/* 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
+ * 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.
*
- * 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.
+ * Some code to omit the decimal point and tenths digit is sketched out
+ * and "#if 0"'d below.
*
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
-#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 not_hr)
+const char* FAST_FUNC make_human_readable_str(unsigned long long val,
+ unsigned long block_size, unsigned long display_unit)
{
- int suffix, base;
-
- if (not_hr)
- sprintf(buffer, "%lu", val);
- else
- 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;
+ static const char unit_chars[] ALIGN1 = {
+ '\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'
+ };
+
+ static char *str;
+
+ unsigned frac; /* 0..9 - the fractional digit */
+ const char *u;
+ const char *fmt;
+
+ if (val == 0)
+ return "0";
+
+ fmt = "%llu";
+ if (block_size > 1)
+ val *= block_size;
+ frac = 0;
+ u = unit_chars;
+
+ if (display_unit) {
+ val += display_unit/2; /* Deal with rounding */
+ val /= display_unit; /* Don't combine with the line above! */
+ /* will just print it as ulonglong (below) */
+ } else {
+ while ((val >= 1024)
+ /* && (u < unit_chars + sizeof(unit_chars) - 1) - always true */
+ ) {
+ fmt = "%llu.%u%c";
+ u++;
+ frac = (((unsigned)val % 1024) * 10 + 1024/2) / 1024;
+ val /= 1024;
+ }
+ if (frac >= 10) { /* we need to round up here */
+ ++val;
+ frac = 0;
+ }
+#if 1
+ /* If block_size is 0, dont print fractional part */
+ if (block_size == 0) {
+ if (frac >= 5) {
+ ++val;
}
+ fmt = "%llu%*c";
+ frac = 1;
+ }
+#endif
+ }
+
+ if (!str) {
+ /* sufficient for any width of val */
+ str = xmalloc(sizeof(val)*3 + 2 + 3);
+ }
+ sprintf(str, fmt, val, frac, *u);
+ return str;
+}
+
+
+/* vda's implementations of the similar idea */
+
+/* Convert unsigned long long value into compact 5-char representation.
+ * String is not terminated (buf[5] is untouched) */
+void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
+{
+ const char *fmt;
+ char c;
+ unsigned v, u, idx = 0;
+
+ if (ul > 99999) { // do not scale if 99999 or less
+ ul *= 10;
+ do {
+ ul /= 1024;
+ idx++;
+ } while (ul >= 100000);
+ }
+ v = ul; // ullong divisions are expensive, avoid them
+
+ fmt = " 123456789";
+ u = v / 10;
+ v = v % 10;
+ if (!idx) {
+ // 99999 or less: use "12345" format
+ // u is value/10, v is last digit
+ c = buf[0] = " 123456789"[u/1000];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[1] = fmt[u/100%10];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[2] = fmt[u/10%10];
+ if (c != ' ') fmt = "0123456789";
+ buf[3] = fmt[u%10];
+ buf[4] = "0123456789"[v];
+ } else {
+ // value has been scaled into 0..9999.9 range
+ // u is value, v is 1/10ths (allows for 92.1M format)
+ if (u >= 100) {
+ // value is >= 100: use "1234M', " 123M" formats
+ c = buf[0] = " 123456789"[u/1000];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[1] = fmt[u/100%10];
+ if (c != ' ') fmt = "0123456789";
+ v = u % 10;
+ u = u / 10;
+ buf[2] = fmt[u%10];
+ } else {
+ // value is < 100: use "92.1M" format
+ c = buf[0] = " 123456789"[u/10];
+ if (c != ' ') fmt = "0123456789";
+ buf[1] = fmt[u%10];
+ buf[2] = '.';
}
+ buf[3] = "0123456789"[v];
+ buf[4] = scale[idx]; /* typically scale = " kmgt..." */
+ }
+}
+
+/* Convert unsigned long long value into compact 4-char
+ * representation. Examples: "1234", "1.2k", " 27M", "123T"
+ * String is not terminated (buf[4] is untouched) */
+void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
+{
+ const char *fmt;
+ char c;
+ unsigned v, u, idx = 0;
- return buffer;
+ if (ul > 9999) { // do not scale if 9999 or less
+ ul *= 10;
+ do {
+ ul /= 1024;
+ idx++;
+ } while (ul >= 10000);
+ }
+ v = ul; // ullong divisions are expensive, avoid them
+
+ fmt = " 123456789";
+ u = v / 10;
+ v = v % 10;
+ if (!idx) {
+ // 9999 or less: use "1234" format
+ // u is value/10, v is last digit
+ c = buf[0] = " 123456789"[u/100];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[1] = fmt[u/10%10];
+ if (c != ' ') fmt = "0123456789";
+ buf[2] = fmt[u%10];
+ buf[3] = "0123456789"[v];
+ } else {
+ // u is value, v is 1/10ths (allows for 9.2M format)
+ if (u >= 10) {
+ // value is >= 10: use "123M', " 12M" formats
+ c = buf[0] = " 123456789"[u/100];
+ if (c != ' ') fmt = "0123456789";
+ v = u % 10;
+ u = u / 10;
+ buf[1] = fmt[u%10];
+ } else {
+ // value is < 10: use "9.2M" format
+ buf[0] = "0123456789"[u];
+ buf[1] = '.';
+ }
+ buf[2] = "0123456789"[v];
+ buf[3] = scale[idx]; /* typically scale = " kmgt..." */
+ }
}
projects / oweals / busybox.git / blobdiff