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