use libc::{FILE, fread, feof, ferror};

#[no_mangle]
pub extern "C" fn read_all_from_file(file: *mut FILE) -> bool {
    let mut buf = [0u8; 1 << 12];
    let mut r = 0;
    println!("fread() starts");
    while unsafe { feof(file) } == 0 {
        let hr = unsafe { fread(buf.as_mut_ptr().cast(), 1, 1 << 12, file) };
        println!("fread() got {} bytes", hr);
        if hr == 0 {
            if unsafe { feof(file) } != 0 {
                println!("feof(file) returns non-zero");
		            break;
            }
            if unsafe { ferror(file) } != 0 {
                println!("ferror() returns non-zero");
                return false;
            }
        } else {
            r += hr;
        }
    }
    println!("fread() got {} bytes totally", r);
    true
}