I've made a Linked List. Its elements keep both previous and next items' address. It gets commands from an input file. It detects the command and uses the following statement as a parameter. (text: add_to_front john -> means: add_to_front(john))

Code: http://pastebin.com/KcAm1y3L

When I try to give the commands from an input file it gives me same output over and over. However, if I write inputs in main() manually, it works.

For ex input file:

add_to_front john
add_to_back jane
add_to_back jane
print

(unfortunately) the output is:

>add_to_front john
>add_to_back jane
>add_to_back jane
>print
 jane
 jane
 jane

Although, if I write

add_to_front(john);
add_to_back(jane);
add_to_back(jane);
print();

instead of this command check:

while (scanf("%s",command)!=EOF)
{
    if (strcmp(command,"add_to_front")==0)
    {
        gets(parameter);
        add_to_front(parameter);
    }
    else if (strcmp(command,"add_to_back")==0)
    {
        gets(parameter);
        add_to_back(parameter);
    }
    else if (strcmp(command,"remove_from_back")==0)
        remove_from_back(parameter);
    ...
        printf(" HUH?\n");
    }
}

in main() it gives the correct output.

I know it's a lot to ask but this thing is bothering me for 2 days. What do you think i'm doing wrong?