/* * Helpers for formatting and printing strings * * Copyright 31 August 2008 James Bottomley */#include <linux/kernel.h>#include <linux/math64.h>#include <linux/export.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);