Question

I have a program that either takes data from a file or from the standard input.
I wrote code for scanning the file using sscanf.
I was wondering if I could reuse that code but with stdin instead of using scanf?

Ex:

How could I modify this so that it works with standard input?

while(fgets(buffer, MAX_LEN, input) != NULL) { 
    if (sscanf(buffer, "%s %s %s", one, two, three) == 3) { } 
}

Answer 1

You don’t need to change the sscanf() call – it’s the fgets() call that is reading from the input file.

You can change your code snippet to work with stdin by literally replacing input with stdin in the fgets() call (stdin is a global FILE * declared in stdio.h that refers to standard input).