init commit: added hist programm

1 files changed, 76 insertions, 0 deletions

diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..cb233e9
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,76 @@
+#include <iostream>
+#include <vector>
+#include <fstream>
+
+// save lines with count
+struct HistEntry {
+	std::string content;
+	int counter;
+};
+
+// global hist vector
+std::vector<HistEntry> histogramm;
+
+// iterate over hist and increment counter or add new Entry
+void handle_bytes(std::string cont)
+{
+	for(std::vector<HistEntry >::iterator it = histogramm.begin(); it != histogramm.end();  it++) {
+		// compare memory
+		if (it->content == cont) {
+			it->counter++;
+			return;
+		}
+	}
+
+	// nothing found, so add new entry
+	HistEntry tmp;
+	tmp.content = cont;
+	tmp.counter = 1;
+
+	histogramm.push_back(tmp);
+
+}
+
+void print_histogramm()
+{
+	for(std::vector<HistEntry >::iterator it = histogramm.begin();
+			it != histogramm.end(); it++) {
+		std::cout << it->counter << "\t" << it->content << std::endl;
+	}
+}
+
+void print_usage(std::string prog_name)
+{
+	std::cout << "usage: " << prog_name << " <file-name>" << std::endl;
+	std::cout << "if <file-name> is \"-\" read from stdin" << std::endl;
+}
+
+int main(int argc, char **argv)
+{
+	if(argc != 2) {
+		print_usage(std::string(argv[0]));
+		return -1;
+	}
+
+	// select input stream based on command line arg
+	bool input_stdin = false;
+	std::string file(argv[1]);
+	std::ifstream fs;
+
+	if (file == "-")
+		input_stdin = true;
+	else 
+		fs.open(file, std::ios_base::in);
+
+	std::istream &read_from = input_stdin ? std::cin : fs;
+
+	// handle input
+	for(std::string line; std::getline(read_from, line);) {
+		handle_bytes(line);
+	}
+
+	print_histogramm();
+
+	return 0;
+}
+