[libvirt] [PATCH 3/5] Add virXPathULongLong()

[Mark McLoughlin <markmc@xxxxxxxxxx>]

Add a variant of virXPathULong() which can handle long longs.

Needed for parsing storage device capacities.

Signed-off-by: Mark McLoughlin <markmc@xxxxxxxxxx>
---
 src/xml.c |   55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/xml.h |    4 ++++
 2 files changed, 59 insertions(+), 0 deletions(-)

diff --git a/src/xml.c b/src/xml.c
index edfdc17..a4465b2 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -290,6 +290,61 @@ virXPathULongHex(virConnectPtr conn,
     return virXPathULongBase(conn, xpath, ctxt, 16, value);
 }
 
+/**
+ * virXPathULongLong:
+ * @xpath: the XPath string to evaluate
+ * @ctxt: an XPath context
+ * @value: the returned long long value
+ *
+ * Convenience function to evaluate an XPath number
+ *
+ * Returns 0 in case of success in which case @value is set,
+ *         or -1 if the XPath evaluation failed or -2 if the
+ *         value doesn't have a long format.
+ */
+int
+virXPathULongLong(virConnectPtr conn,
+                  const char *xpath,
+                  xmlXPathContextPtr ctxt,
+                  unsigned long long *value)
+{
+    xmlXPathObjectPtr obj;
+    xmlNodePtr relnode;
+    int ret = 0;
+
+    if ((ctxt == NULL) || (xpath == NULL) || (value == NULL)) {
+        virXMLError(conn, VIR_ERR_INTERNAL_ERROR,
+                    "%s", _("Invalid parameter to virXPathULong()"));
+        return (-1);
+    }
+    relnode = ctxt->node;
+    obj = xmlXPathEval(BAD_CAST xpath, ctxt);
+    if ((obj != NULL) && (obj->type == XPATH_STRING) &&
+        (obj->stringval != NULL) && (obj->stringval[0] != 0)) {
+        char *conv = NULL;
+        unsigned long long val;
+
+        val = strtoull((const char *) obj->stringval, &conv, 10);
+        if (conv == (const char *) obj->stringval) {
+            ret = -2;
+        } else {
+            *value = val;
+        }
+    } else if ((obj != NULL) && (obj->type == XPATH_NUMBER) &&
+               (!(isnan(obj->floatval)))) {
+        *value = (unsigned long long) obj->floatval;
+        if (*value != obj->floatval) {
+            ret = -2;
+        }
+    } else {
+        ret = -1;
+    }
+
+    xmlXPathFreeObject(obj);
+    ctxt->node = relnode;
+    return (ret);
+}
+
 char *
 virXMLPropString(xmlNodePtr node,
                  const char *name)
diff --git a/src/xml.h b/src/xml.h
index 3754af2..34b0f10 100644
--- a/src/xml.h
+++ b/src/xml.h
@@ -29,6 +29,10 @@ int		virXPathULong	(virConnectPtr conn,
                                  const char *xpath,
                                  xmlXPathContextPtr ctxt,
                                  unsigned long *value);
+int	        virXPathULongLong(virConnectPtr conn,
+                                 const char *xpath,
+                                 xmlXPathContextPtr ctxt,
+                                 unsigned long long *value);
 int		virXPathLongHex	(virConnectPtr conn,
                                  const char *xpath,
                                  xmlXPathContextPtr ctxt,
-- 
1.6.0.6

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