1 /* A "buffer" utility type.
2 Copyright (C) 1998, 2003 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 /* Written by Per Bothner <bothner@cygnus.com>, July 1998. */
22
23 #include "config.h"
24 #include "system.h"
25 #include "coretypes.h"
26 #include "tm.h"
27 #include "buffer.h"
28
29 /* Grow BUFP so there is room for at least SIZE more bytes. */
30
31 void
buffer_grow(struct buffer * bufp,int size)32 buffer_grow (struct buffer *bufp, int size)
33 {
34 if (bufp->limit - bufp->ptr >= size)
35 return;
36 if (bufp->data == 0)
37 {
38 if (size < 120)
39 size = 120;
40 bufp->data = xmalloc (size);
41 bufp->ptr = bufp->data;
42 }
43 else
44 {
45 int index = bufp->ptr - bufp->data;
46 size += 2 * (bufp->limit - bufp->data);
47 bufp->data = xrealloc (bufp->data, size);
48 bufp->ptr = bufp->data + index;
49 }
50 bufp->limit = bufp->data + size;
51 }
52