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227 lines
8.1 KiB
C
227 lines
8.1 KiB
C
/**
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* UTF-8 utility functions
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*
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* (c) 2010-2016 Steve Bennett <steveb@workware.net.au>
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*
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* See LICENCE for licence details.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "utf8.h"
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#ifdef USE_UTF8
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int utf8_fromunicode(char *p, unsigned uc)
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{
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if (uc <= 0x7f) {
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*p = uc;
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return 1;
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}
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else if (uc <= 0x7ff) {
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*p++ = 0xc0 | ((uc & 0x7c0) >> 6);
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*p = 0x80 | (uc & 0x3f);
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return 2;
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}
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else if (uc <= 0xffff) {
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*p++ = 0xe0 | ((uc & 0xf000) >> 12);
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*p++ = 0x80 | ((uc & 0xfc0) >> 6);
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*p = 0x80 | (uc & 0x3f);
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return 3;
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}
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/* Note: We silently truncate to 21 bits here: 0x1fffff */
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else {
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*p++ = 0xf0 | ((uc & 0x1c0000) >> 18);
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*p++ = 0x80 | ((uc & 0x3f000) >> 12);
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*p++ = 0x80 | ((uc & 0xfc0) >> 6);
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*p = 0x80 | (uc & 0x3f);
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return 4;
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}
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}
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int utf8_charlen(int c)
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{
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if ((c & 0x80) == 0) {
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return 1;
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}
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if ((c & 0xe0) == 0xc0) {
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return 2;
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}
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if ((c & 0xf0) == 0xe0) {
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return 3;
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}
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if ((c & 0xf8) == 0xf0) {
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return 4;
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}
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/* Invalid sequence */
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return -1;
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}
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int utf8_strlen(const char *str, int bytelen)
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{
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int charlen = 0;
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if (bytelen < 0) {
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bytelen = strlen(str);
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}
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while (bytelen) {
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int c;
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int l = utf8_tounicode(str, &c);
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charlen++;
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str += l;
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bytelen -= l;
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}
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return charlen;
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}
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int utf8_strwidth(const char *str, int charlen)
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{
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int width = 0;
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while (charlen) {
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int c;
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int l = utf8_tounicode(str, &c);
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width += utf8_width(c);
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str += l;
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charlen--;
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}
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return width;
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}
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int utf8_index(const char *str, int index)
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{
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const char *s = str;
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while (index--) {
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int c;
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s += utf8_tounicode(s, &c);
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}
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return s - str;
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}
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int utf8_tounicode(const char *str, int *uc)
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{
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unsigned const char *s = (unsigned const char *)str;
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if (s[0] < 0xc0) {
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*uc = s[0];
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return 1;
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}
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if (s[0] < 0xe0) {
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if ((s[1] & 0xc0) == 0x80) {
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*uc = ((s[0] & ~0xc0) << 6) | (s[1] & ~0x80);
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return 2;
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}
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}
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else if (s[0] < 0xf0) {
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if (((str[1] & 0xc0) == 0x80) && ((str[2] & 0xc0) == 0x80)) {
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*uc = ((s[0] & ~0xe0) << 12) | ((s[1] & ~0x80) << 6) | (s[2] & ~0x80);
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return 3;
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}
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}
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else if (s[0] < 0xf8) {
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if (((str[1] & 0xc0) == 0x80) && ((str[2] & 0xc0) == 0x80) && ((str[3] & 0xc0) == 0x80)) {
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*uc = ((s[0] & ~0xf0) << 18) | ((s[1] & ~0x80) << 12) | ((s[2] & ~0x80) << 6) | (s[3] & ~0x80);
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return 4;
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}
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}
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/* Invalid sequence, so just return the byte */
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*uc = *s;
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return 1;
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}
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struct utf8range {
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int lower; /* lower inclusive */
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int upper; /* upper exclusive */
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};
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/* From http://unicode.org/Public/UNIDATA/UnicodeData.txt */
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static const struct utf8range unicode_range_combining[] = {
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{ 0x0300, 0x0370 }, { 0x0483, 0x048a }, { 0x0591, 0x05be }, { 0x05bf, 0x05c0 },
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{ 0x05c1, 0x05c3 }, { 0x05c4, 0x05c6 }, { 0x05c7, 0x05d0 }, { 0x0610, 0x061b },
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{ 0x064b, 0x0660 }, { 0x0670, 0x0671 }, { 0x06d6, 0x06dd }, { 0x06de, 0x06e5 },
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{ 0x06e7, 0x06e9 }, { 0x06ea, 0x06ee }, { 0x0711, 0x0712 }, { 0x0730, 0x074d },
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{ 0x07a6, 0x07b1 }, { 0x07eb, 0x07f4 }, { 0x0816, 0x081a }, { 0x081b, 0x0824 },
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{ 0x0825, 0x0828 }, { 0x0829, 0x0830 }, { 0x0900, 0x0904 }, { 0x093c, 0x093d },
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{ 0x093e, 0x0950 }, { 0x0951, 0x0958 }, { 0x0962, 0x0964 }, { 0x0981, 0x0985 },
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{ 0x09bc, 0x09bd }, { 0x09be, 0x09ce }, { 0x09d7, 0x09dc }, { 0x09e2, 0x09e6 },
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{ 0x0a01, 0x0a05 }, { 0x0a3c, 0x0a59 }, { 0x0a70, 0x0a72 }, { 0x0a75, 0x0a85 },
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{ 0x0abc, 0x0abd }, { 0x0abe, 0x0ad0 }, { 0x0ae2, 0x0ae6 }, { 0x0b01, 0x0b05 },
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{ 0x0b3c, 0x0b3d }, { 0x0b3e, 0x0b5c }, { 0x0b62, 0x0b66 }, { 0x0b82, 0x0b83 },
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{ 0x0bbe, 0x0bd0 }, { 0x0bd7, 0x0be6 }, { 0x0c01, 0x0c05 }, { 0x0c3e, 0x0c58 },
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{ 0x0c62, 0x0c66 }, { 0x0c82, 0x0c85 }, { 0x0cbc, 0x0cbd }, { 0x0cbe, 0x0cde },
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{ 0x0ce2, 0x0ce6 }, { 0x0d02, 0x0d05 }, { 0x0d3e, 0x0d60 }, { 0x0d62, 0x0d66 },
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{ 0x0d82, 0x0d85 }, { 0x0dca, 0x0df4 }, { 0x0e31, 0x0e32 }, { 0x0e34, 0x0e3f },
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{ 0x0e47, 0x0e4f }, { 0x0eb1, 0x0eb2 }, { 0x0eb4, 0x0ebd }, { 0x0ec8, 0x0ed0 },
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{ 0x0f18, 0x0f1a }, { 0x0f35, 0x0f36 }, { 0x0f37, 0x0f38 }, { 0x0f39, 0x0f3a },
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{ 0x0f3e, 0x0f40 }, { 0x0f71, 0x0f85 }, { 0x0f86, 0x0f88 }, { 0x0f90, 0x0fbe },
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{ 0x0fc6, 0x0fc7 }, { 0x102b, 0x103f }, { 0x1056, 0x105a }, { 0x105e, 0x1061 },
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{ 0x1062, 0x1065 }, { 0x1067, 0x106e }, { 0x1071, 0x1075 }, { 0x1082, 0x108e },
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{ 0x108f, 0x1090 }, { 0x109a, 0x109e }, { 0x135f, 0x1360 }, { 0x1712, 0x1720 },
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{ 0x1732, 0x1735 }, { 0x1752, 0x1760 }, { 0x1772, 0x1780 }, { 0x17b6, 0x17d4 },
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{ 0x17dd, 0x17e0 }, { 0x180b, 0x180e }, { 0x18a9, 0x18aa }, { 0x1920, 0x1940 },
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{ 0x19b0, 0x19c1 }, { 0x19c8, 0x19d0 }, { 0x1a17, 0x1a1e }, { 0x1a55, 0x1a80 },
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{ 0x1b00, 0x1b05 }, { 0x1b34, 0x1b45 }, { 0x1b6b, 0x1b74 }, { 0x1b80, 0x1b83 },
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{ 0x1ba1, 0x1bae }, { 0x1c24, 0x1c3b }, { 0x1cd0, 0x1cd3 }, { 0x1cd4, 0x1ce9 },
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{ 0x1ced, 0x1cee }, { 0x1cf2, 0x1d00 }, { 0x1dc0, 0x1e00 }, { 0x20d0, 0x2100 },
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{ 0x2cef, 0x2cf9 }, { 0x2de0, 0x2e00 }, { 0x302a, 0x3030 }, { 0x3099, 0x309b },
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{ 0xa66f, 0xa673 }, { 0xa67c, 0xa67e }, { 0xa6f0, 0xa6f2 }, { 0xa802, 0xa803 },
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{ 0xa806, 0xa807 }, { 0xa80b, 0xa80c }, { 0xa823, 0xa828 }, { 0xa880, 0xa882 },
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{ 0xa8b4, 0xa8ce }, { 0xa8e0, 0xa8f2 }, { 0xa926, 0xa92e }, { 0xa947, 0xa95f },
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{ 0xa980, 0xa984 }, { 0xa9b3, 0xa9c1 }, { 0xaa29, 0xaa40 }, { 0xaa43, 0xaa44 },
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{ 0xaa4c, 0xaa50 }, { 0xaa7b, 0xaa80 }, { 0xaab0, 0xaab1 }, { 0xaab2, 0xaab5 },
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{ 0xaab7, 0xaab9 }, { 0xaabe, 0xaac0 }, { 0xaac1, 0xaac2 }, { 0xabe3, 0xabeb },
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{ 0xabec, 0xabf0 }, { 0xfb1e, 0xfb1f }, { 0xfe00, 0xfe10 }, { 0xfe20, 0xfe30 },
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};
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static const struct utf8range unicode_range_wide[] = {
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{ 0x1100, 0x115f }, { 0x2329, 0x232a }, { 0x2e80, 0x2e99 }, { 0x2e9b, 0x2ef3 },
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{ 0x2f00, 0x2fd5 }, { 0x2ff0, 0x2ffb }, { 0x3000, 0x303e }, { 0x3041, 0x3096 },
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{ 0x3099, 0x30ff }, { 0x3105, 0x312d }, { 0x3131, 0x318e }, { 0x3190, 0x31ba },
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{ 0x31c0, 0x31e3 }, { 0x31f0, 0x321e }, { 0x3220, 0x3247 }, { 0x3250, 0x4dbf },
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{ 0x4e00, 0xa48c }, { 0xa490, 0xa4c6 }, { 0xa960, 0xa97c }, { 0xac00, 0xd7a3 },
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{ 0xf900, 0xfaff }, { 0xfe10, 0xfe19 }, { 0xfe30, 0xfe52 }, { 0xfe54, 0xfe66 },
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{ 0xfe68, 0xfe6b }, { 0xff01, 0xffe6 }, { 0x1b000, 0x1b001 }, { 0x1f200, 0x1f202 },
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{ 0x1f210, 0x1f23a }, { 0x1f240, 0x1f248 }, { 0x1f250, 0x1f251 }, { 0x20000, 0x3fffd },
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};
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#define ARRAYSIZE(A) sizeof(A) / sizeof(*(A))
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static int cmp_range(const void *key, const void *cm)
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{
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const struct utf8range *range = (const struct utf8range *)cm;
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int ch = *(int *)key;
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if (ch < range->lower) {
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return -1;
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}
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if (ch >= range->upper) {
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return 1;
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}
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return 0;
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}
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static int utf8_in_range(const struct utf8range *range, int num, int ch)
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{
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const struct utf8range *r =
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bsearch(&ch, range, num, sizeof(*range), cmp_range);
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if (r) {
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return 1;
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}
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return 0;
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}
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int utf8_width(int ch)
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{
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/* short circuit for common case */
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if (isascii(ch)) {
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return 1;
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}
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if (utf8_in_range(unicode_range_combining, ARRAYSIZE(unicode_range_combining), ch)) {
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return 0;
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}
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if (utf8_in_range(unicode_range_wide, ARRAYSIZE(unicode_range_wide), ch)) {
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return 2;
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}
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return 1;
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}
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#endif
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