1  /* Copy the dynamically-allocated area to an explicitly-sized heap allocation.
       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  #ifndef _LIBC
      20  # include <libc-config.h>
      21  #endif
      22  
      23  #include <dynarray.h>
      24  #include <stdlib.h>
      25  #include <string.h>
      26  
      27  bool
      28  __libc_dynarray_finalize (struct dynarray_header *list,
      29                            void *scratch, size_t element_size,
      30                            struct dynarray_finalize_result *result)
      31  {
      32    if (__dynarray_error (list))
      33      /* The caller will reported the deferred error.  */
      34      return false;
      35  
      36    size_t used = list->used;
      37  
      38    /* Empty list.  */
      39    if (used == 0)
      40      {
      41        /* An empty list could still be backed by a heap-allocated
      42           array.  Free it if necessary.  */
      43        if (list->array != scratch)
      44          free (list->array);
      45        *result = (struct dynarray_finalize_result) { NULL, 0 };
      46        return true;
      47      }
      48  
      49    size_t allocation_size = used * element_size;
      50    void *heap_array = malloc (allocation_size);
      51    if (heap_array != NULL)
      52      {
      53        /* The new array takes ownership of the strings.  */
      54        if (list->array != NULL)
      55          memcpy (heap_array, list->array, allocation_size);
      56        if (list->array != scratch)
      57          free (list->array);
      58        *result = (struct dynarray_finalize_result)
      59          { .array = heap_array, .length = used };
      60        return true;
      61      }
      62    else
      63      /* The caller will perform the freeing operation.  */
      64      return false;
      65  }
      66  libc_hidden_def (__libc_dynarray_finalize)