77 lines · c
1// SPDX-License-Identifier: GPL-2.02#include "units.h"3#include <inttypes.h>4#include <limits.h>5#include <stdlib.h>6#include <string.h>7#include <linux/kernel.h>8#include <linux/time64.h>9 10unsigned long parse_tag_value(const char *str, struct parse_tag *tags)11{12 struct parse_tag *i = tags;13 14 while (i->tag) {15 char *s = strchr(str, i->tag);16 17 if (s) {18 unsigned long int value;19 char *endptr;20 21 value = strtoul(str, &endptr, 10);22 if (s != endptr)23 break;24 25 if (value > ULONG_MAX / i->mult)26 break;27 value *= i->mult;28 return value;29 }30 i++;31 }32 33 return (unsigned long) -1;34}35 36double convert_unit_double(double value, char *unit)37{38 *unit = ' ';39 40 if (value > 1000.0) {41 value /= 1000.0;42 *unit = 'K';43 }44 45 if (value > 1000.0) {46 value /= 1000.0;47 *unit = 'M';48 }49 50 if (value > 1000.0) {51 value /= 1000.0;52 *unit = 'G';53 }54 55 return value;56}57 58unsigned long convert_unit(unsigned long value, char *unit)59{60 double v = convert_unit_double((double)value, unit);61 62 return (unsigned long)v;63}64 65int unit_number__scnprintf(char *buf, size_t size, u64 n)66{67 char unit[4] = "BKMG";68 int i = 0;69 70 while (((n / 1024) > 1) && (i < 3)) {71 n /= 1024;72 i++;73 }74 75 return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);76}77