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