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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() or localeconv()
- 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().
- Do not cast a
void expression to another type.
- Ensure expressions are compatible with the return types of the functions they call.
- Source files should always have a trailing newline.
- Constant expressions must consist entirely of constant components.
- Do not access anything through an address constant.
- Do not declare a function with a type qualifier
- Do not declare an integer constant macro with a non-integer value, or one out of limits
- Do not use inconsistent comparison functions
- Do not use
bsearch() on an array not in the proper order
- In a header name, do not have the characters ', \, ", //, or /* in between the < and > or the characters ', \, //, or /* in between the quotes.
- Do not compare pointers that point to different objects.
- Do not have operations with side effects within an initialization list.
