I took a class of programming at my university and I am working on some program. I want to know if it is possible to program my own kbhit() function. And if it is possible to look, how kbhit() is coded.
The purpose is that I need to know how functions I use work.
Yes and no.
C language has no notion of input and output. It relies on a standard library (essentially written in C) that in turn relies on system calls.
Neither the standard library, nor the set of system calls common to Unix-like systems and Windows deal with non blocking system calls, so you have to call system specific ones.
But again, you can call them easily from C language.
It depends.
On windows stdio (standard io, like stdin/stdout) is always blocking and thus you need to use os specific system calls to avoid a blocking call like read.
On Linux you can change stdio to be non blocking using fcntl thus avoiding the need for specialized function calls.
Yes, it is possible.
That's how it works:
It returns a non-zero integer if a key is in the keyboard buffer. It will not wait for a key to be pressed.
Basically you check from stdin (assumed to be default input data from keyboard in C language).
There is an implementation here where you can start from.
