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From "Farid Zaripov (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-514) basic_stringbuf<>::str() deallocating external buffer
Date Thu, 09 Aug 2007 13:55:42 GMT
basic_stringbuf<>::str() deallocating external buffer
-----------------------------------------------------

                 Key: STDCXX-514
                 URL: https://issues.apache.org/jira/browse/STDCXX-514
             Project: C++ Standard Library
          Issue Type: Bug
          Components: 27. Input/Output
    Affects Versions: 4.1.3
         Environment: All
            Reporter: Farid Zaripov
            Assignee: Farid Zaripov
             Fix For: 4.2


The program below aborts due to deallocating the external buffer extbuf.

test.cpp:
------------------
#include <sstream>  // for stringbuf
#include <memory>   // for allocator

#include <cassert>  // for assert()

struct MyAlloc : std::allocator <char>
{
    static char      __buf [512];
    static size_type __used_n;

    pointer allocate (size_type __n, std::allocator<void>::const_pointer = 0) {
        assert (!__used_n);
	assert (sizeof (__buf) >= __n * sizeof (value_type));
        __used_n = __n;
        return __buf;
    }

    void deallocate (pointer __p, size_type __n)
    {
        if (__p) {
            assert (__buf == __p);
            assert (__used_n == __n);
	    __used_n = 0;
        }
    }
};

MyAlloc::size_type MyAlloc::__used_n = 0;
char MyAlloc::__buf [512];

int main ()
{
    char extbuf [3];
    std::basic_stringbuf <char, std::char_traits <char>, MyAlloc> sbuf;

    sbuf.pubsetbuf (extbuf, sizeof (extbuf));
    
    // stdcxx extension used: basic_stringbuf::str (const char*, size_t)
    sbuf.str ("abcdef", 6);

    return 0;
}
------------------

The test output:
------------------
test: test.cpp:21: void MyAlloc::deallocate(char*, unsigned int): Assertion `__buf == __p'
failed.
Aborted
------------------


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