bool arg_to_number()

in src/options.h [96:123]
19 lines of code
6 McCabe index (conditional complexity)

			bool arg_to_number(OptionType opt, size_t block_size, T * ret) {
				// fail if option wasn't given
				if (!opts.count(opt)) return false;

				// get the option
				DiskspdOption& option = opt_map[opts[opt]];

				// check there's an actual arg, if not, succeed but do nothing
				if (!option.arg.c_str()[0]) return true;

				unsigned long long result;
				// check if it's a number
				if (option.flags & OPT_NUMERIC) {
					result = strtoull(option.arg.c_str(), NULL, 10);
				// check if it's a byte size
				} else if (option.flags & OPT_BYTE_SIZE) {
					result = byte_size_from_arg(option.arg.c_str(), block_size);
				} else {
					assert(!"Invalid argument passed to arg_to_number!"); // programmer error
				}
				if (result > std::numeric_limits<T>::max()) {
					fprintf(stderr, "Argument to -%c too large\n", (char)option.opt.key);
					exit(1);
				}
				*ret = static_cast<T>(result);

				return true;
			}