tools/perf/util/spark.c

   1 #include <stdio.h>
   2 #include <limits.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include "spark.h"
   6 #include "stat.h"
   7
   8 #define SPARK_SHIFT 8
   9
  10 /* Print spark lines on outf for numval values in val. */
  11 int print_spark(char *bf, int size, unsigned long *val, int numval)
  12 {
  13         static const char *ticks[NUM_SPARKS] = {
  14                 "▁",  "▂", "▃", "▄", "▅", "▆", "▇", "█"
  15         };
  16         int i, printed = 0;
  17         unsigned long min = ULONG_MAX, max = 0, f;
  18
  19         for (i = 0; i < numval; i++) {
  20                 if (val[i] < min)
  21                         min = val[i];
  22                 if (val[i] > max)
  23                         max = val[i];
  24         }
  25         f = ((max - min) << SPARK_SHIFT) / (NUM_SPARKS - 1);
  26         if (f < 1)
  27                 f = 1;
  28         for (i = 0; i < numval; i++) {
  29                 printed += scnprintf(bf + printed, size - printed, "%s",
  30                                      ticks[((val[i] - min) << SPARK_SHIFT) / f]);
  31         }
  32
  33         return printed;
  34 }