Potential Memory Leak

In src/constants.c, if the PyNumber_And call fails, the routine returns without disposing of allocated objects.

Enclosed is a patch that fixes this, while regularizing the handling of cleanup on errors in an easier-to-understand, more structured fashion, avoiding gotos. Even with explicitly spelling out PyErr_Occurred() calls everywhere, the code is still slightly shorter.

But I think a C extension library requires too much work for this kind of thing. A more complete binding for Fontconfig can be done in pure Python with much less code.

まず src/constants.c を読み、PyNumber_And の失敗パスと添付パッチを比較します。この失敗時に割り当てられたオブジェクトが破棄されること、およびエラーのクリーンアップパスが一貫して処理されることを確認します。これらのエラーパスでルーチンにリークがなければ完了です。