a4a6b5ff63
Now that https://github.com/llvm/llvm-project/pull/166517 has landed and [Writer](https://github.com/llvm/llvm-project/blob/main/libc/src/stdio/printf_core/writer.h#L130) has been refactored to track bytes written as size_t, strftime can be refactored as well to handle size_t return values. Can't think of a proper way to test this without creating a 2GB+ string, but existing tests cover most cases.
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