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/* $Id: env-posix.cpp $ */
/** @file
* IPRT - Environment, Posix.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#ifdef RT_OS_DARWIN
/* pick the correct prototype for unsetenv. */
# define _POSIX_C_SOURCE 1
#endif
#include <iprt/env.h>
#include <iprt/alloca.h>
#include <iprt/assert.h>
#if defined(DEBUG) && defined(RT_OS_LINUX)
# include <iprt/asm.h>
#endif
#include <iprt/err.h>
#include <iprt/string.h>
#include <stdlib.h>
#include <errno.h>
#include "internal/alignmentchecks.h"
RTDECL(bool) RTEnvExistsBad(const char *pszVar)
{
AssertReturn(strchr(pszVar, '=') == NULL, false);
return RTEnvGetBad(pszVar) != NULL;
}
RTDECL(bool) RTEnvExist(const char *pszVar)
{
return RTEnvExistsBad(pszVar);
}
RTDECL(const char *) RTEnvGetBad(const char *pszVar)
{
AssertReturn(strchr(pszVar, '=') == NULL, NULL);
IPRT_ALIGNMENT_CHECKS_DISABLE(); /* glibc causes trouble */
const char *pszValue = getenv(pszVar);
IPRT_ALIGNMENT_CHECKS_ENABLE();
return pszValue;
}
RTDECL(const char *) RTEnvGet(const char *pszVar)
{
return RTEnvGetBad(pszVar);
}
RTDECL(int) RTEnvPutBad(const char *pszVarEqualValue)
{
/** @todo putenv is a source memory leaks. deal with this on a per system basis. */
if (!putenv((char *)pszVarEqualValue))
return 0;
return RTErrConvertFromErrno(errno);
}
RTDECL(int) RTEnvPut(const char *pszVarEqualValue)
{
return RTEnvPutBad(pszVarEqualValue);
}
RTDECL(int) RTEnvSetBad(const char *pszVar, const char *pszValue)
{
AssertMsgReturn(strchr(pszVar, '=') == NULL, ("'%s'\n", pszVar), VERR_ENV_INVALID_VAR_NAME);
#if defined(_MSC_VER)
/* make a local copy and feed it to putenv. */
const size_t cchVar = strlen(pszVar);
const size_t cchValue = strlen(pszValue);
char *pszTmp = (char *)alloca(cchVar + cchValue + 2 + !*pszValue);
memcpy(pszTmp, pszVar, cchVar);
pszTmp[cchVar] = '=';
if (*pszValue)
memcpy(pszTmp + cchVar + 1, pszValue, cchValue + 1);
else
{
pszTmp[cchVar + 1] = ' '; /* wrong, but putenv will remove it otherwise. */
pszTmp[cchVar + 2] = '\0';
}
if (!putenv(pszTmp))
return 0;
return RTErrConvertFromErrno(errno);
#else
if (!setenv(pszVar, pszValue, 1))
return VINF_SUCCESS;
return RTErrConvertFromErrno(errno);
#endif
}
RTDECL(int) RTEnvSet(const char *pszVar, const char *pszValue)
{
return RTEnvSetBad(pszVar, pszValue);
}
RTDECL(int) RTEnvUnsetBad(const char *pszVar)
{
AssertReturn(strchr(pszVar, '=') == NULL, VERR_ENV_INVALID_VAR_NAME);
/*
* Check that it exists first.
*/
if (!RTEnvExist(pszVar))
return VINF_ENV_VAR_NOT_FOUND;
/*
* Ok, try remove it.
*/
#ifdef RT_OS_WINDOWS
/* Use putenv(var=) since Windows does not have unsetenv(). */
size_t cchVar = strlen(pszVar);
char *pszBuf = (char *)alloca(cchVar + 2);
memcpy(pszBuf, pszVar, cchVar);
pszBuf[cchVar] = '=';
pszBuf[cchVar + 1] = '\0';
if (!putenv(pszBuf))
return VINF_SUCCESS;
#else
/* This is the preferred function as putenv() like used above does neither work on Solaris nor on Darwin. */
if (!unsetenv((char*)pszVar))
return VINF_SUCCESS;
#endif
return RTErrConvertFromErrno(errno);
}
RTDECL(int) RTEnvUnset(const char *pszVar)
{
return RTEnvUnsetBad(pszVar);
}
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