src: apply clang-tidy various improvement

* rewrite to default label in method ConvertUVErrorCode
* improve if condition in method PeekWritable
* remove redundant cast in node_file.cc

PR-URL: #26470
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_api.cc

@@ -7,6 +7,8 @@
 #include "node_errors.h"
 #include "node_internals.h"
 
+#include <memory>
+
 struct node_napi_env__ : public napi_env__ {
   explicit node_napi_env__(v8::Local<v8::Context> context):
       napi_env__(context) {
@@ -220,9 +222,9 @@ class ThreadSafeFunction : public node::AsyncResource {
 
     if (uv_async_init(loop, &async, AsyncCb) == 0) {
       if (max_queue_size > 0) {
-        cond.reset(new node::ConditionVariable);
+        cond = std::make_unique<node::ConditionVariable>();
       }
-      if ((max_queue_size == 0 || cond.get() != nullptr) &&
+      if ((max_queue_size == 0 || cond) &&
           uv_idle_init(loop, &idle) == 0) {
         return napi_ok;
       }
@@ -809,15 +811,15 @@ namespace uvimpl {
 
 static napi_status ConvertUVErrorCode(int code) {
   switch (code) {
-  case 0:
-    return napi_ok;
-  case UV_EINVAL:
-    return napi_invalid_arg;
-  case UV_ECANCELED:
-    return napi_cancelled;
+    case 0:
+      return napi_ok;
+    case UV_EINVAL:
+      return napi_invalid_arg;
+    case UV_ECANCELED:
+      return napi_cancelled;
+    default:
+      return napi_generic_failure;
   }
-
-  return napi_generic_failure;
 }
 
 // Wrapper around uv_work_t which calls user-provided callbacks.

src/node_crypto_bio.cc

@@ -427,9 +427,7 @@ char* NodeBIO::PeekWritable(size_t* size) {
   TryAllocateForWrite(*size);
 
   size_t available = write_head_->len_ - write_head_->write_pos_;
-  if (*size != 0 && available > *size)
-    available = *size;
-  else
+  if (*size == 0 || available <= *size)
     *size = available;
 
   return write_head_->data_ + write_head_->write_pos_;

src/node_file.cc

@@ -1659,7 +1659,7 @@ static void WriteBuffer(const FunctionCallbackInfo<Value>& args) {
   const int64_t pos = GET_OFFSET(args[4]);
 
   char* buf = buffer_data + off;
-  uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
+  uv_buf_t uvbuf = uv_buf_init(buf, len);
 
   FSReqBase* req_wrap_async = GetReqWrap(env, args[5]);
   if (req_wrap_async != nullptr) {  // write(fd, buffer, off, len, pos, req)
@@ -1858,7 +1858,7 @@ static void Read(const FunctionCallbackInfo<Value>& args) {
   const int64_t pos = args[4].As<Integer>()->Value();
 
   char* buf = buffer_data + off;
-  uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
+  uv_buf_t uvbuf = uv_buf_init(buf, len);
 
   FSReqBase* req_wrap_async = GetReqWrap(env, args[5]);
   if (req_wrap_async != nullptr) {  // read(fd, buffer, offset, len, pos, req)
@@ -2113,7 +2113,7 @@ static void Mkdtemp(const FunctionCallbackInfo<Value>& args) {
     SyncCall(env, args[3], &req_wrap_sync, "mkdtemp",
              uv_fs_mkdtemp, *tmpl);
     FS_SYNC_TRACE_END(mkdtemp);
-    const char* path = static_cast<const char*>(req_wrap_sync.req.path);
+    const char* path = req_wrap_sync.req.path;
 
     Local<Value> error;
     MaybeLocal<Value> rc =