-/* vi: set sw=4 ts=4: */
/*
- * Utility routines.
+ * June 30, 2001 Manuel Novoa III
*
- * Copyright (C) tons of folks. Tracking down who wrote what
- * isn't something I'm going to worry about... If you wrote something
- * here, please feel free to acknowledge your work.
+ * All-integer version (hey, not everyone has floating point) of
+ * make_human_readable_str, modified from similar code I had written
+ * for busybox several months ago.
*
- * 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.
+ * Notes:
+ * 1) I'm using an unsigned long long to hold the product size * block_size,
+ * as df (which calls this routine) could request a representation of a
+ * partition size in bytes > max of unsigned long. If long longs aren't
+ * available, it would be possible to do what's needed using polynomial
+ * representations (say, powers of 1024) and manipulating coefficients.
+ * The base ten "bytes" output could be handled similarly.
*
- * 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.
+ * 2) This routine always outputs a decimal point and a tenths digit when
+ * display_unit != 0. Hence, it isn't uncommon for the returned string
+ * to have a length of 5 or 6.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
- * Permission has been granted to redistribute this code under the GPL.
+ * It might be nice to add a flag to indicate no decimal digits in
+ * that case. This could be either an additional parameter, or a
+ * special value of display_unit. Such a flag would also be nice for du.
*
+ * Some code to omit the decimal point and tenths digit is sketched out
+ * and "#if 0"'d below.
*/
#include <stdio.h>
#include "libbb.h"
-static char buffer[10];
-static const char *suffixes[] = { "", "k", "M", "G", "T" };
-
-const char *make_human_readable_str(unsigned long val, unsigned long hr)
+const char *make_human_readable_str(unsigned long long size,
+ unsigned long block_size, unsigned long display_unit)
{
- int suffix, base;
-
- for (suffix = 0, base = 1; suffix < 5; suffix++, base <<= 10) {
- if (val < (base << 10)) {
- if (suffix && val < 10 * base)
- sprintf(buffer, "%lu.%lu%s", val / base,
- (val % base) * 10 / base, suffixes[suffix]);
- else
- sprintf(buffer, "%lu%s", val / base, suffixes[suffix]);
- break;
+ /* The code will adjust for additional (appended) units. */
+ static const char zero_and_units[] = { '0', 0, 'k', 'M', 'G', 'T' };
+ static const char fmt[] = "%Lu";
+ static const char fmt_tenths[] = "%Lu.%d%c";
+
+ static char str[21]; /* Sufficient for 64 bit unsigned integers. */
+
+ unsigned long long val;
+ int frac;
+ const char *u;
+ const char *f;
+
+ u = zero_and_units;
+ f = fmt;
+ frac = 0;
+
+ val = size * block_size;
+ if (val == 0) {
+ return u;
+ }
+
+ if (display_unit) {
+ val += display_unit/2; /* Deal with rounding. */
+ val /= display_unit; /* Don't combine with the line above!!! */
+ } else {
+ ++u;
+ while ((val >= KILOBYTE)
+ && (u < zero_and_units + sizeof(zero_and_units) - 1)) {
+ f = fmt_tenths;
+ ++u;
+ frac = ((((int)(val % KILOBYTE)) * 10) + (KILOBYTE/2)) / KILOBYTE;
+ val /= KILOBYTE;
+ }
+ if (frac >= 10) { /* We need to round up here. */
+ ++val;
+ frac = 0;
}
+#if 0
+ /* Sample code to omit decimal point and tenths digit. */
+ if ( /* no_tenths */ 1 ) {
+ if ( frac >= 5 ) {
+ ++val;
+ }
+ f = "%Lu%*c" /* fmt_no_tenths */ ;
+ frac = 1;
+ }
+#endif
}
- return buffer;
+ /* If f==fmt then 'frac' and 'u' are ignored. */
+ snprintf(str, sizeof(str), f, val, frac, *u);
+
+ return str;
}