//========= Copyright Valve Corporation ============//
#include "envvartools_public.h"
#include <stdlib.h>

#if defined(_WIN32)
#include <windows.h>

#undef GetEnvironmentVariable
#undef SetEnvironmentVariable
#endif


std::string GetEnvironmentVariable( const char *pchVarName )
{
#if defined(_WIN32)
	char rchValue[32767]; // max size for an env var on Windows
	DWORD cChars = GetEnvironmentVariableA( pchVarName, rchValue, sizeof( rchValue ) );
	if( cChars == 0 )
		return "";
	else
		return rchValue;
#elif defined(POSIX)
	char *pchValue = getenv( pchVarName );
	if( pchValue )
		return pchValue;
	else
		return "";
#else
#error "Unsupported Platform"
#endif
}


bool SetEnvironmentVariable( const char *pchVarName, const char *pchVarValue )
{
#if defined(_WIN32)
	return 0 != SetEnvironmentVariableA( pchVarName, pchVarValue );
#elif defined(POSIX)
	if( pchVarValue == NULL )
		return 0 == unsetenv( pchVarName );
	else
		return 0 == setenv( pchVarName, pchVarValue, 1 );
#else
#error "Unsupported Platform"
#endif
}