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113 lines
4.6 KiB
C
113 lines
4.6 KiB
C
/* Basic filename support macros.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* From Paul Eggert and Jim Meyering. */
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#ifndef _FILENAME_H
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#define _FILENAME_H
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#include <string.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Filename support.
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ISSLASH(C) tests whether C is a directory separator
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character.
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HAS_DEVICE(Filename) tests whether Filename contains a device
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specification.
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FILE_SYSTEM_PREFIX_LEN(Filename) length of the device specification
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at the beginning of Filename,
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index of the part consisting of
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alternating components and slashes.
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FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
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1 when a non-empty device specification
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can be followed by an empty or relative
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part,
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0 when a non-empty device specification
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must be followed by a slash,
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0 when device specification don't exist.
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IS_ABSOLUTE_FILE_NAME(Filename)
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tests whether Filename is independent of
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any notion of "current directory".
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IS_RELATIVE_FILE_NAME(Filename)
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tests whether Filename may be concatenated
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to a directory filename.
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Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a
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relative file name!
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IS_FILE_NAME_WITH_DIR(Filename) tests whether Filename contains a device
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or directory specification.
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*/
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#if defined _WIN32 || defined __CYGWIN__ \
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|| defined __EMX__ || defined __MSDOS__ || defined __DJGPP__
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/* Native Windows, Cygwin, OS/2, DOS */
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# define ISSLASH(C) ((C) == '/' || (C) == '\\')
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/* Internal macro: Tests whether a character is a drive letter. */
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# define _IS_DRIVE_LETTER(C) \
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(((C) >= 'A' && (C) <= 'Z') || ((C) >= 'a' && (C) <= 'z'))
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/* Help the compiler optimizing it. This assumes ASCII. */
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# undef _IS_DRIVE_LETTER
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# define _IS_DRIVE_LETTER(C) \
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(((unsigned int) (C) | ('a' - 'A')) - 'a' <= 'z' - 'a')
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# define HAS_DEVICE(Filename) \
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(_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':')
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# define FILE_SYSTEM_PREFIX_LEN(Filename) (HAS_DEVICE (Filename) ? 2 : 0)
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# ifdef __CYGWIN__
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# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
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# else
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/* On native Windows, OS/2, DOS, the system has the notion of a
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"current directory" on each drive. */
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# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1
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# endif
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# if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
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# define IS_ABSOLUTE_FILE_NAME(Filename) \
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ISSLASH ((Filename)[FILE_SYSTEM_PREFIX_LEN (Filename)])
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# else
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# define IS_ABSOLUTE_FILE_NAME(Filename) \
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(ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename))
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# endif
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# define IS_RELATIVE_FILE_NAME(Filename) \
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(! (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename)))
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# define IS_FILE_NAME_WITH_DIR(Filename) \
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(strchr ((Filename), '/') != NULL || strchr ((Filename), '\\') != NULL \
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|| HAS_DEVICE (Filename))
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#else
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/* Unix */
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# define ISSLASH(C) ((C) == '/')
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# define HAS_DEVICE(Filename) ((void) (Filename), 0)
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# define FILE_SYSTEM_PREFIX_LEN(Filename) ((void) (Filename), 0)
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# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
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# define IS_ABSOLUTE_FILE_NAME(Filename) ISSLASH ((Filename)[0])
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# define IS_RELATIVE_FILE_NAME(Filename) (! ISSLASH ((Filename)[0]))
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# define IS_FILE_NAME_WITH_DIR(Filename) (strchr ((Filename), '/') != NULL)
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#endif
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/* Deprecated macros. For backward compatibility with old users of the
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'filename' module. */
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#define IS_ABSOLUTE_PATH IS_ABSOLUTE_FILE_NAME
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#define IS_PATH_WITH_DIR IS_FILE_NAME_WITH_DIR
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FILENAME_H */
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