1 files changed, 42 insertions, 0 deletions
diff --git a/include/libn.h b/include/libn.h
index c8d510f..67d131d 100644
--- a/include/libn.h
+++ b/include/libn.h
@@ -107,6 +107,48 @@ vlong   io·write(Stream *s, int sz, int n, void *buf);
 int     io·flush(Stream *s);
 int     io·seek(Stream *s, long off, enum SeekPos origin);
 
+/* Generic I/O interfaces */
+
+typedef struct io·Reader
+{
+    int (*read)(int n, void *buf);
+};
+
+typedef struct io·Peeker
+{
+    byte  (*get)(void);
+    error (*unget)(byte);
+};
+
+typedef struct io·FullReader
+{
+    io·Reader;
+    io·Peeker;
+} io·FullReader;
+
+typedef struct io·Writer
+{
+    int (*write)(int n, void *buf);
+} io·Writer;
+
+typedef struct io·Putter
+{
+    error (*put)(byte);
+    int   (*putstr)(string);
+} io·Putter;
+
+typedef struct io·FullWriter
+{
+    io·Writer;
+    io·Putter;
+} io·FullWriter;
+
+typedef struct io·ReadWriter
+{
+    io·Reader;
+    io·Writer;
+} io·ReadWriter;
+
 // -----------------------------------------------------------------------------
 // Buffered I/O