[libvirt] [PATCH 2/3] conf: Rework virDomainDeviceDefParse

[Michal Privoznik]

When adding a new domain device, it is fairly easy to forget to add
corresponding piece into virDomainDeviceDefParse. However, if the
internal structure is changed to one bit switch() the compiler will warn
about not handled enum item.
---
 src/conf/domain_conf.c | 96 ++++++++++++++++++++++++++++----------------------
 1 file changed, 54 insertions(+), 42 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index d0c87b2..764ca6e 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -9336,94 +9336,106 @@ virDomainDeviceDefParse(const char *xmlStr,
     if (VIR_ALLOC(dev) < 0)
         goto error;
 
-    if (xmlStrEqual(node->name, BAD_CAST "disk")) {
-        dev->type = VIR_DOMAIN_DEVICE_DISK;
+    if ((dev->type = virDomainDeviceTypeFromString((const char *) node->name)) < 0) {
+        /* Some crazy mapping of serial, parallel, console and channel to
+         * VIR_DOMAIN_DEVICE_CHR. */
+        if (xmlStrEqual(node->name, BAD_CAST "channel") ||
+            xmlStrEqual(node->name, BAD_CAST "console") ||
+            xmlStrEqual(node->name, BAD_CAST "parallel") ||
+            xmlStrEqual(node->name, BAD_CAST "serial")) {
+            dev->type = VIR_DOMAIN_DEVICE_CHR;
+        } else {
+            virReportError(VIR_ERR_XML_ERROR, _("unknown device type '%s'"), node->name);
+            goto error;
+        }
+    }
+
+    switch ((virDomainDeviceType) dev->type) {
+    case VIR_DOMAIN_DEVICE_DISK:
         if (!(dev->data.disk = virDomainDiskDefParseXML(xmlopt, node, ctxt,
                                                         NULL, def->seclabels,
                                                         def->nseclabels,
                                                         flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "lease")) {
-        dev->type = VIR_DOMAIN_DEVICE_LEASE;
+        break;
+    case VIR_DOMAIN_DEVICE_LEASE:
         if (!(dev->data.lease = virDomainLeaseDefParseXML(node)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "filesystem")) {
-        dev->type = VIR_DOMAIN_DEVICE_FS;
+        break;
+    case VIR_DOMAIN_DEVICE_FS:
         if (!(dev->data.fs = virDomainFSDefParseXML(node, ctxt, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "interface")) {
-        dev->type = VIR_DOMAIN_DEVICE_NET;
+        break;
+    case VIR_DOMAIN_DEVICE_NET:
         if (!(dev->data.net = virDomainNetDefParseXML(xmlopt, node, ctxt,
                                                       NULL, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "input")) {
-        dev->type = VIR_DOMAIN_DEVICE_INPUT;
+        break;
+    case VIR_DOMAIN_DEVICE_INPUT:
         if (!(dev->data.input = virDomainInputDefParseXML(def->os.type,
                                                           node, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "sound")) {
-        dev->type = VIR_DOMAIN_DEVICE_SOUND;
+        break;
+    case VIR_DOMAIN_DEVICE_SOUND:
         if (!(dev->data.sound = virDomainSoundDefParseXML(node, ctxt, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "watchdog")) {
-        dev->type = VIR_DOMAIN_DEVICE_WATCHDOG;
+        break;
+    case VIR_DOMAIN_DEVICE_WATCHDOG:
         if (!(dev->data.watchdog = virDomainWatchdogDefParseXML(node, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "video")) {
-        dev->type = VIR_DOMAIN_DEVICE_VIDEO;
+        break;
+    case VIR_DOMAIN_DEVICE_VIDEO:
         if (!(dev->data.video = virDomainVideoDefParseXML(node, def, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "hostdev")) {
-        dev->type = VIR_DOMAIN_DEVICE_HOSTDEV;
+        break;
+    case VIR_DOMAIN_DEVICE_HOSTDEV:
         if (!(dev->data.hostdev = virDomainHostdevDefParseXML(xmlopt, def, node,
                                                               ctxt, NULL, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "controller")) {
-        dev->type = VIR_DOMAIN_DEVICE_CONTROLLER;
+        break;
+    case VIR_DOMAIN_DEVICE_CONTROLLER:
         if (!(dev->data.controller = virDomainControllerDefParseXML(node, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "graphics")) {
-        dev->type = VIR_DOMAIN_DEVICE_GRAPHICS;
+        break;
+    case VIR_DOMAIN_DEVICE_GRAPHICS:
         if (!(dev->data.graphics = virDomainGraphicsDefParseXML(node, ctxt, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "hub")) {
-        dev->type = VIR_DOMAIN_DEVICE_HUB;
+        break;
+    case VIR_DOMAIN_DEVICE_HUB:
         if (!(dev->data.hub = virDomainHubDefParseXML(node, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "redirdev")) {
-        dev->type = VIR_DOMAIN_DEVICE_REDIRDEV;
+        break;
+    case VIR_DOMAIN_DEVICE_REDIRDEV:
         if (!(dev->data.redirdev = virDomainRedirdevDefParseXML(node, NULL, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "rng")) {
-        dev->type = VIR_DOMAIN_DEVICE_RNG;
+        break;
+    case VIR_DOMAIN_DEVICE_RNG:
         if (!(dev->data.rng = virDomainRNGDefParseXML(node, ctxt, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "channel") ||
-               xmlStrEqual(node->name, BAD_CAST "console") ||
-               xmlStrEqual(node->name, BAD_CAST "parallel") ||
-               xmlStrEqual(node->name, BAD_CAST "serial")) {
-        dev->type = VIR_DOMAIN_DEVICE_CHR;
+        break;
+    case VIR_DOMAIN_DEVICE_CHR:
         if (!(dev->data.chr = virDomainChrDefParseXML(ctxt,
                                                       node,
                                                       def->seclabels,
                                                       def->nseclabels,
                                                       flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "smartcard")) {
-        dev->type = VIR_DOMAIN_DEVICE_SMARTCARD;
+        break;
+    case VIR_DOMAIN_DEVICE_SMARTCARD:
         if (!(dev->data.smartcard = virDomainSmartcardDefParseXML(node, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "memballoon")) {
-        dev->type = VIR_DOMAIN_DEVICE_MEMBALLOON;
+        break;
+    case VIR_DOMAIN_DEVICE_MEMBALLOON:
         if (!(dev->data.memballoon = virDomainMemballoonDefParseXML(node, flags)))
             goto error;
-    } else if (xmlStrEqual(node->name, BAD_CAST "nvram")) {
-        dev->type = VIR_DOMAIN_DEVICE_NVRAM;
+        break;
+    case VIR_DOMAIN_DEVICE_NVRAM:
         if (!(dev->data.nvram = virDomainNVRAMDefParseXML(node, flags)))
             goto error;
-    } else {
-        virReportError(VIR_ERR_XML_ERROR, "%s", _("unknown device type"));
-        goto error;
+        break;
+    case VIR_DOMAIN_DEVICE_NONE:
+    case VIR_DOMAIN_DEVICE_LAST:
+        break;
     }
 
     /* callback to fill driver specific device aspects */
-- 
1.8.1.5