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- /*
- * Copyright (c) 1983 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 3.11 (Berkeley) 6/6/90
- */
-
- #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 */
-