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/*
* Ivy, C++ interface
*
* Copyright (C) 1997-2000
* Centre d'Études de la Navigation Aérienne
*
* Bind syntax for extracting message comtent
* using regexp or other
*
* Authors: François-Régis Colin <fcolin@cena.fr>
*
* $Id: ivybind.c,v 1.9.2.7 2006/06/01 12:07:17 bustico Exp $
*
* Please refer to file version.h for the
* copyright notice regarding this software
*/
/* Module de gestion de la syntaxe des messages Ivy */
#include "IvyStdAfx.h"
#include "IvyBinding.h"
static int err_offset;
#ifdef USE_PCRE
static const char *err_buf;
#else /* we don't USE_PCRE */
static char err_buf[4096];
#endif /* USE_PCRE */
/* classes de messages emis par l'application utilise pour le filtrage */
static int messages_classes_count = 0;
static const char **messages_classes = 0;
/* regexp d'extraction du mot clef des regexp client pour le filtrage des regexp , ca va c'est clair ??? */
static IvyBinding token_extract;
IvyBinding::IvyBinding()
{
#ifdef USE_PCRE
regexp = NULL;
inspect = NULL;
#else /* we don't USE_PCRE */
free( regexp );
#endif /* USE_PCRE */
nb_match = 0;
}
IvyBinding::~IvyBinding()
{
#ifdef USE_PCRE
if (inspect!=NULL)
pcre_free(inspect);
if (regexp!=NULL)
pcre_free(regexp);
#else /* we don't USE_PCRE */
free( regexp );
#endif /* USE_PCRE */
}
bool IvyBinding::Compile( const char * expression, int *erroffset, const char **errmessage )
{
bool compile = false;
#ifdef USE_PCRE
regexp = pcre_compile(expression, PCRE_CASELESS, &err_buf, &err_offset, NULL);
if ( regexp != NULL )
{
this->inspect = pcre_study(regexp,0,&err_buf);
if (err_buf!=NULL)
{
printf("Error studying %s, message: %s\n",expression,err_buf);
}
compile = true;
}
else
{
*erroffset = err_offset;
*errmessage = err_buf;
printf("Error compiling '%s', %s\n", expression, err_buf);
}
#else /* we don't USE_PCRE */
regex_t regexp;
int reg;
reg = regcomp(®exp, expression, REGCOMP_OPT|REG_EXTENDED);
if ( reg == 0 )
{
this->next = NULL;
}
else
{
regerror (reg, ®exp, err_buf, sizeof(err_buf) );
*erroffset = err_offset;
*errmessage = err_buf;
printf("Error compiling '%s', %s\n", expression, err_buf);
}
#endif /* USE_PCRE */
return compile;
}
int IvyBinding::Exec( const char * message )
{
#ifdef USE_PCRE
nb_match = pcre_exec(
regexp,
inspect,
message,
strlen(message),
0, /* debut */
0, /* no other regexp option */
ovector,
OVECSIZE);
if (nb_match<1) return 0; /* no match */
#else /* we don't USE_PCRE */
memset( match, -1, sizeof(match )); /* work around bug !!!*/
nb_match = regexec (®exp, message, MAX_MSG_FIELDS, match, 0)
if (nb_match == REG_NOMATCH)
return 0;
for ( index = 1; index < MAX_MSG_FIELDS; index++ )
{
if ( match[i].rm_so != -1 )
nb_match++;
}
#endif /* USE_PCRE */
return nb_match;
}
void IvyBinding::Match( const char *message, int argnum, int *arglen, const char **arg)
{
#ifdef USE_PCRE
*arglen = ovector[2*argnum+1]- ovector[2*argnum];
*arg = message + ovector[2*argnum];
#else /* we don't USE_PCRE */
regmatch_t* p;
p = &match[argnum+1];
if ( p->rm_so != -1 ) {
*arglen = p->rm_eo - p->rm_so;
*arg = message + p->rm_so;
} else { // ARG VIDE
*arglen = 0;
*arg = NULL;
}
#endif /* USE_PCRE */
}
//filter Expression Bind
void IvyBinding::SetFilter( int argc, const char **argv)
{
const char *errbuf;
int erroffset;
messages_classes_count = argc;
messages_classes = argv;
/* compile the token extraction regexp */
if ( !token_extract.Compile("^\\^([a-zA-Z_0-9-]+).*", & erroffset, & errbuf) )
{
printf("Error compiling Token Extract regexp: %s\n", errbuf);
}
}
int IvyBinding::Filter(const char *expression)
{
int i;
int err;
int regexp_ok = 1; /* accepte tout par default */
int tokenlen;
const char *token;
if ( *expression =='^' && messages_classes_count !=0 )
{
regexp_ok = 0;
/* extract token */
err = token_extract.Exec( expression );
if ( err < 1 ) return 1;
token_extract.Match( expression , 1, &tokenlen, &token );
for ( i = 0 ; i < messages_classes_count; i++ )
{
if (strncmp( messages_classes[i], token, tokenlen ) == 0) {
return 1; }
// else {
//printf ("DBG> %s eliminé [%s]\n", token, expression);
//}
}
}
return regexp_ok;
}
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