getdelim: ensure error indicator is set on error (bug 29917)

POSIX requires that getdelim and getline set the error indicator on the
stream when an error occured, in addition to setting errno.

1 files changed, 36 insertions, 0 deletions

diff --git a/libio/tst-getdelim.c b/libio/tst-getdelim.c
new file mode 100644
index 0000000000..4443732669
--- /dev/null
+++ b/libio/tst-getdelim.c
@@ -0,0 +1,36 @@
+/* Check that getdelim sets error indicator on error (BZ #29917)
+
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  clearerr (stdin);
+  TEST_VERIFY (getdelim (0, 0, '\n', stdin) == -1);
+  TEST_VERIFY (ferror (stdin) != 0);
+  TEST_VERIFY (errno == EINVAL);
+
+  return 0;
+}
+
+#include <support/test-driver.c>