read_end.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 * read_end( Environment * _environment ) {
 
    _environment->dataNeeded = 1;
 
    MAKE_LABEL
 
    Variable * readEnd = variable_temporary( _environment, VT_BYTE, "(flag)" );
    
    outline0("LDD DATAPTR");
    outline0("SUBD #DATAPTRE");
    outline1("BEQ %send", label);
    outline1("CLR %s", readEnd->realName);
    outline1("JMP %sdone", label);
    outhead1("%send", label);
    outline0("LDA #$ff");
    outline1("STA %s", readEnd->realName);
    outhead1("%sdone", label);
 
    return readEnd;
 
}