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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)context.h 8.1 (Berkeley) 6/6/93
*/
#include <stdio.h>
struct context {
struct context *x_link; /* nested contexts */
char x_type; /* tag for union */
union {
struct { /* input is a file */
char *X_filename; /* input file name */
FILE *X_fp; /* input stream */
short X_lineno; /* current line number */
char X_bol; /* at beginning of line */
char X_noerr; /* don't report errors */
struct ww *X_errwin; /* error window */
} x_f;
struct { /* input is a buffer */
char *X_buf; /* input buffer */
char *X_bufp; /* current position in buf */
struct value *X_arg; /* argument for alias */
int X_narg; /* number of arguments */
} x_b;
} x_un;
/* holding place for current token */
int x_token; /* the token */
struct value x_val; /* values associated with token */
/* parser error flags */
unsigned x_erred :1; /* had an error */
unsigned x_synerred :1; /* had syntax error */
unsigned x_abort :1; /* fatal error */
};
#define x_buf x_un.x_b.X_buf
#define x_bufp x_un.x_b.X_bufp
#define x_arg x_un.x_b.X_arg
#define x_narg x_un.x_b.X_narg
#define x_filename x_un.x_f.X_filename
#define x_fp x_un.x_f.X_fp
#define x_lineno x_un.x_f.X_lineno
#define x_bol x_un.x_f.X_bol
#define x_errwin x_un.x_f.X_errwin
#define x_noerr x_un.x_f.X_noerr
/* x_type values, 0 is reserved */
#define X_FILE 1 /* input is a file */
#define X_BUF 2 /* input is a buffer */
struct context cx; /* the current context */
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