getline et tabulation

Pas de probleme ici:
Code:
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$ cat salseropom.cpp 
#include <string>
#include <iostream>
#include <ctype.h>
int main()
{
    std::string line;
    while (std::getline(std::cin, line)) {
        for (std::string::iterator i = line.begin(),
                 e = line.end();
             i != e; ++i)
        {
            if (isgraph(*i))
                std::cout << *i;
            else
                std::cout << "\\0x" << std::hex << (int) *i;
        }
        std::cout << '\n';
    }
    return 0;
}
$ g++ salseropom.cpp
$ ./a.out
toto titi
toto\0x20titi
toto    titi
toto\0x9titi