gcc/java/buffer.c

   1 /* A "buffer" utility type.
   2    Copyright (C) 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC 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 GNU CC 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 GNU CC; 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 "buffer.h"
  26
  27 /* Grow BUFP so there is room for at least SIZE more bytes. */
  28
  29 void
  30 buffer_grow (bufp, size)
  31      struct buffer *bufp;
  32      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 = (unsigned char*) 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 = (unsigned char *) xrealloc (bufp->data, size);
  48       bufp->ptr = bufp->data + index;
  49     }
  50   bufp->limit = bufp->data + size;
  51 }