Add realpath Prototype

[Sebastian Huber]

On 2013-11-20 15:35, Joel Sherrill wrote:
> On 11/20/2013 8:26 AM, Corinna Vinschen wrote:
>> On Nov 20 07:38, Joel Sherrill wrote:
>>> On 11/20/2013 3:46 AM, Corinna Vinschen wrote:
>>>> On Nov 19 12:42, Corinna Vinschen wrote:
>>>>> On Nov 18 13:32, Joel Sherrill wrote:
>>>>>> On 11/18/2013 12:33 PM, Yaakov (Cygwin/X) wrote:
>>>>>>> On 2013-11-18 12:24, Joel Sherrill wrote:
>>>>>>>> I added the realpath() prototype more or less where
>>>>>>>> glibc has it in stdlib.h.
>>>>>>>>
>>>>>>>> Also added restrict to Linux implementation.
>>>>>>>>
>>>>>>>> Does this look ok to commit?
>>>>>>>
>>>>>>> Your patch includes a duplicate declaration of qsort().
>>>>>>
>>>>>> Fixed. Stupid cut and paste.
>>>>>>
>>>>>>> Also, Cygwin provides its own prototype of realpath in
>>>>>>> its own headers, so either that needs to be removed, or
>>>>>>> this prototype placed in a !__CYGWIN__ block; I'll let
>>>>>>> Corinna decide which she prefers.
>>>>>>
>>>>>> Since this wasn't in newlib, I didn't know about it. I have
>>>>>>   been trusting grep. :)
>>>>>>
>>>>>> Whatever Corinna wants to do, I am ok with.
>>>>>
>>>>> Just apply your patch.  I'll remove the Cygwin definition
>>>>> afterwards.
>>>>
>>>> FYI, I moved the readline declaration into the following
>>>> `#ifndef __STRICT_ANSI__' block, analogue to the old
>>>> Cygwin-only declaration.
>>> . Thanks. The guards are tricky. glibc has
>>>
>>> #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
>>>
>>> http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
>>>
>>>
> marks it as XSI with no explicit macros that I am spotting.
>>>
>>> Is that close enough?
>>
>> I don't understand the question.  BSD and XOPEN don't correspond
>> to strict ANSI.
>
> I was just pointing out that glibc has BSD and XOPEN as guards.
> Is that equivalent?

In FreeBSD we have this (<stdlib.h>):

/*
  * Extensions made by POSIX relative to C.  We don't know yet which edition
  * of POSIX made these extensions, so assume they've always been there until
  * research can be done.
  */
#if __POSIX_VISIBLE /* >= ??? */
int	 posix_memalign(void **, size_t, size_t); /* (ADV) */
int	 rand_r(unsigned *);			/* (TSF) */
char	*realpath(const char * __restrict, char * __restrict);
int	 setenv(const char *, const char *, int);
int	 unsetenv(const char *);
#endif

-- 
Sebastian Huber, embedded brains GmbH

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