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1  /* File names on MS-DOS/Windows systems.
2  
3     Copyright (C) 2000-2001, 2004-2006, 2009-2012 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_ */
54