test: Add tests for tchar.h routines

test/tchar.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025 Martin Storsjo
+ *
+ * This file is part of llvm-mingw.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef UNICODE
+#define _UNICODE
+#endif
+
+#include <stdio.h>
+#include <tchar.h>
+
+int _tmain(int argc, TCHAR* argv[]) {
+    _tprintf(_T("_tprintf\n"));
+    _ftprintf(stdout, _T("_ftprintf\n"));
+
+    TCHAR buffer[100];
+    _stprintf(buffer, _T("foo %d"), 123);
+    if (_tcscmp(buffer, _T("foo 123"))) {
+        _tprintf(_T("incorrect _stprintf output\n"));
+        return 1;
+    }
+    _stprintf(buffer, _T("str %s"), _T("arg"));
+    if (_tcscmp(buffer, _T("str arg"))) {
+        _tprintf(_T("incorrect _stprintf output for %%s\n"));
+        return 1;
+    }
+
+    int val;
+    if (_stscanf(_T("123"), _T("%d"), &val) != 1 || val != 123) {
+        _tprintf(_T("incorrect _stscanf output\n"));
+        return 1;
+    }
+
+    return 0;
+}