Function var_get

src/engine/variable.cpp:166–264

 */

LIST * var_get( struct module_t * module, OBJECT * symbol )
{
    LIST * result = L0;
#ifdef OPT_AT_FILES
    /* Some "fixed" variables... */
    if ( object_equal( symbol, constant_TMPDIR ) )
    {
        list_free( saved_var );
        result = saved_var = list_new( object_new( path_tmpdir()->value ) );
    }
    else if ( object_equal( symbol, constant_TMPNAME ) )
    {
        list_free( saved_var );
        result = saved_var = list_new( path_tmpnam() );
    }
    else if ( object_equal( symbol, constant_TMPFILE ) )
    {
        list_free( saved_var );
        result = saved_var = list_new( path_tmpfile() );
    }
    else if ( object_equal( symbol, constant_STDOUT ) )
    {
        list_free( saved_var );
        result = saved_var = list_new( object_copy( constant_STDOUT ) );
    }
    else if ( object_equal( symbol, constant_STDERR ) )
    {
        list_free( saved_var );
        result = saved_var = list_new( object_copy( constant_STDERR ) );
    }
    else
#endif
    {
        VARIABLE * v;
        int n;

        if ( ( n = module_get_fixed_var( module, symbol ) ) != -1 )
        {
            if ( DEBUG_VARGET )
                var_dump( symbol, module->fixed_variables[ n ], "get" );
            result = module->fixed_variables[ n ];
        }
        else if ( module->variables && ( v = (VARIABLE *)hash_find(
            module->variables, symbol ) ) )
        {
            if ( DEBUG_VARGET )
                var_dump( v->symbol, v->value, "get" );
            result = v->value;
        }

#ifdef OS_VMS
        else if ( ( module->name && object_equal( module->name, constant_ENVIRON ) )
                  || root_module() == module )
        {
            /* On VMS, when a variable from root or ENVIRON module is not found,
             * explicitly request it from the process.
             * By design, process variables (and logicals) are not made available
             * to C main(), and thus will not get loaded in bulk to root/ENVRON.