[STDCXX-515] std::basic_streambuf<>::xsputn() writes characters at the end, but not at the current position if reallocation of internal buffer occurs

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.2.0
• Fix Version/s: 4.2.0
• Component/s: 27. Input/Output

Environment

All

• Assignee: Farid Zaripov
• Reporter: Farid Zaripov
• Created: 09/Aug/07 16:37
• Updated: 25/Mar/08 14:25
• Resolved: 28/Aug/07 18:21

Description

The test below asserts on i == 512.

test.cpp

#include <sstream>
#include <string>
#include <cassert>

int main ()
{
    for (size_t i = 1; i <= 1024; ++i) {
        std::stringstream strm;
        std::string s (i, 'a');
        strm << s;
        strm.seekp (-1, std::ios::cur);
        s.erase (0, 1);
        strm << "bc";
        s.append ("bc");
        assert (strm.str () == s);
    }

    return 0;
}

The test output:

test: test.cpp:15: int main (): Assertion `strm.str () == s' failed.
Aborted

Issue Links

• relates to: STDCXX-795 std::basic_stringbuf::overflow() writes characters at the begin, but not at the current position if reallocation of internal buffer occurs