[Bug libstdc++/47921] pbump will overflow when input n is larger than 2G-1

[RobertPython at 163 dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47921

--- Comment #1 from Robert Python <RobertPython at 163 dot com> 2011-02-28 10:51:30 UTC ---
try below program in a 64bit environment with about 8G memory:

#include <string>
#include <strstream>
#include <iostream>

#define N 100000000
#define SIZE 40

using namespace std;

int main()
{
        const char msg[SIZE] = "aaaaaaaaaaaaaaaaaaaaaaaaaaa";
        strstreambuf *new_data = new strstreambuf();
        for (int i = 0; i < N; ++i)
        {
                new_data->freeze(false);
                new_data->sputn(msg, SIZE);
        }

        delete new_data;
        return 0;
}