#include <unistd.h> // for chdir, ...
#include <errno.h>  // for errno
#include <cstring>  // for strerror C++
#include <cerrno>   // for strerror C++
//#include <string.h> // for strerror c
#include <string>
#include <iostream>

using namespace std;

void PrintCurrentDir(void);
void ChangeTo(const string & newDir);

int main() {
    string newDir;

    while (newDir != "QUIT") {
       PrintCurrentDir();
       getline(cin,newDir);
       if (newDir != "QUIT") {
           ChangeTo(newDir);
       }
    }

    return 0;
}

void PrintCurrentDir(void){
    char * name;

    name = get_current_dir_name();
    if (nullptr != name) {
        cout << "[ " << name << " ] >";
        cout << flush ;
        free(name);
    } else {
        perror("\tget_current_dir_name failed:");
        cerr << "\tThe error number is " << errno << endl;
        cerr << "\tAnd the string is " << strerror(errno) << endl;
    }
    return;
}

void ChangeTo(const string & cmd){
    if (0 != chdir(cmd.c_str())) {
        perror("\tchdir failed:");
        cerr << "\tThe target was " << cmd << endl;
        cerr << "\tThe error number is " << errno << endl;
        cerr << "\tAnd the string is " << strerror(errno) << endl;
    }
    return;
}