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/* A "buffer" utility type.

   Copyright (C) 1998, 2003 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GCC 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 General Public License for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING.  If not, write to

the Free Software Foundation, 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

/* Written by Per Bothner <bothner@cygnus.com>, July 1998. */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "buffer.h"

/* Grow BUFP so there is room for at least SIZE more bytes. */

void

buffer_grow (struct buffer *bufp, int size)

{

  if (bufp->limit - bufp->ptr >= size)

    return;

  if (bufp->data == 0)

    {

      if (size < 120)

        size = 120;

      bufp->data = xmalloc (size);

      bufp->ptr = bufp->data;

    }

  else

    {

      int index = bufp->ptr - bufp->data;

      size += 2 * (bufp->limit - bufp->data);

      bufp->data = xrealloc (bufp->data, size);

      bufp->ptr = bufp->data + index;

    }

  bufp->limit = bufp->data + size;

}