128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
/*
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* ZoneMinder regular expression class implementation, $Date$, $Revision$
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* Copyright (C) 2001-2008 Philip Coombes
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "zm_regexp.h"
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#include "zm_logger.h"
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#include <cstring>
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#if HAVE_LIBPCRE
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RegExpr::RegExpr( const char *pattern, int flags, int p_max_matches ) : max_matches( p_max_matches ), match_buffers( nullptr ), match_lengths( nullptr ), match_valid( nullptr )
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{
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const char *errstr;
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int erroffset = 0;
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if ( !(regex = pcre_compile( pattern, flags, &errstr, &erroffset, 0 )) )
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{
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Panic( "pcre_compile(%s): %s at %d", pattern, errstr, erroffset );
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}
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regextra = pcre_study( regex, 0, &errstr );
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if ( errstr )
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{
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Panic( "pcre_study(%s): %s", pattern, errstr );
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}
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if ( (ok = (bool)regex) )
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{
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match_vectors = new int[3*max_matches];
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memset( match_vectors, 0, sizeof(*match_vectors)*3*max_matches );
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match_buffers = new char *[max_matches];
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memset( match_buffers, 0, sizeof(*match_buffers)*max_matches );
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match_lengths = new int[max_matches];
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memset( match_lengths, 0, sizeof(*match_lengths)*max_matches );
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match_valid = new bool[max_matches];
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memset( match_valid, 0, sizeof(*match_valid)*max_matches );
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} else {
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match_vectors = nullptr;
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}
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match_string = "";
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n_matches = 0;
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}
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RegExpr::~RegExpr()
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{
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for ( int i = 0; i < max_matches; i++ )
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{
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if ( match_buffers[i] )
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{
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delete[] match_buffers[i];
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}
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}
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delete[] match_valid;
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delete[] match_lengths;
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delete[] match_buffers;
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delete[] match_vectors;
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}
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int RegExpr::Match( const char *subject_string, int subject_length, int flags )
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{
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match_string = subject_string;
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n_matches = pcre_exec( regex, regextra, subject_string, subject_length, 0, flags, match_vectors, 2*max_matches );
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if ( n_matches <= 0 )
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{
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if ( n_matches < PCRE_ERROR_NOMATCH )
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{
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Error( "Error %d executing regular expression", n_matches );
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}
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return( n_matches = 0 );
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}
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for( int i = 0; i < max_matches; i++ )
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{
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match_valid[i] = false;
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}
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return( n_matches );
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}
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const char *RegExpr::MatchString( int match_index ) const
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{
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if ( match_index > n_matches )
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{
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return( 0 );
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}
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if ( !match_valid[match_index] )
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{
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int match_len = match_vectors[(2*match_index)+1]-match_vectors[2*match_index];
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if ( match_lengths[match_index] < (match_len+1) )
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{
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delete[] match_buffers[match_index];
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match_buffers[match_index] = new char[match_len+1];
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match_lengths[match_index] = match_len+1;
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}
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memcpy( match_buffers[match_index], match_string+match_vectors[2*match_index], match_len );
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match_buffers[match_index][match_len] = '\0';
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match_valid[match_index] = true;
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}
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return( match_buffers[match_index] );
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}
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int RegExpr::MatchLength( int match_index ) const
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{
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if ( match_index > n_matches )
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{
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return( 0 );
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}
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return( match_vectors[(2*match_index)+1]-match_vectors[2*match_index] );
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}
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#endif // HAVE_LIBPCRE
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