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