window/context.h

   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 */