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 = 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