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| CERT C Secure Coding Standard | STR34-C. Cast characters to unsigned char before converting to larger integer sizes |
| SEI CERT C++ Coding Standard | VOID STR37-CPP. Arguments to character handling functions must be representable as an unsigned char |
| ISO/IEC TS 17961 | Passing arguments to character-handling functions that are not representable as unsigned char [chrsgnext] |
| MITRE CWE | CWE-704, Incorrect Type Conversion or Cast CWE-686, Function Call with Incorrect Argument Type |
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