// SPDX-License-Identifier: GPL-2.0
#include "units.h"
#include <inttypes.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <linux/kernel.h>
#include <linux/time64.h>

unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
{
        struct parse_tag *i = tags;

        while (i->tag) {
                const char *s = strchr(str, i->tag);

                if (s) {
                        unsigned long int value;
                        char *endptr;

                        value = strtoul(str, &endptr, 10);
                        if (s != endptr)
                                break;

                        if (value > ULONG_MAX / i->mult)
                                break;
                        value *= i->mult;
                        return value;
                }
                i++;
        }

        return (unsigned long) -1;
}

double convert_unit_double(double value, char *unit)
{
        *unit = ' ';

        if (value > 1000.0) {
                value /= 1000.0;
                *unit = 'K';
        }

        if (value > 1000.0) {
                value /= 1000.0;
                *unit = 'M';
        }

        if (value > 1000.0) {
                value /= 1000.0;
                *unit = 'G';
        }

        return value;
}

unsigned long convert_unit(unsigned long value, char *unit)
{
        double v = convert_unit_double((double)value, unit);

        return (unsigned long)v;
}

int unit_number__scnprintf(char *buf, size_t size, u64 n)
{
        char unit[] = "BKMG";
        int i = 0;

        while (((n / 1024) > 1) && (i < 3)) {
                n /= 1024;
                i++;
        }

        return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);
}