2 * Copyright (c) 2003, Trent Nelson, <trent@arpa.com>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/types.h>
35 struct convtbl convtbl[] = {
37 { BYTE, BYTES, "bytes" }, /* SC_BYTE (0) */
38 { BYTE, KILO, "KB" }, /* SC_KILOBYTE (1) */
39 { BYTE, MEGA, "MB" }, /* SC_MEGABYTE (2) */
40 { BYTE, GIGA, "GB" }, /* SC_GIGABYTE (3) */
42 { BIT, BITS, "b" }, /* SC_BITS (4) */
43 { BIT, KILO, "Kb" }, /* SC_KILOBITS (5) */
44 { BIT, MEGA, "Mb" }, /* SC_MEGABITS (6) */
45 { BIT, GIGA, "Gb" }, /* SC_GIGABITS (7) */
47 { 0, 0, "" } /* SC_AUTO (8) */
54 get_tbl_ptr(const u_long size, const u_int scale)
56 struct convtbl *tbl_ptr = NULL;
60 /* If our index is out of range, default to auto-scaling. */
66 * Simple but elegant algorithm. Count how many times
67 * we can shift our size value right by a factor of ten,
68 * incrementing an index each time. We then use the
69 * index as the array index into the conversion table.
71 for (tmp = size, idx = SC_KILOBYTE;
72 tmp >= MEGA && idx <= SC_GIGABYTE;
75 tbl_ptr = &convtbl[idx];
80 convert(const u_long size, const u_int scale)
82 struct convtbl *tp = NULL;
84 tp = get_tbl_ptr(size, scale);
86 return ((double)size * tp->mul / tp->scale);
91 get_string(const u_long size, const u_int scale)
93 struct convtbl *tp = NULL;
95 tp = get_tbl_ptr(size, scale);