| 1 | /* $NetBSD: vis.c,v 1.37 2008/07/25 22:29:23 dsl 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 | #if 1
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| 59 | #include <config.h>
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| 60 | #include "roken.h"
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| 61 | #ifndef _DIAGASSERT
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| 62 | #define _DIAGASSERT(X)
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| 63 | #endif
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| 64 | #else /* heimdal */
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| 65 | #include <sys/cdefs.h>
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| 66 | #if defined(LIBC_SCCS) && !defined(lint)
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| 67 | __RCSID("$NetBSD: vis.c,v 1.37 2008/07/25 22:29:23 dsl Exp $");
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| 68 | #endif /* LIBC_SCCS and not lint */
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| 69 |
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| 70 | #include "namespace.h"
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| 71 | #endif /* heimdal */
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| 72 |
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| 73 | #include <sys/types.h>
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| 74 |
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| 75 | #include <assert.h>
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| 76 | #include <ctype.h>
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| 77 | #include <limits.h>
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| 78 | #include <stdio.h>
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| 79 | #include <string.h>
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| 80 | #include <vis.h>
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| 81 | #include <stdlib.h>
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| 82 |
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| 83 | #if 0
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| 84 | #ifdef __weak_alias
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| 85 | __weak_alias(strsvis,_strsvis)
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| 86 | __weak_alias(strsvisx,_strsvisx)
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| 87 | __weak_alias(strvis,_strvis)
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| 88 | __weak_alias(strvisx,_strvisx)
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| 89 | __weak_alias(svis,_svis)
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| 90 | __weak_alias(vis,_vis)
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| 91 | #endif
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| 92 | #endif
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| 93 |
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| 94 | #if !HAVE_VIS || !HAVE_SVIS
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| 95 | #include <ctype.h>
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| 96 | #include <limits.h>
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| 97 | #include <stdio.h>
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| 98 | #include <string.h>
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| 99 |
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| 100 | static char *do_svis(char *, int, int, int, const char *);
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| 101 |
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| 102 | #undef BELL
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| 103 | #if defined(__STDC__)
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| 104 | #define BELL '\a'
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| 105 | #else
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| 106 | #define BELL '\007'
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| 107 | #endif
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| 108 |
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| 109 | char * ROKEN_LIB_FUNCTION
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| 110 | rk_vis (char *, int, int, int);
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| 111 | char * ROKEN_LIB_FUNCTION
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| 112 | rk_svis (char *, int, int, int, const char *);
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| 113 | int ROKEN_LIB_FUNCTION
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| 114 | rk_strvis (char *, const char *, int);
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| 115 | int ROKEN_LIB_FUNCTION
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| 116 | rk_strsvis (char *, const char *, int, const char *);
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| 117 | int ROKEN_LIB_FUNCTION
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| 118 | rk_strvisx (char *, const char *, size_t, int);
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| 119 | int ROKEN_LIB_FUNCTION
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| 120 | rk_strsvisx (char *, const char *, size_t, int, const char *);
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| 121 |
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| 122 |
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| 123 | #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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| 124 | #define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
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| 125 | #define issafe(c) (c == '\b' || c == BELL || c == '\r')
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| 126 | #define xtoa(c) "0123456789abcdef"[c]
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| 127 |
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| 128 | #define MAXEXTRAS 5
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| 129 |
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| 130 | #define MAKEEXTRALIST(flag, extra, orig_str) \
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| 131 | do { \
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| 132 | const char *orig = orig_str; \
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| 133 | const char *o = orig; \
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| 134 | char *e; \
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| 135 | while (*o++) \
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| 136 | continue; \
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| 137 | extra = malloc((size_t)((o - orig) + MAXEXTRAS)); \
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| 138 | if (!extra) break; \
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| 139 | for (o = orig, e = extra; (*e++ = *o++) != '\0';) \
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| 140 | continue; \
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| 141 | e--; \
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| 142 | if (flag & VIS_SP) *e++ = ' '; \
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| 143 | if (flag & VIS_TAB) *e++ = '\t'; \
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| 144 | if (flag & VIS_NL) *e++ = '\n'; \
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| 145 | if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \
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| 146 | *e = '\0'; \
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| 147 | } while (/*CONSTCOND*/0)
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| 148 |
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| 149 | /*
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| 150 | * This is do_hvis, for HTTP style (RFC 1808)
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| 151 | */
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| 152 | static char *
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| 153 | do_hvis(char *dst, int c, int flag, int nextc, const char *extra)
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| 154 | {
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| 155 | if (!isascii(c) || !isalnum(c) || strchr("$-_.+!*'(),", c) != NULL) {
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| 156 | *dst++ = '%';
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| 157 | *dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
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| 158 | *dst++ = xtoa((unsigned int)c & 0xf);
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| 159 | } else {
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| 160 | dst = do_svis(dst, c, flag, nextc, extra);
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| 161 | }
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| 162 | return dst;
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| 163 | }
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| 164 |
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| 165 | /*
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| 166 | * This is do_vis, the central code of vis.
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| 167 | * dst: Pointer to the destination buffer
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| 168 | * c: Character to encode
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| 169 | * flag: Flag word
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| 170 | * nextc: The character following 'c'
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| 171 | * extra: Pointer to the list of extra characters to be
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| 172 | * backslash-protected.
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| 173 | */
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| 174 | static char *
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| 175 | do_svis(char *dst, int c, int flag, int nextc, const char *extra)
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| 176 | {
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| 177 | int isextra;
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| 178 | isextra = strchr(extra, c) != NULL;
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| 179 | if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) ||
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| 180 | ((flag & VIS_SAFE) && issafe(c)))) {
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| 181 | *dst++ = c;
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| 182 | return dst;
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| 183 | }
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| 184 | if (flag & VIS_CSTYLE) {
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| 185 | switch (c) {
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| 186 | case '\n':
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| 187 | *dst++ = '\\'; *dst++ = 'n';
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| 188 | return dst;
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| 189 | case '\r':
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| 190 | *dst++ = '\\'; *dst++ = 'r';
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| 191 | return dst;
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| 192 | case '\b':
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| 193 | *dst++ = '\\'; *dst++ = 'b';
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| 194 | return dst;
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| 195 | case BELL:
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| 196 | *dst++ = '\\'; *dst++ = 'a';
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| 197 | return dst;
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| 198 | case '\v':
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| 199 | *dst++ = '\\'; *dst++ = 'v';
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| 200 | return dst;
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| 201 | case '\t':
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| 202 | *dst++ = '\\'; *dst++ = 't';
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| 203 | return dst;
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| 204 | case '\f':
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| 205 | *dst++ = '\\'; *dst++ = 'f';
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| 206 | return dst;
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| 207 | case ' ':
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| 208 | *dst++ = '\\'; *dst++ = 's';
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| 209 | return dst;
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| 210 | case '\0':
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| 211 | *dst++ = '\\'; *dst++ = '0';
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| 212 | if (isoctal(nextc)) {
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| 213 | *dst++ = '0';
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| 214 | *dst++ = '0';
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| 215 | }
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| 216 | return dst;
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| 217 | default:
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| 218 | if (isgraph(c)) {
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| 219 | *dst++ = '\\'; *dst++ = c;
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| 220 | return dst;
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| 221 | }
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| 222 | }
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| 223 | }
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| 224 | if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
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| 225 | *dst++ = '\\';
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| 226 | *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0';
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| 227 | *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0';
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| 228 | *dst++ = (c & 07) + '0';
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| 229 | } else {
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| 230 | if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\';
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| 231 | if (c & 0200) {
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| 232 | c &= 0177; *dst++ = 'M';
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| 233 | }
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| 234 | if (iscntrl(c)) {
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| 235 | *dst++ = '^';
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| 236 | if (c == 0177)
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| 237 | *dst++ = '?';
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| 238 | else
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| 239 | *dst++ = c + '@';
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| 240 | } else {
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| 241 | *dst++ = '-'; *dst++ = c;
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| 242 | }
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| 243 | }
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| 244 | return dst;
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| 245 | }
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| 246 |
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| 247 |
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| 248 | /*
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| 249 | * svis - visually encode characters, also encoding the characters
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| 250 | * pointed to by `extra'
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| 251 | */
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| 252 | char * ROKEN_LIB_FUNCTION
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| 253 | rk_svis(char *dst, int c, int flag, int nextc, const char *extra)
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| 254 | {
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| 255 | char *nextra = NULL;
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| 256 |
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| 257 | _DIAGASSERT(dst != NULL);
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| 258 | _DIAGASSERT(extra != NULL);
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| 259 | MAKEEXTRALIST(flag, nextra, extra);
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| 260 | if (!nextra) {
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| 261 | *dst = '\0'; /* can't create nextra, return "" */
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| 262 | return dst;
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| 263 | }
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| 264 | if (flag & VIS_HTTPSTYLE)
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| 265 | dst = do_hvis(dst, c, flag, nextc, nextra);
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| 266 | else
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| 267 | dst = do_svis(dst, c, flag, nextc, nextra);
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| 268 | free(nextra);
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| 269 | *dst = '\0';
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| 270 | return dst;
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| 271 | }
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| 272 |
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| 273 |
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| 274 | /*
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| 275 | * strsvis, strsvisx - visually encode characters from src into dst
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| 276 | *
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| 277 | * Extra is a pointer to a \0-terminated list of characters to
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| 278 | * be encoded, too. These functions are useful e. g. to
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| 279 | * encode strings in such a way so that they are not interpreted
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| 280 | * by a shell.
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| 281 | *
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| 282 | * Dst must be 4 times the size of src to account for possible
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| 283 | * expansion. The length of dst, not including the trailing NULL,
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| 284 | * is returned.
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| 285 | *
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| 286 | * Strsvisx encodes exactly len bytes from src into dst.
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| 287 | * This is useful for encoding a block of data.
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| 288 | */
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| 289 | int ROKEN_LIB_FUNCTION
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| 290 | rk_strsvis(char *dst, const char *csrc, int flag, const char *extra)
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| 291 | {
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| 292 | int c;
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| 293 | char *start;
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| 294 | char *nextra = NULL;
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| 295 | const unsigned char *src = (const unsigned char *)csrc;
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| 296 |
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| 297 | _DIAGASSERT(dst != NULL);
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| 298 | _DIAGASSERT(src != NULL);
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| 299 | _DIAGASSERT(extra != NULL);
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| 300 | MAKEEXTRALIST(flag, nextra, extra);
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| 301 | if (!nextra) {
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| 302 | *dst = '\0'; /* can't create nextra, return "" */
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| 303 | return 0;
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| 304 | }
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| 305 | if (flag & VIS_HTTPSTYLE) {
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| 306 | for (start = dst; (c = *src++) != '\0'; /* empty */)
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| 307 | dst = do_hvis(dst, c, flag, *src, nextra);
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| 308 | } else {
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| 309 | for (start = dst; (c = *src++) != '\0'; /* empty */)
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| 310 | dst = do_svis(dst, c, flag, *src, nextra);
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| 311 | }
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| 312 | free(nextra);
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| 313 | *dst = '\0';
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| 314 | return (dst - start);
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| 315 | }
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| 316 |
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| 317 |
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| 318 | int ROKEN_LIB_FUNCTION
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| 319 | rk_strsvisx(char *dst, const char *csrc, size_t len, int flag, const char *extra)
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| 320 | {
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| 321 | unsigned char c;
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| 322 | char *start;
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| 323 | char *nextra = NULL;
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| 324 | const unsigned char *src = (const unsigned char *)csrc;
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| 325 |
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| 326 | _DIAGASSERT(dst != NULL);
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| 327 | _DIAGASSERT(src != NULL);
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| 328 | _DIAGASSERT(extra != NULL);
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| 329 | MAKEEXTRALIST(flag, nextra, extra);
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| 330 | if (! nextra) {
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| 331 | *dst = '\0'; /* can't create nextra, return "" */
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| 332 | return 0;
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| 333 | }
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| 334 |
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| 335 | if (flag & VIS_HTTPSTYLE) {
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| 336 | for (start = dst; len > 0; len--) {
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| 337 | c = *src++;
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| 338 | dst = do_hvis(dst, c, flag, len ? *src : '\0', nextra);
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| 339 | }
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| 340 | } else {
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| 341 | for (start = dst; len > 0; len--) {
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| 342 | c = *src++;
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| 343 | dst = do_svis(dst, c, flag, len ? *src : '\0', nextra);
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| 344 | }
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| 345 | }
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| 346 | free(nextra);
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| 347 | *dst = '\0';
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| 348 | return (dst - start);
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| 349 | }
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| 350 | #endif
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| 351 |
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| 352 | #if !HAVE_VIS
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| 353 | /*
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| 354 | * vis - visually encode characters
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| 355 | */
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| 356 | char * ROKEN_LIB_FUNCTION
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| 357 | rk_vis(char *dst, int c, int flag, int nextc)
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| 358 | {
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| 359 | char *extra = NULL;
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| 360 | unsigned char uc = (unsigned char)c;
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| 361 |
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| 362 | _DIAGASSERT(dst != NULL);
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| 363 |
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| 364 | MAKEEXTRALIST(flag, extra, "");
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| 365 | if (! extra) {
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| 366 | *dst = '\0'; /* can't create extra, return "" */
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| 367 | return dst;
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| 368 | }
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| 369 | if (flag & VIS_HTTPSTYLE)
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| 370 | dst = do_hvis(dst, uc, flag, nextc, extra);
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| 371 | else
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| 372 | dst = do_svis(dst, uc, flag, nextc, extra);
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| 373 | free(extra);
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| 374 | *dst = '\0';
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| 375 | return dst;
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| 376 | }
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| 377 |
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| 378 |
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| 379 | /*
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| 380 | * strvis, strvisx - visually encode characters from src into dst
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| 381 | *
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| 382 | * Dst must be 4 times the size of src to account for possible
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| 383 | * expansion. The length of dst, not including the trailing NULL,
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| 384 | * is returned.
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| 385 | *
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| 386 | * Strvisx encodes exactly len bytes from src into dst.
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| 387 | * This is useful for encoding a block of data.
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| 388 | */
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| 389 | int ROKEN_LIB_FUNCTION
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| 390 | rk_strvis(char *dst, const char *src, int flag)
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| 391 | {
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| 392 | char *extra = NULL;
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| 393 | int rv;
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| 394 |
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| 395 | MAKEEXTRALIST(flag, extra, "");
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| 396 | if (!extra) {
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| 397 | *dst = '\0'; /* can't create extra, return "" */
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| 398 | return 0;
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| 399 | }
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| 400 | rv = strsvis(dst, src, flag, extra);
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| 401 | free(extra);
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| 402 | return rv;
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| 403 | }
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| 404 |
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| 405 |
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| 406 | int ROKEN_LIB_FUNCTION
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| 407 | rk_strvisx(char *dst, const char *src, size_t len, int flag)
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| 408 | {
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| 409 | char *extra = NULL;
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| 410 | int rv;
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| 411 |
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| 412 | MAKEEXTRALIST(flag, extra, "");
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| 413 | if (!extra) {
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| 414 | *dst = '\0'; /* can't create extra, return "" */
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| 415 | return 0;
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| 416 | }
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| 417 | rv = strsvisx(dst, src, len, flag, extra);
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| 418 | free(extra);
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| 419 | return rv;
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| 420 | }
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| 421 | #endif
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