/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>

/*
 * return a pointer to a string containing the size
 *"as xxx KiB", "xxx.y KiB", "xxx MiB", "xxx.y MiB",
 * xxx GiB, xxx.y GiB, etc as needed;
 */
char *size_human_readable(unsigned long long size)
{
	static char buf[20];
	unsigned long m = 0, n;
	unsigned long long f;
	static const char names[] = {'E', 'P', 'T', 'G', 'M', 'K'};
	unsigned long d = 10 * ARRAY_SIZE(names);
	char c = 0;
	unsigned int i;
	char *ptr = buf;

	for (i = 0; i < ARRAY_SIZE(names); i++, d -= 10) {
		if (size >> d) {
			c = names[i];
			break;
		}
	}

	if (!c) {
		sprintf(buf, "%llu Bytes", size);
		return buf;
	}

	n = size >> d;
	f = size & ((1ULL << d) - 1);

	/* If there's a remainder, deal with it */
	if (f) {
		m = (10ULL * f + (1ULL << (d - 1))) >> d;

		if (m >= 10) {
			m -= 10;
			n += 1;
		}
	}

	ptr += sprintf(buf, "%lu", n);
	if (m) {
		ptr += sprintf(ptr, ".%lu", m);
	}
	sprintf(ptr, " %ciB", c);

	return buf;
}
EXPORT_SYMBOL(size_human_readable);