[STDCXX-795] std::basic_stringbuf::overflow() writes characters at the begin, 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: 4.2.1
• Component/s: 27. Input/Output

Environment

All

• Severity: Incorrect Behavior
• Assignee: Farid Zaripov
• Reporter: Farid Zaripov
• Created: 25/Mar/08 14:24
• Updated: 17/Apr/08 10:01
• Resolved: 25/Mar/08 14:42

Description

From http://www.mail-archive.com/[e-mail]/msg00014.html

The test below asserts on i = 513

test.cpp

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

int main ()
{
    std::ostringstream strm;
    std::string s;

    for (size_t i = 1; i <= 1024; ++i) {
        const char c = char (i);
        strm << c;
        s.push_back (c);
        assert (strm.str () == s);
    }

    return 0;
}

The test output:

test: test.cpp:14: int main (): Assertion `strm.str () == s' failed.
Aborted

Issue Links

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