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  
parse_tag_value(const char * str,struct parse_tag * tags)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  
convert_unit_double(double value,char * unit)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  
convert_unit(unsigned long value,char * unit)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  
unit_number__scnprintf(char * buf,size_t size,u64 n)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