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

extern kern_status_t fs_msg_write(
	xpc_context_t *xpc,
	const xpc_endpoint_t *sender,
	const xpc_buffer_t *data,
	int *out_err,
	size_t *out_nr_written,
	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_write(f, data, data->buf_len);
	size_t end = fs_file_get_cursor(f);

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

	return KERN_OK;
}