1/*	$NetBSD: context.h,v 1.4 1998/10/14 00:58:47 wsanchez Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)context.h	8.1 (Berkeley) 6/6/93
35 */
36
37#include <stdio.h>
38
39#ifndef EXTERN
40#define EXTERN extern
41#endif
42
43struct context {
44	struct context *x_link;		/* nested contexts */
45	char x_type;			/* tag for union */
46	union {
47		struct {	/* input is a file */
48			char *X_filename;	/* input file name */
49			FILE *X_fp;		/* input stream */
50			short X_lineno;		/* current line number */
51			char X_bol;		/* at beginning of line */
52			char X_noerr;		/* don't report errors */
53			struct ww *X_errwin;	/* error window */
54		} x_f;
55		struct {	/* input is a buffer */
56			char *X_buf;		/* input buffer */
57			char *X_bufp;		/* current position in buf */
58			struct value *X_arg;	/* argument for alias */
59			int X_narg;		/* number of arguments */
60		} x_b;
61	} x_un;
62		/* holding place for current token */
63	int x_token;			/* the token */
64	struct value x_val;		/* values associated with token */
65		/* parser error flags */
66	unsigned x_erred :1;		/* had an error */
67	unsigned x_synerred :1;		/* had syntax error */
68	unsigned x_abort :1;		/* fatal error */
69};
70#define x_buf		x_un.x_b.X_buf
71#define x_bufp		x_un.x_b.X_bufp
72#define x_arg		x_un.x_b.X_arg
73#define x_narg		x_un.x_b.X_narg
74#define x_filename	x_un.x_f.X_filename
75#define x_fp		x_un.x_f.X_fp
76#define x_lineno	x_un.x_f.X_lineno
77#define x_bol		x_un.x_f.X_bol
78#define x_errwin	x_un.x_f.X_errwin
79#define x_noerr		x_un.x_f.X_noerr
80
81	/* x_type values, 0 is reserved */
82#define X_FILE		1		/* input is a file */
83#define X_BUF		2		/* input is a buffer */
84
85EXTERN struct context cx;			/* the current context */
86