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| author | Jim Meyering <jim@meyering.net> | 2002-09-26 08:18:33 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 2002-09-26 08:18:33 +0000 |
| commit | 4b0eb25d6dbfa53393c7bfaac582672159d997d8 (patch) | |
| tree | bcc246f5e5514261677ed7294050eafe3101c6c4 /lib/fsusage.c | |
| parent | 9cc87603b91b03285f859c2a9828b4bf7682299f (diff) | |
| download | coreutils-4b0eb25d6dbfa53393c7bfaac582672159d997d8.tar.xz | |
[! HAVE_INTTYPES_H && HAVE_STDINT_H] Include <stdint.h>.
(UINTMAX_MAX) [!defined UINTMAX_MAX]: New macro.
(PROPAGATE_ALL_ONES): Work even if X is unsigned and narrower than
int. Work more efficiently if X is the same width as uintmax_t.
Do not compare X to -1, to avoid bogus compiler warning.
(get_fs_usage): (uintmax_t) -1 -> UINTMAX_MAX to avoid a cast.
Don't assume that f_frsize and f_bsize are the same type.
Diffstat (limited to 'lib/fsusage.c')
| -rw-r--r-- | lib/fsusage.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/lib/fsusage.c b/lib/fsusage.c index fac5d9f17..ae101e991 100644 --- a/lib/fsusage.c +++ b/lib/fsusage.c @@ -22,7 +22,15 @@ #if HAVE_INTTYPES_H # include <inttypes.h> +#else +# if HAVE_STDINT_H +# include <stdint.h> +# endif +#endif +#ifndef UINTMAX_MAX +# define UINTMAX_MAX ((uintmax_t) -1) #endif + #include <sys/types.h> #include <sys/stat.h> #include "fsusage.h" @@ -75,9 +83,14 @@ int statvfs (); /* 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)) + 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) \ @@ -163,7 +176,7 @@ get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp) 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); @@ -236,8 +249,9 @@ get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp) 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 */ |