- Add xdr_sizeof(3) to libc

- Document xdr_sizeof(3); from NetBSD

Discussed with:	kib

4 files changed, 22 insertions, 4 deletions

diff --git a/lib/libc/xdr/Makefile.inc b/lib/libc/xdr/Makefile.inc
index 2d360ac..d1bb208 100644
--- a/lib/libc/xdr/Makefile.inc
+++ b/lib/libc/xdr/Makefile.inc
@@ -3,7 +3,8 @@
 
 .PATH: ${.CURDIR}/xdr ${.CURDIR}/.
 SRCS+=	xdr.c xdr_array.c xdr_float.c xdr_mem.c \
-	xdr_rec.c xdr_reference.c xdr_stdio.c
+	xdr_rec.c xdr_reference.c xdr_sizeof.c \
+	xdr_stdio.c
 
 SYM_MAPS+=	${.CURDIR}/xdr/Symbol.map
 
@@ -39,6 +40,7 @@ MLINKS+=	rpc_xdr.3 xdr_accepted_reply.3 \
 		xdr.3 xdr_reference.3 \
 		xdr.3 xdr_setpos.3 \
 		xdr.3 xdr_short.3 \
+		xdr.3 xdr_sizeof.3 \
 		xdr.3 xdrstdio_create.3 \
 		xdr.3 xdr_string.3 \
 		xdr.3 xdr_u_char.3 \
diff --git a/lib/libc/xdr/Symbol.map b/lib/libc/xdr/Symbol.map
index 0739b7b..a8eb3a1 100644
--- a/lib/libc/xdr/Symbol.map
+++ b/lib/libc/xdr/Symbol.map
@@ -42,7 +42,6 @@ FBSD_1.0 {
 	xdrrec_endofrecord;
 	xdr_reference;
 	xdr_pointer;
-	/* xdr_sizeof; */ /* Why is xdr_sizeof.c not included in Makefileinc? */
 	xdrstdio_create;
 };
 
@@ -51,3 +50,7 @@ FBSD_1.1 {
 	xdr_uint32_t;
 	xdr_uint64_t;
 };
+
+FBSD_1.2 {
+	xdr_sizeof;
+};
diff --git a/lib/libc/xdr/xdr.3 b/lib/libc/xdr/xdr.3
index 19c7e57..8998d06 100644
--- a/lib/libc/xdr/xdr.3
+++ b/lib/libc/xdr/xdr.3
@@ -31,6 +31,7 @@
 .Nm xdr_reference ,
 .Nm xdr_setpos ,
 .Nm xdr_short ,
+.Nm xdr_sizeof,
 .Nm xdrstdio_create ,
 .Nm xdr_string ,
 .Nm xdr_u_char ,
@@ -561,6 +562,18 @@ A filter primitive that translates between C
 integers and their external representations.
 This routine returns one if it succeeds, zero otherwise.
 .Pp
+.It Xo
+.Ft unsigned long
+.Xc
+.It Xo
+.Fn xdr_sizeof "xdrproc_t func" "void *data"
+.Xc
+.Pp
+This routine returns the amount of memory required to encode
+.Fa data
+using filter
+.Fa func .
+.Pp
 .It Li "#ifdef _STDIO_H_"
 .It Li "/* XDR using stdio library */"
 .It Xo
diff --git a/lib/libc/xdr/xdr_sizeof.c b/lib/libc/xdr/xdr_sizeof.c
index 20f1c3a..f33c613 100644
--- a/lib/libc/xdr/xdr_sizeof.c
+++ b/lib/libc/xdr/xdr_sizeof.c
@@ -94,7 +94,7 @@ x_inline(xdrs, len)
 	if (xdrs->x_op != XDR_ENCODE) {
 		return (NULL);
 	}
-	if (len < (u_int)xdrs->x_base) {
+	if (len < (u_int)(uintptr_t)xdrs->x_base) {
 		/* x_private was already allocated */
 		xdrs->x_handy += len;
 		return ((int32_t *) xdrs->x_private);
@@ -106,7 +106,7 @@ x_inline(xdrs, len)
 			xdrs->x_base = 0;
 			return (NULL);
 		}
-		xdrs->x_base = (caddr_t) len;
+		xdrs->x_base = (caddr_t)(uintptr_t)len;
 		xdrs->x_handy += len;
 		return ((int32_t *) xdrs->x_private);
 	}