1  /* Increase the size of a dynamic array and clear the new part.
       2     Copyright (C) 2017-2023 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 <dynarray.h>
      20  #include <string.h>
      21  
      22  bool
      23  __libc_dynarray_resize_clear (struct dynarray_header *list, size_t size,
      24                                void *scratch, size_t element_size)
      25  {
      26    size_t old_size = list->used;
      27    if (!__libc_dynarray_resize (list, size, scratch, element_size))
      28      return false;
      29    /* __libc_dynarray_resize already checked for overflow.  */
      30    char *array = list->array;
      31    memset (array + (old_size * element_size), 0,
      32            (size - old_size) * element_size);
      33    return true;
      34  }
      35  libc_hidden_def (__libc_dynarray_resize_clear)