1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
|
/* $NetBSD: unvis.c,v 1.32 2010/11/27 21:22:11 christos Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: unvis.c,v 1.32 2010/11/27 21:22:11 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <stdint.h>
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <vis.h>
#ifdef __weak_alias
__weak_alias(strunvis,_strunvis)
#endif
#if !HAVE_VIS
/*
* decode driven by state machine
*/
#define S_GROUND 0 /* haven't seen escape char */
#define S_START 1 /* start decoding special sequence */
#define S_META 2 /* metachar started (M) */
#define S_META1 3 /* metachar more, regular char (-) */
#define S_CTRL 4 /* control char started (^) */
#define S_OCTAL2 5 /* octal digit 2 */
#define S_OCTAL3 6 /* octal digit 3 */
#define S_HEX1 7 /* http hex digit */
#define S_HEX2 8 /* http hex digit 2 */
#define S_MIME1 9 /* mime hex digit 1 */
#define S_MIME2 10 /* mime hex digit 2 */
#define S_EATCRNL 11 /* mime eating CRNL */
#define S_AMP 12 /* seen & */
#define S_NUMBER 13 /* collecting number */
#define S_STRING 14 /* collecting string */
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define xtod(c) (isdigit(c) ? (c - '0') : ((tolower(c) - 'a') + 10))
#define XTOD(c) (isdigit(c) ? (c - '0') : ((c - 'A') + 10))
/*
* RFC 1866
*/
static const struct nv {
const char *name;
uint8_t value;
} nv[] = {
{ "AElig", 198 }, /* capital AE diphthong (ligature) */
{ "Aacute", 193 }, /* capital A, acute accent */
{ "Acirc", 194 }, /* capital A, circumflex accent */
{ "Agrave", 192 }, /* capital A, grave accent */
{ "Aring", 197 }, /* capital A, ring */
{ "Atilde", 195 }, /* capital A, tilde */
{ "Auml", 196 }, /* capital A, dieresis or umlaut mark */
{ "Ccedil", 199 }, /* capital C, cedilla */
{ "ETH", 208 }, /* capital Eth, Icelandic */
{ "Eacute", 201 }, /* capital E, acute accent */
{ "Ecirc", 202 }, /* capital E, circumflex accent */
{ "Egrave", 200 }, /* capital E, grave accent */
{ "Euml", 203 }, /* capital E, dieresis or umlaut mark */
{ "Iacute", 205 }, /* capital I, acute accent */
{ "Icirc", 206 }, /* capital I, circumflex accent */
{ "Igrave", 204 }, /* capital I, grave accent */
{ "Iuml", 207 }, /* capital I, dieresis or umlaut mark */
{ "Ntilde", 209 }, /* capital N, tilde */
{ "Oacute", 211 }, /* capital O, acute accent */
{ "Ocirc", 212 }, /* capital O, circumflex accent */
{ "Ograve", 210 }, /* capital O, grave accent */
{ "Oslash", 216 }, /* capital O, slash */
{ "Otilde", 213 }, /* capital O, tilde */
{ "Ouml", 214 }, /* capital O, dieresis or umlaut mark */
{ "THORN", 222 }, /* capital THORN, Icelandic */
{ "Uacute", 218 }, /* capital U, acute accent */
{ "Ucirc", 219 }, /* capital U, circumflex accent */
{ "Ugrave", 217 }, /* capital U, grave accent */
{ "Uuml", 220 }, /* capital U, dieresis or umlaut mark */
{ "Yacute", 221 }, /* capital Y, acute accent */
{ "aacute", 225 }, /* small a, acute accent */
{ "acirc", 226 }, /* small a, circumflex accent */
{ "acute", 180 }, /* acute accent */
{ "aelig", 230 }, /* small ae diphthong (ligature) */
{ "agrave", 224 }, /* small a, grave accent */
{ "amp", 38 }, /* ampersand */
{ "aring", 229 }, /* small a, ring */
{ "atilde", 227 }, /* small a, tilde */
{ "auml", 228 }, /* small a, dieresis or umlaut mark */
{ "brvbar", 166 }, /* broken (vertical) bar */
{ "ccedil", 231 }, /* small c, cedilla */
{ "cedil", 184 }, /* cedilla */
{ "cent", 162 }, /* cent sign */
{ "copy", 169 }, /* copyright sign */
{ "curren", 164 }, /* general currency sign */
{ "deg", 176 }, /* degree sign */
{ "divide", 247 }, /* divide sign */
{ "eacute", 233 }, /* small e, acute accent */
{ "ecirc", 234 }, /* small e, circumflex accent */
{ "egrave", 232 }, /* small e, grave accent */
{ "eth", 240 }, /* small eth, Icelandic */
{ "euml", 235 }, /* small e, dieresis or umlaut mark */
{ "frac12", 189 }, /* fraction one-half */
{ "frac14", 188 }, /* fraction one-quarter */
{ "frac34", 190 }, /* fraction three-quarters */
{ "gt", 62 }, /* greater than */
{ "iacute", 237 }, /* small i, acute accent */
{ "icirc", 238 }, /* small i, circumflex accent */
{ "iexcl", 161 }, /* inverted exclamation mark */
{ "igrave", 236 }, /* small i, grave accent */
{ "iquest", 191 }, /* inverted question mark */
{ "iuml", 239 }, /* small i, dieresis or umlaut mark */
{ "laquo", 171 }, /* angle quotation mark, left */
{ "lt", 60 }, /* less than */
{ "macr", 175 }, /* macron */
{ "micro", 181 }, /* micro sign */
{ "middot", 183 }, /* middle dot */
{ "nbsp", 160 }, /* no-break space */
{ "not", 172 }, /* not sign */
{ "ntilde", 241 }, /* small n, tilde */
{ "oacute", 243 }, /* small o, acute accent */
{ "ocirc", 244 }, /* small o, circumflex accent */
{ "ograve", 242 }, /* small o, grave accent */
{ "ordf", 170 }, /* ordinal indicator, feminine */
{ "ordm", 186 }, /* ordinal indicator, masculine */
{ "oslash", 248 }, /* small o, slash */
{ "otilde", 245 }, /* small o, tilde */
{ "ouml", 246 }, /* small o, dieresis or umlaut mark */
{ "para", 182 }, /* pilcrow (paragraph sign) */
{ "plusmn", 177 }, /* plus-or-minus sign */
{ "pound", 163 }, /* pound sterling sign */
{ "quot", 34 }, /* double quote */
{ "raquo", 187 }, /* angle quotation mark, right */
{ "reg", 174 }, /* registered sign */
{ "sect", 167 }, /* section sign */
{ "shy", 173 }, /* soft hyphen */
{ "sup1", 185 }, /* superscript one */
{ "sup2", 178 }, /* superscript two */
{ "sup3", 179 }, /* superscript three */
{ "szlig", 223 }, /* small sharp s, German (sz ligature) */
{ "thorn", 254 }, /* small thorn, Icelandic */
{ "times", 215 }, /* multiply sign */
{ "uacute", 250 }, /* small u, acute accent */
{ "ucirc", 251 }, /* small u, circumflex accent */
{ "ugrave", 249 }, /* small u, grave accent */
{ "uml", 168 }, /* umlaut (dieresis) */
{ "uuml", 252 }, /* small u, dieresis or umlaut mark */
{ "yacute", 253 }, /* small y, acute accent */
{ "yen", 165 }, /* yen sign */
{ "yuml", 255 }, /* small y, dieresis or umlaut mark */
};
/*
* unvis - decode characters previously encoded by vis
*/
int
unvis(char *cp, int c, int *astate, int flag)
{
unsigned char uc = (unsigned char)c;
unsigned char st, ia, is, lc;
/*
* Bottom 8 bits of astate hold the state machine state.
* Top 8 bits hold the current character in the http 1866 nv string decoding
*/
#define GS(a) ((a) & 0xff)
#define SS(a, b) (((uint32_t)(a) << 24) | (b))
#define GI(a) ((uint32_t)(a) >> 24)
_DIAGASSERT(cp != NULL);
_DIAGASSERT(astate != NULL);
st = GS(*astate);
if (flag & UNVIS_END) {
switch (st) {
case S_OCTAL2:
case S_OCTAL3:
case S_HEX2:
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case S_GROUND:
return UNVIS_NOCHAR;
default:
return UNVIS_SYNBAD;
}
}
switch (st) {
case S_GROUND:
*cp = 0;
if ((flag & VIS_NOESCAPE) == 0 && c == '\\') {
*astate = SS(0, S_START);
return UNVIS_NOCHAR;
}
if ((flag & VIS_HTTP1808) && c == '%') {
*astate = SS(0, S_HEX1);
return UNVIS_NOCHAR;
}
if ((flag & VIS_HTTP1866) && c == '&') {
*astate = SS(0, S_AMP);
return UNVIS_NOCHAR;
}
if ((flag & VIS_MIMESTYLE) && c == '=') {
*astate = SS(0, S_MIME1);
return UNVIS_NOCHAR;
}
*cp = c;
return UNVIS_VALID;
case S_START:
switch(c) {
case '\\':
*cp = c;
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
*cp = (c - '0');
*astate = SS(0, S_OCTAL2);
return UNVIS_NOCHAR;
case 'M':
*cp = (char)0200;
*astate = SS(0, S_META);
return UNVIS_NOCHAR;
case '^':
*astate = SS(0, S_CTRL);
return UNVIS_NOCHAR;
case 'n':
*cp = '\n';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 'r':
*cp = '\r';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 'b':
*cp = '\b';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 'a':
*cp = '\007';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 'v':
*cp = '\v';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 't':
*cp = '\t';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 'f':
*cp = '\f';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 's':
*cp = ' ';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case 'E':
*cp = '\033';
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case '\n':
/*
* hidden newline
*/
*astate = SS(0, S_GROUND);
return UNVIS_NOCHAR;
case '$':
/*
* hidden marker
*/
*astate = SS(0, S_GROUND);
return UNVIS_NOCHAR;
}
goto bad;
case S_META:
if (c == '-')
*astate = SS(0, S_META1);
else if (c == '^')
*astate = SS(0, S_CTRL);
else
goto bad;
return UNVIS_NOCHAR;
case S_META1:
*astate = SS(0, S_GROUND);
*cp |= c;
return UNVIS_VALID;
case S_CTRL:
if (c == '?')
*cp |= 0177;
else
*cp |= c & 037;
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case S_OCTAL2: /* second possible octal digit */
if (isoctal(uc)) {
/*
* yes - and maybe a third
*/
*cp = (*cp << 3) + (c - '0');
*astate = SS(0, S_OCTAL3);
return UNVIS_NOCHAR;
}
/*
* no - done with current sequence, push back passed char
*/
*astate = SS(0, S_GROUND);
return UNVIS_VALIDPUSH;
case S_OCTAL3: /* third possible octal digit */
*astate = SS(0, S_GROUND);
if (isoctal(uc)) {
*cp = (*cp << 3) + (c - '0');
return UNVIS_VALID;
}
/*
* we were done, push back passed char
*/
return UNVIS_VALIDPUSH;
case S_HEX1:
if (isxdigit(uc)) {
*cp = xtod(uc);
*astate = SS(0, S_HEX2);
return UNVIS_NOCHAR;
}
/*
* no - done with current sequence, push back passed char
*/
*astate = SS(0, S_GROUND);
return UNVIS_VALIDPUSH;
case S_HEX2:
*astate = S_GROUND;
if (isxdigit(uc)) {
*cp = xtod(uc) | (*cp << 4);
return UNVIS_VALID;
}
return UNVIS_VALIDPUSH;
case S_MIME1:
if (uc == '\n' || uc == '\r') {
*astate = SS(0, S_EATCRNL);
return UNVIS_NOCHAR;
}
if (isxdigit(uc) && (isdigit(uc) || isupper(uc))) {
*cp = XTOD(uc);
*astate = SS(0, S_MIME2);
return UNVIS_NOCHAR;
}
goto bad;
case S_MIME2:
if (isxdigit(uc) && (isdigit(uc) || isupper(uc))) {
*astate = SS(0, S_GROUND);
*cp = XTOD(uc) | (*cp << 4);
return UNVIS_VALID;
}
goto bad;
case S_EATCRNL:
switch (uc) {
case '\r':
case '\n':
return UNVIS_NOCHAR;
case '=':
*astate = SS(0, S_MIME1);
return UNVIS_NOCHAR;
default:
*cp = uc;
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
}
case S_AMP:
*cp = 0;
if (uc == '#') {
*astate = SS(0, S_NUMBER);
return UNVIS_NOCHAR;
}
*astate = SS(0, S_STRING);
/*FALLTHROUGH*/
case S_STRING:
ia = *cp; /* index in the array */
is = GI(*astate); /* index in the string */
lc = is == 0 ? 0 : nv[ia].name[is - 1]; /* last character */
if (uc == ';')
uc = '\0';
for (; ia < __arraycount(nv); ia++) {
if (is != 0 && nv[ia].name[is - 1] != lc)
goto bad;
if (nv[ia].name[is] == uc)
break;
}
if (*cp == __arraycount(nv))
goto bad;
if (uc != 0) {
*cp = ia;
*astate = SS(is + 1, S_STRING);
return UNVIS_NOCHAR;
}
*cp = nv[ia].value;
*astate = SS(0, S_GROUND);
return UNVIS_VALID;
case S_NUMBER:
if (uc == ';')
return UNVIS_VALID;
if (!isdigit(uc))
goto bad;
*cp += (*cp * 10) + uc - '0';
return UNVIS_NOCHAR;
default:
bad:
/*
* decoder in unknown state - (probably uninitialized)
*/
*astate = SS(0, S_GROUND);
return UNVIS_SYNBAD;
}
}
/*
* strunvis - decode src into dst
*
* Number of chars decoded into dst is returned, -1 on error.
* Dst is null terminated.
*/
int
strunvisx(char *dst, const char *src, int flag)
{
char c;
char *start = dst;
int state = 0;
_DIAGASSERT(src != NULL);
_DIAGASSERT(dst != NULL);
while ((c = *src++) != '\0') {
again:
switch (unvis(dst, c, &state, flag)) {
case UNVIS_VALID:
dst++;
break;
case UNVIS_VALIDPUSH:
dst++;
goto again;
case 0:
case UNVIS_NOCHAR:
break;
default:
return (-1);
}
}
if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
dst++;
*dst = '\0';
return (int)(dst - start);
}
int
strunvis(char *dst, const char *src)
{
return strunvisx(dst, src, 0);
}
#endif
|