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
10 unsigned 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
36 double 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
58 unsigned 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
65 int 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
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