lib/dosname.h

   1 /* File names on MS-DOS/Windows systems.
   2
   3    Copyright (C) 2000-2001, 2004-2006, 2009-2017 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18    From Paul Eggert and Jim Meyering.  */
  19
  20 #ifndef _DOSNAME_H
  21 #define _DOSNAME_H
  22
  23 #if (defined _WIN32 || defined __WIN32__ ||     \
  24      defined __MSDOS__ || defined __CYGWIN__ || \
  25      defined __EMX__ || defined __DJGPP__)
  26    /* This internal macro assumes ASCII, but all hosts that support drive
  27       letters use ASCII.  */
  28 # define _IS_DRIVE_LETTER(C) (((unsigned int) (C) | ('a' - 'A')) - 'a'  \
  29                               <= 'z' - 'a')
  30 # define FILE_SYSTEM_PREFIX_LEN(Filename) \
  31           (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
  32 # ifndef __CYGWIN__
  33 #  define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
  34 # endif
  35 # define ISSLASH(C) ((C) == '/' || (C) == '\\')
  36 #else
  37 # define FILE_SYSTEM_PREFIX_LEN(Filename) 0
  38 # define ISSLASH(C) ((C) == '/')
  39 #endif
  40
  41 #ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
  42 # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
  43 #endif
  44
  45 #if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
  46 #  define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])
  47 # else
  48 #  define IS_ABSOLUTE_FILE_NAME(F)                              \
  49      (ISSLASH ((F)[0]) || FILE_SYSTEM_PREFIX_LEN (F) != 0)
  50 #endif
  51 #define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))
  52
  53 #endif /* DOSNAME_H_ */