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/* $Id: RTEnvDupEx-generic.cpp $ */
/** @file
* IPRT - Environment, RTEnvDupEx, generic.
*/
/*
* Copyright (C) 2010-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/env.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
#include <iprt/mem.h>
RTDECL(char *) RTEnvDupEx(RTENV Env, const char *pszVar)
{
/*
* Try with a small buffer. This helps avoid allocating a heap buffer for
* variables that doesn't exist.
*/
char szSmall[256];
int rc = RTEnvGetEx(Env, pszVar, szSmall, sizeof(szSmall), NULL);
if (RT_SUCCESS(rc))
return RTStrDup(szSmall);
if (rc != VERR_BUFFER_OVERFLOW)
return NULL;
/*
* It's a bug bugger.
*/
size_t cbBuf = _1K;
char *pszBuf = (char *)RTMemAlloc(cbBuf);
for (;;)
{
rc = RTEnvGetEx(Env, pszVar, pszBuf, cbBuf, NULL);
if (RT_SUCCESS(rc))
return pszBuf; /* ASSUMES RTMemAlloc can be freed by RTStrFree! */
if (rc != VERR_BUFFER_OVERFLOW)
break;
if (cbBuf >= 64 * _1M)
break;
cbBuf *= 2;
char *pszNew = (char *)RTMemRealloc(pszBuf, cbBuf);
if (!pszNew)
break;
pszBuf = pszNew;
}
RTMemFree(pszBuf);
return NULL;
}
RT_EXPORT_SYMBOL(RTEnvGetExecEnvP);
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