Cleanup: Add files for version independent versioning helpers

Adds `source/blender/blendloader/intern/versioning_common.cc` and
`versioning_common.h` for version independent versioning functions.

I only placed `do_versions_add_region_if_not_found()` in there for now.
`blo_do_version_old_trackto_to_constraints()` could also be added, but
that's so old, I prefer keeping that in `versioning_legacy.c`.

1 files changed, 50 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_common.cc b/source/blender/blenloader/intern/versioning_common.cc
new file mode 100644
index 00000000000..da3ff08a7dd
--- /dev/null
+++ b/source/blender/blenloader/intern/versioning_common.cc
@@ -0,0 +1,50 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/** \file
+ * \ingroup blenloader
+ */
+/* allow readfile to use deprecated functionality */
+#define DNA_DEPRECATED_ALLOW
+
+#include "DNA_screen_types.h"
+
+#include "BLI_listbase.h"
+
+#include "MEM_guardedalloc.h"
+
+#include "versioning_common.h"
+
+ARegion *do_versions_add_region_if_not_found(ListBase *regionbase,
+                                             int region_type,
+                                             const char *name,
+                                             int link_after_region_type)
+{
+  ARegion *link_after_region = NULL;
+  LISTBASE_FOREACH (ARegion *, region, regionbase) {
+    if (region->regiontype == region_type) {
+      return NULL;
+    }
+    if (region->regiontype == link_after_region_type) {
+      link_after_region = region;
+    }
+  }
+
+  ARegion *new_region = static_cast<ARegion *>(MEM_callocN(sizeof(ARegion), name));
+  new_region->regiontype = region_type;
+  BLI_insertlinkafter(regionbase, link_after_region, new_region);
+  return new_region;
+}