Create Status objects from errno (#1374)

* Add a portable interface to strerror

* Add Status::FromErrno

* Add strerror_test.cc to the Xcode project

* Use glibc feature selection macros instead of return-type overloads

* Fix tensorflow references

1 files changed, 45 insertions, 0 deletions

diff --git a/Firestore/core/src/firebase/firestore/util/status_apple.mm b/Firestore/core/src/firebase/firestore/util/status_apple.mm
new file mode 100644
index 0000000..2e2bb07
--- /dev/null
+++ b/Firestore/core/src/firebase/firestore/util/status_apple.mm
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2015, 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Firestore/core/src/firebase/firestore/util/status.h"
+
+#include <cerrno>
+
+#include "Firestore/core/src/firebase/firestore/util/string_format.h"
+
+namespace firebase {
+namespace firestore {
+namespace util {
+
+Status Status::FromNSError(NSError* error) {
+  NSError* original = error;
+
+  while (error) {
+    if ([error.domain isEqualToString:NSPOSIXErrorDomain]) {
+      return FromErrno(static_cast<int>(error.code),
+                       MakeStringView(original.localizedDescription));
+    }
+
+    error = error.userInfo[NSUnderlyingErrorKey];
+  }
+
+  return Status{FirestoreErrorCode::Unknown,
+                StringFormat("Unknown error: %s", original)};
+}
+
+}  // namespace util
+}  // namespace firestore
+}  // namespace firebase