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