bool Options::is_numeric()

in src/options.cc [22:32]

• 9 lines of code
• 5 McCabe index (conditional complexity)

	bool Options::is_numeric(const char *arg) {
		// if first digit is 0, that should be the whole string
		if (arg[0] == '0' && arg[1] != '\0') return false;
		// iterate through characters
		for(;*arg;arg=&arg[1]) {
			if (*arg < '0' || *arg > '9') {
				return false;
			}
		}
		return true;
	}