"char" vs. "signed char" vs. "unsigned char" in rule 10.5

[jbezem]

1. MISRA requires that you define your own types like "uint8_t", using built-in types without typedef is discouraged/forbidden. (Rule 6.3)
2. Type 'char' (plain) shall only be used for character values, the only allowed operations are assignment and (in)equality. (Rule 6.1)

Your case is in violation of Rule 6.1, so 10.5 is not the only violation. Rule 10.5 has not been designed for situations covering "plain char" underlying types.

HTH,

Johan