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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#define isbinary(x) (iscntrl(x) || (x) == 127)
#define FILL_CHARACTER '.'
void print_usage(const char *progname) {
printf("Usage: %s < [SAMPLE_TEXT]\n", progname);
printf("Options:\n");
printf(" -h, --help Show this help message\n");
}
int main(int argc, char *argv[])
{
unsigned long int count[0x100];
int i, c;
int opt;
int option_index = 0;
static struct option long_options[] =
{
/* These options set a flag. */
{"help", no_argument, 0, 'h'}
};
opt = getopt_long (argc, argv, "h:",
long_options, &option_index);
switch (opt) {
case -1:
break;
case 'h':
print_usage(argv[0]);
return 0;
default:
print_usage(argv[0]);
return 1;
}
for (i = 0; i < 0x100; i++)
count[i]=0;
while ((c = getchar()) != EOF)
count[c]++;
for (i = 0; i < 0x100; i++) {
if (count[i]) {
printf("0x%02x ", i);
printf("%c %lu\n", isbinary(i) ? '.' : i, count[i]);
}
}
return 0;
}
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