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-rw-r--r--lib/same-inode.h86
1 files changed, 62 insertions, 24 deletions
diff --git a/lib/same-inode.h b/lib/same-inode.h
index 10964f0..62dd088 100644
--- a/lib/same-inode.h
+++ b/lib/same-inode.h
@@ -1,6 +1,6 @@
/* Determine whether two stat buffers are known to refer to the same file.
- Copyright (C) 2006, 2009-2023 Free Software Foundation, Inc.
+ 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
@@ -16,32 +16,70 @@
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef SAME_INODE_H
-# define SAME_INODE_H 1
-
-# include <sys/types.h>
-
-# if defined __VMS && __CRTL_VER < 80200000
-# define SAME_INODE(a, b) \
- ((a).st_ino[0] == (b).st_ino[0] \
- && (a).st_ino[1] == (b).st_ino[1] \
- && (a).st_ino[2] == (b).st_ino[2] \
- && (a).st_dev == (b).st_dev)
-# 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. */
-# define SAME_INODE(a, b) \
- (!((a).st_ino == 0 && (a).st_dev == 0) \
- && (a).st_ino == (b).st_ino && (a).st_dev == (b).st_dev)
+#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
- /* stat() and fstat() set st_ino to 0 always. */
-# define SAME_INODE(a, b) 0
+# 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
-# define SAME_INODE(a, b) \
- ((a).st_ino == (b).st_ino \
- && (a).st_dev == (b).st_dev)
+ /* 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