Improve error handling in tcore clipboard and IMF context

Fail gracefully when the tizen-core-wl display cannot be obtained in
TizenClipboard, validate the fd and handle partial write() results
when sending clipboard data, and check the tizen_core_imf_init()
result so that tizen_core_imf_shutdown() is only called when the
library was actually initialized.

Author: JSUYA

flutter/shell/platform/tizen/tizen_clipboard.cc

@@ -36,6 +36,11 @@ TizenClipboard::TizenClipboard(TizenViewBase* view) {
     tizen_core_wl_get_connected_display(nullptr, &display_);
   }
 
+  if (!display_) {
+    FT_LOG(Error) << "Failed to obtain a tizen-core-wl display.";
+    return;
+  }
+
   tizen_core_wl_display_get_event(display_, &tcore_wl_event_);
 
   tizen_core_wl_event_add_listener(
@@ -104,7 +109,22 @@ void TizenClipboard::SendData(void* event) {
     return;
   }
 
-  write(fd, data_.c_str(), data_.length());
+  if (fd < 0) {
+    FT_LOG(Error) << "Invalid fd.";
+    return;
+  }
+
+  const char* buffer = data_.c_str();
+  size_t remaining = data_.length();
+  while (remaining > 0) {
+    ssize_t written = write(fd, buffer, remaining);
+    if (written < 0) {
+      FT_LOG(Error) << "Failed to write clipboard data.";
+      break;
+    }
+    buffer += written;
+    remaining -= written;
+  }
   close(fd);
 }
 

flutter/shell/platform/tizen/tizen_input_method_context_tcore.cc

@@ -134,7 +134,11 @@ tizen_core_imf_event_key_h CreateImfKeyEventFromTcoreWlEvent(void* event) {
 namespace flutter {
 
 TizenInputMethodContext::TizenInputMethodContext(uintptr_t window_id) {
-  tizen_core_imf_init();
+  if (tizen_core_imf_init() != TIZEN_CORE_IMF_ERROR_NONE) {
+    FT_LOG(Error) << "Failed to initialize tizen_core_imf.";
+    return;
+  }
+  imf_initialized_ = true;
 
   if (tizen_core_imf_context_create(&imf_context_) !=
       TIZEN_CORE_IMF_ERROR_NONE) {
@@ -157,7 +161,9 @@ TizenInputMethodContext::~TizenInputMethodContext() {
     tizen_core_imf_context_destroy(imf_context_);
   }
 
-  tizen_core_imf_shutdown();
+  if (imf_initialized_) {
+    tizen_core_imf_shutdown();
+  }
 }
 
 bool TizenInputMethodContext::HandleTcoreWlEventKey(void* event, bool is_down) {

flutter/shell/platform/tizen/tizen_input_method_context_tcore.h

@@ -88,6 +88,7 @@ class TizenInputMethodContext {
   void SetContextOptions();
   void SetInputPanelOptions();
 
+  bool imf_initialized_ = false;
   tizen_core_imf_context_h imf_context_ = nullptr;
   OnCommit on_commit_;
   OnPreeditChanged on_preedit_changed_;