According to C11the C Standard, Section 7.4 [ISO/IEC 9899:2011],
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Note: XSI denotes an X/Open System Interfaces Extension to ISO/IEC 9945—POSIX®. The functions are not defined by the C standardStandard.
STR34-C. Cast characters to unsigned char before converting to larger integer sizes is a generalization of this rule.
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Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
Compass/ROSE | Could detect violations of this rule by seeing if the argument to a character-handling function (listed above) is not an | ||||||||
| charplan | Fully implemented. | |||||||
| PRQA QA-C |
| special case of STR34 | Fully implemented. |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Related Guidelines
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| STR37-CPP. Arguments to character handling functions must be representable as an unsigned char | |
| ISO/IEC |
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| TR 17961 | (Draft) Passing arguments to character-handling functions that are not representable as unsigned char [chrsgnext] |
| MITRE CWE |
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| Incorrect type conversion or cast |
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| -686, |
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| Function call with incorrect argument type |
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Bibliography
| [ISO/IEC 9899:2011] | Section 7.4, "Character Handling <ctype.h>" |
| [Kettlewell 2002] | Section 1.1, "<ctype.h> and |
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| Characters Types" |
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