1 files changed, 55 insertions, 0 deletions
diff --git a/iconv/tst-iconv7.c b/iconv/tst-iconv7.c
new file mode 100644
index 0000000000..735d5b439e
--- /dev/null
+++ b/iconv/tst-iconv7.c
@@ -0,0 +1,55 @@
+/* Test iconv buffer handling with the IGNORE error handler.
+   Copyright (C) 2019 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/>.  */
+
+/* Derived from BZ #18830 */
+#include <errno.h>
+#include <iconv.h>
+#include <stdio.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  /* This conversion needs two steps, from ASCII to INTERNAL to ASCII.  */
+  iconv_t cd = iconv_open ("ASCII//IGNORE", "ASCII");
+  TEST_VERIFY_EXIT (cd != (iconv_t) -1);
+
+  /* Convert some irreversible sequence, enough to trigger an overflow of
+     the output buffer before the irreversible character in the second
+     step, but after going past the irreversible character in the first
+     step.  */
+  char input[4 + 4] = { '0', '1', '2', '3', '4', '5', '\266', '7' };
+  char *inptr = input;
+  size_t insize = sizeof (input);
+  char output[4];
+  char *outptr = output;
+  size_t outsize = sizeof (output);
+
+  /* The conversion should fail.  */
+  TEST_VERIFY (iconv (cd, &inptr, &insize, &outptr, &outsize) == (size_t) -1);
+  TEST_VERIFY (errno == E2BIG);
+  /* The conversion should not consume more than it was able to store in
+     the output buffer.  */
+  TEST_COMPARE (inptr - input, sizeof (output) - outsize);
+
+  TEST_VERIFY_EXIT (iconv_close (cd) != -1);
+
+  return 0;
+}
+
+#include <support/test-driver.c>