tmate/local.c

/* $Id: local.c,v 1.23 2007-11-26 20:36:30 nicm 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 <sys/stat.h>

#include <curses.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#define TTYDEFCHARS
/* glibc requires unistd.h before termios.h for TTYDEFCHARS. */
#include <unistd.h>	
#include <termios.h>
#include <term.h>

#include "tmux.h"

/*
 * Functions to translate input and write output to the local client terminal.
 * This file should probably be called tty or terminal.c.
 */

int	local_cmp(const void *, const void *);
int	local_putc(int);
void	local_putp(const char *);
void	local_attributes(u_char, u_char);
u_char	local_translate_acs(u_char);

/* Local key types and key codes. */
struct local_key {
	const char	*name;
	char		*string;
	size_t		 size;
	int	 	 code;
};
struct local_key local_keys[] = {
	{ "ka1",   NULL, 0, KEYC_A1 },
	{ "ka3",   NULL, 0, KEYC_A3 },
	{ "kb2",   NULL, 0, KEYC_B2 },
	{ "kbeg",  NULL, 0, KEYC_BEG },
	{ "kcbt",  NULL, 0, KEYC_BTAB },
	{ "kc1",   NULL, 0, KEYC_C1 },
	{ "kc3",   NULL, 0, KEYC_C3 },
	{ "kcan",  NULL, 0, KEYC_CANCEL },
	{ "ktbc",  NULL, 0, KEYC_CATAB },
	{ "kclr",  NULL, 0, KEYC_CLEAR },
	{ "kclo",  NULL, 0, KEYC_CLOSE },
	{ "kcmd",  NULL, 0, KEYC_COMMAND },
	{ "kcpy",  NULL, 0, KEYC_COPY },
	{ "kcrt",  NULL, 0, KEYC_CREATE },
	{ "kctab", NULL, 0, KEYC_CTAB },
	{ "kdch1", NULL, 0, KEYC_DC },
	{ "kdl1",  NULL, 0, KEYC_DL },
	{ "kcud1", NULL, 0, KEYC_DOWN },
	{ "krmir", NULL, 0, KEYC_EIC },
	{ "kend",  NULL, 0, KEYC_END },
	{ "kent",  NULL, 0, KEYC_ENTER },
	{ "kel",   NULL, 0, KEYC_EOL },
	{ "ked",   NULL, 0, KEYC_EOS },
	{ "kext",  NULL, 0, KEYC_EXIT },
	{ "kf0",   NULL, 0, KEYC_F0 },
	{ "kf1",   NULL, 0, KEYC_F1 },
	{ "kf10",  NULL, 0, KEYC_F10 },
	{ "kf11",  NULL, 0, KEYC_F11 },
	{ "kf12",  NULL, 0, KEYC_F12 },
	{ "kf13",  NULL, 0, KEYC_F13 },
	{ "kf14",  NULL, 0, KEYC_F14 },
	{ "kf15",  NULL, 0, KEYC_F15 },
	{ "kf16",  NULL, 0, KEYC_F16 },
	{ "kf17",  NULL, 0, KEYC_F17 },
	{ "kf18",  NULL, 0, KEYC_F18 },
	{ "kf19",  NULL, 0, KEYC_F19 },
	{ "kf2",   NULL, 0, KEYC_F2 },
	{ "kf20",  NULL, 0, KEYC_F20 },
	{ "kf21",  NULL, 0, KEYC_F21 },
	{ "kf22",  NULL, 0, KEYC_F22 },
	{ "kf23",  NULL, 0, KEYC_F23 },
	{ "kf24",  NULL, 0, KEYC_F24 },
	{ "kf25",  NULL, 0, KEYC_F25 },
	{ "kf26",  NULL, 0, KEYC_F26 },
	{ "kf27",  NULL, 0, KEYC_F27 },
	{ "kf28",  NULL, 0, KEYC_F28 },
	{ "kf29",  NULL, 0, KEYC_F29 },
	{ "kf3",   NULL, 0, KEYC_F3 },
	{ "kf30",  NULL, 0, KEYC_F30 },
	{ "kf31",  NULL, 0, KEYC_F31 },
	{ "kf32",  NULL, 0, KEYC_F32 },
	{ "kf33",  NULL, 0, KEYC_F33 },
	{ "kf34",  NULL, 0, KEYC_F34 },
	{ "kf35",  NULL, 0, KEYC_F35 },
	{ "kf36",  NULL, 0, KEYC_F36 },
	{ "kf37",  NULL, 0, KEYC_F37 },
	{ "kf38",  NULL, 0, KEYC_F38 },
	{ "kf39",  NULL, 0, KEYC_F39 },
	{ "kf4",   NULL, 0, KEYC_F4 },
	{ "kf40",  NULL, 0, KEYC_F40 },
	{ "kf41",  NULL, 0, KEYC_F41 },
	{ "kf42",  NULL, 0, KEYC_F42 },
	{ "kf43",  NULL, 0, KEYC_F43 },
	{ "kf44",  NULL, 0, KEYC_F44 },
	{ "kf45",  NULL, 0, KEYC_F45 },
	{ "kf46",  NULL, 0, KEYC_F46 },
	{ "kf47",  NULL, 0, KEYC_F47 },
	{ "kf48",  NULL, 0, KEYC_F48 },
	{ "kf49",  NULL, 0, KEYC_F49 },
	{ "kf5",   NULL, 0, KEYC_F5 },
	{ "kf50",  NULL, 0, KEYC_F50 },
	{ "kf51",  NULL, 0, KEYC_F51 },
	{ "kf52",  NULL, 0, KEYC_F52 },
	{ "kf53",  NULL, 0, KEYC_F53 },
	{ "kf54",  NULL, 0, KEYC_F54 },
	{ "kf55",  NULL, 0, KEYC_F55 },
	{ "kf56",  NULL, 0, KEYC_F56 },
	{ "kf57",  NULL, 0, KEYC_F57 },
	{ "kf58",  NULL, 0, KEYC_F58 },
	{ "kf59",  NULL, 0, KEYC_F59 },
	{ "kf6",   NULL, 0, KEYC_F6 },
	{ "kf60",  NULL, 0, KEYC_F60 },
	{ "kf61",  NULL, 0, KEYC_F61 },
	{ "kf62",  NULL, 0, KEYC_F62 },
	{ "kf63",  NULL, 0, KEYC_F63 },
	{ "kf7",   NULL, 0, KEYC_F7 },
	{ "kf8",   NULL, 0, KEYC_F8 },
	{ "kf9",   NULL, 0, KEYC_F9 },
	{ "kfnd",  NULL, 0, KEYC_FIND },
	{ "khlp",  NULL, 0, KEYC_HELP },
	{ "khome", NULL, 0, KEYC_HOME },
	{ "kich1", NULL, 0, KEYC_IC },
	{ "kil1",  NULL, 0, KEYC_IL },
	{ "kcub1", NULL, 0, KEYC_LEFT },
	{ "kll",   NULL, 0, KEYC_LL },
	{ "kmrk",  NULL, 0, KEYC_MARK },
	{ "kmsg",  NULL, 0, KEYC_MESSAGE },
	{ "kmov",  NULL, 0, KEYC_MOVE },
	{ "knxt",  NULL, 0, KEYC_NEXT },
	{ "knp",   NULL, 0, KEYC_NPAGE },
	{ "kopn",  NULL, 0, KEYC_OPEN },
	{ "kopt",  NULL, 0, KEYC_OPTIONS },
	{ "kpp",   NULL, 0, KEYC_PPAGE },
	{ "kprv",  NULL, 0, KEYC_PREVIOUS },
	{ "kprt",  NULL, 0, KEYC_PRINT },
	{ "krdo",  NULL, 0, KEYC_REDO },
	{ "kref",  NULL, 0, KEYC_REFERENCE },
	{ "krfr",  NULL, 0, KEYC_REFRESH },
	{ "krpl",  NULL, 0, KEYC_REPLACE },
	{ "krst",  NULL, 0, KEYC_RESTART },
	{ "kres",  NULL, 0, KEYC_RESUME },
	{ "kcuf1", NULL, 0, KEYC_RIGHT },
	{ "ksav",  NULL, 0, KEYC_SAVE },
	{ "kBEG",  NULL, 0, KEYC_SBEG },
	{ "kCAN",  NULL, 0, KEYC_SCANCEL },
	{ "kCMD",  NULL, 0, KEYC_SCOMMAND },
	{ "kCPY",  NULL, 0, KEYC_SCOPY },
	{ "kCRT",  NULL, 0, KEYC_SCREATE },
	{ "kDC",   NULL, 0, KEYC_SDC },
	{ "kDL",   NULL, 0, KEYC_SDL },
	{ "kslt",  NULL, 0, KEYC_SELECT },
	{ "kEND",  NULL, 0, KEYC_SEND },
	{ "kEOL",  NULL, 0, KEYC_SEOL },
	{ "kEXT",  NULL, 0, KEYC_SEXIT },
	{ "kind",  NULL, 0, KEYC_SF },
	{ "kFND",  NULL, 0, KEYC_SFIND },
	{ "kHLP",  NULL, 0, KEYC_SHELP },
	{ "kHOM",  NULL, 0, KEYC_SHOME },
	{ "kIC",   NULL, 0, KEYC_SIC },
	{ "kLFT",  NULL, 0, KEYC_SLEFT },
	{ "kMSG",  NULL, 0, KEYC_SMESSAGE },
	{ "kMOV",  NULL, 0, KEYC_SMOVE },
	{ "kNXT",  NULL, 0, KEYC_SNEXT },
	{ "kOPT",  NULL, 0, KEYC_SOPTIONS },
	{ "kPRV",  NULL, 0, KEYC_SPREVIOUS },
	{ "kPRT",  NULL, 0, KEYC_SPRINT },
	{ "kri",   NULL, 0, KEYC_SR },
	{ "kRDO",  NULL, 0, KEYC_SREDO },
	{ "kRPL",  NULL, 0, KEYC_SREPLACE },
	{ "kRIT",  NULL, 0, KEYC_SRIGHT },
	{ "kRES",  NULL, 0, KEYC_SRSUME },
	{ "kSAV",  NULL, 0, KEYC_SSAVE },
	{ "kSPD",  NULL, 0, KEYC_SSUSPEND },
	{ "khts",  NULL, 0, KEYC_STAB },
	{ "kUND",  NULL, 0, KEYC_SUNDO },
	{ "kspd",  NULL, 0, KEYC_SUSPEND },
	{ "kund",  NULL, 0, KEYC_UNDO },
	{ "kcuu1", NULL, 0, KEYC_UP },
	{ "pmous", NULL, 0, KEYC_MOUSE },
	{ NULL,    NULL, 0, KEYC_NONE }
};

/* tty file descriptor and local terminal buffers. */
int		 local_fd = -1;
int		 local_log = -1;
struct buffer	*local_in;
struct buffer	*local_out;
struct termios	 local_tio;
u_char		 local_attr;
u_char		 local_colr;

/* Initialise local terminal. */
int
local_init(struct buffer **in, struct buffer **out)
{
	char		       *tty, *path;
	const char	       *name;
	int		  	mode, error;
	struct termios	  	tio;
	struct local_key       *lk;
	u_int			i, j;
	static const char *const reqd[] = {
		"carriage_return",
		"change_scroll_region",
		"clear_screen",
		"clr_bol",
		"clr_eol",
		"cursor_address",
		"cursor_left",
		"cursor_down",
		"parm_dch",
		"parm_delete_line",
		"parm_down_cursor",
		"parm_ich",
		"parm_insert_line",
		"parm_left_cursor",
		"parm_right_cursor",
		"parm_up_cursor",
		"scroll_reverse",
		NULL
	};

	if ((tty = ttyname(STDIN_FILENO)) == NULL)
		fatal("ttyname failed");
	if ((local_fd = open(tty, O_RDWR)) == -1)
		fatal("open failed");
	if ((mode = fcntl(local_fd, F_GETFL)) == -1)
		fatal("fcntl failed");
	if (fcntl(local_fd, F_SETFL, mode|O_NONBLOCK) == -1)
		fatal("fcntl failed");

	if ((name = getenv("TERM")) == NULL || *name == '\0')
		name = "unknown";
	if (newterm(name, stdout, stdin) == NULL) {
		log_warnx("error opening terminal: %s", name);
		return (-1);
	}
	for (i = 0; reqd[i] != NULL; i++) {
		error = 0;

		for (j = 0; strfnames[j] != NULL; j++) {
			if (strcmp(strfnames[j], reqd[i]) == 0) {
				if (strcodes[j] == NULL)
					error = -1;
				break;
			}
		}
		if (error != -1) {
			for (j = 0; numfnames[j] != NULL; j++) {
				if (strcmp(numfnames[j], reqd[i]) == 0) {
					if (numcodes[j] == NULL)
						error = -1;
					break;
				}
			}
		}
		if (error != -1) {
			for (j = 0; boolfnames[j] != NULL; j++) {
				if (strcmp(boolfnames[j], reqd[i]) == 0) {
					if (boolcodes[j] == NULL)
						error = -1;
					break;
				}
			}
		}

		if (error == -1) {
			log_warnx("required capability missing: %s", reqd[i]);
			return (-1);
		}
	}
	
	*in = local_in = buffer_create(BUFSIZ);
	*out = local_out = buffer_create(BUFSIZ);

	if (tcgetattr(local_fd, &local_tio) != 0)
		fatal("tcgetattr failed");
	memset(&tio, 0, sizeof tio);
	tio.c_iflag = TTYDEF_IFLAG & ~(IXON|IXOFF|ICRNL|INLCR);
	tio.c_oflag = TTYDEF_OFLAG & ~(OPOST|ONLCR|OCRNL|ONLRET);
	tio.c_lflag = 
	    TTYDEF_LFLAG & ~(IEXTEN|ICANON|ECHO|ECHOE|ECHOKE|ECHOCTL|ISIG);
	tio.c_cflag = TTYDEF_CFLAG;
	memcpy(&tio.c_cc, ttydefchars, sizeof tio.c_cc);
	cfsetspeed(&tio, TTYDEF_SPEED);
	if (tcsetattr(local_fd, TCSANOW, &tio) != 0)
		fatal("tcsetattr failed");

	if (enter_ca_mode != NULL)
		local_putp(enter_ca_mode);
	if (keypad_xmit != NULL)
		local_putp(keypad_xmit);
	if (ena_acs != NULL)
		local_putp(ena_acs);
	local_putp(clear_screen);

	for (lk = local_keys; lk->name != NULL; lk++) {
		lk->string = tigetstr(lk->name);
		if (lk->string == (char *) -1 || lk->string == (char *) 0)
			lk->string = NULL;
		else {
			lk->size = strlen(lk->string);
			log_debug("string for %s (%d): \"%s\", length %zu",
			    lk->name, lk->code, lk->string, lk->size);
		}
	}
	qsort(local_keys, sizeof local_keys /
	    sizeof local_keys[0], sizeof local_keys[0], local_cmp);

	local_attr = 0;
	local_colr = 0x88;

	if (debug_level > 2) {
		xasprintf(
		    &path, "%s-output-%ld.log", __progname,(long) getpid());
		local_log = open(
		    path, O_RDWR|O_APPEND|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
		xfree(path);
	}

	return (local_fd);
}

/* Compare keys. */
int
local_cmp(const void *ptr1, const void *ptr2)
{
	const struct local_key *lk1 = ptr1, *lk2 = ptr2;

	if (lk1->string == NULL && lk2->string == NULL)
		return (0);
	if (lk1->string == NULL)
		return (1);
	if (lk2->string == NULL)
		return (-1);
	return (lk2->size - lk1->size);
}

/* Tidy up and reset local terminal. */
void
local_done(void)
{
	struct winsize	ws;

	buffer_destroy(local_in);
	buffer_destroy(local_out);

	if (tcsetattr(local_fd, TCSANOW, &local_tio) != 0)
		fatal("tcsetattr failed");
	close(local_fd);

	if (local_log != -1)
		close(local_log);
	
	if (change_scroll_region != NULL) {
		if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
			fatal("ioctl(TIOCGWINSZ)");
		putp(tparm(change_scroll_region, 0, ws.ws_row - 1));
	}

	endwin();
	if (keypad_local != NULL)
		putp(keypad_local);	/* not local_putp */
	if (exit_ca_mode != NULL)
		putp(exit_ca_mode);
	putp(clear_screen);
	if (cursor_normal != NULL)
		putp(cursor_normal);
	if (exit_attribute_mode != NULL)
		putp(exit_attribute_mode);
}

/* Put a character. Used as parameter to tputs. */
int
local_putc(int c)
{
	u_char	ch = c;

	if (c < 0 || c > (int) UCHAR_MAX)
		fatalx("invalid character");

	if (local_log != -1)
		write(local_log, &ch, 1);
	if (acs_chars != NULL && local_attr & ATTR_DRAWING) {
		ch = local_translate_acs(ch);
		if (ch == '\0')
			ch = '?';
	}

	buffer_write(local_out, &ch, 1);
	return (c);
}

/* Put terminfo string. */
void
local_putp(const char *s)
{
	if (s == NULL)
		fatalx("null pointer");

	tputs(s, 1, local_putc);
}

/* Return waiting keys if any. */
int
local_key(void)
{
	struct local_key	*lk;
	u_int			 i;
	size_t			 size;

	size = BUFFER_USED(local_in);
	if (size == 0)
		return (KEYC_NONE);

	i = 0;
	lk = local_keys;
	while (lk->string != NULL) {
		if (strncmp(BUFFER_OUT(local_in), lk->string, size) == 0) {
			if (size < lk->size)
				return (KEYC_NONE);
			log_debug("got key: "
			    "%s %d \"%s\"", lk->name, lk->code, lk->string);
			buffer_remove(local_in, lk->size);
			return (lk->code);
		}

		i++;
		lk = local_keys + i;
	}

	return (input_extract8(local_in));
}

/* Display output data. */
void
local_output(struct buffer *b, size_t size)
{
	u_char		 ch;
	uint16_t	 ua, ub;

	while (size != 0) {
		if (size < 1)
			break;
		size--;
		ch = input_extract8(b);
		if (ch != '\e') {
			switch (ch) {
			case '\n':	/* LF */
				local_putp(cursor_down);
				break;
			case '\r':	/* CR */
				local_putp(carriage_return);
				break;
			case '\007':	/* BEL */
				if (bell != NULL)
					local_putp(bell);
				break;
			case '\010':	/* BS */
				local_putp(cursor_left);
				break;
			default:
				local_putc(ch);
				break;
			}
			continue;
		}

		if (size < 1)
			fatalx("underflow");
		size--;
		ch = input_extract8(b);

		log_debug("received code %hhu", ch);
		switch (ch) {
		case CODE_CURSORUP:
			if (size < 2)
				fatalx("CODE_CURSORUP underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_up_cursor, ua));
			break;
		case CODE_CURSORDOWN:
			if (size < 2)
				fatalx("CODE_CURSORDOWN underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_down_cursor, ua));
			break;
		case CODE_CURSORRIGHT:
			if (size < 2)
				fatalx("CODE_CURSORRIGHT underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_right_cursor, ua));
			break;
		case CODE_CURSORLEFT:
			if (size < 2)
				fatalx("CODE_CURSORLEFT underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_left_cursor, ua));
			break;
		case CODE_CURSORMOVE:
			if (size < 4)
				fatalx("CODE_CURSORMOVE underflow");
			size -= 4;
			ua = input_extract16(b);
			ub = input_extract16(b);
			local_putp(tparm(cursor_address, ua - 1, ub - 1));
			break;
		case CODE_CLEARENDOFLINE:
			local_putp(clr_eol);
			break;
		case CODE_CLEARSTARTOFLINE:
			local_putp(clr_bol);
			break;
		case CODE_CLEARLINE:
			local_putp(clr_eol);	/* XXX */
			break;
		case CODE_INSERTLINE:
			if (size < 2)
				fatalx("CODE_INSERTLINE underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_insert_line, ua));
			break;
		case CODE_DELETELINE:
			if (size < 2)
				fatalx("CODE_DELETELINE underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_delete_line, ua));
			break;
		case CODE_INSERTCHARACTER:
			if (size < 2)
				fatalx("CODE_INSERTCHARACTER underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_ich, ua));
			break;
		case CODE_DELETECHARACTER:
			if (size < 2)
				fatalx("CODE_DELETECHARACTER underflow");
			size -= 2;
			ua = input_extract16(b);
			local_putp(tparm(parm_dch, ua));
			break;
		case CODE_CURSORON:
			if (cursor_normal != NULL)
				local_putp(cursor_normal);
			break;
		case CODE_CURSOROFF:
			if (cursor_invisible != NULL)
				local_putp(cursor_invisible);
			break;
		case CODE_REVERSEINDEX:
			local_putp(scroll_reverse);
			break;
		case CODE_SCROLLREGION:
			if (size < 4)
				fatalx("CODE_SCROLLREGION underflow");
			size -= 4;
			ua = input_extract16(b);
			ub = input_extract16(b);
			local_putp(tparm(change_scroll_region, ua - 1, ub - 1));
			break;
		case CODE_INSERTON:
			if (enter_insert_mode != NULL)
				local_putp(enter_insert_mode);
			break;
		case CODE_INSERTOFF:
			if (exit_insert_mode != NULL)
				local_putp(exit_insert_mode);
			break;
		case CODE_KCURSOROFF:
			/*
			t = tigetstr("CE");
			if (t != (char *) 0 && t != (char *) -1)
				local_putp(t);
			*/
			break;
		case CODE_KCURSORON:
			/*
			t = tigetstr("CS");
			if (t != (char *) 0 && t != (char *) -1)
				local_putp(t);
			*/
			break;
		case CODE_KKEYPADOFF:
			/*
			  if (keypad_local != NULL)
			  local_putp(keypad_local);
			*/
			break;
		case CODE_KKEYPADON:
			/*
			  if (keypad_xmit != NULL)
			  local_putp(keypad_xmit);
			*/
			break;
		case CODE_TITLE:
			if (size < 2)
				fatalx("CODE_TITLE underflow");
			size -= 2;
			ua = input_extract16(b);

			if (size < ua)
				fatalx("CODE_TITLE underflow");
			size -= ua;
			buffer_remove(b, ua);
			break;
		case CODE_ATTRIBUTES:
			if (size < 4)
				fatalx("CODE_ATTRIBUTES underflow");
			size -= 4;
			ua = input_extract16(b);
			ub = input_extract16(b);

			local_attributes(ua, ub);
			break;
		}
	}
}

void
local_attributes(u_char attr, u_char colr)
{
	u_char	fg, bg;

	if (attr == local_attr && colr == local_colr)
		return;

	/* If any bits are being cleared, reset everything. */
	if (local_attr & ~attr) {
		if ((local_attr & ATTR_DRAWING) &&
		    exit_alt_charset_mode != NULL)
			local_putp(exit_alt_charset_mode);
		local_putp(exit_attribute_mode);
		local_colr = 0x88;
		local_attr = 0;
	}

	/* Filter out bits already set. */
	attr &= ~local_attr;
	local_attr |= attr;

	if ((attr & ATTR_BRIGHT) && enter_bold_mode != NULL)
		local_putp(enter_bold_mode);
	if ((attr & ATTR_DIM) && enter_dim_mode != NULL)
		local_putp(enter_dim_mode);
	if ((attr & ATTR_ITALICS) && enter_standout_mode != NULL)
		local_putp(enter_standout_mode);
	if ((attr & ATTR_UNDERSCORE) && enter_underline_mode != NULL)
		local_putp(enter_underline_mode);
	if ((attr & ATTR_BLINK) && enter_blink_mode != NULL)
		local_putp(enter_blink_mode);
	if ((attr & ATTR_REVERSE) && enter_reverse_mode != NULL)
		local_putp(enter_reverse_mode);
	if ((attr & ATTR_HIDDEN) && enter_secure_mode != NULL)
		local_putp(enter_secure_mode);
	if ((attr & ATTR_DRAWING) && enter_alt_charset_mode != NULL)
		local_putp(enter_alt_charset_mode);

	fg = (colr >> 4) & 0xf;
	if (fg != ((local_colr >> 4) & 0xf)) {
		if (tigetflag("AX") == TRUE) {
			if (fg == 7)
				fg = 8;
		} else {
			if (fg == 8)
				fg = 7;
		}
		
		if (fg == 8)
			local_putp("\e[39m");
		else if (set_a_foreground != NULL)
			local_putp(tparm(set_a_foreground, fg));
	}
	
	bg = colr & 0xf;
	if (bg != (local_colr & 0xf)) {
		if (tigetflag("AX") == TRUE) {
			if (bg == 0)
				bg = 8;
		} else {
			if (bg == 8)
				bg = 0;
		}

		if (bg == 8)
			local_putp("\e[49m");
		else if (set_a_background != NULL)
			local_putp(tparm(set_a_background, bg));
	}

	local_colr = colr;
}

u_char
local_translate_acs(u_char ch)
{
	switch (ch) {
	case '~':
		return (ACS_BULLET);
	case '}':
		return (ACS_STERLING);
	case '|':
		return (ACS_NEQUAL);
	case '{':
		return (ACS_PI);
	case 'z':
		return (ACS_GEQUAL);
	case 'y':
		return (ACS_LEQUAL);
	case 'x':
		return (ACS_VLINE);
	case 'w':
		return (ACS_TTEE);
	case 'v':
		return (ACS_BTEE);
	case 'u':
		return (ACS_RTEE);
	case 't':
		return (ACS_LTEE);
	case 's':
		return (ACS_S9);
	case 'r':
		return (ACS_S7);
	case 'q':
		return (ACS_HLINE);
	case 'p':
		return (ACS_S3);
	case 'o':
		return (ACS_S1);
	case 'n':
		return (ACS_PLUS);
	case 'm':
		return (ACS_LLCORNER);
	case 'l':
		return (ACS_ULCORNER);
	case 'k':
		return (ACS_URCORNER);
	case 'j':
		return (ACS_LRCORNER);
	case 'i':
		return (ACS_LANTERN);
	case 'h':
		return (ACS_BOARD);
	case 'g':
		return (ACS_PLMINUS);
	case 'f':
		return (ACS_DEGREE);
	case 'a':
		return (ACS_CKBOARD);
	case '`':
		return (ACS_DIAMOND);
	case '0':
		return (ACS_BLOCK);
	case '.':
		return (ACS_DARROW);
	case '-':
		return (ACS_UARROW);
	case ',':
		return (ACS_LARROW);
	case '+':
		return (ACS_RARROW);
	}
	return (ch);
}