Sender: salvador AT delorie DOT com
Message-ID: <3BB9C9AA.7B4E13BF@inti.gov.ar>
Date: Tue, 02 Oct 2001 11:05:31 -0300
From: salvador <salvador AT inti DOT gov DOT ar>
Organization: INTI
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To: djgpp-workers AT delorie DOT com
Subject: Re: putenv question
References: <10110020339 DOT AA16416 AT clio DOT rice DOT edu> <1002006261 DOT 19672 DOT 6 DOT camel AT bender DOT falconsoft DOT be>
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Reply-To: djgpp-workers AT delorie DOT com

Tim Van Holder wrote:

> On Tue, 2001-10-02 at 05:39, Charles Sandmann wrote:
> > I don't have a posix standard, so a simple question ...
> >
> > putenv in 2.03 took a const char * argument
> >
> > When it was moved to the posix section in cvs it is no longer const
> > When I passed the const strings "lfn=" in mntent I had to unconst
> > the strings to avoid warnings.  Is it against the standard or some
> > other way bad for this to be const in the headers?  Just wondering.
>
> Since the POSIX draft standard listed putenv's argument as a non-const
> char*, I changed our implementation to match (and added a note about
> this to wc204.txi).
> I don't really see why it can't be const, but I felt it would be best to
> follow the standard.

Perhaps is related to the fact that not all implementations makes a copy (as
djgpp does) and hence a const could generate problems.
What is supposed to return getenv() according to the standard? is it a char
*?
The djgpp's help clearly states the behavior of putenv and warns about what
other implementations does, but I felt victim of a stupid bug anyways:

void function()
{
 char buffer[xx];
 strcpy(buffer,...);
 putenv(buffer);
}

;-)
Of course it generates really bizarre things with GNU libc (which doesn't
copy the string).

SET

--
Salvador Eduardo Tropea (SET). (Electronics Engineer)
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