Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!aussie!rex From: rex@aussie.UUCP (Rex Jaeschke) Newsgroups: comp.lang.c Subject: Re: Some Comments & Questions about ANSI C Message-ID: <21.UUL1.3#5077@aussie.UUCP> Date: 13 Jun 89 01:01:12 GMT References: Organization: Journal of C Language Translation Lines: 54 > errno.h - this will contain the #defines for error messages. > But will it contain the declaration "extern int errno" ? Yes. This is the ONLY place errno should be declared. Not in math.h and not in stddef.h (where it lived until errno.h was created.) > locale.h - This will contain "properties that depend on local > language, nationality, or culture". Such as? Prototypes for setlocale and localeconv functions, macro definitions for the LC_* family and the lconv structure template for all the currency info. This struct and the set of LC_* macros can be extended by the implementer. > stddef.h - Definition of the type size_t (A7.4.8). But what > else goes in here? ino_t and dev_t presumably stay > in sys/types.h (8.6 p 181). typedefs: size_t, ptrdiff_t, wchar_t macros: NULL, offsetof That's all. > 2. It seems to me that every time I want to #include , I must > also #include and beforehand. Each and every std header must be self-sufficient and MUST NOT #include any other std header. A common practice is/was to define va_end as ap = NULL. No can do 'cos NULL isn't defined in stdarg.h. > 4. I'm still not entirely sure I understand "void *". If I have a A void pointer is assignment compatible with all "real" pointers and needs no explicit cast in assignment, passing arguments in, or getting values back from functions. > 5. Does the standard say anything about where function definitions for > fopen and opendir must go? Also, is mentioned in the > standard, or is it up to the individual implementor to choose this? fopen is stdio.h; opendir and direct.h non-std. > 6. Finally, I see there's no strdup in ANSI C. Sigh. I guess it's Correct. Rex ---------------------------------------------------------------------------- Rex Jaeschke | C Users Journal | Journal of C Language Translation (703) 860-0091 | DEC PROFESSIONAL |1810 Michael Faraday Drive, Suite 101 uunet!aussie!rex | Programmers Journal | Reston, Virginia 22090, USA ---------------------------------------------------------------------------- Convener of the Numerical C Extensions Group (NCEG) ----------------------------------------------------------------------------