input_string.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
 * "COSÌ COM'È", SENZA GARANZIE O CONDIZIONI DI ALCUN TIPO, esplicite o
 * 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 
 ****************************************************************************/
 
extern char DATATYPE_AS_STRING[][16];
 
Variable * input_string( Environment * _environment, char * _size ) {
 
    MAKE_LABEL
    
    char repeatLabel[MAX_TEMPORARY_STORAGE]; sprintf(repeatLabel, "%srepeat", label );
 
    Variable * result = variable_temporary( _environment, VT_DSTRING, "(result of INPUT$)");
    Variable * offset = variable_temporary( _environment, VT_BYTE, "(offset inside INPUT$)");
    Variable * address = variable_temporary( _environment, VT_ADDRESS, "(address of result of INPUT$)");
    Variable * size = variable_retrieve_or_define( _environment, _size, VT_BYTE, 0 );
    Variable * pressed = variable_temporary( _environment, VT_BYTE, "(key pressed?)");
    Variable * key = variable_temporary( _environment, VT_CHAR, "(key pressed)");
 
    cpu_dsfree( _environment, result->realName );
    cpu_dsalloc( _environment, size->realName, result->realName );
    cpu_dsdescriptor( _environment, result->realName, address->realName, pressed->realName );
 
    cpu_store_8bit( _environment, offset->realName, 0 );
 
    cpu_label( _environment, repeatLabel );
 
    cpc_inkey( _environment, key->realName );
 
    cpu_bveq( _environment, key->realName, repeatLabel );
 
    cpu_move_8bit_indirect_with_offset2( _environment, key->realName, address->realName, offset->realName );
 
    cpu_inc( _environment, offset->realName );
 
    cpu_compare_8bit( _environment, offset->realName, size->realName, pressed->realName, 1 );
 
    cpu_bveq( _environment, pressed->realName, repeatLabel );
 
    return result;
 
}