unbound/util/configparser.y

/*
 * configparser.y -- yacc grammar for unbound configuration files
 *
 * Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
 *
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 * 
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 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.
 * 
 * Neither the name of the NLNET LABS 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 COPYRIGHT HOLDERS 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.
 */

%{
#include "config.h"

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>

#include "util/configyyrename.h"
#include "util/config_file.h"

int ub_c_lex(void);
void ub_c_error(const char *message);

/* these need to be global, otherwise they cannot be used inside yacc */
extern struct config_parser_state* cfg_parser;
static int server_settings_seen = 0;

#if 0
#define OUTYY(s)  printf s /* used ONLY when debugging */
#else
#define OUTYY(s)
#endif

%}
%union {
	char*	str;
}

%token SPACE LETTER NEWLINE COMMENT COLON ANY ZONESTR
%token <str> STRING
%token VAR_SERVER VAR_VERBOSITY VAR_NUM_THREADS

%%
toplevelvars: /* empty */ | toplevelvars toplevelvar ;
toplevelvar: serverstart contents_server ;

/* server: declaration */
serverstart: VAR_SERVER
	{ OUTYY(("\nP(server:)\n")); 
		if(server_settings_seen) {
			yyerror("duplicate server: element.");
		}
		server_settings_seen = 1;
	}
	;
contents_server: contents_server content_server | ;
content_server: server_num_threads | server_verbosity;
server_num_threads: VAR_NUM_THREADS STRING 
	{ 
		OUTYY(("P(server_num_threads:%s)\n", $2)); 
		if(atoi($2) == 0 && strcmp($2, "0") != 0)
			yyerror("number expected");
		else cfg_parser->cfg->num_threads = atoi($2);
		free($2);
	}
	;
server_verbosity: VAR_VERBOSITY STRING 
	{ 
		OUTYY(("P(server_verbosity:%s)\n", $2)); 
		if(atoi($2) == 0 && strcmp($2, "0") != 0)
			yyerror("number expected");
		else cfg_parser->cfg->verbosity = atoi($2);
		free($2);
	}
	;

%%

/* parse helper routines could be here */