utf8.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * 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 <stdlib.h>
 #include <string.h>

 #include "tmux.h"

 struct utf8_width_entry {
 	u_int	first;
 	u_int	last;

 	int	width;

 	struct utf8_width_entry	*left;
 	struct utf8_width_entry	*right;
 };

 /* Sorted, then repeatedly split in the middle to balance the tree. */
 struct utf8_width_entry utf8_width_table[] = {
 	{ 0x00b41, 0x00b44, 0, NULL, NULL },
 	{ 0x008e4, 0x00902, 0, NULL, NULL },
 	{ 0x006d6, 0x006dd, 0, NULL, NULL },
 	{ 0x005c4, 0x005c5, 0, NULL, NULL },
 	{ 0x00591, 0x005bd, 0, NULL, NULL },
 	{ 0x00300, 0x0036f, 0, NULL, NULL },
 	{ 0x00483, 0x00489, 0, NULL, NULL },
 	{ 0x005bf, 0x005bf, 0, NULL, NULL },
 	{ 0x005c1, 0x005c2, 0, NULL, NULL },
 	{ 0x00610, 0x0061a, 0, NULL, NULL },
 	{ 0x00600, 0x00605, 0, NULL, NULL },
 	{ 0x005c7, 0x005c7, 0, NULL, NULL },
 	{ 0x0064b, 0x0065f, 0, NULL, NULL },
 	{ 0x0061c, 0x0061c, 0, NULL, NULL },
 	{ 0x00670, 0x00670, 0, NULL, NULL },
 	{ 0x007a6, 0x007b0, 0, NULL, NULL },
 	{ 0x006ea, 0x006ed, 0, NULL, NULL },
 	{ 0x006df, 0x006e4, 0, NULL, NULL },
 	{ 0x006e7, 0x006e8, 0, NULL, NULL },
 	{ 0x00711, 0x00711, 0, NULL, NULL },
 	{ 0x0070f, 0x0070f, 0, NULL, NULL },
 	{ 0x00730, 0x0074a, 0, NULL, NULL },
 	{ 0x0081b, 0x00823, 0, NULL, NULL },
 	{ 0x007eb, 0x007f3, 0, NULL, NULL },
 	{ 0x00816, 0x00819, 0, NULL, NULL },
 	{ 0x00829, 0x0082d, 0, NULL, NULL },
 	{ 0x00825, 0x00827, 0, NULL, NULL },
 	{ 0x00859, 0x0085b, 0, NULL, NULL },
 	{ 0x00a41, 0x00a42, 0, NULL, NULL },
 	{ 0x00981, 0x00981, 0, NULL, NULL },
 	{ 0x00941, 0x00948, 0, NULL, NULL },
 	{ 0x0093a, 0x0093a, 0, NULL, NULL },
 	{ 0x0093c, 0x0093c, 0, NULL, NULL },
 	{ 0x00951, 0x00957, 0, NULL, NULL },
 	{ 0x0094d, 0x0094d, 0, NULL, NULL },
 	{ 0x00962, 0x00963, 0, NULL, NULL },
 	{ 0x009e2, 0x009e3, 0, NULL, NULL },
 	{ 0x009c1, 0x009c4, 0, NULL, NULL },
 	{ 0x009bc, 0x009bc, 0, NULL, NULL },
 	{ 0x009cd, 0x009cd, 0, NULL, NULL },
 	{ 0x00a01, 0x00a02, 0, NULL, NULL },
 	{ 0x00a3c, 0x00a3c, 0, NULL, NULL },
 	{ 0x00ac1, 0x00ac5, 0, NULL, NULL },
 	{ 0x00a70, 0x00a71, 0, NULL, NULL },
 	{ 0x00a4b, 0x00a4d, 0, NULL, NULL },
 	{ 0x00a47, 0x00a48, 0, NULL, NULL },
 	{ 0x00a51, 0x00a51, 0, NULL, NULL },
 	{ 0x00a81, 0x00a82, 0, NULL, NULL },
 	{ 0x00a75, 0x00a75, 0, NULL, NULL },
 	{ 0x00abc, 0x00abc, 0, NULL, NULL },
 	{ 0x00ae2, 0x00ae3, 0, NULL, NULL },
 	{ 0x00ac7, 0x00ac8, 0, NULL, NULL },
 	{ 0x00acd, 0x00acd, 0, NULL, NULL },
 	{ 0x00b3c, 0x00b3c, 0, NULL, NULL },
 	{ 0x00b01, 0x00b01, 0, NULL, NULL },
 	{ 0x00b3f, 0x00b3f, 0, NULL, NULL },
 	{ 0x03190, 0x031ba, 2, NULL, NULL },
 	{ 0x017c9, 0x017d3, 0, NULL, NULL },
 	{ 0x00ec8, 0x00ecd, 0, NULL, NULL },
 	{ 0x00cc6, 0x00cc6, 0, NULL, NULL },
 	{ 0x00c3e, 0x00c40, 0, NULL, NULL },
 	{ 0x00b82, 0x00b82, 0, NULL, NULL },
 	{ 0x00b56, 0x00b56, 0, NULL, NULL },
 	{ 0x00b4d, 0x00b4d, 0, NULL, NULL },
 	{ 0x00b62, 0x00b63, 0, NULL, NULL },
 	{ 0x00bcd, 0x00bcd, 0, NULL, NULL },
 	{ 0x00bc0, 0x00bc0, 0, NULL, NULL },
 	{ 0x00c00, 0x00c00, 0, NULL, NULL },
 	{ 0x00c62, 0x00c63, 0, NULL, NULL },
 	{ 0x00c4a, 0x00c4d, 0, NULL, NULL },
 	{ 0x00c46, 0x00c48, 0, NULL, NULL },
 	{ 0x00c55, 0x00c56, 0, NULL, NULL },
 	{ 0x00cbc, 0x00cbc, 0, NULL, NULL },
 	{ 0x00c81, 0x00c81, 0, NULL, NULL },
 	{ 0x00cbf, 0x00cbf, 0, NULL, NULL },
 	{ 0x00dd2, 0x00dd4, 0, NULL, NULL },
 	{ 0x00d41, 0x00d44, 0, NULL, NULL },
 	{ 0x00ce2, 0x00ce3, 0, NULL, NULL },
 	{ 0x00ccc, 0x00ccd, 0, NULL, NULL },
 	{ 0x00d01, 0x00d01, 0, NULL, NULL },
 	{ 0x00d62, 0x00d63, 0, NULL, NULL },
 	{ 0x00d4d, 0x00d4d, 0, NULL, NULL },
 	{ 0x00dca, 0x00dca, 0, NULL, NULL },
 	{ 0x00e47, 0x00e4e, 0, NULL, NULL },
 	{ 0x00e31, 0x00e31, 0, NULL, NULL },
 	{ 0x00dd6, 0x00dd6, 0, NULL, NULL },
 	{ 0x00e34, 0x00e3a, 0, NULL, NULL },
 	{ 0x00eb4, 0x00eb9, 0, NULL, NULL },
 	{ 0x00eb1, 0x00eb1, 0, NULL, NULL },
 	{ 0x00ebb, 0x00ebc, 0, NULL, NULL },
 	{ 0x0105e, 0x01060, 0, NULL, NULL },
 	{ 0x00f8d, 0x00f97, 0, NULL, NULL },
 	{ 0x00f39, 0x00f39, 0, NULL, NULL },
 	{ 0x00f35, 0x00f35, 0, NULL, NULL },
 	{ 0x00f18, 0x00f19, 0, NULL, NULL },
 	{ 0x00f37, 0x00f37, 0, NULL, NULL },
 	{ 0x00f80, 0x00f84, 0, NULL, NULL },
 	{ 0x00f71, 0x00f7e, 0, NULL, NULL },
 	{ 0x00f86, 0x00f87, 0, NULL, NULL },
 	{ 0x01032, 0x01037, 0, NULL, NULL },
 	{ 0x00fc6, 0x00fc6, 0, NULL, NULL },
 	{ 0x00f99, 0x00fbc, 0, NULL, NULL },
 	{ 0x0102d, 0x01030, 0, NULL, NULL },
 	{ 0x0103d, 0x0103e, 0, NULL, NULL },
 	{ 0x01039, 0x0103a, 0, NULL, NULL },
 	{ 0x01058, 0x01059, 0, NULL, NULL },
 	{ 0x0135d, 0x0135f, 0, NULL, NULL },
 	{ 0x01085, 0x01086, 0, NULL, NULL },
 	{ 0x01071, 0x01074, 0, NULL, NULL },
 	{ 0x01082, 0x01082, 0, NULL, NULL },
 	{ 0x0109d, 0x0109d, 0, NULL, NULL },
 	{ 0x0108d, 0x0108d, 0, NULL, NULL },
 	{ 0x01100, 0x011ff, 2, NULL, NULL },
 	{ 0x01772, 0x01773, 0, NULL, NULL },
 	{ 0x01732, 0x01734, 0, NULL, NULL },
 	{ 0x01712, 0x01714, 0, NULL, NULL },
 	{ 0x01752, 0x01753, 0, NULL, NULL },
 	{ 0x017b7, 0x017bd, 0, NULL, NULL },
 	{ 0x017b4, 0x017b5, 0, NULL, NULL },
 	{ 0x017c6, 0x017c6, 0, NULL, NULL },
 	{ 0x01c2c, 0x01c33, 0, NULL, NULL },
 	{ 0x01a7f, 0x01a7f, 0, NULL, NULL },
 	{ 0x01a17, 0x01a18, 0, NULL, NULL },
 	{ 0x01920, 0x01922, 0, NULL, NULL },
 	{ 0x0180b, 0x0180e, 0, NULL, NULL },
 	{ 0x017dd, 0x017dd, 0, NULL, NULL },
 	{ 0x018a9, 0x018a9, 0, NULL, NULL },
 	{ 0x01932, 0x01932, 0, NULL, NULL },
 	{ 0x01927, 0x01928, 0, NULL, NULL },
 	{ 0x01939, 0x0193b, 0, NULL, NULL },
 	{ 0x01a60, 0x01a60, 0, NULL, NULL },
 	{ 0x01a56, 0x01a56, 0, NULL, NULL },
 	{ 0x01a1b, 0x01a1b, 0, NULL, NULL },
 	{ 0x01a58, 0x01a5e, 0, NULL, NULL },
 	{ 0x01a65, 0x01a6c, 0, NULL, NULL },
 	{ 0x01a62, 0x01a62, 0, NULL, NULL },
 	{ 0x01a73, 0x01a7c, 0, NULL, NULL },
 	{ 0x01b80, 0x01b81, 0, NULL, NULL },
 	{ 0x01b36, 0x01b3a, 0, NULL, NULL },
 	{ 0x01b00, 0x01b03, 0, NULL, NULL },
 	{ 0x01ab0, 0x01abe, 0, NULL, NULL },
 	{ 0x01b34, 0x01b34, 0, NULL, NULL },
 	{ 0x01b42, 0x01b42, 0, NULL, NULL },
 	{ 0x01b3c, 0x01b3c, 0, NULL, NULL },
 	{ 0x01b6b, 0x01b73, 0, NULL, NULL },
 	{ 0x01be6, 0x01be6, 0, NULL, NULL },
 	{ 0x01ba8, 0x01ba9, 0, NULL, NULL },
 	{ 0x01ba2, 0x01ba5, 0, NULL, NULL },
 	{ 0x01bab, 0x01bad, 0, NULL, NULL },
 	{ 0x01bed, 0x01bed, 0, NULL, NULL },
 	{ 0x01be8, 0x01be9, 0, NULL, NULL },
 	{ 0x01bef, 0x01bf1, 0, NULL, NULL },
 	{ 0x02329, 0x0232a, 2, NULL, NULL },
 	{ 0x01dc0, 0x01df5, 0, NULL, NULL },
 	{ 0x01ce2, 0x01ce8, 0, NULL, NULL },
 	{ 0x01cd0, 0x01cd2, 0, NULL, NULL },
 	{ 0x01c36, 0x01c37, 0, NULL, NULL },
 	{ 0x01cd4, 0x01ce0, 0, NULL, NULL },
 	{ 0x01cf4, 0x01cf4, 0, NULL, NULL },
 	{ 0x01ced, 0x01ced, 0, NULL, NULL },
 	{ 0x01cf8, 0x01cf9, 0, NULL, NULL },
 	{ 0x02060, 0x02064, 0, NULL, NULL },
 	{ 0x0200b, 0x0200f, 0, NULL, NULL },
 	{ 0x01dfc, 0x01dff, 0, NULL, NULL },
 	{ 0x0202a, 0x0202e, 0, NULL, NULL },
 	{ 0x02066, 0x0206f, 0, NULL, NULL },
 	{ 0x020d0, 0x020f0, 0, NULL, NULL },
 	{ 0x03001, 0x03029, 2, NULL, NULL },
 	{ 0x02e80, 0x02e99, 2, NULL, NULL },
 	{ 0x02d7f, 0x02d7f, 0, NULL, NULL },
 	{ 0x02cef, 0x02cf1, 0, NULL, NULL },
 	{ 0x02de0, 0x02dff, 0, NULL, NULL },
 	{ 0x02f00, 0x02fd5, 2, NULL, NULL },
 	{ 0x02e9b, 0x02ef3, 2, NULL, NULL },
 	{ 0x02ff0, 0x02ffb, 2, NULL, NULL },
 	{ 0x03099, 0x0309a, 0, NULL, NULL },
 	{ 0x0302e, 0x0303e, 2, NULL, NULL },
 	{ 0x0302a, 0x0302d, 0, NULL, NULL },
 	{ 0x03041, 0x03096, 2, NULL, NULL },
 	{ 0x03105, 0x0312d, 2, NULL, NULL },
 	{ 0x0309b, 0x030ff, 2, NULL, NULL },
 	{ 0x03131, 0x0318e, 2, NULL, NULL },
 	{ 0x10a3f, 0x10a3f, 0, NULL, NULL },
 	{ 0x0aa4c, 0x0aa4c, 0, NULL, NULL },
 	{ 0x0a825, 0x0a826, 0, NULL, NULL },
 	{ 0x0a490, 0x0a4c6, 2, NULL, NULL },
 	{ 0x03250, 0x032fe, 2, NULL, NULL },
 	{ 0x031f0, 0x0321e, 2, NULL, NULL },
 	{ 0x031c0, 0x031e3, 2, NULL, NULL },
 	{ 0x03220, 0x03247, 2, NULL, NULL },
 	{ 0x04e00, 0x09fcc, 2, NULL, NULL },
 	{ 0x03300, 0x04db5, 2, NULL, NULL },
 	{ 0x0a000, 0x0a48c, 2, NULL, NULL },
 	{ 0x0a6f0, 0x0a6f1, 0, NULL, NULL },
 	{ 0x0a674, 0x0a67d, 0, NULL, NULL },
 	{ 0x0a66f, 0x0a672, 0, NULL, NULL },
 	{ 0x0a69f, 0x0a69f, 0, NULL, NULL },
 	{ 0x0a806, 0x0a806, 0, NULL, NULL },
 	{ 0x0a802, 0x0a802, 0, NULL, NULL },
 	{ 0x0a80b, 0x0a80b, 0, NULL, NULL },
 	{ 0x0a9b6, 0x0a9b9, 0, NULL, NULL },
 	{ 0x0a947, 0x0a951, 0, NULL, NULL },
 	{ 0x0a8e0, 0x0a8f1, 0, NULL, NULL },
 	{ 0x0a8c4, 0x0a8c4, 0, NULL, NULL },
 	{ 0x0a926, 0x0a92d, 0, NULL, NULL },
 	{ 0x0a980, 0x0a982, 0, NULL, NULL },
 	{ 0x0a960, 0x0a97c, 2, NULL, NULL },
 	{ 0x0a9b3, 0x0a9b3, 0, NULL, NULL },
 	{ 0x0aa29, 0x0aa2e, 0, NULL, NULL },
 	{ 0x0a9bc, 0x0a9bc, 0, NULL, NULL },
 	{ 0x0a9e5, 0x0a9e5, 0, NULL, NULL },
 	{ 0x0aa35, 0x0aa36, 0, NULL, NULL },
 	{ 0x0aa31, 0x0aa32, 0, NULL, NULL },
 	{ 0x0aa43, 0x0aa43, 0, NULL, NULL },
 	{ 0x0fb1e, 0x0fb1e, 0, NULL, NULL },
 	{ 0x0aaf6, 0x0aaf6, 0, NULL, NULL },
 	{ 0x0aab7, 0x0aab8, 0, NULL, NULL },
 	{ 0x0aab0, 0x0aab0, 0, NULL, NULL },
 	{ 0x0aa7c, 0x0aa7c, 0, NULL, NULL },
 	{ 0x0aab2, 0x0aab4, 0, NULL, NULL },
 	{ 0x0aac1, 0x0aac1, 0, NULL, NULL },
 	{ 0x0aabe, 0x0aabf, 0, NULL, NULL },
 	{ 0x0aaec, 0x0aaed, 0, NULL, NULL },
 	{ 0x0ac00, 0x0d7a3, 2, NULL, NULL },
 	{ 0x0abe8, 0x0abe8, 0, NULL, NULL },
 	{ 0x0abe5, 0x0abe5, 0, NULL, NULL },
 	{ 0x0abed, 0x0abed, 0, NULL, NULL },
 	{ 0x0f900, 0x0fa6d, 2, NULL, NULL },
 	{ 0x0d800, 0x0f8ff, 0, NULL, NULL },
 	{ 0x0fa70, 0x0fad9, 2, NULL, NULL },
 	{ 0x0fff9, 0x0fffb, 0, NULL, NULL },
 	{ 0x0fe30, 0x0fe52, 2, NULL, NULL },
 	{ 0x0fe10, 0x0fe19, 2, NULL, NULL },
 	{ 0x0fe00, 0x0fe0f, 0, NULL, NULL },
 	{ 0x0fe20, 0x0fe2d, 0, NULL, NULL },
 	{ 0x0fe68, 0x0fe6b, 2, NULL, NULL },
 	{ 0x0fe54, 0x0fe66, 2, NULL, NULL },
 	{ 0x0feff, 0x0feff, 0, NULL, NULL },
 	{ 0x10a01, 0x10a03, 0, NULL, NULL },
 	{ 0x102e0, 0x102e0, 0, NULL, NULL },
 	{ 0x101fd, 0x101fd, 0, NULL, NULL },
 	{ 0x10376, 0x1037a, 0, NULL, NULL },
 	{ 0x10a0c, 0x10a0f, 0, NULL, NULL },
 	{ 0x10a05, 0x10a06, 0, NULL, NULL },
 	{ 0x10a38, 0x10a3a, 0, NULL, NULL },
 	{ 0x11633, 0x1163a, 0, NULL, NULL },
 	{ 0x11236, 0x11237, 0, NULL, NULL },
 	{ 0x11100, 0x11102, 0, NULL, NULL },
 	{ 0x1107f, 0x11081, 0, NULL, NULL },
 	{ 0x11001, 0x11001, 0, NULL, NULL },
 	{ 0x10ae5, 0x10ae6, 0, NULL, NULL },
 	{ 0x11038, 0x11046, 0, NULL, NULL },
 	{ 0x110b9, 0x110ba, 0, NULL, NULL },
 	{ 0x110b3, 0x110b6, 0, NULL, NULL },
 	{ 0x110bd, 0x110bd, 0, NULL, NULL },
 	{ 0x11180, 0x11181, 0, NULL, NULL },
 	{ 0x1112d, 0x11134, 0, NULL, NULL },
 	{ 0x11127, 0x1112b, 0, NULL, NULL },
 	{ 0x11173, 0x11173, 0, NULL, NULL },
 	{ 0x1122f, 0x11231, 0, NULL, NULL },
 	{ 0x111b6, 0x111be, 0, NULL, NULL },
 	{ 0x11234, 0x11234, 0, NULL, NULL },
 	{ 0x11370, 0x11374, 0, NULL, NULL },
 	{ 0x11301, 0x11301, 0, NULL, NULL },
 	{ 0x112df, 0x112df, 0, NULL, NULL },
 	{ 0x112e3, 0x112ea, 0, NULL, NULL },
 	{ 0x11340, 0x11340, 0, NULL, NULL },
 	{ 0x1133c, 0x1133c, 0, NULL, NULL },
 	{ 0x11366, 0x1136c, 0, NULL, NULL },
 	{ 0x114c2, 0x114c3, 0, NULL, NULL },
 	{ 0x114ba, 0x114ba, 0, NULL, NULL },
 	{ 0x114b3, 0x114b8, 0, NULL, NULL },
 	{ 0x114bf, 0x114c0, 0, NULL, NULL },
 	{ 0x115bc, 0x115bd, 0, NULL, NULL },
 	{ 0x115b2, 0x115b5, 0, NULL, NULL },
 	{ 0x115bf, 0x115c0, 0, NULL, NULL },
 	{ 0x1d1aa, 0x1d1ad, 0, NULL, NULL },
 	{ 0x16b30, 0x16b36, 0, NULL, NULL },
 	{ 0x116ad, 0x116ad, 0, NULL, NULL },
 	{ 0x1163f, 0x11640, 0, NULL, NULL },
 	{ 0x1163d, 0x1163d, 0, NULL, NULL },
 	{ 0x116ab, 0x116ab, 0, NULL, NULL },
 	{ 0x116b7, 0x116b7, 0, NULL, NULL },
 	{ 0x116b0, 0x116b5, 0, NULL, NULL },
 	{ 0x16af0, 0x16af4, 0, NULL, NULL },
 	{ 0x1bca0, 0x1bca3, 0, NULL, NULL },
 	{ 0x1b000, 0x1b001, 2, NULL, NULL },
 	{ 0x16f8f, 0x16f92, 0, NULL, NULL },
 	{ 0x1bc9d, 0x1bc9e, 0, NULL, NULL },
 	{ 0x1d173, 0x1d182, 0, NULL, NULL },
 	{ 0x1d167, 0x1d169, 0, NULL, NULL },
 	{ 0x1d185, 0x1d18b, 0, NULL, NULL },
 	{ 0x2a700, 0x2b734, 2, NULL, NULL },
 	{ 0x1f210, 0x1f23a, 2, NULL, NULL },
 	{ 0x1e8d0, 0x1e8d6, 0, NULL, NULL },
 	{ 0x1d242, 0x1d244, 0, NULL, NULL },
 	{ 0x1f200, 0x1f202, 2, NULL, NULL },
 	{ 0x1f250, 0x1f251, 2, NULL, NULL },
 	{ 0x1f240, 0x1f248, 2, NULL, NULL },
 	{ 0x20000, 0x2a6d6, 2, NULL, NULL },
 	{ 0xe0020, 0xe007f, 0, NULL, NULL },
 	{ 0x2f800, 0x2fa1d, 2, NULL, NULL },
 	{ 0x2b740, 0x2b81d, 2, NULL, NULL },
 	{ 0xe0001, 0xe0001, 0, NULL, NULL },
 	{ 0xf0000, 0xffffd, 0, NULL, NULL },
 	{ 0xe0100, 0xe01ef, 0, NULL, NULL },
 	{ 0x100000, 0x10fffd, 0, NULL, NULL },
 };

 struct utf8_width_entry	*utf8_width_root = NULL;

 int	utf8_overlap(struct utf8_width_entry *, struct utf8_width_entry *);
 u_int	utf8_combine(const struct utf8_data *);
 u_int	utf8_width(const struct utf8_data *);

 /* Set a single character. */
 void
 utf8_set(struct utf8_data *utf8data, u_char ch)
 {
 	*utf8data->data = ch;
 	utf8data->size = 1;

 	utf8data->width = 1;
 }

 /*
  * Open UTF-8 sequence.
  *
  * 11000010-11011111 C2-DF start of 2-byte sequence
  * 11100000-11101111 E0-EF start of 3-byte sequence
  * 11110000-11110100 F0-F4 start of 4-byte sequence
  *
  * Returns 1 if more UTF-8 to come, 0 if not UTF-8.
  */
 int
 utf8_open(struct utf8_data *utf8data, u_char ch)
 {
 	memset(utf8data, 0, sizeof *utf8data);
 	if (ch >= 0xc2 && ch <= 0xdf)
 		utf8data->size = 2;
 	else if (ch >= 0xe0 && ch <= 0xef)
 		utf8data->size = 3;
 	else if (ch >= 0xf0 && ch <= 0xf4)
 		utf8data->size = 4;
 	else
 		return (0);
 	utf8_append(utf8data, ch);
 	return (1);
 }

 /*
  * Append character to UTF-8, closing if finished.
  *
  * Returns 1 if more UTF-8 data to come, 0 if finished.
  */
 int
 utf8_append(struct utf8_data *utf8data, u_char ch)
 {
 	if (utf8data->have >= utf8data->size)
 		fatalx("UTF-8 character overflow");
 	if (utf8data->size > sizeof utf8data->data)
 		fatalx("UTF-8 character size too large");

 	utf8data->data[utf8data->have++] = ch;
 	if (utf8data->have != utf8data->size)
 		return (1);

 	utf8data->width = utf8_width(utf8data);
 	return (0);
 }

 /* Check if two width tree entries overlap. */
 int
 utf8_overlap(struct utf8_width_entry *item1, struct utf8_width_entry *item2)
 {
 	if (item1->first >= item2->first && item1->first <= item2->last)
 		return (1);
 	if (item1->last >= item2->first && item1->last <= item2->last)
 		return (1);
 	if (item2->first >= item1->first && item2->first <= item1->last)
 		return (1);
 	if (item2->last >= item1->first && item2->last <= item1->last)
 		return (1);
 	return (0);
 }

 /* Build UTF-8 width tree. */
 void
 utf8_build(void)
 {
 	struct utf8_width_entry	**ptr, *item, *node;
 	u_int			  i, j;

 	for (i = 0; i < nitems(utf8_width_table); i++) {
 		item = &utf8_width_table[i];

 		for (j = 0; j < nitems(utf8_width_table); j++) {
 			if (i != j && utf8_overlap(item, &utf8_width_table[j]))
 				log_fatalx("utf8 overlap: %u %u", i, j);
 		}

 		ptr = &utf8_width_root;
 		while (*ptr != NULL) {
 			node = *ptr;
 			if (item->last < node->first)
 				ptr = &node->left;
 			else if (item->first > node->last)
 				ptr = &node->right;
 		}
 		*ptr = item;
 	}
 }

 /* Combine UTF-8 into 32-bit Unicode. */
 u_int
 utf8_combine(const struct utf8_data *utf8data)
 {
 	u_int	value;

 	value = 0xff;
 	switch (utf8data->size) {
 	case 1:
 		value = utf8data->data[0];
 		break;
 	case 2:
 		value = utf8data->data[1] & 0x3f;
 		value |= (utf8data->data[0] & 0x1f) << 6;
 		break;
 	case 3:
 		value = utf8data->data[2] & 0x3f;
 		value |= (utf8data->data[1] & 0x3f) << 6;
 		value |= (utf8data->data[0] & 0x0f) << 12;
 		break;
 	case 4:
 		value = utf8data->data[3] & 0x3f;
 		value |= (utf8data->data[2] & 0x3f) << 6;
 		value |= (utf8data->data[1] & 0x3f) << 12;
 		value |= (utf8data->data[0] & 0x07) << 18;
 		break;
 	}
 	return (value);
 }

 /* Split a two-byte UTF-8 character. */
 u_int
 utf8_split2(u_int uc, u_char *ptr)
 {
 	if (uc > 0x7f) {
 		ptr[0] = (uc >> 6) | 0xc0;
 		ptr[1] = (uc & 0x3f) | 0x80;
 		return (2);
 	}
 	ptr[0] = uc;
 	return (1);
 }

 /* Lookup width of UTF-8 data in tree. */
 u_int
 utf8_width(const struct utf8_data *utf8data)
 {
 	struct utf8_width_entry	*item;
 	u_int			 value;

 	value = utf8_combine(utf8data);

 	item = utf8_width_root;
 	while (item != NULL) {
 		if (value < item->first)
 			item = item->left;
 		else if (value > item->last)
 			item = item->right;
 		else
 			return (item->width);
 	}
 	return (1);
 }

 /*
  * Encode len characters from src into dst, which is guaranteed to have four
  * bytes available for each character from src (for \abc or UTF-8) plus space
  * for \0.
  */
 int
 utf8_strvis(char *dst, const char *src, size_t len, int flag)
 {
 	struct utf8_data	 utf8data;
 	const char		*start, *end;
 	int			 more;
 	size_t			 i;

 	start = dst;
 	end = src + len;

 	while (src < end) {
 		if (utf8_open(&utf8data, *src)) {
 			more = 1;
 			while (++src < end && more)
 				more = utf8_append(&utf8data, *src);
 			if (!more) {
 				/* UTF-8 character finished. */
 				for (i = 0; i < utf8data.size; i++)
 					*dst++ = utf8data.data[i];
 				continue;
 			} else if (utf8data.have > 0) {
 				/* Not a complete UTF-8 character. */
 				src -= utf8data.have;
 			}
 		}
 		if (src < end - 1)
 			dst = vis(dst, src[0], flag, src[1]);
 		else if (src < end)
 			dst = vis(dst, src[0], flag, '\0');
 		src++;
 	}

 	*dst = '\0';
 	return (dst - start);
 }

 /*
  * Convert a string into a buffer of UTF-8 characters. Terminated by size == 0.
  * Caller frees.
  */
 struct utf8_data *
 utf8_fromcstr(const char *src)
 {
 	struct utf8_data	*dst;
 	size_t			 n;
 	int			 more;

 	dst = NULL;

 	n = 0;
 	while (*src != '\0') {
 		dst = xreallocarray(dst, n + 1, sizeof *dst);
 		if (utf8_open(&dst[n], *src)) {
 			more = 1;
 			while (*++src != '\0' && more)
 				more = utf8_append(&dst[n], *src);
 			if (!more) {
 				n++;
 				continue;
 			}
 			src -= dst[n].have;
 		}
 		utf8_set(&dst[n], *src);
 		src++;

 		n++;
 	}

 	dst = xreallocarray(dst, n + 1, sizeof *dst);
 	dst[n].size = 0;
 	return (dst);
 }

 /* Convert from a buffer of UTF-8 characters into a string. Caller frees. */
 char *
 utf8_tocstr(struct utf8_data *src)
 {
 	char	*dst;
 	size_t	 n;

 	dst = NULL;

 	n = 0;
 	for(; src->size != 0; src++) {
 		dst = xreallocarray(dst, n + src->size, 1);
 		memcpy(dst + n, src->data, src->size);
 		n += src->size;
 	}

 	dst = xreallocarray(dst, n + 1, 1);
 	dst[n] = '\0';
 	return (dst);
 }

 /* Get width of UTF-8 string. */
 u_int
 utf8_cstrwidth(const char *s)
 {
 	struct utf8_data	tmp;
 	u_int			width;
 	int			more;

 	width = 0;
 	while (*s != '\0') {
 		if (utf8_open(&tmp, *s)) {
 			more = 1;
 			while (*++s != '\0' && more)
 				more = utf8_append(&tmp, *s);
 			if (!more) {
 				width += tmp.width;
 				continue;
 			}
 			s -= tmp.have;
 		}
 		width++;
 		s++;
 	}
 	return (width);
 }

 /* Trim UTF-8 string to width. Caller frees. */
 char *
 utf8_trimcstr(const char *s, u_int width)
 {
 	struct utf8_data	*tmp, *next;
 	char			*out;
 	u_int			 at;

 	tmp = utf8_fromcstr(s);

 	at = 0;
 	for (next = tmp; next->size != 0; next++) {
 		if (at + next->width > width) {
 			next->size = 0;
 			break;
 		}
 		at += next->width;
 	}

 	out = utf8_tocstr(tmp);
 	free(tmp);
 	return (out);
 }
	/* $OpenBSD$ */

	/*
	* 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 <stdlib.h>
	#include <string.h>

	#include "tmux.h"

	struct utf8_width_entry {
	u_int first;
	u_int last;

	int width;

	struct utf8_width_entry *left;
	struct utf8_width_entry *right;
	};

	/* Sorted, then repeatedly split in the middle to balance the tree. */
	struct utf8_width_entry utf8_width_table[] = {
	{ 0x00b41, 0x00b44, 0, NULL, NULL },
	{ 0x008e4, 0x00902, 0, NULL, NULL },
	{ 0x006d6, 0x006dd, 0, NULL, NULL },
	{ 0x005c4, 0x005c5, 0, NULL, NULL },
	{ 0x00591, 0x005bd, 0, NULL, NULL },
	{ 0x00300, 0x0036f, 0, NULL, NULL },
	{ 0x00483, 0x00489, 0, NULL, NULL },
	{ 0x005bf, 0x005bf, 0, NULL, NULL },
	{ 0x005c1, 0x005c2, 0, NULL, NULL },
	{ 0x00610, 0x0061a, 0, NULL, NULL },
	{ 0x00600, 0x00605, 0, NULL, NULL },
	{ 0x005c7, 0x005c7, 0, NULL, NULL },
	{ 0x0064b, 0x0065f, 0, NULL, NULL },
	{ 0x0061c, 0x0061c, 0, NULL, NULL },
	{ 0x00670, 0x00670, 0, NULL, NULL },
	{ 0x007a6, 0x007b0, 0, NULL, NULL },
	{ 0x006ea, 0x006ed, 0, NULL, NULL },
	{ 0x006df, 0x006e4, 0, NULL, NULL },
	{ 0x006e7, 0x006e8, 0, NULL, NULL },
	{ 0x00711, 0x00711, 0, NULL, NULL },
	{ 0x0070f, 0x0070f, 0, NULL, NULL },
	{ 0x00730, 0x0074a, 0, NULL, NULL },
	{ 0x0081b, 0x00823, 0, NULL, NULL },
	{ 0x007eb, 0x007f3, 0, NULL, NULL },
	{ 0x00816, 0x00819, 0, NULL, NULL },
	{ 0x00829, 0x0082d, 0, NULL, NULL },
	{ 0x00825, 0x00827, 0, NULL, NULL },
	{ 0x00859, 0x0085b, 0, NULL, NULL },
	{ 0x00a41, 0x00a42, 0, NULL, NULL },
	{ 0x00981, 0x00981, 0, NULL, NULL },
	{ 0x00941, 0x00948, 0, NULL, NULL },
	{ 0x0093a, 0x0093a, 0, NULL, NULL },
	{ 0x0093c, 0x0093c, 0, NULL, NULL },
	{ 0x00951, 0x00957, 0, NULL, NULL },
	{ 0x0094d, 0x0094d, 0, NULL, NULL },
	{ 0x00962, 0x00963, 0, NULL, NULL },
	{ 0x009e2, 0x009e3, 0, NULL, NULL },
	{ 0x009c1, 0x009c4, 0, NULL, NULL },
	{ 0x009bc, 0x009bc, 0, NULL, NULL },
	{ 0x009cd, 0x009cd, 0, NULL, NULL },
	{ 0x00a01, 0x00a02, 0, NULL, NULL },
	{ 0x00a3c, 0x00a3c, 0, NULL, NULL },
	{ 0x00ac1, 0x00ac5, 0, NULL, NULL },
	{ 0x00a70, 0x00a71, 0, NULL, NULL },
	{ 0x00a4b, 0x00a4d, 0, NULL, NULL },
	{ 0x00a47, 0x00a48, 0, NULL, NULL },
	{ 0x00a51, 0x00a51, 0, NULL, NULL },
	{ 0x00a81, 0x00a82, 0, NULL, NULL },
	{ 0x00a75, 0x00a75, 0, NULL, NULL },
	{ 0x00abc, 0x00abc, 0, NULL, NULL },
	{ 0x00ae2, 0x00ae3, 0, NULL, NULL },
	{ 0x00ac7, 0x00ac8, 0, NULL, NULL },
	{ 0x00acd, 0x00acd, 0, NULL, NULL },
	{ 0x00b3c, 0x00b3c, 0, NULL, NULL },
	{ 0x00b01, 0x00b01, 0, NULL, NULL },
	{ 0x00b3f, 0x00b3f, 0, NULL, NULL },
	{ 0x03190, 0x031ba, 2, NULL, NULL },
	{ 0x017c9, 0x017d3, 0, NULL, NULL },
	{ 0x00ec8, 0x00ecd, 0, NULL, NULL },
	{ 0x00cc6, 0x00cc6, 0, NULL, NULL },
	{ 0x00c3e, 0x00c40, 0, NULL, NULL },
	{ 0x00b82, 0x00b82, 0, NULL, NULL },
	{ 0x00b56, 0x00b56, 0, NULL, NULL },
	{ 0x00b4d, 0x00b4d, 0, NULL, NULL },
	{ 0x00b62, 0x00b63, 0, NULL, NULL },
	{ 0x00bcd, 0x00bcd, 0, NULL, NULL },
	{ 0x00bc0, 0x00bc0, 0, NULL, NULL },
	{ 0x00c00, 0x00c00, 0, NULL, NULL },
	{ 0x00c62, 0x00c63, 0, NULL, NULL },
	{ 0x00c4a, 0x00c4d, 0, NULL, NULL },
	{ 0x00c46, 0x00c48, 0, NULL, NULL },
	{ 0x00c55, 0x00c56, 0, NULL, NULL },
	{ 0x00cbc, 0x00cbc, 0, NULL, NULL },
	{ 0x00c81, 0x00c81, 0, NULL, NULL },
	{ 0x00cbf, 0x00cbf, 0, NULL, NULL },
	{ 0x00dd2, 0x00dd4, 0, NULL, NULL },
	{ 0x00d41, 0x00d44, 0, NULL, NULL },
	{ 0x00ce2, 0x00ce3, 0, NULL, NULL },
	{ 0x00ccc, 0x00ccd, 0, NULL, NULL },
	{ 0x00d01, 0x00d01, 0, NULL, NULL },
	{ 0x00d62, 0x00d63, 0, NULL, NULL },
	{ 0x00d4d, 0x00d4d, 0, NULL, NULL },
	{ 0x00dca, 0x00dca, 0, NULL, NULL },
	{ 0x00e47, 0x00e4e, 0, NULL, NULL },
	{ 0x00e31, 0x00e31, 0, NULL, NULL },
	{ 0x00dd6, 0x00dd6, 0, NULL, NULL },
	{ 0x00e34, 0x00e3a, 0, NULL, NULL },
	{ 0x00eb4, 0x00eb9, 0, NULL, NULL },
	{ 0x00eb1, 0x00eb1, 0, NULL, NULL },
	{ 0x00ebb, 0x00ebc, 0, NULL, NULL },
	{ 0x0105e, 0x01060, 0, NULL, NULL },
	{ 0x00f8d, 0x00f97, 0, NULL, NULL },
	{ 0x00f39, 0x00f39, 0, NULL, NULL },
	{ 0x00f35, 0x00f35, 0, NULL, NULL },
	{ 0x00f18, 0x00f19, 0, NULL, NULL },
	{ 0x00f37, 0x00f37, 0, NULL, NULL },
	{ 0x00f80, 0x00f84, 0, NULL, NULL },
	{ 0x00f71, 0x00f7e, 0, NULL, NULL },
	{ 0x00f86, 0x00f87, 0, NULL, NULL },
	{ 0x01032, 0x01037, 0, NULL, NULL },
	{ 0x00fc6, 0x00fc6, 0, NULL, NULL },
	{ 0x00f99, 0x00fbc, 0, NULL, NULL },
	{ 0x0102d, 0x01030, 0, NULL, NULL },
	{ 0x0103d, 0x0103e, 0, NULL, NULL },
	{ 0x01039, 0x0103a, 0, NULL, NULL },
	{ 0x01058, 0x01059, 0, NULL, NULL },
	{ 0x0135d, 0x0135f, 0, NULL, NULL },
	{ 0x01085, 0x01086, 0, NULL, NULL },
	{ 0x01071, 0x01074, 0, NULL, NULL },
	{ 0x01082, 0x01082, 0, NULL, NULL },
	{ 0x0109d, 0x0109d, 0, NULL, NULL },
	{ 0x0108d, 0x0108d, 0, NULL, NULL },
	{ 0x01100, 0x011ff, 2, NULL, NULL },
	{ 0x01772, 0x01773, 0, NULL, NULL },
	{ 0x01732, 0x01734, 0, NULL, NULL },
	{ 0x01712, 0x01714, 0, NULL, NULL },
	{ 0x01752, 0x01753, 0, NULL, NULL },
	{ 0x017b7, 0x017bd, 0, NULL, NULL },
	{ 0x017b4, 0x017b5, 0, NULL, NULL },
	{ 0x017c6, 0x017c6, 0, NULL, NULL },
	{ 0x01c2c, 0x01c33, 0, NULL, NULL },
	{ 0x01a7f, 0x01a7f, 0, NULL, NULL },
	{ 0x01a17, 0x01a18, 0, NULL, NULL },
	{ 0x01920, 0x01922, 0, NULL, NULL },
	{ 0x0180b, 0x0180e, 0, NULL, NULL },
	{ 0x017dd, 0x017dd, 0, NULL, NULL },
	{ 0x018a9, 0x018a9, 0, NULL, NULL },
	{ 0x01932, 0x01932, 0, NULL, NULL },
	{ 0x01927, 0x01928, 0, NULL, NULL },
	{ 0x01939, 0x0193b, 0, NULL, NULL },
	{ 0x01a60, 0x01a60, 0, NULL, NULL },
	{ 0x01a56, 0x01a56, 0, NULL, NULL },
	{ 0x01a1b, 0x01a1b, 0, NULL, NULL },
	{ 0x01a58, 0x01a5e, 0, NULL, NULL },
	{ 0x01a65, 0x01a6c, 0, NULL, NULL },
	{ 0x01a62, 0x01a62, 0, NULL, NULL },
	{ 0x01a73, 0x01a7c, 0, NULL, NULL },
	{ 0x01b80, 0x01b81, 0, NULL, NULL },
	{ 0x01b36, 0x01b3a, 0, NULL, NULL },
	{ 0x01b00, 0x01b03, 0, NULL, NULL },
	{ 0x01ab0, 0x01abe, 0, NULL, NULL },
	{ 0x01b34, 0x01b34, 0, NULL, NULL },
	{ 0x01b42, 0x01b42, 0, NULL, NULL },
	{ 0x01b3c, 0x01b3c, 0, NULL, NULL },
	{ 0x01b6b, 0x01b73, 0, NULL, NULL },
	{ 0x01be6, 0x01be6, 0, NULL, NULL },
	{ 0x01ba8, 0x01ba9, 0, NULL, NULL },
	{ 0x01ba2, 0x01ba5, 0, NULL, NULL },
	{ 0x01bab, 0x01bad, 0, NULL, NULL },
	{ 0x01bed, 0x01bed, 0, NULL, NULL },
	{ 0x01be8, 0x01be9, 0, NULL, NULL },
	{ 0x01bef, 0x01bf1, 0, NULL, NULL },
	{ 0x02329, 0x0232a, 2, NULL, NULL },
	{ 0x01dc0, 0x01df5, 0, NULL, NULL },
	{ 0x01ce2, 0x01ce8, 0, NULL, NULL },
	{ 0x01cd0, 0x01cd2, 0, NULL, NULL },
	{ 0x01c36, 0x01c37, 0, NULL, NULL },
	{ 0x01cd4, 0x01ce0, 0, NULL, NULL },
	{ 0x01cf4, 0x01cf4, 0, NULL, NULL },
	{ 0x01ced, 0x01ced, 0, NULL, NULL },
	{ 0x01cf8, 0x01cf9, 0, NULL, NULL },
	{ 0x02060, 0x02064, 0, NULL, NULL },
	{ 0x0200b, 0x0200f, 0, NULL, NULL },
	{ 0x01dfc, 0x01dff, 0, NULL, NULL },
	{ 0x0202a, 0x0202e, 0, NULL, NULL },
	{ 0x02066, 0x0206f, 0, NULL, NULL },
	{ 0x020d0, 0x020f0, 0, NULL, NULL },
	{ 0x03001, 0x03029, 2, NULL, NULL },
	{ 0x02e80, 0x02e99, 2, NULL, NULL },
	{ 0x02d7f, 0x02d7f, 0, NULL, NULL },
	{ 0x02cef, 0x02cf1, 0, NULL, NULL },
	{ 0x02de0, 0x02dff, 0, NULL, NULL },
	{ 0x02f00, 0x02fd5, 2, NULL, NULL },
	{ 0x02e9b, 0x02ef3, 2, NULL, NULL },
	{ 0x02ff0, 0x02ffb, 2, NULL, NULL },
	{ 0x03099, 0x0309a, 0, NULL, NULL },
	{ 0x0302e, 0x0303e, 2, NULL, NULL },
	{ 0x0302a, 0x0302d, 0, NULL, NULL },
	{ 0x03041, 0x03096, 2, NULL, NULL },
	{ 0x03105, 0x0312d, 2, NULL, NULL },
	{ 0x0309b, 0x030ff, 2, NULL, NULL },
	{ 0x03131, 0x0318e, 2, NULL, NULL },
	{ 0x10a3f, 0x10a3f, 0, NULL, NULL },
	{ 0x0aa4c, 0x0aa4c, 0, NULL, NULL },
	{ 0x0a825, 0x0a826, 0, NULL, NULL },
	{ 0x0a490, 0x0a4c6, 2, NULL, NULL },
	{ 0x03250, 0x032fe, 2, NULL, NULL },
	{ 0x031f0, 0x0321e, 2, NULL, NULL },
	{ 0x031c0, 0x031e3, 2, NULL, NULL },
	{ 0x03220, 0x03247, 2, NULL, NULL },
	{ 0x04e00, 0x09fcc, 2, NULL, NULL },
	{ 0x03300, 0x04db5, 2, NULL, NULL },
	{ 0x0a000, 0x0a48c, 2, NULL, NULL },
	{ 0x0a6f0, 0x0a6f1, 0, NULL, NULL },
	{ 0x0a674, 0x0a67d, 0, NULL, NULL },
	{ 0x0a66f, 0x0a672, 0, NULL, NULL },
	{ 0x0a69f, 0x0a69f, 0, NULL, NULL },
	{ 0x0a806, 0x0a806, 0, NULL, NULL },
	{ 0x0a802, 0x0a802, 0, NULL, NULL },
	{ 0x0a80b, 0x0a80b, 0, NULL, NULL },
	{ 0x0a9b6, 0x0a9b9, 0, NULL, NULL },
	{ 0x0a947, 0x0a951, 0, NULL, NULL },
	{ 0x0a8e0, 0x0a8f1, 0, NULL, NULL },
	{ 0x0a8c4, 0x0a8c4, 0, NULL, NULL },
	{ 0x0a926, 0x0a92d, 0, NULL, NULL },
	{ 0x0a980, 0x0a982, 0, NULL, NULL },
	{ 0x0a960, 0x0a97c, 2, NULL, NULL },
	{ 0x0a9b3, 0x0a9b3, 0, NULL, NULL },
	{ 0x0aa29, 0x0aa2e, 0, NULL, NULL },
	{ 0x0a9bc, 0x0a9bc, 0, NULL, NULL },
	{ 0x0a9e5, 0x0a9e5, 0, NULL, NULL },
	{ 0x0aa35, 0x0aa36, 0, NULL, NULL },
	{ 0x0aa31, 0x0aa32, 0, NULL, NULL },
	{ 0x0aa43, 0x0aa43, 0, NULL, NULL },
	{ 0x0fb1e, 0x0fb1e, 0, NULL, NULL },
	{ 0x0aaf6, 0x0aaf6, 0, NULL, NULL },
	{ 0x0aab7, 0x0aab8, 0, NULL, NULL },
	{ 0x0aab0, 0x0aab0, 0, NULL, NULL },
	{ 0x0aa7c, 0x0aa7c, 0, NULL, NULL },
	{ 0x0aab2, 0x0aab4, 0, NULL, NULL },
	{ 0x0aac1, 0x0aac1, 0, NULL, NULL },
	{ 0x0aabe, 0x0aabf, 0, NULL, NULL },
	{ 0x0aaec, 0x0aaed, 0, NULL, NULL },
	{ 0x0ac00, 0x0d7a3, 2, NULL, NULL },
	{ 0x0abe8, 0x0abe8, 0, NULL, NULL },
	{ 0x0abe5, 0x0abe5, 0, NULL, NULL },
	{ 0x0abed, 0x0abed, 0, NULL, NULL },
	{ 0x0f900, 0x0fa6d, 2, NULL, NULL },
	{ 0x0d800, 0x0f8ff, 0, NULL, NULL },
	{ 0x0fa70, 0x0fad9, 2, NULL, NULL },
	{ 0x0fff9, 0x0fffb, 0, NULL, NULL },
	{ 0x0fe30, 0x0fe52, 2, NULL, NULL },
	{ 0x0fe10, 0x0fe19, 2, NULL, NULL },
	{ 0x0fe00, 0x0fe0f, 0, NULL, NULL },
	{ 0x0fe20, 0x0fe2d, 0, NULL, NULL },
	{ 0x0fe68, 0x0fe6b, 2, NULL, NULL },
	{ 0x0fe54, 0x0fe66, 2, NULL, NULL },
	{ 0x0feff, 0x0feff, 0, NULL, NULL },
	{ 0x10a01, 0x10a03, 0, NULL, NULL },
	{ 0x102e0, 0x102e0, 0, NULL, NULL },
	{ 0x101fd, 0x101fd, 0, NULL, NULL },
	{ 0x10376, 0x1037a, 0, NULL, NULL },
	{ 0x10a0c, 0x10a0f, 0, NULL, NULL },
	{ 0x10a05, 0x10a06, 0, NULL, NULL },
	{ 0x10a38, 0x10a3a, 0, NULL, NULL },
	{ 0x11633, 0x1163a, 0, NULL, NULL },
	{ 0x11236, 0x11237, 0, NULL, NULL },
	{ 0x11100, 0x11102, 0, NULL, NULL },
	{ 0x1107f, 0x11081, 0, NULL, NULL },
	{ 0x11001, 0x11001, 0, NULL, NULL },
	{ 0x10ae5, 0x10ae6, 0, NULL, NULL },
	{ 0x11038, 0x11046, 0, NULL, NULL },
	{ 0x110b9, 0x110ba, 0, NULL, NULL },
	{ 0x110b3, 0x110b6, 0, NULL, NULL },
	{ 0x110bd, 0x110bd, 0, NULL, NULL },
	{ 0x11180, 0x11181, 0, NULL, NULL },
	{ 0x1112d, 0x11134, 0, NULL, NULL },
	{ 0x11127, 0x1112b, 0, NULL, NULL },
	{ 0x11173, 0x11173, 0, NULL, NULL },
	{ 0x1122f, 0x11231, 0, NULL, NULL },
	{ 0x111b6, 0x111be, 0, NULL, NULL },
	{ 0x11234, 0x11234, 0, NULL, NULL },
	{ 0x11370, 0x11374, 0, NULL, NULL },
	{ 0x11301, 0x11301, 0, NULL, NULL },
	{ 0x112df, 0x112df, 0, NULL, NULL },
	{ 0x112e3, 0x112ea, 0, NULL, NULL },
	{ 0x11340, 0x11340, 0, NULL, NULL },
	{ 0x1133c, 0x1133c, 0, NULL, NULL },
	{ 0x11366, 0x1136c, 0, NULL, NULL },
	{ 0x114c2, 0x114c3, 0, NULL, NULL },
	{ 0x114ba, 0x114ba, 0, NULL, NULL },
	{ 0x114b3, 0x114b8, 0, NULL, NULL },
	{ 0x114bf, 0x114c0, 0, NULL, NULL },
	{ 0x115bc, 0x115bd, 0, NULL, NULL },
	{ 0x115b2, 0x115b5, 0, NULL, NULL },
	{ 0x115bf, 0x115c0, 0, NULL, NULL },
	{ 0x1d1aa, 0x1d1ad, 0, NULL, NULL },
	{ 0x16b30, 0x16b36, 0, NULL, NULL },
	{ 0x116ad, 0x116ad, 0, NULL, NULL },
	{ 0x1163f, 0x11640, 0, NULL, NULL },
	{ 0x1163d, 0x1163d, 0, NULL, NULL },
	{ 0x116ab, 0x116ab, 0, NULL, NULL },
	{ 0x116b7, 0x116b7, 0, NULL, NULL },
	{ 0x116b0, 0x116b5, 0, NULL, NULL },
	{ 0x16af0, 0x16af4, 0, NULL, NULL },
	{ 0x1bca0, 0x1bca3, 0, NULL, NULL },
	{ 0x1b000, 0x1b001, 2, NULL, NULL },
	{ 0x16f8f, 0x16f92, 0, NULL, NULL },
	{ 0x1bc9d, 0x1bc9e, 0, NULL, NULL },
	{ 0x1d173, 0x1d182, 0, NULL, NULL },
	{ 0x1d167, 0x1d169, 0, NULL, NULL },
	{ 0x1d185, 0x1d18b, 0, NULL, NULL },
	{ 0x2a700, 0x2b734, 2, NULL, NULL },
	{ 0x1f210, 0x1f23a, 2, NULL, NULL },
	{ 0x1e8d0, 0x1e8d6, 0, NULL, NULL },
	{ 0x1d242, 0x1d244, 0, NULL, NULL },
	{ 0x1f200, 0x1f202, 2, NULL, NULL },
	{ 0x1f250, 0x1f251, 2, NULL, NULL },
	{ 0x1f240, 0x1f248, 2, NULL, NULL },
	{ 0x20000, 0x2a6d6, 2, NULL, NULL },
	{ 0xe0020, 0xe007f, 0, NULL, NULL },
	{ 0x2f800, 0x2fa1d, 2, NULL, NULL },
	{ 0x2b740, 0x2b81d, 2, NULL, NULL },
	{ 0xe0001, 0xe0001, 0, NULL, NULL },
	{ 0xf0000, 0xffffd, 0, NULL, NULL },
	{ 0xe0100, 0xe01ef, 0, NULL, NULL },
	{ 0x100000, 0x10fffd, 0, NULL, NULL },
	};

	struct utf8_width_entry *utf8_width_root = NULL;

	int utf8_overlap(struct utf8_width_entry , struct utf8_width_entry );
	u_int utf8_combine(const struct utf8_data *);
	u_int utf8_width(const struct utf8_data *);

	/* Set a single character. */
	void
	utf8_set(struct utf8_data *utf8data, u_char ch)
	{
	*utf8data->data = ch;
	utf8data->size = 1;

	utf8data->width = 1;
	}

	/*
	* Open UTF-8 sequence.
	*
	* 11000010-11011111 C2-DF start of 2-byte sequence
	* 11100000-11101111 E0-EF start of 3-byte sequence
	* 11110000-11110100 F0-F4 start of 4-byte sequence
	*
	* Returns 1 if more UTF-8 to come, 0 if not UTF-8.
	*/
	int
	utf8_open(struct utf8_data *utf8data, u_char ch)
	{
	memset(utf8data, 0, sizeof *utf8data);
	if (ch >= 0xc2 && ch <= 0xdf)
	utf8data->size = 2;
	else if (ch >= 0xe0 && ch <= 0xef)
	utf8data->size = 3;
	else if (ch >= 0xf0 && ch <= 0xf4)
	utf8data->size = 4;
	else
	return (0);
	utf8_append(utf8data, ch);
	return (1);
	}

	/*
	* Append character to UTF-8, closing if finished.
	*
	* Returns 1 if more UTF-8 data to come, 0 if finished.
	*/
	int
	utf8_append(struct utf8_data *utf8data, u_char ch)
	{
	if (utf8data->have >= utf8data->size)
	fatalx("UTF-8 character overflow");
	if (utf8data->size > sizeof utf8data->data)
	fatalx("UTF-8 character size too large");

	utf8data->data[utf8data->have++] = ch;
	if (utf8data->have != utf8data->size)
	return (1);

	utf8data->width = utf8_width(utf8data);
	return (0);
	}

	/* Check if two width tree entries overlap. */
	int
	utf8_overlap(struct utf8_width_entry item1, struct utf8_width_entry item2)
	{
	if (item1->first >= item2->first && item1->first <= item2->last)
	return (1);
	if (item1->last >= item2->first && item1->last <= item2->last)
	return (1);
	if (item2->first >= item1->first && item2->first <= item1->last)
	return (1);
	if (item2->last >= item1->first && item2->last <= item1->last)
	return (1);
	return (0);
	}

	/* Build UTF-8 width tree. */
	void
	utf8_build(void)
	{
	struct utf8_width_entry *ptr, item, *node;
	u_int i, j;

	for (i = 0; i < nitems(utf8_width_table); i++) {
	item = &utf8_width_table[i];

	for (j = 0; j < nitems(utf8_width_table); j++) {
	if (i != j && utf8_overlap(item, &utf8_width_table[j]))
	log_fatalx("utf8 overlap: %u %u", i, j);
	}

	ptr = &utf8_width_root;
	while (*ptr != NULL) {
	node = *ptr;
	if (item->last < node->first)
	ptr = &node->left;
	else if (item->first > node->last)
	ptr = &node->right;
	}
	*ptr = item;
	}
	}

	/* Combine UTF-8 into 32-bit Unicode. */
	u_int
	utf8_combine(const struct utf8_data *utf8data)
	{
	u_int value;

	value = 0xff;
	switch (utf8data->size) {
	case 1:
	value = utf8data->data[0];
	break;
	case 2:
	value = utf8data->data[1] & 0x3f;
	value \|= (utf8data->data[0] & 0x1f) << 6;
	break;
	case 3:
	value = utf8data->data[2] & 0x3f;
	value \|= (utf8data->data[1] & 0x3f) << 6;
	value \|= (utf8data->data[0] & 0x0f) << 12;
	break;
	case 4:
	value = utf8data->data[3] & 0x3f;
	value \|= (utf8data->data[2] & 0x3f) << 6;
	value \|= (utf8data->data[1] & 0x3f) << 12;
	value \|= (utf8data->data[0] & 0x07) << 18;
	break;
	}
	return (value);
	}

	/* Split a two-byte UTF-8 character. */
	u_int
	utf8_split2(u_int uc, u_char *ptr)
	{
	if (uc > 0x7f) {
	ptr[0] = (uc >> 6) \| 0xc0;
	ptr[1] = (uc & 0x3f) \| 0x80;
	return (2);
	}
	ptr[0] = uc;
	return (1);
	}

	/* Lookup width of UTF-8 data in tree. */
	u_int
	utf8_width(const struct utf8_data *utf8data)
	{
	struct utf8_width_entry *item;
	u_int value;

	value = utf8_combine(utf8data);

	item = utf8_width_root;
	while (item != NULL) {
	if (value < item->first)
	item = item->left;
	else if (value > item->last)
	item = item->right;
	else
	return (item->width);
	}
	return (1);
	}

	/*
	* Encode len characters from src into dst, which is guaranteed to have four
	* bytes available for each character from src (for \abc or UTF-8) plus space
	* for \0.
	*/
	int
	utf8_strvis(char dst, const char src, size_t len, int flag)
	{
	struct utf8_data utf8data;
	const char start, end;
	int more;
	size_t i;

	start = dst;
	end = src + len;

	while (src < end) {
	if (utf8_open(&utf8data, *src)) {
	more = 1;
	while (++src < end && more)
	more = utf8_append(&utf8data, *src);
	if (!more) {
	/* UTF-8 character finished. */
	for (i = 0; i < utf8data.size; i++)
	*dst++ = utf8data.data[i];
	continue;
	} else if (utf8data.have > 0) {
	/* Not a complete UTF-8 character. */
	src -= utf8data.have;
	}
	}
	if (src < end - 1)
	dst = vis(dst, src[0], flag, src[1]);
	else if (src < end)
	dst = vis(dst, src[0], flag, '\0');
	src++;
	}

	*dst = '\0';
	return (dst - start);
	}

	/*
	* Convert a string into a buffer of UTF-8 characters. Terminated by size == 0.
	* Caller frees.
	*/
	struct utf8_data *
	utf8_fromcstr(const char *src)
	{
	struct utf8_data *dst;
	size_t n;
	int more;

	dst = NULL;

	n = 0;
	while (*src != '\0') {
	dst = xreallocarray(dst, n + 1, sizeof *dst);
	if (utf8_open(&dst[n], *src)) {
	more = 1;
	while (*++src != '\0' && more)
	more = utf8_append(&dst[n], *src);
	if (!more) {
	n++;
	continue;
	}
	src -= dst[n].have;
	}
	utf8_set(&dst[n], *src);
	src++;

	n++;
	}

	dst = xreallocarray(dst, n + 1, sizeof *dst);
	dst[n].size = 0;
	return (dst);
	}

	/* Convert from a buffer of UTF-8 characters into a string. Caller frees. */
	char *
	utf8_tocstr(struct utf8_data *src)
	{
	char *dst;
	size_t n;

	dst = NULL;

	n = 0;
	for(; src->size != 0; src++) {
	dst = xreallocarray(dst, n + src->size, 1);
	memcpy(dst + n, src->data, src->size);
	n += src->size;
	}

	dst = xreallocarray(dst, n + 1, 1);
	dst[n] = '\0';
	return (dst);
	}

	/* Get width of UTF-8 string. */
	u_int
	utf8_cstrwidth(const char *s)
	{
	struct utf8_data tmp;
	u_int width;
	int more;

	width = 0;
	while (*s != '\0') {
	if (utf8_open(&tmp, *s)) {
	more = 1;
	while (*++s != '\0' && more)
	more = utf8_append(&tmp, *s);
	if (!more) {
	width += tmp.width;
	continue;
	}
	s -= tmp.have;
	}
	width++;
	s++;
	}
	return (width);
	}

	/* Trim UTF-8 string to width. Caller frees. */
	char *
	utf8_trimcstr(const char *s, u_int width)
	{
	struct utf8_data tmp, next;
	char *out;
	u_int at;

	tmp = utf8_fromcstr(s);

	at = 0;
	for (next = tmp; next->size != 0; next++) {
	if (at + next->width > width) {
	next->size = 0;
	break;
	}
	at += next->width;
	}

	out = utf8_tocstr(tmp);
	free(tmp);
	return (out);
	}