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/* macros useful in interpreting size-related values in struct stat.
Copyright (C) 1989, 1991-2021 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
/*
Macros defined by this file (s is an rvalue of type struct stat):
DEV_BSIZE: The device blocksize. But use ST_NBLOCKSIZE instead.
ST_BLKSIZE(s): Preferred (in the sense of best performance) I/O blocksize
for the file, in bytes.
ST_NBLOCKS(s): Number of blocks in the file, including indirect blocks.
ST_NBLOCKSIZE: Size of blocks used when calculating ST_NBLOCKS.
*/
#ifndef STAT_SIZE_H
#define STAT_SIZE_H
/* sys/param.h may define DEV_BSIZE */
#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
/* Get or fake the disk device blocksize.
Usually defined by sys/param.h (if at all). */
#if !defined DEV_BSIZE && defined BSIZE
# define DEV_BSIZE BSIZE
#endif
#if !defined DEV_BSIZE && defined BBSIZE /* SGI sys/param.h */
# define DEV_BSIZE BBSIZE
#endif
#ifndef DEV_BSIZE
# define DEV_BSIZE 4096
#endif
/* Extract or fake data from a 'struct stat'.
ST_BLKSIZE: Preferred I/O blocksize for the file, in bytes.
ST_NBLOCKS: Number of blocks in the file, including indirect blocks.
ST_NBLOCKSIZE: Size of blocks used when calculating ST_NBLOCKS. */
#ifndef HAVE_STRUCT_STAT_ST_BLOCKS
# define ST_BLKSIZE(statbuf) DEV_BSIZE
/* coreutils' fileblocks.c also uses BSIZE. */
# if defined _POSIX_SOURCE || !defined BSIZE
# define ST_NBLOCKS(statbuf) \
((statbuf).st_size / ST_NBLOCKSIZE + ((statbuf).st_size % ST_NBLOCKSIZE != 0))
# else
/* This definition calls st_blocks, which is in the fileblocks module. */
# define ST_NBLOCKS(statbuf) \
(S_ISREG ((statbuf).st_mode) || S_ISDIR ((statbuf).st_mode) ? \
st_blocks ((statbuf).st_size) : 0)
# endif
#else
/* When running 'rsh hpux11-system cat any-file', cat would
determine that the output stream had an st_blksize of 2147421096.
Conversely st_blksize can be 2 GiB (or maybe even larger) with XFS
on 64-bit hosts. Somewhat arbitrarily, limit the "optimal" block
size to SIZE_MAX / 8 + 1. (Dividing SIZE_MAX by only 4 wouldn't
suffice, since "cat" sometimes multiplies the result by 4.) If
anyone knows of a system for which this limit is too small, please
report it as a bug in this code. */
# define ST_BLKSIZE(statbuf) ((0 < (statbuf).st_blksize \
&& (statbuf).st_blksize <= ((size_t)-1) / 8 + 1) \
? (statbuf).st_blksize : DEV_BSIZE)
# if defined hpux || defined __hpux__ || defined __hpux
/* HP-UX counts st_blocks in 1024-byte units.
This loses when mixing HP-UX and BSD file systems with NFS. */
# define ST_NBLOCKSIZE 1024
# endif
#endif
#ifndef ST_NBLOCKS
# define ST_NBLOCKS(statbuf) ((statbuf).st_blocks)
#endif
#ifndef ST_NBLOCKSIZE
# ifdef S_BLKSIZE
# define ST_NBLOCKSIZE S_BLKSIZE
# else
# define ST_NBLOCKSIZE 512
# endif
#endif
#endif /* STAT_SIZE_H */
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