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/*
* log-escape.c : Functions for escaping log items
* copied from Apache httpd
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#include <apr.h>
#define APR_WANT_STRFUNC
#include <apr_want.h>
#include "server.h"
#include "svn_ctype.h"
/* copied from httpd-2.2.4/server/util.c */
/* c2x takes an unsigned, and expects the caller has guaranteed that
* 0 <= what < 256... which usually means that you have to cast to
* unsigned char first, because (unsigned)(char)(x) first goes through
* signed extension to an int before the unsigned cast.
*
* The reason for this assumption is to assist gcc code generation --
* the unsigned char -> unsigned extension is already done earlier in
* both uses of this code, so there's no need to waste time doing it
* again.
*/
static const char c2x_table[] = "0123456789abcdef";
/* copied from httpd-2.2.4/server/util.c */
static APR_INLINE unsigned char *c2x(unsigned what, unsigned char prefix,
unsigned char *where)
{
#if APR_CHARSET_EBCDIC
what = apr_xlate_conv_byte(ap_hdrs_to_ascii, (unsigned char)what);
#endif /*APR_CHARSET_EBCDIC*/
*where++ = prefix;
*where++ = c2x_table[what >> 4];
*where++ = c2x_table[what & 0xf];
return where;
}
/* copied from httpd-2.2.4/server/util.c */
apr_size_t escape_errorlog_item(char *dest, const char *source,
apr_size_t buflen)
{
unsigned char *d, *ep;
const unsigned char *s;
if (!source || !buflen) { /* be safe */
return 0;
}
d = (unsigned char *)dest;
s = (const unsigned char *)source;
ep = d + buflen - 1;
for (; d < ep && *s; ++s) {
/* httpd-2.2.4/server/util.c has this:
if (TEST_CHAR(*s, T_ESCAPE_LOGITEM)) {
which does this same check with a fast lookup table. Well,
mostly the same; we don't escape quotes, as that does.
*/
if (*s && ( !svn_ctype_isprint(*s)
|| *s == '\\'
|| svn_ctype_iscntrl(*s))) {
*d++ = '\\';
if (d >= ep) {
--d;
break;
}
switch(*s) {
case '\b':
*d++ = 'b';
break;
case '\n':
*d++ = 'n';
break;
case '\r':
*d++ = 'r';
break;
case '\t':
*d++ = 't';
break;
case '\v':
*d++ = 'v';
break;
case '\\':
*d++ = *s;
break;
case '"': /* no need for this in error log */
d[-1] = *s;
break;
default:
if (d >= ep - 2) {
ep = --d; /* break the for loop as well */
break;
}
c2x(*s, 'x', d);
d += 3;
}
}
else {
*d++ = *s;
}
}
*d = '\0';
return (d - (unsigned char *)dest);
}
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