tools/perf/util/units.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "units.h"
   3 #include <inttypes.h>
   4 #include <limits.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <linux/kernel.h>
   8 #include <linux/time64.h>
   9
  10 unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
  11 {
  12         struct parse_tag *i = tags;
  13
  14         while (i->tag) {
  15                 char *s = strchr(str, i->tag);
  16
  17                 if (s) {
  18                         unsigned long int value;
  19                         char *endptr;
  20
  21                         value = strtoul(str, &endptr, 10);
  22                         if (s != endptr)
  23                                 break;
  24
  25                         if (value > ULONG_MAX / i->mult)
  26                                 break;
  27                         value *= i->mult;
  28                         return value;
  29                 }
  30                 i++;
  31         }
  32
  33         return (unsigned long) -1;
  34 }
  35
  36 unsigned long convert_unit(unsigned long value, char *unit)
  37 {
  38         *unit = ' ';
  39
  40         if (value > 1000) {
  41                 value /= 1000;
  42                 *unit = 'K';
  43         }
  44
  45         if (value > 1000) {
  46                 value /= 1000;
  47                 *unit = 'M';
  48         }
  49
  50         if (value > 1000) {
  51                 value /= 1000;
  52                 *unit = 'G';
  53         }
  54
  55         return value;
  56 }
  57
  58 int unit_number__scnprintf(char *buf, size_t size, u64 n)
  59 {
  60         char unit[4] = "BKMG";
  61         int i = 0;
  62
  63         while (((n / 1024) > 1) && (i < 3)) {
  64                 n /= 1024;
  65                 i++;
  66         }
  67
  68         return scnprintf(buf, size, "%" PRIu64 "%c", n, unit[i]);
  69 }