1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 /* 24 * aux function for <ls.h> iblocks() macro 25 * 26 * return number of blocks, including indirect block count 27 * given stat info 28 * 29 * mail gsf@research.att.com when you figure out the stat.st_blocks units 30 * until then we assume LS_BLOCKSIZE (512) 31 */ 32 33 #include <ast.h> 34 #if _AIX /* XXX */ 35 #undef major 36 #undef minor 37 #undef makedev 38 #endif 39 #include <ast_param.h> 40 #include <ls.h> 41 42 #if !_mem_st_blocks_stat 43 44 #ifndef B_DIRECT 45 #define B_DIRECT 10 46 #endif 47 48 #ifdef BITFS 49 50 #define B_SIZE BSIZE(st->st_dev) 51 #define B_INDIRECT NINDIR(st->st_dev) 52 53 #else 54 55 #ifdef BSIZE 56 #define B_SIZE BSIZE 57 #else 58 #define B_SIZE 1024 59 #endif 60 61 #ifdef NINDIR 62 #define B_INDIRECT NINDIR 63 #else 64 #define B_INDIRECT 128 65 #endif 66 67 #endif 68 69 #endif 70 71 off_t 72 _iblocks(register struct stat* st) 73 { 74 #if _mem_st_blocks_stat 75 76 return (st->st_blocks <= 0 || st->st_size <= 0) ? 0 : st->st_blocks; 77 78 #else 79 unsigned long b; 80 unsigned long t; 81 82 t = b = (st->st_size + B_SIZE - 1) / B_SIZE; 83 if ((b -= B_DIRECT) > 0) 84 { 85 t += (b - 1) / B_INDIRECT + 1; 86 if ((b -= B_INDIRECT) > 0) 87 { 88 t += (b - 1) / (B_INDIRECT * B_INDIRECT) + 1; 89 if (b > B_INDIRECT * B_INDIRECT) 90 t++; 91 } 92 } 93 return t * B_SIZE / LS_BLOCKSIZE; 94 #endif 95 } 96