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/* Determine whether two stat buffers are known to refer to the same file.
Copyright (C) 2006, 2009-2024 Free Software Foundation, Inc.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef SAME_INODE_H
#define SAME_INODE_H 1
/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE. */
#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
#include <sys/stat.h>
_GL_INLINE_HEADER_BEGIN
#ifndef SAME_INODE_INLINE
# define SAME_INODE_INLINE _GL_INLINE
#endif
/* True if A and B point to structs with st_dev and st_ino members
that are known to represent the same file.
Use | and ^ to shorten generated code, and to lessen the
probability of screwups if st_ino is an array. */
#if defined __VMS && __CRTL_VER < 80200000
# define PSAME_INODE(a, b) (! (((a)->st_dev ^ (b)->st_dev) \
| ((a)->st_ino[0] ^ (b)->st_ino[0]) \
| ((a)->st_ino[1] ^ (b)->st_ino[1]) \
| ((a)->st_ino[2] ^ (b)->st_ino[2])))
#elif defined _WIN32 && ! defined __CYGWIN__
/* Native Windows. */
# if _GL_WINDOWS_STAT_INODES
/* stat() and fstat() set st_dev and st_ino to 0 if information about
the inode is not available. */
# if _GL_WINDOWS_STAT_INODES == 2
# define PSAME_INODE(a, b) \
(! (! ((a)->st_dev | (a)->st_ino._gl_ino[0] | (a)->st_ino._gl_ino[1]) \
| ((a)->st_dev ^ (b)->st_dev) \
| ((a)->st_ino._gl_ino[0] ^ (b)->st_ino._gl_ino[0]) \
| ((a)->st_ino._gl_ino[1] ^ (b)->st_ino._gl_ino[1])))
# else
# define PSAME_INODE(a, b) (! (! ((a)->st_dev | (a)->st_ino) \
| ((a)->st_dev ^ (b)->st_dev) \
| ((a)->st_ino ^ (b)->st_ino)))
# endif
# else
/* stat() and fstat() set st_ino to 0 always. */
# define PSAME_INODE(a, b) 0
# endif
#else
/* POSIX. */
# define PSAME_INODE(a, b) (! (((a)->st_dev ^ (b)->st_dev) \
| ((a)->st_ino ^ (b)->st_ino)))
#endif
/* True if struct objects A and B are known to represent the same file. */
#define SAME_INODE(a, b) PSAME_INODE (&(a), &(b))
/* True if *A and *B represent the same file. Unlike PSAME_INODE,
args are evaluated once and must point to struct stat. */
SAME_INODE_INLINE bool
psame_inode (struct stat const *a, struct stat const *b)
{
return PSAME_INODE (a, b);
}
_GL_INLINE_HEADER_END
#endif
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