| 1 | /* $Id: env-posix.cpp 20821 2009-06-23 12:42:19Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Environment, Posix.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #ifdef RT_OS_DARWIN
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| 36 | /* pick the correct prototype for unsetenv. */
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| 37 | # define _POSIX_C_SOURCE 1
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| 38 | #endif
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| 39 | #include <iprt/env.h>
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| 40 | #include <iprt/string.h>
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| 41 | #include <iprt/alloca.h>
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| 42 | #include <iprt/assert.h>
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| 43 | #if defined(DEBUG) && defined(RT_OS_LINUX)
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| 44 | # include <iprt/asm.h>
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| 45 | #endif
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| 46 |
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| 47 | #include <stdlib.h>
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| 48 | #include <errno.h>
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| 49 |
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| 50 | #include "internal/alignmentchecks.h"
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| 51 |
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| 52 |
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| 53 | RTDECL(bool) RTEnvExist(const char *pszVar)
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| 54 | {
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| 55 | return RTEnvGet(pszVar) != NULL;
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| 56 | }
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| 57 |
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| 58 |
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| 59 | RTDECL(const char *) RTEnvGet(const char *pszVar)
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| 60 | {
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| 61 | IPRT_ALIGNMENT_CHECKS_DISABLE(); /* glibc causes trouble */
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| 62 | const char *pszValue = getenv(pszVar);
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| 63 | IPRT_ALIGNMENT_CHECKS_ENABLE();
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| 64 | return pszValue;
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| 65 | }
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| 66 |
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| 67 |
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| 68 | RTDECL(int) RTEnvPut(const char *pszVarEqualValue)
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| 69 | {
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| 70 | /** @todo putenv is a source memory leaks. deal with this on a per system basis. */
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| 71 | if (!putenv((char *)pszVarEqualValue))
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| 72 | return 0;
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| 73 | return RTErrConvertFromErrno(errno);
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| 74 | }
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| 75 |
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| 76 | RTDECL(int) RTEnvSet(const char *pszVar, const char *pszValue)
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| 77 | {
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| 78 | #if defined(_MSC_VER)
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| 79 | /* make a local copy and feed it to putenv. */
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| 80 | const size_t cchVar = strlen(pszVar);
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| 81 | const size_t cchValue = strlen(pszValue);
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| 82 | char *pszTmp = (char *)alloca(cchVar + cchValue + 2 + !*pszValue);
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| 83 | memcpy(pszTmp, pszVar, cchVar);
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| 84 | pszTmp[cchVar] = '=';
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| 85 | if (*pszValue)
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| 86 | memcpy(pszTmp + cchVar + 1, pszValue, cchValue + 1);
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| 87 | else
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| 88 | {
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| 89 | pszTmp[cchVar + 1] = ' '; /* wrong, but putenv will remove it otherwise. */
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| 90 | pszTmp[cchVar + 2] = '\0';
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| 91 | }
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| 92 |
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| 93 | if (!putenv(pszTmp))
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| 94 | return 0;
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| 95 | return RTErrConvertFromErrno(errno);
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| 96 |
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| 97 | #else
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| 98 | if (!setenv(pszVar, pszValue, 1))
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| 99 | return VINF_SUCCESS;
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| 100 | return RTErrConvertFromErrno(errno);
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| 101 | #endif
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| 102 | }
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| 103 |
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| 104 |
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| 105 | RTDECL(int) RTEnvUnset(const char *pszVar)
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| 106 | {
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| 107 | AssertReturn(!strchr(pszVar, '='), VERR_INVALID_PARAMETER);
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| 108 |
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| 109 | /* Check that it exists first. */
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| 110 | if (!RTEnvExist(pszVar))
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| 111 | return VINF_ENV_VAR_NOT_FOUND;
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| 112 |
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| 113 | /* Ok, try remove it. */
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| 114 | #ifdef RT_OS_WINDOWS
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| 115 | /* Windows does not have unsetenv(). Clear the environment variable according to the MSN docs. */
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| 116 | char *pszBuf;
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| 117 | int rc = RTStrAPrintf(&pszBuf, "%s=", pszVar);
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| 118 | if (RT_FAILURE(rc))
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| 119 | return rc;
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| 120 | rc = putenv(pszBuf);
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| 121 | RTStrFree(pszBuf);
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| 122 | if (!rc)
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| 123 | return VINF_SUCCESS;
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| 124 | #else
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| 125 | /* This is the preferred function as putenv() like used above does neither work on Solaris nor on Darwin. */
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| 126 | if (!unsetenv((char*)pszVar))
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| 127 | return VINF_SUCCESS;
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| 128 | #endif
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| 129 |
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| 130 | return RTErrConvertFromErrno(errno);
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| 131 | }
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| 132 |
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