1  /* Test the wcslcpy function.
       2     Copyright (C) 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 <array_length.h>
      20  #include <stdio.h>
      21  #include <stdlib.h>
      22  #include <support/check.h>
      23  #include <wchar.h>
      24  
      25  static int
      26  do_test (void)
      27  {
      28    struct {
      29      wchar_t buf1[16];
      30      wchar_t buf2[16];
      31    } s;
      32  
      33    /* Nothing is written to the destination if its size is 0.  */
      34    wmemset (s.buf1, '@', array_length (s.buf1));
      35    wmemset (s.buf2, '@', array_length (s.buf2));
      36    TEST_COMPARE (wcslcpy (s.buf1, L"Hello!", 0), 6);
      37    TEST_COMPARE_BLOB (&s, sizeof (s), L"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
      38  
      39    /* No bytes are are modified in the target buffer if the source
      40       string is short enough.  */
      41    wmemset (s.buf1, '@', array_length (s.buf1));
      42    wmemset (s.buf2, '@', array_length (s.buf2));
      43    TEST_COMPARE (wcslcpy (s.buf1, L"Hello!", array_length (s.buf1)), 6);
      44    TEST_COMPARE_BLOB (&s, sizeof (s),
      45                       L"Hello!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
      46  
      47    /* A source string which fits exactly into the destination buffer is
      48       not truncated.  */
      49    wmemset (s.buf1, '@', array_length (s.buf1));
      50    wmemset (s.buf2, '@', array_length (s.buf2));
      51    TEST_COMPARE (wcslcpy (s.buf1, L"Hello, world!!!", array_length (s.buf1)),
      52                  15);
      53    TEST_COMPARE_BLOB (&s, sizeof (s),
      54                       L"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
      55  
      56    /* A source string one character longer than the destination buffer
      57       is truncated by one character.  The untruncated source length is
      58       returned.  */
      59    wmemset (s.buf1, '@', array_length (s.buf1));
      60    wmemset (s.buf2, '@', array_length (s.buf2));
      61    TEST_COMPARE (wcslcpy (s.buf1, L"Hello, world!!!!", array_length (s.buf1)),
      62                  16);
      63    TEST_COMPARE_BLOB (&s, sizeof (s),
      64                       L"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
      65  
      66    /* An even longer source string is truncated as well, and the
      67       original length is returned.  */
      68    wmemset (s.buf1, '@', array_length (s.buf1));
      69    wmemset (s.buf2, '@', array_length (s.buf2));
      70    TEST_COMPARE (wcslcpy (s.buf1, L"Hello, world!!!!!!!!",
      71                           array_length (s.buf1)), 20);
      72    TEST_COMPARE_BLOB (&s, sizeof (s),
      73                       L"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
      74  
      75    return 0;
      76  }
      77  
      78  #include <support/test-driver.c>