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NetBSD/lib/libc/gen/vis.c

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/* $NetBSD: vis.c,v 1.35 2006/08/28 20:42:12 christos 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.
* 3. Neither the name of The NetBSD Foundation 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 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: vis.c,v 1.35 2006/08/28 20:42:12 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <assert.h>
#include <vis.h>
#include <stdlib.h>
#ifdef __weak_alias
__weak_alias(strsvis,_strsvis)
__weak_alias(strsvisx,_strsvisx)
__weak_alias(strvis,_strvis)
__weak_alias(strvisx,_strvisx)
__weak_alias(svis,_svis)
__weak_alias(vis,_vis)
#endif
#if !HAVE_VIS || !HAVE_SVIS
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#undef BELL
#define BELL '\a'
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
#define issafe(c) (c == '\b' || c == BELL || c == '\r')
#define xtoa(c) "0123456789abcdef"[c]
#define MAXEXTRAS 5
#define MAKEEXTRALIST(flag, extra, orig_str) \
do { \
const char *orig = orig_str; \
const char *o = orig; \
char *e; \
while (*o++) \
continue; \
extra = malloc((size_t)((o - orig) + MAXEXTRAS)); \
if (!extra) break; \
for (o = orig, e = extra; (*e++ = *o++) != '\0';) \
continue; \
e--; \
if (flag & VIS_SP) *e++ = ' '; \
if (flag & VIS_TAB) *e++ = '\t'; \
if (flag & VIS_NL) *e++ = '\n'; \
if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \
*e = '\0'; \
} while (/*CONSTCOND*/0)
/*
* This is HVIS, the macro of vis used to HTTP style (RFC 1808)
*/
#define HVIS(dst, c, flag, nextc, extra) \
do \
if (!isascii(c) || !isalnum(c) || strchr("$-_.+!*'(),", c) != NULL) { \
*dst++ = '%'; \
*dst++ = xtoa(((unsigned int)c >> 4) & 0xf); \
*dst++ = xtoa((unsigned int)c & 0xf); \
} else { \
SVIS(dst, c, flag, nextc, extra); \
} \
while (/*CONSTCOND*/0)
/*
* This is SVIS, the central macro 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.
*/
#define SVIS(dst, c, flag, nextc, extra) \
do { \
int isextra; \
isextra = strchr(extra, c) != NULL; \
if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) || \
((flag & VIS_SAFE) && issafe(c)))) { \
*dst++ = c; \
break; \
} \
if (flag & VIS_CSTYLE) { \
switch (c) { \
case '\n': \
*dst++ = '\\'; *dst++ = 'n'; \
continue; \
case '\r': \
*dst++ = '\\'; *dst++ = 'r'; \
continue; \
case '\b': \
*dst++ = '\\'; *dst++ = 'b'; \
continue; \
case BELL: \
*dst++ = '\\'; *dst++ = 'a'; \
continue; \
case '\v': \
*dst++ = '\\'; *dst++ = 'v'; \
continue; \
case '\t': \
*dst++ = '\\'; *dst++ = 't'; \
continue; \
case '\f': \
*dst++ = '\\'; *dst++ = 'f'; \
continue; \
case ' ': \
*dst++ = '\\'; *dst++ = 's'; \
continue; \
case '\0': \
*dst++ = '\\'; *dst++ = '0'; \
if (isoctal(nextc)) { \
*dst++ = '0'; \
*dst++ = '0'; \
} \
continue; \
default: \
if (isgraph(c)) { \
*dst++ = '\\'; *dst++ = c; \
continue; \
} \
} \
} \
if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) { \
*dst++ = '\\'; \
*dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0'; \
*dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0'; \
*dst++ = (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; \
} \
} \
} while (/*CONSTCOND*/0)
/*
* svis - visually encode characters, also encoding the characters
* pointed to by `extra'
*/
char *
svis(char *dst, int c, int flag, int nextc, const char *extra)
{
char *nextra = NULL;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(extra != NULL);
MAKEEXTRALIST(flag, nextra, extra);
if (!nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return dst;
}
if (flag & VIS_HTTPSTYLE)
HVIS(dst, c, flag, nextc, nextra);
else
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.
*/
int
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);
MAKEEXTRALIST(flag, nextra, extra);
if (!nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return 0;
}
if (flag & VIS_HTTPSTYLE) {
for (start = dst; (c = *src++) != '\0'; /* empty */)
HVIS(dst, c, flag, *src, nextra);
} else {
for (start = dst; (c = *src++) != '\0'; /* empty */)
SVIS(dst, c, flag, *src, nextra);
}
free(nextra);
*dst = '\0';
return (dst - start);
}
int
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);
MAKEEXTRALIST(flag, nextra, extra);
if (! nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return 0;
}
if (flag & VIS_HTTPSTYLE) {
for (start = dst; len > 0; len--) {
c = *src++;
HVIS(dst, c, flag, len ? *src : '\0', nextra);
}
} else {
for (start = dst; len > 0; len--) {
c = *src++;
SVIS(dst, c, flag, len ? *src : '\0', nextra);
}
}
free(nextra);
*dst = '\0';
return (dst - start);
}
#endif
#if !HAVE_VIS
/*
* vis - visually encode characters
*/
char *
vis(char *dst, int c, int flag, int nextc)
{
char *extra = NULL;
unsigned char uc = (unsigned char)c;
_DIAGASSERT(dst != NULL);
MAKEEXTRALIST(flag, extra, "");
if (! extra) {
*dst = '\0'; /* can't create extra, return "" */
return dst;
}
if (flag & VIS_HTTPSTYLE)
HVIS(dst, uc, flag, nextc, extra);
else
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.
*/
int
strvis(char *dst, const char *src, int flag)
{
char *extra = NULL;
int rv;
MAKEEXTRALIST(flag, extra, "");
if (!extra) {
*dst = '\0'; /* can't create extra, return "" */
return 0;
}
rv = strsvis(dst, src, flag, extra);
free(extra);
return rv;
}
int
strvisx(char *dst, const char *src, size_t len, int flag)
{
char *extra = NULL;
int rv;
MAKEEXTRALIST(flag, extra, "");
if (!extra) {
*dst = '\0'; /* can't create extra, return "" */
return 0;
}
rv = strsvisx(dst, src, len, flag, extra);
free(extra);
return rv;
}
#endif
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