perf/util/units.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include "units.h"
0003 #include <inttypes.h>
0004 #include <limits.h>
0005 #include <stdlib.h>
0006 #include <string.h>
0007 #include <linux/kernel.h>
0008 #include <linux/time64.h>
0009
0010 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
0011 {
0012     struct parse_tag *i = tags;
0013
0014     while (i->tag) {
0015         char *s = strchr(str, i->tag);
0016
0017         if (s) {
0018             unsigned long int value;
0019             char *endptr;
0020
0021             value = strtoul(str, &endptr, 10);
0022             if (s != endptr)
0023                 break;
0024
0025             if (value > ULONG_MAX / i->mult)
0026                 break;
0027             value *= i->mult;
0028             return value;
0029         }
0030         i++;
0031     }
0032
0033     return (unsigned long) -1;
0034 }
0035
0036 double convert_unit_double(double value, char *unit)
0037 {
0038     *unit = ' ';
0039
0040     if (value > 1000.0) {
0041         value /= 1000.0;
0042         *unit = 'K';
0043     }
0044
0045     if (value > 1000.0) {
0046         value /= 1000.0;
0047         *unit = 'M';
0048     }
0049
0050     if (value > 1000.0) {
0051         value /= 1000.0;
0052         *unit = 'G';
0053     }
0054
0055     return value;
0056 }
0057
0058 unsigned long convert_unit(unsigned long value, char *unit)
0059 {
0060     double v = convert_unit_double((double)value, unit);
0061
0062     return (unsigned long)v;
0063 }
0064
0065 int unit_number__scnprintf(char *buf, size_t size, u64 n)
0066 {
0067     char unit[4] = "BKMG";
0068     int i = 0;
0069
0070     while (((n / 1024) > 1) && (i < 3)) {
0071         n /= 1024;
0072         i++;
0073     }
0074
0075     return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);
0076 }