gnulib/import/dosname.h

   1 /* File names on MS-DOS/Windows systems.
   2
   3    Copyright (C) 2000-2001, 2004-2006, 2009-2019 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 <https://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 __CYGWIN__ \
  24      || defined __EMX__ || defined __MSDOS__ || defined __DJGPP__)
  25    /* This internal macro assumes ASCII, but all hosts that support drive
  26       letters use ASCII.  */
  27 # define _IS_DRIVE_LETTER(C) (((unsigned int) (C) | ('a' - 'A')) - 'a'  \
  28                               <= 'z' - 'a')
  29 # define FILE_SYSTEM_PREFIX_LEN(Filename) \
  30           (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
  31 # ifndef __CYGWIN__
  32 #  define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
  33 # endif
  34 # define ISSLASH(C) ((C) == '/' || (C) == '\\')
  35 #else
  36 # define FILE_SYSTEM_PREFIX_LEN(Filename) 0
  37 # define ISSLASH(C) ((C) == '/')
  38 #endif
  39
  40 #ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
  41 # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
  42 #endif
  43
  44 #if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
  45 #  define IS_ABSOLUTE_FILE_NAME(F) ISSLASH ((F)[FILE_SYSTEM_PREFIX_LEN (F)])
  46 # else
  47 #  define IS_ABSOLUTE_FILE_NAME(F)                              \
  48      (ISSLASH ((F)[0]) || FILE_SYSTEM_PREFIX_LEN (F) != 0)
  49 #endif
  50 #define IS_RELATIVE_FILE_NAME(F) (! IS_ABSOLUTE_FILE_NAME (F))
  51
  52 #endif /* DOSNAME_H_ */