Resetting pointer to the start of file

Question

How would I be able to reset a pointer to the start of a commandline input or file. For example my function is reading in a line from a file and prints it out using getchar(

Answer 1

Piped / redirected input doesn't work like that. Your options are:

• Read the input into an internal buffer (which you already seem to be doing); or
• Pass the file name as a command-line argument instead, and do with it as you please.