CodeQL library for C/C++
codeql/cpp-all 2.0.2 (changelog, source)
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Member predicate StrcatFunction::hasArrayWithUnknownSize

Holds if parameter bufParam points to a buffer with no fixed size and no size parameter, which is not null-terminated or which is null-terminated but for which the null value may be written past. For example, the first parameters of sprintf and strcat.

predicate hasArrayWithUnknownSize(int param)