basic_stringbuf<>::str() deallocating external buffer
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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:
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#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;
}
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The test output:
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test: test.cpp:21: void MyAlloc::deallocate(char*, unsigned int): Assertion
`__buf == __p' failed.
Aborted
------------------
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