SEI CERT C Coding Standard

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A preprocessing directive of the form:

Code Block

# define identifier replacement-list new-line

Wiki Markup
This content has been moved to \[[PRE02-A. Macro replacement lists should be parenthesizeddefines an object-like macro that causes each subsequent instance of the macro name to be replaced by the replacement list of preprocessing tokens that constitute the remainder of the directive \[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\].

Compliant Solution

Code Block
bgColor#ccccff
#define JOIN(x, y) JOIN_AGAIN(x, y)
#define JOIN_AGAIN(x, y) x ## y

JOIN(x, y) calls JOIN_AGAIN(x, y) so that, if x or y is a macro, they aree expanded before the ## operator pastes them together.

Risk Assessment

Recommendation

Severity

Likelihood

Remediation Cost

Priority

Level

DCL03-A

1 (low)

1 (unlikely)

1 (high)

P1

L3

Related Vulnerabilities

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

References

Wiki Markup
\[Saks 08] Dan Saks, Stephen C. Dewhurst. Presentation. Sooner Rather Than Later: Static Programming Techniques for C++.
\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.10.3, "Macro replacement," Section 6.10.3.3, "The ## operator," and Section 6.10.3.4, "Rescanning and further replacement"

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