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/*****************************************************************************
*
* Copyright (c) 2000 - 2017, Lawrence Livermore National Security, LLC
* Produced at the Lawrence Livermore National Laboratory
* LLNL-CODE-442911
* All rights reserved.
*
* This file is part of VisIt. For details, see https://visit.llnl.gov/. The
* full copyright notice is contained in the file COPYRIGHT located at the root
* of the VisIt distribution or at http://www.llnl.gov/visit/copyright.html.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the disclaimer (as noted below) in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of the LLNS/LLNL nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL LAWRENCE LIVERMORE NATIONAL SECURITY,
* LLC, THE U.S. DEPARTMENT OF ENERGY OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*****************************************************************************/
// ************************************************************************* //
// Environment.C //
// ************************************************************************* //
#ifndef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 200112L
#endif
#include <cstdlib>
#include <cstring>
#include <errno.h>
#ifdef _WIN32
# include <windows.h>
#endif
#include <Environment.h>
#include <DebugStream.h>
#include <snprintf.h>
namespace Environment {
// ****************************************************************************
// Function: Environment::get
//
// Purpose: Obtains a value from the environment.
// `getenv' appears to be pretty standard; we don't do anything
// special here.
//
// Programmer: Tom Fogal
//
// ****************************************************************************
std::string
get(const char *variable)
{
const char *value = getenv(variable);
if (value == NULL)
{
std::string str;
return str;
}
return std::string(value);
}
// ****************************************************************************
// Function: Environment::get
//
// Purpose: Predicate to determine whether a variable is defined.
//
// Programmer: Tom Fogal
//
// ****************************************************************************
bool
exists(const char *variable)
{
char *value = getenv(variable);
if(value == NULL)
{
return false;
}
return true;
}
// ****************************************************************************
// Function: Environment::set
//
// Purpose: Sets a value in the enviroment. Avoid using putenv, since it
// requires static memory.
//
// Programmer: Tom Fogal
//
// Modifications:
//
// Tom Fogal, Thu Apr 30 12:08:07 MDT 2009
// Do the right thing on Windows (untested..)
//
// ****************************************************************************
void
set(const char *k, const char *v)
{
#ifdef _WIN32
if(SetEnvironmentVariable(k, v) == 0)
#else
if(setenv(k, v, 1) != 0)
#endif
{
debug1 << "setenv(" << k << " = " << v << ") failed!" << std::endl
#ifdef _WIN32
<< "Error: " << GetLastError() << std::endl;
#else
<< "Error: " << errno << ": '" << strerror(errno) << std::endl;
#endif
}
}
// ****************************************************************************
// Function: Environment::unset
//
// Purpose: Removes a variable definition from the environment.
//
// Programmer: Tom Fogal
//
// ****************************************************************************
void
unset(const char *variable)
{
#ifdef HAVE_UNSETENV
# ifdef __APPLE__
// Apple's unsetenv returns void; no error checking is possible.
unsetenv(variable);
# else
if(unsetenv(variable) != 0)
{
debug1 << "unsetenv(" << variable << ") failed!" << std::endl
<< "Error: " << errno << ": '" << strerror(errno) << std::endl;
}
# endif
#else
// level 5 because it doesn't usually matter if we clean up our environment
// correctly; OS will do it when our process exits anyway.
debug5 << "unsetenv(" << variable << ") ignored; unsetenv not supported "
<< "on this platform." << std::endl;
#endif
}
}; /* namespace Environment */
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