std::basic_streambuf<>::xsputn() incorrectly inserts the data, that is the part
of the internal buffer
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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
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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