strptr.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");
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *----------------------------------------------------------------------------
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/
 
extern char DATATYPE_AS_STRING[][16];

/* <usermanual>
@keyword STRPTR
 
@english
This function allows you to retrieves the address 
in memory where the actual text of a given string is located.
 
@italian
Questa funzione consente di recuperare l'indirizzo di 
memoria in cui si trova il testo effettivo di una determinata stringa.
 
@syntax = STRPTR(var)
 
@example address = STRPTR(x)
 
</usermanual> */
Variable * strptr( Environment * _environment, char * _name ) {
 
    Variable * name = variable_retrieve( _environment, _name );
    Variable * size = variable_temporary( _environment, VT_BYTE, "(size of string)");
    Variable * result = variable_temporary( _environment, VT_ADDRESS, "(address)" );
 
    switch( name->type ) {
        case VT_STRING:
            cpu_move_8bit( _environment, name->realName, size->realName );
            cpu_addressof_16bit( _environment, name->realName, result->realName );
            cpu_inc_16bit( _environment, result->realName );
            break;
        case VT_DSTRING:
            cpu_dsdescriptor( _environment, name->realName, result->realName, size->realName );
            break;
        default:
            CRITICAL_STRPTR_NOT_STRING( _name, DATATYPE_AS_STRING[name->type] );
    }
 
    return result;
 
}