SEI CERT C Coding Standard

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Comment: Updated references from C11->C23

According to the C Standard, 7.4.1 paragraph 1 [ISO/IEC 9899:20112024],

The header <ctype.h> declares several functions useful for classifying and mapping characters. In all cases the argument is an int, the value of which shall be representable as an unsigned char or shall equal the value of the macro EOF. If the argument has any other value, the behavior is undefined.

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Bibliography

[ISO/IEC 9899:20112024]7.4.1, "Character Handling <ctype.h>"
[Kettlewell 2002]Section 1.1, "<ctype.h> and Characters Types"

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