SEI CERT C Coding Standard

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changes.mady.by.user Melanie Thompson

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Wiki Markup
In this noncompliant code example \[[GCC Bugs|http://gcc.gnu.org/bugs.html#nonbugs_c]\], the author uses preprocessor directives to specify platform-specific arguments to {{memcpy()}}. However, if {{memcpy()}} is implemented using a macro, the code results in undefined behavior.

Code Block
bgColor#FFCCCC
langc
memcpy(dest, src,
#ifdef PLATFORM1
  12
#else
  24
#endif
);

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Wiki Markup
In this compliant solution \[[GCC Bugs|http://gcc.gnu.org/bugs.html#nonbugs_c]\], the appropriate call to {{memcpy()}} is determined outside the function call.

Code Block
bgColor#ccccff
langc
#ifdef PLATFORM1
  memcpy(dest, src, 12);
#else
  memcpy(dest, src, 24);
#endif

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