get_cmove.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.
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword CMOVE (function)
 
@english
 
The ''CMOVE$'' function can be used to generate a string that moves the text cursor a 
pre-set distance away from its current position. The command is followed by a pair 
of variables that represent the width and height of the required offset, and these 
values are added to the current cursor coordinates. Like ''LOCATE'', either of the
coordinates can be omitted, as long as the comma is positioned correctly. An additional 
technique is to use negative values as well as positive offsets.
 
@italian
 
The ''CMOVE$'' function can be used to generate a string that moves the text cursor
a preset distance from its current position. The command is followed by a pair of 
variables representing the width and height of the requested offset, and these values 
​​are added to the current cursor coordinates. Like ''LOCATE'', both coordinates can be 
omitted, as long as the comma is correctly positioned. Another technique is to use 
negative values ​​and positive offsets.
 
@syntax = CMOVE$( x, y )
 
@example PRINT CMOVE$(10,10)
 
@usedInExample texts_position_04.bas
 
@seeAlso CMOVE (instruction)
@target all
</usermanual> */
Variable * get_cmove( 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, "(get_cmove)" );
    Variable * address = variable_temporary( _environment, VT_ADDRESS, "(get_cmove)" );
    Variable * size = variable_temporary( _environment, VT_BYTE, "(get_cmove)" );
 
    char resultString[MAX_TEMPORARY_STORAGE]; sprintf( resultString, "\x3  " );
 
    variable_store_string(_environment, result->name, resultString );
    cpu_dswrite( _environment, result->realName );
    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;
 
}
 
Variable * get_cmove_direct( Environment * _environment, int _x, int _y ) {
    
    Variable * result = variable_temporary( _environment, VT_DSTRING, 0 );
    Variable * address = variable_temporary( _environment, VT_ADDRESS, "(get_cmove)" );
    Variable * size = variable_temporary( _environment, VT_BYTE, "(get_cmove)" );
 
    char resultString[MAX_TEMPORARY_STORAGE]; sprintf( resultString, "\x3  " );
 
    variable_store_string(_environment, result->name, resultString );
    cpu_dswrite( _environment, result->realName );
    cpu_dsdescriptor( _environment, result->realName, address->realName, size->realName );
 
    Variable * tmp = variable_temporary( _environment, VT_BYTE, "(get_cmove)" );
    cpu_store_8bit( _environment, tmp->realName, ( _x & 0xff ) );
    cpu_move_8bit_indirect_with_offset( _environment, tmp->realName, address->realName, 1 );
    cpu_store_8bit( _environment, tmp->realName, ( _y & 0xff ) );
    cpu_move_8bit_indirect_with_offset( _environment, tmp->realName, address->realName, 2 );
        
    return result;
 
}