nsparser.y

Newlib 嵌入式 C库 标准实现代码

%{
/*	$NetBSD: nsparser.y,v 1.3 1999/01/25 00:16:18 lukem Exp $	*/

/*-
 * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn.
 *
 * 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 NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid =
  "$FreeBSD: src/lib/libc/net/nsparser.y,v 1.3 2002/03/21 22:47:17 obrien Exp $";
#endif /* LIBC_SCCS and not lint */

#define _NS_PRIVATE
#include <nsswitch.h>
#include <stdio.h>
#include <string.h>


static	void	_nsaddsrctomap(const char *);

static	ns_dbt		curdbt;
static	ns_src		cursrc;
%}

%union {
	char *str;
	int   mapval;
}

%token	NL
%token	SUCCESS UNAVAIL NOTFOUND TRYAGAIN
%token	RETURN CONTINUE
%token	<str> STRING

%type	<mapval> Status Action

%%

File
	:	/* empty */
	| Lines
	;

Lines
	: Entry
	| Lines Entry
	;

Entry
	: NL
	| Database ':' NL
	| Database ':' Srclist NL
		{
			_nsdbtput(&curdbt);
		}
	| error NL
		{
			yyerrok;
		}
	;

Database
	: STRING
		{
			curdbt.name = yylval.str;
			curdbt.srclist = NULL;
			curdbt.srclistsize = 0;
		}
	;

Srclist
	: Item
	| Srclist Item
	;

Item
	: STRING
		{
			cursrc.flags = NS_SUCCESS;
			_nsaddsrctomap($1);
		}
	| STRING '[' { cursrc.flags = NS_SUCCESS; } Criteria ']'
		{
			_nsaddsrctomap($1);
		}
	;

Criteria
	: Criterion
	| Criteria Criterion
	;

Criterion
	: Status '=' Action
		{
			if ($3)		/* if action == RETURN set RETURN bit */
				cursrc.flags |= $1;  
			else		/* else unset it */
				cursrc.flags &= ~$1;
		}
	;

Status
	: SUCCESS	{ $$ = NS_SUCCESS; }
	| UNAVAIL	{ $$ = NS_UNAVAIL; }
	| NOTFOUND	{ $$ = NS_NOTFOUND; }
	| TRYAGAIN	{ $$ = NS_TRYAGAIN; }
	;

Action
	: RETURN	{ $$ = 1L; }
	| CONTINUE	{ $$ = 0L; }
	;

%%

static void
_nsaddsrctomap(elem)
	const char *elem;
{
	int		i, lineno;
	extern int	_nsyylineno;
	extern char *	_nsyytext;

	lineno = _nsyylineno - (*_nsyytext == '\n' ? 1 : 0);
	if (curdbt.srclistsize > 0) {
		if ((strcasecmp(elem, NSSRC_COMPAT) == 0) ||
		    (strcasecmp(curdbt.srclist[0].name, NSSRC_COMPAT) == 0)) {
				/* XXX: syslog the following */
			printf("line %d 'compat' used with other sources",
			    lineno);
			return;
		}
	}
	for (i = 0; i < curdbt.srclistsize; i++) {
		if (strcasecmp(curdbt.srclist[i].name, elem) == 0) {
				/* XXX: syslog the following */
			printf("%s line %d: duplicate source '%s'",
			    lineno, elem);
			return;
		}
	}
	cursrc.name = elem;
	_nsdbtaddsrc(&curdbt, &cursrc);
}