xapian-core/unicode/description_append.cc

   1 /** @file description_append.cc
   2  *  @brief Append a string to an object description, escaping invalid UTF-8
   3  */
   4 /* Copyright (C) 2013 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 <cstdio>
  27 #include <string>
  28
  29 using namespace std;
  30
  31 void
  32 description_append(std::string & desc, const std::string &s)
  33 {
  34     desc.reserve(desc.size() + s.size());
  35     for (Xapian::Utf8Iterator i(s); i != Xapian::Utf8Iterator(); ++i) {
  36         unsigned ch = i.strict_deref();
  37         if ((ch & 0x80000000) == 0 && ch >= ' ' && ch != '\\' && ch != 127) {
  38             Xapian::Unicode::append_utf8(desc, ch);
  39         } else {
  40             char buf[8];
  41             sprintf(buf, "\\x%02x", ch & 0xff);
  42             desc += buf;
  43         }
  44     }
  45 }