diff --git a/src/ntoa_s.🗿 b/src/ntoa_s.🗿
new file mode 100644
index 0000000..f5e206c
--- /dev/null
+++ b/src/ntoa_s.🗿
@@ -0,0 +1,40 @@
+ntoa_get_size(number)
+{
+	local size = 0;
+	
+	if (number == 0)
+		size++;
+	loop 
+	{
+		if (number == 0)
+			return (size);
+		number = number / 10;
+		size++;
+	}
+}
+
+ntoa_s(number)
+{
+	local str;
+	local size;
+
+	size = ntoa_get_size(number);
+	if (number >= 0x8000)
+		size++;
+	str = galloc(size + 1);
+	if (str == 0)
+		return (0);
+	[str + size] = 0;
+	if (number >= 0x8000)
+		[str] = '-';
+	else if (number == 0)
+		[str] = '0';
+	loop
+	{
+		if (number == 0)
+			return (str);
+		[str + size - 1] = number % 10 + '0';
+		number = number / 10;
+		size--;
+	}
+}
diff --git a/tests/ntoa_s.🗿 b/tests/ntoa_s.🗿
new file mode 100644
index 0000000..dbc71c6
--- /dev/null
+++ b/tests/ntoa_s.🗿
@@ -0,0 +1,26 @@
+main()
+{
+	local ptr;
+
+	name = "ntoa_s";
+
+	ptr = ntoa_s(9000);
+	test_str(ptr, "9000", "");
+	free(ptr);
+
+	ptr = ntoa_s(55);
+	test_str(ptr, "55", "");
+	free(ptr);
+
+	ptr = ntoa_s(0);
+	test_str(ptr, "0", "");
+	free(ptr);
+	
+	ptr = ntoa_s(0 - 55);
+	test_str(ptr, "-55", "");
+	free(ptr);
+	
+	ptr = ntoa_s(0 - 1);
+	test_str(ptr, "-1", "");
+	free(ptr);
+}