1 files changed, 44 insertions, 0 deletions
diff --git a/intl/components/src/ICU4CGlue.cpp b/intl/components/src/ICU4CGlue.cpp
new file mode 100644
index 0000000000..6b9e0c0c58
--- /dev/null
+++ b/intl/components/src/ICU4CGlue.cpp
@@ -0,0 +1,44 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/intl/ICU4CGlue.h"
+#include "unicode/uformattedvalue.h"
+
+namespace mozilla::intl {
+
+// Starting with ICU 59, UChar defaults to char16_t.
+static_assert(std::is_same_v<UChar, char16_t>,
+              "Gecko doesn't support redefining UChar to a different type");
+
+ICUError ToICUError(UErrorCode status) {
+  MOZ_ASSERT(!U_SUCCESS(status));
+  switch (status) {
+    case U_MEMORY_ALLOCATION_ERROR:
+      return ICUError::OutOfMemory;
+    default:
+      return ICUError::InternalError;
+  }
+}
+
+ICUResult ToICUResult(UErrorCode status) {
+  if (U_SUCCESS(status)) {
+    return Ok();
+  }
+  return Err(ToICUError(status));
+}
+
+// static
+Result<Span<const char16_t>, ICUError> FormattedResult::ToSpanImpl(
+    const UFormattedValue* value) {
+  UErrorCode status = U_ZERO_ERROR;
+  int32_t strLength;
+  const char16_t* str = ufmtval_getString(value, &strLength, &status);
+  if (U_FAILURE(status)) {
+    return Err(ToICUError(status));
+  }
+
+  return Span{str, AssertedCast<size_t>(strLength)};
+}
+
+}  // namespace mozilla::intl