#include "file.h"

#include <errno.h>
#include <stdio.h>

int fgetc(struct __opaque_file *stream)
{
	if (stream->f_flags & (FILE_EOF | FILE_ERR)) {
		return EOF;
	}

	size_t available = __libc_file_available(stream);
	if (available == 0) {
		int err = __libc_file_refill(stream);
		if (err != SUCCESS) {
			__set_errno(err);
			stream->f_flags |= FILE_ERR;
			return EOF;
		}

		available = __libc_file_available(stream);
	}

	if (available == 0) {
		stream->f_flags |= FILE_EOF;
		return EOF;
	}

	char c = stream->f_buf[stream->f_buf_readptr++];
	return c;
}