kc3-lang/gnulib/lib/malloc/scratch_buffer_grow.c

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• Hash : 281b825e
  Author :
  Date : 2018-01-01T00:57:25
  

  maint: Run 'make update-copyright'
  

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• lib/malloc/scratch_buffer_grow.c

• /* Variable-sized buffer with on-stack default allocation.
     Copyright (C) 2015-2018 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <https://www.gnu.org/licenses/>.  */
  
  #ifndef _LIBC
  # include <libc-config.h>
  #endif
  
  #include <scratch_buffer.h>
  #include <errno.h>
  
  bool
  __libc_scratch_buffer_grow (struct scratch_buffer *buffer)
  {
    void *new_ptr;
    size_t new_length = buffer->length * 2;
  
    /* Discard old buffer.  */
    scratch_buffer_free (buffer);
  
    /* Check for overflow.  */
    if (__glibc_likely (new_length >= buffer->length))
      new_ptr = malloc (new_length);
    else
      {
        __set_errno (ENOMEM);
        new_ptr = NULL;
      }
  
    if (__glibc_unlikely (new_ptr == NULL))
      {
        /* Buffer must remain valid to free.  */
        scratch_buffer_init (buffer);
        return false;
      }
  
    /* Install new heap-based buffer.  */
    buffer->data = new_ptr;
    buffer->length = new_length;
    return true;
  }
  libc_hidden_def (__libc_scratch_buffer_grow)
  

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