xapian-core  1.4.21
description_append.cc
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1 
4 /* Copyright (C) 2013,2019 Olly Betts
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <config.h>
22 
23 #include "description_append.h"
24 #include "xapian/unicode.h"
25 
26 #include <string>
27 
28 using namespace std;
29 
30 void
31 description_append(std::string& desc, const std::string& s)
32 {
33  desc.reserve(desc.size() + s.size());
34  for (Xapian::Utf8Iterator i(s); i != Xapian::Utf8Iterator(); ++i) {
35  unsigned ch = i.strict_deref();
36  if ((ch & 0x80000000) == 0 && ch >= ' ' && ch != '\\' && ch != 127) {
38  } else {
39  desc.append("\\x", 2);
40  desc += "0123456789abcdef"[(ch >> 4) & 0x0f];
41  desc += "0123456789abcdef"[ch & 0x0f];
42  }
43  }
44 }
Unicode and UTF-8 related classes and functions.
void append_utf8(std::string &s, unsigned ch)
Append the UTF-8 representation of a single Unicode character to a std::string.
Definition: unicode.h:332
STL namespace.
void description_append(std::string &desc, const std::string &s)
Append a string to an object description, escaping invalid UTF-8.
An iterator which returns Unicode character values from a UTF-8 encoded string.
Definition: unicode.h:38