1 /* $NetBSD: context.h,v 1.5 2003/08/07 11:17:25 agc 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)context.h 8.1 (Berkeley) 6/6/93 35 */ 36 37 #include <stdio.h> 38 39 #ifndef EXTERN 40 #define EXTERN extern 41 #endif 42 43 struct context { 44 struct context *x_link; /* nested contexts */ 45 char x_type; /* tag for union */ 46 union { 47 struct { /* input is a file */ 48 char *X_filename; /* input file name */ 49 FILE *X_fp; /* input stream */ 50 short X_lineno; /* current line number */ 51 char X_bol; /* at beginning of line */ 52 char X_noerr; /* don't report errors */ 53 struct ww *X_errwin; /* error window */ 54 } x_f; 55 struct { /* input is a buffer */ 56 char *X_buf; /* input buffer */ 57 char *X_bufp; /* current position in buf */ 58 struct value *X_arg; /* argument for alias */ 59 int X_narg; /* number of arguments */ 60 } x_b; 61 } x_un; 62 /* holding place for current token */ 63 int x_token; /* the token */ 64 struct value x_val; /* values associated with token */ 65 /* parser error flags */ 66 unsigned x_erred :1; /* had an error */ 67 unsigned x_synerred :1; /* had syntax error */ 68 unsigned x_abort :1; /* fatal error */ 69 }; 70 #define x_buf x_un.x_b.X_buf 71 #define x_bufp x_un.x_b.X_bufp 72 #define x_arg x_un.x_b.X_arg 73 #define x_narg x_un.x_b.X_narg 74 #define x_filename x_un.x_f.X_filename 75 #define x_fp x_un.x_f.X_fp 76 #define x_lineno x_un.x_f.X_lineno 77 #define x_bol x_un.x_f.X_bol 78 #define x_errwin x_un.x_f.X_errwin 79 #define x_noerr x_un.x_f.X_noerr 80 81 /* x_type values, 0 is reserved */ 82 #define X_FILE 1 /* input is a file */ 83 #define X_BUF 2 /* input is a buffer */ 84 85 EXTERN struct context cx; /* the current context */ 86