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Inline functions are, in general, more suitable for this task. (See guideline recommendation PRE00-C. Prefer inline or static functions to function-like macros.) Occasionally, however, they are not feasible (when macros are expected to operate on variables of different types, for example).
When multiple statements are used in a macro, they should be bound together in a do-while loop syntactically, so the macro can appear safely inside if clauses or other places that expect a single statement or a statement block. (Alternatively, when an if, for or while statement uses braces even for a single body statement, then multiple statements in a macro will expand correctly even without a do-while loop. See guideline recommendation EXP19-C. Use braces for the body of an if, for, or while statement.
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Related Guidelines
CERT C++ Secure Coding Standard: PRE10-CPP. Wrap multi-statement macros in a do-while loop
Bibliography
unmigrated-wiki-markup
\[[ISO/IEC PDTR 24772|AA. Bibliography#ISO/IEC PDTR 24772]\] TR 24772 "NMP Pre-processor Directions" [
Bibliography
Linux Kernel Newbies FAQ|http://kernelnewbies.org/FAQ] [FAQ/DoWhile0|http://kernelnewbies.org/FAQ/DoWhile0]
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