How to check if C string is empty

Question

I\'m writing a very small program in C that needs to check if a certain string is empty. For the sake of this question, I\'ve simplified my code:

#include 

        

Answer 1

First replace the scanf() with fgets() ...

do {
    if (!fgets(url, sizeof url, stdin)) /* error */;
    /* ... */
} while (*url != '\n');