386BSD 0.1 development

Work on file usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/fileblocks.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/fileblocks.c b/usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/fileblocks.c
new file mode 100644 (file)
index 0000000..44c8e02
--- /dev/null
+++ b/usr/othersrc/public/fileutils-3.2/fileutils-3.2/lib/fileblocks.c
@@ -0,0 +1,60 @@
+/* Convert file size to number of blocks on System V-like machines.
+   Copyright (C) 1990 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 2, 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Written by Brian L. Matthews, blm@6sceng.UUCP. */
+\f
+#if defined (ST_BLOCKS_MISSING) && !defined(_POSIX_SOURCE)
+#include <sys/types.h>
+#include <sys/param.h>
+
+#ifndef NINDIR
+/* Some SysV's, like Irix, seem to lack these.  Hope they're correct. */
+/* Size of a indirect block, in bytes. */
+#define BSIZE 1024
+
+/* 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. */
+
+long
+st_blocks (size)
+     long size;
+{
+  long datablks = (size + 512 - 1) / 512;
+  long 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;
+}
+#endif