http://llvm.org/bugs/show_bug.cgi?id=13602
Bug #: 13602
Summary: basic_filebuf's internal buffer is shrinking when
using with some codecvt.
Product: libc++
Version: unspecified
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
When I replace the codecvt in fstream with my custom codecvt which is
converting char to char32_t, internal representation buffer size keep
shrinking.
In fstream header file, underflow() call fread with egptr()-eback() as buffer
size and call codecvt->in() with egptr() as buffer end. Because internal
representation can be fewer characters than external representation, so
calculating read size by egptr() result in buffer shrinking. It should be
replace by __ibs_ and eback()+__ibs_ respectively.
line 594
size_t __nmemb = _VSTD::min(static_cast<size_t>(this->egptr() - this->eback() -
__unget_sz), static_cast<size_t>(__extbufend_ - __extbufnext_));
this->egptr() - this->back() should be replaced by __ibs_
line 603
__r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
this->eback() + __unget_sz,
this->egptr(), __inext);
this->egptr() need to be replaced by this->eback() + __ibs_
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