Annotation of src/usr.bin/tmux/utf8.c, Revision 1.10
1.10 ! nicm 1: /* $OpenBSD: utf8.c,v 1.9 2014/04/02 18:12:18 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
21: #include <string.h>
1.9 nicm 22: #include <vis.h>
1.1 nicm 23:
24: #include "tmux.h"
25:
26: struct utf8_width_entry {
27: u_int first;
28: u_int last;
29:
30: int width;
31:
32: struct utf8_width_entry *left;
33: struct utf8_width_entry *right;
34: };
35:
36: /* Random order. Not optimal but it'll do for now... */
37: struct utf8_width_entry utf8_width_table[] = {
38: { 0x00951, 0x00954, 0, NULL, NULL },
39: { 0x00ccc, 0x00ccd, 0, NULL, NULL },
40: { 0x0fff9, 0x0fffb, 0, NULL, NULL },
41: { 0x20000, 0x2fffd, 2, NULL, NULL },
42: { 0x00ebb, 0x00ebc, 0, NULL, NULL },
43: { 0x01932, 0x01932, 0, NULL, NULL },
44: { 0x0070f, 0x0070f, 0, NULL, NULL },
45: { 0x00a70, 0x00a71, 0, NULL, NULL },
46: { 0x02329, 0x02329, 2, NULL, NULL },
47: { 0x00acd, 0x00acd, 0, NULL, NULL },
48: { 0x00ac7, 0x00ac8, 0, NULL, NULL },
49: { 0x00a3c, 0x00a3c, 0, NULL, NULL },
50: { 0x009cd, 0x009cd, 0, NULL, NULL },
51: { 0x00591, 0x005bd, 0, NULL, NULL },
52: { 0x01058, 0x01059, 0, NULL, NULL },
53: { 0x0ffe0, 0x0ffe6, 2, NULL, NULL },
54: { 0x01100, 0x0115f, 2, NULL, NULL },
55: { 0x0fe20, 0x0fe23, 0, NULL, NULL },
56: { 0x0302a, 0x0302f, 0, NULL, NULL },
57: { 0x01772, 0x01773, 0, NULL, NULL },
58: { 0x005bf, 0x005bf, 0, NULL, NULL },
59: { 0x006ea, 0x006ed, 0, NULL, NULL },
60: { 0x00bc0, 0x00bc0, 0, NULL, NULL },
61: { 0x00962, 0x00963, 0, NULL, NULL },
62: { 0x01732, 0x01734, 0, NULL, NULL },
63: { 0x00d41, 0x00d43, 0, NULL, NULL },
64: { 0x01b42, 0x01b42, 0, NULL, NULL },
65: { 0x00a41, 0x00a42, 0, NULL, NULL },
66: { 0x00eb4, 0x00eb9, 0, NULL, NULL },
67: { 0x00b01, 0x00b01, 0, NULL, NULL },
68: { 0x00e34, 0x00e3a, 0, NULL, NULL },
69: { 0x03040, 0x03098, 2, NULL, NULL },
70: { 0x0093c, 0x0093c, 0, NULL, NULL },
71: { 0x00c4a, 0x00c4d, 0, NULL, NULL },
72: { 0x01032, 0x01032, 0, NULL, NULL },
73: { 0x00f37, 0x00f37, 0, NULL, NULL },
74: { 0x00901, 0x00902, 0, NULL, NULL },
75: { 0x00cbf, 0x00cbf, 0, NULL, NULL },
76: { 0x0a806, 0x0a806, 0, NULL, NULL },
77: { 0x00dd2, 0x00dd4, 0, NULL, NULL },
78: { 0x00f71, 0x00f7e, 0, NULL, NULL },
79: { 0x01752, 0x01753, 0, NULL, NULL },
80: { 0x1d242, 0x1d244, 0, NULL, NULL },
81: { 0x005c1, 0x005c2, 0, NULL, NULL },
82: { 0x0309b, 0x0a4cf, 2, NULL, NULL },
83: { 0xe0100, 0xe01ef, 0, NULL, NULL },
84: { 0x017dd, 0x017dd, 0, NULL, NULL },
85: { 0x00600, 0x00603, 0, NULL, NULL },
86: { 0x009e2, 0x009e3, 0, NULL, NULL },
87: { 0x00cc6, 0x00cc6, 0, NULL, NULL },
88: { 0x0a80b, 0x0a80b, 0, NULL, NULL },
89: { 0x01712, 0x01714, 0, NULL, NULL },
90: { 0x00b3c, 0x00b3c, 0, NULL, NULL },
91: { 0x01b00, 0x01b03, 0, NULL, NULL },
92: { 0x007eb, 0x007f3, 0, NULL, NULL },
93: { 0xe0001, 0xe0001, 0, NULL, NULL },
94: { 0x1d185, 0x1d18b, 0, NULL, NULL },
95: { 0x0feff, 0x0feff, 0, NULL, NULL },
96: { 0x01b36, 0x01b3a, 0, NULL, NULL },
97: { 0x01920, 0x01922, 0, NULL, NULL },
98: { 0x00670, 0x00670, 0, NULL, NULL },
99: { 0x00f90, 0x00f97, 0, NULL, NULL },
100: { 0x01927, 0x01928, 0, NULL, NULL },
101: { 0x0200b, 0x0200f, 0, NULL, NULL },
102: { 0x0ff00, 0x0ff60, 2, NULL, NULL },
103: { 0x0f900, 0x0faff, 2, NULL, NULL },
104: { 0x0fb1e, 0x0fb1e, 0, NULL, NULL },
105: { 0x00cbc, 0x00cbc, 0, NULL, NULL },
106: { 0x00eb1, 0x00eb1, 0, NULL, NULL },
107: { 0x10a38, 0x10a3a, 0, NULL, NULL },
108: { 0x007a6, 0x007b0, 0, NULL, NULL },
109: { 0x00f80, 0x00f84, 0, NULL, NULL },
110: { 0x005c4, 0x005c5, 0, NULL, NULL },
111: { 0x0ac00, 0x0d7a3, 2, NULL, NULL },
112: { 0x017c9, 0x017d3, 0, NULL, NULL },
113: { 0x00d4d, 0x00d4d, 0, NULL, NULL },
114: { 0x1d167, 0x1d169, 0, NULL, NULL },
115: { 0x01036, 0x01037, 0, NULL, NULL },
116: { 0xe0020, 0xe007f, 0, NULL, NULL },
117: { 0x00f35, 0x00f35, 0, NULL, NULL },
118: { 0x017b4, 0x017b5, 0, NULL, NULL },
119: { 0x0206a, 0x0206f, 0, NULL, NULL },
120: { 0x00c46, 0x00c48, 0, NULL, NULL },
121: { 0x01939, 0x0193b, 0, NULL, NULL },
122: { 0x01dc0, 0x01dca, 0, NULL, NULL },
123: { 0x10a0c, 0x10a0f, 0, NULL, NULL },
124: { 0x0102d, 0x01030, 0, NULL, NULL },
125: { 0x017c6, 0x017c6, 0, NULL, NULL },
126: { 0x00ec8, 0x00ecd, 0, NULL, NULL },
127: { 0x00b41, 0x00b43, 0, NULL, NULL },
128: { 0x017b7, 0x017bd, 0, NULL, NULL },
129: { 0x1d173, 0x1d182, 0, NULL, NULL },
130: { 0x00a47, 0x00a48, 0, NULL, NULL },
131: { 0x0232a, 0x0232a, 2, NULL, NULL },
132: { 0x01b3c, 0x01b3c, 0, NULL, NULL },
133: { 0x10a01, 0x10a03, 0, NULL, NULL },
134: { 0x00ae2, 0x00ae3, 0, NULL, NULL },
135: { 0x00483, 0x00486, 0, NULL, NULL },
136: { 0x0135f, 0x0135f, 0, NULL, NULL },
137: { 0x01a17, 0x01a18, 0, NULL, NULL },
138: { 0x006e7, 0x006e8, 0, NULL, NULL },
139: { 0x03099, 0x0309a, 0, NULL, NULL },
140: { 0x00b4d, 0x00b4d, 0, NULL, NULL },
141: { 0x00ce2, 0x00ce3, 0, NULL, NULL },
142: { 0x00bcd, 0x00bcd, 0, NULL, NULL },
143: { 0x00610, 0x00615, 0, NULL, NULL },
144: { 0x00f99, 0x00fbc, 0, NULL, NULL },
145: { 0x009c1, 0x009c4, 0, NULL, NULL },
146: { 0x00730, 0x0074a, 0, NULL, NULL },
147: { 0x00300, 0x0036f, 0, NULL, NULL },
148: { 0x03030, 0x0303e, 2, NULL, NULL },
149: { 0x01b34, 0x01b34, 0, NULL, NULL },
150: { 0x1d1aa, 0x1d1ad, 0, NULL, NULL },
151: { 0x00dca, 0x00dca, 0, NULL, NULL },
152: { 0x006d6, 0x006e4, 0, NULL, NULL },
153: { 0x00f86, 0x00f87, 0, NULL, NULL },
154: { 0x00b3f, 0x00b3f, 0, NULL, NULL },
155: { 0x0fe30, 0x0fe6f, 2, NULL, NULL },
156: { 0x01039, 0x01039, 0, NULL, NULL },
157: { 0x0094d, 0x0094d, 0, NULL, NULL },
158: { 0x00c55, 0x00c56, 0, NULL, NULL },
159: { 0x00488, 0x00489, 0, NULL, NULL },
160: { 0x00e47, 0x00e4e, 0, NULL, NULL },
161: { 0x00a81, 0x00a82, 0, NULL, NULL },
162: { 0x00ac1, 0x00ac5, 0, NULL, NULL },
163: { 0x0202a, 0x0202e, 0, NULL, NULL },
164: { 0x00dd6, 0x00dd6, 0, NULL, NULL },
165: { 0x018a9, 0x018a9, 0, NULL, NULL },
166: { 0x0064b, 0x0065e, 0, NULL, NULL },
167: { 0x00abc, 0x00abc, 0, NULL, NULL },
168: { 0x00b82, 0x00b82, 0, NULL, NULL },
169: { 0x00f39, 0x00f39, 0, NULL, NULL },
170: { 0x020d0, 0x020ef, 0, NULL, NULL },
171: { 0x01dfe, 0x01dff, 0, NULL, NULL },
172: { 0x30000, 0x3fffd, 2, NULL, NULL },
173: { 0x00711, 0x00711, 0, NULL, NULL },
174: { 0x0fe00, 0x0fe0f, 0, NULL, NULL },
175: { 0x0180b, 0x0180d, 0, NULL, NULL },
176: { 0x10a3f, 0x10a3f, 0, NULL, NULL },
177: { 0x00981, 0x00981, 0, NULL, NULL },
178: { 0x0a825, 0x0a826, 0, NULL, NULL },
179: { 0x00941, 0x00948, 0, NULL, NULL },
180: { 0x01b6b, 0x01b73, 0, NULL, NULL },
181: { 0x00e31, 0x00e31, 0, NULL, NULL },
182: { 0x0fe10, 0x0fe19, 2, NULL, NULL },
183: { 0x00a01, 0x00a02, 0, NULL, NULL },
184: { 0x00a4b, 0x00a4d, 0, NULL, NULL },
185: { 0x00f18, 0x00f19, 0, NULL, NULL },
186: { 0x00fc6, 0x00fc6, 0, NULL, NULL },
187: { 0x02e80, 0x03029, 2, NULL, NULL },
188: { 0x00b56, 0x00b56, 0, NULL, NULL },
189: { 0x009bc, 0x009bc, 0, NULL, NULL },
190: { 0x005c7, 0x005c7, 0, NULL, NULL },
191: { 0x02060, 0x02063, 0, NULL, NULL },
192: { 0x00c3e, 0x00c40, 0, NULL, NULL },
193: { 0x10a05, 0x10a06, 0, NULL, NULL },
194: };
195:
196: struct utf8_width_entry *utf8_width_root = NULL;
197:
198: int utf8_overlap(struct utf8_width_entry *, struct utf8_width_entry *);
1.4 nicm 199: u_int utf8_combine(const struct utf8_data *);
200: u_int utf8_width(const struct utf8_data *);
1.1 nicm 201:
1.4 nicm 202: /*
203: * Open UTF-8 sequence.
204: *
205: * 11000010-11011111 C2-DF start of 2-byte sequence
206: * 11100000-11101111 E0-EF start of 3-byte sequence
207: * 11110000-11110100 F0-F4 start of 4-byte sequence
208: *
209: * Returns 1 if more UTF-8 to come, 0 if not UTF-8.
210: */
211: int
212: utf8_open(struct utf8_data *utf8data, u_char ch)
213: {
214: memset(utf8data, 0, sizeof *utf8data);
215: if (ch >= 0xc2 && ch <= 0xdf)
216: utf8data->size = 2;
217: else if (ch >= 0xe0 && ch <= 0xef)
218: utf8data->size = 3;
219: else if (ch >= 0xf0 && ch <= 0xf4)
220: utf8data->size = 4;
221: else
222: return (0);
223: utf8_append(utf8data, ch);
224: return (1);
225: }
226:
227: /*
228: * Append character to UTF-8, closing if finished.
229: *
1.5 nicm 230: * Returns 1 if more UTF-8 data to come, 0 if finished.
1.4 nicm 231: */
232: int
233: utf8_append(struct utf8_data *utf8data, u_char ch)
234: {
235: if (utf8data->have >= utf8data->size)
236: fatalx("UTF-8 character overflow");
237: if (utf8data->size > sizeof utf8data->data)
238: fatalx("UTF-8 character size too large");
239:
240: utf8data->data[utf8data->have++] = ch;
241: if (utf8data->have != utf8data->size)
242: return (1);
243:
244: utf8data->width = utf8_width(utf8data);
245: return (0);
246: }
247:
248: /* Check if two width tree entries overlap. */
1.1 nicm 249: int
1.10 ! nicm 250: utf8_overlap(struct utf8_width_entry *item1, struct utf8_width_entry *item2)
1.1 nicm 251: {
252: if (item1->first >= item2->first && item1->first <= item2->last)
253: return (1);
254: if (item1->last >= item2->first && item1->last <= item2->last)
255: return (1);
256: if (item2->first >= item1->first && item2->first <= item1->last)
257: return (1);
258: if (item2->last >= item1->first && item2->last <= item1->last)
259: return (1);
260: return (0);
261: }
262:
1.4 nicm 263: /* Build UTF-8 width tree. */
1.1 nicm 264: void
265: utf8_build(void)
266: {
267: struct utf8_width_entry **ptr, *item, *node;
268: u_int i, j;
269:
270: for (i = 0; i < nitems(utf8_width_table); i++) {
271: item = &utf8_width_table[i];
272:
273: for (j = 0; j < nitems(utf8_width_table); j++) {
274: if (i != j && utf8_overlap(item, &utf8_width_table[j]))
275: log_fatalx("utf8 overlap: %u %u", i, j);
276: }
277:
278: ptr = &utf8_width_root;
279: while (*ptr != NULL) {
280: node = *ptr;
281: if (item->last < node->first)
282: ptr = &(node->left);
283: else if (item->first > node->last)
284: ptr = &(node->right);
285: }
286: *ptr = item;
287: }
288: }
289:
1.4 nicm 290: /* Combine UTF-8 into 32-bit Unicode. */
1.1 nicm 291: u_int
1.4 nicm 292: utf8_combine(const struct utf8_data *utf8data)
1.1 nicm 293: {
1.4 nicm 294: u_int value;
1.1 nicm 295:
1.4 nicm 296: value = 0xff;
297: switch (utf8data->size) {
298: case 1:
299: value = utf8data->data[0];
300: break;
301: case 2:
302: value = utf8data->data[1] & 0x3f;
303: value |= (utf8data->data[0] & 0x1f) << 6;
304: break;
305: case 3:
306: value = utf8data->data[2] & 0x3f;
307: value |= (utf8data->data[1] & 0x3f) << 6;
308: value |= (utf8data->data[0] & 0x0f) << 12;
309: break;
310: case 4:
311: value = utf8data->data[3] & 0x3f;
312: value |= (utf8data->data[2] & 0x3f) << 6;
313: value |= (utf8data->data[1] & 0x3f) << 12;
1.8 nicm 314: value |= (utf8data->data[0] & 0x07) << 18;
1.4 nicm 315: break;
1.1 nicm 316: }
1.4 nicm 317: return (value);
1.6 nicm 318: }
319:
320: /* Split a two-byte UTF-8 character. */
321: u_int
322: utf8_split2(u_int uc, u_char *ptr)
323: {
324: if (uc > 0x7f) {
325: ptr[0] = (uc >> 6) | 0xc0;
326: ptr[1] = (uc & 0x3f) | 0x80;
327: return (2);
328: }
329: ptr[0] = uc;
330: return (1);
1.1 nicm 331: }
332:
1.4 nicm 333: /* Lookup width of UTF-8 data in tree. */
334: u_int
335: utf8_width(const struct utf8_data *utf8data)
1.1 nicm 336: {
337: struct utf8_width_entry *item;
1.4 nicm 338: u_int value;
1.1 nicm 339:
1.4 nicm 340: value = utf8_combine(utf8data);
1.1 nicm 341:
342: item = utf8_width_root;
343: while (item != NULL) {
1.4 nicm 344: if (value < item->first)
1.1 nicm 345: item = item->left;
1.4 nicm 346: else if (value > item->last)
1.1 nicm 347: item = item->right;
348: else
349: return (item->width);
350: }
351: return (1);
1.9 nicm 352: }
353:
354: /*
355: * Encode len characters from src into dst, which is guaranteed to have four
356: * bytes available for each character from src (for \abc or UTF-8) plus space
357: * for \0.
358: */
359: int
360: utf8_strvis(char *dst, const char *src, size_t len, int flag)
361: {
362: struct utf8_data utf8data;
363: const char *start, *end;
364: int more;
365: size_t i;
366:
367: start = dst;
368: end = src + len;
369:
370: while (src < end) {
371: if (utf8_open(&utf8data, *src)) {
372: more = 1;
373: while (++src < end && more)
374: more = utf8_append(&utf8data, *src);
375: if (!more) {
376: /* UTF-8 character finished. */
377: for (i = 0; i < utf8data.size; i++)
378: *dst++ = utf8data.data[i];
379: continue;
380: } else if (utf8data.have > 0) {
381: /* Not a complete UTF-8 character. */
382: src -= utf8data.have;
383: }
384: }
385: if (src < end - 1)
386: dst = vis(dst, src[0], flag, src[1]);
387: else if (src < end)
388: dst = vis(dst, src[0], flag, '\0');
389: src++;
390: }
391:
392: *dst = '\0';
393: return (dst - start);
1.1 nicm 394: }
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