feat: add dependency

javascript-engine/external/iana-time-zone/haiku/src/implementation.cc

@@ -0,0 +1,66 @@
+#include "iana-time-zone-haiku/src/interface.h"
+#include "iana-time-zone-haiku/src/lib.rs.h"
+
+#ifdef __HAIKU__
+
+#include <cstring>
+
+#include <Errors.h>
+#include <LocaleRoster.h>
+#include <String.h>
+#include <TimeZone.h>
+
+namespace iana_time_zone_haiku {
+size_t get_tz(rust::Slice<uint8_t> buf) {
+    try {
+        static_assert(sizeof(char) == sizeof(uint8_t), "Illegal char size");
+
+        if (buf.empty()) {
+            return 0;
+        }
+
+        // `BLocaleRoster::Default()` returns a reference to a statically allocated object.
+        // https://github.com/haiku/haiku/blob/8f16317/src/kits/locale/LocaleRoster.cpp#L143-L147
+        BLocaleRoster *locale_roster(BLocaleRoster::Default());
+        if (!locale_roster) {
+            return 0;
+        }
+
+        BTimeZone tz(NULL, NULL);
+        if (locale_roster->GetDefaultTimeZone(&tz) != B_OK) {
+            return 0;
+        }
+
+        BString bname(tz.ID());
+        int32_t ilength(bname.Length());
+        if (ilength <= 0) {
+            return 0;
+        }
+
+        size_t length(ilength);
+        if (length > buf.size()) {
+            return 0;
+        }
+
+        // BString::String() returns a borrowed string.
+        // https://www.haiku-os.org/docs/api/classBString.html#ae4fe78b06c8e3310093b80305e14ba87
+        const char *sname(bname.String());
+        if (!sname) {
+            return 0;
+        }
+
+        std::memcpy(buf.data(), sname, length);
+        return length;
+    } catch (...) {
+        return 0;
+    }
+}
+}  // namespace iana_time_zone_haiku
+
+#else
+
+namespace iana_time_zone_haiku {
+size_t get_tz(rust::Slice<uint8_t>) { return 0; }
+}  // namespace iana_time_zone_haiku
+
+#endif