[libvirt] [PATCH 21/24] maint: improve VIR_ERR_INVALID_NWFILTER usage

[Eric Blake]

While all errors related to invalid nwfilters appeared to be
consistent, we might as well continue the trend of using a
common macro.  For now, we don't need virCheckNWFilterGoto().

* src/datatypes.h (virCheckNWFilterReturn): New macro.
(VIR_IS_NWFILTER, VIR_IS_CONNECTED_NWFILTER): Drop unused macros.
* src/libvirt.c: Use macro throughout.
(virLibNWFilterError): Drop unused macro.

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/datatypes.h | 17 +++++++++++++----
 src/libvirt.c   | 50 ++++++++++----------------------------------------
 2 files changed, 23 insertions(+), 44 deletions(-)

diff --git a/src/datatypes.h b/src/datatypes.h
index 6f092a7..7932a6c 100644
--- a/src/datatypes.h
+++ b/src/datatypes.h
@@ -218,10 +218,19 @@ extern virClassPtr virStoragePoolClass;
         }                                                               \
     } while (0)

-# define VIR_IS_NWFILTER(obj) \
-    (virObjectIsClass((obj), virNWFilterClass))
-# define VIR_IS_CONNECTED_NWFILTER(obj) \
-    (VIR_IS_NWFILTER(obj) && virObjectIsClass((obj)->conn, virConnectClass))
+# define virCheckNWFilterReturn(obj, retval)                            \
+    do {                                                                \
+        virNWFilterPtr _nw = (obj);                                     \
+        if (!virObjectIsClass(_nw, virNWFilterClass) ||                 \
+            !virObjectIsClass(_nw->conn, virConnectClass)) {            \
+            virReportErrorHelper(VIR_FROM_NWFILTER,                     \
+                                 VIR_ERR_INVALID_NWFILTER,              \
+                                 __FILE__, __FUNCTION__, __LINE__,      \
+                                 __FUNCTION__);                         \
+            virDispatchError(NULL);                                     \
+            return retval;                                              \
+        }                                                               \
+    } while (0)

 # define VIR_IS_SNAPSHOT(obj) \
     (virObjectIsClass((obj), virDomainSnapshotClass))
diff --git a/src/libvirt.c b/src/libvirt.c
index b460c00..9fb69ed 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -518,9 +518,6 @@ DllMain(HINSTANCE instance ATTRIBUTE_UNUSED,
 #define virLibDomainError(code, ...)                              \
     virReportErrorHelper(VIR_FROM_DOM, code, __FILE__,            \
                          __FUNCTION__, __LINE__, __VA_ARGS__)
-#define virLibNWFilterError(code, ...)                            \
-    virReportErrorHelper(VIR_FROM_NWFILTER, code, __FILE__,       \
-                         __FUNCTION__, __LINE__, __VA_ARGS__)
 #define virLibDomainSnapshotError(code, ...)                       \
     virReportErrorHelper(VIR_FROM_DOMAIN_SNAPSHOT, code, __FILE__, \
                          __FUNCTION__, __LINE__, __VA_ARGS__)
@@ -16721,11 +16718,7 @@ virNWFilterFree(virNWFilterPtr nwfilter)

     virResetLastError();

-    if (!VIR_IS_CONNECTED_NWFILTER(nwfilter)) {
-        virLibNWFilterError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return -1;
-    }
+    virCheckNWFilterReturn(nwfilter, -1);

     virObjectUnref(nwfilter);
     return 0;
@@ -16748,11 +16741,8 @@ virNWFilterGetName(virNWFilterPtr nwfilter)

     virResetLastError();

-    if (!VIR_IS_NWFILTER(nwfilter)) {
-        virLibNWFilterError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return NULL;
-    }
+    virCheckNWFilterReturn(nwfilter, NULL);
+
     return nwfilter->name;
 }

@@ -16773,11 +16763,7 @@ virNWFilterGetUUID(virNWFilterPtr nwfilter, unsigned char *uuid)

     virResetLastError();

-    if (!VIR_IS_NWFILTER(nwfilter)) {
-        virLibNWFilterError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return -1;
-    }
+    virCheckNWFilterReturn(nwfilter, -1);
     virCheckNonNullArgGoto(uuid, error);

     memcpy(uuid, &nwfilter->uuid[0], VIR_UUID_BUFLEN);
@@ -16807,11 +16793,7 @@ virNWFilterGetUUIDString(virNWFilterPtr nwfilter, char *buf)

     virResetLastError();

-    if (!VIR_IS_NWFILTER(nwfilter)) {
-        virLibNWFilterError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return -1;
-    }
+    virCheckNWFilterReturn(nwfilter, -1);
     virCheckNonNullArgGoto(buf, error);

     virUUIDFormat(nwfilter->uuid, buf);
@@ -16878,13 +16860,9 @@ virNWFilterUndefine(virNWFilterPtr nwfilter)

     virResetLastError();

-    if (!VIR_IS_CONNECTED_NWFILTER(nwfilter)) {
-        virLibNWFilterError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return -1;
-    }
-
+    virCheckNWFilterReturn(nwfilter, -1);
     conn = nwfilter->conn;
+
     virCheckReadOnlyGoto(conn->flags, error);

     if (conn->nwfilterDriver && conn->nwfilterDriver->nwfilterUndefine) {
@@ -16922,12 +16900,7 @@ virNWFilterGetXMLDesc(virNWFilterPtr nwfilter, unsigned int flags)

     virResetLastError();

-    if (!VIR_IS_CONNECTED_NWFILTER(nwfilter)) {
-        virLibNWFilterError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return NULL;
-    }
-
+    virCheckNWFilterReturn(nwfilter, NULL);
     conn = nwfilter->conn;

     if (conn->nwfilterDriver && conn->nwfilterDriver->nwfilterGetXMLDesc) {
@@ -16971,11 +16944,8 @@ virNWFilterRef(virNWFilterPtr nwfilter)

     virResetLastError();

-    if ((!VIR_IS_CONNECTED_NWFILTER(nwfilter))) {
-        virLibConnError(VIR_ERR_INVALID_NWFILTER, __FUNCTION__);
-        virDispatchError(NULL);
-        return -1;
-    }
+    virCheckNWFilterReturn(nwfilter, -1);
+
     virObjectRef(nwfilter);
     return 0;
 }
-- 
1.8.4.2