From a1994fca99cfaf8da51a11951dd4f20ffbd3692c Mon Sep 17 00:00:00 2001
From: xdavidwu <xdavidwuph@gmail.com>
Date: Sun, 3 Jul 2022 22:00:42 +0800
Subject: [PATCH] evdev::next_event: return status

---
 evdev/libevdev.ha               |  7 +++----
 evdev/types.ha                  | 12 +++++++++++-
 tools/evdev-dump-events/main.ha | 12 +++++++++---
 3 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/evdev/libevdev.ha b/evdev/libevdev.ha
index 7aa89d5..fd331c8 100644
--- a/evdev/libevdev.ha
+++ b/evdev/libevdev.ha
@@ -22,13 +22,12 @@ export fn set_name(dev: libevdev, name: str) void = {
 	c_libevdev_set_name(dev, cstr);
 };
 
-export fn next_event(dev: libevdev, flags: uint) (errors::error | input_event) = {
-	let ev = input_event { ... };
-	const r = c_libevdev_next_event(dev, flags, &ev);
+export fn next_event(dev: libevdev, flags: uint, ev: *input_event) (errors::error | read_status) = {
+	const r = c_libevdev_next_event(dev, flags, ev);
 	if (r < 0) {
 		return errors::errno(-r);
 	};
-	return ev;
+	return r: read_status;
 };
 
 export fn enable_event_type(dev: libevdev, event_type: uint) (void | unknown_error) = {
diff --git a/evdev/types.ha b/evdev/types.ha
index e6a6cf1..8db9b60 100644
--- a/evdev/types.ha
+++ b/evdev/types.ha
@@ -11,4 +11,14 @@ export type input_event = struct {
 
 export type unknown_error = !void;
 
-export def READ_FLAG_NORMAL: uint	= 2;
+export type read_status = enum int {
+	SUCCESS	= 0,
+	SYNC	= 1,
+};
+
+export type read_flag = enum uint {
+	SYNC	= 1,
+	NORMAL	= 2,
+	FORCE_SYNC	= 4,
+	BLOCKING	= 8,
+};
diff --git a/tools/evdev-dump-events/main.ha b/tools/evdev-dump-events/main.ha
index 21d9e0f..6db9d00 100644
--- a/tools/evdev-dump-events/main.ha
+++ b/tools/evdev-dump-events/main.ha
@@ -27,9 +27,15 @@ export fn main() void = {
 	fmt::printfln("Input device name: {}", evdev::get_name(evdev))!;
 
 	for (true) {
-		let ev = match (evdev::next_event(evdev, evdev::READ_FLAG_NORMAL)) {
-		case let ev: evdev::input_event =>
-			yield ev;
+		let ev = evdev::input_event {...};
+		match (evdev::next_event(evdev, evdev::read_flag::NORMAL, &ev)) {
+		case let r: evdev::read_status =>
+			switch (r) {
+			case evdev::read_status::SUCCESS =>
+				yield;
+			case evdev::read_status::SYNC =>
+				continue;
+			};
 		case let err: errors::error =>
 			match (err) {
 			case errors::again =>
-- 
2.45.2