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#![feature(libc)]

extern crate libc;
use self::libc::{c_int, c_uint, c_uchar};


#[allow(non_camel_case_types)]
pub type cc_t     = c_uchar;

#[allow(non_camel_case_types)]
pub type speed_t  = c_uint;

#[allow(non_camel_case_types)]
pub type tcflag_t = c_uint;


#[cfg(target_os = "linux")]
pub const NCCS: usize = 32; // per bits/termios.h


#[cfg(target_os = "linux")]
#[repr(C)]
#[derive(Clone, PartialEq, Eq)]
pub struct termios {
    pub c_iflag: tcflag_t, // input mode flags
    pub c_oflag: tcflag_t, // output mode flags
    pub c_cflag: tcflag_t, // control mode flags
    pub c_lflag: tcflag_t, // local mode flags

    pub c_line: cc_t,       // line discipline
    pub c_cc: [cc_t; NCCS], // control characters

    pub c_ispeed: speed_t, // input speed
    pub c_ospeed: speed_t, // output speed
}

impl termios {
    pub fn new() -> termios {
        use std::mem;
        unsafe { mem::zeroed() }
    }
}


// c_cc characters
pub const VINTR:    usize = 0;
pub const VQUIT:    usize = 1;
pub const VERASE:   usize = 2;
pub const VKILL:    usize = 3;
pub const VEOF:     usize = 4;
pub const VTIME:    usize = 5;
pub const VMIN:     usize = 6;
pub const VSWTC:    usize = 7;
pub const VSTART:   usize = 8;
pub const VSTOP:    usize = 9;
pub const VSUSP:    usize = 10;
pub const VEOL:     usize = 11;
pub const VREPRINT: usize = 12;
pub const VDISCARD: usize = 13;
pub const VWERASE:  usize = 14;
pub const VLNEXT:   usize = 15;
pub const VEOL2:    usize = 16;


// c_iflag bits
pub const IGNBRK:  tcflag_t = 0000001;
pub const BRKINT:  tcflag_t = 0000002;
pub const IGNPAR:  tcflag_t = 0000004;
pub const PARMRK:  tcflag_t = 0000010;
pub const INPCK:   tcflag_t = 0000020;
pub const ISTRIP:  tcflag_t = 0000040;
pub const INLCR:   tcflag_t = 0000100;
pub const IGNCR:   tcflag_t = 0000200;
pub const ICRNL:   tcflag_t = 0000400;
pub const IUCLC:   tcflag_t = 0001000;
pub const IXON:    tcflag_t = 0002000;
pub const IXANY:   tcflag_t = 0004000;
pub const IXOFF:   tcflag_t = 0010000;
pub const IMAXBEL: tcflag_t = 0020000;
pub const IUTF8:   tcflag_t = 0040000;


// c_oflag bits
pub const OPOST:  tcflag_t = 0000001;
pub const OLCUC:  tcflag_t = 0000002;
pub const ONLCR:  tcflag_t = 0000004;
pub const OCRNL:  tcflag_t = 0000010;
pub const ONOCR:  tcflag_t = 0000020;
pub const ONLRET: tcflag_t = 0000040;
pub const OFILL:  tcflag_t = 0000100;
pub const OFDEL:  tcflag_t = 0000200;
pub const NLDLY:  tcflag_t = 0000400;
pub const   NL0:  tcflag_t = 0000000;
pub const   NL1:  tcflag_t = 0000400;
pub const CRDLY:  tcflag_t = 0003000;
pub const   CR0:  tcflag_t = 0000000;
pub const   CR1:  tcflag_t = 0001000;
pub const   CR2:  tcflag_t = 0002000;
pub const   CR3:  tcflag_t = 0003000;
pub const TABDLY: tcflag_t = 0014000;
pub const   TAB0: tcflag_t = 0000000;
pub const   TAB1: tcflag_t = 0004000;
pub const   TAB2: tcflag_t = 0010000;
pub const   TAB3: tcflag_t = 0014000;
pub const BSDLY:  tcflag_t = 0020000;
pub const   BS0:  tcflag_t = 0000000;
pub const   BS1:  tcflag_t = 0020000;
pub const FFDLY:  tcflag_t = 0100000;
pub const   FF0:  tcflag_t = 0000000;
pub const   FF1:  tcflag_t = 0100000;
pub const VTDLY:  tcflag_t = 0040000;
pub const   VT0:  tcflag_t = 0000000;
pub const   VT1:  tcflag_t = 0040000;
pub const XTABS:  tcflag_t = 0014000;


// c_cflag bit meaning
pub const CBAUD:      tcflag_t = 0010017;
pub const  B0:        tcflag_t = 0000000; // hang up
pub const  B50:       tcflag_t = 0000001;
pub const  B75:       tcflag_t = 0000002;
pub const  B110:      tcflag_t = 0000003;
pub const  B134:      tcflag_t = 0000004;
pub const  B150:      tcflag_t = 0000005;
pub const  B200:      tcflag_t = 0000006;
pub const  B300:      tcflag_t = 0000007;
pub const  B600:      tcflag_t = 0000010;
pub const  B1200:     tcflag_t = 0000011;
pub const  B1800:     tcflag_t = 0000012;
pub const  B2400:     tcflag_t = 0000013;
pub const  B4800:     tcflag_t = 0000014;
pub const  B9600:     tcflag_t = 0000015;
pub const  B19200:    tcflag_t = 0000016;
pub const  B38400:    tcflag_t = 0000017;
pub const EXTA:       tcflag_t = B19200;
pub const EXTB:       tcflag_t = B38400;
pub const CSIZE:      tcflag_t = 0000060;
pub const   CS5:      tcflag_t = 0000000;
pub const   CS6:      tcflag_t = 0000020;
pub const   CS7:      tcflag_t = 0000040;
pub const   CS8:      tcflag_t = 0000060;
pub const CSTOPB:     tcflag_t = 0000100;
pub const CREAD:      tcflag_t = 0000200;
pub const PARENB:     tcflag_t = 0000400;
pub const PARODD:     tcflag_t = 0001000;
pub const HUPCL:      tcflag_t = 0002000;
pub const CLOCAL:     tcflag_t = 0004000;
pub const CBAUDEX:    tcflag_t = 0010000;
pub const  B57600:    tcflag_t = 0010001;
pub const  B115200:   tcflag_t = 0010002;
pub const  B230400:   tcflag_t = 0010003;
pub const  B460800:   tcflag_t = 0010004;
pub const  B500000:   tcflag_t = 0010005;
pub const  B576000:   tcflag_t = 0010006;
pub const  B921600:   tcflag_t = 0010007;
pub const  B1000000:  tcflag_t = 0010010;
pub const  B1152000:  tcflag_t = 0010011;
pub const  B1500000:  tcflag_t = 0010012;
pub const  B2000000:  tcflag_t = 0010013;
pub const  B2500000:  tcflag_t = 0010014;
pub const  B3000000:  tcflag_t = 0010015;
pub const  B3500000:  tcflag_t = 0010016;
pub const  B4000000:  tcflag_t = 0010017;
pub const __MAX_BAUD: tcflag_t = B4000000;

// TODO(bas): overflow is a bit conspicuous, but this is
// the value defined in my bits/termios.h...

#[allow(overflowing_literals)]
pub const CIBAUD:     tcflag_t = 002003600000; // input baud rate (not used)
#[allow(overflowing_literals)]
pub const CMSPAR:     tcflag_t = 010000000000; // mark or space (stick) parity
#[allow(overflowing_literals)]
pub const CRTSCTS:    tcflag_t = 020000000000; // flow control


// c_lflag bits
pub const ISIG:    tcflag_t = 0000001;
pub const ICANON:  tcflag_t = 0000002;
pub const XCASE:   tcflag_t = 0000004;
pub const ECHO:    tcflag_t = 0000010;
pub const ECHOE:   tcflag_t = 0000020;
pub const ECHOK:   tcflag_t = 0000040;
pub const ECHONL:  tcflag_t = 0000100;
pub const NOFLSH:  tcflag_t = 0000200;
pub const TOSTOP:  tcflag_t = 0000400;
pub const ECHOCTL: tcflag_t = 0001000;
pub const ECHOPRT: tcflag_t = 0002000;
pub const ECHOKE:  tcflag_t = 0004000;
pub const FLUSHO:  tcflag_t = 0010000;
pub const PENDIN:  tcflag_t = 0040000;
pub const IEXTEN:  tcflag_t = 0100000;
pub const EXTPROC: tcflag_t = 0200000;


// tcflow() and TCXONC use these
pub const TCOOFF:    c_int = 0;
pub const TCOON:     c_int = 1;
pub const TCIOFF:    c_int = 2;
pub const TCION:     c_int = 3;


// tcflush() and TCFLSH use these
pub const TCIFLUSH:  c_int = 0;
pub const TCOFLUSH:  c_int = 1;
pub const TCIOFLUSH: c_int = 2;


// tcsetattr uses these
pub const TCSANOW:   c_int = 0;
pub const TCSADRAIN: c_int = 1;
pub const TCSAFLUSH: c_int = 2;


extern "C" {
    pub fn tcgetattr(fd: c_int, tio: *mut termios) -> c_int;
    pub fn tcsetattr(fd: c_int, optional_actions: c_int,
                     tio: *const termios) -> c_int;

    pub fn tcsendbreak(fd: c_int, duration: c_int) -> c_int;
    pub fn tcdrain(fd: c_int) -> c_int;
    pub fn tcflush(fd: c_int, queue_selector: c_int) -> c_int;
    pub fn tcflow(fd: c_int, action: c_int) -> c_int;

    pub fn cfmakeraw(tio: *mut termios);

    pub fn cfgetispeed(tio: *const termios) -> speed_t;
    pub fn cfgetospeed(tio: *const termios) -> speed_t;
    pub fn cfsetispeed(tio: *mut termios, speed: speed_t) -> c_int;
    pub fn cfsetospeed(tio: *mut termios, speed: speed_t) -> c_int;
    pub fn cfsetspeed(tio: *mut termios, speed: speed_t) -> c_int;
}