1 files changed, 44 insertions, 9 deletions

diff --git a/sunrpc/xdr_mem.c b/sunrpc/xdr_mem.c
index 481a8664b5..8e88e41ea2 100644
--- a/sunrpc/xdr_mem.c
+++ b/sunrpc/xdr_mem.c
@@ -47,13 +47,13 @@ static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
 #include <rpc/rpc.h>
 
 static bool_t xdrmem_getlong (XDR *, long *);
-static bool_t xdrmem_putlong (XDR *, long *);
+static bool_t xdrmem_putlong (XDR *, const long *);
 static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
-static bool_t xdrmem_putbytes (XDR *, caddr_t, u_int);
-static u_int xdrmem_getpos (XDR *);
+static bool_t xdrmem_putbytes (XDR *, const caddr_t, u_int);
+static u_int xdrmem_getpos (const XDR *);
 static bool_t xdrmem_setpos (XDR *, u_int);
 static long *xdrmem_inline (XDR *, int);
-static void xdrmem_destroy (XDR *);
+static void xdrmem_destroy (const XDR *);
 
 static const struct xdr_ops xdrmem_ops =
 {
@@ -74,7 +74,7 @@ static const struct xdr_ops xdrmem_ops =
 void
 xdrmem_create (xdrs, addr, size, op)
      XDR *xdrs;
-     caddr_t addr;
+     const caddr_t addr;
      u_int size;
      enum xdr_op op;
 {
@@ -85,11 +85,21 @@ xdrmem_create (xdrs, addr, size, op)
   xdrs->x_handy = size;
 }
 
+/*
+ * Nothing needs to be done for the memory case.  The argument is clearly
+ * const.
+ */
+
 static void
-xdrmem_destroy (XDR *xdrs)
+xdrmem_destroy (const XDR *xdrs)
 {
 }
 
+/*
+ * Gets the next word from the memory referenced by xdrs and places it
+ * in the long pointed to by lp.  It then increments the private word to
+ * point at the next element.  Neither object pointed to is const
+ */
 static bool_t
 xdrmem_getlong (xdrs, lp)
      XDR *xdrs;
@@ -103,10 +113,15 @@ xdrmem_getlong (xdrs, lp)
   return TRUE;
 }
 
+/*
+ * Puts the long pointed to by lp in the memory referenced by xdrs.  It
+ * then increments the private word to point at the next element.  The
+ * long pointed at is const
+ */
 static bool_t
 xdrmem_putlong (xdrs, lp)
      XDR *xdrs;
-     long *lp;
+     const long *lp;
 {
 
   if ((xdrs->x_handy -= 4) < 0)
@@ -116,6 +131,12 @@ xdrmem_putlong (xdrs, lp)
   return TRUE;
 }
 
+/*
+ * Gets an unaligned number of bytes from the xdrs structure and writes them
+ * to the address passed in addr.  Be very careful when calling this routine
+ * as it could leave the xdrs pointing to an unaligned structure which is not
+ * a good idea.  None of the things pointed to are const.
+ */
 static bool_t
 xdrmem_getbytes (xdrs, addr, len)
      XDR *xdrs;
@@ -130,10 +151,14 @@ xdrmem_getbytes (xdrs, addr, len)
   return TRUE;
 }
 
+/*
+ * The complementary function to the above.  The same warnings apply about
+ * unaligned data.  The source address is const.
+ */
 static bool_t
 xdrmem_putbytes (xdrs, addr, len)
      XDR *xdrs;
-     caddr_t addr;
+     const caddr_t addr;
      u_int len;
 {
 
@@ -144,14 +169,21 @@ xdrmem_putbytes (xdrs, addr, len)
   return TRUE;
 }
 
+/*
+ * Not sure what this one does.  But it clearly doesn't modify the contents
+ * of xdrs.  **FIXME** does this not assume u_int == u_long?
+ */
 static u_int
 xdrmem_getpos (xdrs)
-     XDR *xdrs;
+     const XDR *xdrs;
 {
 
   return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
 }
 
+/*
+ * xdrs modified
+ */
 static bool_t
 xdrmem_setpos (xdrs, pos)
      XDR *xdrs;
@@ -167,6 +199,9 @@ xdrmem_setpos (xdrs, pos)
   return TRUE;
 }
 
+/*
+ * xdrs modified
+ */
 static long *
 xdrmem_inline (xdrs, len)
      XDR *xdrs;