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Commit	Line	Data
	1	/* $NetBSD: context.h,v 1.3 1995/09/28 10:34:17 tls 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. All advertising materials mentioning features or use of this software
	19	* must display the following acknowledgement:
	20	* This product includes software developed by the University of
	21	* California, Berkeley and its contributors.
	22	* 4. Neither the name of the University nor the names of its contributors
	23	* may be used to endorse or promote products derived from this software
	24	* without specific prior written permission.
	25	*
	26	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	27	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	28	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	29	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	30	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	31	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	32	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	33	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	34	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	35	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	36	* SUCH DAMAGE.
	37	*
	38	* @(#)context.h 8.1 (Berkeley) 6/6/93
	39	*/
	40
	41	#include <stdio.h>
	42
	43	#ifndef EXTERN
	44	#define EXTERN extern
	45	#endif
	46
	47	struct context {
	48	struct context x_link; / nested contexts */
	49	char x_type; /* tag for union */
	50	union {
	51	struct { /* input is a file */
	52	char X_filename; / input file name */
	53	FILE X_fp; / input stream */
	54	short X_lineno; /* current line number */
	55	char X_bol; /* at beginning of line */
	56	char X_noerr; /* don't report errors */
	57	struct ww X_errwin; / error window */
	58	} x_f;
	59	struct { /* input is a buffer */
	60	char X_buf; / input buffer */
	61	char X_bufp; / current position in buf */
	62	struct value X_arg; / argument for alias */
	63	int X_narg; /* number of arguments */
	64	} x_b;
	65	} x_un;
	66	/* holding place for current token */
	67	int x_token; /* the token */
	68	struct value x_val; /* values associated with token */
	69	/* parser error flags */
	70	unsigned x_erred :1; /* had an error */
	71	unsigned x_synerred :1; /* had syntax error */
	72	unsigned x_abort :1; /* fatal error */
	73	};
	74	#define x_buf x_un.x_b.X_buf
	75	#define x_bufp x_un.x_b.X_bufp
	76	#define x_arg x_un.x_b.X_arg
	77	#define x_narg x_un.x_b.X_narg
	78	#define x_filename x_un.x_f.X_filename
	79	#define x_fp x_un.x_f.X_fp
	80	#define x_lineno x_un.x_f.X_lineno
	81	#define x_bol x_un.x_f.X_bol
	82	#define x_errwin x_un.x_f.X_errwin
	83	#define x_noerr x_un.x_f.X_noerr
	84
	85	/* x_type values, 0 is reserved */
	86	#define X_FILE 1 /* input is a file */
	87	#define X_BUF 2 /* input is a buffer */
	88
	89	EXTERN struct context cx; /* the current context */