1 files changed, 131 insertions, 0 deletions
diff --git a/src/pmap_prot2.c b/src/pmap_prot2.c
new file mode 100644
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+++ b/src/pmap_prot2.c
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+/*
+ * Copyright (c) 2009, Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - Neither the name of Sun Microsystems, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * pmap_prot2.c
+ * Protocol for the local binder service, or pmap.
+ *
+ * Copyright (C) 1984, Sun Microsystems, Inc.
+ */
+
+#include <assert.h>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+#include <rpc/pmap_prot.h>
+
+
+/*
+ * What is going on with linked lists? (!)
+ * First recall the link list declaration from pmap_prot.h:
+ *
+ * struct pmaplist {
+ *	struct pmap pml_map;
+ *	struct pmaplist *pml_map;
+ * };
+ *
+ * Compare that declaration with a corresponding xdr declaration that
+ * is (a) pointer-less, and (b) recursive:
+ *
+ * typedef union switch (bool_t) {
+ *
+ *	case TRUE: struct {
+ *		struct pmap;
+ * 		pmaplist_t foo;
+ *	};
+ *
+ *	case FALSE: struct {};
+ * } pmaplist_t;
+ *
+ * Notice that the xdr declaration has no nxt pointer while
+ * the C declaration has no bool_t variable.  The bool_t can be
+ * interpreted as ``more data follows me''; if FALSE then nothing
+ * follows this bool_t; if TRUE then the bool_t is followed by
+ * an actual struct pmap, and then (recursively) by the
+ * xdr union, pamplist_t.
+ *
+ * This could be implemented via the xdr_union primitive, though this
+ * would cause a one recursive call per element in the list.  Rather than do
+ * that we can ``unwind'' the recursion
+ * into a while loop and do the union arms in-place.
+ *
+ * The head of the list is what the C programmer wishes to past around
+ * the net, yet is the data that the pointer points to which is interesting;
+ * this sounds like a job for xdr_reference!
+ */
+bool_t
+xdr_pmaplist(xdrs, rp)
+	XDR *xdrs;
+	struct pmaplist **rp;
+{
+	/*
+	 * more_elements is pre-computed in case the direction is
+	 * XDR_ENCODE or XDR_FREE.  more_elements is overwritten by
+	 * xdr_bool when the direction is XDR_DECODE.
+	 */
+	bool_t more_elements;
+	int freeing;
+	struct pmaplist **next	= NULL; /* pacify gcc */
+
+	assert(xdrs != NULL);
+	assert(rp != NULL);
+
+	freeing = (xdrs->x_op == XDR_FREE);
+
+	for (;;) {
+		more_elements = (bool_t)(*rp != NULL);
+		if (! xdr_bool(xdrs, &more_elements))
+			return (FALSE);
+		if (! more_elements)
+			return (TRUE);  /* we are done */
+		/*
+		 * the unfortunate side effect of non-recursion is that in
+		 * the case of freeing we must remember the next object
+		 * before we free the current object ...
+		 */
+		if (freeing)
+			next = &((*rp)->pml_next); 
+		if (! xdr_reference(xdrs, (caddr_t *)rp,
+		    (u_int)sizeof(struct pmaplist), (xdrproc_t)xdr_pmap))
+			return (FALSE);
+		rp = (freeing) ? next : &((*rp)->pml_next);
+	}
+}
+
+
+/*
+ * xdr_pmaplist_ptr() is specified to take a PMAPLIST *, but is identical in
+ * functionality to xdr_pmaplist().
+ */
+bool_t
+xdr_pmaplist_ptr(xdrs, rp)
+	XDR *xdrs;
+	struct pmaplist *rp;
+{
+	return xdr_pmaplist(xdrs, (struct pmaplist **)(void *)rp);
+}