diff --git a/src/aton_s.🗿 b/src/aton_s.🗿
new file mode 100644
index 0000000..f3e9ed6
--- /dev/null
+++ b/src/aton_s.🗿
@@ -0,0 +1,23 @@
+aton_s(str)
+{
+	local i = 0;
+	local sign = 0;
+	local out = 0;
+
+	loop {
+		if ([str + i] == '-')
+			sign = sign == 0;
+		else if ([str + i] != '+')
+			break;
+		i++;
+	}
+	loop {
+		if ([str + i] == 0 | isdigit([str + i]) == 0)
+			break;
+		out = out * 10 + [str + i] - '0';
+		i++;
+	}
+	if (sign)
+		return (0 - out);
+	return out;
+}
diff --git a/tests/aton_s.🗿 b/tests/aton_s.🗿
new file mode 100644
index 0000000..ffb5fc6
--- /dev/null
+++ b/tests/aton_s.🗿
@@ -0,0 +1,12 @@
+main()
+{
+	name = "aton_s";
+
+	test_num(aton_s("33"), 33, "");
+	test_num(aton_s(""), 0, "");
+	test_num(aton_s("40"), 40, "");
+	test_num(aton_s("1"), 1, "");
+	test_num(aton_s("-"), 0, "");
+	test_num(aton_s("-40"), 0 - 40, "");
+	test_num(aton_s("-1"), 0 - 1, "");
+}