site: Prepare for adding more MSG3 variants

[secnet] / conffile.fl

/*
 * This file is part of secnet.
 * See README for full list of copyright holders.
 *
 * secnet is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * secnet is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * version 3 along with secnet; if not, see
 * https://www.gnu.org/licenses/gpl.html.
 */
/* the "incl" state is used for picking up the name of an include file */
%x incl

%option nounput
%option noinput
%option never-interactive
%option noyywrap

%{
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "conffile_internal.h"
#include "conffile.tab.h"
#include "util.h"

#define YY_NO_UNPUT

#define YY_INPUT(buf,result,max_size)					\
do{									\
	(result)= fread((buf),1,(max_size),yyin);			\
	if (ferror(yyin))						\
		fatal_perror("Error reading configuration file (%s)",	\
			     config_file);				\
}while(0)

#define MAX_INCLUDE_DEPTH 10
struct include_stack_item {
	YY_BUFFER_STATE bst;
	int lineno;
	cstring_t file;
};
struct include_stack_item include_stack[MAX_INCLUDE_DEPTH];
int include_stack_ptr=0;

int config_lineno=0;
cstring_t config_file="xxx";

static struct p_node *leafnode(uint32_t type)
{
	struct p_node *r;

	NEW(r);
	r->type=type;
	r->loc.file=config_file;
	r->loc.line=config_lineno;
	r->l=NULL; r->r=NULL;
	return r;
}

static struct p_node *keynode(atom_t key)
{
	struct p_node *r;
	r=leafnode(T_KEY);
	r->data.key=intern(key);
	return r;
}

static struct p_node *stringnode(string_t string)
{
	struct p_node *r;
	r=leafnode(T_STRING);
	string++;
	string[strlen(string)-1]=0;
	r->data.string=safe_strdup(string,"stringnode");
	return r;
}

static struct p_node *numnode(string_t number)
{
	struct p_node *r;
	unsigned long n;
	r=leafnode(T_NUMBER);
	errno = 0;
	n = strtoul(number, NULL, 10);
	/* The caller is expected to only give us [0-9]+,
	 * so we skip some of the usual syntax checking. */
	r->data.number=n;
	/* Give a consistent error message for any kind of
	 * out-of-range condition */
	if(errno == ERANGE || n != r->data.number) {
	    Message(M_FATAL,"config file %s line %d: '%s' is too big\n",
		    config_file, config_lineno, number);
	    exit(1);
	}
	if(errno) {
	    Message(M_FATAL,"config file %s line %d: '%s': %s\n",
		    config_file, config_lineno, number, strerror(errno));
	    exit(1);
	}
	return r;
}

%}

%%
include			BEGIN(incl);
<incl>[ \t]*		/* eat the whitespace */
<incl>[^ \t\n]+		{ /* got the include filename */
	if (include_stack_ptr >= MAX_INCLUDE_DEPTH) {
		fatal("Configuration file includes nested too deeply");
	}
	include_stack[include_stack_ptr].bst=YY_CURRENT_BUFFER;
	include_stack[include_stack_ptr].lineno=config_lineno;
	include_stack[include_stack_ptr].file=config_file;
	include_stack_ptr++;
	yyin=fopen(yytext,"r");
	if (!yyin) {
		fatal("Can't open included file %s",yytext);
	}
	config_lineno=1;
	config_file=safe_strdup(yytext,"conffile.fl/include");
	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
	BEGIN(INITIAL);
	}
<incl>\n		{ /* include with no filename */
	Message(M_FATAL,"config file %s line %d: %s\n",config_file,
		config_lineno,"``include'' requires a filename");
	BEGIN(INITIAL);
	assert(config_lineno < INT_MAX);
	++config_lineno;
	++yynerrs;
}

<<EOF>>		{
	if (--include_stack_ptr < 0) {
		yyterminate();
		}
	else {
		fclose(yyin);
		yy_delete_buffer(YY_CURRENT_BUFFER);
		yy_switch_to_buffer(include_stack[include_stack_ptr].bst);
		config_lineno=include_stack[include_stack_ptr].lineno;
		config_file=include_stack[include_stack_ptr].file;
	}
	}
\"[^\"]*\"		yylval=stringnode(yytext); return TOK_STRING;

[[:alpha:]_][[:alnum:]\-_]*	yylval=keynode(yytext); return TOK_KEY;

[[:digit:]]+		yylval=numnode(yytext); return TOK_NUMBER;

	/* Eat comments */
\#.*\n			config_lineno++;
	/* Count lines */
\n			config_lineno++;
	/* Eat whitespace */
[[:blank:]\j]

	/* Return all unclaimed single characters to the parser */
.			return *yytext;