/* File names on MS-DOS/Windows systems.

   Copyright (C) 2000-2001, 2004-2006, 2009-2018 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/>.

   From Paul Eggert and Jim Meyering.  */

#ifndef _DOSNAME_H

#define _DOSNAME_H

#if (defined _WIN32 || defined __WIN32__ ||     \

     defined __MSDOS__ || defined __CYGWIN__ || \

     defined __EMX__ || defined __DJGPP__)

   /* This internal macro assumes ASCII, but all hosts that support drive

      letters use ASCII.  */

# define _IS_DRIVE_LETTER(C) (((unsigned int) (C) | ('a' - 'A')) - 'a'  \

                              <= 'z' - 'a')

# define FILE_SYSTEM_PREFIX_LEN(Filename) \

          (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)

# ifndef __CYGWIN__

#  define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1

# endif

# define ISSLASH(C) ((C) == '/' || (C) == '\\')

#else

# define FILE_SYSTEM_PREFIX_LEN(Filename) 0

# define ISSLASH(C) ((C) == '/')

#endif

#ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE

# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0

#endif

#if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE

#  define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])

# else

#  define IS_ABSOLUTE_FILE_NAME(F)                              \

     (ISSLASH ((F)[0]) || FILE_SYSTEM_PREFIX_LEN (F) != 0)

#endif

#define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))

#endif /* DOSNAME_H_ */