168 lines
3.1 KiB
C
168 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright 2014 PMC-Sierra, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/*
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*
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* Author: Logan Gunthorpe
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*
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* Date: Oct 23 2014
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*
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* Description:
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* Functions for dealing with number suffixes
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*
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*/
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#include "suffix.h"
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <math.h>
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static struct si_suffix {
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long double magnitude;
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const char *suffix;
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} si_suffixes[] = {
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{1e30, "Q"},
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{1e27, "R"},
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{1e24, "Y"},
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{1e21, "Z"},
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{1e18, "E"},
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{1e15, "P"},
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{1e12, "T"},
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{1e9, "G"},
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{1e6, "M"},
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{1e3, "k"},
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{1e0, ""},
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{0}
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};
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const char *suffix_si_get(double *value)
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{
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long double value_ld = *value;
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const char *suffix = suffix_si_get_ld(&value_ld);
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*value = value_ld;
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return suffix;
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}
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uint64_t suffix_si_parse(const char *value, bool *suffixed)
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{
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char *suffix;
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double ret;
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struct si_suffix *s;
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errno = 0;
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ret = strtod(value, &suffix);
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if (errno)
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return 0;
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for (s = si_suffixes; s->magnitude != 0; s++) {
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if (suffix[0] == s->suffix[0]) {
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if (suffixed && suffix[0] != '\0')
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*suffixed = true;
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return ret *= s->magnitude;
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}
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}
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if (suffix[0] != '\0')
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errno = EINVAL;
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return (uint64_t)ret;
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}
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const char *suffix_si_get_ld(long double *value)
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{
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struct si_suffix *s;
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for (s = si_suffixes; s->magnitude != 0; s++) {
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if (*value >= s->magnitude) {
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*value /= s->magnitude;
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return s->suffix;
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}
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}
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return "";
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}
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static struct binary_suffix {
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int shift;
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const char *suffix;
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} binary_suffixes[] = {
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{50, "Pi"},
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{40, "Ti"},
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{30, "Gi"},
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{20, "Mi"},
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{10, "Ki"},
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{0, ""}
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};
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const char *suffix_binary_get(long long *value)
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{
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struct binary_suffix *s;
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for (s = binary_suffixes; s->shift != 0; s++) {
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if (llabs(*value) >= (1LL << s->shift)) {
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*value =
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(*value + (1LL << (s->shift - 1))) / (1LL << s->shift);
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return s->suffix;
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}
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}
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return "";
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}
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const char *suffix_dbinary_get(double *value)
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{
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struct binary_suffix *s;
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for (s = binary_suffixes; s->shift != 0; s++) {
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if (fabs(*value) >= (1LL << s->shift)) {
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*value = *value / (1LL << s->shift);
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return s->suffix;
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}
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}
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return "";
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}
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uint64_t suffix_binary_parse(const char *value)
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{
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char *suffix;
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errno = 0;
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uint64_t ret = strtoull(value, &suffix, 0);
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if (errno)
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return 0;
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struct binary_suffix *s;
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for (s = binary_suffixes; s->shift != 0; s++) {
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if (tolower(suffix[0]) == tolower(s->suffix[0])) {
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ret <<= s->shift;
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return ret;
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}
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}
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if (suffix[0] != '\0')
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errno = EINVAL;
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return ret;
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}
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