Initial project import

tools/v/vlib/io/io_test.v

@@ -0,0 +1,41 @@
+import io
+
+struct Buf {
+pub:
+	bytes []u8
+mut:
+	i int
+}
+
+struct Writ {
+pub mut:
+	bytes []u8
+}
+
+fn (mut b Buf) read(mut buf []u8) !int {
+	if !(b.i < b.bytes.len) {
+		return io.Eof{}
+	}
+	n := copy(mut buf, b.bytes[b.i..])
+	b.i += n
+	return n
+}
+
+fn (mut w Writ) write(buf []u8) !int {
+	if buf.len <= 0 {
+		return error('none')
+	}
+	w.bytes << buf
+	return buf.len
+}
+
+fn test_copy() {
+	mut src := Buf{
+		bytes: 'abcdefghij'.repeat(10).bytes()
+	}
+	mut dst := Writ{
+		bytes: []u8{}
+	}
+	io.cp(mut src, mut dst) or { assert false }
+	assert dst.bytes == src.bytes
+}