2 * Helpers for formatting and printing strings
4 * Copyright 31 August 2008 James Bottomley
6 #include <linux/kernel.h>
7 #include <linux/math64.h>
8 #include <linux/module.h>
9 #include <linux/string_helpers.h>
12 * string_get_size - get the size in the specified units
13 * @size: The size to be converted
14 * @units: units to use (powers of 1000 or 1024)
15 * @buf: buffer to format to
16 * @len: length of buffer
18 * This function returns a string formatted to 3 significant figures
19 * giving the size in the required units. Returns 0 on success or
20 * error on failure. @buf is always zero terminated.
23 int string_get_size(u64 size
, const enum string_size_units units
,
26 const char *units_10
[] = { "B", "kB", "MB", "GB", "TB", "PB",
27 "EB", "ZB", "YB", NULL
};
28 const char *units_2
[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB",
29 "EiB", "ZiB", "YiB", NULL
};
30 const char **units_str
[] = {
31 [STRING_UNITS_10
] = units_10
,
32 [STRING_UNITS_2
] = units_2
,
34 const unsigned int divisor
[] = {
35 [STRING_UNITS_10
] = 1000,
36 [STRING_UNITS_2
] = 1024,
39 u64 remainder
= 0, sf_cap
;
44 if (size
>= divisor
[units
]) {
45 while (size
>= divisor
[units
] && units_str
[units
][i
]) {
46 remainder
= do_div(size
, divisor
[units
]);
51 for (j
= 0; sf_cap
*10 < 1000; j
++)
56 do_div(remainder
, divisor
[units
]);
57 snprintf(tmp
, sizeof(tmp
), ".%03lld",
58 (unsigned long long)remainder
);
63 snprintf(buf
, len
, "%lld%s %s", (unsigned long long)size
,
64 tmp
, units_str
[units
][i
]);
68 EXPORT_SYMBOL(string_get_size
);
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