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: 4.2.0, 4.1.4, 4.1.3, 4.1.2
Environment: All
Reporter: Farid Zaripov
Assignee: Farid Zaripov
Fix For: 4.2.1
The 22.locale.ctype.narrow test fails 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. 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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