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4b04137e7d
impossible to override configuration settings. git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@13549 57a11ea4-9604-0410-9ed3-97b8803252fd
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/********************************************************************\
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* File: setenv.c
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* Renamed from: core-utils.c
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*
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* Copyright (C) 2001 Linux Developers Group
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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\********************************************************************/
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#include "config.h"
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#include <glib.h>
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#include <glib/gprintf.h>
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#include <stdlib.h>
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#include <string.h>
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#include "setenv.h"
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/* This setenv() papers over the brokenness of of systems that only
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* have putenv() which takes ownership of the pointer you give it,
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* making it *very* difficult, if not impossible to avoid memory
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* leaks. Note that right now, on systems that have setenv, this is
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* just setenv, and on other systems, we just leave the memory leak.
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* Later, we may try to make things a little better by keeping track
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* of the pointers we call putenv on in a hash table and if someone
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* calls gnc_setenv on an envt var that we've previously set, then
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* we'll free it after the change. However, given the sloppy
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* semantics (or docs) for putenv, it's not even clear that this is
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* OK, since it's not clear that people aren't allowed to keep the
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* pointer from getenv around, as long as they don't try to modify
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* it... <shrug> */
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#ifndef HAVE_SETENV
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int
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setenv(const char *name, const char *value, int overwrite)
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{
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const char *old_value = getenv(name);
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int result = 0;
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if ((name == NULL) || (value == NULL)) return -1;
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if(overwrite || (!old_value))
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{
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char *new_value = g_strdup_printf("%s=%s", name, value);
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if(putenv(new_value) != 0) result = -1;
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if(old_value)
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{
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/* for now, do nothing, but it would be nice if we could figure
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out a safe way to reclaim any memory that *we* allocated,
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taking in to account whether or not other code (in other
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system libs) is allowed to have cached a pointer into the
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value via getenv -- is that kosher?
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Also we have to *know* that we allocated the memory.
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*/
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}
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}
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return result;
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}
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int
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unsetenv(const char *name)
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{
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int result = 0;
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char *putenv_str;
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if(name == NULL) return -1;
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if(strchr(name, '=') != NULL) return -1;
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if(*name == '\0') return -1;
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putenv_str = g_strdup_printf("%s=", name);
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if(!putenv_str) return -1;
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result = putenv(putenv_str);
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g_free(putenv_str);
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return result;
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}
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#endif
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