1 files changed, 74 insertions, 0 deletions
diff --git a/lib/fileblocks.c b/lib/fileblocks.c
new file mode 100644
index 0000000..213ba5a
--- /dev/null
+++ b/lib/fileblocks.c
@@ -0,0 +1,74 @@
+/* Convert file size to number of blocks on System V-like machines.
+
+   Copyright (C) 1990, 1997-1999, 2004-2006, 2009-2022 Free Software
+   Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Brian L. Matthews, blm@6sceng.UUCP. */
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+
+#if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE
+
+# include <unistd.h>
+
+# ifndef NINDIR
+
+#  if defined __DJGPP__
+typedef long daddr_t; /* for disk address */
+#  endif
+
+/* Some SysV's, like Irix, seem to lack this.  Hope it's correct. */
+/* Number of inode pointers per indirect block. */
+#  define NINDIR (BSIZE / sizeof (daddr_t))
+# endif /* !NINDIR */
+
+/* Number of direct block addresses in an inode. */
+# define NDIR   10
+
+/* Return the number of 512-byte blocks in a file of SIZE bytes. */
+
+off_t
+st_blocks (off_t size)
+{
+  off_t datablks = size / 512 + (size % 512 != 0);
+  off_t indrblks = 0;
+
+  if (datablks > NDIR)
+    {
+      indrblks = (datablks - NDIR - 1) / NINDIR + 1;
+
+      if (datablks > NDIR + NINDIR)
+        {
+          indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1;
+
+          if (datablks > NDIR + NINDIR + NINDIR * NINDIR)
+            indrblks++;
+        }
+    }
+
+  return datablks + indrblks;
+}
+#else
+/* This declaration is solely to ensure that after preprocessing
+   this file is never empty.  */
+typedef int textutils_fileblocks_unused;
+#endif