mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 02:03:35 +08:00
113 lines
4.6 KiB
C
113 lines
4.6 KiB
C
|
/* 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 Lesser General Public
|
||
|
|
License as published by the Free Software Foundation; either
|
||
|
|
version 2.1 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
|
||
|
|
Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser 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 */
|