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//========= Copyright Valve Corporation ============//
#include "envvartools_public.h"
#include "strtools_public.h"
#include <stdlib.h>
#include <string>
#include <cctype>
#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 GetEnvironmentVariableAsBool( const char *pchVarName, bool bDefault )
{
std::string sValue = GetEnvironmentVariable( pchVarName );
if ( sValue.empty() )
{
return bDefault;
}
sValue = StringToLower( sValue );
std::string sYesValues[] = { "y", "yes", "true" };
std::string sNoValues[] = { "n", "no", "false" };
for ( std::string &sMatch : sYesValues )
{
if ( sMatch == sValue )
{
return true;
}
}
for ( std::string &sMatch : sNoValues )
{
if ( sMatch == sValue )
{
return false;
}
}
if ( std::isdigit( sValue.at(0) ) )
{
return atoi( sValue.c_str() ) != 0;
}
fprintf( stderr,
"GetEnvironmentVariableAsBool(%s): Unable to parse value '%s', using default %d\n",
pchVarName, sValue.c_str(), bDefault );
return bDefault;
}
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
}
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