[Bug c++/35353] New: C++ wide character locale doesn't work

[Bug c++/35353] New: C++ wide character locale doesn't work

[ivranos at freemail dot gr]

The following code works:

#include <iostream>
#include <clocale>
#include <string>

int main()
{
    using namespace std;

    char *p= setlocale( LC_ALL, "greek" );

    if (!p)
      cerr<< "NULL returned!\n";

    wstring ws;

    wcin>> ws;

    wcout<< ws<< endl;
} 

[john@localhost src]$ ./foobar-cpp 
&#916;&#959;&#954;&#953;&#956;&#945;&#963;&#964;&#953;&#954;&#972;
&#916;&#959;&#954;&#953;&#956;&#945;&#963;&#964;&#953;&#954;&#972;
[john@localhost src]$ 



The following code DOES NOT work:

#include <iostream>
#include <locale>
#include <string>

int main()
{
    using namespace std;

    wcout.imbue(locale("greek")); 

    wstring ws;

    wcin>> ws;

    wcout<< ws<< endl;
} 


[john@localhost src]$ ./foobar-cpp 
&#916;&#959;&#954;&#953;&#956;&#945;&#963;&#964;&#953;&#954;&#972;

[john@localhost src]$ 


For the code that does not work:

[john@localhost src]$ g++ -v -save-temps -ansi -pedantic-errors -Wall main.cc
-o foobar-cpp 
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic
--host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)
 /usr/libexec/gcc/i386-redhat-linux/4.1.2/cc1plus -E -quiet -v -D_GNU_SOURCE
main.cc -mtune=generic -ansi -pedantic-errors -Wall -fpch-preprocess -o main.ii
ignoring nonexistent directory
"/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../include/c++/4.1.2

/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../include/c++/4.1.2/i386-redhat-linux
 /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../include/c++/4.1.2/backward
 /usr/local/include
 /usr/lib/gcc/i386-redhat-linux/4.1.2/include
 /usr/include
End of search list.
 /usr/libexec/gcc/i386-redhat-linux/4.1.2/cc1plus -fpreprocessed main.ii -quiet
-dumpbase main.cc -mtune=generic -ansi -auxbase main -pedantic-errors -Wall
-ansi -version -o main.s
GNU C++ version 4.1.2 20070626 (Red Hat 4.1.2-14) (i386-redhat-linux)
        compiled by GNU C version 4.1.2 20070626 (Red Hat 4.1.2-14).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129413
Compiler executable checksum: a9d7d7ea3146608fff5ae7eec9c8ae61
 as -V -Qy -o main.o main.s
GNU assembler version 2.17.50.0.6-5.el5 (i386-redhat-linux) using BFD version
2.17.50.0.6-5.el5 20061020
 /usr/libexec/gcc/i386-redhat-linux/4.1.2/collect2 --eh-frame-hdr -m elf_i386
--hash-style=gnu -dynamic-linker /lib/ld-linux.so.2 -o foobar-cpp
/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crt1.o
/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crti.o
/usr/lib/gcc/i386-redhat-linux/4.1.2/crtbegin.o
-L/usr/lib/gcc/i386-redhat-linux/4.1.2 -L/usr/lib/gcc/i386-redhat-linux/4.1.2
-L/usr/lib/gcc/i386-redhat-linux/4.1.2/../../.. main.o -lstdc++ -lm -lgcc_s
-lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/i386-redhat-linux/4.1.2/crtend.o
/usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crtn.o
[john@localhost src]$


-- 
           Summary: C++ wide character locale doesn't work
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ivranos at freemail dot gr


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug c++/35353] C++ wide character locale doesn't work

[ivranos at freemail dot gr]

------- Comment #1 from ivranos at freemail dot gr  2008-02-24 14:11 -------
Created an attachment (id=15217)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15217&action=view)
The main.ii file produced by  -save-temps option

This is the file created by the 

g++ -v -save-temps -ansi -pedantic-errors -Wall main.cc -o foobar-cpp 

command, on the non-working code.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug c++/35353] C++ wide character locale doesn't work

[ivranos at freemail dot gr]

------- Comment #2 from ivranos at freemail dot gr  2008-02-24 14:15 -------
Created an attachment (id=15218)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15218&action=view)
The produced main.s file

The main.s file produced by "g++ -v -save-temps -ansi -pedantic-errors -Wall
main.cc -o foobar-cpp"


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug c++/35353] C++ wide character locale doesn't work

[pcarlini at suse dot de]

------- Comment #3 from pcarlini at suse dot de  2008-02-24 14:18 -------
Not a bug, given our implementation-defined behavior: the various cin / wcin,
streams are by default synced with stdio (per the standard requirements) and
thus not converting. You can either call sync_with_stdio(false) before any I/O
or use converting stream, like fstreams.


-- 

pcarlini at suse dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug c++/35353] C++ wide character locale doesn't work

[ivranos at freemail dot gr]

------- Comment #4 from ivranos at freemail dot gr  2008-02-24 14:23 -------
Created an attachment (id=15219)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15219&action=view)
Screenshot of the standard I/O of the working code and of the non-working code.

This screenshot shows the I/O of the working code and of the non-working code
respectively.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug c++/35353] C++ wide character locale doesn't work

[ivranos at freemail dot gr]

------- Comment #5 from ivranos at freemail dot gr  2008-02-24 14:35 -------
sync_with_stdio (false) doesn't work. Actually it crashes the code.

Check the screenshot I have attached in the latest attachment, to see the
difference between the C++ working code and the C++ non-working code.


-- 

ivranos at freemail dot gr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ivranos at freemail dot gr
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug c++/35353] C++ wide character locale doesn't work

[pcarlini at suse dot de]

------- Comment #6 from pcarlini at suse dot de  2008-02-24 14:40 -------
sync_with_stdio(false) works, and is tested dozens of times a day in our
testsuites. And that is only half of my answer. Please understand what I said,
study the details of the ISO C++ Standard and then come back.


-- 

pcarlini at suse dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[ivranos at freemail dot gr]

------- Comment #7 from ivranos at freemail dot gr  2008-02-25 12:02 -------
I am sorry for insisting on this, but I think there is an issue, and I want the
best for GCC. So please have a look at the messages of this link:

http://tinyurl.com/384u3n and use Unicode (UTF-8) character encoding in your
browser, to see the issues.


Thanks.


-- 

ivranos at freemail dot gr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[ivranos at freemail dot gr]

------- Comment #8 from ivranos at freemail dot gr  2008-02-25 12:12 -------
Summary of the case:

What doesn't work:

#include <iostream>
#include <locale>
#include <string>


int main()
{
    using namespace std;



    wcin.imbue(locale("greek"));
    wcout.imbue(locale("greek"));

    wstring ws;

    wcin>> ws;

    wcout<< ws<< endl;
} 


What works (under 2 conditions):

1. Only when "locale::global()" statement is used:

#include <iostream>
#include <locale>
#include <string>


int main()
{
    using namespace std;

    locale::global(locale("en_US"));

    wcin.imbue(locale("greek"));
    wcout.imbue(locale("greek"));

    wstring ws;

    wcin>> ws;

    wcout<< ws<< endl;
} 


2. Only when "ios_base::sync_with_stdio(false)" statement is used.

#include <iostream>
#include <locale>
#include <string>


int main()
{
    using namespace std;

    ios_base::sync_with_stdio(false);

    wcin.imbue(locale("greek"));
    wcout.imbue(locale("greek"));

    wstring ws;

    wcin>> ws;

    wcout<< ws<< endl;
} 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[pcarlini at suse dot de]

-- 

pcarlini at suse dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |SUSPENDED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[pcarlini at suse dot de]

------- Comment #9 from pcarlini at suse dot de  2008-02-25 12:44 -------
Maybe we can improve the behavior when the stdio is synced, that is we can
transcode each wchar_t and sync after each transcoding. Very likely, you can
also simulate that behavior right now by using sync_with_stdio(false) + a
custom single-char I/O buffer. In any case, any enhancement will be implemented
only when the binary compatibility will be broken.


-- 

pcarlini at suse dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |enhancement
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-02-25 12:44:30
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[pcarlini at suse dot de]

------- Comment #10 from pcarlini at suse dot de  2008-02-25 13:11 -------
Note, anyway, that there is a serious blocker to any enhancement in this area
(and of course it explains the current behavior): if wcin & co are converting,
they deal with the underlying stream as a narrow-character oriented stream. But
when the stream is synced it must be possible to mix char-by-char with wchar_t
C stdio operations, which require a wide-character orientation of the stream,
whereas, per C99 7.19.2, the orientation of a stream cannot be changed after
opening.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[pcarlini at suse dot de]

------- Comment #11 from pcarlini at suse dot de  2008-02-25 14:18 -------
About my last reply: I checked, and within the current implementation of the
underlying I/O the last issue (per libstdc++/9662) doesn't exist anymore, in
other terms, when sync_with_stdio(false), C++ I/O on wcin/wcout doesn't change
the orientation of the stream to byte (i.e, fwide < 0). Good.

We have re-investigate all the other reasons that led to the separate
non-converting synced (default) implementation of wcin & co...


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[paolo dot carlini at oracle dot com]

------- Comment #12 from paolo dot carlini at oracle dot com  2008-08-31 18:15 -------
*** Bug 37298 has been marked as a duplicate of this bug. ***


-- 

paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jaworski at autograf dot pl


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[paolo dot carlini at oracle dot com]

------- Comment #13 from paolo dot carlini at oracle dot com  2008-09-30 10:21 -------
*** Bug 37673 has been marked as a duplicate of this bug. ***


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[paolo dot carlini at oracle dot com]

-- 

paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|SUSPENDED                   |NEW
   Last reconfirmed|2008-02-25 12:44:30         |2009-09-14 21:10:27
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[paolo dot carlini at oracle dot com]

------- Comment #14 from paolo dot carlini at oracle dot com  2010-02-21 01:31 -------
*** Bug 33852 has been marked as a duplicate of this bug. ***


-- 

paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |siegerstein at pochta dot ru


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[luca dot barbieri at gmail dot com]

------- Comment #15 from luca dot barbieri at gmail dot com  2010-04-08 02:33 -------
Why can't wcout simply convert to the selected encoding, and append the results
to the cout buffer, as if the converted string had been directly output to
cout?

I'm not sure about the implementation details, but I fail to see how anything
could prevent adopting this rather obvious solution.

Of course, if cout is in the middle of the byte sequence of a character, this
will not result in sensible output, but that is user error and I fail to see
how such use could be made meaningful.

BTW, doesn't cout share the stdout buffer via the GNU libio FILE/iostream
sharing mechanism, making sync_with_stdio do nothing anyway?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353

[Bug libstdc++/35353] C++ wide character locale doesn't work

[paolo dot carlini at oracle dot com]

------- Comment #16 from paolo dot carlini at oracle dot com  2010-04-08 09:44 -------
We may make progress on this for 4.6.0, but I don't make promises. If, after
having studied the relevant bits of the Standard and the current implementation
of these features (I remind you that this is Free Software, thus no mysteries,
no need for black-box thinking) I would recommend going ahead and proposing a
patch (after having filed the required Copyright Assignment). Thanks.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35353