Changing working directories in Linux shell in a C…

My goal is to write a C program that is like a basic shell for Linux. I have everything working except changing working directories. I have tried the system() for input strings for cd and nothing happened. I also tried chdir("tokened string") and also no luck. Anyone have any ideas? This is part of my code:

        fgets(cmdStr, sizeof(cmdStr), stdin);

        if( strncmp("quit", cmdStr, 4) == 0 || strncmp("Quit", cmdStr, 4) == 0  )
        {
            break;
        }
        else if( strncmp("cd", cmdStr, 2) == 0 )
        {
            char *token = strtok(cmdStr, " ");
            token = strtok(NULL, " ");
            chdir(token);
        }
        else
        {
            system(cmdStr);
        }
    }

Is it possible to do this? Or is this a simple case of something to do with the child shell not being able to do certain things?

Edit: Code above is complete.

Answer

fgets() leaves the trailing 'n' character in cmdstr.

If you type cd foo, you’ll call chdir("foon") rather than chdir("foo").

Changing working directories in Linux shell in a C program

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Answer