| 1 | /* $Id: RTEnvDupEx-generic.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Environment, RTEnvDupEx, generic.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2010-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/env.h>
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| 32 | #include "internal/iprt.h"
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/errcore.h>
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| 36 | #include <iprt/string.h>
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| 37 |
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| 38 |
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| 39 |
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| 40 | RTDECL(char *) RTEnvDupEx(RTENV Env, const char *pszVar)
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| 41 | {
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| 42 | /*
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| 43 | * Try with a small buffer. This helps avoid allocating a heap buffer for
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| 44 | * variables that doesn't exist.
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| 45 | */
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| 46 | char szSmall[256];
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| 47 | int rc = RTEnvGetEx(Env, pszVar, szSmall, sizeof(szSmall), NULL);
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| 48 | if (RT_SUCCESS(rc))
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| 49 | return RTStrDup(szSmall);
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| 50 | if (rc != VERR_BUFFER_OVERFLOW)
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| 51 | return NULL;
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| 52 |
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| 53 | /*
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| 54 | * It's a big bugger.
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| 55 | */
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| 56 | size_t cbBuf = _1K;
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| 57 | do
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| 58 | {
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| 59 | char *pszBuf = RTStrAlloc(cbBuf);
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| 60 | AssertBreak(pszBuf);
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| 61 |
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| 62 | rc = RTEnvGetEx(Env, pszVar, pszBuf, cbBuf, NULL);
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| 63 | if (RT_SUCCESS(rc))
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| 64 | return pszBuf;
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| 65 |
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| 66 | RTStrFree(pszBuf);
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| 67 |
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| 68 | /* If overflow double the buffer. */
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| 69 | if (rc != VERR_BUFFER_OVERFLOW)
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| 70 | break;
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| 71 | cbBuf *= 2;
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| 72 | } while (cbBuf < _64M);
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| 73 |
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| 74 | return NULL;
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| 75 | }
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| 76 | RT_EXPORT_SYMBOL(RTEnvDupEx);
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| 77 |
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