#include <errno.h>
#include <fs/context.h>
#include <fs/file.h>
#include <fs/status.h>

extern kern_status_t fs_msg_read(
	xpc_context_t *xpc,
	xpc_endpoint_t *sender,
	size_t count,
	int *out_err,
	size_t *out_nr_read,
	xpc_buffer_t *out_data,
	void *arg)
{
	struct fs_context *ctx = arg;
	struct fs_file *f = fs_context_get_file(ctx, sender->e_port);
	if (!f) {
		*out_err = EBADF;
		return KERN_OK;
	}

	size_t start = fs_file_get_cursor(f);
	enum fs_status status = fs_file_read(f, out_data, count);
	size_t end = fs_file_get_cursor(f);

	*out_err = fs_status_to_errno(status);
	*out_nr_read = end - start;

	return KERN_OK;
}