/* $Id: env-posix.cpp 33464 2010-10-26 12:27:50Z vboxsync $ */ /** @file * IPRT - Environment, Posix. */ /* * Copyright (C) 2006-2007 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 * *******************************************************************************/ #ifdef RT_OS_DARWIN /* pick the correct prototype for unsetenv. */ # define _POSIX_C_SOURCE 1 #endif #include #include #include #include #if defined(DEBUG) && defined(RT_OS_LINUX) # include #endif #include #include #include "internal/alignmentchecks.h" RTDECL(bool) RTEnvExist(const char *pszVar) { return RTEnvGet(pszVar) != NULL; } RTDECL(const char *) RTEnvGet(const char *pszVar) { IPRT_ALIGNMENT_CHECKS_DISABLE(); /* glibc causes trouble */ const char *pszValue = getenv(pszVar); IPRT_ALIGNMENT_CHECKS_ENABLE(); return pszValue; } RTDECL(int) RTEnvPut(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) RTEnvSet(const char *pszVar, const char *pszValue) { #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) RTEnvUnset(const char *pszVar) { AssertReturn(!strchr(pszVar, '='), VERR_INVALID_PARAMETER); /* * 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); }