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Date: Sat, 26 Aug 2006 15:15:22 -0700 (PDT)
From: "Martin Sebor (JIRA)" <jira@apache.org>
To: stdcxx-dev@incubator.apache.org
Subject: [jira] Commented: (STDCXX-280) SIGABRT in codecvt::out()
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    [ http://issues.apache.org/jira/browse/STDCXX-280?page=comments#action_12430795 ] 
            
Martin Sebor commented on STDCXX-280:
-------------------------------------

Another test case with more detail and stack trace showing that the problem originates in wcsrtombs():

$ cat u.cpp && nice make u && LC_ALL=zh_CN.UTF-8@pinyin gdb -q ./u
#include <cassert>
#include <cwchar>
#include <iostream>

#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>

int main ()
{
    typedef std::codecvt<wchar_t, char, std::mbstate_t> CodeCvt;
    const std::locale loc ("");
    const CodeCvt &cvt = std::use_facet<CodeCvt>(loc);

    CodeCvt::state_type state = { };

    const int pagesize = getpagesize ();

    void* const addr =
        mmap (0, 2 * pagesize, PROT_READ | PROT_WRITE,
              MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

    assert (MAP_FAILED != addr);

    wchar_t* const from = (wchar_t*)addr + pagesize / sizeof (wchar_t) - 1;

    const wchar_t* const from_end  = from + 1;
    const wchar_t*       from_next = 0;

    from [0] = L'\n';
    from [1] = L'\377';

    assert (0 == mprotect (addr, pagesize, PROT_READ));
    assert (0 == mprotect (from + 1, pagesize, PROT_NONE));

    char        to [40];
    char* const to_limit = to + sizeof to;
    char*       to_next  = 0;

    CodeCvt::result res;

    res = cvt.out (state, from, from_end, from_next, to, to_limit, to_next);

    assert (cvt.ok == res);
    assert (from_next == from_end);
    assert (to_next == to + 1);
    assert ('\n' == *to);
}
gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/dev/stdlib/include -I/build/sebor/gcc-4.1.0-11s/include -I/build/sebor/dev/stdlib/../rwtest -I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include  -pedantic -nostdinc++ -g  -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long  u.cpp
u.cpp: In function 'int main()':
u.cpp:15: warning: missing initializer for member '__mbstate_t::__filler'
gcc u.o -o u -L/build/sebor/gcc-4.1.0-11s/rwtest -lrwtest11s  -L/build/sebor/gcc-4.1.0-11s/lib -lstd11s  -lsupc++ -lm
(gdb) run
Starting program: /build/sebor/gcc-4.1.0-11s/tests/u 

Program received signal SIGSEGV, Segmentation fault.
0xff2533c4 in __wcsrtombs_dense_utf8 ()
   from /usr/lib/locale/zh.UTF-8/methods_zh.UTF-8.so.2
(gdb) bt
#0  0xff2533c4 in __wcsrtombs_dense_utf8 ()
   from /usr/lib/locale/zh.UTF-8/methods_zh.UTF-8.so.2
#1  0x0005b764 in __rw_libc_do_out (state=@0xffbffa50, from=0xff361ffc, 
    from_end=0xff362000, from_next=@0xffbffa4c, to=0xffbffa20 "\n", 
    to_limit=0xffbffa48 " 6\037", to_next=@0xffbffa48)
    at /build/sebor/dev/stdlib/src/wcodecvt.cpp:535
#2  0x0005c1f0 in std::codecvt_byname<wchar_t, char, __mbstate_t>::do_out (
    this=0xce370, state=@0xffbffa50, from=0xff361ffc, from_end=0xff362000, 
    from_next=@0xffbffa4c, to=0xffbffa20 "\n", 
    to_limit=0xffbffa48 " 6\037", to_next=@0xffbffa48)
    at /build/sebor/dev/stdlib/src/wcodecvt.cpp:1583
#3  0x0001259c in std::codecvt<wchar_t, char, __mbstate_t>::out (this=0xce370, 
    __state=@0xffbffa50, __from=0xff361ffc, __from_end=0xff362000, 
    __from_next=@0xffbffa4c, __to=0xffbffa20 "\n", 
    __to_limit=0xffbffa48 " 6\037", __to_next=@0xffbffa48)
    at _codecvt.h:342
#4  0x0001241c in main () at u.cpp:42


> SIGABRT in codecvt::out()
> -------------------------
>
>                 Key: STDCXX-280
>                 URL: http://issues.apache.org/jira/browse/STDCXX-280
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.1.2, 4.1.3
>         Environment: all
>            Reporter: Martin Sebor
>            Priority: Critical
>
> The program below aborts on Solaris 9:
> $ cat u.cpp && make u && LC_ALL=zh_CN.UTF-8@pinyin ./u
> #include <cassert>
> #include <cwchar>
> #include <iostream>
> int main ()
> {
>     typedef std::codecvt<wchar_t, char, std::mbstate_t> CodeCvt;
>     const std::locale loc ("");
>     const CodeCvt &cvt = std::use_facet<CodeCvt>(loc);
>     CodeCvt::state_type state = { };
>     const wchar_t* const from      = L"\n\377";
>     const wchar_t* const from_end  = from + 1;
>     const wchar_t*       from_next = 0;
>     char        to [40];
>     char* const to_limit = to + sizeof to;
>     char*       to_next  = 0;
>     CodeCvt::result res;
>     res = cvt.out (state, from, from_end, from_next, to, to_limit, to_next);
>     assert (cvt.ok == res);
>     assert (from_next == from_end);
>     assert (to_next == to + 1);
>     assert ('\n' == *to);
> }
> gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/dev/stdlib/include -I/build/sebor/gcc-4.1.0-11s/include -I/build/sebor/dev/stdlib/../rwtest -I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include  -pedantic -nostdinc++ -g  -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long  u.cpp
> u.cpp: In function 'int main()':
> u.cpp:11: warning: missing initializer for member '__mbstate_t::__filler'
> gcc u.o -o u -L/build/sebor/gcc-4.1.0-11s/rwtest -lrwtest11s  -L/build/sebor/gcc-4.1.0-11s/lib -lstd11s  -lsupc++ -lm
> /build/sebor/dev/stdlib/src/wcodecvt.cpp:496: std::codecvt_base::result __rw::__rw_libc_do_out(__mbstate_t&, const wchar_t*, const wchar_t*, const wchar_t*&, char*, char*, char*&): Assertion 'from_next <= from_end' failed.
> Segmentation Fault (core dumped)

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