conf: Introduce virDomainNetFindByName

Small wrapper to lookup interface in domain definition by its
name.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>

src/conf/domain_conf.c

@@ -27004,17 +27004,37 @@ virDomainNetFind(virDomainDefPtr def, const char *device)
             }
         }
     } else { /* ifname */
-        for (i = 0; i < def->nnets; i++) {
-            if (STREQ_NULLABLE(device, def->nets[i]->ifname)) {
-                net = def->nets[i];
-                break;
-            }
-        }
+        net = virDomainNetFindByName(def, device);
     }
 
     return net;
 }
 
+
+/**
+ * virDomainNetFindByName:
+ * @def: domain's def
+ * @ifname: interface name
+ *
+ * Finds a domain's net def given the interface name.
+ *
+ * Returns a pointer to the net def or NULL if not found.
+ */
+virDomainNetDefPtr
+virDomainNetFindByName(virDomainDefPtr def,
+                       const char *ifname)
+{
+    size_t i;
+
+    for (i = 0; i < def->nnets; i++) {
+        if (STREQ_NULLABLE(ifname, def->nets[i]->ifname))
+            return def->nets[i];
+    }
+
+    return NULL;
+}
+
+
 /**
  * virDomainDeviceDefCopy:
  * @caps: Capabilities

src/conf/domain_conf.h

@@ -3001,6 +3001,7 @@ int virDomainDiskSourceParse(xmlNodePtr node,
 
 int virDomainNetFindIdx(virDomainDefPtr def, virDomainNetDefPtr net);
 virDomainNetDefPtr virDomainNetFind(virDomainDefPtr def, const char *device);
+virDomainNetDefPtr virDomainNetFindByName(virDomainDefPtr def, const char *ifname);
 bool virDomainHasNet(virDomainDefPtr def, virDomainNetDefPtr net);
 int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net);
 virDomainNetDefPtr virDomainNetRemove(virDomainDefPtr def, size_t i);

src/libvirt_private.syms

@@ -422,6 +422,7 @@ virDomainNetDefClear;
 virDomainNetDefFormat;
 virDomainNetDefFree;
 virDomainNetFind;
+virDomainNetFindByName;
 virDomainNetFindIdx;
 virDomainNetGenerateMAC;
 virDomainNetGetActualBandwidth;