SEI CERT C Coding Standard

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changes.mady.by.user Shaun Hedrick

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changes.mady.by.user Justin Pincar

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  • Do not use identifiers that are already declared
    • e.g., don't name a variable errno
  • Do not pass functions invalid values
  • For floating point exception functions, only pass 0 or bitwise OR of floating point macros
  • Do not modify the string returned by setlocale()
  • Do not call setjmp() in stupid places (eg. header files)
  • Do not call longjmp() before calling setjmp()
  • Do not call va_start() with a parameter declared with the register storage class, of array type, or a type that isn't compatible with the type after default argument promotions
  • Do not try to get the address constant of a bit-field
    • e.g., do not: &(t.member-designator)
  • When functions fail, data structures often have indeterminate contents
    • e.g., wcsxfrm(), wcsftime(), mbrtowc(), wcrtomb(), strxfrm(), strftime()
  • Do not mismatch multibyte conversion states with character sequences in another state
  • Do not change the LC_CTYPE in between calls to character conversion functions
  • Only pass functions the type they ask for
    • We might already have a rule for this, but I couldn't find it
  • If the result of a function cannot be represented, the behavior is undefined
    • e.g., abs(), labs(), llabs(), div(), ldiv(), lldiv().