/* * 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 are permitted provided * that: (1) source distributions retain this entire copyright notice and * comment, and (2) distributions including binaries display the following * acknowledgement: ``This product includes software developed by the * University of California, Berkeley and its contributors'' in the * documentation or other materials provided with the distribution and in * all advertising materials mentioning features or use of this software. * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * @(#)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 */