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47f43160 | 1 | /* Basic filename support macros. |
581c785b | 2 | Copyright (C) 2001-2022 Free Software Foundation, Inc. |
47f43160 AZ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library 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 GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* From Paul Eggert and Jim Meyering. */ | |
20 | ||
21 | #ifndef _FILENAME_H | |
22 | #define _FILENAME_H | |
23 | ||
24 | #include <string.h> | |
25 | ||
26 | #ifdef __cplusplus | |
27 | extern "C" { | |
28 | #endif | |
29 | ||
30 | ||
31 | /* Filename support. | |
32 | ISSLASH(C) tests whether C is a directory separator | |
33 | character. | |
34 | HAS_DEVICE(Filename) tests whether Filename contains a device | |
35 | specification. | |
36 | FILE_SYSTEM_PREFIX_LEN(Filename) length of the device specification | |
37 | at the beginning of Filename, | |
38 | index of the part consisting of | |
39 | alternating components and slashes. | |
40 | FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE | |
41 | 1 when a non-empty device specification | |
42 | can be followed by an empty or relative | |
43 | part, | |
44 | 0 when a non-empty device specification | |
45 | must be followed by a slash, | |
46 | 0 when device specification don't exist. | |
47 | IS_ABSOLUTE_FILE_NAME(Filename) | |
48 | tests whether Filename is independent of | |
49 | any notion of "current directory". | |
50 | IS_RELATIVE_FILE_NAME(Filename) | |
51 | tests whether Filename may be concatenated | |
52 | to a directory filename. | |
53 | Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a | |
54 | relative file name! | |
55 | IS_FILE_NAME_WITH_DIR(Filename) tests whether Filename contains a device | |
56 | or directory specification. | |
57 | */ | |
58 | #if defined _WIN32 || defined __CYGWIN__ \ | |
59 | || defined __EMX__ || defined __MSDOS__ || defined __DJGPP__ | |
60 | /* Native Windows, Cygwin, OS/2, DOS */ | |
61 | # define ISSLASH(C) ((C) == '/' || (C) == '\\') | |
62 | /* Internal macro: Tests whether a character is a drive letter. */ | |
63 | # define _IS_DRIVE_LETTER(C) \ | |
64 | (((C) >= 'A' && (C) <= 'Z') || ((C) >= 'a' && (C) <= 'z')) | |
65 | /* Help the compiler optimizing it. This assumes ASCII. */ | |
66 | # undef _IS_DRIVE_LETTER | |
67 | # define _IS_DRIVE_LETTER(C) \ | |
68 | (((unsigned int) (C) | ('a' - 'A')) - 'a' <= 'z' - 'a') | |
69 | # define HAS_DEVICE(Filename) \ | |
70 | (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':') | |
71 | # define FILE_SYSTEM_PREFIX_LEN(Filename) (HAS_DEVICE (Filename) ? 2 : 0) | |
72 | # ifdef __CYGWIN__ | |
73 | # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0 | |
74 | # else | |
75 | /* On native Windows, OS/2, DOS, the system has the notion of a | |
76 | "current directory" on each drive. */ | |
77 | # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1 | |
78 | # endif | |
79 | # if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE | |
80 | # define IS_ABSOLUTE_FILE_NAME(Filename) \ | |
81 | ISSLASH ((Filename)[FILE_SYSTEM_PREFIX_LEN (Filename)]) | |
82 | # else | |
83 | # define IS_ABSOLUTE_FILE_NAME(Filename) \ | |
84 | (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename)) | |
85 | # endif | |
86 | # define IS_RELATIVE_FILE_NAME(Filename) \ | |
87 | (! (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename))) | |
88 | # define IS_FILE_NAME_WITH_DIR(Filename) \ | |
89 | (strchr ((Filename), '/') != NULL || strchr ((Filename), '\\') != NULL \ | |
90 | || HAS_DEVICE (Filename)) | |
91 | #else | |
92 | /* Unix */ | |
93 | # define ISSLASH(C) ((C) == '/') | |
94 | # define HAS_DEVICE(Filename) ((void) (Filename), 0) | |
95 | # define FILE_SYSTEM_PREFIX_LEN(Filename) ((void) (Filename), 0) | |
96 | # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0 | |
97 | # define IS_ABSOLUTE_FILE_NAME(Filename) ISSLASH ((Filename)[0]) | |
98 | # define IS_RELATIVE_FILE_NAME(Filename) (! ISSLASH ((Filename)[0])) | |
99 | # define IS_FILE_NAME_WITH_DIR(Filename) (strchr ((Filename), '/') != NULL) | |
100 | #endif | |
101 | ||
102 | /* Deprecated macros. For backward compatibility with old users of the | |
103 | 'filename' module. */ | |
104 | #define IS_ABSOLUTE_PATH IS_ABSOLUTE_FILE_NAME | |
105 | #define IS_PATH_WITH_DIR IS_FILE_NAME_WITH_DIR | |
106 | ||
107 | ||
108 | #ifdef __cplusplus | |
109 | } | |
110 | #endif | |
111 | ||
112 | #endif /* _FILENAME_H */ |