| /* Basic filename support macros. |
| Copyright (C) 2001-2004, 2007-2021 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public |
| License as published by the Free Software Foundation; either |
| version 3 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public |
| License along with the GNU C Library; if not, see |
| <https://www.gnu.org/licenses/>. */ |
| |
| /* From Paul Eggert and Jim Meyering. */ |
| |
| #ifndef _FILENAME_H |
| #define _FILENAME_H |
| |
| #include <string.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /* Filename support. |
| ISSLASH(C) tests whether C is a directory separator |
| character. |
| HAS_DEVICE(Filename) tests whether Filename contains a device |
| specification. |
| FILE_SYSTEM_PREFIX_LEN(Filename) length of the device specification |
| at the beginning of Filename, |
| index of the part consisting of |
| alternating components and slashes. |
| FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE |
| 1 when a non-empty device specification |
| can be followed by an empty or relative |
| part, |
| 0 when a non-empty device specification |
| must be followed by a slash, |
| 0 when device specification don't exist. |
| IS_ABSOLUTE_FILE_NAME(Filename) |
| tests whether Filename is independent of |
| any notion of "current directory". |
| IS_RELATIVE_FILE_NAME(Filename) |
| tests whether Filename may be concatenated |
| to a directory filename. |
| Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a |
| relative file name! |
| IS_FILE_NAME_WITH_DIR(Filename) tests whether Filename contains a device |
| or directory specification. |
| */ |
| #if defined _WIN32 || defined __CYGWIN__ \ |
| || defined __EMX__ || defined __MSDOS__ || defined __DJGPP__ |
| /* Native Windows, Cygwin, OS/2, DOS */ |
| # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| /* Internal macro: Tests whether a character is a drive letter. */ |
| # define _IS_DRIVE_LETTER(C) \ |
| (((C) >= 'A' && (C) <= 'Z') || ((C) >= 'a' && (C) <= 'z')) |
| /* Help the compiler optimizing it. This assumes ASCII. */ |
| # undef _IS_DRIVE_LETTER |
| # define _IS_DRIVE_LETTER(C) \ |
| (((unsigned int) (C) | ('a' - 'A')) - 'a' <= 'z' - 'a') |
| # define HAS_DEVICE(Filename) \ |
| (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':') |
| # define FILE_SYSTEM_PREFIX_LEN(Filename) (HAS_DEVICE (Filename) ? 2 : 0) |
| # ifdef __CYGWIN__ |
| # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0 |
| # else |
| /* On native Windows, OS/2, DOS, the system has the notion of a |
| "current directory" on each drive. */ |
| # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1 |
| # endif |
| # if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE |
| # define IS_ABSOLUTE_FILE_NAME(Filename) \ |
| ISSLASH ((Filename)[FILE_SYSTEM_PREFIX_LEN (Filename)]) |
| # else |
| # define IS_ABSOLUTE_FILE_NAME(Filename) \ |
| (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename)) |
| # endif |
| # define IS_RELATIVE_FILE_NAME(Filename) \ |
| (! (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename))) |
| # define IS_FILE_NAME_WITH_DIR(Filename) \ |
| (strchr ((Filename), '/') != NULL || strchr ((Filename), '\\') != NULL \ |
| || HAS_DEVICE (Filename)) |
| #else |
| /* Unix */ |
| # define ISSLASH(C) ((C) == '/') |
| # define HAS_DEVICE(Filename) ((void) (Filename), 0) |
| # define FILE_SYSTEM_PREFIX_LEN(Filename) ((void) (Filename), 0) |
| # define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0 |
| # define IS_ABSOLUTE_FILE_NAME(Filename) ISSLASH ((Filename)[0]) |
| # define IS_RELATIVE_FILE_NAME(Filename) (! ISSLASH ((Filename)[0])) |
| # define IS_FILE_NAME_WITH_DIR(Filename) (strchr ((Filename), '/') != NULL) |
| #endif |
| |
| /* Deprecated macros. For backward compatibility with old users of the |
| 'filename' module. */ |
| #define IS_ABSOLUTE_PATH IS_ABSOLUTE_FILE_NAME |
| #define IS_PATH_WITH_DIR IS_FILE_NAME_WITH_DIR |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _FILENAME_H */ |