1 /* File names on MS-DOS/Windows systems. 2 3 Copyright (C) 2000-2001, 2004-2006, 2009-2020 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_ */ 53