Practical C Programming

How to do it...

Here are the steps to write a program to avoid vulnerabilities while creating a file in C:

1. A file pointer is defined.
2. The hacker might create a soft link and attach a sensitive file to the file that we want to create.
3. Remove the links from the file that you want to write in.
4. Open the file using the flags that check whether the file already exists or not. If the file exists, it should be overwritten.
5. Associate the file descriptor with the file stream.
6. Prompt the user to enter the lines of text to be written into the file.
7. Write the lines entered by the user into the file.
8. Repeat steps 5 and 6 until the user enters stop.
9. Close the file pointed to by the file pointer, fp.

The following is the program that removes vulnerabilities ...