1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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(void)
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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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