xref: /onnv-gate/usr/src/lib/libast/common/port/iblocks.c (revision 4887:feebf9260c2e)
1*4887Schin /***********************************************************************
2*4887Schin *                                                                      *
3*4887Schin *               This software is part of the ast package               *
4*4887Schin *           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
5*4887Schin *                      and is licensed under the                       *
6*4887Schin *                  Common Public License, Version 1.0                  *
7*4887Schin *                      by AT&T Knowledge Ventures                      *
8*4887Schin *                                                                      *
9*4887Schin *                A copy of the License is available at                 *
10*4887Schin *            http://www.opensource.org/licenses/cpl1.0.txt             *
11*4887Schin *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*4887Schin *                                                                      *
13*4887Schin *              Information and Software Systems Research               *
14*4887Schin *                            AT&T Research                             *
15*4887Schin *                           Florham Park NJ                            *
16*4887Schin *                                                                      *
17*4887Schin *                 Glenn Fowler <gsf@research.att.com>                  *
18*4887Schin *                  David Korn <dgk@research.att.com>                   *
19*4887Schin *                   Phong Vo <kpv@research.att.com>                    *
20*4887Schin *                                                                      *
21*4887Schin ***********************************************************************/
22*4887Schin #pragma prototyped
23*4887Schin /*
24*4887Schin  * aux function for <ls.h> iblocks() macro
25*4887Schin  *
26*4887Schin  * return number of blocks, including indirect block count
27*4887Schin  * given stat info
28*4887Schin  *
29*4887Schin  * mail gsf@research.att.com when you figure out the stat.st_blocks units
30*4887Schin  * until then we assume LS_BLOCKSIZE (512)
31*4887Schin  */
32*4887Schin 
33*4887Schin #include <ast.h>
34*4887Schin #if _AIX /* XXX */
35*4887Schin #undef	major
36*4887Schin #undef	minor
37*4887Schin #undef	makedev
38*4887Schin #endif
39*4887Schin #include <ast_param.h>
40*4887Schin #include <ls.h>
41*4887Schin 
42*4887Schin #if !_mem_st_blocks_stat
43*4887Schin 
44*4887Schin #ifndef B_DIRECT
45*4887Schin #define B_DIRECT	10
46*4887Schin #endif
47*4887Schin 
48*4887Schin #ifdef BITFS
49*4887Schin 
50*4887Schin #define B_SIZE		BSIZE(st->st_dev)
51*4887Schin #define B_INDIRECT	NINDIR(st->st_dev)
52*4887Schin 
53*4887Schin #else
54*4887Schin 
55*4887Schin #ifdef BSIZE
56*4887Schin #define B_SIZE		BSIZE
57*4887Schin #else
58*4887Schin #define B_SIZE		1024
59*4887Schin #endif
60*4887Schin 
61*4887Schin #ifdef NINDIR
62*4887Schin #define B_INDIRECT	NINDIR
63*4887Schin #else
64*4887Schin #define B_INDIRECT	128
65*4887Schin #endif
66*4887Schin 
67*4887Schin #endif
68*4887Schin 
69*4887Schin #endif
70*4887Schin 
71*4887Schin off_t
72*4887Schin _iblocks(register struct stat* st)
73*4887Schin {
74*4887Schin #if _mem_st_blocks_stat
75*4887Schin 
76*4887Schin 	return (st->st_blocks <= 0 || st->st_size <= 0) ? 0 : st->st_blocks;
77*4887Schin 
78*4887Schin #else
79*4887Schin 	unsigned long	b;
80*4887Schin 	unsigned long	t;
81*4887Schin 
82*4887Schin 	t = b = (st->st_size + B_SIZE - 1) / B_SIZE;
83*4887Schin 	if ((b -= B_DIRECT) > 0)
84*4887Schin 	{
85*4887Schin 		t += (b - 1) / B_INDIRECT + 1;
86*4887Schin 		if ((b -= B_INDIRECT) > 0)
87*4887Schin 		{
88*4887Schin 			t += (b - 1) / (B_INDIRECT * B_INDIRECT) + 1;
89*4887Schin 			if (b > B_INDIRECT * B_INDIRECT)
90*4887Schin 				t++;
91*4887Schin 		}
92*4887Schin 	}
93*4887Schin 	return t * B_SIZE / LS_BLOCKSIZE;
94*4887Schin #endif
95*4887Schin }
96