/* fsusage.c -- return space usage of mounted filesystems
- Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1991, 1992, 1996, 1998 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
#include <sys/stat.h>
#include "fsusage.h"
+#if HAVE_LIMITS_H
+# include <limits.h>
+#endif
+#ifndef CHAR_BIT
+# define CHAR_BIT 8
+#endif
+
int statfs ();
#if HAVE_SYS_PARAM_H
int statvfs ();
#endif
+/* Many space usage primitives use all 1 bits to denote a value that is
+ not applicable or unknown. Propagate this information by returning
+ a uintmax_t value that is all 1 bits if the argument is all 1 bits,
+ even if the argument is unsigned and smaller than uintmax_t. */
+#define PROPAGATE_ALL_ONES(x) ((x) == -1 ? (uintmax_t) -1 : (uintmax_t) (x))
+
+/* Extract the top bit of X as an uintmax_t value. */
+#define EXTRACT_TOP_BIT(x) ((x) \
+ & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
+
+/* If a value is negative, many space usage primitives store it into an
+ integer variable by assignment, even if the variable's type is unsigned.
+ So, if a space usage variable X's top bit is set, convert X to the
+ uintmax_t value V such that (- (uintmax_t) V) is the negative of
+ the original value. If X's top bit is clear, just yield X.
+ Use PROPAGATE_TOP_BIT if the original value might be negative;
+ otherwise, use PROPAGATE_ALL_ONES. */
+#define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
+
int safe_read ();
/* Fill in the fields of FSP with information about space usage for
ERRNO is either a system error value, or zero if DISK is NULL
on a system that requires a non-NULL value. */
int
-get_fs_usage (path, disk, fsp)
- const char *path;
- const char *disk;
- struct fs_usage *fsp;
+get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
{
#ifdef STAT_STATFS3_OSF1
if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
return -1;
- fsp->fsu_blocksize = fsd.f_fsize;
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
#endif /* STAT_STATFS3_OSF1 */
return -1;
fsp->fsu_blocksize = 1024;
- fsp->fsu_blocks = fsd.fd_req.btot;
- fsp->fsu_bfree = fsd.fd_req.bfree;
- fsp->fsu_bavail = fsd.fd_req.bfreen;
- fsp->fsu_files = fsd.fd_req.gtot;
- fsp->fsu_ffree = fsd.fd_req.gfree;
+ fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
+ fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
+ fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
+ fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
+ fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
+ fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
#endif /* STAT_STATFS2_FS_DATA */
}
close (fd);
- fsp->fsu_blocksize = fsd.s_type == Fs2b ? 1024 : 512;
- fsp->fsu_blocks = fsd.s_fsize;
- fsp->fsu_bfree = fsd.s_tfree;
- fsp->fsu_bavail = fsd.s_tfree;
- fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1);
- fsp->fsu_ffree = fsd.s_tinode;
+ fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
+ fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
+ fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
+ fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
+ fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
+ fsp->fsu_files = (fsd.s_isize == -1
+ ? (uintmax_t) -1
+ : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
+ fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
#endif /* STAT_READ_FILSYS */
if (statfs (path, &fsd) < 0)
return -1;
- fsp->fsu_blocksize = fsd.f_bsize;
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
# ifdef STATFS_TRUNCATES_BLOCK_COUNTS
if (statfs (path, &fsd) < 0)
return -1;
- fsp->fsu_blocksize = fsd.f_fsize;
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
#endif /* STAT_STATFS2_FSIZE */
systems seem to always be in terms of 512-byte blocks,
no matter what value f_bsize has. */
# if _AIX || defined(_CRAY)
- fsp->fsu_blocksize = fsd.f_bsize;
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
# else
fsp->fsu_blocksize = 512;
# endif
return -1;
/* f_frsize isn't guaranteed to be supported. */
- fsp->fsu_blocksize = fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize;
+ fsp->fsu_blocksize =
+ PROPAGATE_ALL_ONES (fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize);
#endif /* STAT_STATVFS */
#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)
/* !Ultrix && !SVR2 */
- fsp->fsu_blocks = fsd.f_blocks;
- fsp->fsu_bfree = fsd.f_bfree;
- fsp->fsu_bavail = fsd.f_bavail;
- fsp->fsu_files = fsd.f_files;
- fsp->fsu_ffree = fsd.f_ffree;
+ fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
+ fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
+ fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
+ fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
+ fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
+ fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
#endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
/* AIX PS/2 does not supply statfs. */
int
-statfs (path, fsb)
- char *path;
- struct statfs *fsb;
+statfs (char *path, struct statfs *fsb)
{
struct stat stats;
struct dustat fsd;
projects / gnulib.git / blobdiff