randomize.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
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 *----------------------------------------------------------------------------
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 * (la "Licenza"); è proibito usare questo file se non in conformità alla
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

void randomize( Environment * _environment, char * _other_seed ) {
 
    Variable * seed = variable_retrieve( _environment, "CPURANDOM_SEED" );
 
    if ( _other_seed ) {
        Variable * external_seed = variable_retrieve_or_define( _environment, _other_seed, VT_DWORD, 0xff11ff00 );
        variable_move( _environment, variable_xor( _environment, external_seed->name, seed->name )->name, seed->name );
    } else {
        variable_store( _environment, seed->name, 0xf0f0f0f0 );
    }
 
    cpu_random_8bit( _environment, NULL, NULL );
 
}