#include "../file.h"

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

extern kern_status_t fs_msg_seek(
	xpc_context_t *xpc,
	const xpc_endpoint_t *sender,
	off_t rel_offset,
	int origin,
	int *out_err,
	off_t *out_new_pos,
	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;
	}

	off_t new_offset = 0;

	switch (origin) {
	case SEEK_SET:
		new_offset = rel_offset;
		break;
	case SEEK_CUR:
		new_offset = f->f_seek + rel_offset;
		break;
	case SEEK_END:
		new_offset = f->f_inode->i_size + rel_offset;
		break;
	default:
		*out_err = EINVAL;
		return KERN_OK;
	}

	if (new_offset > f->f_inode->i_size) {
		*out_err = EINVAL;
		return KERN_OK;
	}

	f->f_seek = new_offset;
	*out_err = SUCCESS;
	*out_new_pos = new_offset;

	return KERN_OK;
}