| 1 | /* $NetBSD: vis.c,v 1.41 2009/11/23 10:08:47 plunky Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1989, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | */
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| 31 |
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| 32 | /*-
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| 33 | * Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
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| 34 | * All rights reserved.
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| 35 | *
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| 36 | * Redistribution and use in source and binary forms, with or without
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| 37 | * modification, are permitted provided that the following conditions
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| 38 | * are met:
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| 39 | * 1. Redistributions of source code must retain the above copyright
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| 40 | * notice, this list of conditions and the following disclaimer.
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| 41 | * 2. Redistributions in binary form must reproduce the above copyright
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| 42 | * notice, this list of conditions and the following disclaimer in the
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| 43 | * documentation and/or other materials provided with the distribution.
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| 44 | *
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| 45 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 46 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 47 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 48 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 49 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 50 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 51 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 52 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 53 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 54 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 55 | * POSSIBILITY OF SUCH DAMAGE.
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| 56 | */
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| 57 |
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| 58 | #include "config.h"
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| 59 |
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| 60 | #if defined(LIBC_SCCS) && !defined(lint)
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| 61 | __RCSID("$NetBSD: vis.c,v 1.41 2009/11/23 10:08:47 plunky Exp $");
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| 62 | #endif /* LIBC_SCCS and not lint */
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| 63 |
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| 64 | #include <sys/types.h>
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| 65 |
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| 66 | #include <assert.h>
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| 67 | #include <vis.h>
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| 68 | #include <stdlib.h>
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| 69 |
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| 70 | #ifdef __weak_alias
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| 71 | __weak_alias(strsvis,_strsvis)
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| 72 | __weak_alias(strsvisx,_strsvisx)
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| 73 | __weak_alias(strvis,_strvis)
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| 74 | __weak_alias(strvisx,_strvisx)
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| 75 | __weak_alias(svis,_svis)
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| 76 | __weak_alias(vis,_vis)
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| 77 | #endif
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| 78 |
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| 79 | #if !HAVE_VIS || !HAVE_SVIS
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| 80 | #include <ctype.h>
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| 81 | #include <limits.h>
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| 82 | #include <stdio.h>
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| 83 | #include <string.h>
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| 84 |
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| 85 | static char *do_svis(char *, int, int, int, const char *);
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| 86 |
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| 87 | #undef BELL
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| 88 | #define BELL '\a'
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| 89 |
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| 90 | #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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| 91 | #define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
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| 92 | #define issafe(c) (c == '\b' || c == BELL || c == '\r')
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| 93 | #define xtoa(c) "0123456789abcdef"[c]
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| 94 | #define XTOA(c) "0123456789ABCDEF"[c]
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| 95 |
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| 96 | #define MAXEXTRAS 5
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| 97 |
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| 98 | #define MAKEEXTRALIST(flag, extra, orig_str) \
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| 99 | do { \
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| 100 | const char *orig = orig_str; \
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| 101 | const char *o = orig; \
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| 102 | char *e; \
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| 103 | while (*o++) \
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| 104 | continue; \
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| 105 | extra = malloc((size_t)((o - orig) + MAXEXTRAS)); \
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| 106 | if (!extra) break; \
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| 107 | for (o = orig, e = extra; (*e++ = *o++) != '\0';) \
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| 108 | continue; \
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| 109 | e--; \
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| 110 | if (flag & VIS_SP) *e++ = ' '; \
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| 111 | if (flag & VIS_TAB) *e++ = '\t'; \
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| 112 | if (flag & VIS_NL) *e++ = '\n'; \
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| 113 | if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \
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| 114 | *e = '\0'; \
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| 115 | } while (/*CONSTCOND*/0)
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| 116 |
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| 117 | /*
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| 118 | * This is do_hvis, for HTTP style (RFC 1808)
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| 119 | */
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| 120 | static char *
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| 121 | do_hvis(char *dst, int c, int flag, int nextc, const char *extra)
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| 122 | {
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| 123 |
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| 124 | if ((isascii(c) && isalnum(c))
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| 125 | /* safe */
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| 126 | || c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
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| 127 | /* extra */
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| 128 | || c == '!' || c == '*' || c == '\'' || c == '(' || c == ')'
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| 129 | || c == ',') {
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| 130 | dst = do_svis(dst, c, flag, nextc, extra);
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| 131 | } else {
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| 132 | *dst++ = '%';
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| 133 | *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
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| 134 | *dst++ = xtoa((unsigned int)c & 0xf);
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| 135 | }
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| 136 |
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| 137 | return dst;
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| 138 | }
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| 139 |
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| 140 | /*
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| 141 | * This is do_mvis, for Quoted-Printable MIME (RFC 2045)
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| 142 | * NB: No handling of long lines or CRLF.
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| 143 | */
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| 144 | static char *
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| 145 | do_mvis(char *dst, int c, int flag, int nextc, const char *extra)
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| 146 | {
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| 147 | if ((c != '\n') &&
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| 148 | /* Space at the end of the line */
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| 149 | ((isspace(c) && (nextc == '\r' || nextc == '\n')) ||
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| 150 | /* Out of range */
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| 151 | (!isspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
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| 152 | /* Specific char to be escaped */
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| 153 | strchr("#$@[\\]^`{|}~", c) != NULL)) {
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| 154 | *dst++ = '=';
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| 155 | *dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
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| 156 | *dst++ = XTOA((unsigned int)c & 0xf);
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| 157 | } else {
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| 158 | dst = do_svis(dst, c, flag, nextc, extra);
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| 159 | }
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| 160 | return dst;
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| 161 | }
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| 162 |
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| 163 | /*
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| 164 | * This is do_vis, the central code of vis.
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| 165 | * dst: Pointer to the destination buffer
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| 166 | * c: Character to encode
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| 167 | * flag: Flag word
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| 168 | * nextc: The character following 'c'
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| 169 | * extra: Pointer to the list of extra characters to be
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| 170 | * backslash-protected.
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| 171 | */
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| 172 | static char *
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| 173 | do_svis(char *dst, int c, int flag, int nextc, const char *extra)
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| 174 | {
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| 175 | int isextra;
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| 176 | isextra = strchr(extra, c) != NULL;
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| 177 | if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) ||
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| 178 | ((flag & VIS_SAFE) && issafe(c)))) {
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| 179 | *dst++ = c;
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| 180 | return dst;
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| 181 | }
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| 182 | if (flag & VIS_CSTYLE) {
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| 183 | switch (c) {
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| 184 | case '\n':
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| 185 | *dst++ = '\\'; *dst++ = 'n';
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| 186 | return dst;
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| 187 | case '\r':
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| 188 | *dst++ = '\\'; *dst++ = 'r';
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| 189 | return dst;
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| 190 | case '\b':
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| 191 | *dst++ = '\\'; *dst++ = 'b';
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| 192 | return dst;
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| 193 | case BELL:
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| 194 | *dst++ = '\\'; *dst++ = 'a';
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| 195 | return dst;
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| 196 | case '\v':
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| 197 | *dst++ = '\\'; *dst++ = 'v';
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| 198 | return dst;
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| 199 | case '\t':
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| 200 | *dst++ = '\\'; *dst++ = 't';
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| 201 | return dst;
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| 202 | case '\f':
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| 203 | *dst++ = '\\'; *dst++ = 'f';
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| 204 | return dst;
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| 205 | case ' ':
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| 206 | *dst++ = '\\'; *dst++ = 's';
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| 207 | return dst;
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| 208 | case '\0':
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| 209 | *dst++ = '\\'; *dst++ = '0';
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| 210 | if (isoctal(nextc)) {
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| 211 | *dst++ = '0';
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| 212 | *dst++ = '0';
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| 213 | }
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| 214 | return dst;
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| 215 | default:
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| 216 | if (isgraph(c)) {
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| 217 | *dst++ = '\\'; *dst++ = c;
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| 218 | return dst;
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| 219 | }
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| 220 | }
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| 221 | }
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| 222 | if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
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| 223 | *dst++ = '\\';
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| 224 | *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0';
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| 225 | *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0';
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| 226 | *dst++ = (c & 07) + '0';
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| 227 | } else {
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| 228 | if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\';
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| 229 | if (c & 0200) {
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| 230 | c &= 0177; *dst++ = 'M';
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| 231 | }
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| 232 | if (iscntrl(c)) {
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| 233 | *dst++ = '^';
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| 234 | if (c == 0177)
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| 235 | *dst++ = '?';
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| 236 | else
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| 237 | *dst++ = c + '@';
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| 238 | } else {
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| 239 | *dst++ = '-'; *dst++ = c;
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| 240 | }
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| 241 | }
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| 242 | return dst;
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| 243 | }
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| 244 |
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| 245 | typedef char *(*visfun_t)(char *, int, int, int, const char *);
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| 246 |
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| 247 | /*
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| 248 | * Return the appropriate encoding function depending on the flags given.
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| 249 | */
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| 250 | static visfun_t
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| 251 | getvisfun(int flag)
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| 252 | {
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| 253 | if (flag & VIS_HTTPSTYLE)
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| 254 | return do_hvis;
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| 255 | if (flag & VIS_MIMESTYLE)
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| 256 | return do_mvis;
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| 257 | return do_svis;
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| 258 | }
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| 259 |
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| 260 | /*
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| 261 | * svis - visually encode characters, also encoding the characters
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| 262 | * pointed to by `extra'
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| 263 | */
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| 264 | char *
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| 265 | svis(char *dst, int c, int flag, int nextc, const char *extra)
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| 266 | {
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| 267 | char *nextra = NULL;
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| 268 | visfun_t f;
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| 269 |
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| 270 | _DIAGASSERT(dst != NULL);
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| 271 | _DIAGASSERT(extra != NULL);
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| 272 | MAKEEXTRALIST(flag, nextra, extra);
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| 273 | if (!nextra) {
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| 274 | *dst = '\0'; /* can't create nextra, return "" */
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| 275 | return dst;
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| 276 | }
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| 277 | f = getvisfun(flag);
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| 278 | dst = (*f)(dst, c, flag, nextc, nextra);
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| 279 | free(nextra);
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| 280 | *dst = '\0';
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| 281 | return dst;
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| 282 | }
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| 283 |
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| 284 |
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| 285 | /*
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| 286 | * strsvis, strsvisx - visually encode characters from src into dst
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| 287 | *
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| 288 | * Extra is a pointer to a \0-terminated list of characters to
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| 289 | * be encoded, too. These functions are useful e. g. to
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| 290 | * encode strings in such a way so that they are not interpreted
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| 291 | * by a shell.
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| 292 | *
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| 293 | * Dst must be 4 times the size of src to account for possible
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| 294 | * expansion. The length of dst, not including the trailing NULL,
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| 295 | * is returned.
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| 296 | *
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| 297 | * Strsvisx encodes exactly len bytes from src into dst.
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| 298 | * This is useful for encoding a block of data.
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| 299 | */
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| 300 | int
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| 301 | strsvis(char *dst, const char *csrc, int flag, const char *extra)
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| 302 | {
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| 303 | int c;
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| 304 | char *start;
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| 305 | char *nextra = NULL;
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| 306 | const unsigned char *src = (const unsigned char *)csrc;
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| 307 | visfun_t f;
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| 308 |
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| 309 | _DIAGASSERT(dst != NULL);
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| 310 | _DIAGASSERT(src != NULL);
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| 311 | _DIAGASSERT(extra != NULL);
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| 312 | MAKEEXTRALIST(flag, nextra, extra);
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| 313 | if (!nextra) {
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| 314 | *dst = '\0'; /* can't create nextra, return "" */
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| 315 | return 0;
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| 316 | }
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| 317 | f = getvisfun(flag);
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| 318 | for (start = dst; (c = *src++) != '\0'; /* empty */)
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| 319 | dst = (*f)(dst, c, flag, *src, nextra);
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| 320 | free(nextra);
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| 321 | *dst = '\0';
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| 322 | return (int)(dst - start);
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| 323 | }
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| 324 |
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| 325 |
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| 326 | int
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| 327 | strsvisx(char *dst, const char *csrc, size_t len, int flag, const char *extra)
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| 328 | {
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| 329 | unsigned char c;
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| 330 | char *start;
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| 331 | char *nextra = NULL;
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| 332 | const unsigned char *src = (const unsigned char *)csrc;
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| 333 | visfun_t f;
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| 334 |
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| 335 | _DIAGASSERT(dst != NULL);
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| 336 | _DIAGASSERT(src != NULL);
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| 337 | _DIAGASSERT(extra != NULL);
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| 338 | MAKEEXTRALIST(flag, nextra, extra);
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| 339 | if (! nextra) {
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| 340 | *dst = '\0'; /* can't create nextra, return "" */
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| 341 | return 0;
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| 342 | }
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| 343 |
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| 344 | f = getvisfun(flag);
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| 345 | for (start = dst; len > 0; len--) {
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| 346 | c = *src++;
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| 347 | dst = (*f)(dst, c, flag, len > 1 ? *src : '\0', nextra);
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| 348 | }
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| 349 | free(nextra);
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| 350 | *dst = '\0';
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| 351 | return (int)(dst - start);
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| 352 | }
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| 353 | #endif
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| 354 |
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| 355 | #if !HAVE_VIS
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| 356 | /*
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| 357 | * vis - visually encode characters
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| 358 | */
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| 359 | char *
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| 360 | vis(char *dst, int c, int flag, int nextc)
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| 361 | {
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| 362 | char *extra = NULL;
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| 363 | unsigned char uc = (unsigned char)c;
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| 364 | visfun_t f;
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| 365 |
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| 366 | _DIAGASSERT(dst != NULL);
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| 367 |
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| 368 | MAKEEXTRALIST(flag, extra, "");
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| 369 | if (! extra) {
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| 370 | *dst = '\0'; /* can't create extra, return "" */
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| 371 | return dst;
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| 372 | }
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| 373 | f = getvisfun(flag);
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| 374 | dst = (*f)(dst, uc, flag, nextc, extra);
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| 375 | free(extra);
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| 376 | *dst = '\0';
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| 377 | return dst;
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| 378 | }
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| 379 |
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| 380 |
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| 381 | /*
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| 382 | * strvis, strvisx - visually encode characters from src into dst
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| 383 | *
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| 384 | * Dst must be 4 times the size of src to account for possible
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| 385 | * expansion. The length of dst, not including the trailing NULL,
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| 386 | * is returned.
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| 387 | *
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| 388 | * Strvisx encodes exactly len bytes from src into dst.
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| 389 | * This is useful for encoding a block of data.
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| 390 | */
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| 391 | int
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| 392 | strvis(char *dst, const char *src, int flag)
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| 393 | {
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| 394 | char *extra = NULL;
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| 395 | int rv;
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| 396 |
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| 397 | MAKEEXTRALIST(flag, extra, "");
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| 398 | if (!extra) {
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| 399 | *dst = '\0'; /* can't create extra, return "" */
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| 400 | return 0;
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| 401 | }
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| 402 | rv = strsvis(dst, src, flag, extra);
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| 403 | free(extra);
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| 404 | return rv;
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| 405 | }
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| 406 |
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| 407 |
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| 408 | int
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| 409 | strvisx(char *dst, const char *src, size_t len, int flag)
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| 410 | {
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| 411 | char *extra = NULL;
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| 412 | int rv;
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| 413 |
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| 414 | MAKEEXTRALIST(flag, extra, "");
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| 415 | if (!extra) {
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| 416 | *dst = '\0'; /* can't create extra, return "" */
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| 417 | return 0;
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| 418 | }
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| 419 | rv = strsvisx(dst, src, len, flag, extra);
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| 420 | free(extra);
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| 421 | return rv;
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| 422 | }
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| 423 | #endif
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