conio.cpp

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#include <phua_haptic/conio.h>

int _kbhit()
{
    static int initialized;
        
    fd_set rfds;
    struct timeval tv;
    int retcode;
        
    if(!initialized)
    {
        if(tcgetattr(STDIN_FILENO, &term_attribs) < 0)
        {
            perror("tcgetattr: ");
            exit(-1);
        }

        term_attribs_old = term_attribs;

        if(atexit(restore_term))
        {
            perror("atexit: ");
            exit(-1);
        }

        term_attribs.c_lflag &= ~(ECHO | ICANON | ISIG | IEXTEN);
        term_attribs.c_iflag &= ~(IXON | BRKINT | INPCK | ICRNL | ISTRIP);
        term_attribs.c_cflag &= ~(CSIZE | PARENB);
        term_attribs.c_cflag |= CS8;
        term_attribs.c_cc[VTIME] = 0;
        term_attribs.c_cc[VMIN] = 0;

        if(tcsetattr(STDIN_FILENO, TCSANOW, &term_attribs) < 0)
        {
            perror("tcsetattr: ");
            exit(-1);
        }

        initialized = 1;
    }   

    FD_ZERO(&rfds);
    FD_SET(STDIN_FILENO, &rfds);
    memset(&tv, 0, sizeof(tv));
    
    retcode = select(1, &rfds, NULL, NULL, &tv);
    if(retcode == -1 && errno == EINTR)
    {
        return 0;
    }
    else if(retcode < 0)
    {
        perror("select: ");
        exit(-1);
    }
    else if(FD_ISSET(STDIN_FILENO, &rfds))
    {
        return retcode;
    }
        
    return 0;
}

int getch()
{
    fd_set rfds;
    int retcode;

    FD_ZERO(&rfds);
    FD_SET(STDIN_FILENO, &rfds);
    
    retcode = select(1, &rfds, NULL, NULL, NULL);
    if(retcode == -1 && errno == EINTR)
    {
        return 0;
    }
    else if(retcode < 0)
    {
        perror("select: ");
        exit(-1);
    }

    return getchar();
}