iconv/tst-iconv7.c

   1 /* Test iconv buffer handling with the IGNORE error handler.
   2    Copyright (C) 2019-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* Derived from BZ #18830 */
  20 #include <errno.h>
  21 #include <iconv.h>
  22 #include <stdio.h>
  23 #include <support/check.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28   /* This conversion needs two steps, from ASCII to INTERNAL to ASCII.  */
  29   iconv_t cd = iconv_open ("ASCII//IGNORE", "ASCII");
  30   TEST_VERIFY_EXIT (cd != (iconv_t) -1);
  31
  32   /* Convert some irreversible sequence, enough to trigger an overflow of
  33      the output buffer before the irreversible character in the second
  34      step, but after going past the irreversible character in the first
  35      step.  */
  36   char input[4 + 4] = { '0', '1', '2', '3', '4', '5', '\266', '7' };
  37   char *inptr = input;
  38   size_t insize = sizeof (input);
  39   char output[4];
  40   char *outptr = output;
  41   size_t outsize = sizeof (output);
  42
  43   /* The conversion should fail.  */
  44   TEST_VERIFY (iconv (cd, &inptr, &insize, &outptr, &outsize) == (size_t) -1);
  45   TEST_VERIFY (errno == E2BIG);
  46   /* The conversion should not consume more than it was able to store in
  47      the output buffer.  */
  48   TEST_COMPARE (inptr - input, sizeof (output) - outsize);
  49
  50   TEST_VERIFY_EXIT (iconv_close (cd) != -1);
  51
  52   return 0;
  53 }
  54
  55 #include <support/test-driver.c>