[jira] Closed: (STDCXX-576) std::basic_streambuf<>::xsputn() incorrectly inserts the data, that is the part of the internal buffer

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

     [ https://issues.apache.org/jira/browse/STDCXX-576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Farid Zaripov closed STDCXX-576.
--------------------------------


> std::basic_streambuf<>::xsputn() incorrectly inserts the data, that is the part of the internal buffer
> ------------------------------------------------------------------------------------------------------
>
>                 Key: STDCXX-576
>                 URL: https://issues.apache.org/jira/browse/STDCXX-576
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 27. Input/Output
>    Affects Versions: trunk
>         Environment: All
>            Reporter: Farid Zaripov
>            Assignee: Farid Zaripov
>             Fix For: 4.2
>
>         Attachments: 27.stringbuf.xsputn.stdcxx-576.cpp, sstream.cc.diff
>
>
> The test below aborts on assert. 
> test.cpp:
> ------------------ 
> #include <sstream>  // for stringbuf
> #include <string>   // for string
> #include <cassert>  // for assert()
> struct PubBuf: std::stringbuf
> {
>     char* Pbase () const { return this->pbase (); }
> };
> int main ()
> {
>     // 512 is the default buffer size of the basic_stringbuf
>     std::string s (512, 'a');
>     std::stringbuf sbuf (s);
>     PubBuf& buf = (PubBuf&)sbuf;
>     std::streamsize res = buf.sputn (buf.Pbase (), 128);
>     s.append (s.begin (), s.begin () + 128);
>     const std::string& str = buf.str ();
>     assert (res == 128);
>     assert (str.size () == s.size ());
>     assert (str == s);
>     return 0;
> } 
> ------------------ 
> The test output:
> ------------------
> test: test.cpp:25: int main (): Assertion `str == s' failed.
> Aborted
> ------------------

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