Add linux libspl support

[zfs.git] / lib / libspl / xdr.c

diff --git a/lib/libspl/xdr.c b/lib/libspl/xdr.c
new file mode 100644 (file)
index 0000000..288a338
--- /dev/null
+++ b/lib/libspl/xdr.c
@@ -0,0 +1,78 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ *
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ *
+ *     Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
+ *       All Rights Reserved
+ *
+ * Portions of this source code were derived from Berkeley 4.3 BSD
+ * under license from the Regents of the University of California.
+ */
+
+#include <rpc/xdr.h>
+
+/*
+ * As of glibc-2.5-25 there is not support for xdr_control().  The
+ * xdrmem implementation from OpenSolaris is used here.
+ *
+ * FIXME: Not well tested it may not work as expected.
+ */
+bool_t
+xdr_control(XDR *xdrs, int request, void *info)
+{
+       xdr_bytesrec_t *xptr;
+       int32_t *int32p;
+       int len;
+
+       switch (request) {
+       case XDR_GET_BYTES_AVAIL:
+               xptr = (xdr_bytesrec_t *)info;
+               xptr->xc_is_last_record = TRUE;
+               xptr->xc_num_avail = xdrs->x_handy;
+               return (TRUE);
+
+       case XDR_PEEK:
+               /*
+                * Return the next 4 byte unit in the XDR stream.
+                */
+               if (xdrs->x_handy < sizeof (int32_t))
+                       return (FALSE);
+               int32p = (int32_t *)info;
+               *int32p = (int32_t)ntohl((uint32_t)
+                   (*((int32_t *)(xdrs->x_private))));
+               return (TRUE);
+
+       case XDR_SKIPBYTES:
+               /*
+                * Skip the next N bytes in the XDR stream.
+                */
+               int32p = (int32_t *)info;
+               len = RNDUP((int)(*int32p));
+               if ((xdrs->x_handy -= len) < 0)
+                       return (FALSE);
+               xdrs->x_private += len;
+               return (TRUE);
+
+       }
+       return (FALSE);
+}