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Re: native Win32 guile 1.7.0
From: |
Kevin Ryde |
Subject: |
Re: native Win32 guile 1.7.0 |
Date: |
Thu, 12 Jun 2003 09:54:05 +1000 |
User-agent: |
Gnus/5.090019 (Oort Gnus v0.19) Emacs/21.2 (gnu/linux) |
stefan <address@hidden> writes:
>
> 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';
}
}
- Re: native Win32 guile 1.7.0, Kevin Ryde, 2003/06/08
- Re: native Win32 guile 1.7.0, Kevin Ryde, 2003/06/11
- Re: native Win32 guile 1.7.0,
Kevin Ryde <=
- Re: native Win32 guile 1.7.0, stefan, 2003/06/14
- Re: native Win32 guile 1.7.0, Marius Vollmer, 2003/06/14
- Re: native Win32 guile 1.7.0, stefan, 2003/06/14
- Re: native Win32 guile 1.7.0, Marius Vollmer, 2003/06/14
- Re: native Win32 guile 1.7.0, stefan, 2003/06/16
- Re: native Win32 guile 1.7.0, Marius Vollmer, 2003/06/18