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heimdal/lib/roken/vis.c
Nicolas Williams 0bbf13722d roken: Remove dead code in rk_strsvisx()
2022-01-17 17:49:29 -06:00

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/* $NetBSD: vis.c,v 1.37 2008/07/25 22:29:23 dsl Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*-
* Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define _DEFAULT_SOURCE
#include <config.h>
#include "roken.h"
#ifdef TEST
#include "getarg.h"
#endif
#ifndef _DIAGASSERT
#define _DIAGASSERT(X)
#endif
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#ifdef TEST
#include <err.h>
#endif
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <vis.h>
#if !HAVE_VIS || !HAVE_SVIS
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#endif
#if !HAVE_VIS || !HAVE_SVIS || TEST
/*
* We use makextralist() in main(), so we need it even if we have all the VIS
* routines in the host's C libraries.
*/
/* 5 is for VIS_SP, VIS_TAB, VIS_NL, VIS_DQ, and VIS_NOSLASH */
#define MAXEXTRAS (sizeof(char_glob) - 1 + sizeof(char_shell) - 1 + 5)
#ifndef VIS_SHELL
#define VIS_SHELL 0x2000
#endif
#ifndef VIS_GLOB
#define VIS_GLOB 0x0100
#endif
#ifndef VIS_SP
#define VIS_SP 0x0004 /* also encode space */
#endif
#ifndef VIS_TAB
#define VIS_TAB 0x0008 /* also encode tab */
#endif
#ifndef VIS_NL
#define VIS_NL 0x0010 /* also encode newline */
#endif
#ifndef VIS_WHITE
#define VIS_WHITE (VIS_SP | VIS_TAB | VIS_NL)
#endif
#ifndef VIS_SAFE
#define VIS_SAFE 0x0020 /* only encode "unsafe" characters */
#endif
#ifndef VIS_DQ
#define VIS_DQ 0x8000 /* also encode double quotes */
#endif
/*
* Expand list of extra characters to not visually encode.
*/
static char *
makeextralist(int flags, const char *src)
{
static const char char_glob[] = "*?[#";
static const char char_shell[] = "'`\";&<>()|{}]\\$!^~";
char *dst, *d;
size_t len;
len = strlen(src);
if ((dst = d = calloc(1, len + MAXEXTRAS + 1)) == NULL)
return NULL;
memcpy(dst, src, len);
d += len;
if (flags & VIS_GLOB) {
memcpy(d, char_glob, sizeof(char_glob) - 1);
d += sizeof(char_glob) - 1;
}
if (flags & VIS_SHELL) {
memcpy(d, char_shell, sizeof(char_shell) - 1);
d += sizeof(char_shell) - 1;
}
if (flags & VIS_SP) *d++ = ' ';
if (flags & VIS_TAB) *d++ = '\t';
if (flags & VIS_NL) *d++ = '\n';
if (flags & VIS_DQ) *d++ = '"';
if ((flags & VIS_NOSLASH) == 0) *d++ = '\\';
return dst;
}
#endif
#if !HAVE_VIS || !HAVE_SVIS
static char *do_svis(char *, int, int, int, const char *);
#undef BELL
#if defined(__STDC__)
#define BELL '\a'
#else
#define BELL '\007'
#endif
ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
rk_vis (char *, int, int, int);
ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
rk_svis (char *, int, int, int, const char *);
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strvis (char *, const char *, int);
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strsvis (char *, const char *, int, const char *);
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strvisx (char *, const char *, size_t, int);
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strsvisx (char *, const char *, size_t, int, const char *);
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
#define issafe(c) (c == '\b' || c == BELL || c == '\r')
#define xtoa(c) "0123456789abcdef"[c]
/*
* This is do_hvis, for HTTP style (RFC 1808)
*/
static char *
do_hvis(char *dst, int c, int flag, int nextc, const char *extra)
{
if (!isascii(c) || !isalnum(c) || strchr("$-_.+!*'(),", c) != NULL ||
strchr(extra, c)) {
*dst++ = '%';
*dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
*dst++ = xtoa((unsigned int)c & 0xf);
} else {
dst = do_svis(dst, c, flag, nextc, extra);
}
return dst;
}
/*
* This is do_vis, the central code of vis.
* dst: Pointer to the destination buffer
* c: Character to encode
* flag: Flag word
* nextc: The character following 'c'
* extra: Pointer to the list of extra characters to be
* backslash-protected.
*/
static char *
do_svis(char *dst, int c, int flag, int nextc, const char *extra)
{
int isextra;
isextra = strchr(extra, c) != NULL;
if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) ||
((flag & VIS_SAFE) && issafe(c)))) {
*dst++ = c;
return dst;
}
if (flag & VIS_CSTYLE) {
switch (c) {
case '\n':
*dst++ = '\\'; *dst++ = 'n';
return dst;
case '\r':
*dst++ = '\\'; *dst++ = 'r';
return dst;
case '\b':
*dst++ = '\\'; *dst++ = 'b';
return dst;
case BELL:
*dst++ = '\\'; *dst++ = 'a';
return dst;
case '\v':
*dst++ = '\\'; *dst++ = 'v';
return dst;
case '\t':
*dst++ = '\\'; *dst++ = 't';
return dst;
case '\f':
*dst++ = '\\'; *dst++ = 'f';
return dst;
case ' ':
*dst++ = '\\'; *dst++ = 's';
return dst;
case '\0':
*dst++ = '\\'; *dst++ = '0';
if (isoctal(nextc)) {
*dst++ = '0';
*dst++ = '0';
}
return dst;
default:
if (isgraph(c)) {
*dst++ = '\\'; *dst++ = c;
return dst;
}
}
}
if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
*dst++ = '\\';
*dst++ = (u_char)(((unsigned int)(u_char)c >> 6) & 03) + '0';
*dst++ = (u_char)(((unsigned int)(u_char)c >> 3) & 07) + '0';
*dst++ = (u_char)( c & 07) + '0';
} else {
if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\';
if (c & 0200) {
c &= 0177; *dst++ = 'M';
}
if (iscntrl(c)) {
*dst++ = '^';
if (c == 0177)
*dst++ = '?';
else
*dst++ = c + '@';
} else {
*dst++ = '-'; *dst++ = c;
}
}
return dst;
}
/*
* svis - visually encode characters, also encoding the characters
* pointed to by `extra'
*/
ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
rk_svis(char *dst, int c, int flag, int nextc, const char *extra)
{
char *nextra = NULL;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(extra != NULL);
nextra = makeextralist(flag, extra);
if (!nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return dst;
}
if (flag & VIS_HTTPSTYLE)
dst = do_hvis(dst, c, flag, nextc, nextra);
else
dst = do_svis(dst, c, flag, nextc, nextra);
free(nextra);
*dst = '\0';
return dst;
}
/*
* strsvis, strsvisx - visually encode characters from src into dst
*
* Extra is a pointer to a \0-terminated list of characters to
* be encoded, too. These functions are useful e. g. to
* encode strings in such a way so that they are not interpreted
* by a shell.
*
* Dst must be 4 times the size of src to account for possible
* expansion. The length of dst, not including the trailing NULL,
* is returned.
*
* Strsvisx encodes exactly len bytes from src into dst.
* This is useful for encoding a block of data.
*/
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strsvis(char *dst, const char *csrc, int flag, const char *extra)
{
int c;
char *start;
char *nextra = NULL;
const unsigned char *src = (const unsigned char *)csrc;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
_DIAGASSERT(extra != NULL);
nextra = makeextralist(flag, extra);
if (!nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return 0;
}
if (flag & VIS_HTTPSTYLE) {
for (start = dst; (c = *src++) != '\0'; /* empty */)
dst = do_hvis(dst, c, flag, *src, nextra);
} else {
for (start = dst; (c = *src++) != '\0'; /* empty */)
dst = do_svis(dst, c, flag, *src, nextra);
}
free(nextra);
*dst = '\0';
return (dst - start);
}
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strsvisx(char *dst, const char *csrc, size_t len, int flag, const char *extra)
{
unsigned char c;
char *start;
char *nextra = NULL;
const unsigned char *src = (const unsigned char *)csrc;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
_DIAGASSERT(extra != NULL);
nextra = makeextralist(flag, extra);
if (! nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return 0;
}
if (flag & VIS_HTTPSTYLE) {
for (start = dst; len > 0; len--) {
c = *src++;
dst = do_hvis(dst, c, flag, *src, nextra);
}
} else {
for (start = dst; len > 0; len--) {
c = *src++;
dst = do_svis(dst, c, flag, *src, nextra);
}
}
free(nextra);
*dst = '\0';
return (dst - start);
}
#endif
/*
* Heimdal innovations: functions that allocate or reallocate a destination
* buffer as needed. Based on OpenBSD's stravis().
*/
#include <vis-extras.h>
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strasvis(char **out, const char *csrc, int flag, const char *extra)
{
return rk_strasvisx(out, csrc, strlen(csrc), flag, extra);
}
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strrasvis(char **out, size_t *outsz, const char *csrc, int flag, const char *extra)
{
return rk_strrasvisx(out, outsz, csrc, strlen(csrc), flag, extra);
}
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strasvisx(char **out, const char *csrc, size_t len, int flag, const char *extra)
{
size_t sz = 0;
*out = NULL;
return rk_strrasvisx(out, &sz, csrc, strlen(csrc), flag, extra);
}
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strrasvisx(char **out,
size_t *outsz,
const char *csrc,
size_t len,
int flag,
const char *extra)
{
size_t want = 4 * len + 4;
size_t have = *outsz;
char *s = *out;
int r;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
_DIAGASSERT(extra != NULL);
if (want < len || want > INT_MAX) {
errno = EOVERFLOW;
return -1;
}
if (have < want) {
if ((s = realloc(s, want)) == NULL)
return -1;
*outsz = want;
*out = s;
}
if (*out == NULL) {
errno = EINVAL;
return -1;
}
**out = '\0'; /* Makes source debugging nicer, that's all */
r = strsvisx(*out, csrc, len, flag, extra);
return r;
}
#if !HAVE_VIS
/*
* vis - visually encode characters
*/
ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
rk_vis(char *dst, int c, int flag, int nextc)
{
char *extra = NULL;
unsigned char uc = (unsigned char)c;
_DIAGASSERT(dst != NULL);
extra = makeextralist(flag, "");
if (! extra) {
*dst = '\0'; /* can't create extra, return "" */
return dst;
}
if (flag & VIS_HTTPSTYLE)
dst = do_hvis(dst, uc, flag, nextc, extra);
else
dst = do_svis(dst, uc, flag, nextc, extra);
free(extra);
*dst = '\0';
return dst;
}
/*
* strvis, strvisx - visually encode characters from src into dst
*
* Dst must be 4 times the size of src to account for possible
* expansion. The length of dst, not including the trailing NULL,
* is returned.
*
* Strvisx encodes exactly len bytes from src into dst.
* This is useful for encoding a block of data.
*/
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strvis(char *dst, const char *src, int flag)
{
char *extra = NULL;
int rv;
extra = makeextralist(flag, "");
if (!extra) {
*dst = '\0'; /* can't create extra, return "" */
return 0;
}
rv = strsvis(dst, src, flag, extra);
free(extra);
return rv;
}
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
rk_strvisx(char *dst, const char *src, size_t len, int flag)
{
char *extra = NULL;
int rv;
extra = makeextralist(flag, "");
if (!extra) {
*dst = '\0'; /* can't create extra, return "" */
return 0;
}
rv = strsvisx(dst, src, len, flag, extra);
free(extra);
return rv;
}
#endif
#ifdef TEST
static const char *extra_arg = "";
static int cstyle_flag;
static int glob_flag;
static int help_flag;
static int http_flag;
static int httponly_flag;
static int line_flag;
static int octal_flag;
static int safe_flag;
static int shell_flag;
static int stdin_flag;
static int tab_flag;
static int whitespace_flag;
/*
* The short options are compatible with a subset of the FreeBSD contrib
* vis(1). Heimdal additions have long option names only.
*/
static struct getargs args[] = {
{ "c", 'C', arg_flag, &cstyle_flag, "C style", "C style" },
{ "extra", 'e', arg_string, &extra_arg, "also encode extra", "also encode extra"},
{ "glob", 'g', arg_flag, &glob_flag, "escape glob specials", "escape glob specials" },
{ "help", 0, arg_flag, &help_flag, "help", "help"},
{ "line", 0, arg_flag, &line_flag, "read and escape stdin without escaping newlines", NULL },
{ "octal", 'o', arg_flag, &octal_flag, "octal escape", "octal escape" },
{ "safe", 's', arg_flag, &safe_flag, "only encode \"unsafe\" characters", "only encode \"unsafe\" characters" },
{ "shell", 'S', arg_flag, &shell_flag, "encode shell meta-characters", "encode shell meta-characters" },
{ "stdin", 0, arg_flag, &stdin_flag, "read and escape stdin", NULL },
{ "tab", 't', arg_flag, &tab_flag, "encode tabs", "encode tabs" },
{ "url", 'h', arg_flag, &http_flag, "url escape", "url escape" },
{ "url-only", 0, arg_flag, &httponly_flag, "url escape", "url escape" },
{ "whitespace", 'w', arg_flag, &whitespace_flag, "encode whitespace", "encode whitespace" },
{ 0, 0, 0, 0, 0, 0}
};
static size_t num_args = sizeof(args)/sizeof(args[0]);
int
main(int argc, char **argv)
{
size_t sz = 0;
char *nextra = NULL;
char *s = NULL;
int goptind = 0;
int flags = 0;
setprogname("vis");
if (getarg(args, num_args, argc, argv, &goptind) || help_flag) {
arg_printusage(args, num_args, NULL, "strings...");
return help_flag ? 0 : 1;
}
argc -= goptind;
argv += goptind;
if (argc == 0 && !stdin_flag && !line_flag) {
arg_printusage(args, num_args, NULL, "strings...");
return 1;
}
if (http_flag && cstyle_flag)
errx(1, "--http and --cstyle are mutually exclusive");
flags |= cstyle_flag ? VIS_CSTYLE : 0;
flags |= http_flag ? VIS_HTTPSTYLE : 0;
flags |= httponly_flag ? VIS_HTTPSTYLE | VIS_NOESCAPE : 0;
flags |= octal_flag ? VIS_OCTAL : 0;
flags |= safe_flag ? VIS_SAFE : 0;
flags |= tab_flag ? VIS_TAB : 0;
flags |= whitespace_flag ? VIS_WHITE : 0;
if ((nextra = makeextralist(flags, extra_arg)) == NULL)
err(1, "Out of memory");
while (argc) {
if (rk_strrasvis(&s, &sz, argv[0], flags, nextra) < 0)
err(2, "Out of memory");
printf("%s\n", s);
argc--;
}
if (line_flag) {
ssize_t nbytes;
size_t linesz = 0;
char *line = NULL;
while (!feof(stdin) &&
(nbytes = getline(&line, &linesz, stdin)) > 0) {
const char *nl = "";
if (line[nbytes - 1] == '\n') {
line[--nbytes] = '\0';
nl = "\n";
}
if (rk_strrasvisx(&s, &sz, line, nbytes, flags, nextra) < 0)
err(2, "Out of memory");
printf("%s%s", s, nl);
}
fflush(stdout);
if (ferror(stdin))
errx(2, "I/O error");
} else if (stdin_flag) {
size_t nbytes;
char buf[2048 + 1];
char vbuf[4 * (sizeof(buf) - 1) + 1];
while (!feof(stdin) &&
(nbytes = fread(buf, 1, sizeof(buf) - 1, stdin))) {
buf[nbytes] = '\0';
strsvis(vbuf, buf, flags, nextra);
printf("%s", vbuf);
}
fflush(stdout);
if (ferror(stdin))
errx(2, "I/O error");
}
free(nextra);
free(s);
return 0;
}
#endif
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