From 061067bf955cdfbbf0beba755ede512792757556 Mon Sep 17 00:00:00 2001
From: wdvxdr <wdvxdr@foxmail.com>
Date: Mon, 12 Jul 2021 13:04:04 +0800
Subject: [PATCH] enable vet.

---
 .github/workflows/go.yml |  3 +++
 utils/sys.go             | 13 ++++++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index c7b0db0f..bfa9f6a0 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -25,6 +25,9 @@ jobs:
       run: |
         go get -v -t -d ./...
 
+    - name: Vet
+      run: go vet -stdmethods=false ./...
+
     - name: Build
       run: go build -v ./...
 
diff --git a/utils/sys.go b/utils/sys.go
index 6d383b21..f7d587da 100644
--- a/utils/sys.go
+++ b/utils/sys.go
@@ -13,15 +13,18 @@ type multiReadSeeker struct {
 	multiReader io.Reader
 }
 
+func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(p) + x)
+}
+
 func IsChanClosed(ch interface{}) bool {
 	if reflect.TypeOf(ch).Kind() != reflect.Chan {
 		panic("object is not a channel.")
 	}
-	ptr := *(*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&ch)) + unsafe.Sizeof(uint(0))))
-	ptr += unsafe.Sizeof(uint(0)) * 2
-	ptr += unsafe.Sizeof(uintptr(0))
-	ptr += unsafe.Sizeof(uint16(0))
-	return *(*uint32)(unsafe.Pointer(ptr)) > 0
+	return *(*uint32)(
+		add(*(*unsafe.Pointer)(add(unsafe.Pointer(&ch), unsafe.Sizeof(uintptr(0)))),
+			unsafe.Sizeof(uint(0))*2+unsafe.Sizeof(uintptr(0))+unsafe.Sizeof(uint16(0))),
+	) > 0
 }
 
 func ComputeMd5AndLength(r io.Reader) ([]byte, int64) {