random.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
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *----------------------------------------------------------------------------
 * Concesso in licenza secondo i termini della Licenza Apache, versione 2.0
 * (la "Licenza"); è proibito usare questo file se non in conformità alla
 * Licenza. Una copia della Licenza è disponibile all'indirizzo:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Se non richiesto dalla legislazione vigente o concordato per iscritto,
 * il software distribuito nei termini della Licenza è distribuito
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 * implicite. Consultare la Licenza per il testo specifico che regola le
 * autorizzazioni e le limitazioni previste dalla medesima.
 ****************************************************************************/
 
/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

Variable * random_value( Environment * _environment, VariableType _type ) {
 
    Variable * seed = variable_retrieve( _environment, "CPURANDOM_SEED" );
 
    Variable * result = variable_temporary( _environment, _type, "(random value)" );
    Variable * temp = variable_temporary( _environment, _type, "(temp value)" );
 
    char resultAddress[MAX_TEMPORARY_STORAGE]; sprintf( resultAddress, "%s", temp->realName );
    cpu_in_direct( _environment, "$DC08", resultAddress );
    sprintf( resultAddress, "%s+1", temp->realName );
    cpu_in_direct( _environment, "$DC09", resultAddress );
    sprintf( resultAddress, "%s", temp->realName );
 
    switch( VT_BITWIDTH( _type ) ) {
        case 8:
           cpu_random_8bit( _environment, resultAddress, result->realName );
            break;
        case 16:
           cpu_random_16bit( _environment, resultAddress, result->realName );
            break;
        case 32:
           cpu_random_32bit( _environment, resultAddress, result->realName );
            break;
        default:
            CRITICAL_CANNOT_GENERATE_RANDOM( );            
    }
 
    return result;
 
}