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