1 /* A "buffer" utility type. 2 Copyright (C) 1998, 2000 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 /* 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 PARAMS ((struct buffer*, int)); 47