diff options
Diffstat (limited to 'lib/fileblocks.c')
-rw-r--r-- | lib/fileblocks.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/lib/fileblocks.c b/lib/fileblocks.c new file mode 100644 index 00000000..83ac04fd --- /dev/null +++ b/lib/fileblocks.c @@ -0,0 +1,66 @@ +/* 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. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#if !defined (HAVE_ST_BLOCKS) && !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. */ +#ifndef BSIZE +#define BSIZE 1024 +#endif + +/* 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 |