remember.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/
 
/* <usermanual>
@keyword REMEMBER
 
@english
The ''REMEMBER'' command restores the cursor position previously stored by 
the ''MEMORIZE'' command. The ''REMEMBER'' command can be executed multiple
times, and this will restore the cursor position to the last stored position. 
Note that the stored position refers to the current console. If there are no 
consoles defined, one equal to full screen will be defined.
 
@italian
Il comando ''REMEMBER'' ripristina la posizione del cursore precedentemente 
memorizzata dal comando ''MEMORIZE''. Il comando ''REMEMBER'' può essere 
eseguito più volte, e questo ripristinerà la posizione del cursore alla 
posizione memorizzata per ultima. Da notare che la posizione memorizzata 
è riferita alla console attuale. Se non vi sono console definite, ne 
sarà definita una pari allo schermo intero.
 
@syntax REMEMBER
 
@example REMEMBER
 
@usedInExample texts_tracking_02.bas
 
@seeAlso MEMORIZE
@target all
</usermanual> */
void remember( Environment * _environment ) {
    
    MAKE_LABEL
 
    deploy_begin( remember );
 
        char doNothingLabel2[MAX_TEMPORARY_STORAGE];
        sprintf( doNothingLabel2, "%sdonothing", label );
        
        cpu_compare_and_branch_8bit_const( _environment, "CONSOLEID", 0xff, doNothingLabel2, 0 );
        console( _environment, 0, 0, _environment->screenTilesWidth - 1, _environment->screenTilesHeight - 1 );
        console_save( _environment, 0 );
        cpu_label( _environment, doNothingLabel2 );
 
        Variable * xcursys = variable_retrieve( _environment, "XCURSYS" );
        Variable * ycursys = variable_retrieve( _environment, "YCURSYS" );
 
        Variable * address = variable_temporary( _environment, VT_ADDRESS, "(consoles)" );
        cpu_addressof_16bit( _environment, "CONSOLES2", address->realName  );
 
        Variable * actualNumber = variable_temporary( _environment, VT_BYTE, 0 );
        cpu_move_8bit( _environment, "CONSOLEID", actualNumber->realName );
        cpu_math_mul2_const_8bit( _environment, actualNumber->realName, 1, 0 );
        cpu_math_add_16bit_with_8bit( _environment, address->realName, actualNumber->realName, address->realName );
 
        cpu_move_8bit_indirect2( _environment, address->realName, xcursys->realName );
        cpu_inc_16bit( _environment, address->realName );
        cpu_move_8bit_indirect2( _environment, address->realName, ycursys->realName );
 
        cpu_return( _environment ); 
    
    deploy_end( remember );
 
    cpu_call( _environment, "lib_remember");
 
}