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tmux/utf8.c
nicm c5689a5a40 Long overdue change to the way we store cells in the grid: now, instead 
of storing a full grid_cell with UTF-8 data and everything, store a new
type grid_cell_entry. This can either be the cell itself (for ASCII
cells), or an offset into an extended array (per line) for UTF-8
data.

This avoid a large (8 byte) overhead on non-UTF-8 cells (by far the
majority for most users) without the complexity of the shadow array we
had before. Grid memory without any UTF-8 is about half.

The disadvantage that cells can no longer be modified in place and need
to be copied out of the grid and back but it turned out to be lot less
complicated than I expected.
2015-11-13 08:09:28 +00:00

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/* $OpenBSD$ */
/*
* 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 <vis.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. */
static 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 },
};
static struct utf8_width_entry *utf8_width_root = NULL;
static void utf8_build(void);
/* Set a single character. */
void
utf8_set(struct utf8_data *ud, u_char ch)
{
u_int i;
*ud->data = ch;
ud->size = 1;
ud->width = 1;
for (i = ud->size; i < sizeof ud->data; i++)
ud->data[i] = '\0';
}
/* Copy UTF-8 character. */
void
utf8_copy(struct utf8_data *to, const struct utf8_data *from)
{
u_int i;
memcpy(to, from, sizeof *to);
for (i = to->size; i < sizeof to->data; i++)
to->data[i] = '\0';
}
/*
* 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 *ud, u_char ch)
{
memset(ud, 0, sizeof *ud);
if (ch >= 0xc2 && ch <= 0xdf)
ud->size = 2;
else if (ch >= 0xe0 && ch <= 0xef)
ud->size = 3;
else if (ch >= 0xf0 && ch <= 0xf4)
ud->size = 4;
else
return (0);
utf8_append(ud, 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 *ud, u_char ch)
{
/* XXX this should do validity checks too! */
if (ud->have >= ud->size)
fatalx("UTF-8 character overflow");
if (ud->size > sizeof ud->data)
fatalx("UTF-8 character size too large");
ud->data[ud->have++] = ch;
if (ud->have != ud->size)
return (1);
ud->width = utf8_width(utf8_combine(ud));
return (0);
}
/* Build UTF-8 width tree. */
static void
utf8_build(void)
{
struct utf8_width_entry **ptr, *item, *node;
u_int i;
for (i = 0; i < nitems(utf8_width_table); i++) {
item = &utf8_width_table[i];
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;
}
}
/* Lookup width of UTF-8 data in tree. */
u_int
utf8_width(u_int uc)
{
struct utf8_width_entry *item;
if (utf8_width_root == NULL)
utf8_build();
item = utf8_width_root;
while (item != NULL) {
if (uc < item->first)
item = item->left;
else if (uc > item->last)
item = item->right;
else
return (item->width);
}
return (1);
}
/* Combine UTF-8 into 32-bit Unicode. */
u_int
utf8_combine(const struct utf8_data *ud)
{
u_int value;
value = 0xff;
switch (ud->size) {
case 1:
value = ud->data[0];
break;
case 2:
value = ud->data[1] & 0x3f;
value |= (ud->data[0] & 0x1f) << 6;
break;
case 3:
value = ud->data[2] & 0x3f;
value |= (ud->data[1] & 0x3f) << 6;
value |= (ud->data[0] & 0xf) << 12;
break;
case 4:
value = ud->data[3] & 0x3f;
value |= (ud->data[2] & 0x3f) << 6;
value |= (ud->data[1] & 0x3f) << 12;
value |= (ud->data[0] & 0x7) << 18;
break;
}
return (value);
}
/* Split 32-bit Unicode into UTF-8. */
int
utf8_split(u_int uc, struct utf8_data *ud)
{
if (uc < 0x7f) {
ud->size = 1;
ud->data[0] = uc;
} else if (uc < 0x7ff) {
ud->size = 2;
ud->data[0] = 0xc0 | ((uc >> 6) & 0x1f);
ud->data[1] = 0x80 | (uc & 0x3f);
} else if (uc < 0xffff) {
ud->size = 3;
ud->data[0] = 0xe0 | ((uc >> 12) & 0xf);
ud->data[1] = 0x80 | ((uc >> 6) & 0x3f);
ud->data[2] = 0x80 | (uc & 0x3f);
} else if (uc < 0x1fffff) {
ud->size = 4;
ud->data[0] = 0xf0 | ((uc >> 18) & 0x7);
ud->data[1] = 0x80 | ((uc >> 12) & 0x3f);
ud->data[2] = 0x80 | ((uc >> 6) & 0x3f);
ud->data[3] = 0x80 | (uc & 0x3f);
} else
return (-1);
ud->width = utf8_width(uc);
return (0);
}
/* 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);
}
/*
* 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 ud;
const char *start, *end;
int more;
size_t i;
start = dst;
end = src + len;
while (src < end) {
if (utf8_open(&ud, *src)) {
more = 1;
while (++src < end && more)
more = utf8_append(&ud, *src);
if (!more) {
/* UTF-8 character finished. */
for (i = 0; i < ud.size; i++)
*dst++ = ud.data[i];
continue;
} else if (ud.have > 0) {
/* Not a complete UTF-8 character. */
src -= ud.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);
}
/*
* Sanitize a string, changing any UTF-8 characters to '_'. Caller should free
* the returned string. Anything not valid printable ASCII or UTF-8 is
* stripped.
*/
char *
utf8_sanitize(const char *src)
{
char *dst;
size_t n;
int more;
struct utf8_data ud;
u_int i;
dst = NULL;
n = 0;
while (*src != '\0') {
dst = xreallocarray(dst, n + 1, sizeof *dst);
if (utf8_open(&ud, *src)) {
more = 1;
while (*++src != '\0' && more)
more = utf8_append(&ud, *src);
if (!more) {
dst = xreallocarray(dst, n + ud.width,
sizeof *dst);
for (i = 0; i < ud.width; i++)
dst[n++] = '_';
continue;
}
src -= ud.have;
}
if (*src > 0x1f && *src < 0x7f)
dst[n] = *src;
src++;
n++;
}
dst = xreallocarray(dst, n + 1, sizeof *dst);
dst[n] = '\0';
return (dst);
}
/*
* 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);
}
/* Pad UTF-8 string to width. Caller frees. */
char *
utf8_padcstr(const char *s, u_int width)
{
size_t slen;
char *out;
u_int n, i;
n = utf8_cstrwidth(s);
if (n >= width)
return (xstrdup(s));
slen = strlen(s);
out = xmalloc(slen + 1 + (width - n));
memcpy(out, s, slen);
for (i = n; i < width; i++)
out[slen++] = ' ';
out[slen] = '\0';
return (out);
}
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