tmux/utf8.c

/* $Id: utf8.c,v 1.4 2009-01-26 20:57:45 nicm 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 <string.h>

#include "tmux.h"

struct {
	u_int	first;
	u_int	last;
	int	width;
} utf8_width_table[] = {
	{ 0x00300, 0x0036f, 0 },
	{ 0x00483, 0x00486, 0 },
	{ 0x00488, 0x00489, 0 },
	{ 0x00591, 0x005bd, 0 },
	{ 0x005bf, 0x005bf, 0 },
	{ 0x005c1, 0x005c2, 0 },
	{ 0x005c4, 0x005c5, 0 },
	{ 0x005c7, 0x005c7, 0 },
	{ 0x00600, 0x00603, 0 },
	{ 0x00610, 0x00615, 0 },
	{ 0x0064b, 0x0065e, 0 },
	{ 0x00670, 0x00670, 0 },
	{ 0x006d6, 0x006e4, 0 },
	{ 0x006e7, 0x006e8, 0 },
	{ 0x006ea, 0x006ed, 0 },
	{ 0x0070f, 0x0070f, 0 },
	{ 0x00711, 0x00711, 0 },
	{ 0x00730, 0x0074a, 0 },
	{ 0x007a6, 0x007b0, 0 },
	{ 0x007eb, 0x007f3, 0 },
	{ 0x00901, 0x00902, 0 },
	{ 0x0093c, 0x0093c, 0 },
	{ 0x00941, 0x00948, 0 },
	{ 0x0094d, 0x0094d, 0 },
	{ 0x00951, 0x00954, 0 },
	{ 0x00962, 0x00963, 0 },
	{ 0x00981, 0x00981, 0 },
	{ 0x009bc, 0x009bc, 0 },
	{ 0x009c1, 0x009c4, 0 },
	{ 0x009cd, 0x009cd, 0 },
	{ 0x009e2, 0x009e3, 0 },
	{ 0x00a01, 0x00a02, 0 },
	{ 0x00a3c, 0x00a3c, 0 },
	{ 0x00a41, 0x00a42, 0 },
	{ 0x00a47, 0x00a48, 0 },
	{ 0x00a4b, 0x00a4d, 0 },
	{ 0x00a70, 0x00a71, 0 },
	{ 0x00a81, 0x00a82, 0 },
	{ 0x00abc, 0x00abc, 0 },
	{ 0x00ac1, 0x00ac5, 0 },
	{ 0x00ac7, 0x00ac8, 0 },
	{ 0x00acd, 0x00acd, 0 },
	{ 0x00ae2, 0x00ae3, 0 },
	{ 0x00b01, 0x00b01, 0 },
	{ 0x00b3c, 0x00b3c, 0 },
	{ 0x00b3f, 0x00b3f, 0 },
	{ 0x00b41, 0x00b43, 0 },
	{ 0x00b4d, 0x00b4d, 0 },
	{ 0x00b56, 0x00b56, 0 },
	{ 0x00b82, 0x00b82, 0 },
	{ 0x00bc0, 0x00bc0, 0 },
	{ 0x00bcd, 0x00bcd, 0 },
	{ 0x00c3e, 0x00c40, 0 },
	{ 0x00c46, 0x00c48, 0 },
	{ 0x00c4a, 0x00c4d, 0 },
	{ 0x00c55, 0x00c56, 0 },
	{ 0x00cbc, 0x00cbc, 0 },
	{ 0x00cbf, 0x00cbf, 0 },
	{ 0x00cc6, 0x00cc6, 0 },
	{ 0x00ccc, 0x00ccd, 0 },
	{ 0x00ce2, 0x00ce3, 0 },
	{ 0x00d41, 0x00d43, 0 },
	{ 0x00d4d, 0x00d4d, 0 },
	{ 0x00dca, 0x00dca, 0 },
	{ 0x00dd2, 0x00dd4, 0 },
	{ 0x00dd6, 0x00dd6, 0 },
	{ 0x00e31, 0x00e31, 0 },
	{ 0x00e34, 0x00e3a, 0 },
	{ 0x00e47, 0x00e4e, 0 },
	{ 0x00eb1, 0x00eb1, 0 },
	{ 0x00eb4, 0x00eb9, 0 },
	{ 0x00ebb, 0x00ebc, 0 },
	{ 0x00ec8, 0x00ecd, 0 },
	{ 0x00f18, 0x00f19, 0 },
	{ 0x00f35, 0x00f35, 0 },
	{ 0x00f37, 0x00f37, 0 },
	{ 0x00f39, 0x00f39, 0 },
	{ 0x00f71, 0x00f7e, 0 },
	{ 0x00f80, 0x00f84, 0 },
	{ 0x00f86, 0x00f87, 0 },
	{ 0x00f90, 0x00f97, 0 },
	{ 0x00f99, 0x00fbc, 0 },
	{ 0x00fc6, 0x00fc6, 0 },
	{ 0x0102d, 0x01030, 0 },
	{ 0x01032, 0x01032, 0 },
	{ 0x01036, 0x01037, 0 },
	{ 0x01039, 0x01039, 0 },
	{ 0x01058, 0x01059, 0 },
	{ 0x01100, 0x0115f, 2 },
	{ 0x01160, 0x011ff, 0 },
	{ 0x0135f, 0x0135f, 0 },
	{ 0x01712, 0x01714, 0 },
	{ 0x01732, 0x01734, 0 },
	{ 0x01752, 0x01753, 0 },
	{ 0x01772, 0x01773, 0 },
	{ 0x017b4, 0x017b5, 0 },
	{ 0x017b7, 0x017bd, 0 },
	{ 0x017c6, 0x017c6, 0 },
	{ 0x017c9, 0x017d3, 0 },
	{ 0x017dd, 0x017dd, 0 },
	{ 0x0180b, 0x0180d, 0 },
	{ 0x018a9, 0x018a9, 0 },
	{ 0x01920, 0x01922, 0 },
	{ 0x01927, 0x01928, 0 },
	{ 0x01932, 0x01932, 0 },
	{ 0x01939, 0x0193b, 0 },
	{ 0x01a17, 0x01a18, 0 },
	{ 0x01b00, 0x01b03, 0 },
	{ 0x01b34, 0x01b34, 0 },
	{ 0x01b36, 0x01b3a, 0 },
	{ 0x01b3c, 0x01b3c, 0 },
	{ 0x01b42, 0x01b42, 0 },
	{ 0x01b6b, 0x01b73, 0 },
	{ 0x01dc0, 0x01dca, 0 },
	{ 0x01dfe, 0x01dff, 0 },
	{ 0x0200b, 0x0200f, 0 },
	{ 0x0202a, 0x0202e, 0 },
	{ 0x02060, 0x02063, 0 },
	{ 0x0206a, 0x0206f, 0 },
	{ 0x020d0, 0x020ef, 0 },
	{ 0x02329, 0x02329, 2 },
	{ 0x0232a, 0x0232a, 2 },
	{ 0x02e80, 0x03029, 2 },
	{ 0x0302a, 0x0302f, 0 },	
	{ 0x03030, 0x0303e, 2 },
	{ 0x03040, 0x0a4cf, 2 },
	{ 0x03099, 0x0309a, 0 },
	{ 0x0a806, 0x0a806, 0 },
	{ 0x0a80b, 0x0a80b, 0 },
	{ 0x0a825, 0x0a826, 0 },
	{ 0x0ac00, 0x0d7a3, 2 },
	{ 0x0f900, 0x0faff, 2 },
	{ 0x0fb1e, 0x0fb1e, 0 },
	{ 0x0fe00, 0x0fe0f, 0 },
	{ 0x0fe10, 0x0fe19, 2 },
	{ 0x0fe20, 0x0fe23, 0 },
	{ 0x0fe30, 0x0fe6f, 2 },
	{ 0x0feff, 0x0feff, 0 },
	{ 0x0ff00, 0x0ff60, 2 },
	{ 0x0ffe0, 0x0ffe6, 2 },
	{ 0x0fff9, 0x0fffb, 0 },
	{ 0x10a01, 0x10a03, 0 },
	{ 0x10a05, 0x10a06, 0 },
	{ 0x10a0c, 0x10a0f, 0 },
	{ 0x10a38, 0x10a3a, 0 },
	{ 0x10a3f, 0x10a3f, 0 },
	{ 0x1d167, 0x1d169, 0 },
	{ 0x1d173, 0x1d182, 0 },
	{ 0x1d185, 0x1d18b, 0 },
	{ 0x1d1aa, 0x1d1ad, 0 },
	{ 0x1d242, 0x1d244, 0 },
	{ 0x20000, 0x2fffd, 2 },
	{ 0x30000, 0x3fffd, 2 },
	{ 0xe0001, 0xe0001, 0 },
	{ 0xe0020, 0xe007f, 0 },
	{ 0xe0100, 0xe01ef, 0 }
};

u_int
utf8_combine(const u_char *data)
{
	u_int	uv;

	if (data[1] == 0xff)
		uv = data[0];
	else if (data[2] == 0xff) {
		uv = data[1] & 0x3f;
		uv |= (data[0] & 0x1f) << 6;
	} else if (data[3] == 0xff) {
		uv = data[2] & 0x3f;
		uv |= (data[1] & 0x3f) << 6;
		uv |= (data[0] & 0x0f) << 12;
	} else {
		uv = data[3] & 0x3f;
		uv |= (data[2] & 0x3f) << 6;
		uv |= (data[1] & 0x3f) << 12;
		uv |= (data[0] & 0x3f) << 18;
	}
	return (uv);
}

void
utf8_split(u_int uv, u_char *data)
{
	memset(data, 0xff, 4);

	if (uv <= 0x7f)
		data[0] = uv;
	else if (uv > 0x7f && uv <= 0x7ff) {
		data[0] = (uv >> 6) | 0xc0;
		data[1] = (uv & 0x3f) | 0x80;
	} else if (uv > 0x7ff && uv <= 0xffff) {
		data[0] = (uv >> 12) | 0xe0;
		data[1] = ((uv >> 6) & 0x3f) | 0x80;
		data[2] = (uv & 0x3f) | 0x80;
	} else if (uv > 0xffff && uv <= 0x10ffff) {
		data[0] = (uv >> 18) | 0xf0;
		data[1] = ((uv >> 12) & 0x3f) | 0x80;
		data[2] = ((uv >> 6) & 0x3f) | 0x80;
		data[3] = (uv & 0x3f) | 0x80;
	}
}

int
utf8_width(u_int uv)
{
	u_int	i;

	for (i = 0; i < nitems(utf8_width_table); i++) {
		/* XXX bsearch */
		if (uv < utf8_width_table[i].first)
			continue;
		if (uv > utf8_width_table[i].last)
		        continue;
		return (utf8_width_table[i].width);
	}
	return (1);
}