1 files changed, 44 insertions, 0 deletions
diff --git a/src/io.zig b/src/io.zig
new file mode 100644
index 0000000..549711d
--- /dev/null
+++ b/src/io.zig
@@ -0,0 +1,44 @@
+const std = @import("std");
+
+pub const IOErrors = error{
+    IOError,
+    NotImplemented,
+};
+
+pub const Functions = struct {
+    characterInput: fn () IOErrors!i64,
+    decimalInput: fn () IOErrors!i64,
+    characterOutput: fn (i64) IOErrors!void,
+    decimalOutput: fn (i64) IOErrors!void,
+};
+
+pub const defaultFunctions = Functions{
+    .characterInput = characterInput,
+    .decimalInput = decimalInput,
+    .characterOutput = characterOutput,
+    .decimalOutput = decimalOutput,
+};
+
+fn characterInput() IOErrors!i64 {
+    // TODO
+    return error.NotImplemented;
+}
+
+fn decimalInput() IOErrors!i64 {
+    // TODO
+    return error.NotImplemented;
+}
+
+fn characterOutput(v: i64) IOErrors!void {
+    std.debug.print("{c}", .{@intCast(u8, v)});
+    return;
+}
+
+fn decimalOutput(v: i64) IOErrors!void {
+    std.debug.print("{d}", .{v});
+    return;
+}
+
+test "all" {
+    std.testing.refAllDecls(@This());
+}