[libvirt PATCH v4 4/8] virxml: Add virXMLPropUInt

[Tim Wiederhake <twiederh@xxxxxxxxxx>]

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

Signed-off-by: Tim Wiederhake <twiederh@xxxxxxxxxx>
---
 src/libvirt_private.syms |  1 +
 src/util/virxml.c        | 55 ++++++++++++++++++++++++++++++++++++++++
 src/util/virxml.h        |  6 +++++
 3 files changed, 62 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index bdb63349ee..dc6c9191c8 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -3549,6 +3549,7 @@ virXMLPropString;
 virXMLPropStringLimit;
 virXMLPropTristateBool;
 virXMLPropTristateSwitch;
+virXMLPropUInt;
 virXMLSaveFile;
 virXMLValidateAgainstSchema;
 virXMLValidatorFree;
diff --git a/src/util/virxml.c b/src/util/virxml.c
index 807cb7dae9..4d8cda3985 100644
--- a/src/util/virxml.c
+++ b/src/util/virxml.c
@@ -707,6 +707,61 @@ virXMLPropInt(xmlNodePtr node, const char *name, int base,
 }
 
 
+/**
+ * virXMLPropUInt:
+ * @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 integer 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
+virXMLPropUInt(xmlNodePtr node, const char* name, int base,
+               virXMLPropFlags flags, unsigned int *result)
+{
+    g_autofree char *tmp = NULL;
+    int ret;
+
+    if (!node || !name || !result) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Invalid argument to %s"),
+                       __FUNCTION__);
+        return -1;
+    }
+
+    if (!(tmp = virXMLPropString(node, name))) {
+        if ((flags & VIR_XML_PROP_REQUIRED) != VIR_XML_PROP_REQUIRED)
+            return 0;
+
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("Missing required attribute '%s' in element '%s'"),
+                       name, node->name);
+        return -1;
+    }
+
+    if (flags & VIR_XML_PROP_WRAPNEGATIVE) {
+        ret = virStrToLong_ui(tmp, NULL, base, result);
+    } else {
+        ret = virStrToLong_uip(tmp, NULL, base, result);
+    }
+
+    if ((ret < 0) || ((flags & VIR_XML_PROP_NONZERO) && (*result == 0))) {
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("Invalid value for attribute '%s' in element '%s': '%s'. Expected integer value"),
+                       name, node->name, tmp);
+        return -1;
+    }
+
+    return 1;
+}
+
+
 /**
  * virXPathBoolean:
  * @xpath: the XPath string to evaluate
diff --git a/src/util/virxml.h b/src/util/virxml.h
index aba863ae11..82d5d16375 100644
--- a/src/util/virxml.h
+++ b/src/util/virxml.h
@@ -37,6 +37,7 @@ typedef enum {
     VIR_XML_PROP_OPTIONAL       = 0,        /* Attribute may be absent */
     VIR_XML_PROP_REQUIRED       = 1 << 0,   /* Attribute may not be absent */
     VIR_XML_PROP_NONZERO        = 1 << 1,   /* Attribute may not be zero */
+    VIR_XML_PROP_WRAPNEGATIVE   = 1 << 2,   /* Wrap around negative values */
 } virXMLPropFlags;
 
 int              virXPathBoolean(const char *xpath,
@@ -97,6 +98,11 @@ int                virXMLPropInt(xmlNodePtr node,
                                  int base,
                                  virXMLPropFlags flags,
                                  int *result);
+int               virXMLPropUInt(xmlNodePtr node,
+                                 const char* name,
+                                 int base,
+                                 virXMLPropFlags flags,
+                                 unsigned int *result);
 
 /* Internal function; prefer the macros below.  */
 xmlDocPtr      virXMLParseHelper(int domcode,
-- 
2.26.2