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-rw-r--r--src/lib/icu/Collate.cxx26
1 files changed, 26 insertions, 0 deletions
diff --git a/src/lib/icu/Collate.cxx b/src/lib/icu/Collate.cxx
index ddb6313d6..902192c06 100644
--- a/src/lib/icu/Collate.cxx
+++ b/src/lib/icu/Collate.cxx
@@ -37,6 +37,12 @@
#include <ctype.h>
#endif
+#ifdef WIN32
+#include "Win32.hxx"
+#include "util/AllocatedString.hxx"
+#include <windows.h>
+#endif
+
#include <assert.h>
#include <string.h>
#include <strings.h>
@@ -107,6 +113,26 @@ IcuCollate(const char *a, const char *b)
return result;
#endif
+#elif defined(WIN32)
+ const auto wa = MultiByteToWideChar(CP_UTF8, a);
+ const auto wb = MultiByteToWideChar(CP_UTF8, b);
+ if (wa.IsNull())
+ return wb.IsNull() ? 0 : -1;
+ else if (wb.IsNull())
+ return 1;
+
+ auto result = CompareStringEx(LOCALE_NAME_INVARIANT,
+ LINGUISTIC_IGNORECASE,
+ wa.c_str(), -1,
+ wb.c_str(), -1,
+ nullptr, nullptr, 0);
+ if (result != 0)
+ /* "To maintain the C runtime convention of comparing
+ strings, the value 2 can be subtracted from a
+ nonzero return value." */
+ result -= 2;
+
+ return result;
#elif defined(HAVE_GLIB)
return g_utf8_collate(a, b);
#else