[jira] Updated: (STDCXX-435) [Linux] std::codecvt_byname("*.UTF-8").in() to_next greater than expected

["Martin Sebor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/STDCXX-435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Sebor updated STDCXX-435:
--------------------------------

    Remaining Estimate: 8h
     Original Estimate: 8h

> [Linux] std::codecvt_byname("*.UTF-8").in() to_next greater than expected
> -------------------------------------------------------------------------
>
>                 Key: STDCXX-435
>                 URL: https://issues.apache.org/jira/browse/STDCXX-435
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.1.3
>         Environment: gcc version 4.1.1 20070105 (Red Hat 4.1.1-51)
>            Reporter: Mark Brown
>            Assignee: Martin Sebor
>            Priority: Critical
>             Fix For: 4.2.1
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> When compiled with gcc 4.1.1 on Linux the program below runs successfully to completion as it should. When compiled with stdcxx the facet returns  a to_next value that is greater than the number of internal (wchar_t) characters actually produced by the conversion and consequently the program aborts.
> $ cat t.cpp && make t && ./t
> #include <cassert>
> #include <cwchar>
> #include <locale>
> int main ()
> {
>     const std::locale utf8 ("en_US.UTF-8");
>     typedef std::codecvt<wchar_t, char, std::mbstate_t> UTF8_Cvt;
>     const UTF8_Cvt &cvt = std::use_facet<UTF8_Cvt>(utf8);
>     const char src[] = "abc";
>     wchar_t dst [2] = { L'\0' };
>     const char* from_next;
>     wchar_t* to_next;
>     std::mbstate_t state = std::mbstate_t ();
>     const std::codecvt_base::result res =
>         cvt.in (state,
>                 src, src + 1, from_next,
>                 dst, dst + 2, to_next);
>     assert (1 == from_next - src);
>     assert (1 == to_next - dst);
>     assert ('a' == dst [0]);
> }
> gcc -c -I/home/mbrown/stdcxx/include/ansi -D_RWSTDDEBUG    -I/home/mbrown/stdcxx/include -I/build/mbrown/stdcxx-gcc-4.1.1-11S/include -I/home/mbrown/stdcxx/examples/include  -pedantic -nostdinc++ -g   -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long -Wcast-align   t.cpp
> t.cpp: In function 'int main()':
> t.cpp:21: warning: unused variable 'res'
> gcc t.o -o t  -L/build/mbrown/stdcxx-gcc-4.1.1-11S/lib  -lstd11S -lsupc++ -lm 
> t: t.cpp:26: int main(): Assertion `1 == from_next - src' failed.
> Aborted

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