[libvirt] [PATCH v1 1/4] cpu_conf: xml to cpu definition parse helper

[Collin Walling]

Implement an XML to virCPUDefPtr helper that handles
the ctxt prerequisite for virCPUDefParseXML.

This does not alter any functionality.

Signed-off-by: Collin Walling <walling at linux.ibm.com>
Reviewed-by: Bjoern Walk <bwalk at linux.ibm.com>
---
 src/conf/cpu_conf.c      | 30 ++++++++++++++++++++++++++++++
 src/conf/cpu_conf.h      |  6 ++++++
 src/cpu/cpu.c            | 14 +-------------
 src/libvirt_private.syms |  1 +
 4 files changed, 38 insertions(+), 13 deletions(-)

diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c
index 33c8b99e49..cf19edcded 100644
--- a/src/conf/cpu_conf.c
+++ b/src/conf/cpu_conf.c
@@ -260,6 +260,36 @@ virCPUDefCopy(const virCPUDef *cpu)
 }
 
 
+int
+virCPUDefParseXMLHelper(const char *xml,
+                        const char *xpath,
+                        virCPUType type,
+                        virCPUDefPtr *cpu)
+{
+    xmlDocPtr doc = NULL;
+    xmlXPathContextPtr ctxt = NULL;
+    int ret = -1;
+
+    if (!xml) {
+        virReportError(VIR_ERR_INVALID_ARG, "%s", _("missing CPU definition"));
+        goto cleanup;
+    }
+
+    if (!(doc = virXMLParseStringCtxt(xml, _("(CPU_definition)"), &ctxt)))
+        goto cleanup;
+
+    if (virCPUDefParseXML(ctxt, xpath, type, cpu) < 0)
+        goto cleanup;
+
+    ret = 0;
+
+ cleanup:
+    xmlFreeDoc(doc);
+    xmlXPathFreeContext(ctxt);
+    return ret;
+}
+
+
 /*
  * Parses CPU definition XML from a node pointed to by @xpath. If @xpath is
  * NULL, the current node of @ctxt is used (i.e., it is a shortcut to ".").
diff --git a/src/conf/cpu_conf.h b/src/conf/cpu_conf.h
index c98db65693..8d06b6f79d 100644
--- a/src/conf/cpu_conf.h
+++ b/src/conf/cpu_conf.h
@@ -181,6 +181,12 @@ virCPUDefCopy(const virCPUDef *cpu);
 virCPUDefPtr
 virCPUDefCopyWithoutModel(const virCPUDef *cpu);
 
+int
+virCPUDefParseXMLHelper(const char *xml,
+                        const char *xpath,
+                        virCPUType type,
+                        virCPUDefPtr *cpu);
+
 int
 virCPUDefParseXML(xmlXPathContextPtr ctxt,
                   const char *xpath,
diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index a223ff06e8..6eca956038 100644
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -111,31 +111,19 @@ virCPUCompareXML(virArch arch,
                  const char *xml,
                  bool failIncompatible)
 {
-    xmlDocPtr doc = NULL;
-    xmlXPathContextPtr ctxt = NULL;
     virCPUDefPtr cpu = NULL;
     virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;
 
     VIR_DEBUG("arch=%s, host=%p, xml=%s",
               virArchToString(arch), host, NULLSTR(xml));
 
-    if (!xml) {
-        virReportError(VIR_ERR_INVALID_ARG, "%s", _("missing CPU definition"));
-        goto cleanup;
-    }
-
-    if (!(doc = virXMLParseStringCtxt(xml, _("(CPU_definition)"), &ctxt)))
-        goto cleanup;
-
-    if (virCPUDefParseXML(ctxt, NULL, VIR_CPU_TYPE_AUTO, &cpu) < 0)
+    if (virCPUDefParseXMLHelper(xml, NULL, VIR_CPU_TYPE_AUTO, &cpu) < 0)
         goto cleanup;
 
     ret = virCPUCompare(arch, host, cpu, failIncompatible);
 
  cleanup:
     virCPUDefFree(cpu);
-    xmlXPathFreeContext(ctxt);
-    xmlFreeDoc(doc);
 
     return ret;
 }
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 94c823d39d..00904d87d7 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -88,6 +88,7 @@ virCPUDefIsEqual;
 virCPUDefListFree;
 virCPUDefListParse;
 virCPUDefParseXML;
+virCPUDefParseXMLHelper;
 virCPUDefStealModel;
 virCPUDefUpdateFeature;
 virCPUModeTypeToString;
-- 
2.20.1