perf/util/spark.c

0001 #include <stdio.h>
0002 #include <limits.h>
0003 #include <string.h>
0004 #include <stdlib.h>
0005 #include "spark.h"
0006 #include "stat.h"
0007
0008 #define SPARK_SHIFT 8
0009
0010 /* Print spark lines on outf for numval values in val. */
0011 int print_spark(char *bf, int size, unsigned long *val, int numval)
0012 {
0013     static const char *ticks[NUM_SPARKS] = {
0014         "▁",  "▂", "▃", "▄", "▅", "▆", "▇", "█"
0015     };
0016     int i, printed = 0;
0017     unsigned long min = ULONG_MAX, max = 0, f;
0018
0019     for (i = 0; i < numval; i++) {
0020         if (val[i] < min)
0021             min = val[i];
0022         if (val[i] > max)
0023             max = val[i];
0024     }
0025     f = ((max - min) << SPARK_SHIFT) / (NUM_SPARKS - 1);
0026     if (f < 1)
0027         f = 1;
0028     for (i = 0; i < numval; i++) {
0029         printed += scnprintf(bf + printed, size - printed, "%s",
0030                      ticks[((val[i] - min) << SPARK_SHIFT) / f]);
0031     }
0032
0033     return printed;
0034 }