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raw.io
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1997-02-05
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4KB
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179 lines
/*
* TTY setup routines. These are the TERMIO-style (System V) routines.
*/
static struct termio _raw_tty, _original_tty;
/*
* current raw state
*/
static short _inraw = 0;
/*
* Set up the tty driver
*
* Args: state -- which state to put it in. 1 means go into raw (cbreak),
* 0 out of raw.
*
* Result: returns 0 if successful and -1 if not.
*/
int
Raw(state)
int state;
{
/** state is either ON or OFF, as indicated by call **/
/* Check return code only on first call. If it fails we're done for and
if it goes OK the others will probably go OK too. */
if(state == 0 && _inraw){
/*----- restore state to original -----*/
if(ioctl(STDIN_FD, TCSETAW, &_original_tty) < 0)
return(-1);
_inraw = 0;
}
else if(state == 1 && ! _inraw){
/*----- Go into raw mode (cbreak actually) ----*/
if(ioctl(STDIN_FD, TCGETA, &_original_tty) < 0)
return(-1);
(void)ioctl(STDIN_FD, TCGETA, &_raw_tty); /** again! **/
_raw_tty.c_lflag &= ~(ICANON | ECHO); /* noecho raw mode */
_raw_tty.c_lflag &= ~ISIG; /* disable signals */
_raw_tty.c_iflag &= ~ICRNL; /* turn off CR->NL on input */
_raw_tty.c_oflag &= ~ONLCR; /* turn off NL->CR on output */
_raw_tty.c_cc[VMIN] = 1; /* min # of chars to queue */
_raw_tty.c_cc[VTIME] = 0; /* min time to wait for input*/
_raw_tty.c_cc[VINTR] = ctrl('C'); /* make it our special char */
_raw_tty.c_cc[VQUIT] = 0;
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
_inraw = 1;
}
return(0);
}
/*
* Set up the tty driver to use XON/XOFF flow control
*
* Args: state -- True to make sure XON/XOFF turned on, FALSE off.
*
* Result: none.
*/
void
xonxoff_proc(state)
int state;
{
if(_inraw){
if(state){
if(!(_raw_tty.c_iflag & IXON)){
_raw_tty.c_iflag |= IXON; /* turn ON ^S/^Q on input */
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
}
}
else{
if(_raw_tty.c_iflag & IXON){
_raw_tty.c_iflag &= ~IXON; /* turn off ^S/^Q on input */
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
}
}
}
}
/*
* Set up the tty driver to do LF->CR translation
*
* Args: state -- True to turn on translation, false to write raw LF's
*
* Result: none.
*/
void
crlf_proc(state)
int state;
{
if(_inraw){
if(state){ /* turn ON NL->CR on output */
if(!(_raw_tty.c_oflag & ONLCR)){
_raw_tty.c_oflag |= ONLCR;
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
}
}
else{ /* turn OFF NL-CR on output */
if(_raw_tty.c_oflag & ONLCR){
_raw_tty.c_oflag &= ~ONLCR;
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
}
}
}
}
/*
* Set up the tty driver to hanle interrupt char
*
* Args: state -- True to turn on interrupt char, false to not
*
* Result: tty driver that'll send us SIGINT or not
*/
void
intr_proc(state)
int state;
{
if(_inraw){
if(state){
_raw_tty.c_lflag |= ISIG; /* enable signals */
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
}
else{
_raw_tty.c_lflag &= ~ISIG; /* disable signals */
(void)ioctl(STDIN_FD, TCSETAW, &_raw_tty);
}
}
}
/*
* Discard any pending input characters
*
* Args: none
*
* Result: pending input buffer flushed
*/
void
flush_input()
{
ioctl(STDIN_FD, TCFLSH, 0);
}
/*
* Turn off hi bit stripping
*/
void
bit_strip_off()
{
}
/*
* Turn off quit character (^\) if possible
*/
void
quit_char_off()
{
}
/*
* Returns TRUE if tty is < 4800, 0 otherwise.
*/
int
ttisslow()
{
return((_raw_tty.c_cflag&CBAUD) < (unsigned int)B4800);
}