Execute Tokenize Command

Question

First of all, I'm new to C so pardon me if asking too much.

I have a function that tokenize an input by the user so let's say

user input: test -f myFile

then after the tokenize function it becomes

abc[0] = test
abc[1] = -f
abc[2] = myFile

However, at the same time, I also need to use the return value from that input (test) statement whether it is FALSE or TRUE (file exist or not exist).

I did (MY PROBLEM)

if (*abc != '1') {
    printf ("nope.");
}

in hope for telling me first whether that file is valid / exist or not, before I call some other function. However, it says warning comparison between pointer and integer.

My original plan is:

// ask the user for input

// tokenize the input

if (*abc != '1') { // check the return value from the input
        printf ("nope.");
    }

// call another function

Any input why MYPROBLEM doesn't work? How do I execute test after I tokenize?

http://stackoverflow.com/questions/230062/whats-the-best-way-to-check-if-a-file-exists-in-c-cross-platform — Alexguitar, Nov 22 '15 at 18:34

score 0 · Answer 1 · answered Nov 22 '15 at 18:35

If you want to check whether anything was added to abc, you would have to initialize your array to NULs prior to calling tokenize and then afterwards, if (**abc == '\0') would tell you that nothing was tokenized.

However, it's probably better for your tokenize function to return a flag that indicates success or failure in addition to populating your array.

As for executing test, you can use the system() function or one of the exec() functions.

Execute Tokenize Command

1 Answers1