path: root/tty.c

/* $Id: tty.c,v 1.122 2009-08-09 17:28:24 tcunha Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/ioctl.h>

#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include "tmux.h"

void	tty_fill_acs(struct tty *);

void	tty_raw(struct tty *, const char *);

int	tty_try_256(struct tty *, u_char, const char *);
int	tty_try_88(struct tty *, u_char, const char *);

void	tty_attributes(struct tty *, const struct grid_cell *);
void	tty_attributes_fg(struct tty *, const struct grid_cell *);
void	tty_attributes_bg(struct tty *, const struct grid_cell *);

void	tty_redraw_region(struct tty *, struct tty_ctx *);
void	tty_emulate_repeat(
	    struct tty *, enum tty_code_code, enum tty_code_code, u_int);
void	tty_cell(struct tty *,
    	    const struct grid_cell *, const struct grid_utf8 *);

void
tty_init(struct tty *tty, char *path, char *term)
{
	tty->path = xstrdup(path);
	if (term == NULL || *term == '\0')
		tty->termname = xstrdup("unknown");
	else
		tty->termname = xstrdup(term);
	tty->flags = 0;
	tty->term_flags = 0;
}

int
tty_open(struct tty *tty, const char *overrides, char **cause)
{
	int		 mode;

	tty->fd = open(tty->path, O_RDWR|O_NONBLOCK);
	if (tty->fd == -1) {
		xasprintf(cause, "%s: %s", tty->path, strerror(errno));
		return (-1);
	}

	if ((mode = fcntl(tty->fd, F_GETFL)) == -1)
		fatal("fcntl failed");
	if (fcntl(tty->fd, F_SETFL, mode|O_NONBLOCK) == -1)
		fatal("fcntl failed");
	if (fcntl(tty->fd, F_SETFD, FD_CLOEXEC) == -1)
		fatal("fcntl failed");

	if (debug_level > 3)
		tty->log_fd = open("tmux.out", O_WRONLY|O_CREAT|O_TRUNC, 0644);
	else
		tty->log_fd = -1;

	tty->term = tty_term_find(tty->termname, tty->fd, overrides, cause);
	if (tty->term == NULL)
		goto error;

	tty->in = buffer_create(BUFSIZ);
	tty->out = buffer_create(BUFSIZ);

	tty->flags &= TTY_UTF8;

	tty_start_tty(tty);

	tty_keys_init(tty);

	tty_fill_acs(tty);

	return (0);

error:
	close(tty->fd);
	tty->fd = -1;

	return (-1);
}

void
tty_start_tty(struct tty *tty)
{
	struct termios	 tio;
#ifdef TIOCFLUSH
	int		 what;
#endif

#if 0
	tty_detect_utf8(tty);
#endif

	if (tcgetattr(tty->fd, &tty->tio) != 0)
		fatal("tcgetattr failed");
	memcpy(&tio, &tty->tio, sizeof tio);
	tio.c_iflag &= ~(IXON|IXOFF|ICRNL|INLCR|IGNCR|IMAXBEL|ISTRIP);
	tio.c_iflag |= IGNBRK;
	tio.c_oflag &= ~(OPOST|ONLCR|OCRNL|ONLRET);
	tio.c_lflag &= ~(IEXTEN|ICANON|ECHO|ECHOE|ECHONL|ECHOCTL|
	    ECHOPRT|ECHOKE|ECHOCTL|ISIG);
	tio.c_cc[VMIN] = 1;
        tio.c_cc[VTIME] = 0;
	if (tcsetattr(tty->fd, TCSANOW, &tio) != 0)
		fatal("tcsetattr failed");

#ifdef TIOCFLUSH
	what = 0;
	if (ioctl(tty->fd, TIOCFLUSH, &what) != 0)
		fatal("ioctl(TIOCFLUSH)");
#endif

	tty_putcode(tty, TTYC_SMCUP);

	tty_putcode(tty, TTYC_SMKX);
	tty_putcode(tty, TTYC_ENACS);
	tty_putcode(tty, TTYC_CLEAR);

	tty_putcode(tty, TTYC_CNORM);
	if (tty_term_has(tty->term, TTYC_KMOUS))
		tty_puts(tty, "\033[?1000l");

	memcpy(&tty->cell, &grid_default_cell, sizeof tty->cell);

	tty->cx = UINT_MAX;
	tty->cy = UINT_MAX;

	tty->rlower = UINT_MAX;
	tty->rupper = UINT_MAX;

	tty->mode = MODE_CURSOR;
}

void
tty_stop_tty(struct tty *tty)
{
	struct winsize	ws;

	/*
	 * Be flexible about error handling and try not kill the server just
	 * because the fd is invalid. Things like ssh -t can easily leave us
	 * with a dead tty.
	 */
	if (ioctl(tty->fd, TIOCGWINSZ, &ws) == -1)
		return;
	if (tcsetattr(tty->fd, TCSANOW, &tty->tio) == -1)
		return;

	tty_raw(tty, tty_term_string2(tty->term, TTYC_CSR, 0, ws.ws_row - 1));
	tty_raw(tty, tty_term_string(tty->term, TTYC_RMACS));
	tty_raw(tty, tty_term_string(tty->term, TTYC_SGR0));
	tty_raw(tty, tty_term_string(tty->term, TTYC_RMKX));
	tty_raw(tty, tty_term_string(tty->term, TTYC_CLEAR));

	tty_raw(tty, tty_term_string(tty->term, TTYC_CNORM));
	if (tty_term_has(tty->term, TTYC_KMOUS))
		tty_raw(tty, "\033[?1000l");

	tty_raw(tty, tty_term_string(tty->term, TTYC_RMCUP));
}

#if 0
void
tty_detect_utf8(struct tty *tty)
{
	struct pollfd	pfd;
	char	      	buf[7];
	size_t		len;
	ssize_t		n;
	int		nfds;
	struct termios	tio, old_tio;
#ifdef TIOCFLUSH
	int		 what;
#endif

	if (tty->flags & TTY_UTF8)
		return;

	/*
	 * If the terminal looks reasonably likely to support this, try to
	 * write a three-byte UTF-8 wide character to the terminal, then read
	 * the cursor position.
	 *
	 * XXX This entire function is a hack.
	 */

	/* Check if the terminal looks sort of vt100. */
	if (strstr(tty_term_string(tty->term, TTYC_CLEAR), "[2J") == NULL ||
	    strstr(tty_term_string(tty->term, TTYC_CUP), "H") == NULL)
		return;

	if (tcgetattr(tty