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The spec is pretty unambiguous here: https://pubs.opengroup.org/onlinepubs/9799919799/functions/c...

> Upon successful completion, crypt() shall return a pointer to the hashed password [...]. Otherwise, it shall return a null pointer and set errno to indicate the error.

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You need to add that the spec _also_ only defines a singular error state, that isn't applicable here.

> The crypt() function shall fail if:

> [ENOSYS]

> The functionality is not supported on this implementation.

I don't think those error sections are generally meant to be exhaustive?

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