| 1 | /* Basic filename support macros.
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| 2 | Copyright (C) 2001-2004, 2007-2021 Free Software Foundation, Inc.
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| 3 | This file is part of the GNU C Library.
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| 4 |
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| 5 | The GNU C Library is free software; you can redistribute it and/or
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| 6 | modify it under the terms of the GNU Lesser General Public
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| 7 | License as published by the Free Software Foundation; either
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| 8 | version 2.1 of the License, or (at your option) any later version.
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| 9 |
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| 10 | The GNU C Library is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public
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| 16 | License along with the GNU C Library; if not, see
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| 17 | <https://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | /* From Paul Eggert and Jim Meyering. */
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| 20 |
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| 21 | #ifndef _FILENAME_H
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| 22 | #define _FILENAME_H
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| 23 |
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| 24 | #include <string.h>
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| 25 |
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| 26 | #ifdef __cplusplus
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| 27 | extern "C" {
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| 28 | #endif
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| 29 |
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| 30 |
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| 31 | /* Filename support.
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| 32 | ISSLASH(C) tests whether C is a directory separator
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| 33 | character.
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| 34 | HAS_DEVICE(Filename) tests whether Filename contains a device
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| 35 | specification.
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| 36 | FILE_SYSTEM_PREFIX_LEN(Filename) length of the device specification
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| 37 | at the beginning of Filename,
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| 38 | index of the part consisting of
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| 39 | alternating components and slashes.
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| 40 | FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
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| 41 | 1 when a non-empty device specification
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| 42 | can be followed by an empty or relative
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| 43 | part,
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| 44 | 0 when a non-empty device specification
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| 45 | must be followed by a slash,
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| 46 | 0 when device specification don't exist.
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| 47 | IS_ABSOLUTE_FILE_NAME(Filename)
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| 48 | tests whether Filename is independent of
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| 49 | any notion of "current directory".
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| 50 | IS_RELATIVE_FILE_NAME(Filename)
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| 51 | tests whether Filename may be concatenated
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| 52 | to a directory filename.
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| 53 | Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a
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| 54 | relative file name!
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| 55 | IS_FILE_NAME_WITH_DIR(Filename) tests whether Filename contains a device
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| 56 | or directory specification.
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| 57 | */
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| 58 | #if defined _WIN32 || defined __CYGWIN__ \
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| 59 | || defined __EMX__ || defined __MSDOS__ || defined __DJGPP__
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| 60 | /* Native Windows, Cygwin, OS/2, DOS */
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| 61 | # define ISSLASH(C) ((C) == '/' || (C) == '\\')
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| 62 | /* Internal macro: Tests whether a character is a drive letter. */
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| 63 | # define _IS_DRIVE_LETTER(C) \
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| 64 | (((C) >= 'A' && (C) <= 'Z') || ((C) >= 'a' && (C) <= 'z'))
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| 65 | /* Help the compiler optimizing it. This assumes ASCII. */
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| 66 | # undef _IS_DRIVE_LETTER
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| 67 | # define _IS_DRIVE_LETTER(C) \
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| 68 | (((unsigned int) (C) | ('a' - 'A')) - 'a' <= 'z' - 'a')
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| 69 | # define HAS_DEVICE(Filename) \
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| 70 | (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':')
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| 71 | # define FILE_SYSTEM_PREFIX_LEN(Filename) (HAS_DEVICE (Filename) ? 2 : 0)
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| 72 | # ifdef __CYGWIN__
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| 73 | # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
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| 74 | # else
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| 75 | /* On native Windows, OS/2, DOS, the system has the notion of a
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| 76 | "current directory" on each drive. */
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| 77 | # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
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| 78 | # endif
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| 79 | # if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
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| 80 | # define IS_ABSOLUTE_FILE_NAME(Filename) \
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| 81 | ISSLASH ((Filename)[FILE_SYSTEM_PREFIX_LEN (Filename)])
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| 82 | # else
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| 83 | # define IS_ABSOLUTE_FILE_NAME(Filename) \
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| 84 | (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename))
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| 85 | # endif
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| 86 | # define IS_RELATIVE_FILE_NAME(Filename) \
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| 87 | (! (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename)))
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| 88 | # define IS_FILE_NAME_WITH_DIR(Filename) \
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| 89 | (strchr ((Filename), '/') != NULL || strchr ((Filename), '\\') != NULL \
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| 90 | || HAS_DEVICE (Filename))
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| 91 | #else
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| 92 | /* Unix */
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| 93 | # define ISSLASH(C) ((C) == '/')
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| 94 | # define HAS_DEVICE(Filename) ((void) (Filename), 0)
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| 95 | # define FILE_SYSTEM_PREFIX_LEN(Filename) ((void) (Filename), 0)
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| 96 | # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
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| 97 | # define IS_ABSOLUTE_FILE_NAME(Filename) ISSLASH ((Filename)[0])
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| 98 | # define IS_RELATIVE_FILE_NAME(Filename) (! ISSLASH ((Filename)[0]))
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| 99 | # define IS_FILE_NAME_WITH_DIR(Filename) (strchr ((Filename), '/') != NULL)
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| 100 | #endif
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| 101 |
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| 102 | /* Deprecated macros. For backward compatibility with old users of the
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| 103 | 'filename' module. */
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| 104 | #define IS_ABSOLUTE_PATH IS_ABSOLUTE_FILE_NAME
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| 105 | #define IS_PATH_WITH_DIR IS_FILE_NAME_WITH_DIR
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| 106 |
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| 107 |
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| 108 | #ifdef __cplusplus
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| 109 | }
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| 110 | #endif
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| 111 |
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| 112 | #endif /* _FILENAME_H */
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