my_basename.h

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/* Copyright (c) 2017, 2025, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
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   the program or referenced in the documentation.
 
   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, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef MY_BASENAME_INCLUDED
#define MY_BASENAME_INCLUDED
 
/**
  @file include/my_basename.h
  A macro that gives __FILE__ without the directory name (e.g. foo.cc instead of
  ../sql/foo.cc), calculated compile-time. Note that the entire __FILE__
  string is still present in the binary; only the pointer is adjusted.
*/
 
static constexpr int basename_index(const char *const path, const int index) {
  return (index == -1 || path[index] == '/' || path[index] == '\\')
             ? index + 1
             : basename_index(path, index - 1);
}
 
#define MY_BASENAME (&__FILE__[basename_index(__FILE__, sizeof(__FILE__) - 1)])
 
#ifndef LOG_SUBSYSTEM_TAG
constexpr const char *basename_prefix_eval(const char *const path) {
  return (path[0] == 'r' && path[1] == 'p' && path[2] == 'l' && path[3] == '_')
             ? "Repl"
             : nullptr;
}
 
constexpr int basename_prefix_find(const char *const path, const int index) {
  return (path[index] == '/' || path[index] == '\\')
             ? index + 1
             : basename_prefix_find(path, index - 1);
}
 
#define LOG_SUBSYSTEM_TAG \
  basename_prefix_eval(   \
      &__FILE__[basename_prefix_find(__FILE__, sizeof(__FILE__) - 1)])
 
#endif
 
#endif  // MY_BASENAME_INCLUDED