scrrun: Implement AvailableSpace property for a drive.

dlls/scrrun/filesystem.c

@@ -736,11 +736,21 @@ static HRESULT WINAPI drive_get_RootFolder(IDrive *iface, IFolder **folder)
     return E_NOTIMPL;
 }
 
-static HRESULT WINAPI drive_get_AvailableSpace(IDrive *iface, VARIANT *avail)
+static HRESULT WINAPI drive_get_AvailableSpace(IDrive *iface, VARIANT *v)
 {
     struct drive *This = impl_from_IDrive(iface);
-    FIXME("(%p)->(%p): stub\n", This, avail);
-    return E_NOTIMPL;
+    ULARGE_INTEGER avail;
+
+    TRACE("(%p)->(%p)\n", This, v);
+
+    if (!v)
+        return E_POINTER;
+
+    if (!GetDiskFreeSpaceExW(This->root, &avail, NULL, NULL))
+        return E_FAIL;
+
+    V_VT(v) = VT_R8;
+    return VarR8FromUI8(avail.QuadPart, &V_R8(v));
 }
 
 static HRESULT WINAPI drive_get_FreeSpace(IDrive *iface, VARIANT *v)

dlls/scrrun/tests/filesystem.c

@@ -1250,6 +1250,9 @@ static void test_DriveCollection(void)
         hr = IDrive_get_TotalSize(drive, NULL);
         ok(hr == E_POINTER, "got 0x%08x\n", hr);
 
+        hr = IDrive_get_AvailableSpace(drive, NULL);
+        ok(hr == E_POINTER, "got 0x%08x\n", hr);
+
         if (type == Fixed) {
             VARIANT_BOOL ready = VARIANT_FALSE;
             VARIANT size;
@@ -1263,6 +1266,12 @@ static void test_DriveCollection(void)
             ok(hr == S_OK, "got 0x%08x\n", hr);
             ok(V_VT(&size) == VT_R8, "got %d\n", V_VT(&size));
             ok(V_R8(&size) > 0, "got %f\n", V_R8(&size));
+
+            V_VT(&size) = VT_EMPTY;
+            hr = IDrive_get_AvailableSpace(drive, &size);
+            ok(hr == S_OK, "got 0x%08x\n", hr);
+            ok(V_VT(&size) == VT_R8, "got %d\n", V_VT(&size));
+            ok(V_R8(&size) > 0, "got %f\n", V_R8(&size));
         }
         VariantClear(&var);
     }