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Bug#373937: marked as done (libstdc++6: codecvt locale facet is broken)

Your message dated Wed, 28 Jun 2006 10:59:42 +0100
with message-id <87mzbxtxbl.fsf@hardknott.home.whinlatter.ukfsn.org>
and subject line Bug#373937: Acknowledgement (libstdc++6: codecvt locale facet is broken)
has caused the attached Bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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Debian bug tracking system administrator
(administrator, Debian Bugs database)
--- Begin Message --- 
Package: libstdc++6
Version: 4.1.1-5
Severity: important

The attached source file (UTF-8 encoded) demonstrates that codecvt
is broken for the simplest of transformations (UTF-8 to UCS-4).
This is pretty basic, and the underlying gconf stuff works correctly,
so the bug is either in libstdc++6 or somewhere inline in the headers.

$ ./wide
wide: ../iconv/loop.c:425: utf8_internal_loop_single: Assertion `inptr -
bytebuf > (state->__count & 7)' failed.
Aborted

While running:
(gdb) bt
#0  0x0fcc672c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#1  0x0fe0425c in ?? () from /lib/tls/libc.so.6
#2  0x0ffa6ef8 in std::codecvt<wchar_t, char, __mbstate_t>::do_in ()
   from /usr/lib/libstdc++.so.6
#3  0x100016b4 in std::__codecvt_abstract_base<wchar_t, char, __mbstate_t>::in
    (this=0x100290b8, __state=@0x7fa405a8, __from=0x10013014 "fffä%G�%@237»",
    __from_end=0x1001301d "", __from_next=@0x7fa405b0, __to=0x7fa405bc,
    __to_end=0x7fa406fc, __to_next=@0x7fa405b4)
    at /usr/lib/gcc/powerpc-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/codecvt.h:204
#4  0x10001244 in to_wide_string (str=@0x7fa40758, locale=@0x7fa40738)
    at wide.cc:22
#5  0x10001544 in main () at wide.cc:59

After aborting:
wide: ../iconv/loop.c:425: utf8_internal_loop_single: Assertion `inptr - bytebuf > (state->__count & 7)' failed.

Program received signal SIGABRT, Aborted.
0x0fcd67bc in raise () from /lib/tls/libc.so.6
(gdb) bt
#0  0x0fcd67bc in raise () from /lib/tls/libc.so.6
#1  0x0fcd82c0 in abort () from /lib/tls/libc.so.6
#2  0x0fcce768 in __assert_fail () from /lib/tls/libc.so.6
#3  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#4  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#5  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#6  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#7  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#8  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#9  0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#10 0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
#11 0x0fcc6c7c in __gconv_transform_utf8_internal () from /lib/tls/libc.so.6
Previous frame inner to this frame (corrupt stack?)


Regards,
Roger

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (990, 'unstable')
Architecture: powerpc (ppc)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.16.17
Locale: LANG=en_GB.UTF8, LC_CTYPE=en_GB.UTF8 (charmap=UTF-8)

Versions of packages libstdc++6 depends on:
ii  gcc-4.1-base                  4.1.1-5    The GNU Compiler Collection (base 
ii  libc6                         2.3.6-15   GNU C Library: Shared libraries
ii  libgcc1                       1:4.1.1-5  GCC support library

libstdc++6 recommends no packages.

-- no debconf information

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

std::wstring
to_wide_string (std::string const& str,
		std::locale        locale)
{
  typedef std::codecvt<wchar_t, char, mbstate_t> codecvt_type;
  codecvt_type const& cvt = std::use_facet<codecvt_type>(locale);
  mbstate_t state;
  const char *cbegin = str.data(), *cend = str.data() + str.size(), *cnext;
  wchar_t *wcnext;
  wchar_t wcbuf[80];
  std::wstring ret;

  while (1)
    {
      std::codecvt_base::result res =
	cvt.in(state,
	       cbegin, cend, cnext,
	       wcbuf, wcbuf + (sizeof(wcbuf) / sizeof(wcbuf[0])), wcnext);

      if (res == std::codecvt_base::ok || std::codecvt_base::partial)
	{
	  std::cout << "1" << std::endl;
	  ret += std::wstring(wcbuf, wcnext);
	  if (cend == cnext)
	    break;
	}
      else if (res == std::codecvt_base::noconv)
	{
	  std::cout << "2" << std::endl;
	  ret += std::wstring(cbegin, cend);
	  break;
	}
      else if (res == std::codecvt_base::error)
	{
	  std::cout << "3" << std::endl;
	  break;
	}
      else
	break;

      std::cout << "4" << std::endl;
      cbegin = cnext;
    }

  return ret;
}

int main()
{
  std::locale::global(std::locale(""));
  std::cout.imbue(std::locale());
  std::wcerr.imbue(std::locale());

  std::string foo = "fffäß»";
  std::wstring wfoo = to_wide_string(foo, std::wcerr.getloc());

  std::cout << foo;
  std::wcerr << wfoo;

  return 0;
}

--- End Message ---
--- Begin Message --- 
Version: 4.1.1-5

Martin Michlmayr <tbm@cyrius.com> writes:

> * Thiemo Seufer <ths@networkno.de> [2006-06-18 01:55]:
>> I tried wide3.c on mips and got a similiar failure pattern. However,
>> passing NULL as state to mbsnrtowcs, or initialising the state with
>> memset to zero made it work.
>
> Should this bug report be closed as user error?

Yes, my testcase failed to initialise mbstate correctly.


Regards,
Roger

-- 
Roger Leigh
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