text_get_at.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
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 *
 * http://www.apache.org/licenses/LICENSE-2.0
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 * Se non richiesto dalla legislazione vigente o concordato per iscritto,
 * il software distribuito nei termini della Licenza è distribuito
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

Variable * get_at( Environment * _environment, char * _x, char * _y ) {
    
    Variable * x = variable_retrieve_or_define( _environment, _x, VT_BYTE, 0 );
    Variable * y = variable_retrieve_or_define( _environment, _y, VT_BYTE, 0 );
 
    Variable * result = variable_temporary( _environment, VT_DSTRING, 0 );
 
    char resultString[MAX_TEMPORARY_STORAGE]; sprintf( resultString, "\x4  " );
 
    variable_store_string(_environment, result->name, resultString );
 
    cpu_dswrite( _environment, result->realName );
    
    Variable * address = variable_temporary( _environment, VT_ADDRESS, "(address of DSTRING)");
    Variable * size = variable_temporary( _environment, VT_BYTE, "(size of DSTRING)");
    cpu_dsdescriptor( _environment, result->realName, address->realName, size->realName );
 
    cpu_move_8bit_indirect_with_offset(_environment, x->realName, address->realName, 1 );
    cpu_move_8bit_indirect_with_offset(_environment, y->realName, address->realName, 2 );
        
    return result;
 
}