* representations (say, powers of 1024) and manipulating coefficients.
* The base ten "bytes" output could be handled similarly.
*
- * 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
+ * 2) This routine 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.
*
- * 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.
+ * If block_size is also 0, no decimal digits are printed.
*
- * 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 source tree.
*/
-
#include "libbb.h"
-const char *make_human_readable_str(unsigned long long size,
+const char* FAST_FUNC make_human_readable_str(unsigned long long val,
unsigned long block_size, unsigned long display_unit)
{
- /* The code will adjust for additional (appended) units. */
- static const char zero_and_units[] = { '0', 0, 'k', 'M', 'G', 'T' };
- static const char fmt[] = "%llu";
- static const char fmt_tenths[] = "%llu.%d%c";
-
- static char str[21]; /* Sufficient for 64 bit unsigned integers. */
+ static const char unit_chars[] ALIGN1 = {
+ '\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'
+ };
- unsigned long long val;
- int frac;
+ unsigned frac; /* 0..9 - the fractional digit */
const char *u;
- const char *f;
+ const char *fmt;
- u = zero_and_units;
- f = fmt;
- frac = 0;
+ if (val == 0)
+ return "0";
- val = size * block_size;
- if (val == 0) {
- return u;
- }
+ 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!!! */
+ 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 {
- ++u;
while ((val >= 1024)
- && (u < zero_and_units + sizeof(zero_and_units) - 1)
+ /* && (u < unit_chars + sizeof(unit_chars) - 1) - always true */
) {
- f = fmt_tenths;
- ++u;
- frac = (((int)(val % 1024)) * 10 + 1024/2) / 1024;
+ fmt = "%llu.%u%c";
+ u++;
+ frac = (((unsigned)val % 1024) * 10 + 1024/2) / 1024;
val /= 1024;
}
- if (frac >= 10) { /* We need to round up here. */
+ 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 1
+ /* If block_size is 0, dont print fractional part */
+ if (block_size == 0) {
if (frac >= 5) {
++val;
}
- f = "%llu%*c" /* fmt_no_tenths */;
+ fmt = "%llu%*c";
frac = 1;
}
#endif
}
- /* If f==fmt then 'frac' and 'u' are ignored. */
- snprintf(str, sizeof(str), f, val, frac, *u);
+ return auto_string(xasprintf(fmt, val, frac, *u));
+}
+
+
+/* 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) */
+char* FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], 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..." */
+ }
+ return buf + 5;
+}
+
+/* Convert unsigned long long value into compact 4-char
+ * representation. Examples: "1234", "1.2k", " 27M", "123T"
+ * String is not terminated (buf[4] is untouched) */
+char* FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale)
+{
+ const char *fmt;
+ char c;
+ unsigned v, u, idx = 0;
+
+ 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
- return str;
+ 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..." */
+ }
+ return buf + 4;
}
projects / oweals / busybox.git / blobdiff