Mercurial > hg > octave-shane > gnulib-hg
annotate lib/stat-size.h @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
| author | Eric Blake <eblake@redhat.com> |
|---|---|
| date | Tue, 01 Jan 2013 00:50:58 +0000 |
| parents | 82db61e229ef |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
| 14902 | 1 /* macros useful in interpreting size-related values in struct stat. |
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maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
parents:
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2 Copyright (C) 1989, 1991-2013 Free Software Foundation, Inc. |
| 14902 | 3 |
| 4 This program is free software: you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation, either version 3 of the License, or | |
| 7 (at your option) any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 16 /* | |
| 17 Macros defined by this file (s is an rvalue of type struct stat): | |
| 18 | |
| 19 DEV_BSIZE: The device blocksize. But use ST_NBLOCKSIZE instead. | |
| 20 ST_BLKSIZE(s): Preferred (in the sense of best performance) I/O blocksize | |
| 21 for the file, in bytes. | |
| 22 ST_NBLOCKS(s): Number of blocks in the file, including indirect blocks. | |
| 23 ST_NBLOCKSIZE: Size of blocks used when calculating ST_NBLOCKS. | |
| 24 */ | |
| 25 #ifndef STAT_SIZE_H | |
| 26 #define STAT_SIZE_H | |
| 27 | |
| 28 /* sys/param.h may define DEV_BSIZE */ | |
| 29 #if HAVE_SYS_PARAM_H | |
| 30 # include <sys/param.h> | |
| 31 #endif | |
| 32 | |
| 33 | |
| 34 /* Get or fake the disk device blocksize. | |
| 35 Usually defined by sys/param.h (if at all). */ | |
| 36 #if !defined DEV_BSIZE && defined BSIZE | |
| 37 # define DEV_BSIZE BSIZE | |
| 38 #endif | |
| 39 #if !defined DEV_BSIZE && defined BBSIZE /* SGI sys/param.h */ | |
| 40 # define DEV_BSIZE BBSIZE | |
| 41 #endif | |
| 42 #ifndef DEV_BSIZE | |
| 43 # define DEV_BSIZE 4096 | |
| 44 #endif | |
| 45 | |
| 46 | |
| 47 | |
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Paul Eggert <eggert@cs.ucla.edu>
parents:
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48 /* Extract or fake data from a 'struct stat'. |
| 14902 | 49 ST_BLKSIZE: Preferred I/O blocksize for the file, in bytes. |
| 50 ST_NBLOCKS: Number of blocks in the file, including indirect blocks. | |
| 51 ST_NBLOCKSIZE: Size of blocks used when calculating ST_NBLOCKS. */ | |
| 52 #ifndef HAVE_STRUCT_STAT_ST_BLOCKS | |
| 53 # define ST_BLKSIZE(statbuf) DEV_BSIZE | |
| 54 /* coreutils' fileblocks.c also uses BSIZE. */ | |
| 55 # if defined _POSIX_SOURCE || !defined BSIZE | |
| 56 # define ST_NBLOCKS(statbuf) \ | |
| 57 ((statbuf).st_size / ST_NBLOCKSIZE + ((statbuf).st_size % ST_NBLOCKSIZE != 0)) | |
| 58 # else | |
| 59 /* This definition calls st_blocks, which is in the fileblocks module. */ | |
| 60 # define ST_NBLOCKS(statbuf) \ | |
| 61 (S_ISREG ((statbuf).st_mode) || S_ISDIR ((statbuf).st_mode) ? \ | |
| 62 st_blocks ((statbuf).st_size) : 0) | |
| 63 # endif | |
| 64 #else | |
| 65 /* Some systems, like Sequents, return st_blksize of 0 on pipes. | |
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Paul Eggert <eggert@cs.ucla.edu>
parents:
16201
diff
changeset
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66 Also, when running 'rsh hpux11-system cat any-file', cat would |
| 14902 | 67 determine that the output stream had an st_blksize of 2147421096. |
| 68 Conversely st_blksize can be 2 GiB (or maybe even larger) with XFS | |
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16235
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In commentary, do not use ` to quote.
Paul Eggert <eggert@cs.ucla.edu>
parents:
16201
diff
changeset
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69 on 64-bit hosts. Somewhat arbitrarily, limit the "optimal" block |
| 14902 | 70 size to SIZE_MAX / 8 + 1. (Dividing SIZE_MAX by only 4 wouldn't |
| 71 suffice, since "cat" sometimes multiplies the result by 4.) If | |
| 72 anyone knows of a system for which this limit is too small, please | |
| 73 report it as a bug in this code. */ | |
| 74 # define ST_BLKSIZE(statbuf) ((0 < (statbuf).st_blksize \ | |
| 75 && (statbuf).st_blksize <= ((size_t)-1) / 8 + 1) \ | |
| 76 ? (statbuf).st_blksize : DEV_BSIZE) | |
| 77 # if defined hpux || defined __hpux__ || defined __hpux | |
| 78 /* HP-UX counts st_blocks in 1024-byte units. | |
| 79 This loses when mixing HP-UX and BSD file systems with NFS. */ | |
| 80 # define ST_NBLOCKSIZE 1024 | |
| 81 # else /* !hpux */ | |
| 82 # if defined _AIX && defined _I386 | |
| 83 /* AIX PS/2 counts st_blocks in 4K units. */ | |
| 84 # define ST_NBLOCKSIZE (4 * 1024) | |
| 85 # else | |
| 86 # if defined _CRAY | |
| 87 # define ST_NBLOCKS(statbuf) \ | |
| 88 (S_ISREG ((statbuf).st_mode) || S_ISDIR ((statbuf).st_mode) \ | |
| 89 ? (statbuf).st_blocks * ST_BLKSIZE (statbuf) / ST_NBLOCKSIZE : 0) | |
| 90 # endif | |
| 91 # endif | |
| 92 # endif | |
| 93 #endif | |
| 94 | |
| 95 #ifndef ST_NBLOCKS | |
| 96 # define ST_NBLOCKS(statbuf) ((statbuf).st_blocks) | |
| 97 #endif | |
| 98 | |
| 99 #ifndef ST_NBLOCKSIZE | |
| 100 # ifdef S_BLKSIZE | |
| 101 # define ST_NBLOCKSIZE S_BLKSIZE | |
| 102 # else | |
| 103 # define ST_NBLOCKSIZE 512 | |
| 104 # endif | |
| 105 #endif | |
| 106 | |
| 107 #endif /* STAT_SIZE_H */ |