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/// @file
#include "c3/c3.h"
#include "noun.h"
#include "vere.h"
#include <sys/ioctl.h>
#include <termios.h>
/* u3_ptty: POSIX terminal extension to u3_utty.
*/
typedef struct {
u3_utty tty_u; // common tty structure
c3_i cug_i; // blocking fcntl flags
c3_i nob_i; // nonblocking fcntl flags
struct termios bak_u; // cooked terminal state
struct termios raw_u; // raw terminal state
} u3_ptty;
/* _term_tcsetattr(): tcsetattr w/retry on EINTR.
*/
static c3_i
_term_tcsetattr(c3_i fil_i, c3_i act_i, const struct termios* tms_u)
{
c3_i ret_i = 0;
c3_w len_w = 0;
do {
// abort pathological retry loop
//
if ( 100 == ++len_w ) {
fprintf(stderr, "term: tcsetattr loop: %s\r\n", strerror(errno));
return -1;
}
ret_i = tcsetattr(fil_i, act_i, tms_u);
} while ( (-1 == ret_i) && (EINTR == errno) );
return ret_i;
}
/* _ttyf_start_raw_input(): sets the tty to raw input.
*/
static c3_o
_ttyf_start_raw_input(u3_utty* uty_u)
{
u3_ptty* pty_u = (u3_ptty*)uty_u;
if ( 0 != _term_tcsetattr(uty_u->fid_i, TCSADRAIN, &pty_u->raw_u) ) {
return c3n;
}
if ( -1 == fcntl(uty_u->fid_i, F_SETFL, pty_u->nob_i) ) {
u3_assert(!"init-fcntl");
}
return c3y;
}
/* _ttyf_start_raw_input(): ends raw input on the tty.
*/
static c3_o
_ttyf_end_raw_input(u3_utty* uty_u)
{
u3_ptty* pty_u = (u3_ptty*)uty_u;
if ( 0 != _term_tcsetattr(uty_u->fid_i, TCSADRAIN, &pty_u->bak_u) ) {
return c3n;
}
if ( -1 == fcntl(uty_u->fid_i, F_SETFL, pty_u->cug_i) ) {
u3_assert(!"exit-fcntl");
}
return c3y;
}
/* _ttyf_hija(): hijacks the tty for cooked output.
*/
static c3_o
_ttyf_hija(u3_utty* uty_u)
{
u3_ptty* pty_u = (u3_ptty*)uty_u;
if ( 0 != _term_tcsetattr(1, TCSADRAIN, &pty_u->bak_u) ) {
perror("hija-tcsetattr-1");
u3_assert(!"hija-tcsetattr");
}
if ( -1 == fcntl(1, F_SETFL, pty_u->cug_i) ) {
perror("hija-fcntl-1");
u3_assert(!"hija-fcntl");
}
if ( 0 != _term_tcsetattr(0, TCSADRAIN, &pty_u->bak_u) ) {
perror("hija-tcsetattr-0");
u3_assert(!"hija-tcsetattr");
}
if ( -1 == fcntl(0, F_SETFL, pty_u->cug_i) ) {
perror("hija-fcntl-0");
u3_assert(!"hija-fcntl");
}
return c3y;
}
/* _ttyf_loja(): releases the tty from cooked output.
*/
static c3_o
_ttyf_loja(u3_utty* uty_u)
{
u3_ptty* pty_u = (u3_ptty*)uty_u;
if ( 0 != _term_tcsetattr(1, TCSADRAIN, &pty_u->raw_u) ) {
perror("loja-tcsetattr-1");
u3_assert(!"loja-tcsetattr");
}
if ( -1 == fcntl(1, F_SETFL, pty_u->nob_i) ) {
perror("hija-fcntl-1");
u3_assert(!"loja-fcntl");
}
if ( 0 != _term_tcsetattr(0, TCSADRAIN, &pty_u->raw_u) ) {
perror("loja-tcsetattr-0");
u3_assert(!"loja-tcsetattr");
}
if ( -1 == fcntl(0, F_SETFL, pty_u->nob_i) ) {
perror("hija-fcntl-0");
u3_assert(!"loja-fcntl");
}
return c3y;
}
/* _ttyf_get_winsize(): gets the tty window size.
*/
static c3_o
_ttyf_get_winsize(u3_utty* uty_u, c3_l* col_l, c3_l* row_l)
{
struct winsize siz_u;
if ( 0 == ioctl(uty_u->fid_i, TIOCGWINSZ, &siz_u) )
{
*col_l = siz_u.ws_col;
*row_l = siz_u.ws_row;
return c3y;
} else {
return c3n;
}
}
/* u3_ptty_init(): initialize platform-specific tty.
*/
u3_utty*
u3_ptty_init(uv_loop_t* lup_u, const c3_c** err_c)
{
u3_ptty* pty_u = c3_calloc(sizeof(u3_ptty));
u3_utty* uty_u = &pty_u->tty_u;
if ( !isatty(0) || !isatty(1) ) {
*err_c = "not a tty";
c3_free(pty_u);
return NULL;
}
uv_pipe_init(lup_u, &uty_u->pin_u.pip_u, 0);
uv_pipe_init(lup_u, &uty_u->pop_u.pip_u, 0);
uv_pipe_open(&uty_u->pin_u.pip_u, 0);
uv_pipe_open(&uty_u->pop_u.pip_u, 1);
// Load old terminal state to restore.
//
{
if ( 0 != tcgetattr(uty_u->fid_i, &pty_u->bak_u) ) {
u3_assert(!"init-tcgetattr");
}
if ( -1 == fcntl(uty_u->fid_i, F_GETFL, &pty_u->cug_i) ) {
u3_assert(!"init-fcntl");
}
pty_u->cug_i &= ~O_NONBLOCK; // could fix?
pty_u->nob_i = pty_u->cug_i | O_NONBLOCK; // O_NDELAY on older unix
}
// Construct raw termios configuration.
//
// makes input available per-character, does not echo input,
// disables special input pre-processing, output post-processing.
//
{
pty_u->raw_u = pty_u->bak_u;
pty_u->raw_u.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN);
pty_u->raw_u.c_iflag &= ~(ICRNL | INPCK | ISTRIP);
pty_u->raw_u.c_cflag &= ~(CSIZE | PARENB);
pty_u->raw_u.c_cflag |= CS8;
pty_u->raw_u.c_oflag &= ~(OPOST);
pty_u->raw_u.c_cc[VMIN] = 0;
pty_u->raw_u.c_cc[VTIME] = 0;
}
uty_u->fid_i = 1;
uty_u->sta_f = _ttyf_start_raw_input;
uty_u->sto_f = _ttyf_end_raw_input;
uty_u->hij_f = _ttyf_hija;
uty_u->loj_f = _ttyf_loja;
uty_u->wsz_f = _ttyf_get_winsize;
return uty_u;
}
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