| /* Convert file size to number of blocks on System V-like machines. |
| |
| Copyright (C) 1990, 1997-1999, 2004-2006, 2009-2020 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/>. */ |
| |
| /* Written by Brian L. Matthews, blm@6sceng.UUCP. */ |
| |
| #include <config.h> |
| |
| #include <sys/types.h> |
| |
| #if HAVE_SYS_PARAM_H |
| # include <sys/param.h> |
| #endif |
| |
| #if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE |
| |
| # include <unistd.h> |
| |
| # ifndef NINDIR |
| |
| # if defined __DJGPP__ |
| typedef long daddr_t; /* for disk address */ |
| # endif |
| |
| /* Some SysV's, like Irix, seem to lack this. Hope it's correct. */ |
| /* Number of inode pointers per indirect block. */ |
| # define NINDIR (BSIZE / sizeof (daddr_t)) |
| # endif /* !NINDIR */ |
| |
| /* Number of direct block addresses in an inode. */ |
| # define NDIR 10 |
| |
| /* Return the number of 512-byte blocks in a file of SIZE bytes. */ |
| |
| off_t |
| st_blocks (off_t size) |
| { |
| off_t datablks = size / 512 + (size % 512 != 0); |
| off_t indrblks = 0; |
| |
| if (datablks > NDIR) |
| { |
| indrblks = (datablks - NDIR - 1) / NINDIR + 1; |
| |
| if (datablks > NDIR + NINDIR) |
| { |
| indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1; |
| |
| if (datablks > NDIR + NINDIR + NINDIR * NINDIR) |
| indrblks++; |
| } |
| } |
| |
| return datablks + indrblks; |
| } |
| #else |
| /* This declaration is solely to ensure that after preprocessing |
| this file is never empty. */ |
| typedef int textutils_fileblocks_unused; |
| #endif |