cset.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.
 * You may obtain a copy of the License at
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/
 
 
/* <usermanual>
@keyword CSET
 
@english
 
The ''CSET'' command switches with ''value'' between the two character sets 
of the VIC-II: uppercase graphics characters (0) and uppercase/lowercase 
(CSET 1). You can also use this to switch to graphics mode without clearing 
the graphics memory (see ''HIRES''), for this you use CSET 2. 
 
@italian
 
Il comando ''CSET'' commuta con ''value'' tra i due set di caratteri
del VIC-II: caratteri grafici maiuscoli (0) e maiuscolo/minuscolo
(CSET 1). È possibile utilizzarlo anche per passare alla modalità grafica 
senza cancellare la memoria grafica (vedere ''HIRES''), per questo si 
utilizza CSET 2.
 
@syntax CSET value
 
@example CSET 1
 
@target c64
@target c64reu
@target c128
 
</usermanual> */
 
 
 
 
void cset( Environment * _environment, char * _value ) {
 
    MAKE_LABEL
 
    Variable * value = variable_retrieve_or_define( _environment, _value, VT_BYTE, 0 );
 
    char l1Label[MAX_TEMPORARY_STORAGE]; sprintf( l1Label, "%sl1", label );
    char l2Label[MAX_TEMPORARY_STORAGE]; sprintf( l2Label, "%sl2", label );
    char l3Label[MAX_TEMPORARY_STORAGE]; sprintf( l3Label, "%sl3", label );
 
    cpu_compare_and_branch_8bit_const( _environment, value->realName, 1, l1Label, 1 );
    cpu_compare_and_branch_8bit_const( _environment, value->realName, 2, l2Label, 1 );
    cpu_compare_and_branch_8bit_const( _environment, value->realName, 3, l3Label, 1 );
    cpu_jump( _environment, label );
 
    cpu_label( _environment, l1Label );
    if ( _environment->fontConfig.schema || _environment->descriptors ) {
        charset_uppercase( _environment );
    } else {
        charset_lowercase( _environment );
    }
    cpu_jump( _environment, label );
 
    cpu_label( _environment, l2Label );
    if ( _environment->fontConfig.schema || _environment->descriptors ) {
        charset_lowercase( _environment );
    } else {
        charset_uppercase( _environment );
    }
    cpu_jump( _environment, label );
 
    cpu_label( _environment, l3Label );
    hires( _environment, NULL, NULL );
    cpu_jump( _environment, label );
 
    cpu_label( _environment, label );
 
}