Reading file

I need to scan an entire text file and I would like to know which is the best between copying the whole thing into memory and loading it part by part.
The file is not, or at least I don't think it could be, a large file, it is some sort of simple script for some simple tasks... (actually, it does not have a real goal except to make me discover a little more about programming)

Thanks to all who will answer this.

File IO is slow but if the file is not large compared to the read size, it should not be a problem.

I prefer to grenerally

find the file size,
alloc a buffer,
open,
read entire file,
close file,
process data,
free mem.

For windows, lookup the functions

CreateFile()
ReadFile()

I believe those are the functions

novacain >
Thanks, I think I can do it that way.

neandrake >
I already know the functions. ^^ Just posted the question here because maybe I could get some platform specific stuffs but, don't seem to. Thanks anyway.

try file mapping
CreateFileMapping
MapViewOfFile