1  /* Variable-sized buffer with on-stack default allocation.
       2     Copyright (C) 2020-2021 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 <scratch_buffer.h>
      24  #include <string.h>
      25  
      26  void *
      27  __libc_scratch_buffer_dupfree (struct scratch_buffer *buffer, size_t size)
      28  {
      29    void *data = buffer->data;
      30    if (data == buffer->__space.__c)
      31      {
      32        void *copy = malloc (size);
      33        return copy != NULL ? memcpy (copy, data, size) : NULL;
      34      }
      35    else
      36      {
      37        void *copy = realloc (data, size);
      38        return copy != NULL ? copy : data;
      39      }
      40  }
      41  libc_hidden_def (__libc_scratch_buffer_dupfree)