There are three distinct char character types, : (plain) char, signed char, and unsigned char. Use plain char for character data.
The signedness of the plain char type is implementation-defined and should not be relied upon.
The only permissible operators on plain char types are assignment and equality operators (=, ==, != ).
Non-Compliant Code Example
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unsigned char msg[100]; |
Compliant Solution
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char error_msg[100]; |
Risk Assessment
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
STR07-A | 1 (low) | 1 (unlikely) | 2 (medium) | P2 | L3 |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
References
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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 5.2.4.1, "Translation limits" \[[MISRA 04|AA. C References#MISRA 04]\] Rule 6.1, "The plain char type shall be used only for the storage and use of character values." |