yyerror.c

早期freebsd实现

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)yyerror.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include "whoami.h"
#include "0.h"
#include "tree_ty.h"	/* must be included for yy.h */
#include "yy.h"

/*
 * Yerror prints an error
 * message and then returns
 * NIL for the tree if needed.
 * The error is flagged on the
 * current line which is printed
 * if the listing is turned off.
#ifdef PXP
 *
 * As is obvious from the fooling around
 * with fout below, the Pascal system should
 * be changed to use the new library "lS".
#endif
 */
/*VARARGS*/
yerror(s, a1, a2, a3, a4, a5)
	char *s;
	char *a1, *a2, *a3, *a4, *a5;
{
#ifdef PI
	char buf[256];
#endif
	register int i;
	static yySerrs;
#ifdef PXP
	int ofout;
#endif

	if (errpfx == 'w' && opt('w') != 0) {
		errpfx = 'E';
		return;
	}
	/* no continuations allowed here */
	if (errpfx == ' ')
		errpfx = 'E';
#ifdef PXP
	flush();
	ofout = fout[0];
	fout[0] = errout;
#endif
	yyResume = 0;
#ifdef PI
	geterr((int) s, buf);
	s = buf;
#endif
	yysync();
	pchr(errpfx);
	pchr(' ');
	for (i = 3; i < yyecol; i++)
		pchr('-');
	printf("^--- ");
/*
	if (yyecol > 60)
		printf("\n\t");
*/
	printf(s, a1, a2, a3, a4, a5);
	pchr('\n');
	if (errpfx == 'E')
#ifdef PI
		eflg = TRUE, codeoff();
#endif
#ifdef PXP
		eflg = TRUE;
#endif
	errpfx = 'E';
	yySerrs++;
	if (yySerrs >= MAXSYNERR) {
		yySerrs = 0;
		yerror("Too many syntax errors - QUIT");
		pexit(ERRS);
	}
#ifdef PXP
	flush();
	fout[0] = ofout;
	return (0);
#endif
}

/*
 * A bracketing error message
 */
brerror(where, what)
	int where;
	char *what;
{

	if (where == 0) {
		line = yyeline;
		setpfx(' ');
		error("End matched %s on line %d", what, (char *) where);
		return;
	}
	if (where < 0)
		where = -where;
	yerror("Inserted keyword end matching %s on line %d", what, (char *) where);
}