151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/*
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* Copyright (c) 2003, Trent Nelson, <trent@arpa.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include "convtbl.h"
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#define BIT (8)
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#define BITS (1)
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#define KILOBIT (1000LL)
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#define MEGABIT (KILOBIT * 1000)
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#define GIGABIT (MEGABIT * 1000)
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#define TERABIT (GIGABIT * 1000)
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#define BYTE (1)
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#define BYTES (1)
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#define KILOBYTE (1024LL)
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#define MEGABYTE (KILOBYTE * 1024)
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#define GIGABYTE (MEGABYTE * 1024)
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#define TERABYTE (GIGABYTE * 1024)
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struct convtbl {
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uintmax_t mul;
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uintmax_t scale;
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const char *str;
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const char *name;
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};
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static struct convtbl convtbl[] = {
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/* mul, scale, str, name */
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[SC_BYTE] = { BYTE, BYTES, "B", "byte" },
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[SC_KILOBYTE] = { BYTE, KILOBYTE, "KB", "kbyte" },
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[SC_MEGABYTE] = { BYTE, MEGABYTE, "MB", "mbyte" },
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[SC_GIGABYTE] = { BYTE, GIGABYTE, "GB", "gbyte" },
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[SC_TERABYTE] = { BYTE, TERABYTE, "TB", "tbyte" },
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[SC_BIT] = { BIT, BITS, "b", "bit" },
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[SC_KILOBIT] = { BIT, KILOBIT, "Kb", "kbit" },
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[SC_MEGABIT] = { BIT, MEGABIT, "Mb", "mbit" },
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[SC_GIGABIT] = { BIT, GIGABIT, "Gb", "gbit" },
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[SC_TERABIT] = { BIT, TERABIT, "Tb", "tbit" },
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[SC_AUTO] = { 0, 0, "", "auto" }
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};
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static
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struct convtbl *
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get_tbl_ptr(const uintmax_t size, const int scale)
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{
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uintmax_t tmp;
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int idx;
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/* If our index is out of range, default to auto-scaling. */
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idx = scale < SC_AUTO ? scale : SC_AUTO;
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if (idx == SC_AUTO)
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/*
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* Simple but elegant algorithm. Count how many times
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* we can shift our size value right by a factor of ten,
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* incrementing an index each time. We then use the
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* index as the array index into the conversion table.
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*/
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for (tmp = size, idx = SC_KILOBYTE;
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tmp >= MEGABYTE && idx < SC_BIT - 1;
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tmp >>= 10, idx++);
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return (&convtbl[idx]);
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}
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double
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convert(const uintmax_t size, const int scale)
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{
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struct convtbl *tp;
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tp = get_tbl_ptr(size, scale);
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return ((double)size * tp->mul / tp->scale);
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}
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const char *
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get_string(const uintmax_t size, const int scale)
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{
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struct convtbl *tp;
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tp = get_tbl_ptr(size, scale);
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return (tp->str);
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}
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int
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get_scale(const char *name)
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{
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int i;
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for (i = 0; i <= SC_AUTO; i++)
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if (strcmp(convtbl[i].name, name) == 0)
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return (i);
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return (-1);
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}
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const char *
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get_helplist()
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{
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int i;
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size_t len;
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static char *buf;
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if (buf == NULL) {
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len = 0;
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for (i = 0; i <= SC_AUTO; i++)
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len += strlen(convtbl[i].name) + 2;
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if ((buf = malloc(len)) != NULL) {
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buf[0] = '\0';
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for (i = 0; i <= SC_AUTO; i++) {
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strcat(buf, convtbl[i].name);
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if (i < SC_AUTO)
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strcat(buf, ", ");
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}
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} else
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return ("");
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}
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return (buf);
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}
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