text: /* $OpenBSD$ */
  
  /*
   * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
   *
   * 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>
  
  #if defined(HAVE_CURSES_H)
  #include <curses.h>
  #elif defined(HAVE_NCURSES_H)
  #include <ncurses.h>
  #endif
  #include <fnmatch.h>
  #include <stdlib.h>
  #include <string.h>
  #include <term.h>
  
  #include "tmux.h"
  
  static void	 tty_term_override(struct tty_term *, const char *);
  static char	*tty_term_strip(const char *);
  
  struct tty_terms tty_terms = LIST_HEAD_INITIALIZER(tty_terms);
  
  enum tty_code_type {
  	TTYCODE_NONE = 0,
  	TTYCODE_STRING,
  	TTYCODE_NUMBER,
  	TTYCODE_FLAG,
  };
  
  struct tty_code {
  	enum tty_code_type	type;
  	union {
  		char	       *string;
  		int		number;
  		int		flag;
  	} value;
  };
  
  struct tty_term_code_entry {
  	enum tty_code_type	type;
  	const char	       *name;
  };
  
  static const struct tty_term_code_entry tty_term_codes[] = {
  	[TTYC_ACSC] = { TTYCODE_STRING, "acsc" },
  	[TTYC_AX] = { TTYCODE_FLAG, "AX" },
  	[TTYC_BCE] = { TTYCODE_FLAG, "bce" },
  	[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_CR] = { TTYCODE_STRING, "Cr" },
  	[TTYC_CSR] = { TTYCODE_STRING, "csr" },
  	[TTYC_CS] = { TTYCODE_STRING, "Cs" },
  	[TTYC_CUB1] = { TTYCODE_STRING, "cub1" },
  	[TTYC_CUB] = { TTYCODE_STRING, "cub" },
  	[TTYC_CUD1] = { TTYCODE_STRING, "cud1" },
  	[TTYC_CUD] = { TTYCODE_STRING, "cud" },
  	[TTYC_CUF1] = { TTYCODE_STRING, "cuf1" },
  	[TTYC_CUF] = { TTYCODE_STRING, "cuf" },
  	[TTYC_CUP] = { TTYCODE_STRING, "cup" },
  	[TTYC_CUU1] = { TTYCODE_STRING, "cuu1" },
  	[TTYC_CUU] = { TTYCODE_STRING, "cuu" },
  	[TTYC_CVVIS] = { TTYCODE_STRING, "cvvis" },
  	[TTYC_DCH1] = { TTYCODE_STRING, "dch1" },
  	[TTYC_DCH] = { TTYCODE_STRING, "dch" },
  	[TTYC_DIM] = { TTYCODE_STRING, "dim" },
  	[TTYC_DL1] = { TTYCODE_STRING, "dl1" },
  	[TTYC_DL] = { TTYCODE_STRING, "dl" },
  	[TTYC_E3] = { TTYCODE_STRING, "E3" },
  	[TTYC_ECH] = { TTYCODE_STRING, "ech" },
  	[TTYC_ED] = { TTYCODE_STRING, "ed" },
  	[TTYC_EL1] = { TTYCODE_STRING, "el1" },
  	[TTYC_EL] = { TTYCODE_STRING, "el" },
  	[TTYC_ENACS] = { TTYCODE_STRING, "enacs" },
  	[TTYC_FSL] = { TTYCODE_STRING, "fsl" },
  	[TTYC_HOME] = { TTYCODE_STRING, "home" },
  	[TTYC_HPA] = { TTYCODE_STRING, "hpa" },
  	[TTYC_ICH1] = { TTYCODE_STRING, "ich1" },
  	[TTYC_ICH] = { TTYCODE_STRING, "ich" },
  	[TTYC_IL1] = { TTYCODE_STRING, "il1" },
  	[TTYC_IL] = { TTYCODE_STRING, "il" },
  	[TTYC_INDN] = { TTYCODE_STRING, "indn" },
  	[TTYC_INVIS] = { TTYCODE_STRING, "invis" },
  	[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_KDC2] = { TTYCODE_STRING, "kDC" },
  	[TTYC_KDC3] = { TTYCODE_STRING, "kDC3" },
  	[TTYC_KDC4] = { TTYCODE_STRING, "kDC4" },
  	[TTYC_KDC5] = { TTYCODE_STRING, "kDC5" },
  	[TTYC_KDC6] = { TTYCODE_STRING, "kDC6" },
  	[TTYC_KDC7] = { TTYCODE_STRING, "kDC7" },
  	[TTYC_KDCH1] = { TTYCODE_STRING, "kdch1" },
  	[TTYC_KDN2] = { TTYCODE_STRING, "kDN" }, /* not kDN2 */
  	[TTYC_KDN3] = { TTYCODE_STRING, "kDN3" },
  	[TTYC_KDN4] = { TTYCODE_STRING, "kDN4" },
  	[TTYC_KDN5] = { TTYCODE_STRING, "kDN5" },
  	[TTYC_KDN6] = { TTYCODE_STRING, "kDN6" },
  	[TTYC_KDN7] = { TTYCODE_STRING, "kDN7" },
  	[TTYC_KEND2] = { TTYCODE_STRING, "kEND" },
  	[TTYC_KEND3] = { TTYCODE_STRING, "kEND3" },
  	[TTYC_KEND4] = { TTYCODE_STRING, "kEND4" },
  	[TTYC_KEND5] = { TTYCODE_STRING, "kEND5" },
  	[TTYC_KEND6] = { TTYCODE_STRING, "kEND6" },
  	[TTYC_KEND7] = { TTYCODE_STRING, "kEND7" },
  	[TTYC_KEND] = { TTYCODE_STRING, "kend" },
  	[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_KF1] = { TTYCODE_STRING, "kf1" },
  	[TTYC_KF20] = { TTYCODE_STRING, "kf20" },
  	[TTYC_KF21] = { TTYCODE_STRING, "kf21" },
  	[TTYC_KF22] = { TTYCODE_STRING, "kf22" },
  	[TTYC_KF23] = { TTYCODE_STRING, "kf23" },
  	[TTYC_KF24] = { TTYCODE_STRING, "kf24" },
  	[TTYC_KF25] = { TTYCODE_STRING, "kf25" },
  	[TTYC_KF26] = { TTYCODE_STRING, "kf26" },
  	[TTYC_KF27] = { TTYCODE_STRING, "kf27" },
  	[TTYC_KF28] = { TTYCODE_STRING, "kf28" },
  	[TTYC_KF29] = { TTYCODE_STRING, "kf29" },
  	[TTYC_KF2] = { TTYCODE_STRING, "kf2" },
  	[TTYC_KF30] = { TTYCODE_STRING, "kf30" },
  	[TTYC_KF31] = { TTYCODE_STRING, "kf31" },
  	[TTYC_KF32] = { TTYCODE_STRING, "kf32" },
  	[TTYC_KF33] = { TTYCODE_STRING, "kf33" },
  	[TTYC_KF34] = { TTYCODE_STRING, "kf34" },
  	[TTYC_KF35] = { TTYCODE_STRING, "kf35" },
  	[TTYC_KF36] = { TTYCODE_STRING, "kf36" },
  	[TTYC_KF37] = { TTYCODE_STRING, "kf37" },
  	[TTYC_KF38] = { TTYCODE_STRING, "kf38" },
  	[TTYC_KF39] = { TTYCODE_STRING, "kf39" },
  	[TTYC_KF3] = { TTYCODE_STRING, "kf3" },
  	[TTYC_KF40] = { TTYCODE_STRING, "kf40" },
  	[TTYC_KF41] = { TTYCODE_STRING, "kf41" },
  	[TTYC_KF42] = { TTYCODE_STRING, "kf42" },
  	[TTYC_KF43] = { TTYCODE_STRING, "kf43" },
  	[TTYC_KF44] = { TTYCODE_STRING, "kf44" },
  	[TTYC_KF45] = { TTYCODE_STRING, "kf45" },
  	[TTYC_KF46] = { TTYCODE_STRING, "kf46" },
  	[TTYC_KF47] = { TTYCODE_STRING, "kf47" },
  	[TTYC_KF48] = { TTYCODE_STRING, "kf48" },
  	[TTYC_KF49] = { TTYCODE_STRING, "kf49" },
  	[TTYC_KF4] = { TTYCODE_STRING, "kf4" },
  	[TTYC_KF50] = { TTYCODE_STRING, "kf50" },
  	[TTYC_KF51] = { TTYCODE_STRING, "kf51" },
  	[TTYC_KF52] = { TTYCODE_STRING, "kf52" },
  	[TTYC_KF53] = { TTYCODE_STRING, "kf53" },
  	[TTYC_KF54] = { TTYCODE_STRING, "kf54" },
  	[TTYC_KF55] = { TTYCODE_STRING, "kf55" },
  	[TTYC_KF56] = { TTYCODE_STRING, "kf56" },
  	[TTYC_KF57] = { TTYCODE_STRING, "kf57" },
  	[TTYC_KF58] = { TTYCODE_STRING, "kf58" },
  	[TTYC_KF59] = { TTYCODE_STRING, "kf59" },
  	[TTYC_KF5] = { TTYCODE_STRING, "kf5" },
  	[TTYC_KF60] = { TTYCODE_STRING, "kf60" },
  	[TTYC_KF61] = { TTYCODE_STRING, "kf61" },
  	[TTYC_KF62] = { TTYCODE_STRING, "kf62" },
  	[TTYC_KF63] = { TTYCODE_STRING, "kf63" },
  	[TTYC_KF6] = { TTYCODE_STRING, "kf6" },
  	[TTYC_KF7] = { TTYCODE_STRING, "kf7" },
  	[TTYC_KF8] = { TTYCODE_STRING, "kf8" },
  	[TTYC_KF9] = { TTYCODE_STRING, "kf9" },
  	[TTYC_KHOM2] = { TTYCODE_STRING, "kHOM" },
  	[TTYC_KHOM3] = { TTYCODE_STRING, "kHOM3" },
  	[TTYC_KHOM4] = { TTYCODE_STRING, "kHOM4" },
  	[TTYC_KHOM5] = { TTYCODE_STRING, "kHOM5" },
  	[TTYC_KHOM6] = { TTYCODE_STRING, "kHOM6" },
  	[TTYC_KHOM7] = { TTYCODE_STRING, "kHOM7" },
  	[TTYC_KHOME] = { TTYCODE_STRING, "khome" },
  	[TTYC_KIC2] = { TTYCODE_STRING, "kIC" },
  	[TTYC_KIC3] = { TTYCODE_STRING, "kIC3" },
  	[TTYC_KIC4] = { TTYCODE_STRING, "kIC4" },
  	[TTYC_KIC5] = { TTYCODE_STRING, "kIC5" },
  	[TTYC_KIC6] = { TTYCODE_STRING, "kIC6" },
  	[TTYC_KIC7] = { TTYCODE_STRING, "kIC7" },
  	[TTYC_KICH1] = { TTYCODE_STRING, "kich1" },
  	[TTYC_KIND] = { TTYCODE_STRING, "kind" },
  	[TTYC_KLFT2] = { TTYCODE_STRING, "kLFT" },
  	[TTYC_KLFT3] = { TTYCODE_STRING, "kLFT3" },
  	[TTYC_KLFT4] = { TTYCODE_STRING, "kLFT4" },
  	[TTYC_KLFT5] = { TTYCODE_STRING, "kLFT5" },
  	[TTYC_KLFT6] = { TTYCODE_STRING, "kLFT6" },
  	[TTYC_KLFT7] = { TTYCODE_STRING, "kLFT7" },
  	[TTYC_KMOUS] = { TTYCODE_STRING, "kmous" },
  	[TTYC_KNP] = { TTYCODE_STRING, "knp" },
  	[TTYC_KNXT2] = { TTYCODE_STRING, "kNXT" },
  	[TTYC_KNXT3] = { TTYCODE_STRING, "kNXT3" },
  	[TTYC_KNXT4] = { TTYCODE_STRING, "kNXT4" },
  	[TTYC_KNXT5] = { TTYCODE_STRING, "kNXT5" },
  	[TTYC_KNXT6] = { TTYCODE_STRING, "kNXT6" },
  	[TTYC_KNXT7] = { TTYCODE_STRING, "kNXT7" },
  	[TTYC_KPP] = { TTYCODE_STRING, "kpp" },
  	[TTYC_KPRV2] = { TTYCODE_STRING, "kPRV" },
  	[TTYC_KPRV3] = { TTYCODE_STRING, "kPRV3" },
  	[TTYC_KPRV4] = { TTYCODE_STRING, "kPRV4" },
  	[TTYC_KPRV5] = { TTYCODE_STRING, "kPRV5" },
  	[TTYC_KPRV6] = { TTYCODE_STRING, "kPRV6" },
  	[TTYC_KPRV7] = { TTYCODE_STRING, "kPRV7" },
  	[TTYC_KRIT2] = { TTYCODE_STRING, "kRIT" },
  	[TTYC_KRIT3] = { TTYCODE_STRING, "kRIT3" },
  	[TTYC_KRIT4] = { TTYCODE_STRING, "kRIT4" },
  	[TTYC_KRIT5] = { TTYCODE_STRING, "kRIT5" },
  	[TTYC_KRIT6] = { TTYCODE_STRING, "kRIT6" },
  	[TTYC_KRIT7] = { TTYCODE_STRING, "kRIT7" },
  	[TTYC_KRI] = { TTYCODE_STRING, "kri" },
  	[TTYC_KUP2] = { TTYCODE_STRING, "kUP" }, /* not kUP2 */
  	[TTYC_KUP3] = { TTYCODE_STRING, "kUP3" },
  	[TTYC_KUP4] = { TTYCODE_STRING, "kUP4" },
  	[TTYC_KUP5] = { TTYCODE_STRING, "kUP5" },
  	[TTYC_KUP6] = { TTYCODE_STRING, "kUP6" },
  	[TTYC_KUP7] = { TTYCODE_STRING, "kUP7" },
  	[TTYC_MGC] = { TTYCODE_STRING, "mgc" },
  	[TTYC_MS] = { TTYCODE_STRING, "Ms" },
  	[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_RMKX] = { TTYCODE_STRING, "rmkx" },
  	[TTYC_SETAB] = { TTYCODE_STRING, "setab" },
  	[TTYC_SETAF] = { TTYCODE_STRING, "setaf" },
  	[TTYC_SETRGBB] = { TTYCODE_STRING, "setrgbb" },
  	[TTYC_SETRGBF] = { TTYCODE_STRING, "setrgbf" },
  	[TTYC_SE] = { TTYCODE_STRING, "Se" },
  	[TTYC_SGR0] = { TTYCODE_STRING, "sgr0" },
  	[TTYC_SITM] = { TTYCODE_STRING, "sitm" },
  	[TTYC_SMACS] = { TTYCODE_STRING, "smacs" },
  	[TTYC_SMCUP] = { TTYCODE_STRING, "smcup" },
  	[TTYC_SMGLR] = { TTYCODE_STRING, "smglr" },
  	[TTYC_SMKX] = { TTYCODE_STRING, "smkx" },
  	[TTYC_SMSO] = { TTYCODE_STRING, "smso" },
  	[TTYC_SMUL] = { TTYCODE_STRING, "smul" },
  	[TTYC_SMXX] =  { TTYCODE_STRING, "smxx" },
  	[TTYC_SS] = { TTYCODE_STRING, "Ss" },
  	[TTYC_TC] = { TTYCODE_FLAG, "Tc" },
  	[TTYC_TSL] = { TTYCODE_STRING, "tsl" },
  	[TTYC_U8] = { TTYCODE_NUMBER, "U8" },
  	[TTYC_VPA] = { TTYCODE_STRING, "vpa" },
  	[TTYC_XENL] = { TTYCODE_FLAG, "xenl" },
  	[TTYC_XT] = { TTYCODE_FLAG, "XT" },
  };
  
  u_int
  tty_term_ncodes(void)
  {
  	return (nitems(tty_term_codes));
  }
  
  static 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));
  }
  
  static void
  tty_term_override(struct tty_term *term, const char *override)
  {
  	const struct tty_term_code_entry	*ent;
  	struct tty_code				*code;
  	char					*next, *s, *copy, *cp, *value;
  	const char				*errstr;
  	u_int					 i;
  	int					 n, remove;
  
  	copy = next = xstrdup(override);
  
  	s = strsep(&next, ":");
  	if (s == NULL || next == NULL || fnmatch(s, term->name, 0) != 0) {
  		free(copy);
  		return;
  	}
  
  	while ((s = strsep(&next, ":")) != NULL) {
  		if (*s == '\0')
  			continue;
  		value = NULL;
  
  		remove = 0;
  		if ((cp = strchr(s, '=')) != NULL) {
  			*cp++ = '\0';
  			value = xstrdup(cp);
  			if (strunvis(value, cp) == -1) {
  				free(value);
  				value = xstrdup(cp);
  			}
  		} else if (s[strlen(s) - 1] == '@') {
  			s[strlen(s) - 1] = '\0';
  			remove = 1;
  		} else
  			value = xstrdup("");
  
  		if (remove)
  			log_debug("%s override: %s@", term->name, s);
  		else
  			log_debug("%s override: %s=%s", term->name, s, value);
  
  		for (i = 0; i < tty_term_ncodes(); i++) {
  			ent = &tty_term_codes[i];
  			if (strcmp(s, ent->name) != 0)
  				continue;
  			code = &term->codes[i];
  
  			if (remove) {
  				code->type = TTYCODE_NONE;
  				continue;
  			}
  			switch (ent->type) {
  			case TTYCODE_NONE:
  				break;
  			case TTYCODE_STRING:
  				if (code->type == TTYCODE_STRING)
  					free(code->value.string);
  				code->value.string = xstrdup(value);
  				code->type = ent->type;
  				break;
  			case TTYCODE_NUMBER:
  				n = strtonum(value, 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;
  			}
  		}
  
  		free(value);
  	}
  	free(s);
  }
  
  struct tty_term *
  tty_term_find(char *name, int fd, char **cause)
  {
  	struct tty_term				*term;
  	const struct tty_term_code_entry	*ent;
  	struct tty_code				*code;
  	struct options_entry			*o;
  	u_int					 size, i;
  	int		 			 n, error;
  	const char				*s, *acs;
  
  	LIST_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;
  	term->codes = xcalloc(tty_term_ncodes(), sizeof *term->codes);
  	LIST_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 < tty_term_ncodes(); i++) {
  		ent = &tty_term_codes[i];
  
  		code = &term->codes[i];
  		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.flag = n;
  			break;
  		}
  	}
  
  	/* Apply terminal overrides. */
  	o = options_get_only(global_options, "terminal-overrides");
  	if (options_array_size(o, &size) != -1) {
  		for (i = 0; i < size; i++) {
  			s = options_array_get(o, i);
  			if (s != NULL)
  				tty_term_override(term, s);
  		}
  	}
  
  	/* Delete curses data. */
  #if !defined(NCURSES_VERSION_MAJOR) || NCURSES_VERSION_MAJOR > 5 || \
      (NCURSES_VERSION_MAJOR == 5 && NCURSES_VERSION_MINOR > 6)
  	del_curterm(cur_term);
  #endif
  
  	/* 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_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;
  	}
  
  	/* Figure out if we have 256. */
  	if (tty_term_number(term, TTYC_COLORS) == 256)
  		term->flags |= TERM_256COLOURS;
  
  	/*
  	 * 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;
  
  	/* Generate ACS table. If none is present, use nearest ASCII. */
  	memset(term->acs, 0, sizeof term->acs);
  	if (tty_term_has(term, TTYC_ACSC))
  		acs = tty_term_string(term, TTYC_ACSC);
  	else
  		acs = "a#j+k+l+m+n+o-p-q-r-s-t+u+v+w+x|y<z>~.";
  	for (; acs[0] != '\0' && acs[1] != '\0'; acs += 2)
  		term->acs[(u_char) acs[0]][0] = acs[1];
  
  	/* On terminals with xterm titles (XT), fill in tsl and fsl. */
  	if (tty_term_flag(term, TTYC_XT) &&
  	    !tty_term_has(term, TTYC_TSL) &&
  	    !tty_term_has(term, TTYC_FSL)) {
  		code = &term->codes[TTYC_TSL];
  		code->value.string = xstrdup("\033]0;");
  		code->type = TTYCODE_STRING;
  		code = &term->codes[TTYC_FSL];
  		code->value.string = xstrdup("\007");
  		code->type = TTYCODE_STRING;
  	}
  
  	/* On terminals with RGB colour (TC), fill in setrgbf and setrgbb. */
  	if (tty_term_flag(term, TTYC_TC) &&
  	    !tty_term_has(term, TTYC_SETRGBF) &&
  	    !tty_term_has(term, TTYC_SETRGBB)) {
  		code = &term->codes[TTYC_SETRGBF];
  		code->value.string = xstrdup("\033[38;2;%p1%d;%p2%d;%p3%dm");
  		code->type = TTYCODE_STRING;
  		code = &term->codes[TTYC_SETRGBB];
  		code->value.string = xstrdup("\033[48;2;%p1%d;%p2%d;%p3%dm");
  		code->type = TTYCODE_STRING;
  	}
  
  	/* Log it. */
  	for (i = 0; i < tty_term_ncodes(); i++)
  		log_debug("%s%s", name, tty_term_describe(term, i));
  
  	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;
  
  	LIST_REMOVE(term, entry);
  
  	for (i = 0; i < tty_term_ncodes(); i++) {
  		if (term->codes[i].type == TTYCODE_STRING)
  			free(term->codes[i].value.string);
  	}
  	free(term->codes);
  
  	free(term->name);
  	free(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)
  		fatalx("not a string: %d", code);
  	return (term->codes[code].value.string);
  }
  
  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, 0, 0, 0, 0, 0, 0, 0, 0));
  }
  
  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, 0, 0, 0, 0, 0, 0, 0));
  }
  
  const char *
  tty_term_string3(struct tty_term *term, enum tty_code_code code, int a, int b, int c)
  {
  	return (tparm((char *) tty_term_string(term, code), a, b, c, 0, 0, 0, 0, 0, 0));
  }
  
  const char *
  tty_term_ptr1(struct tty_term *term, enum tty_code_code code, const void *a)
  {
  	return (tparm((char *) tty_term_string(term, code), a, 0, 0, 0, 0, 0, 0, 0, 0));
  }
  
  const char *
  tty_term_ptr2(struct tty_term *term, enum tty_code_code code, const void *a,
      const void *b)
  {
  	return (tparm((char *) tty_term_string(term, code), a, b, 0, 0, 0, 0, 0, 0, 0));
  }
  
  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)
  		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)
  		fatalx("not a flag: %d", code);
  	return (term->codes[code].value.flag);
  }
  
  const char *
  tty_term_describe(struct tty_term *term, enum tty_code_code code)
  {
  	static char	 s[256];
  	char		 out[128];
  
  	switch (term->codes[code].type) {
  	case TTYCODE_NONE:
  		xsnprintf(s, sizeof s, "%4u: %s: [missing]",
  		    code, tty_term_codes[code].name);
  		break;
  	case TTYCODE_STRING:
  		strnvis(out, term->codes[code].value.string, sizeof out,
  		    VIS_OCTAL|VIS_TAB|VIS_NL);
  		xsnprintf(s, sizeof s, "%4u: %s: (string) %s",
  		    code, tty_term_codes[code].name,
  		    out);
  		break;
  	case TTYCODE_NUMBER:
  		xsnprintf(s, sizeof s, "%4u: %s: (number) %d",
  		    code, tty_term_codes[code].name,
  		    term->codes[code].value.number);
  		break;
  	case TTYCODE_FLAG:
  		xsnprintf(s, sizeof s, "%4u: %s: (flag) %s",
  		    code, tty_term_codes[code].name,
  		    term->codes[code].value.flag ? "true" : "false");
  		break;
  	}
  	return (s);
  }
  