Feature(runtime): Use sprintf

ovr · ovr · commit c4f9a1f7fbde · 2018-11-04T14:11:17.000+09:00
diff --git a/runtime/CMakeLists.txt b/runtime/CMakeLists.txt
@@ -4,8 +4,6 @@ project(hlvm-runtime)
 
 set(CMAKE_BUILD_TYPE Release)
 set(CMAKE_CXX_STANDARD 14)
-set(SOURCE_FILES helpers.cpp)
-
-#add_executable(runtime main.cpp)
+set(SOURCE_FILES helpers.cpp helpers.h helpers.h)
 
 add_library(hlvm-runtime STATIC ${SOURCE_FILES})
diff --git a/runtime/helpers.cpp b/runtime/helpers.cpp
@@ -2,10 +2,12 @@
 #include <sstream>
 #include <iostream>
 
+#include "helpers.h"
+
 __attribute__ ((visibility ("default"))) const char* number2string(double number) {
-    std::stringstream s;
+    char* result = new char[100];
 
-    s << number;
+    sprintf(result, "%f", number);
 
-    return s.str().c_str();
+    return result;
 }
diff --git a/runtime/helpers.h b/runtime/helpers.h
@@ -0,0 +1,7 @@
+
+#ifndef HLVM_RUNTIME_HELPERS_H
+#define HLVM_RUNTIME_HELPERS_H
+
+__attribute__ ((visibility ("default"))) const char* number2string(double number);
+
+#endif //HLVM_RUNTIME_HELPERS_H
