code.delx.au - gnu-emacs/blob - lib/dosname.h

   1 /* File names on MS-DOS/Windows systems.
   2
   3    Copyright (C) 2000-2001, 2004-2006, 2009-2015 Free Software
   4    Foundation, Inc.
   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 3 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, see <http://www.gnu.org/licenses/>.
  18
  19    From Paul Eggert and Jim Meyering.  */
  20
  21 #ifndef _DOSNAME_H
  22 #define _DOSNAME_H
  23
  24 #if (defined _WIN32 || defined __WIN32__ ||     \
  25      defined __MSDOS__ || defined __CYGWIN__ || \
  26      defined __EMX__ || defined __DJGPP__)
  27    /* This internal macro assumes ASCII, but all hosts that support drive
  28       letters use ASCII.  */
  29 # define _IS_DRIVE_LETTER(C) (((unsigned int) (C) | ('a' - 'A')) - 'a'  \
  30                               <= 'z' - 'a')
  31 # define FILE_SYSTEM_PREFIX_LEN(Filename) \
  32           (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
  33 # ifndef __CYGWIN__
  34 #  define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
  35 # endif
  36 # define ISSLASH(C) ((C) == '/' || (C) == '\\')
  37 #else
  38 # define FILE_SYSTEM_PREFIX_LEN(Filename) 0
  39 # define ISSLASH(C) ((C) == '/')
  40 #endif
  41
  42 #ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
  43 # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
  44 #endif
  45
  46 #if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
  47 #  define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])
  48 # else
  49 #  define IS_ABSOLUTE_FILE_NAME(F)                              \
  50      (ISSLASH ((F)[0]) || FILE_SYSTEM_PREFIX_LEN (F) != 0)
  51 #endif
  52 #define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))
  53
  54 #endif /* DOSNAME_H_ */