xapian-applications/omega/utf8convert.h

   1 /** @file
   2  * @brief convert a string to UTF-8 encoding.
   3  */
   4 /* Copyright (C) 2006,2021,2023 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 #ifndef OMEGA_INCLUDED_UTF8CONVERT_H
  22 #define OMEGA_INCLUDED_UTF8CONVERT_H
  23
  24 #include <string>
  25 #include <string_view>
  26
  27 // Internal helper.
  28 bool convert_to_utf8_(std::string_view text, const std::string& charset,
  29                       std::string& output);
  30
  31 // Convert in-place (avoids copy if already UTF-8).
  32 inline void convert_to_utf8(std::string& text, const std::string& charset)
  33 {
  34     (void)convert_to_utf8_(text, charset, text);
  35 }
  36
  37 inline void convert_to_utf8(std::string_view text, const std::string& charset,
  38                             std::string& output)
  39 {
  40     if (!convert_to_utf8_(text, charset, output))
  41         output = text;
  42 }
  43
  44 #endif // OMEGA_INCLUDED_UTF8CONVERT_H