[libvirt PATCH 03/38] virxml: Add virXMLPropOnOff

[Tim Wiederhake]

Convenience function to return value of an on / off attribute.

Does not use virTristateSwitchTypeFromString to disallow "default".

Signed-off-by: Tim Wiederhake <twiederh at redhat.com>
---
 src/util/virxml.c | 37 +++++++++++++++++++++++++++++++++++++
 src/util/virxml.h |  3 +++
 2 files changed, 40 insertions(+)

diff --git a/src/util/virxml.c b/src/util/virxml.c
index 47e8414bd5..7c06530d25 100644
--- a/src/util/virxml.c
+++ b/src/util/virxml.c
@@ -593,6 +593,43 @@ virXMLPropYesNo(xmlNodePtr node, const char* name, virTristateBool *value)
 }
 
 
+/**
+ * virXMLPropOnOff:
+ * @node: XML dom node pointer
+ * @name: Name of the property (attribute) to get
+ * @value: The returned virTristateSwitch value
+ *
+ * Convenience function to return value of an on / off attribute.
+ *
+ * Returns 1 in case of success in which case @value is set,
+ *         or 0 if the attribute is not present,
+ *         or -1 and reports an error on failure.
+ */
+int
+virXMLPropOnOff(xmlNodePtr node, const char* name, virTristateSwitch *value)
+{
+    g_autofree char *tmp = virXMLPropString(node, name);
+
+    if (!tmp)
+        return 0;
+
+    if (STREQ("on", tmp)) {
+        *value = VIR_TRISTATE_SWITCH_ON;
+        return 1;
+    }
+
+    if (STREQ("off", tmp)) {
+        *value = VIR_TRISTATE_SWITCH_OFF;
+        return 1;
+    }
+
+    virReportError(VIR_ERR_XML_ERROR,
+                   _("Invalid value for attribute '%s' in node '%s': '%s'. Expected 'on' or 'off'"),
+                   name, node->name, tmp);
+    return -1;
+}
+
+
 /**
  * virXPathBoolean:
  * @xpath: the XPath string to evaluate
diff --git a/src/util/virxml.h b/src/util/virxml.h
index 072948b3e2..d0577723ef 100644
--- a/src/util/virxml.h
+++ b/src/util/virxml.h
@@ -81,6 +81,9 @@ char *   virXMLNodeContentString(xmlNodePtr node);
 int              virXMLPropYesNo(xmlNodePtr node,
                                  const char *name,
                                  virTristateBool *value);
+int              virXMLPropOnOff(xmlNodePtr node,
+                                 const char *name,
+                                 virTristateSwitch *value);
 
 /* Internal function; prefer the macros below.  */
 xmlDocPtr      virXMLParseHelper(int domcode,
-- 
2.26.2