/****************************************************************************** Product:  Quantum Calculator Example* Version:  Compatible with QEP/C 3.x.yy* Updated:  Oct 24, 2005** Copyright (C) 2002-2005 Quantum Leaps, LLC. All rights reserved.** This example is part of the Quantum Leaps QP/C software, and may be* distributed and modified under the terms of the GNU General Public License* version 2 (GPL) as published by the Free Software Foundation and appearing* in the file GPL.TXT included in the packaging of this file. Please note* that GPL Section 2[b] requires that all works based on this software must* also be made publicly available under the terms of the GPL ("Copyleft").** Alternatively, this software may be distributed and modified in conjunction* with a valid QP/C Quantum Leaps commercial license. Quantum Leaps* commercial licenses are designed for users who want to retain proprietary* status of their code. The users who license this software under one of* Quantum Leaps commercial licenses do not use this software under the GPL* and therefore are not subject to any of its terms.** Contact information:* Quantum Leaps Web site:  http://www.quantum-leaps.com* Quantum Leaps licensing: http://www.quantum-leaps.com/licensing* Quantum Leaps products:  http://www.quantum-leaps.com/products* e-mail:                  sales@quantum-leaps.com*****************************************************************************/#include "qep_port.h"#include "qcalc.h"#include "qassert.h"#include <termios.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <string.h>Q_DEFINE_THIS_FILE/* Local objects -----------------------------------------------------------*/static QCalc l_qcalc;      /* quantum calculator hierarchical state machine */struct termios l_saved;         /* structure with saved terminal attributes *//*..........................................................................*/int main() {    struct termios tio;                     /* modified terminal attributes */    tcgetattr(0, &l_saved);         /* save the current terminal attributes */    tcgetattr(0, &tio);              /* get the current terminal attributes */    tio.c_lflag &= ~ICANON;                       /* disable canonical mode */    tcsetattr(0, TCSANOW, &tio);                  /* set the new attributes */    QCalc_ctor(&l_qcalc);    printf("QCalc example, built on %s at %s,\n"           "QEP/C: %s.\nPress ESC to quit...\n",           __DATE__, __TIME__, QEP_getVersion());    QHsm_init((QHsm *)&l_qcalc, (QEvent *)0);      /* trigger initial tran. */    for (;;) {                                                /* event loop */        QCalcEvt e;        printf("\n[%s] >", QCalc_getDisplay(&l_qcalc)); /* show the display */        fflush(stdout);        read(0, &e.keyId, 1);        /* read one character from the console */        printf(": ");        fflush(stdout);        switch (e.keyId) {            case 'c':                         /* intentionally fall through */            case 'C': {                ((QEvent *)&e)->sig = C_SIG;                break;            }            case 'e':                         /* intentionally fall through */            case 'E': {                ((QEvent *)&e)->sig = CE_SIG;                break;            }            case '0': {                ((QEvent *)&e)->sig = DIGIT_0_SIG;                break;            }            case '1':                         /* intentionally fall through */            case '2':                         /* intentionally fall through */            case '3':                         /* intentionally fall through */            case '4':                         /* intentionally fall through */            case '5':                         /* intentionally fall through */            case '6':                         /* intentionally fall through */            case '7':                         /* intentionally fall through */            case '8':                         /* intentionally fall through */            case '9': {                ((QEvent *)&e)->sig = DIGIT_1_9_SIG;                break;            }            case '.': {                ((QEvent *)&e)->sig = POINT_SIG;                break;            }            case '+':                         /* intentionally fall through */            case '-':                         /* intentionally fall through */            case '*':                         /* intentionally fall through */            case '/': {                ((QEvent *)&e)->sig = OPER_SIG;                break;            }            case '=':                         /* intentionally fall through */            case '\r': {                                       /* Enter key */                ((QEvent *)&e)->sig = EQUALS_SIG;                break;            }            case '\33': {                                        /* ESC key */                ((QEvent *)&e)->sig = TERMINATE_SIG;                break;            }            default: {                ((QEvent *)&e)->sig = IGNORE_SIG;                break;            }        }        QHsm_dispatch((QHsm *)&l_qcalc, (QEvent *)&e);/* dispatch the event */    }    return 0;}/*..........................................................................*/void Q_assert_handler(char const *file, int line) {    fprintf(stderr, "Assertion failed in %s, line %d", file, line);    exit(-1);}/*..........................................................................*/void QCalc_updateState(QCalc *me, char const *s) {    (void)me;              /* suppress the "unreferenced parameter" warning */    printf("%s;", s);}/*..........................................................................*/void QCalc_exit(QCalc *me) {    (void)me;              /* suppress the "unreferenced parameter" warning */    printf("Bye, Bye!");    tcsetattr(0, TCSANOW, &l_saved);/*restore the saved terminal attributes */    exit(0);}