largefile: Add tests.

* tests/test-largefile.c: New file.
* modules/largefile-tests: New file.

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/test-largefile.c b/tests/test-largefile.c
new file mode 100644
index 0000000000..71ee7e942d
--- /dev/null
+++ b/tests/test-largefile.c
@@ -0,0 +1,47 @@
+/* Test of largefile module.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
+
+/* This test may fail if AC_SYS_LARGEFILE could not arrange for a 64-bit off_t.
+   This should be rare, though: only very old systems don't have support for
+   files larger than 2 GiB.  */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+int
+main (void)
+{
+  int result = 0;
+
+  /* Check the size of off_t.
+     With MSVC, this test succeeds only thanks to the 'sys_types' module.  */
+  if (sizeof (off_t) <= 4)
+    result |= 1;
+
+  /* Check the size of the 'struct stat' field 'st_size'.
+     With MSVC, this test succeeds only thanks to the 'sys_stat' module.  */
+  {
+    struct stat st;
+    if (sizeof (st.st_size) <= 4)
+      result |= 2;
+  }
+
+  return result;
+}