gcc/java/buffer.h

   1 /* A "buffer" utility type.
   2    Copyright (C) 1998, 2000, 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 /* A simple data structure for an expandable buffer. */
  24
  25 struct buffer
  26 {
  27   /* The start of the actual data buffer. */
  28   unsigned char *data;
  29
  30   /* Where to write next in the buffer. */
  31   unsigned char *ptr;
  32
  33   /* The end of the allocated data buffer. */
  34   unsigned char *limit;
  35 };
  36
  37 #define NULL_BUFFER { (void*) 0, (void*) 0, (void*) 0 }
  38
  39 #define BUFFER_INIT(BUFP) \
  40   ((BUFP)->data = NULL, (BUFP)->ptr = NULL, (BUFP)->limit = NULL)
  41
  42 #define BUFFER_LENGTH(BUFP) ((BUFP)->ptr - (BUFP)->data)
  43
  44 #define BUFFER_RESET(BUFP) ((BUFP)->ptr = (BUFP)->data)
  45
  46 extern void buffer_grow (struct buffer*, int);