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Initial revision

    1: /* File names on MS-DOS/Windows systems.
    2: 
    3:    Copyright (C) 2000-2001, 2004-2006, 2009-2011 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_ */