Count (ascii) char occurrences in any utf8 file

char-counter.cpp

#include <cctype>
#include <cstdint>
#include <fstream>
#include <iostream>
#include <locale>
#include <algorithm>

int main(int argc, char **argv)
{
    std::locale::global(std::locale(""));

	std::pair<char, uint64_t> stats[127] = {};
	for (int i = 0; i < 127; i++) stats[i].first = char(i);

	for (int i = 1; i < argc; i++)
	{
    	std::wifstream wf(argv[i]);

    	for (wchar_t c; wf.get(c); )
		{
			// 0..126
			if (c < 127) stats[c].second++;
			//std::cout << c << std::endl;
		}
	}

	std::sort(std::begin(stats), std::end(stats), [](auto a, auto b)
	{
		return a.second > b.second;
	});

	for (int i = 0; i < 127; i++)
	{
		char c = stats[i].first;
		if (std::isprint(c)) std::cout << c;
		else std::cout << int(c);
		std::cout << ": " << stats[i].second << std::endl;
	}

	return 0;
}