tests: replace fgets by xfgets

With fortification enabled, fgets calls return result needs to be checked,
has it gets the __wur macro enabled.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/support/xfgets.c b/support/xfgets.c
new file mode 100644
index 0000000000..14f98dee1b
--- /dev/null
+++ b/support/xfgets.c
@@ -0,0 +1,32 @@
+/* fgets with error checking.
+   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 <support/xstdio.h>
+
+#include <support/check.h>
+#include <stdlib.h>
+
+char *
+xfgets (char *s, int size, FILE *stream)
+{
+  char *ret = fgets (s, size, stream);
+  if (!ret && ferror(stream))
+    FAIL_EXIT1 ("fgets failed: %m");
+
+  return ret;
+}