SEI CERT C Coding Standard

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changes.mady.by.user Michal Rozenau

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Comment: Updated references from C11->C23

According to the C Standard, 7.4.1 paragraph 1 [ISO/IEC 9899:20112024],

The header <ctype.h> declares several functions useful for classifying and mapping characters. In all cases the argument is an int, the value of which shall be representable as an unsigned char or shall equal the value of the macro EOF. If the argument has any other value, the behavior is undefined.

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Tool

Version

Checker

Description

Astrée
Include Page
Astrée_V
Astrée_V
ctype-limitsPartially checked
Axivion Bauhaus Suite

Include Page
Axivion Bauhaus Suite_V
Axivion Bauhaus Suite_V

CertC-STR37Fully implementedSupported, but no explicit checker
CodeSonar
Include Page
CodeSonar_V
CodeSonar_V
MISC.NEGCHARNegative character value
Compass/ROSE

Could detect violations of this rule by seeing if the argument to a character handling function (listed above) is not an unsigned char

ECLAIR

Include Page
ECLAIR_V
ECLAIR_V

CC2.STR37

Fully implemented

Helix QAC

Include Page
Helix QAC_V
Helix QAC_V

C4413, C4414

C++3051


Klocwork
Include Page
Klocwork_V
Klocwork_V
AUTOSAR.STDLIB.CCTYPE.UCHAR
MISRA.ETYPE.ASSIGN.2012


LDRA tool suite
Include Page
LDRA_V
LDRA_V
663 SFully implemented
Parasoft C/C++test

Include Page
Parasoft_V
Parasoft_V

CERT_C-STR37-aDo not pass incorrect values to ctype.h library functions
Polyspace Bug Finder

Include Page
Polyspace Bug Finder_V
Polyspace Bug Finder_V

CERT C: Rule STR37-C

Checks for invalid Invalid use of standard library integer routine

Misuse of sign-extended character value

Wrong arguments to standard library function

Data type conversion with sign extension causes unexpected behavior

PRQA QA-C
Include Page
PRQA QA-C_vPRQA QA-C_v4413,4414Fully implemented PRQA QA-C++ 4.2

(rule fully covered)

RuleChecker

Include Page
RuleChecker_V
RuleChecker_V

ctype-limitsPartially checked
TrustInSoft Analyzer

Include Page
TrustInSoft Analyzer_V
TrustInSoft Analyzer_V

valid_charPartially verified.3051 

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

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Bibliography

[ISO/IEC 9899:20112024]7.4.1, "Character Handling <ctype.h>"
[Kettlewell 2002]Section 1.1, "<ctype.h> and Characters Types"

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