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|
%option noyywrap
%option nounput
%option prefix="Dtd_PreParse_"
%option never-interactive
%option caseless
%option outfile="dtd_preparse.c"
%{
/*
* dtd_preparser.l
*
* an XML dissector for wireshark
*
* DTD Preparser - import a dtd file into a GString
* including files, removing comments
* and resolving %entities;
*
* Copyright 2004, Luis E. Garcia Ontanon <luis.ontanon@gmail.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <glib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include "dtd.h"
#define ECHO g_string_append(current,yytext);
static GString* current;
static GString* output;
static GHashTable* entities;
static gchar* entity_name;
static GString* error;
static const gchar* dtd_dirname;
static const gchar* filename;
static guint linenum;
static GString* textstr;
static gchar* replace_entity(gchar* s);
static const gchar* location(void);
%}
xmlpi_start "<?"
xmlpi_stop "?>"
xmlpi_chars .
comment_start "<!--"
comment_stop "-->"
special_start "<!"
special_stop ">"
entity_start "<!"[[:blank:]\n]*entity[[:blank:]\n]*"%"
system SYSTEM
filename [^"]+
name [A-Za-z][-:A-Za-z0-9_\.]*
quote "\""
percent [%]
escaped_quote "\\\""
non_quote [^"%]+
avoid_editor_bug ["]
entity [%&][A-Za-z][-A-Za-z0-9_]*;
whitespace [[blank:]]+
newline \n
%START OUTSIDE IN_COMMENT IN_ENTITY NAMED_ENTITY IN_QUOTE ENTITY_DONE XMLPI
%%
{entity} if (current) g_string_sprintfa(current,"%s\n%s\n",replace_entity(yytext),location());
{whitespace} if (current) g_string_append(current," ");
<OUTSIDE>{xmlpi_start} { g_string_append(current,yytext); BEGIN XMLPI; }
<XMLPI>{xmlpi_chars} { g_string_append(current,yytext); }
<XMLPI>{newline} { g_string_append(current,yytext); }
<XMLPI>{xmlpi_stop} { g_string_append(current,yytext); BEGIN OUTSIDE; }
<OUTSIDE>{comment_start} { current = NULL; BEGIN IN_COMMENT; }
<IN_COMMENT>[^-]? |
<IN_COMMENT>[-] ;
<IN_COMMENT>{comment_stop} { current = output; BEGIN OUTSIDE; }
{newline} {
linenum++;
if (current) g_string_sprintfa(current,"%s\n",location());
}
<OUTSIDE>{entity_start} { BEGIN IN_ENTITY; }
<IN_ENTITY>{name} { entity_name = g_strdup_printf("%%%s;",yytext); BEGIN NAMED_ENTITY; }
<NAMED_ENTITY>{quote} { current = g_string_new(location()); BEGIN IN_QUOTE; }
<IN_QUOTE>{quote} { g_hash_table_insert(entities,entity_name,current); BEGIN ENTITY_DONE; }
<IN_QUOTE>{percent} |
<IN_QUOTE>{non_quote} |
<IN_QUOTE>{escaped_quote} g_string_append(current,yytext);
<NAMED_ENTITY>{system} {
g_string_sprintfa(error,"at %s:%u: file inclusion is not supported!", filename, linenum);
yyterminate();
}
<ENTITY_DONE>{special_stop} { current = output; g_string_append(current,"\n"); BEGIN OUTSIDE; }
%%
static gchar* replace_entity(gchar* entity) {
GString* replacement;
*entity = '%';
replacement = g_hash_table_lookup(entities,entity);
if (replacement) {
return replacement->str;
} else {
g_string_sprintfa(error,"dtd_preparse: in file '%s': entity %s does not exists\n", filename, entity);
return "";
}
}
static const gchar* location(void) {
static gchar* loc = NULL;
if (loc) g_free(loc);
loc = g_strdup_printf("<? wireshark:location %s:%u ?>", filename, linenum);
return loc;
}
static gboolean free_gstring_hash_items(gpointer k,gpointer v,gpointer p _U_) {
g_free(k);
g_string_free(v,TRUE);
return TRUE;
}
extern GString* dtd_preparse(const gchar* dname,const gchar* fname, GString* err) {
gchar* fullname = g_strdup_printf("%s%c%s",dname,G_DIR_SEPARATOR,fname);
dtd_dirname = dname;
filename = fname;
linenum = 1;
yyin = fopen(fullname,"r");
if (!yyin) {
if (err)
g_string_sprintfa(err, "Could not open file: '%s', error: %s",fullname,strerror(errno));
return NULL;
}
error = err;
entities = g_hash_table_new(g_str_hash,g_str_equal);
current = output = g_string_new(location());
BEGIN OUTSIDE;
yylex();
fclose(yyin);
yyrestart(NULL);
g_hash_table_foreach_remove(entities,free_gstring_hash_items,NULL);
g_hash_table_destroy(entities);
g_free(fullname);
return output;
}
|
