1  /* Test iconv buffer handling with the IGNORE error handler.
       2     Copyright (C) 2019-2023 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>