WM: return the string length from operator name conversion

- In some cases it avoids using strlen on the result.
- Use ATTR_NONNULL for all arguments.
- Remove NULL pointer check for WM_operator_bl_idname src argument.
- Rename from/to to src/dst.

1 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/windowmanager/WM_api.h b/source/blender/windowmanager/WM_api.h
index 268382ec923..59d40ce840f 100644
--- a/source/blender/windowmanager/WM_api.h
+++ b/source/blender/windowmanager/WM_api.h
@@ -895,12 +895,14 @@ char *WM_prop_pystring_assign(struct bContext *C,
                               int index);
 /**
  * Convert: `some.op` -> `SOME_OT_op` or leave as-is.
+ * \return the length of `dst`.
  */
-void WM_operator_bl_idname(char *to, const char *from);
+size_t WM_operator_bl_idname(char *dst, const char *src) ATTR_NONNULL(1, 2);
 /**
  * Convert: `SOME_OT_op` -> `some.op` or leave as-is.
+ * \return the length of `dst`.
  */
-void WM_operator_py_idname(char *to, const char *from);
+size_t WM_operator_py_idname(char *dst, const char *src) ATTR_NONNULL(1, 2);
 /**
  * Sanity check to ensure #WM_operator_bl_idname won't fail.
  * \returns true when there are no problems with \a idname, otherwise report an error.