tools/perf/util/units.c

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