Added units to block sizes

shared_functions/parse_block_units.cpp

@@ -0,0 +1,37 @@
+inline int parse_block_units(const std::string &user_input) {
+	/***
+	inline int parse_block_units(std::string user_input):
+		Parses "block_size" strings such as '10K', '16M', etc
+		
+		Returns the equivalent size measured in bytes
+		
+		Returns -1 if user_input string is invalid
+	***/
+	std::string last_character = user_input.substr(user_input.length()-1, user_input.length()-1);
+	
+	std::string all_but_last_character = user_input.substr(0, user_input.length()-1);
+	
+	if (!is_number(all_but_last_character)) {
+		return -1;
+	}
+	
+	if (last_character == "K" || last_character == "k") {
+		int blocksize = (int)stol(all_but_last_character);
+		return (blocksize * 1024);
+	}
+	
+	if (last_character == "M" || last_character == "m") {
+		int blocksize = (int)stol(all_but_last_character);
+		return (blocksize * 1024 * 1024);
+	}
+	
+	/*
+	If we've made it this far,
+	verify user_input is all digits and just pass the original value through
+	*/
+	
+	if (!is_number(user_input)) {
+		return -1;
+	}
+	return (int)stol(user_input);
+}