternate locale are shown below.
Please note: these locales have all been generated to use UTF-8
as their codeset.

$ LANG=fr_FR LC_ALL=fr_FR ./date3
asctime:                Thu Nov 25 17:40:05 2004
strftime:               jeu 25 nov 2004 17:40:05 GMT
std::time_put<char>:    jeu 25 nov 2004 17:40:05 GMT
std::time_put<wchar_t>: jeu 25 nov 2004 17:40:05 GMT

$ LANG=de_DE LC_ALL=de_DE ./date3
asctime:                Thu Nov 25 17:40:29 2004
strftime:               Do 25 Nov 2004 17:40:29 GMT
std::time_put<char>:    Do 25 Nov 2004 17:40:29 GMT
std::time_put<wchar_t>: Do 25 Nov 2004 17:40:29 GMT

$ LANG=ru_RU LC_ALL=ru_RU ./date3
asctime:                Fri Nov 26 00:14:07 2004
strftime:               Ð?Ñ?н 26 Ð?оÑ? 2004 00:14:07
std::time_put<char>:    Ð?Ñ?н 26 Ð?оÑ? 2004 00:14:07
std::time_put<wchar_t>: B= 26 >O 2004 00:14:07

(For GCC 3.3.5)
$ LANG=ru_RU LC_ALL=ru_RU ./date3
asctime:                Thu Nov 25 17:50:55 2004
strftime:               ЧÑ?в 25 Ð?оÑ? 2004 17:50:55
std::time_put<char>:    ЧÑ?в 25 Ð?оÑ? 2004 17:50:55
std::time_put<wchar_t>: 

For some reason, the Russian Cyrillic didn't work correctly with
wide streams, but it's an improvement over GCC 3.3.5 (which failed
to output anything).  However, there's still a problem outputting
proper UTF-8 codes for non-ASCII characters.

Environment:
System: Linux whinlatter 2.6.9 #7 Mon Oct 25 23:49:41 BST 2004 i686 GNU/Linux
Architecture: i686

	
host: i486-pc-linux-gnu
build: i486-pc-linux-gnu
target: i486-pc-linux-gnu
configured with: ../src/configure -v --enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr --libexecdir=/usr/lib --with-gxx-include-dir=/usr/include/c++/3.4 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --program-suffix=-3.4 --enable-__cxa_atexit --enable-libstdcxx-allocator=mt --enable-clocale=gnu --enable-libstdcxx-debug --enable-java-gc=boehm --enable-java-awt=gtk --disable-werror i486-linux

How-To-Repeat:
The following code should illustrate the problem.  Please note I
only tested on GNU/Linux with GNU libc and UTF-8 locales.  The
problem might be GNU/Linux-specific and/or cover other codesets.


#include <iostream>
#include <locale>
#include <ctime>

int main()
{
  // Set up locale stuff...
  std::locale::global(std::locale(""));
  std::cout.imbue(std::locale());
  std::wcout.imbue(std::locale());

  // Get current time
  time_t simpletime = time(0);

  // Break down time.
  std::tm brokentime;
  localtime_r(&simpletime, &brokentime);

  // Normalise.
  mktime(&brokentime);

  std::cout << "asctime:                " << asctime(&brokentime);

  // Print with strftime(3)
  char buffer[40];
  strftime(&buffer[0], 40, "%c", &brokentime);

  std::cout << "strftime:               " << &buffer[0] << '\n';

  // Try again, but use proper locale facets...
  const std::time_put<char>& tp =
    std::use_facet<std::time_put<char> >(std::cout.getloc());

  std::string pattern("std::time_put<char>:    %c\n");
  tp.put(std::cout, std::cout, std::cout.fill(),
	 &brokentime, &*pattern.begin(), &*pattern.end());

  // And again, but using wchar_t...
  const std::time_put<wchar_t>& wtp =
    std::use_facet<std::time_put<wchar_t> >(std::wcout.getloc());

  std::wstring wpattern(L"std::time_put<wchar_t>: %c\n");
  wtp.put(std::wcout, std::wcout, std::wcout.fill(),
	  &brokentime, &*wpattern.begin(), &*wpattern.end());

  return 0;
}
------- Additional Comments From rleigh at debian dot org  2004-11-26 00:21 -------
Fix:
None at this time, sorry.

Regards,
Roger

-- 
           Summary: std::time_put<wchar_t> is broken with UTF-8 locales
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rleigh at debian dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i486-pc-linux-gnu
  GCC host triplet: i486-pc-linux-gnu
GCC target triplet: i486-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18678