426 lines
11 KiB
C
426 lines
11 KiB
C
/* $NetBSD: vis.c,v 1.41 2009/11/23 10:08:47 plunky 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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/*-
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* Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: vis.c,v 1.41 2009/11/23 10:08:47 plunky Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <assert.h>
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#include <vis.h>
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#include <stdlib.h>
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#ifdef _LIBC
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#ifdef __weak_alias
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__weak_alias(strsvis,_strsvis)
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__weak_alias(strsvisx,_strsvisx)
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__weak_alias(strvis,_strvis)
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__weak_alias(strvisx,_strvisx)
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__weak_alias(svis,_svis)
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__weak_alias(vis,_vis)
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#endif
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#endif
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#if !HAVE_VIS || !HAVE_SVIS
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#include <ctype.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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static char *do_svis(char *, int, int, int, const char *);
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#undef BELL
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#define BELL '\a'
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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#define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
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#define issafe(c) (c == '\b' || c == BELL || c == '\r')
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#define xtoa(c) "0123456789abcdef"[c]
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#define XTOA(c) "0123456789ABCDEF"[c]
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#define MAXEXTRAS 5
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#define MAKEEXTRALIST(flag, extra, orig_str) \
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do { \
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const char *orig = orig_str; \
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const char *o = orig; \
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char *e; \
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while (*o++) \
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continue; \
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extra = malloc((size_t)((o - orig) + MAXEXTRAS)); \
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if (!extra) break; \
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for (o = orig, e = extra; (*e++ = *o++) != '\0';) \
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continue; \
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e--; \
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if (flag & VIS_SP) *e++ = ' '; \
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if (flag & VIS_TAB) *e++ = '\t'; \
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if (flag & VIS_NL) *e++ = '\n'; \
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if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \
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*e = '\0'; \
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} while (/*CONSTCOND*/0)
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/*
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* This is do_hvis, for HTTP style (RFC 1808)
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*/
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static char *
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do_hvis(char *dst, int c, int flag, int nextc, const char *extra)
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{
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if ((isascii(c) && isalnum(c))
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/* safe */
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|| c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
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/* extra */
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|| c == '!' || c == '*' || c == '\'' || c == '(' || c == ')'
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|| c == ',') {
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dst = do_svis(dst, c, flag, nextc, extra);
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} else {
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*dst++ = '%';
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*dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
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*dst++ = xtoa((unsigned int)c & 0xf);
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}
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return dst;
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}
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/*
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* This is do_mvis, for Quoted-Printable MIME (RFC 2045)
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* NB: No handling of long lines or CRLF.
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*/
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static char *
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do_mvis(char *dst, int c, int flag, int nextc, const char *extra)
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{
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if ((c != '\n') &&
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/* Space at the end of the line */
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((isspace(c) && (nextc == '\r' || nextc == '\n')) ||
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/* Out of range */
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(!isspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
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/* Specific char to be escaped */
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strchr("#$@[\\]^`{|}~", c) != NULL)) {
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*dst++ = '=';
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*dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
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*dst++ = XTOA((unsigned int)c & 0xf);
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} else {
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dst = do_svis(dst, c, flag, nextc, extra);
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}
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return dst;
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}
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/*
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* This is do_vis, the central code of vis.
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* dst: Pointer to the destination buffer
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* c: Character to encode
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* flag: Flag word
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* nextc: The character following 'c'
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* extra: Pointer to the list of extra characters to be
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* backslash-protected.
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*/
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static char *
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do_svis(char *dst, int c, int flag, int nextc, const char *extra)
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{
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int isextra;
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isextra = strchr(extra, c) != NULL;
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if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) ||
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((flag & VIS_SAFE) && issafe(c)))) {
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*dst++ = c;
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return dst;
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}
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if (flag & VIS_CSTYLE) {
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switch (c) {
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case '\n':
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*dst++ = '\\'; *dst++ = 'n';
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return dst;
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case '\r':
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*dst++ = '\\'; *dst++ = 'r';
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return dst;
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case '\b':
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*dst++ = '\\'; *dst++ = 'b';
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return dst;
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case BELL:
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*dst++ = '\\'; *dst++ = 'a';
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return dst;
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case '\v':
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*dst++ = '\\'; *dst++ = 'v';
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return dst;
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case '\t':
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*dst++ = '\\'; *dst++ = 't';
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return dst;
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case '\f':
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*dst++ = '\\'; *dst++ = 'f';
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return dst;
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case ' ':
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*dst++ = '\\'; *dst++ = 's';
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return dst;
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case '\0':
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*dst++ = '\\'; *dst++ = '0';
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if (isoctal(nextc)) {
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*dst++ = '0';
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*dst++ = '0';
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}
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return dst;
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default:
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if (isgraph(c)) {
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*dst++ = '\\'; *dst++ = c;
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return dst;
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}
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}
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}
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if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
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*dst++ = '\\';
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*dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0';
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*dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0';
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*dst++ = (c & 07) + '0';
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} else {
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if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\';
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if (c & 0200) {
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c &= 0177; *dst++ = 'M';
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}
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if (iscntrl(c)) {
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*dst++ = '^';
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if (c == 0177)
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*dst++ = '?';
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else
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*dst++ = c + '@';
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} else {
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*dst++ = '-'; *dst++ = c;
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}
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}
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return dst;
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}
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typedef char *(*visfun_t)(char *, int, int, int, const char *);
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/*
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* Return the appropriate encoding function depending on the flags given.
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*/
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static visfun_t
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getvisfun(int flag)
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{
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if (flag & VIS_HTTPSTYLE)
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return do_hvis;
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if (flag & VIS_MIMESTYLE)
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return do_mvis;
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return do_svis;
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}
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/*
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* svis - visually encode characters, also encoding the characters
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* pointed to by `extra'
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*/
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char *
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svis(char *dst, int c, int flag, int nextc, const char *extra)
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{
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char *nextra = NULL;
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visfun_t f;
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_DIAGASSERT(dst != NULL);
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_DIAGASSERT(extra != NULL);
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MAKEEXTRALIST(flag, nextra, extra);
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if (!nextra) {
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*dst = '\0'; /* can't create nextra, return "" */
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return dst;
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}
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f = getvisfun(flag);
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dst = (*f)(dst, c, flag, nextc, nextra);
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free(nextra);
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*dst = '\0';
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return dst;
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}
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/*
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* strsvis, strsvisx - visually encode characters from src into dst
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*
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* Extra is a pointer to a \0-terminated list of characters to
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* be encoded, too. These functions are useful e. g. to
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* encode strings in such a way so that they are not interpreted
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* by a shell.
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*
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* Dst must be 4 times the size of src to account for possible
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* expansion. The length of dst, not including the trailing NULL,
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* is returned.
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*
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* Strsvisx encodes exactly len bytes from src into dst.
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* This is useful for encoding a block of data.
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*/
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int
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strsvis(char *dst, const char *csrc, int flag, const char *extra)
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{
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int c;
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char *start;
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char *nextra = NULL;
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const unsigned char *src = (const unsigned char *)csrc;
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visfun_t f;
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_DIAGASSERT(dst != NULL);
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_DIAGASSERT(src != NULL);
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_DIAGASSERT(extra != NULL);
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MAKEEXTRALIST(flag, nextra, extra);
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if (!nextra) {
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*dst = '\0'; /* can't create nextra, return "" */
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return 0;
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}
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f = getvisfun(flag);
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for (start = dst; (c = *src++) != '\0'; /* empty */)
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dst = (*f)(dst, c, flag, *src, nextra);
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free(nextra);
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*dst = '\0';
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return (int)(dst - start);
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}
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int
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strsvisx(char *dst, const char *csrc, size_t len, int flag, const char *extra)
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{
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unsigned char c;
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char *start;
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char *nextra = NULL;
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const unsigned char *src = (const unsigned char *)csrc;
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visfun_t f;
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_DIAGASSERT(dst != NULL);
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_DIAGASSERT(src != NULL);
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_DIAGASSERT(extra != NULL);
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MAKEEXTRALIST(flag, nextra, extra);
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if (! nextra) {
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*dst = '\0'; /* can't create nextra, return "" */
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return 0;
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}
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f = getvisfun(flag);
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for (start = dst; len > 0; len--) {
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c = *src++;
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dst = (*f)(dst, c, flag, len > 1 ? *src : '\0', nextra);
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}
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free(nextra);
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*dst = '\0';
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return (int)(dst - start);
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}
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#endif
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#if !HAVE_VIS
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/*
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* vis - visually encode characters
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*/
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char *
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vis(char *dst, int c, int flag, int nextc)
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{
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char *extra = NULL;
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unsigned char uc = (unsigned char)c;
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visfun_t f;
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_DIAGASSERT(dst != NULL);
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MAKEEXTRALIST(flag, extra, "");
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if (! extra) {
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*dst = '\0'; /* can't create extra, return "" */
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return dst;
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}
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f = getvisfun(flag);
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dst = (*f)(dst, uc, flag, nextc, extra);
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free(extra);
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*dst = '\0';
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return dst;
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}
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/*
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* strvis, strvisx - visually encode characters from src into dst
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*
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* Dst must be 4 times the size of src to account for possible
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* expansion. The length of dst, not including the trailing NULL,
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* is returned.
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*
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* Strvisx encodes exactly len bytes from src into dst.
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* This is useful for encoding a block of data.
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*/
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int
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strvis(char *dst, const char *src, int flag)
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{
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char *extra = NULL;
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int rv;
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MAKEEXTRALIST(flag, extra, "");
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if (!extra) {
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*dst = '\0'; /* can't create extra, return "" */
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return 0;
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}
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rv = strsvis(dst, src, flag, extra);
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free(extra);
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return rv;
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}
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int
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strvisx(char *dst, const char *src, size_t len, int flag)
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{
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char *extra = NULL;
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int rv;
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MAKEEXTRALIST(flag, extra, "");
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if (!extra) {
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*dst = '\0'; /* can't create extra, return "" */
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return 0;
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}
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rv = strsvisx(dst, src, len, flag, extra);
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free(extra);
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return rv;
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}
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#endif
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