-/* fsusage.c -- return space usage of mounted filesystems
- Copyright (C) 1991, 1992, 1996, 1998 Free Software Foundation, Inc.
+/* fsusage.c -- return space usage of mounted file systems
+
+ Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003, 2004, 2005
+ 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
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#if HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
+#if HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#include <unistd.h>
+#ifndef UINTMAX_MAX
+# define UINTMAX_MAX ((uintmax_t) -1)
+#endif
+
#include <sys/types.h>
#include <sys/stat.h>
#include "fsusage.h"
-int statfs ();
+#include <limits.h>
#if HAVE_SYS_PARAM_H
# include <sys/param.h>
# include <sys/fs/s5param.h>
#endif
-#if defined (HAVE_SYS_FILSYS_H) && !defined (_CRAY)
+#if defined HAVE_SYS_FILSYS_H && !defined _CRAY
# include <sys/filsys.h> /* SVR2 */
#endif
-#if HAVE_FCNTL_H
-# include <fcntl.h>
-#endif
+#include <fcntl.h>
#if HAVE_SYS_STATFS_H
# include <sys/statfs.h>
#if HAVE_SYS_STATVFS_H /* SVR4 */
# include <sys/statvfs.h>
-int statvfs ();
#endif
+#include "full-read.h"
+
/* 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 unitmax_t. */
-#define PROPAGATE_ALL_ONES(x) ((x) == -1 ? (uintmax_t) -1 : (uintmax_t) (x))
-
-int safe_read ();
+ a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
+ is unsigned and narrower than uintmax_t. */
+#define PROPAGATE_ALL_ONES(x) \
+ ((sizeof (x) < sizeof (uintmax_t) \
+ && (~ (x) == (sizeof (x) < sizeof (int) \
+ ? - (1 << (sizeof (x) * CHAR_BIT)) \
+ : 0))) \
+ ? UINTMAX_MAX : (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))
/* Fill in the fields of FSP with information about space usage for
- the filesystem on which PATH resides.
- DISK is the device on which PATH is mounted, for space-getting
+ the file system on which FILE resides.
+ DISK is the device on which FILE is mounted, for space-getting
methods that need to know it.
Return 0 if successful, -1 if not. When returning -1, ensure that
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 (char const *file, char const *disk, struct fs_usage *fsp)
{
#ifdef STAT_STATFS3_OSF1
struct statfs fsd;
- if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
+ if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
return -1;
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
struct fs_data fsd;
- if (statfs (path, &fsd) != 1)
+ if (statfs (file, &fsd) != 1)
return -1;
fsp->fsu_blocksize = 1024;
fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
- fsp->fsu_bavail = PROPAGATE_ALL_ONES (fsd.fd_req.bfreen);
+ 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);
if (fd < 0)
return -1;
lseek (fd, (off_t) SUPERBOFF, 0);
- if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
+ if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
{
close (fd);
return -1;
}
close (fd);
- fsp->fsu_blocksize = fsd.s_type == Fs2b ? 1024 : 512;
+ 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_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
+ ? UINTMAX_MAX
: (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
struct statfs fsd;
- if (statfs (path, &fsd) < 0)
+ if (statfs (file, &fsd) < 0)
return -1;
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
truncation, presumably without botching the 4.1.1 case, in which
the values are not truncated. The correct counts are stored in
undocumented spare fields. */
- if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0)
+ if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
{
fsd.f_blocks = fsd.f_spare[0];
fsd.f_bfree = fsd.f_spare[1];
struct statfs fsd;
- if (statfs (path, &fsd) < 0)
+ if (statfs (file, &fsd) < 0)
return -1;
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
struct statfs fsd;
- if (statfs (path, &fsd, sizeof fsd, 0) < 0)
+ if (statfs (file, &fsd, sizeof fsd, 0) < 0)
return -1;
/* Empirically, the block counts on most SVR3 and SVR3-derived
systems seem to always be in terms of 512-byte blocks,
no matter what value f_bsize has. */
-# if _AIX || defined(_CRAY)
+# if _AIX || defined _CRAY
fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
# else
fsp->fsu_blocksize = 512;
struct statvfs fsd;
- if (statvfs (path, &fsd) < 0)
+ if (statvfs (file, &fsd) < 0)
return -1;
/* f_frsize isn't guaranteed to be supported. */
- fsp->fsu_blocksize =
- PROPAGATE_ALL_ONES (fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize);
+ fsp->fsu_blocksize = (fsd.f_frsize
+ ? PROPAGATE_ALL_ONES (fsd.f_frsize)
+ : PROPAGATE_ALL_ONES (fsd.f_bsize));
#endif /* STAT_STATVFS */
-#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS)
+#if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
/* !Ultrix && !SVR2 */
fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
- fsp->fsu_bavail = PROPAGATE_ALL_ONES (fsd.f_bavail);
+ 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);
return 0;
}
-#if defined(_AIX) && defined(_I386)
+#if defined _AIX && defined _I386
/* AIX PS/2 does not supply statfs. */
int
-statfs (path, fsb)
- char *path;
- struct statfs *fsb;
+statfs (char *file, struct statfs *fsb)
{
struct stat stats;
struct dustat fsd;
- if (stat (path, &stats))
+ if (stat (file, &stats) != 0)
return -1;
if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
return -1;
projects / gnulib.git / blobdiff