Function namei_getpath

freebsd/kern/vfs_lookup.c:439–475

}

static int
namei_getpath(struct nameidata *ndp)
{
	struct componentname *cnp;
	int error;

	cnp = &ndp->ni_cnd;

	/*
	 * Get a buffer for the name to be translated, and copy the
	 * name into the buffer.
	 */
	cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
	if (ndp->ni_segflg == UIO_SYSSPACE) {
		error = copystr(ndp->ni_dirp, cnp->cn_pnbuf, MAXPATHLEN,
		    &ndp->ni_pathlen);
	} else {
		error = copyinstr(ndp->ni_dirp, cnp->cn_pnbuf, MAXPATHLEN,
		    &ndp->ni_pathlen);
	}

	if (__predict_false(error != 0)) {
		namei_cleanup_cnp(cnp);
		return (error);
	}

	/*
	 * Don't allow empty pathnames.
	 */
	if (__predict_false(*cnp->cn_pnbuf == '\0')) {
		namei_cleanup_cnp(cnp);
		return (ENOENT);
	}

	cnp->cn_nameptr = cnp->cn_pnbuf;
	return (0);
}

/*
 * Convert a pathname into a pointer to a locked vnode.