malloc/scratch_buffer_dupfree.c

   1 /* Variable-sized buffer with on-stack default allocation.
   2    Copyright (C) 2020-2022 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)