1 /* $OpenBSD: context.h,v 1.4 2003/06/03 02:56:23 millert Exp $ */ 2 /* $NetBSD: context.h,v 1.3 1995/09/28 10:34:17 tls Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Edward Wang at The University of California, Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)context.h 8.1 (Berkeley) 6/6/93 36 */ 37 38 #include <stdio.h> 39 40 struct context { 41 struct context *x_link; /* nested contexts */ 42 char x_type; /* tag for union */ 43 union { 44 struct { /* input is a file */ 45 char *X_filename; /* input file name */ 46 FILE *X_fp; /* input stream */ 47 short X_lineno; /* current line number */ 48 char X_bol; /* at beginning of line */ 49 char X_noerr; /* don't report errors */ 50 struct ww *X_errwin; /* error window */ 51 } x_f; 52 struct { /* input is a buffer */ 53 char *X_buf; /* input buffer */ 54 char *X_bufp; /* current position in buf */ 55 struct value *X_arg; /* argument for alias */ 56 int X_narg; /* number of arguments */ 57 } x_b; 58 } x_un; 59 /* holding place for current token */ 60 int x_token; /* the token */ 61 struct value x_val; /* values associated with token */ 62 /* parser error flags */ 63 unsigned x_erred :1; /* had an error */ 64 unsigned x_synerred :1; /* had syntax error */ 65 unsigned x_abort :1; /* fatal error */ 66 }; 67 #define x_buf x_un.x_b.X_buf 68 #define x_bufp x_un.x_b.X_bufp 69 #define x_arg x_un.x_b.X_arg 70 #define x_narg x_un.x_b.X_narg 71 #define x_filename x_un.x_f.X_filename 72 #define x_fp x_un.x_f.X_fp 73 #define x_lineno x_un.x_f.X_lineno 74 #define x_bol x_un.x_f.X_bol 75 #define x_errwin x_un.x_f.X_errwin 76 #define x_noerr x_un.x_f.X_noerr 77 78 /* x_type values, 0 is reserved */ 79 #define X_FILE 1 /* input is a file */ 80 #define X_BUF 2 /* input is a buffer */ 81 82 struct context cx; /* the current context */ 83