reference: Fix creation of references with extended ASCII characters in their name

src/fileops.c

@@ -62,7 +62,18 @@ int git_futils_creat_withpath(const char *path, const mode_t dirmode, const mode
 
 int git_futils_creat_locked(const char *path, const mode_t mode)
 {
-	int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
+	int fd;
+
+#ifdef GIT_WIN32
+	wchar_t* buf;
+
+	buf = gitwin_to_utf16(path);
+	fd = _wopen(buf, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
+	git__free(buf);
+#else
+	fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
+#endif
+
 	if (fd < 0) {
 		giterr_set(GITERR_OS, "Failed to create locked file '%s'", path);
 		return -1;

tests-clar/refs/unicode.c

+#include "clar_libgit2.h"
+
+static git_repository *repo;
+
+void test_refs_unicode__initialize(void)
+{
+	cl_fixture_sandbox("testrepo.git");
+
+	cl_git_pass(git_repository_open(&repo, "testrepo.git"));
+}
+
+void test_refs_unicode__cleanup(void)
+{
+	git_repository_free(repo);
+	cl_fixture_cleanup("testrepo.git");
+}
+
+void test_refs_unicode__create_and_lookup(void)
+{
+	git_reference *ref, *ref2;
+	git_repository *repo2;
+
+	const char *REFNAME = "refs/heads/" "\305" "ngstr" "\366" "m";
+	const char *master = "refs/heads/master";
+
+	/* Create the reference */
+	cl_git_pass(git_reference_lookup(&ref, repo, master));
+	cl_git_pass(git_reference_create_oid(&ref, repo, REFNAME, git_reference_oid(ref), 0));
+	cl_assert(strcmp(REFNAME, git_reference_name(ref)) == 0);
+
+	/* Lookup the reference in a different instance of the repository */
+	cl_git_pass(git_repository_open(&repo2, "testrepo.git"));
+	cl_git_pass(git_reference_lookup(&ref2, repo2, REFNAME));
+
+	cl_assert(git_oid_cmp(git_reference_oid(ref), git_reference_oid(ref2)) == 0);
+	cl_assert(strcmp(REFNAME, git_reference_name(ref2)) == 0);
+
+	git_reference_free(ref);
+	git_reference_free(ref2);
+	git_repository_free(repo2);
+}