65 строки
1.6 KiB
C
65 строки
1.6 KiB
C
|
/*
|
||
|
|
* Helpers for formatting and printing strings
|
||
|
|
*
|
||
|
|
* Copyright 31 August 2008 James Bottomley
|
||
|
|
*/
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/math64.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/string_helpers.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* string_get_size - get the size in the specified units
|
||
|
|
* @size: The size to be converted
|
||
|
|
* @units: units to use (powers of 1000 or 1024)
|
||
|
|
* @buf: buffer to format to
|
||
|
|
* @len: length of buffer
|
||
|
|
*
|
||
|
|
* This function returns a string formatted to 3 significant figures
|
||
|
|
* giving the size in the required units. Returns 0 on success or
|
||
|
|
* error on failure. @buf is always zero terminated.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int string_get_size(u64 size, const enum string_size_units units,
|
||
|
|
char *buf, int len)
|
||
|
|
{
|
||
|
|
const char *units_10[] = { "B", "KB", "MB", "GB", "TB", "PB",
|
||
|
|
"EB", "ZB", "YB", NULL};
|
||
|
|
const char *units_2[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB",
|
||
|
|
"EiB", "ZiB", "YiB", NULL };
|
||
|
|
const char **units_str[] = {
|
||
|
|
[STRING_UNITS_10] = units_10,
|
||
|
|
[STRING_UNITS_2] = units_2,
|
||
|
|
};
|
||
|
|
const int divisor[] = {
|
||
|
|
[STRING_UNITS_10] = 1000,
|
||
|
|
[STRING_UNITS_2] = 1024,
|
||
|
|
};
|
||
|
|
int i, j;
|
||
|
|
u64 remainder = 0, sf_cap;
|
||
|
|
char tmp[8];
|
||
|
|
|
||
|
|
tmp[0] = '\0';
|
||
|
|
|
||
|
|
for (i = 0; size > divisor[units] && units_str[units][i]; i++)
|
||
|
|
remainder = do_div(size, divisor[units]);
|
||
|
|
|
||
|
|
sf_cap = size;
|
||
|
|
for (j = 0; sf_cap*10 < 1000; j++)
|
||
|
|
sf_cap *= 10;
|
||
|
|
|
||
|
|
if (j) {
|
||
|
|
remainder *= 1000;
|
||
|
|
do_div(remainder, divisor[units]);
|
||
|
|
snprintf(tmp, sizeof(tmp), ".%03lld",
|
||
|
|
(unsigned long long)remainder);
|
||
|
|
tmp[j+1] = '\0';
|
||
|
|
}
|
||
|
|
|
||
|
|
snprintf(buf, len, "%lld%s%s", (unsigned long long)size,
|
||
|
|
tmp, units_str[units][i]);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(string_get_size);
|