text: /* Basic filename support macros.
     Copyright (C) 2001-2004, 2007-2018 Free Software Foundation, Inc.
  
     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 <https://www.gnu.org/licenses/>.  */
  
  #ifndef _FILENAME_H
  #define _FILENAME_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  
  /* Pathname support.
     ISSLASH(C)           tests whether C is a directory separator character.
     IS_ABSOLUTE_PATH(P)  tests whether P is an absolute path.  If it is not,
                          it may be concatenated to a directory pathname.
     IS_PATH_WITH_DIR(P)  tests whether P contains a directory specification.
   */
  #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
    /* Native Windows, Cygwin, OS/2, DOS */
  # define ISSLASH(C) ((C) == '/' || (C) == '\\')
  # define HAS_DEVICE(P) \
      ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
       && (P)[1] == ':')
  # define IS_ABSOLUTE_PATH(P) (ISSLASH ((P)[0]) || HAS_DEVICE (P))
  # define IS_PATH_WITH_DIR(P) \
      (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
  # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
  #else
    /* Unix */
  # define ISSLASH(C) ((C) == '/')
  # define IS_ABSOLUTE_PATH(P) ISSLASH ((P)[0])
  # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
  # define FILE_SYSTEM_PREFIX_LEN(P) 0
  #endif
  
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* _FILENAME_H */
  