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The NASA secure coding standards are overbearing, obnoxious, over-engineered, and a huge waste of effort.
But they are absolutely correct and the best guidelines I’m aware of.
https://standards.nasa.gov/standard/NASA/NASA-HDBK-2203
https://standards.nasa.gov/standard/NASA/NASA-STD-871913
https://dev.to/xowap/10-rules-to-code-like-nasa-applied-to-interpreted-languages-40dd
Sorry about that, I’m seeing the same. Here’s the site linked from the Internet Archive
https://web.archive.org/web/20240328153801/https://swehb.nasa.gov/