mirror of
https://github.com/MidnightCommander/mc
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c5c561274b
Sync with gnulib dea936112710e82dd42ffbea510f3bb644acdaaa. Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/* macros useful in interpreting size-related values in struct stat.
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Copyright (C) 1989, 1991-2016 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* *INDENT-OFF* */
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/*
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Macros defined by this file (s is an rvalue of type struct stat):
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DEV_BSIZE: The device blocksize. But use ST_NBLOCKSIZE instead.
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ST_BLKSIZE(s): Preferred (in the sense of best performance) I/O blocksize
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for the file, in bytes.
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ST_NBLOCKS(s): Number of blocks in the file, including indirect blocks.
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ST_NBLOCKSIZE: Size of blocks used when calculating ST_NBLOCKS.
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*/
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/* *INDENT-ON* */
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#ifndef STAT_SIZE_H
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#define STAT_SIZE_H
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/* sys/param.h may define DEV_BSIZE */
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#if HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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/* Get or fake the disk device blocksize.
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Usually defined by sys/param.h (if at all). */
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#if !defined DEV_BSIZE && defined BSIZE
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#define DEV_BSIZE BSIZE
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#endif
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#if !defined DEV_BSIZE && defined BBSIZE /* SGI sys/param.h */
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#define DEV_BSIZE BBSIZE
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#endif
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#ifndef DEV_BSIZE
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#define DEV_BSIZE 4096
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#endif
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/* Extract or fake data from a 'struct stat'.
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ST_BLKSIZE: Preferred I/O blocksize for the file, in bytes.
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ST_NBLOCKS: Number of blocks in the file, including indirect blocks.
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ST_NBLOCKSIZE: Size of blocks used when calculating ST_NBLOCKS. */
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#ifndef HAVE_STRUCT_STAT_ST_BLOCKS
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#define ST_BLKSIZE(statbuf) DEV_BSIZE
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/* coreutils' fileblocks.c also uses BSIZE. */
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#if defined _POSIX_SOURCE || !defined BSIZE
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#define ST_NBLOCKS(statbuf) \
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((statbuf).st_size / ST_NBLOCKSIZE + ((statbuf).st_size % ST_NBLOCKSIZE != 0))
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#else
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/* This definition calls st_blocks, which is in the fileblocks module. */
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#define ST_NBLOCKS(statbuf) \
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(S_ISREG ((statbuf).st_mode) || S_ISDIR ((statbuf).st_mode) ? \
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st_blocks ((statbuf).st_size) : 0)
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#endif
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#else
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/* When running 'rsh hpux11-system cat any-file', cat would
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determine that the output stream had an st_blksize of 2147421096.
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Conversely st_blksize can be 2 GiB (or maybe even larger) with XFS
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on 64-bit hosts. Somewhat arbitrarily, limit the "optimal" block
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size to SIZE_MAX / 8 + 1. (Dividing SIZE_MAX by only 4 wouldn't
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suffice, since "cat" sometimes multiplies the result by 4.) If
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anyone knows of a system for which this limit is too small, please
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report it as a bug in this code. */
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#define ST_BLKSIZE(statbuf) ((0 < (statbuf).st_blksize \
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&& (size_t) ((statbuf).st_blksize) <= ((size_t)-1) / 8 + 1) \
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? (size_t) ((statbuf).st_blksize) : DEV_BSIZE)
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#if defined hpux || defined __hpux__ || defined __hpux
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/* HP-UX counts st_blocks in 1024-byte units.
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This loses when mixing HP-UX and BSD file systems with NFS. */
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#define ST_NBLOCKSIZE 1024
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#endif
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#endif
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#ifndef ST_NBLOCKS
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#define ST_NBLOCKS(statbuf) ((statbuf).st_blocks)
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#endif
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#ifndef ST_NBLOCKSIZE
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#ifdef S_BLKSIZE
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#define ST_NBLOCKSIZE S_BLKSIZE
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#else
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#define ST_NBLOCKSIZE 512
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#endif
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#endif
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#endif /* STAT_SIZE_H */
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