1// SPDX-License-Identifier: GPL-2.0
 2#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
36unsigned long convert_unit(unsigned long value, char *unit)
37{
38	*unit = ' ';
39
40	if (value > 1000) {
41		value /= 1000;
42		*unit = 'K';
43	}
44
45	if (value > 1000) {
46		value /= 1000;
47		*unit = 'M';
48	}
49
50	if (value > 1000) {
51		value /= 1000;
52		*unit = 'G';
53	}
54
55	return value;
56}
57
58int unit_number__scnprintf(char *buf, size_t size, u64 n)
59{
60	char unit[4] = "BKMG";
61	int i = 0;
62
63	while (((n / 1024) > 1) && (i < 3)) {
64		n /= 1024;
65		i++;
66	}
67
68	return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);
69}