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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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8dfeba04eb
This adds stravis() and some new encoding flags VIS_SHELL, VIS_META, and VIS_NOLOCALE. Assorted cleanups and fixes includeing a manpage typo[0]. PR: 210013 [0] Submitted by: pi [0]
569 lines
15 KiB
C
569 lines
15 KiB
C
/* $NetBSD: unvis.c,v 1.44 2014/09/26 15:43:36 roy Exp $ */
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/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: unvis.c,v 1.44 2014/09/26 15:43:36 roy Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <ctype.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <errno.h>
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#include <vis.h>
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#define _DIAGASSERT(x) assert(x)
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/*
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* Return the number of elements in a statically-allocated array,
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* __x.
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*/
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#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
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#ifdef __weak_alias
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__weak_alias(strnunvisx,_strnunvisx)
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#endif
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#if !HAVE_VIS
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/*
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* decode driven by state machine
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*/
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#define S_GROUND 0 /* haven't seen escape char */
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#define S_START 1 /* start decoding special sequence */
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#define S_META 2 /* metachar started (M) */
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#define S_META1 3 /* metachar more, regular char (-) */
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#define S_CTRL 4 /* control char started (^) */
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#define S_OCTAL2 5 /* octal digit 2 */
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#define S_OCTAL3 6 /* octal digit 3 */
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#define S_HEX 7 /* mandatory hex digit */
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#define S_HEX1 8 /* http hex digit */
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#define S_HEX2 9 /* http hex digit 2 */
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#define S_MIME1 10 /* mime hex digit 1 */
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#define S_MIME2 11 /* mime hex digit 2 */
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#define S_EATCRNL 12 /* mime eating CRNL */
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#define S_AMP 13 /* seen & */
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#define S_NUMBER 14 /* collecting number */
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#define S_STRING 15 /* collecting string */
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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#define xtod(c) (isdigit(c) ? (c - '0') : ((tolower(c) - 'a') + 10))
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#define XTOD(c) (isdigit(c) ? (c - '0') : ((c - 'A') + 10))
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/*
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* RFC 1866
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*/
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static const struct nv {
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char name[7];
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uint8_t value;
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} nv[] = {
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{ "AElig", 198 }, /* capital AE diphthong (ligature) */
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{ "Aacute", 193 }, /* capital A, acute accent */
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{ "Acirc", 194 }, /* capital A, circumflex accent */
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{ "Agrave", 192 }, /* capital A, grave accent */
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{ "Aring", 197 }, /* capital A, ring */
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{ "Atilde", 195 }, /* capital A, tilde */
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{ "Auml", 196 }, /* capital A, dieresis or umlaut mark */
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{ "Ccedil", 199 }, /* capital C, cedilla */
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{ "ETH", 208 }, /* capital Eth, Icelandic */
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{ "Eacute", 201 }, /* capital E, acute accent */
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{ "Ecirc", 202 }, /* capital E, circumflex accent */
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{ "Egrave", 200 }, /* capital E, grave accent */
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{ "Euml", 203 }, /* capital E, dieresis or umlaut mark */
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{ "Iacute", 205 }, /* capital I, acute accent */
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{ "Icirc", 206 }, /* capital I, circumflex accent */
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{ "Igrave", 204 }, /* capital I, grave accent */
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{ "Iuml", 207 }, /* capital I, dieresis or umlaut mark */
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{ "Ntilde", 209 }, /* capital N, tilde */
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{ "Oacute", 211 }, /* capital O, acute accent */
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{ "Ocirc", 212 }, /* capital O, circumflex accent */
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{ "Ograve", 210 }, /* capital O, grave accent */
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{ "Oslash", 216 }, /* capital O, slash */
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{ "Otilde", 213 }, /* capital O, tilde */
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{ "Ouml", 214 }, /* capital O, dieresis or umlaut mark */
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{ "THORN", 222 }, /* capital THORN, Icelandic */
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{ "Uacute", 218 }, /* capital U, acute accent */
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{ "Ucirc", 219 }, /* capital U, circumflex accent */
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{ "Ugrave", 217 }, /* capital U, grave accent */
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{ "Uuml", 220 }, /* capital U, dieresis or umlaut mark */
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{ "Yacute", 221 }, /* capital Y, acute accent */
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{ "aacute", 225 }, /* small a, acute accent */
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{ "acirc", 226 }, /* small a, circumflex accent */
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{ "acute", 180 }, /* acute accent */
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{ "aelig", 230 }, /* small ae diphthong (ligature) */
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{ "agrave", 224 }, /* small a, grave accent */
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{ "amp", 38 }, /* ampersand */
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{ "aring", 229 }, /* small a, ring */
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{ "atilde", 227 }, /* small a, tilde */
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{ "auml", 228 }, /* small a, dieresis or umlaut mark */
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{ "brvbar", 166 }, /* broken (vertical) bar */
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{ "ccedil", 231 }, /* small c, cedilla */
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{ "cedil", 184 }, /* cedilla */
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{ "cent", 162 }, /* cent sign */
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{ "copy", 169 }, /* copyright sign */
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{ "curren", 164 }, /* general currency sign */
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{ "deg", 176 }, /* degree sign */
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{ "divide", 247 }, /* divide sign */
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{ "eacute", 233 }, /* small e, acute accent */
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{ "ecirc", 234 }, /* small e, circumflex accent */
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{ "egrave", 232 }, /* small e, grave accent */
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{ "eth", 240 }, /* small eth, Icelandic */
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{ "euml", 235 }, /* small e, dieresis or umlaut mark */
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{ "frac12", 189 }, /* fraction one-half */
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{ "frac14", 188 }, /* fraction one-quarter */
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{ "frac34", 190 }, /* fraction three-quarters */
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{ "gt", 62 }, /* greater than */
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{ "iacute", 237 }, /* small i, acute accent */
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{ "icirc", 238 }, /* small i, circumflex accent */
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{ "iexcl", 161 }, /* inverted exclamation mark */
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{ "igrave", 236 }, /* small i, grave accent */
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{ "iquest", 191 }, /* inverted question mark */
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{ "iuml", 239 }, /* small i, dieresis or umlaut mark */
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{ "laquo", 171 }, /* angle quotation mark, left */
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{ "lt", 60 }, /* less than */
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{ "macr", 175 }, /* macron */
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{ "micro", 181 }, /* micro sign */
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{ "middot", 183 }, /* middle dot */
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{ "nbsp", 160 }, /* no-break space */
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{ "not", 172 }, /* not sign */
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{ "ntilde", 241 }, /* small n, tilde */
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{ "oacute", 243 }, /* small o, acute accent */
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{ "ocirc", 244 }, /* small o, circumflex accent */
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{ "ograve", 242 }, /* small o, grave accent */
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{ "ordf", 170 }, /* ordinal indicator, feminine */
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{ "ordm", 186 }, /* ordinal indicator, masculine */
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{ "oslash", 248 }, /* small o, slash */
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{ "otilde", 245 }, /* small o, tilde */
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{ "ouml", 246 }, /* small o, dieresis or umlaut mark */
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{ "para", 182 }, /* pilcrow (paragraph sign) */
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{ "plusmn", 177 }, /* plus-or-minus sign */
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{ "pound", 163 }, /* pound sterling sign */
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{ "quot", 34 }, /* double quote */
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{ "raquo", 187 }, /* angle quotation mark, right */
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{ "reg", 174 }, /* registered sign */
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{ "sect", 167 }, /* section sign */
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{ "shy", 173 }, /* soft hyphen */
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{ "sup1", 185 }, /* superscript one */
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{ "sup2", 178 }, /* superscript two */
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{ "sup3", 179 }, /* superscript three */
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{ "szlig", 223 }, /* small sharp s, German (sz ligature) */
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{ "thorn", 254 }, /* small thorn, Icelandic */
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{ "times", 215 }, /* multiply sign */
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{ "uacute", 250 }, /* small u, acute accent */
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{ "ucirc", 251 }, /* small u, circumflex accent */
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{ "ugrave", 249 }, /* small u, grave accent */
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{ "uml", 168 }, /* umlaut (dieresis) */
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{ "uuml", 252 }, /* small u, dieresis or umlaut mark */
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{ "yacute", 253 }, /* small y, acute accent */
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{ "yen", 165 }, /* yen sign */
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{ "yuml", 255 }, /* small y, dieresis or umlaut mark */
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};
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/*
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* unvis - decode characters previously encoded by vis
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*/
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int
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unvis(char *cp, int c, int *astate, int flag)
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{
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unsigned char uc = (unsigned char)c;
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unsigned char st, ia, is, lc;
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/*
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* Bottom 8 bits of astate hold the state machine state.
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* Top 8 bits hold the current character in the http 1866 nv string decoding
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*/
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#define GS(a) ((a) & 0xff)
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#define SS(a, b) (((uint32_t)(a) << 24) | (b))
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#define GI(a) ((uint32_t)(a) >> 24)
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_DIAGASSERT(cp != NULL);
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_DIAGASSERT(astate != NULL);
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st = GS(*astate);
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if (flag & UNVIS_END) {
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switch (st) {
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case S_OCTAL2:
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case S_OCTAL3:
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case S_HEX2:
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case S_GROUND:
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return UNVIS_NOCHAR;
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default:
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return UNVIS_SYNBAD;
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}
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}
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switch (st) {
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case S_GROUND:
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*cp = 0;
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if ((flag & VIS_NOESCAPE) == 0 && c == '\\') {
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*astate = SS(0, S_START);
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return UNVIS_NOCHAR;
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}
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if ((flag & VIS_HTTP1808) && c == '%') {
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*astate = SS(0, S_HEX1);
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return UNVIS_NOCHAR;
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}
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if ((flag & VIS_HTTP1866) && c == '&') {
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*astate = SS(0, S_AMP);
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return UNVIS_NOCHAR;
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}
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if ((flag & VIS_MIMESTYLE) && c == '=') {
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*astate = SS(0, S_MIME1);
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return UNVIS_NOCHAR;
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}
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*cp = c;
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return UNVIS_VALID;
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case S_START:
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switch(c) {
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case '\\':
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*cp = c;
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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*cp = (c - '0');
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*astate = SS(0, S_OCTAL2);
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return UNVIS_NOCHAR;
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case 'M':
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*cp = (char)0200;
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*astate = SS(0, S_META);
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return UNVIS_NOCHAR;
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case '^':
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*astate = SS(0, S_CTRL);
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return UNVIS_NOCHAR;
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case 'n':
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*cp = '\n';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'r':
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*cp = '\r';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'b':
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*cp = '\b';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'a':
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*cp = '\007';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'v':
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*cp = '\v';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 't':
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*cp = '\t';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'f':
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*cp = '\f';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 's':
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*cp = ' ';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'E':
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*cp = '\033';
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case 'x':
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*astate = SS(0, S_HEX);
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return UNVIS_NOCHAR;
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case '\n':
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/*
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* hidden newline
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*/
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*astate = SS(0, S_GROUND);
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return UNVIS_NOCHAR;
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case '$':
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/*
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* hidden marker
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*/
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*astate = SS(0, S_GROUND);
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return UNVIS_NOCHAR;
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default:
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if (isgraph(c)) {
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*cp = c;
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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}
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}
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goto bad;
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case S_META:
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if (c == '-')
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*astate = SS(0, S_META1);
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else if (c == '^')
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*astate = SS(0, S_CTRL);
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else
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goto bad;
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return UNVIS_NOCHAR;
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case S_META1:
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*astate = SS(0, S_GROUND);
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*cp |= c;
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return UNVIS_VALID;
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case S_CTRL:
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if (c == '?')
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*cp |= 0177;
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else
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*cp |= c & 037;
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*astate = SS(0, S_GROUND);
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return UNVIS_VALID;
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case S_OCTAL2: /* second possible octal digit */
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if (isoctal(uc)) {
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/*
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* yes - and maybe a third
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*/
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*cp = (*cp << 3) + (c - '0');
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*astate = SS(0, S_OCTAL3);
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return UNVIS_NOCHAR;
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}
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/*
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* no - done with current sequence, push back passed char
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*/
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*astate = SS(0, S_GROUND);
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return UNVIS_VALIDPUSH;
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case S_OCTAL3: /* third possible octal digit */
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*astate = SS(0, S_GROUND);
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if (isoctal(uc)) {
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*cp = (*cp << 3) + (c - '0');
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return UNVIS_VALID;
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}
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/*
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* we were done, push back passed char
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*/
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return UNVIS_VALIDPUSH;
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case S_HEX:
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if (!isxdigit(uc))
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goto bad;
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/*FALLTHROUGH*/
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case S_HEX1:
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if (isxdigit(uc)) {
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*cp = xtod(uc);
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*astate = SS(0, S_HEX2);
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return UNVIS_NOCHAR;
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}
|
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/*
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* no - done with current sequence, push back passed char
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*/
|
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*astate = SS(0, S_GROUND);
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return UNVIS_VALIDPUSH;
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|
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case S_HEX2:
|
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*astate = S_GROUND;
|
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if (isxdigit(uc)) {
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*cp = xtod(uc) | (*cp << 4);
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return UNVIS_VALID;
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}
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return UNVIS_VALIDPUSH;
|
|
|
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case S_MIME1:
|
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if (uc == '\n' || uc == '\r') {
|
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*astate = SS(0, S_EATCRNL);
|
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return UNVIS_NOCHAR;
|
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}
|
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if (isxdigit(uc) && (isdigit(uc) || isupper(uc))) {
|
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*cp = XTOD(uc);
|
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*astate = SS(0, S_MIME2);
|
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return UNVIS_NOCHAR;
|
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}
|
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goto bad;
|
|
|
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case S_MIME2:
|
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if (isxdigit(uc) && (isdigit(uc) || isupper(uc))) {
|
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*astate = SS(0, S_GROUND);
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*cp = XTOD(uc) | (*cp << 4);
|
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return UNVIS_VALID;
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}
|
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goto bad;
|
|
|
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case S_EATCRNL:
|
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switch (uc) {
|
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case '\r':
|
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case '\n':
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return UNVIS_NOCHAR;
|
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case '=':
|
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*astate = SS(0, S_MIME1);
|
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return UNVIS_NOCHAR;
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default:
|
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*cp = uc;
|
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*astate = SS(0, S_GROUND);
|
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return UNVIS_VALID;
|
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}
|
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|
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case S_AMP:
|
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*cp = 0;
|
|
if (uc == '#') {
|
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*astate = SS(0, S_NUMBER);
|
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return UNVIS_NOCHAR;
|
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}
|
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*astate = SS(0, S_STRING);
|
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/*FALLTHROUGH*/
|
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|
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case S_STRING:
|
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ia = *cp; /* index in the array */
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is = GI(*astate); /* index in the string */
|
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lc = is == 0 ? 0 : nv[ia].name[is - 1]; /* last character */
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|
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if (uc == ';')
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uc = '\0';
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|
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for (; ia < __arraycount(nv); ia++) {
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if (is != 0 && nv[ia].name[is - 1] != lc)
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goto bad;
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if (nv[ia].name[is] == uc)
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break;
|
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}
|
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|
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if (ia == __arraycount(nv))
|
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goto bad;
|
|
|
|
if (uc != 0) {
|
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*cp = ia;
|
|
*astate = SS(is + 1, S_STRING);
|
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return UNVIS_NOCHAR;
|
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}
|
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|
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*cp = nv[ia].value;
|
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*astate = SS(0, S_GROUND);
|
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return UNVIS_VALID;
|
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|
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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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* strnunvisx - decode src into dst
|
|
*
|
|
* Number of chars decoded into dst is returned, -1 on error.
|
|
* Dst is null terminated.
|
|
*/
|
|
|
|
int
|
|
strnunvisx(char *dst, size_t dlen, const char *src, int flag)
|
|
{
|
|
char c;
|
|
char t = '\0', *start = dst;
|
|
int state = 0;
|
|
|
|
_DIAGASSERT(src != NULL);
|
|
_DIAGASSERT(dst != NULL);
|
|
#define CHECKSPACE() \
|
|
do { \
|
|
if (dlen-- == 0) { \
|
|
errno = ENOSPC; \
|
|
return -1; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
while ((c = *src++) != '\0') {
|
|
again:
|
|
switch (unvis(&t, c, &state, flag)) {
|
|
case UNVIS_VALID:
|
|
CHECKSPACE();
|
|
*dst++ = t;
|
|
break;
|
|
case UNVIS_VALIDPUSH:
|
|
CHECKSPACE();
|
|
*dst++ = t;
|
|
goto again;
|
|
case 0:
|
|
case UNVIS_NOCHAR:
|
|
break;
|
|
case UNVIS_SYNBAD:
|
|
errno = EINVAL;
|
|
return -1;
|
|
default:
|
|
_DIAGASSERT(/*CONSTCOND*/0);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
}
|
|
if (unvis(&t, c, &state, UNVIS_END) == UNVIS_VALID) {
|
|
CHECKSPACE();
|
|
*dst++ = t;
|
|
}
|
|
CHECKSPACE();
|
|
*dst = '\0';
|
|
return (int)(dst - start);
|
|
}
|
|
|
|
int
|
|
strunvisx(char *dst, const char *src, int flag)
|
|
{
|
|
return strnunvisx(dst, (size_t)~0, src, flag);
|
|
}
|
|
|
|
int
|
|
strunvis(char *dst, const char *src)
|
|
{
|
|
return strnunvisx(dst, (size_t)~0, src, 0);
|
|
}
|
|
|
|
int
|
|
strnunvis(char *dst, size_t dlen, const char *src)
|
|
{
|
|
return strnunvisx(dst, dlen, src, 0);
|
|
}
|
|
#endif
|