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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2017 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_os_utils
#define OSG_os_utils 1
#include <osg/Export>
#ifdef __cplusplus
extern "C" {
#endif
/** Cross platform version of C system() function. */
extern OSG_EXPORT int osg_system(const char* str);
#ifdef __cplusplus
}
#endif
#ifdef __cplusplus
#include <string>
#if defined(OSG_ENVVAR_SUPPORTED)
#include <stdlib.h>
#include <sstream>
#endif
namespace osg {
inline unsigned int getClampedLength(const char* str, unsigned int maxNumChars=4096)
{
unsigned int i = 0;
while(i<maxNumChars && str[i]!=0) { ++i; }
return i;
}
inline std::string getEnvVar(const char* name)
{
#ifdef OSG_ENVVAR_SUPPORTED
std::string value;
const char* ptr = getenv(name);
if (ptr) value.assign(ptr, getClampedLength(ptr));
return value;
#else
OSG_UNUSED(name);
return std::string();
#endif
}
template<typename T>
inline bool getEnvVar(const char* name, T& value)
{
#ifdef OSG_ENVVAR_SUPPORTED
const char* ptr = getenv(name);
if (!ptr) return false;
std::istringstream str(std::string(ptr, getClampedLength(ptr)));
str >> value;
return !str.fail();
#else
OSG_UNUSED2(name, value);
return false;
#endif
}
template<>
inline bool getEnvVar(const char* name, std::string& value)
{
#ifdef OSG_ENVVAR_SUPPORTED
const char* ptr = getenv(name);
if (!ptr) return false;
value.assign(ptr, getClampedLength(ptr));
return true;
#else
OSG_UNUSED2(name, value);
return false;
#endif
}
template<typename T1, typename T2>
inline bool getEnvVar(const char* name, T1& value1, T2& value2)
{
#ifdef OSG_ENVVAR_SUPPORTED
const char* ptr = getenv(name);
if (!ptr) return false;
std::istringstream str(std::string(ptr, getClampedLength(ptr)));
str >> value1 >> value2;
return !str.fail();
#else
OSG_UNUSED3(name, value1, value2);
return false;
#endif
}
template<typename T1, typename T2, typename T3>
inline bool getEnvVar(const char* name, T1& value1, T2& value2, T3& value3)
{
#ifdef OSG_ENVVAR_SUPPORTED
const char* ptr = getenv(name);
if (!ptr) return false;
std::istringstream str(std::string(ptr, getClampedLength(ptr)));
str >> value1 >> value2 >> value3;
return !str.fail();
#else
OSG_UNUSED4(name, value1, value2, value3);
return false;
#endif
}
template<typename T1, typename T2, typename T3, typename T4>
inline bool getEnvVar(const char* name, T1& value1, T2& value2, T3& value3, T4& value4)
{
#ifdef OSG_ENVVAR_SUPPORTED
const char* ptr = getenv(name);
if (!ptr) return false;
std::istringstream str(std::string(ptr, getClampedLength(ptr)));
str >> value1 >> value2 >> value3 >> value4;
return !str.fail();
#else
OSG_UNUSED5(name, value1, value2, value3, value4);
return false;
#endif
}
}
#endif // _cplusplus
# endif
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