[jira] Closed: (STDCXX-854) incorrect using the caching array in ctype::narrow(wchar_t, char)

["Farid Zaripov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/STDCXX-854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Farid Zaripov closed STDCXX-854.
--------------------------------


> incorrect using the caching array in ctype<wchar_t>::narrow(wchar_t, char)
> --------------------------------------------------------------------------
>
>                 Key: STDCXX-854
>                 URL: https://issues.apache.org/jira/browse/STDCXX-854
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
>         Environment: All
>            Reporter: Farid Zaripov
>            Assignee: Farid Zaripov
>             Fix For: 4.2.1
>
>   Original Estimate: 1h
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> The 22.locale.ctype and 22.locale.ctype.narrow tests are failing with number of assertions. The reason is casting the at least 16-bit wchar_t value to 8-bit unsigned char and using this value as index in cache table in ctype<wchar_t>::narrow(wchar_t, char). As a result the index always fits the table of size 256 elements.
> The proposed patch:
> {noformat}
> Index: include/loc/_ctype.h
> ===================================================================
> --- include/loc/_ctype.h	(revision 646660)
> +++ include/loc/_ctype.h	(working copy)
> @@ -541,20 +541,21 @@
>  inline char
>  ctype<wchar_t>::narrow (char_type __c, char __dfault) const
>  {
> -    const _RWSTD_SIZE_T __inx = _RWSTD_STATIC_CAST (unsigned char, __c);
> -
>      // optimize away all but the first call to the virtual do_widen()
> -    if (   __inx < sizeof _C_narrow_tab / sizeof *_C_narrow_tab
> -        && _C_narrow_tab [__inx])
> -        return _C_narrow_tab [__inx];
> +    if (   0 <= __c
> +        && __c < sizeof _C_narrow_tab / sizeof *_C_narrow_tab
> +        && _C_narrow_tab [__c])
> +        return _C_narrow_tab [__c];
>  
>      // template argument provided to work around an HP aCC bug (PR #27087)
>      ctype<wchar_t>* const __self = _RWSTD_CONST_CAST (ctype<wchar_t>*, this);
>  
>      const char __ch = do_narrow (__c, __dfault);
>  
> -    if (__inx < sizeof _C_narrow_tab / sizeof *_C_narrow_tab && __ch != __dfault)
> -        __self->_C_narrow_tab [__inx] = __ch;
> +    if (   0 <= __c
> +        && __c < sizeof _C_narrow_tab / sizeof *_C_narrow_tab
> +        && __ch != __dfault)
> +        __self->_C_narrow_tab [__c] = __ch;
>  
>      return __ch;
>  }
> {noformat}

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