| 1 |
/* $NetBSD: unvis.c,v 1.44 2014/09/26 15:43:36 roy Exp $ */ |
| 2 |
|
| 3 |
/*- |
| 4 |
* Copyright (c) 1989, 1993 |
| 5 |
* The Regents of the University of California. All rights reserved. |
| 6 |
* |
| 7 |
* Redistribution and use in source and binary forms, with or without |
| 8 |
* modification, are permitted provided that the following conditions |
| 9 |
* are met: |
| 10 |
* 1. Redistributions of source code must retain the above copyright |
| 11 |
* notice, this list of conditions and the following disclaimer. |
| 12 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 13 |
* notice, this list of conditions and the following disclaimer in the |
| 14 |
* documentation and/or other materials provided with the distribution. |
| 15 |
* 3. Neither the name of the University nor the names of its contributors |
| 16 |
* may be used to endorse or promote products derived from this software |
| 17 |
* without specific prior written permission. |
| 18 |
* |
| 19 |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 |
* SUCH DAMAGE. |
| 30 |
*/ |
| 31 |
|
| 32 |
#include <sys/cdefs.h> |
| 33 |
#if defined(LIBC_SCCS) && !defined(lint) |
| 34 |
#if 0 |
| 35 |
static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93"; |
| 36 |
#else |
| 37 |
__RCSID("$NetBSD: unvis.c,v 1.44 2014/09/26 15:43:36 roy Exp $"); |
| 38 |
#endif |
| 39 |
#endif /* LIBC_SCCS and not lint */ |
| 40 |
__FBSDID("$FreeBSD: stable/10/contrib/libc-vis/unvis.c 326324 2017-11-28 17:20:53Z brooks $"); |
| 41 |
|
| 42 |
#include "namespace.h" |
| 43 |
#include <sys/types.h> |
| 44 |
|
| 45 |
#include <assert.h> |
| 46 |
#include <ctype.h> |
| 47 |
#include <stdint.h> |
| 48 |
#include <stdio.h> |
| 49 |
#include <errno.h> |
| 50 |
#include <vis.h> |
| 51 |
|
| 52 |
#define _DIAGASSERT(x) assert(x) |
| 53 |
|
| 54 |
/* |
| 55 |
* Return the number of elements in a statically-allocated array, |
| 56 |
* __x. |
| 57 |
*/ |
| 58 |
#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) |
| 59 |
|
| 60 |
#ifdef __weak_alias |
| 61 |
__weak_alias(strnunvisx,_strnunvisx) |
| 62 |
#endif |
| 63 |
|
| 64 |
#if !HAVE_VIS |
| 65 |
/* |
| 66 |
* decode driven by state machine |
| 67 |
*/ |
| 68 |
#define S_GROUND 0 /* haven't seen escape char */ |
| 69 |
#define S_START 1 /* start decoding special sequence */ |
| 70 |
#define S_META 2 /* metachar started (M) */ |
| 71 |
#define S_META1 3 /* metachar more, regular char (-) */ |
| 72 |
#define S_CTRL 4 /* control char started (^) */ |
| 73 |
#define S_OCTAL2 5 /* octal digit 2 */ |
| 74 |
#define S_OCTAL3 6 /* octal digit 3 */ |
| 75 |
#define S_HEX 7 /* mandatory hex digit */ |
| 76 |
#define S_HEX1 8 /* http hex digit */ |
| 77 |
#define S_HEX2 9 /* http hex digit 2 */ |
| 78 |
#define S_MIME1 10 /* mime hex digit 1 */ |
| 79 |
#define S_MIME2 11 /* mime hex digit 2 */ |
| 80 |
#define S_EATCRNL 12 /* mime eating CRNL */ |
| 81 |
#define S_AMP 13 /* seen & */ |
| 82 |
#define S_NUMBER 14 /* collecting number */ |
| 83 |
#define S_STRING 15 /* collecting string */ |
| 84 |
|
| 85 |
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') |
| 86 |
#define xtod(c) (isdigit(c) ? (c - '0') : ((tolower(c) - 'a') + 10)) |
| 87 |
#define XTOD(c) (isdigit(c) ? (c - '0') : ((c - 'A') + 10)) |
| 88 |
|
| 89 |
/* |
| 90 |
* RFC 1866 |
| 91 |
*/ |
| 92 |
static const struct nv { |
| 93 |
char name[7]; |
| 94 |
uint8_t value; |
| 95 |
} nv[] = { |
| 96 |
{ "AElig", 198 }, /* capital AE diphthong (ligature) */ |
| 97 |
{ "Aacute", 193 }, /* capital A, acute accent */ |
| 98 |
{ "Acirc", 194 }, /* capital A, circumflex accent */ |
| 99 |
{ "Agrave", 192 }, /* capital A, grave accent */ |
| 100 |
{ "Aring", 197 }, /* capital A, ring */ |
| 101 |
{ "Atilde", 195 }, /* capital A, tilde */ |
| 102 |
{ "Auml", 196 }, /* capital A, dieresis or umlaut mark */ |
| 103 |
{ "Ccedil", 199 }, /* capital C, cedilla */ |
| 104 |
{ "ETH", 208 }, /* capital Eth, Icelandic */ |
| 105 |
{ "Eacute", 201 }, /* capital E, acute accent */ |
| 106 |
{ "Ecirc", 202 }, /* capital E, circumflex accent */ |
| 107 |
{ "Egrave", 200 }, /* capital E, grave accent */ |
| 108 |
{ "Euml", 203 }, /* capital E, dieresis or umlaut mark */ |
| 109 |
{ "Iacute", 205 }, /* capital I, acute accent */ |
| 110 |
{ "Icirc", 206 }, /* capital I, circumflex accent */ |
| 111 |
{ "Igrave", 204 }, /* capital I, grave accent */ |
| 112 |
{ "Iuml", 207 }, /* capital I, dieresis or umlaut mark */ |
| 113 |
{ "Ntilde", 209 }, /* capital N, tilde */ |
| 114 |
{ "Oacute", 211 }, /* capital O, acute accent */ |
| 115 |
{ "Ocirc", 212 }, /* capital O, circumflex accent */ |
| 116 |
{ "Ograve", 210 }, /* capital O, grave accent */ |
| 117 |
{ "Oslash", 216 }, /* capital O, slash */ |
| 118 |
{ "Otilde", 213 }, /* capital O, tilde */ |
| 119 |
{ "Ouml", 214 }, /* capital O, dieresis or umlaut mark */ |
| 120 |
{ "THORN", 222 }, /* capital THORN, Icelandic */ |
| 121 |
{ "Uacute", 218 }, /* capital U, acute accent */ |
| 122 |
{ "Ucirc", 219 }, /* capital U, circumflex accent */ |
| 123 |
{ "Ugrave", 217 }, /* capital U, grave accent */ |
| 124 |
{ "Uuml", 220 }, /* capital U, dieresis or umlaut mark */ |
| 125 |
{ "Yacute", 221 }, /* capital Y, acute accent */ |
| 126 |
{ "aacute", 225 }, /* small a, acute accent */ |
| 127 |
{ "acirc", 226 }, /* small a, circumflex accent */ |
| 128 |
{ "acute", 180 }, /* acute accent */ |
| 129 |
{ "aelig", 230 }, /* small ae diphthong (ligature) */ |
| 130 |
{ "agrave", 224 }, /* small a, grave accent */ |
| 131 |
{ "amp", 38 }, /* ampersand */ |
| 132 |
{ "aring", 229 }, /* small a, ring */ |
| 133 |
{ "atilde", 227 }, /* small a, tilde */ |
| 134 |
{ "auml", 228 }, /* small a, dieresis or umlaut mark */ |
| 135 |
{ "brvbar", 166 }, /* broken (vertical) bar */ |
| 136 |
{ "ccedil", 231 }, /* small c, cedilla */ |
| 137 |
{ "cedil", 184 }, /* cedilla */ |
| 138 |
{ "cent", 162 }, /* cent sign */ |
| 139 |
{ "copy", 169 }, /* copyright sign */ |
| 140 |
{ "curren", 164 }, /* general currency sign */ |
| 141 |
{ "deg", 176 }, /* degree sign */ |
| 142 |
{ "divide", 247 }, /* divide sign */ |
| 143 |
{ "eacute", 233 }, /* small e, acute accent */ |
| 144 |
{ "ecirc", 234 }, /* small e, circumflex accent */ |
| 145 |
{ "egrave", 232 }, /* small e, grave accent */ |
| 146 |
{ "eth", 240 }, /* small eth, Icelandic */ |
| 147 |
{ "euml", 235 }, /* small e, dieresis or umlaut mark */ |
| 148 |
{ "frac12", 189 }, /* fraction one-half */ |
| 149 |
{ "frac14", 188 }, /* fraction one-quarter */ |
| 150 |
{ "frac34", 190 }, /* fraction three-quarters */ |
| 151 |
{ "gt", 62 }, /* greater than */ |
| 152 |
{ "iacute", 237 }, /* small i, acute accent */ |
| 153 |
{ "icirc", 238 }, /* small i, circumflex accent */ |
| 154 |
{ "iexcl", 161 }, /* inverted exclamation mark */ |
| 155 |
{ "igrave", 236 }, /* small i, grave accent */ |
| 156 |
{ "iquest", 191 }, /* inverted question mark */ |
| 157 |
{ "iuml", 239 }, /* small i, dieresis or umlaut mark */ |
| 158 |
{ "laquo", 171 }, /* angle quotation mark, left */ |
| 159 |
{ "lt", 60 }, /* less than */ |
| 160 |
{ "macr", 175 }, /* macron */ |
| 161 |
{ "micro", 181 }, /* micro sign */ |
| 162 |
{ "middot", 183 }, /* middle dot */ |
| 163 |
{ "nbsp", 160 }, /* no-break space */ |
| 164 |
{ "not", 172 }, /* not sign */ |
| 165 |
{ "ntilde", 241 }, /* small n, tilde */ |
| 166 |
{ "oacute", 243 }, /* small o, acute accent */ |
| 167 |
{ "ocirc", 244 }, /* small o, circumflex accent */ |
| 168 |
{ "ograve", 242 }, /* small o, grave accent */ |
| 169 |
{ "ordf", 170 }, /* ordinal indicator, feminine */ |
| 170 |
{ "ordm", 186 }, /* ordinal indicator, masculine */ |
| 171 |
{ "oslash", 248 }, /* small o, slash */ |
| 172 |
{ "otilde", 245 }, /* small o, tilde */ |
| 173 |
{ "ouml", 246 }, /* small o, dieresis or umlaut mark */ |
| 174 |
{ "para", 182 }, /* pilcrow (paragraph sign) */ |
| 175 |
{ "plusmn", 177 }, /* plus-or-minus sign */ |
| 176 |
{ "pound", 163 }, /* pound sterling sign */ |
| 177 |
{ "quot", 34 }, /* double quote */ |
| 178 |
{ "raquo", 187 }, /* angle quotation mark, right */ |
| 179 |
{ "reg", 174 }, /* registered sign */ |
| 180 |
{ "sect", 167 }, /* section sign */ |
| 181 |
{ "shy", 173 }, /* soft hyphen */ |
| 182 |
{ "sup1", 185 }, /* superscript one */ |
| 183 |
{ "sup2", 178 }, /* superscript two */ |
| 184 |
{ "sup3", 179 }, /* superscript three */ |
| 185 |
{ "szlig", 223 }, /* small sharp s, German (sz ligature) */ |
| 186 |
{ "thorn", 254 }, /* small thorn, Icelandic */ |
| 187 |
{ "times", 215 }, /* multiply sign */ |
| 188 |
{ "uacute", 250 }, /* small u, acute accent */ |
| 189 |
{ "ucirc", 251 }, /* small u, circumflex accent */ |
| 190 |
{ "ugrave", 249 }, /* small u, grave accent */ |
| 191 |
{ "uml", 168 }, /* umlaut (dieresis) */ |
| 192 |
{ "uuml", 252 }, /* small u, dieresis or umlaut mark */ |
| 193 |
{ "yacute", 253 }, /* small y, acute accent */ |
| 194 |
{ "yen", 165 }, /* yen sign */ |
| 195 |
{ "yuml", 255 }, /* small y, dieresis or umlaut mark */ |
| 196 |
}; |
| 197 |
|
| 198 |
/* |
| 199 |
* unvis - decode characters previously encoded by vis |
| 200 |
*/ |
| 201 |
int |
| 202 |
unvis(char *cp, int c, int *astate, int flag) |
| 203 |
{ |
| 204 |
unsigned char uc = (unsigned char)c; |
| 205 |
unsigned char st, ia, is, lc; |
| 206 |
|
| 207 |
/* |
| 208 |
* Bottom 8 bits of astate hold the state machine state. |
| 209 |
* Top 8 bits hold the current character in the http 1866 nv string decoding |
| 210 |
*/ |
| 211 |
#define GS(a) ((a) & 0xff) |
| 212 |
#define SS(a, b) (((uint32_t)(a) << 24) | (b)) |
| 213 |
#define GI(a) ((uint32_t)(a) >> 24) |
| 214 |
|
| 215 |
_DIAGASSERT(cp != NULL); |
| 216 |
_DIAGASSERT(astate != NULL); |
| 217 |
st = GS(*astate); |
| 218 |
|
| 219 |
if (flag & UNVIS_END) { |
| 220 |
switch (st) { |
| 221 |
case S_OCTAL2: |
| 222 |
case S_OCTAL3: |
| 223 |
case S_HEX2: |
| 224 |
*astate = SS(0, S_GROUND); |
| 225 |
return UNVIS_VALID; |
| 226 |
case S_GROUND: |
| 227 |
return UNVIS_NOCHAR; |
| 228 |
default: |
| 229 |
return UNVIS_SYNBAD; |
| 230 |
} |
| 231 |
} |
| 232 |
|
| 233 |
switch (st) { |
| 234 |
|
| 235 |
case S_GROUND: |
| 236 |
*cp = 0; |
| 237 |
if ((flag & VIS_NOESCAPE) == 0 && c == '\\') { |
| 238 |
*astate = SS(0, S_START); |
| 239 |
return UNVIS_NOCHAR; |
| 240 |
} |
| 241 |
if ((flag & VIS_HTTP1808) && c == '%') { |
| 242 |
*astate = SS(0, S_HEX1); |
| 243 |
return UNVIS_NOCHAR; |
| 244 |
} |
| 245 |
if ((flag & VIS_HTTP1866) && c == '&') { |
| 246 |
*astate = SS(0, S_AMP); |
| 247 |
return UNVIS_NOCHAR; |
| 248 |
} |
| 249 |
if ((flag & VIS_MIMESTYLE) && c == '=') { |
| 250 |
*astate = SS(0, S_MIME1); |
| 251 |
return UNVIS_NOCHAR; |
| 252 |
} |
| 253 |
*cp = c; |
| 254 |
return UNVIS_VALID; |
| 255 |
|
| 256 |
case S_START: |
| 257 |
switch(c) { |
| 258 |
case '\\': |
| 259 |
*cp = c; |
| 260 |
*astate = SS(0, S_GROUND); |
| 261 |
return UNVIS_VALID; |
| 262 |
case '0': case '1': case '2': case '3': |
| 263 |
case '4': case '5': case '6': case '7': |
| 264 |
*cp = (c - '0'); |
| 265 |
*astate = SS(0, S_OCTAL2); |
| 266 |
return UNVIS_NOCHAR; |
| 267 |
case 'M': |
| 268 |
*cp = (char)0200; |
| 269 |
*astate = SS(0, S_META); |
| 270 |
return UNVIS_NOCHAR; |
| 271 |
case '^': |
| 272 |
*astate = SS(0, S_CTRL); |
| 273 |
return UNVIS_NOCHAR; |
| 274 |
case 'n': |
| 275 |
*cp = '\n'; |
| 276 |
*astate = SS(0, S_GROUND); |
| 277 |
return UNVIS_VALID; |
| 278 |
case 'r': |
| 279 |
*cp = '\r'; |
| 280 |
*astate = SS(0, S_GROUND); |
| 281 |
return UNVIS_VALID; |
| 282 |
case 'b': |
| 283 |
*cp = '\b'; |
| 284 |
*astate = SS(0, S_GROUND); |
| 285 |
return UNVIS_VALID; |
| 286 |
case 'a': |
| 287 |
*cp = '\007'; |
| 288 |
*astate = SS(0, S_GROUND); |
| 289 |
return UNVIS_VALID; |
| 290 |
case 'v': |
| 291 |
*cp = '\v'; |
| 292 |
*astate = SS(0, S_GROUND); |
| 293 |
return UNVIS_VALID; |
| 294 |
case 't': |
| 295 |
*cp = '\t'; |
| 296 |
*astate = SS(0, S_GROUND); |
| 297 |
return UNVIS_VALID; |
| 298 |
case 'f': |
| 299 |
*cp = '\f'; |
| 300 |
*astate = SS(0, S_GROUND); |
| 301 |
return UNVIS_VALID; |
| 302 |
case 's': |
| 303 |
*cp = ' '; |
| 304 |
*astate = SS(0, S_GROUND); |
| 305 |
return UNVIS_VALID; |
| 306 |
case 'E': |
| 307 |
*cp = '\033'; |
| 308 |
*astate = SS(0, S_GROUND); |
| 309 |
return UNVIS_VALID; |
| 310 |
case 'x': |
| 311 |
*astate = SS(0, S_HEX); |
| 312 |
return UNVIS_NOCHAR; |
| 313 |
case '\n': |
| 314 |
/* |
| 315 |
* hidden newline |
| 316 |
*/ |
| 317 |
*astate = SS(0, S_GROUND); |
| 318 |
return UNVIS_NOCHAR; |
| 319 |
case '$': |
| 320 |
/* |
| 321 |
* hidden marker |
| 322 |
*/ |
| 323 |
*astate = SS(0, S_GROUND); |
| 324 |
return UNVIS_NOCHAR; |
| 325 |
default: |
| 326 |
if (isgraph(c)) { |
| 327 |
*cp = c; |
| 328 |
*astate = SS(0, S_GROUND); |
| 329 |
return UNVIS_VALID; |
| 330 |
} |
| 331 |
} |
| 332 |
goto bad; |
| 333 |
|
| 334 |
case S_META: |
| 335 |
if (c == '-') |
| 336 |
*astate = SS(0, S_META1); |
| 337 |
else if (c == '^') |
| 338 |
*astate = SS(0, S_CTRL); |
| 339 |
else |
| 340 |
goto bad; |
| 341 |
return UNVIS_NOCHAR; |
| 342 |
|
| 343 |
case S_META1: |
| 344 |
*astate = SS(0, S_GROUND); |
| 345 |
*cp |= c; |
| 346 |
return UNVIS_VALID; |
| 347 |
|
| 348 |
case S_CTRL: |
| 349 |
if (c == '?') |
| 350 |
*cp |= 0177; |
| 351 |
else |
| 352 |
*cp |= c & 037; |
| 353 |
*astate = SS(0, S_GROUND); |
| 354 |
return UNVIS_VALID; |
| 355 |
|
| 356 |
case S_OCTAL2: /* second possible octal digit */ |
| 357 |
if (isoctal(uc)) { |
| 358 |
/* |
| 359 |
* yes - and maybe a third |
| 360 |
*/ |
| 361 |
*cp = (*cp << 3) + (c - '0'); |
| 362 |
*astate = SS(0, S_OCTAL3); |
| 363 |
return UNVIS_NOCHAR; |
| 364 |
} |
| 365 |
/* |
| 366 |
* no - done with current sequence, push back passed char |
| 367 |
*/ |
| 368 |
*astate = SS(0, S_GROUND); |
| 369 |
return UNVIS_VALIDPUSH; |
| 370 |
|
| 371 |
case S_OCTAL3: /* third possible octal digit */ |
| 372 |
*astate = SS(0, S_GROUND); |
| 373 |
if (isoctal(uc)) { |
| 374 |
*cp = (*cp << 3) + (c - '0'); |
| 375 |
return UNVIS_VALID; |
| 376 |
} |
| 377 |
/* |
| 378 |
* we were done, push back passed char |
| 379 |
*/ |
| 380 |
return UNVIS_VALIDPUSH; |
| 381 |
|
| 382 |
case S_HEX: |
| 383 |
if (!isxdigit(uc)) |
| 384 |
goto bad; |
| 385 |
/*FALLTHROUGH*/ |
| 386 |
case S_HEX1: |
| 387 |
if (isxdigit(uc)) { |
| 388 |
*cp = xtod(uc); |
| 389 |
*astate = SS(0, S_HEX2); |
| 390 |
return UNVIS_NOCHAR; |
| 391 |
} |
| 392 |
/* |
| 393 |
* no - done with current sequence, push back passed char |
| 394 |
*/ |
| 395 |
*astate = SS(0, S_GROUND); |
| 396 |
return UNVIS_VALIDPUSH; |
| 397 |
|
| 398 |
case S_HEX2: |
| 399 |
*astate = S_GROUND; |
| 400 |
if (isxdigit(uc)) { |
| 401 |
*cp = xtod(uc) | (*cp << 4); |
| 402 |
return UNVIS_VALID; |
| 403 |
} |
| 404 |
return UNVIS_VALIDPUSH; |
| 405 |
|
| 406 |
case S_MIME1: |
| 407 |
if (uc == '\n' || uc == '\r') { |
| 408 |
*astate = SS(0, S_EATCRNL); |
| 409 |
return UNVIS_NOCHAR; |
| 410 |
} |
| 411 |
if (isxdigit(uc) && (isdigit(uc) || isupper(uc))) { |
| 412 |
*cp = XTOD(uc); |
| 413 |
*astate = SS(0, S_MIME2); |
| 414 |
return UNVIS_NOCHAR; |
| 415 |
} |
| 416 |
goto bad; |
| 417 |
|
| 418 |
case S_MIME2: |
| 419 |
if (isxdigit(uc) && (isdigit(uc) || isupper(uc))) { |
| 420 |
*astate = SS(0, S_GROUND); |
| 421 |
*cp = XTOD(uc) | (*cp << 4); |
| 422 |
return UNVIS_VALID; |
| 423 |
} |
| 424 |
goto bad; |
| 425 |
|
| 426 |
case S_EATCRNL: |
| 427 |
switch (uc) { |
| 428 |
case '\r': |
| 429 |
case '\n': |
| 430 |
return UNVIS_NOCHAR; |
| 431 |
case '=': |
| 432 |
*astate = SS(0, S_MIME1); |
| 433 |
return UNVIS_NOCHAR; |
| 434 |
default: |
| 435 |
*cp = uc; |
| 436 |
*astate = SS(0, S_GROUND); |
| 437 |
return UNVIS_VALID; |
| 438 |
} |
| 439 |
|
| 440 |
case S_AMP: |
| 441 |
*cp = 0; |
| 442 |
if (uc == '#') { |
| 443 |
*astate = SS(0, S_NUMBER); |
| 444 |
return UNVIS_NOCHAR; |
| 445 |
} |
| 446 |
*astate = SS(0, S_STRING); |
| 447 |
/*FALLTHROUGH*/ |
| 448 |
|
| 449 |
case S_STRING: |
| 450 |
ia = *cp; /* index in the array */ |
| 451 |
is = GI(*astate); /* index in the string */ |
| 452 |
lc = is == 0 ? 0 : nv[ia].name[is - 1]; /* last character */ |
| 453 |
|
| 454 |
if (uc == ';') |
| 455 |
uc = '\0'; |
| 456 |
|
| 457 |
for (; ia < __arraycount(nv); ia++) { |
| 458 |
if (is != 0 && nv[ia].name[is - 1] != lc) |
| 459 |
goto bad; |
| 460 |
if (nv[ia].name[is] == uc) |
| 461 |
break; |
| 462 |
} |
| 463 |
|
| 464 |
if (ia == __arraycount(nv)) |
| 465 |
goto bad; |
| 466 |
|
| 467 |
if (uc != 0) { |
| 468 |
*cp = ia; |
| 469 |
*astate = SS(is + 1, S_STRING); |
| 470 |
return UNVIS_NOCHAR; |
| 471 |
} |
| 472 |
|
| 473 |
*cp = nv[ia].value; |
| 474 |
*astate = SS(0, S_GROUND); |
| 475 |
return UNVIS_VALID; |
| 476 |
|
| 477 |
case S_NUMBER: |
| 478 |
if (uc == ';') |
| 479 |
return UNVIS_VALID; |
| 480 |
if (!isdigit(uc)) |
| 481 |
goto bad; |
| 482 |
*cp += (*cp * 10) + uc - '0'; |
| 483 |
return UNVIS_NOCHAR; |
| 484 |
|
| 485 |
default: |
| 486 |
bad: |
| 487 |
/* |
| 488 |
* decoder in unknown state - (probably uninitialized) |
| 489 |
*/ |
| 490 |
*astate = SS(0, S_GROUND); |
| 491 |
return UNVIS_SYNBAD; |
| 492 |
} |
| 493 |
} |
| 494 |
|
| 495 |
/* |
| 496 |
* strnunvisx - decode src into dst |
| 497 |
* |
| 498 |
* Number of chars decoded into dst is returned, -1 on error. |
| 499 |
* Dst is null terminated. |
| 500 |
*/ |
| 501 |
|
| 502 |
int |
| 503 |
strnunvisx(char *dst, size_t dlen, const char *src, int flag) |
| 504 |
{ |
| 505 |
char c; |
| 506 |
char t = '\0', *start = dst; |
| 507 |
int state = 0; |
| 508 |
|
| 509 |
_DIAGASSERT(src != NULL); |
| 510 |
_DIAGASSERT(dst != NULL); |
| 511 |
#define CHECKSPACE() \ |
| 512 |
do { \ |
| 513 |
if (dlen-- == 0) { \ |
| 514 |
errno = ENOSPC; \ |
| 515 |
return -1; \ |
| 516 |
} \ |
| 517 |
} while (/*CONSTCOND*/0) |
| 518 |
|
| 519 |
while ((c = *src++) != '\0') { |
| 520 |
again: |
| 521 |
switch (unvis(&t, c, &state, flag)) { |
| 522 |
case UNVIS_VALID: |
| 523 |
CHECKSPACE(); |
| 524 |
*dst++ = t; |
| 525 |
break; |
| 526 |
case UNVIS_VALIDPUSH: |
| 527 |
CHECKSPACE(); |
| 528 |
*dst++ = t; |
| 529 |
goto again; |
| 530 |
case 0: |
| 531 |
case UNVIS_NOCHAR: |
| 532 |
break; |
| 533 |
case UNVIS_SYNBAD: |
| 534 |
errno = EINVAL; |
| 535 |
return -1; |
| 536 |
default: |
| 537 |
_DIAGASSERT(/*CONSTCOND*/0); |
| 538 |
errno = EINVAL; |
| 539 |
return -1; |
| 540 |
} |
| 541 |
} |
| 542 |
if (unvis(&t, c, &state, UNVIS_END) == UNVIS_VALID) { |
| 543 |
CHECKSPACE(); |
| 544 |
*dst++ = t; |
| 545 |
} |
| 546 |
CHECKSPACE(); |
| 547 |
*dst = '\0'; |
| 548 |
return (int)(dst - start); |
| 549 |
} |
| 550 |
|
| 551 |
int |
| 552 |
strunvisx(char *dst, const char *src, int flag) |
| 553 |
{ |
| 554 |
return strnunvisx(dst, (size_t)~0, src, flag); |
| 555 |
} |
| 556 |
|
| 557 |
int |
| 558 |
strunvis(char *dst, const char *src) |
| 559 |
{ |
| 560 |
return strnunvisx(dst, (size_t)~0, src, 0); |
| 561 |
} |
| 562 |
|
| 563 |
int |
| 564 |
strnunvis(char *dst, size_t dlen, const char *src) |
| 565 |
{ |
| 566 |
return strnunvisx(dst, dlen, src, 0); |
| 567 |
} |
| 568 |
#endif |
