wcsmbs/tst-wcslcpy.c

   1 /* Test the wcslcpy function.
   2    Copyright (C) 2023-2024 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>