// SPDX-License-Identifier: GPL-2.0
#include "spark.h"
#include <limits.h>
#include <linux/kernel.h>

#define SPARK_SHIFT 8

/* Print spark lines on outf for numval values in val. */
int print_spark(char *bf, int size, unsigned long *val, int numval)
{
        static const char *ticks[NUM_SPARKS] = {
                "▁",  "▂", "▃", "▄", "▅", "▆", "▇", "█"
        };
        int i, printed = 0;
        unsigned long min = ULONG_MAX, max = 0, f;

        for (i = 0; i < numval; i++) {
                if (val[i] < min)
                        min = val[i];
                if (val[i] > max)
                        max = val[i];
        }
        f = ((max - min) << SPARK_SHIFT) / (NUM_SPARKS - 1);
        if (f < 1)
                f = 1;
        for (i = 0; i < numval; i++) {
                printed += scnprintf(bf + printed, size - printed, "%s",
                                     ticks[((val[i] - min) << SPARK_SHIFT) / f]);
        }

        return printed;
}