Function StringPrintf

module/src/main/cpp/external/fdutils/stringprintf.cpp:57–64

		delete[] buf;
	}
	std::string StringPrintf(const char* fmt, ...) {
		va_list ap;
		va_start(ap, fmt);
		std::string result;
		StringAppendV(&result, fmt, ap);
		va_end(ap);
		return result;
	}
	void StringAppendF(std::string* dst, const char* format, ...) {
		va_list ap;
		va_start(ap, format);