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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2020-2023 Sadie Powell <sadie@witchery.services>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "modules/regex.h"
#ifdef _WIN32
# include "pcre2posix.h"
# pragma comment(lib, "pcre2-posix.lib")
#else
# include <regex.h>
# include <sys/types.h>
#endif
class POSIXPattern final
: public Regex::Pattern
{
private:
regex_t regex;
public:
POSIXPattern(const Module* mod, const std::string& pattern, uint8_t options)
: Regex::Pattern(pattern, options)
{
int flags = REG_EXTENDED;
if (options & Regex::OPT_CASE_INSENSITIVE)
flags |= REG_ICASE;
int error = regcomp(®ex, pattern.c_str(), flags);
if (!error)
return;
// Retrieve the size of the error message and allocate a buffer.
size_t errorsize = regerror(error, ®ex, nullptr, 0);
std::vector<char> errormsg(errorsize);
// Retrieve the error message and free the buffer.
regerror(error, ®ex, errormsg.data(), errormsg.size());
regfree(®ex);
throw Regex::Exception(mod, pattern, std::string(errormsg.data(), errormsg.size() - 1));
}
~POSIXPattern() override
{
regfree(®ex);
}
bool IsMatch(const std::string& text) override
{
return !regexec(®ex, text.c_str(), 0, nullptr, 0);
}
std::optional<Regex::MatchCollection> Matches(const std::string& text) override
{
std::vector<regmatch_t> matches(32);
int result = regexec(®ex, text.c_str(), matches.size(), matches.data(), 0);
if (result)
return std::nullopt;
Regex::Captures captures;
for (const auto& match : matches)
{
if (match.rm_so == -1 || match.rm_eo == -1)
break;
captures.emplace_back(text.c_str() + match.rm_so, match.rm_eo - match.rm_so);
}
captures.shrink_to_fit();
// The posix engine does not support named captures.
static const Regex::NamedCaptures unusednc;
return Regex::MatchCollection(captures, unusednc);
}
};
class ModuleRegexPOSIX final
: public Module
{
private:
Regex::SimpleEngine<POSIXPattern> regex;
public:
ModuleRegexPOSIX()
: Module(VF_VENDOR, "Provides the posix regular expression engine which uses the POSIX.2 regular expression matching system.")
, regex(this, "posix")
{
}
};
MODULE_INIT(ModuleRegexPOSIX)
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