From: stefan <stefan@lkcc.org>
Cc: guile-devel@gnu.org
Subject: Re: native Win32 guile 1.7.0
Date: Sat, 14 Jun 2003 07:36:24 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.44.0306140734580.2281-100000@bono.reversers.net> (raw)
In-Reply-To: <87k7bsmaqq.fsf@zip.com.au>
On Thu, 12 Jun 2003, Kevin Ryde wrote:
> > I just added a check for unsetenv() in the configure script and used it in
> > posix.c appropiately for mingw32 hosts. Which means that a
> > putenv("name="); would remove the environment variable 'name'.
>
> I guess this means it's not possible to use putenv("name=") to set
> name to an empty string. I'm pretty sure it's valid to do so on other
> systems.
>
> On wine, which might not be the same as a real mingw, setting "name= "
> and then changing that space to a \0 does the trick. Bit nasty to go
> changing putenvs strings like that, but unless there's a setenv or
> some function hiding then there might be no choice. Eg, (untested),
>
>
>
> /* If str is "FOO=", ie. attempting to set an empty string, then we
> need to see if it's been successful. On MINGW, "FOO=" means remove
> FOO from the environment. As a workaround, we set "FOO= ", ie. a
> space, and then modify the string returned by getenv. It's not
> enough just to modify the string we set, because MINGW putenv
> copies it. */
> if (ptr[SCM_STRING_LENGTH(str)-1] == '=')
> {
> SCM name = scm_substring (str, SCM_MAKINUM (0),
> SCM_MAKINUM (SCM_STRING_LENGTH (str) - 1));
> if (getenv (SCM_STRING_CHARS (name)) == NULL)
> {
> char *alt = scm_malloc (SCM_STRING_LENGTH (str) + 2);
> memcpy (alt, SCM_STRING_CHARS (str), SCM_STRING_LENGTH(str));
> alt[SCM_STRING_LENGTH(str)] = ' ';
> alt[SCM_STRING_LENGTH(str)+1] = '\0';
> rv = putenv (alt);
> if (rv < 0)
> SCM_SYSERROR;
> free (ptr); /* don't need the old string we gave to putenv */
> alt = getenv (SCM_STRING_CHARS (name));
> alt[SCM_STRING_LENGTH(str)] = '\0';
> }
> }
I tested this piece of code on my Win95 box and modified it a bit to get
it really working. Then I applied the code CVS. The (putenv) primitive
now behaves equally on GNU/Linux and Win32.
Cheers,
stefan@lkcc.org
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next prev parent reply other threads:[~2003-06-14 5:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-29 14:31 native Win32 guile 1.7.0 stefan
2003-05-29 23:13 ` Kevin Ryde
2003-05-29 23:23 ` Kevin Ryde
2003-05-30 3:23 ` stefan
2003-05-30 23:58 ` Kevin Ryde
2003-06-11 23:42 ` Kevin Ryde
2003-05-30 9:27 ` stefan
2003-05-31 0:20 ` Kevin Ryde
2003-06-08 22:03 ` Kevin Ryde
2003-06-11 23:15 ` Kevin Ryde
2003-06-12 5:01 ` stefan
2003-06-15 0:15 ` putenv tests (was: native Win32 guile 1.7.0) Kevin Ryde
2003-06-11 23:54 ` native Win32 guile 1.7.0 Kevin Ryde
2003-06-14 5:36 ` stefan [this message]
2003-06-14 12:24 ` Marius Vollmer
2003-06-14 13:46 ` stefan
2003-06-14 16:18 ` Marius Vollmer
2003-06-16 17:25 ` stefan
2003-06-18 23:42 ` Marius Vollmer
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