mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 08:04:13 +08:00
a8659597bf
We would hang forever when passing a zero to string_get_size(). Furthermore, string_get_size() would produce decimals on a value small enough to be exact. Finally, a few formatting issues are inconsistent with standard SI style guidelines. - If the value is less than the divisor, skip the entire rounding step. This prints out all small values including zero as integers, without decimals. - Add a space between the value and the symbol for the unit, consistent with standard SI practice. - Lower case k in kB since we are talking about powers of 10. - Finally, change "int" to "unsigned int" in one place to shut up a gcc warning when compiling the code out-of-kernel for testing. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
69 lines
1.7 KiB
C
69 lines
1.7 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 unsigned int divisor[] = {
|
|
[STRING_UNITS_10] = 1000,
|
|
[STRING_UNITS_2] = 1024,
|
|
};
|
|
int i, j;
|
|
u64 remainder = 0, sf_cap;
|
|
char tmp[8];
|
|
|
|
tmp[0] = '\0';
|
|
i = 0;
|
|
if (size >= divisor[units]) {
|
|
while (size >= divisor[units] && units_str[units][i]) {
|
|
remainder = do_div(size, divisor[units]);
|
|
i++;
|
|
}
|
|
|
|
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);
|