1 /* doscan - Denial Of Service Capable Auditing of Networks -*- C++ -*-
2 * Copyright (C) 2003 Florian Weimer
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #include "config.h"
20 #include "rx.h"
21
22 #include <string>
23
24 // rx
25
rx(const char * pattern,int options)26 rx::rx(const char* pattern, int options) throw (error)
27 {
28 const char *err;
29 int offset;
30
31 regexp = pcre_compile(pattern, options, &err, &offset, 0);
32 if (regexp == 0) {
33 throw error(err, offset);
34 }
35
36 pcre_fullinfo(regexp, 0, PCRE_INFO_CAPTURECOUNT, &capture_count);
37 }
38
~rx()39 rx::~rx()
40 {
41 free(regexp);
42 }
43
44 bool
exec(const std::string & data,unsigned offset,int options) const45 rx::exec(const std::string& data, unsigned offset, int options) const
46 {
47 // pcre_exec() might need to store the matches for backreferences in
48 // the pattern, so we always pass the ovector array of the suitable
49 // length.
50
51 int ovecsize = (capture_count + 1) * 3;
52 int ovector[ovecsize];
53 int result = pcre_exec(regexp, 0, data.data(), data.size(), offset, options,
54 ovector, ovecsize);
55
56 if (result >= 0) {
57 return true;
58 } else if (result == PCRE_ERROR_NOMATCH) {
59 return false;
60 } else {
61 throw match_error(result);
62 }
63 }
64
65 bool
exec(const std::string & data,match & m,unsigned offset,int options) const66 rx::exec(const std::string& data, match& m, unsigned offset, int options) const
67 {
68 // pcre_exec() might need to store the matches for backreferences in
69 // the pattern, so we always pass the ovector array of the suitable
70 // length.
71
72 int ovecsize = (capture_count + 1) * 3;
73 int ovector[ovecsize];
74 int result = pcre_exec(regexp, 0, data.data(), data.size(), offset, options,
75 ovector, ovecsize);
76
77 if (result > 0) {
78 m.first = data.begin() + ovector[0];
79 m.last = data.begin() + ovector[1];
80 return true;
81 } else if (result == 0 || result == PCRE_ERROR_NOMATCH) {
82 m.first = m.last = data.begin();
83 return false;
84 } else {
85 throw match_error(result);
86 }
87 }
88
89 bool
exec(const std::string & data,matches & m,unsigned offset,int options) const90 rx::exec(const std::string& data, matches& m,
91 unsigned offset, int options) const
92 {
93 // pcre_exec() might need to store the matches for backreferences in
94 // the pattern, so we always pass the ovector array of the suitable
95 // length.
96
97 int ovecsize = (capture_count + 1) * 3;
98 int ovector[ovecsize];
99 int result = pcre_exec(regexp, 0, data.data(), data.size(), offset, options,
100 ovector, ovecsize);
101
102 if (result >= 0) {
103 m.set(data, ovector, ovecsize);
104 return true;
105 } else if (result == PCRE_ERROR_NOMATCH) {
106 m.clear();
107 return false;
108 } else {
109 throw match_error(result);
110 }
111 }
112
113 // matches
114
115 void
set(const std::string & data,int * ovector,int ovecsize)116 rx::matches::set(const std::string& data, int *ovector, int ovecsize)
117 {
118 unsigned count = ovecsize / 3;
119 const std::string::const_iterator begin = data.begin();
120
121 array.resize(count);
122
123 for (unsigned j = 0; j < count; j++) {
124 array[j].first = begin + ovector[2 * j];
125 array[j].last = begin + ovector[2 * j + 1];
126 }
127 }
128