File sexpr2string.patch of Package libvirt

From 1a1f8b9dbb68bf43c831e471ab4308d81a113ecd Mon Sep 17 00:00:00 2001
From: Jim Fehlig <jfehlig@novell.com>
Date: Tue, 25 Aug 2009 15:54:18 -0600
Subject: [PATCH] Fix sexpr2string() to handle empty list.

S-expression containing empty lists, e.g. (cpus (() () () ())),
was not being handled properly in sexpr2string() serialization.
Emit an empty list when encountering NIL sexpr kind.
---
 src/sexpr.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

Index: libvirt-0.4.6/src/sexpr.c
===================================================================
--- libvirt-0.4.6.orig/src/sexpr.c
+++ libvirt-0.4.6/src/sexpr.c
@@ -270,6 +270,10 @@ sexpr2string(const struct sexpr * sexpr,
             ret += tmp;
             break;
         case SEXPR_NIL:
+            tmp = snprintf(buffer + ret, n_buffer - ret, "()");
+            if (tmp == 0)
+                goto error;
+            ret += tmp;
             break;
         default:
             goto error;