io::read_fully now handles unbounded streams properly

test/unit/stdlib/io/read_full.c3

@@ -0,0 +1,30 @@
+module std::io @test;
+
+struct Test (InStream)
+{
+	char[] data;
+	int index;
+}
+
+fn char? Test.read_byte(&self) @dynamic
+{
+	if (self.index >= self.data.len) return io::EOF~;
+	return self.data[self.index++];
+}
+
+fn usz? Test.read(&self, char[] buffer) @dynamic
+{
+	io::printn(*self);
+	if (self.index >= self.data.len) return io::EOF~;
+	int len = min((int)self.data.len - self.index, 16);
+	buffer[:len] = self.data[self.index:len];
+	self.index += len;
+	return len;
+}
+
+fn void read_fully_stream()
+{
+	Test t = { .data = "Heokep o opewkfpewkfpoew kfopwekfop ewkf ewopfkewop fopkewfopk ewopfkewpo fkopew kfpoewk fej!" };
+	char[] data = io::read_fully(tmem, &t)!!;
+	test::eq(data, t.data);
+}