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-rw-r--r--libio/tst-bz22415.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/libio/tst-bz22415.c b/libio/tst-bz22415.c
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+++ b/libio/tst-bz22415.c
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+/* Check static buffer handling with setvbuf (BZ #22415)
+
+ Copyright (C) 2017-2018 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include <mcheck.h>
+
+#include <support/check.h>
+#include <support/temp_file.h>
+
+static int
+do_test (void)
+{
+ mtrace ();
+
+ char *temp_file;
+ TEST_VERIFY_EXIT (create_temp_file ("tst-bz22145.", &temp_file));
+
+ char buf[BUFSIZ];
+
+ {
+ /* Check if backup buffer is correctly freed and changing back
+ to normal buffer does not trigger an invalid free in case of
+ static buffer set by setvbuf. */
+
+ FILE *f = fopen (temp_file, "w+b");
+ TEST_VERIFY_EXIT (f != NULL);
+
+ TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
+ TEST_VERIFY_EXIT (ungetc ('x', f) == 'x');
+ TEST_VERIFY_EXIT (fseek (f, 0L, SEEK_SET) == 0);
+ TEST_VERIFY_EXIT (fputc ('y', f) == 'y');
+
+ TEST_VERIFY_EXIT (fclose (f) == 0);
+ }
+
+ {
+ /* Check if backup buffer is correctly freed and changing back
+ to normal buffer does not trigger an invalid free in case of
+ static buffer set by setvbuf. */
+
+ FILE *f = fopen (temp_file, "w+b");
+ TEST_VERIFY_EXIT (f != NULL);
+
+ TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
+ TEST_VERIFY_EXIT (ungetc ('x', f) == 'x');
+ TEST_VERIFY_EXIT (fputc ('y', f) == 'y');
+
+ TEST_VERIFY_EXIT (fclose (f) == 0);
+ }
+
+ {
+ FILE *f = fopen (temp_file, "w+b");
+ TEST_VERIFY_EXIT (f != NULL);
+
+ TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
+ TEST_VERIFY_EXIT (ungetwc (L'x', f) == L'x');
+ TEST_VERIFY_EXIT (fseek (f, 0L, SEEK_SET) == 0);
+ TEST_VERIFY_EXIT (fputwc (L'y', f) == L'y');
+
+ TEST_VERIFY_EXIT (fclose (f) == 0);
+ }
+
+ {
+ FILE *f = fopen (temp_file, "w+b");
+ TEST_VERIFY_EXIT (f != NULL);
+
+ TEST_VERIFY_EXIT (setvbuf (f, buf, _IOFBF, BUFSIZ) == 0);
+ TEST_VERIFY_EXIT (ungetwc (L'x', f) == L'x');
+ TEST_VERIFY_EXIT (fputwc (L'y', f) == L'y');
+
+ TEST_VERIFY_EXIT (fclose (f) == 0);
+ }
+
+ free (temp_file);
+
+ return 0;
+}
+
+#include <support/test-driver.c>