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Flexible array members are a special type of array where the last element of a structure with more than one named member has an incomplete array type; that is, the size of the array is not specified explicitly within the structure. This "struct hack" was widely used in practice and supported by a variety of compilers. Consequently, a variety of different syntaxes have been used for declaring flexible array members. For C99-compliant implementations, use the syntax guaranteed valid by C99 \[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\]. |
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- The incomplete array type must be the last element within the structure.
- There cannot be an array of structures that contain flexible array members.
- Structures that contain a flexible array member cannot be used as a member in the middle of another structure.
Guideline Rule MEM33-C. Allocate and copy structures containing flexible array members dynamically describes how to allocate and copy structures containing flexible array members.
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
Bibliography
Related Guidelines
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Bibliography
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\[[McCluskey 2001|AA. Bibliography#McCluskey 01]\] ;login:, July 2001, Volume 26, Number 4 |
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