[libvirt] [PATCH] avoid XML attributes escaping problems

[Daniel Veillard]

  The associated patch solves
  https://bugzilla.redhat.com/show_bug.cgi?id=499791
where ' or " character in attribute values may lead to non
well-formed XML. This takes the simplest approach to always escape
then to ' and " since this is completely equivalent from
an XML point of view and avoid the trouble.

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel at veillard.com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/
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Index: src/buf.c
===================================================================
RCS file: /data/cvs/libxen/src/buf.c,v
retrieving revision 1.21
diff -u -u -r1.21 buf.c
--- src/buf.c	17 Nov 2008 11:03:25 -0000	1.21
+++ src/buf.c	12 May 2009 15:02:00 -0000
@@ -266,7 +266,7 @@
         return;
 
     len = strlen(str);
-    if (VIR_ALLOC_N(escaped, 5 * len + 1) < 0) {
+    if (VIR_ALLOC_N(escaped, 6 * len + 1) < 0) {
         virBufferNoMemory(buf);
         return;
     }
@@ -290,6 +290,20 @@
             *out++ = 'm';
             *out++ = 'p';
             *out++ = ';';
+        } else if (*cur == '"') {
+            *out++ = '&';
+            *out++ = 'q';
+            *out++ = 'u';
+            *out++ = 'o';
+            *out++ = 't';
+            *out++ = ';';
+        } else if (*cur == '\'') {
+            *out++ = '&';
+            *out++ = 'a';
+            *out++ = 'p';
+            *out++ = 'o';
+            *out++ = 's';
+            *out++ = ';';
         } else if ((*cur >= 0x20) || (*cur == '\n') || (*cur == '\t') ||
                    (*cur == '\r')) {
             /*