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/*
Samba string escaping routines
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2017
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "lib/util/debug.h"
#include "lib/util/util_str_escape.h"
/*
* Calculate the encoded length of a character for log_escape
*
*/
static size_t encoded_length(char c)
{
if (c != '\\' && c > 0x1F) {
return 1;
} else {
switch (c) {
case '\a':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
case '\\':
return 2; /* C escape sequence */
default:
return 4; /* hex escape \xhh */
}
}
}
/*
* Escape any control characters in the inputs to prevent them from
* interfering with the log output.
*/
char *log_escape(TALLOC_CTX *frame, const char *in)
{
size_t size = 0; /* Space to allocate for the escaped data */
char *encoded = NULL; /* The encoded string */
const char *c;
char *e;
if (in == NULL) {
return NULL;
}
/* Calculate the size required for the escaped array */
c = in;
while (*c) {
size += encoded_length( *c);
c++;
}
size++;
encoded = talloc_array( frame, char, size);
if (encoded == NULL) {
DBG_ERR( "Out of memory allocating encoded string\n");
return NULL;
}
c = in;
e = encoded;
while (*c) {
if (*c != '\\' && *c > 0x1F) {
*e++ = *c++;
} else {
switch (*c) {
case '\a':
*e++ = '\\';
*e++ = 'a';
break;
case '\b':
*e++ = '\\';
*e++ = 'b';
break;
case '\f':
*e++ = '\\';
*e++ = 'f';
break;
case '\n':
*e++ = '\\';
*e++ = 'n';
break;
case '\r':
*e++ = '\\';
*e++ = 'r';
break;
case '\t':
*e++ = '\\';
*e++ = 't';
break;
case '\v':
*e++ = '\\';
*e++ = 'v';
break;
case '\\':
*e++ = '\\';
*e++ = '\\';
break;
default:
snprintf(e, 5, "\\x%02X", *c);
e += 4;
}
c++;
}
}
*e = '\0';
return encoded;
}
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