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STR09-C-EX1: Consecutive values for characters like a~z can be assumed on platforms where ASCII or Unicode is used. This recommendation is primarily concerned with platform portability, for example, if code is migrated from ASCII systems to non-ASCII systems.
Risk Assessment
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
STR09-C | Low | Unlikely | Low | P3 | L3 |
Automated Detection
Tool | Version | Checker | Description | ||||||
| Astrée |
| Supported indirectly via MISRA C:2012 rule 10.1. | |||||||
| Axivion Bauhaus Suite |
| CertC-STR09 | |||||||
| Helix QAC |
| C2106, C2107 | |||||||
| LDRA tool suite |
| 329 S | Fully implemented | ||||||
| Parasoft C/C++test |
2106
2107
| CERT_C-STR09-a | Expressions with type (plain) char and wchar_t shall not be used as operands to built-in operators other than =, ==, != and the unary & operator | |||||||
| PC-lint Plus |
| 9209 | Fully supported | ||||||
| RuleChecker |
| Supported indirectly via MISRA C:2012 rule 10.1. |
Related Guidelines
| SEI CERT C++ Coding Standard | VOID STR07-CPP. Don't assume numeric values for expressions with type plain character |
Bibliography
| [Jones 2009] | Section 5.2.1, "Character Sets" |
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