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#define _POSIX_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
if (isatty(fileno(stdin)) && (argc < 2 || !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))) {
fprintf(stderr, "Spark\n by Jason A. Donenfeld <Jason@zx2c4.com>\n\n");
fprintf(stderr, "Usage: %s [number] [number] [number] ...\n", argv[0]);
fprintf(stderr, "If no arguments are given, read from stdin numbers delimited by\n");
fprintf(stderr, "any characters except 0 1 2 3 4 5 6 7 8 9 . - e E.\n");
return 1;
}
double *values;
int total;
double max = DBL_MIN;
double min = DBL_MAX;
if (argc > 1) {
total = argc - 1;
values = malloc(sizeof(double) * total);
if (!values) {
perror("malloc");
return 2;
}
for (int i = 0; i < total; ++i) {
values[i] = atof(argv[i + 1]);
if (values[i] > max)
max = values[i];
if (values[i] < min)
min = values[i];
}
} else {
char buffer[32];
int i = 0;
int c = 0;
int size = 16;
total = 0;
values = malloc(sizeof(double) * size);
if (!values) {
perror("malloc");
return 2;
}
while (c != EOF) {
for (;;) {
c = getchar();
if ((c >= '0' && c <= '9') || c == '.' || c == '-' || c == 'e' || c == 'E')
buffer[i++] = c;
else
break;
if (i == 31)
break;
}
buffer[i] = '\0';
if (i) {
if (total == size) {
size *= 2;
values = realloc(values, sizeof(double) * size);
if (!values) {
perror("realloc");
return 2;
}
}
values[total] = atof(buffer);
if (values[total] > max)
max = values[total];
if (values[total] < min)
min = values[total];
++total;
}
i = 0;
}
}
double difference = max - min + 1;
if (difference < 1)
difference = 1;
const int levels = 8;
for (int i = 0; i < total; ++i) {
putchar('\xe2');
putchar('\x96');
putchar('\x81' + (int)round((values[i] - min + 1) / difference * (levels - 1)));
}
putchar('\n');
free(values);
return 0;
}
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