Function addsettings

src/engine/rules.cpp:333–373

 */

SETTINGS * addsettings( SETTINGS * head, int flag, OBJECT * symbol,
    LIST * value )
{
    SETTINGS * v;

    /* Look for previous settings. */
    for ( v = head; v; v = v->next )
        if ( object_equal( v->symbol, symbol ) )
            break;

    /* If not previously set, alloc a new. */
    /* If appending, do so. */
    /* Else free old and set new. */
    if ( !v )
    {
        v = settings_freelist;
        if ( v )
            settings_freelist = v->next;
        else
            v = (SETTINGS *)BJAM_MALLOC( sizeof( *v ) );

        v->symbol = object_copy( symbol );
        v->value = value;
        v->next = head;
        head = v;
    }
    else if ( flag == VAR_APPEND )
    {
        v->value = list_append( v->value, value );
    }
    else if ( flag != VAR_DEFAULT )
    {
        list_free( v->value );
        v->value = value;
    }
    else
        list_free( value );

    /* Return (new) head of list. */
    return head;
}


/*