virxml: Add virXMLPropULongLong

Convenience function to return the value of an unsigned long long XML
attribute.

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/libvirt_private.syms

@@ -3555,6 +3555,7 @@ virXMLPropStringLimit;
 virXMLPropTristateBool;
 virXMLPropTristateSwitch;
 virXMLPropUInt;
+virXMLPropULongLong;
 virXMLSaveFile;
 virXMLValidateAgainstSchema;
 virXMLValidatorFree;

src/util/virxml.c

@@ -755,6 +755,62 @@ virXMLPropUInt(xmlNodePtr node,
 }
 
 
+/**
+ * virXMLPropULongLong:
+ * @node: XML dom node pointer
+ * @name: Name of the property (attribute) to get
+ * @base: Number base, see strtol
+ * @flags: Bitwise or of virXMLPropFlags
+ * @result: The returned value
+ *
+ * Convenience function to return value of an unsigned long long attribute.
+ *
+ * Returns 1 in case of success in which case @result is set,
+ *         or 0 if the attribute is not present,
+ *         or -1 and reports an error on failure.
+ */
+int
+virXMLPropULongLong(xmlNodePtr node,
+                    const char* name,
+                    int base,
+                    virXMLPropFlags flags,
+                    unsigned long long *result)
+{
+    g_autofree char *tmp = NULL;
+    int ret;
+    unsigned long long val;
+
+    if (!(tmp = virXMLPropString(node, name))) {
+        if (!(flags & VIR_XML_PROP_REQUIRED))
+            return 0;
+
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("Missing required attribute '%s' in element '%s'"),
+                       name, node->name);
+        return -1;
+    }
+
+    ret = virStrToLong_ullp(tmp, NULL, base, &val);
+
+    if (ret < 0) {
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("Invalid value for attribute '%s' in element '%s': '%s'. Expected integer value"),
+                       name, node->name, tmp);
+        return -1;
+    }
+
+    if ((flags & VIR_XML_PROP_NONZERO) && (val == 0)) {
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("Invalid value for attribute '%s' in element '%s': Zero is not permitted"),
+                       name, node->name);
+        return -1;
+    }
+
+    *result = val;
+    return 1;
+}
+
+
 /**
  * virXMLPropEnum:
  * @node: XML dom node pointer

src/util/virxml.h

@@ -134,6 +134,14 @@ virXMLPropUInt(xmlNodePtr node,
                unsigned int *result)
     ATTRIBUTE_NONNULL(0) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(4);
 
+int
+virXMLPropULongLong(xmlNodePtr node,
+                    const char* name,
+                    int base,
+                    virXMLPropFlags flags,
+                    unsigned long long *result)
+    ATTRIBUTE_NONNULL(0) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(4);
+
 int
 virXMLPropEnum(xmlNodePtr node,
                const char* name,