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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// General string-splitting methods. These methods along with lexical analyzer
// classes (such as those defined in lex.hpp and OptionList::LexComment) can be
// used as a basis for parsers.
#ifndef OPENVPN_COMMON_SPLIT_H
#define OPENVPN_COMMON_SPLIT_H
#include <string>
#include <vector>
#include <utility>
#include <openvpn/common/size.hpp>
#include <openvpn/common/lex.hpp>
#include <openvpn/common/clamp_typerange.hpp>
using namespace openvpn::numeric_util;
namespace openvpn::Split {
enum
{
TRIM_LEADING_SPACES = (1 << 0),
TRIM_SPECIAL = (1 << 1), // trims quotes (but respects their content)
};
struct NullLimit
{
void add_term()
{
}
};
// Split a string using a character (such as ',') as a separator.
// Types:
// V : string vector of return data
// LEX : lexical analyzer class such as StandardLex
// LIM : limit class such as OptionList::Limits
// Args:
// ret : return data -- a list of strings
// input : input string to be split
// split_by : separator
// flags : TRIM_LEADING_SPACES, TRIM_SPECIAL
// max_terms : the size of the returned string list will be, at most, this value + 1. Pass
// ~0 to disable.
// lim : an optional limits object such as OptionList::Limits
template <typename V, typename LEX, typename LIM>
inline void by_char_void(V &ret, const std::string &input, const char split_by, const unsigned int flags = 0, const unsigned int max_terms = ~0, LIM *lim = nullptr)
{
LEX lex;
unsigned int nterms = 0;
std::string term;
for (std::string::const_iterator i = input.begin(); i != input.end(); ++i)
{
const char c = *i;
lex.put(c);
if (!lex.in_quote() && c == split_by && nterms < max_terms)
{
if (lim)
lim->add_term();
ret.push_back(std::move(term));
++nterms;
term = "";
}
else if ((!(flags & TRIM_SPECIAL) || lex.available())
&& (!(flags & TRIM_LEADING_SPACES) || !term.empty() || !SpaceMatch::is_space(c)))
term += c;
}
if (lim)
lim->add_term();
ret.push_back(std::move(term));
}
// convenience method that returns data rather than modifying an in-place argument
template <typename V, typename LEX, typename LIM>
inline V by_char(const std::string &input, const char split_by, const unsigned int flags = 0, const unsigned int max_terms = ~0, LIM *lim = nullptr)
{
V ret;
by_char_void<V, LEX, LIM>(ret, input, split_by, flags, max_terms, lim);
return ret;
}
// Split a string using spaces as a separator.
// Types:
// V : string vector of return data
// LEX : lexical analyzer class such as StandardLex
// SPACE : class that we use to differentiate between space and non-space chars
// LIM : limit class such as OptionList::Limits
// Args:
// ret : return data -- a list of strings
// input : input string to be split
// lim : an optional limits object such as OptionList::Limits
template <typename V, typename LEX, typename SPACE, typename LIM>
inline void by_space_void(V &ret, const std::string &input, LIM *lim = nullptr)
{
LEX lex;
std::string term;
bool defined = false;
for (std::string::const_iterator i = input.begin(); i != input.end(); ++i)
{
const char c = *i;
lex.put(c);
if (lex.in_quote())
defined = true;
if (lex.available())
{
const char tc = clamp_to_default<char>(lex.get(), '?');
if (!SPACE::is_space(tc) || lex.in_quote())
{
defined = true;
term += tc;
}
else if (defined)
{
if (lim)
lim->add_term();
ret.push_back(std::move(term));
term = "";
defined = false;
}
}
}
if (defined)
{
if (lim)
lim->add_term();
ret.push_back(std::move(term));
}
}
// convenience method that returns data rather than modifying an in-place argument
template <typename V, typename LEX, typename SPACE, typename LIM>
inline V by_space(const std::string &input, LIM *lim = nullptr)
{
V ret;
by_space_void<V, LEX, SPACE, LIM>(ret, input, lim);
return ret;
}
} // namespace openvpn::Split
#endif // OPENVPN_COMMON_SPLIT_H
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