1  /* Test basic mbstowcs including wstring == NULL (Bug 25219).
       2     Copyright (C) 2020-2023 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  #include <stdlib.h>
      20  #include <string.h>
      21  #include <support/check.h>
      22  
      23  static int
      24  do_test (void)
      25  {
      26    char string[] = { '1', '2', '3' , '4', '5', '\0' };
      27    size_t len = strlen (string);
      28    wchar_t wstring[] = { L'1', L'2', L'3', L'4', L'5', L'\0' };
      29  #define NUM_WCHAR 6
      30    wchar_t wout[NUM_WCHAR];
      31    size_t result;
      32  
      33    /* The input ASCII string in the C/POSIX locale must convert
      34       to the matching WSTRING.  */
      35    result = mbstowcs (wout, string, NUM_WCHAR);
      36    TEST_VERIFY (result == (NUM_WCHAR - 1));
      37    TEST_COMPARE_BLOB (wstring, sizeof (wchar_t) * (NUM_WCHAR - 1),
      38  		     wout, sizeof (wchar_t) * result);
      39  
      40    /* The input ASCII string in the C/POSIX locale must be the
      41       same length when using mbstowcs to compute the length of
      42       the string required in the conversion.  Using mbstowcs
      43       in this way is an XSI extension to POSIX.  */
      44    result = mbstowcs (NULL, string, len);
      45    TEST_VERIFY (result == len);
      46  
      47    return 0;
      48  }
      49  
      50  #include <support/test-driver.c>