tty-term.c - tmux - Rivoreo Source Code Repositories

 /* $Id: tty-term.c,v 1.28 2009-08-09 16:52:06 tcunha Exp $ */

 /*
  * Copyright (c) 2008 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 <curses.h>
 #include <fnmatch.h>
 #include <stdlib.h>
 #include <string.h>
 #include <term.h>

 #include "tmux.h"

 void	 tty_term_override(struct tty_term *, const char *);
 char	*tty_term_strip(const char *);

 struct tty_terms tty_terms = SLIST_HEAD_INITIALIZER(tty_terms);

 struct tty_term_code_entry tty_term_codes[NTTYCODE] = {
 	{ TTYC_AX, TTYCODE_FLAG, "AX" },
 	{ TTYC_ACSC, TTYCODE_STRING, "acsc" },
 	{ TTYC_BEL, TTYCODE_STRING, "bel" },
 	{ TTYC_BLINK, TTYCODE_STRING, "blink" },
 	{ TTYC_BOLD, TTYCODE_STRING, "bold" },
 	{ TTYC_CIVIS, TTYCODE_STRING, "civis" },
 	{ TTYC_CLEAR, TTYCODE_STRING, "clear" },
 	{ TTYC_CNORM, TTYCODE_STRING, "cnorm" },
 	{ TTYC_COLORS, TTYCODE_NUMBER, "colors" },
 	{ TTYC_CSR, TTYCODE_STRING, "csr" },
 	{ TTYC_CUD, TTYCODE_STRING, "cud" },
 	{ TTYC_CUD1, TTYCODE_STRING, "cud1" },
 	{ TTYC_CUP, TTYCODE_STRING, "cup" },
 	{ TTYC_DCH, TTYCODE_STRING, "dch" },
 	{ TTYC_DCH1, TTYCODE_STRING, "dch1" },
 	{ TTYC_DIM, TTYCODE_STRING, "dim" },
 	{ TTYC_DL, TTYCODE_STRING, "dl" },
 	{ TTYC_DL1, TTYCODE_STRING, "dl1" },
 	{ TTYC_EL, TTYCODE_STRING, "el" },
 	{ TTYC_EL1, TTYCODE_STRING, "el1" },
 	{ TTYC_ENACS, TTYCODE_STRING, "enacs" },
 	{ TTYC_ICH, TTYCODE_STRING, "ich" },
 	{ TTYC_ICH1, TTYCODE_STRING, "ich1" },
 	{ TTYC_IL, TTYCODE_STRING, "il" },
 	{ TTYC_IL1, TTYCODE_STRING, "il1" },
 	{ TTYC_INVIS, TTYCODE_STRING, "invis" },
 	{ TTYC_IS1, TTYCODE_STRING, "is1" },
 	{ TTYC_IS2, TTYCODE_STRING, "is2" },
 	{ TTYC_IS3, TTYCODE_STRING, "is3" },
 	{ TTYC_KCBT, TTYCODE_STRING, "kcbt" },
 	{ TTYC_KCUB1, TTYCODE_STRING, "kcub1" },
 	{ TTYC_KCUD1, TTYCODE_STRING, "kcud1" },
 	{ TTYC_KCUF1, TTYCODE_STRING, "kcuf1" },
 	{ TTYC_KCUU1, TTYCODE_STRING, "kcuu1" },
 	{ TTYC_KDCH1, TTYCODE_STRING, "kdch1" },
 	{ TTYC_KEND, TTYCODE_STRING, "kend" },
 	{ TTYC_KF1, TTYCODE_STRING, "kf1" },
 	{ TTYC_KF10, TTYCODE_STRING, "kf10" },
 	{ TTYC_KF11, TTYCODE_STRING, "kf11" },
 	{ TTYC_KF12, TTYCODE_STRING, "kf12" },
 	{ TTYC_KF13, TTYCODE_STRING, "kf13" },
 	{ TTYC_KF14, TTYCODE_STRING, "kf14" },
 	{ TTYC_KF15, TTYCODE_STRING, "kf15" },
 	{ TTYC_KF16, TTYCODE_STRING, "kf16" },
 	{ TTYC_KF17, TTYCODE_STRING, "kf17" },
 	{ TTYC_KF18, TTYCODE_STRING, "kf18" },
 	{ TTYC_KF19, TTYCODE_STRING, "kf19" },
 	{ TTYC_KF20, TTYCODE_STRING, "kf20" },
 	{ TTYC_KF2, TTYCODE_STRING, "kf2" },
 	{ TTYC_KF3, TTYCODE_STRING, "kf3" },
 	{ TTYC_KF4, TTYCODE_STRING, "kf4" },
 	{ TTYC_KF5, TTYCODE_STRING, "kf5" },
 	{ TTYC_KF6, TTYCODE_STRING, "kf6" },
 	{ TTYC_KF7, TTYCODE_STRING, "kf7" },
 	{ TTYC_KF8, TTYCODE_STRING, "kf8" },
 	{ TTYC_KF9, TTYCODE_STRING, "kf9" },
 	{ TTYC_KHOME, TTYCODE_STRING, "khome" },
 	{ TTYC_KICH1, TTYCODE_STRING, "kich1" },
 	{ TTYC_KMOUS, TTYCODE_STRING, "kmous" },
 	{ TTYC_KNP, TTYCODE_STRING, "knp" },
 	{ TTYC_KPP, TTYCODE_STRING, "kpp" },
 	{ TTYC_OP, TTYCODE_STRING, "op" },
 	{ TTYC_REV, TTYCODE_STRING, "rev" },
 	{ TTYC_RI, TTYCODE_STRING, "ri" },
 	{ TTYC_RMACS, TTYCODE_STRING, "rmacs" },
 	{ TTYC_RMCUP, TTYCODE_STRING, "rmcup" },
 	{ TTYC_RMIR, TTYCODE_STRING, "rmir" },
 	{ TTYC_RMKX, TTYCODE_STRING, "rmkx" },
 	{ TTYC_SETAB, TTYCODE_STRING, "setab" },
 	{ TTYC_SETAF, TTYCODE_STRING, "setaf" },
 	{ TTYC_SGR0, TTYCODE_STRING, "sgr0" },
 	{ TTYC_SMACS, TTYCODE_STRING, "smacs" },
 	{ TTYC_SMCUP, TTYCODE_STRING, "smcup" },
 	{ TTYC_SMIR, TTYCODE_STRING, "smir" },
 	{ TTYC_SMKX, TTYCODE_STRING, "smkx" },
 	{ TTYC_SMSO, TTYCODE_STRING, "smso" },
 	{ TTYC_SMUL, TTYCODE_STRING, "smul" },
 	{ TTYC_XENL, TTYCODE_FLAG, "xenl" },
 };

 char *
 tty_term_strip(const char *s)
 {
 	const char     *ptr;
 	static char	buf[BUFSIZ];
 	size_t		len;

 	/* Ignore strings with no padding. */
 	if (strchr(s, '$') == NULL)
 		return (xstrdup(s));

 	len = 0;
 	for (ptr = s; *ptr != '\0'; ptr++) {
 		if (*ptr == '$' && *(ptr + 1) == '<') {
 			while (*ptr != '\0' && *ptr != '>')
 				ptr++;
 			if (*ptr == '>')
 				ptr++;
 		}

 		buf[len++] = *ptr;
 		if (len == (sizeof buf) - 1)
 			break;
 	}
 	buf[len] = '\0';

 	return (xstrdup(buf));
 }

 void
 tty_term_override(struct tty_term *term, const char *overrides)
 {
 	struct tty_term_code_entry	*ent;
 	struct tty_code			*code;
 	char				*termnext, *termstr, *entnext, *entstr;
 	char				*s, *ptr, *val;
 	const char			*errstr;
 	u_int				 i;
 	int				 n, removeflag;

 	s = xstrdup(overrides);

 	termnext = s;
 	while ((termstr = strsep(&termnext, ",")) != NULL) {
 		entnext = termstr;

 		entstr = strsep(&entnext, ":");
 		if (entstr == NULL || entnext == NULL)
 			continue;
 		if (fnmatch(entstr, term->name, 0) != 0)
 			continue;
 		while ((entstr = strsep(&entnext, ":")) != NULL) {
 			if (*entstr == '\0')
 				continue;

 			val = NULL;
 			removeflag = 0;
  			if ((ptr = strchr(entstr, '=')) != NULL) {
 				*ptr++ = '\0';
 				val = xstrdup(ptr);
 				if (strunvis(val, ptr) == NULL) {
 					xfree(val);
 					val = xstrdup(ptr);
 				}
 			} else if (entstr[strlen(entstr) - 1] == '@') {
 				entstr[strlen(entstr) - 1] = '\0';
 				removeflag = 1;
 			}

 			for (i = 0; i < NTTYCODE; i++) {
 				ent = &tty_term_codes[i];
 				if (strcmp(entstr, ent->name) != 0)
 					continue;
 				code = &term->codes[ent->code];

 				if (removeflag) {
 					code->type = TTYCODE_NONE;
 					continue;
 				}
 				switch (ent->type) {
 				case TTYCODE_NONE:
 					break;
 				case TTYCODE_STRING:
 					if (code->type == TTYCODE_STRING)
 						xfree(code->value.string);
 					code->value.string = xstrdup(val);
 					code->type = ent->type;
 					break;
 				case TTYCODE_NUMBER:
 					n = strtonum(val, 0, INT_MAX, &errstr);
 					if (errstr != NULL)
 						break;
 					code->value.number = n;
 					code->type = ent->type;
 					break;
 				case TTYCODE_FLAG:
 					code->value.flag = 1;
 					code->type = ent->type;
 					break;
 				}
 			}

 			if (val != NULL)
 				xfree(val);
 		}
 	}

 	xfree(s);
 }

 struct tty_term *
 tty_term_find(char *name, int fd, const char *overrides, char **cause)
 {
 	struct tty_term			*term;
 	struct tty_term_code_entry	*ent;
 	struct tty_code			*code;
 	u_int				 i;
 	int		 		 n, error;
 	char				*s;

 	SLIST_FOREACH(term, &tty_terms, entry) {
 		if (strcmp(term->name, name) == 0) {
 			term->references++;
 			return (term);
 		}
 	}

 	log_debug("new term: %s", name);
 	term = xmalloc(sizeof *term);
 	term->name = xstrdup(name);
 	term->references = 1;
 	term->flags = 0;
 	memset(&term->codes, 0, sizeof term->codes);
 	SLIST_INSERT_HEAD(&tty_terms, term, entry);

 	/* Set up curses terminal. */
 	if (setupterm(name, fd, &error) != OK) {
 		switch (error) {
 		case 1:
 			xasprintf(cause, "can't use hardcopy terminal: %s", name);
 			break;
 		case 0:
 			xasprintf(cause, "missing or unsuitable terminal: %s", name);
 			break;
 		case -1:
 			xasprintf(cause, "can't find terminfo database");
 			break;
 		default:
 			xasprintf(cause, "unknown error");
 			break;
 		}
 		goto error;
 	}

 	/* Fill in codes. */
 	for (i = 0; i < NTTYCODE; i++) {
 		ent = &tty_term_codes[i];

 		code = &term->codes[ent->code];
 		code->type = TTYCODE_NONE;
 		switch (ent->type) {
 		case TTYCODE_NONE:
 			break;
 		case TTYCODE_STRING:
 			s = tigetstr((char *) ent->name);
 			if (s == NULL || s == (char *) -1)
 				break;
 			code->type = TTYCODE_STRING;
 			code->value.string = tty_term_strip(s);
 			break;
 		case TTYCODE_NUMBER:
 			n = tigetnum((char *) ent->name);
 			if (n == -1 || n == -2)
 				break;
 			code->type = TTYCODE_NUMBER;
 			code->value.number = n;
 			break;
 		case TTYCODE_FLAG:
 			n = tigetflag((char *) ent->name);
 			if (n == -1)
 				break;
 			code->type = TTYCODE_FLAG;
 			code->value.number = n;
 			break;
 		}
 	}
 	tty_term_override(term, overrides);

 	/* Delete curses data. */
 	del_curterm(cur_term);

 	/* These are always required. */
 	if (!tty_term_has(term, TTYC_CLEAR)) {
 		xasprintf(cause, "terminal does not support clear");
 		goto error;
 	}
 	if (!tty_term_has(term, TTYC_RI)) {
 		xasprintf(cause, "terminal does not support ri");
 		goto error;
 	}
 	if (!tty_term_has(term, TTYC_CUP)) {
 		xasprintf(cause, "terminal does not support cup");
 		goto error;
 	}

 	/* These can be emulated so one of the two is required. */
 	if (!tty_term_has(term, TTYC_CUD1) && !tty_term_has(term, TTYC_CUD)) {
 		xasprintf(cause, "terminal does not support cud1 or cud");
 		goto error;
 	}
 	if (!tty_term_has(term, TTYC_IL1) && !tty_term_has(term, TTYC_IL)) {
 		xasprintf(cause, "terminal does not support il1 or il");
 		goto error;
 	}
 	if (!tty_term_has(term, TTYC_DL1) && !tty_term_has(term, TTYC_DL)) {
 		xasprintf(cause, "terminal does not support dl1 or dl");
 		goto error;
 	}
 	if (!tty_term_has(term, TTYC_ICH1) &&
 	    !tty_term_has(term, TTYC_ICH) && (!tty_term_has(term, TTYC_SMIR) ||
 	    !tty_term_has(term, TTYC_RMIR))) {
 		xasprintf(cause,
 		    "terminal does not support ich1 or ich or smir and rmir");
 		goto error;
 	}
 	if (!tty_term_has(term, TTYC_DCH1) && !tty_term_has(term, TTYC_DCH)) {
 		xasprintf(cause, "terminal does not support dch1 or dch");
 		goto error;
 	}

 	/*
 	 * Figure out if terminal support default colours. AX is a screen
 	 * extension which indicates this. Also check if op (orig_pair) uses
 	 * the default colours - if it does, this is a good indication the
 	 * terminal supports them.
 	 */
 	if (tty_term_flag(term, TTYC_AX))
 		term->flags |= TERM_HASDEFAULTS;
 	if (strcmp(tty_term_string(term, TTYC_OP), "\033[39;49m") == 0)
 		term->flags |= TERM_HASDEFAULTS;

 	/*
 	 * Try to figure out if we have 256 or 88 colours. The standard xterm
 	 * definitions are broken (well, or the way they are parsed is: in any
 	 * case they end up returning 8). So also do a hack.
 	 */
 	if (tty_term_number(term, TTYC_COLORS) == 256)
 		term->flags |= TERM_256COLOURS;
 	if (tty_term_number(term, TTYC_COLORS) == 88)
 		term->flags |= TERM_88COLOURS;

 	/*
 	 * Terminals without xenl (eat newline glitch) wrap at at $COLUMNS - 1
 	 * rather than $COLUMNS (the cursor can never be beyond $COLUMNS - 1).
 	 *
 	 * This is irritating, most notably because it is impossible to write
 	 * to the very bottom-right of the screen without scrolling.
 	 *
 	 * Flag the terminal here and apply some workarounds in other places to
 	 * do the best possible.
 	 */
 	if (!tty_term_flag(term, TTYC_XENL))
 		term->flags |= TERM_EARLYWRAP;

 	return (term);

 error:
 	tty_term_free(term);
 	return (NULL);
 }

 void
 tty_term_free(struct tty_term *term)
 {
 	u_int	i;

 	if (--term->references != 0)
 		return;

 	SLIST_REMOVE(&tty_terms, term, tty_term, entry);

 	for (i = 0; i < NTTYCODE; i++) {
 		if (term->codes[i].type == TTYCODE_STRING)
 			xfree(term->codes[i].value.string);
 	}
 	xfree(term->name);
 	xfree(term);
 }

 int
 tty_term_has(struct tty_term *term, enum tty_code_code code)
 {
 	return (term->codes[code].type != TTYCODE_NONE);
 }

 const char *
 tty_term_string(struct tty_term *term, enum tty_code_code code)
 {
 	if (!tty_term_has(term, code))
 		return ("");
 	if (term->codes[code].type != TTYCODE_STRING)
 		log_fatalx("not a string: %d", code);
 	return (term->codes[code].value.string);
 }

 /* No vtparm. Fucking curses. */
 const char *
 tty_term_string1(struct tty_term *term, enum tty_code_code code, int a)
 {
 	return (tparm((char *) tty_term_string(term, code), a));
 }

 const char *
 tty_term_string2(struct tty_term *term, enum tty_code_code code, int a, int b)
 {
 	return (tparm((char *) tty_term_string(term, code), a, b));
 }

 int
 tty_term_number(struct tty_term *term, enum tty_code_code code)
 {
 	if (!tty_term_has(term, code))
 		return (0);
 	if (term->codes[code].type != TTYCODE_NUMBER)
 		log_fatalx("not a number: %d", code);
 	return (term->codes[code].value.number);
 }

 int
 tty_term_flag(struct tty_term *term, enum tty_code_code code)
 {
 	if (!tty_term_has(term, code))
 		return (0);
 	if (term->codes[code].type != TTYCODE_FLAG)
 		log_fatalx("not a flag: %d", code);
 	return (term->codes[code].value.flag);
 }
	/* $Id: tty-term.c,v 1.28 2009-08-09 16:52:06 tcunha Exp $ */

	/*
	* Copyright (c) 2008 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 <curses.h>
	#include <fnmatch.h>
	#include <stdlib.h>
	#include <string.h>
	#include <term.h>

	#include "tmux.h"

	void tty_term_override(struct tty_term , const char );
	char tty_term_strip(const char );

	struct tty_terms tty_terms = SLIST_HEAD_INITIALIZER(tty_terms);

	struct tty_term_code_entry tty_term_codes[NTTYCODE] = {
	{ TTYC_AX, TTYCODE_FLAG, "AX" },
	{ TTYC_ACSC, TTYCODE_STRING, "acsc" },
	{ TTYC_BEL, TTYCODE_STRING, "bel" },
	{ TTYC_BLINK, TTYCODE_STRING, "blink" },
	{ TTYC_BOLD, TTYCODE_STRING, "bold" },
	{ TTYC_CIVIS, TTYCODE_STRING, "civis" },
	{ TTYC_CLEAR, TTYCODE_STRING, "clear" },
	{ TTYC_CNORM, TTYCODE_STRING, "cnorm" },
	{ TTYC_COLORS, TTYCODE_NUMBER, "colors" },
	{ TTYC_CSR, TTYCODE_STRING, "csr" },
	{ TTYC_CUD, TTYCODE_STRING, "cud" },
	{ TTYC_CUD1, TTYCODE_STRING, "cud1" },
	{ TTYC_CUP, TTYCODE_STRING, "cup" },
	{ TTYC_DCH, TTYCODE_STRING, "dch" },
	{ TTYC_DCH1, TTYCODE_STRING, "dch1" },
	{ TTYC_DIM, TTYCODE_STRING, "dim" },
	{ TTYC_DL, TTYCODE_STRING, "dl" },
	{ TTYC_DL1, TTYCODE_STRING, "dl1" },
	{ TTYC_EL, TTYCODE_STRING, "el" },
	{ TTYC_EL1, TTYCODE_STRING, "el1" },
	{ TTYC_ENACS, TTYCODE_STRING, "enacs" },
	{ TTYC_ICH, TTYCODE_STRING, "ich" },
	{ TTYC_ICH1, TTYCODE_STRING, "ich1" },
	{ TTYC_IL, TTYCODE_STRING, "il" },
	{ TTYC_IL1, TTYCODE_STRING, "il1" },
	{ TTYC_INVIS, TTYCODE_STRING, "invis" },
	{ TTYC_IS1, TTYCODE_STRING, "is1" },
	{ TTYC_IS2, TTYCODE_STRING, "is2" },
	{ TTYC_IS3, TTYCODE_STRING, "is3" },
	{ TTYC_KCBT, TTYCODE_STRING, "kcbt" },
	{ TTYC_KCUB1, TTYCODE_STRING, "kcub1" },
	{ TTYC_KCUD1, TTYCODE_STRING, "kcud1" },
	{ TTYC_KCUF1, TTYCODE_STRING, "kcuf1" },
	{ TTYC_KCUU1, TTYCODE_STRING, "kcuu1" },
	{ TTYC_KDCH1, TTYCODE_STRING, "kdch1" },
	{ TTYC_KEND, TTYCODE_STRING, "kend" },
	{ TTYC_KF1, TTYCODE_STRING, "kf1" },
	{ TTYC_KF10, TTYCODE_STRING, "kf10" },
	{ TTYC_KF11, TTYCODE_STRING, "kf11" },
	{ TTYC_KF12, TTYCODE_STRING, "kf12" },
	{ TTYC_KF13, TTYCODE_STRING, "kf13" },
	{ TTYC_KF14, TTYCODE_STRING, "kf14" },
	{ TTYC_KF15, TTYCODE_STRING, "kf15" },
	{ TTYC_KF16, TTYCODE_STRING, "kf16" },
	{ TTYC_KF17, TTYCODE_STRING, "kf17" },
	{ TTYC_KF18, TTYCODE_STRING, "kf18" },
	{ TTYC_KF19, TTYCODE_STRING, "kf19" },
	{ TTYC_KF20, TTYCODE_STRING, "kf20" },
	{ TTYC_KF2, TTYCODE_STRING, "kf2" },
	{ TTYC_KF3, TTYCODE_STRING, "kf3" },
	{ TTYC_KF4, TTYCODE_STRING, "kf4" },
	{ TTYC_KF5, TTYCODE_STRING, "kf5" },
	{ TTYC_KF6, TTYCODE_STRING, "kf6" },
	{ TTYC_KF7, TTYCODE_STRING, "kf7" },
	{ TTYC_KF8, TTYCODE_STRING, "kf8" },
	{ TTYC_KF9, TTYCODE_STRING, "kf9" },
	{ TTYC_KHOME, TTYCODE_STRING, "khome" },
	{ TTYC_KICH1, TTYCODE_STRING, "kich1" },
	{ TTYC_KMOUS, TTYCODE_STRING, "kmous" },
	{ TTYC_KNP, TTYCODE_STRING, "knp" },
	{ TTYC_KPP, TTYCODE_STRING, "kpp" },
	{ TTYC_OP, TTYCODE_STRING, "op" },
	{ TTYC_REV, TTYCODE_STRING, "rev" },
	{ TTYC_RI, TTYCODE_STRING, "ri" },
	{ TTYC_RMACS, TTYCODE_STRING, "rmacs" },
	{ TTYC_RMCUP, TTYCODE_STRING, "rmcup" },
	{ TTYC_RMIR, TTYCODE_STRING, "rmir" },
	{ TTYC_RMKX, TTYCODE_STRING, "rmkx" },
	{ TTYC_SETAB, TTYCODE_STRING, "setab" },
	{ TTYC_SETAF, TTYCODE_STRING, "setaf" },
	{ TTYC_SGR0, TTYCODE_STRING, "sgr0" },
	{ TTYC_SMACS, TTYCODE_STRING, "smacs" },
	{ TTYC_SMCUP, TTYCODE_STRING, "smcup" },
	{ TTYC_SMIR, TTYCODE_STRING, "smir" },
	{ TTYC_SMKX, TTYCODE_STRING, "smkx" },
	{ TTYC_SMSO, TTYCODE_STRING, "smso" },
	{ TTYC_SMUL, TTYCODE_STRING, "smul" },
	{ TTYC_XENL, TTYCODE_FLAG, "xenl" },
	};

	char *
	tty_term_strip(const char *s)
	{
	const char *ptr;
	static char buf[BUFSIZ];
	size_t len;

	/* Ignore strings with no padding. */
	if (strchr(s, '$') == NULL)
	return (xstrdup(s));

	len = 0;
	for (ptr = s; *ptr != '\0'; ptr++) {
	if (ptr == '$' && (ptr + 1) == '<') {
	while (ptr != '\0' && ptr != '>')
	ptr++;
	if (*ptr == '>')
	ptr++;
	}

	buf[len++] = *ptr;
	if (len == (sizeof buf) - 1)
	break;
	}
	buf[len] = '\0';

	return (xstrdup(buf));
	}

	void
	tty_term_override(struct tty_term term, const char overrides)
	{
	struct tty_term_code_entry *ent;
	struct tty_code *code;
	char termnext, termstr, entnext, entstr;
	char s, ptr, *val;
	const char *errstr;
	u_int i;
	int n, removeflag;

	s = xstrdup(overrides);

	termnext = s;
	while ((termstr = strsep(&termnext, ",")) != NULL) {
	entnext = termstr;

	entstr = strsep(&entnext, ":");
	if (entstr == NULL \|\| entnext == NULL)
	continue;
	if (fnmatch(entstr, term->name, 0) != 0)
	continue;
	while ((entstr = strsep(&entnext, ":")) != NULL) {
	if (*entstr == '\0')
	continue;

	val = NULL;
	removeflag = 0;
	if ((ptr = strchr(entstr, '=')) != NULL) {
	*ptr++ = '\0';
	val = xstrdup(ptr);
	if (strunvis(val, ptr) == NULL) {
	xfree(val);
	val = xstrdup(ptr);
	}
	} else if (entstr[strlen(entstr) - 1] == '@') {
	entstr[strlen(entstr) - 1] = '\0';
	removeflag = 1;
	}

	for (i = 0; i < NTTYCODE; i++) {
	ent = &tty_term_codes[i];
	if (strcmp(entstr, ent->name) != 0)
	continue;
	code = &term->codes[ent->code];

	if (removeflag) {
	code->type = TTYCODE_NONE;
	continue;
	}
	switch (ent->type) {
	case TTYCODE_NONE:
	break;
	case TTYCODE_STRING:
	if (code->type == TTYCODE_STRING)
	xfree(code->value.string);
	code->value.string = xstrdup(val);
	code->type = ent->type;
	break;
	case TTYCODE_NUMBER:
	n = strtonum(val, 0, INT_MAX, &errstr);
	if (errstr != NULL)
	break;
	code->value.number = n;
	code->type = ent->type;
	break;
	case TTYCODE_FLAG:
	code->value.flag = 1;
	code->type = ent->type;
	break;
	}
	}

	if (val != NULL)
	xfree(val);
	}
	}

	xfree(s);
	}

	struct tty_term *
	tty_term_find(char name, int fd, const char overrides, char **cause)
	{
	struct tty_term *term;
	struct tty_term_code_entry *ent;
	struct tty_code *code;
	u_int i;
	int n, error;
	char *s;

	SLIST_FOREACH(term, &tty_terms, entry) {
	if (strcmp(term->name, name) == 0) {
	term->references++;
	return (term);
	}
	}

	log_debug("new term: %s", name);
	term = xmalloc(sizeof *term);
	term->name = xstrdup(name);
	term->references = 1;
	term->flags = 0;
	memset(&term->codes, 0, sizeof term->codes);
	SLIST_INSERT_HEAD(&tty_terms, term, entry);

	/* Set up curses terminal. */
	if (setupterm(name, fd, &error) != OK) {
	switch (error) {
	case 1:
	xasprintf(cause, "can't use hardcopy terminal: %s", name);
	break;
	case 0:
	xasprintf(cause, "missing or unsuitable terminal: %s", name);
	break;
	case -1:
	xasprintf(cause, "can't find terminfo database");
	break;
	default:
	xasprintf(cause, "unknown error");
	break;
	}
	goto error;
	}

	/* Fill in codes. */
	for (i = 0; i < NTTYCODE; i++) {
	ent = &tty_term_codes[i];

	code = &term->codes[ent->code];
	code->type = TTYCODE_NONE;
	switch (ent->type) {
	case TTYCODE_NONE:
	break;
	case TTYCODE_STRING:
	s = tigetstr((char *) ent->name);
	if (s == NULL \|\| s == (char *) -1)
	break;
	code->type = TTYCODE_STRING;
	code->value.string = tty_term_strip(s);
	break;
	case TTYCODE_NUMBER:
	n = tigetnum((char *) ent->name);
	if (n == -1 \|\| n == -2)
	break;
	code->type = TTYCODE_NUMBER;
	code->value.number = n;
	break;
	case TTYCODE_FLAG:
	n = tigetflag((char *) ent->name);
	if (n == -1)
	break;
	code->type = TTYCODE_FLAG;
	code->value.number = n;
	break;
	}
	}
	tty_term_override(term, overrides);

	/* Delete curses data. */
	del_curterm(cur_term);

	/* These are always required. */
	if (!tty_term_has(term, TTYC_CLEAR)) {
	xasprintf(cause, "terminal does not support clear");
	goto error;
	}
	if (!tty_term_has(term, TTYC_RI)) {
	xasprintf(cause, "terminal does not support ri");
	goto error;
	}
	if (!tty_term_has(term, TTYC_CUP)) {
	xasprintf(cause, "terminal does not support cup");
	goto error;
	}

	/* These can be emulated so one of the two is required. */
	if (!tty_term_has(term, TTYC_CUD1) && !tty_term_has(term, TTYC_CUD)) {
	xasprintf(cause, "terminal does not support cud1 or cud");
	goto error;
	}
	if (!tty_term_has(term, TTYC_IL1) && !tty_term_has(term, TTYC_IL)) {
	xasprintf(cause, "terminal does not support il1 or il");
	goto error;
	}
	if (!tty_term_has(term, TTYC_DL1) && !tty_term_has(term, TTYC_DL)) {
	xasprintf(cause, "terminal does not support dl1 or dl");
	goto error;
	}
	if (!tty_term_has(term, TTYC_ICH1) &&
	!tty_term_has(term, TTYC_ICH) && (!tty_term_has(term, TTYC_SMIR) \|\|
	!tty_term_has(term, TTYC_RMIR))) {
	xasprintf(cause,
	"terminal does not support ich1 or ich or smir and rmir");
	goto error;
	}
	if (!tty_term_has(term, TTYC_DCH1) && !tty_term_has(term, TTYC_DCH)) {
	xasprintf(cause, "terminal does not support dch1 or dch");
	goto error;
	}

	/*
	* Figure out if terminal support default colours. AX is a screen
	* extension which indicates this. Also check if op (orig_pair) uses
	* the default colours - if it does, this is a good indication the
	* terminal supports them.
	*/
	if (tty_term_flag(term, TTYC_AX))
	term->flags \|= TERM_HASDEFAULTS;
	if (strcmp(tty_term_string(term, TTYC_OP), "\033[39;49m") == 0)
	term->flags \|= TERM_HASDEFAULTS;

	/*
	* Try to figure out if we have 256 or 88 colours. The standard xterm
	* definitions are broken (well, or the way they are parsed is: in any
	* case they end up returning 8). So also do a hack.
	*/
	if (tty_term_number(term, TTYC_COLORS) == 256)
	term->flags \|= TERM_256COLOURS;
	if (tty_term_number(term, TTYC_COLORS) == 88)
	term->flags \|= TERM_88COLOURS;

	/*
	* Terminals without xenl (eat newline glitch) wrap at at $COLUMNS - 1
	* rather than $COLUMNS (the cursor can never be beyond $COLUMNS - 1).
	*
	* This is irritating, most notably because it is impossible to write
	* to the very bottom-right of the screen without scrolling.
	*
	* Flag the terminal here and apply some workarounds in other places to
	* do the best possible.
	*/
	if (!tty_term_flag(term, TTYC_XENL))
	term->flags \|= TERM_EARLYWRAP;

	return (term);

	error:
	tty_term_free(term);
	return (NULL);
	}

	void
	tty_term_free(struct tty_term *term)
	{
	u_int i;

	if (--term->references != 0)
	return;

	SLIST_REMOVE(&tty_terms, term, tty_term, entry);

	for (i = 0; i < NTTYCODE; i++) {
	if (term->codes[i].type == TTYCODE_STRING)
	xfree(term->codes[i].value.string);
	}
	xfree(term->name);
	xfree(term);
	}

	int
	tty_term_has(struct tty_term *term, enum tty_code_code code)
	{
	return (term->codes[code].type != TTYCODE_NONE);
	}

	const char *
	tty_term_string(struct tty_term *term, enum tty_code_code code)
	{
	if (!tty_term_has(term, code))
	return ("");
	if (term->codes[code].type != TTYCODE_STRING)
	log_fatalx("not a string: %d", code);
	return (term->codes[code].value.string);
	}

	/* No vtparm. Fucking curses. */
	const char *
	tty_term_string1(struct tty_term *term, enum tty_code_code code, int a)
	{
	return (tparm((char *) tty_term_string(term, code), a));
	}

	const char *
	tty_term_string2(struct tty_term *term, enum tty_code_code code, int a, int b)
	{
	return (tparm((char *) tty_term_string(term, code), a, b));
	}

	int
	tty_term_number(struct tty_term *term, enum tty_code_code code)
	{
	if (!tty_term_has(term, code))
	return (0);
	if (term->codes[code].type != TTYCODE_NUMBER)
	log_fatalx("not a number: %d", code);
	return (term->codes[code].value.number);
	}

	int
	tty_term_flag(struct tty_term *term, enum tty_code_code code)
	{
	if (!tty_term_has(term, code))
	return (0);
	if (term->codes[code].type != TTYCODE_FLAG)
	log_fatalx("not a flag: %d", code);
	return (term->codes[code].value.flag);
	}