Buffered reading from stdin using fread in C

Question

I am trying to efficiently read from the stdin by using setvbuf in `_IOFBF~ mode. I am new to buffering. I am looking for working examples

Answer 1

The outermost while() loop will only exit when the read from stdin returns EOF. This can only happen when reaching the actual end-of-file on an input file, or if the process writing to an input pipe exits. Hence the printf() statement is never executed. I don't think this has anything to do with the call to setvbuf().