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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 purpose methods for dealing with numbers.
#ifndef OPENVPN_COMMON_NUMBER_H
#define OPENVPN_COMMON_NUMBER_H
#include <string>
#include <limits>
#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
namespace openvpn {
OPENVPN_EXCEPTION(number_parse_exception);
// Parse the number of type T in str, returning
// value in retval. Returns true on success.
// Note -- currently doesn't detect overflow.
// If nondigit_term is true, any non-digit char
// can terminate the numerical value. Otherwise,
// only '\0' can terminate the value.
template <typename T>
inline bool parse_number(const char *str,
T &retval,
const bool nondigit_term = false)
{
if (!str[0])
return false; // empty string
bool neg = false;
size_t i = 0;
if (std::numeric_limits<T>::min() < 0 && str[0] == '-')
{
neg = true;
i = 1;
}
T ret = T(0);
while (true)
{
const char c = str[i++];
if (c >= '0' && c <= '9')
{
ret *= T(10);
ret += T(c - '0');
}
else if (!c || nondigit_term)
{
retval = neg ? -ret : ret;
return true;
}
else
return false; // non-digit
}
}
// like parse_number above, but accepts std::string
template <typename T>
inline bool parse_number(const std::string &str, T &retval)
{
return parse_number<T>(str.c_str(), retval);
}
template <typename T>
inline T parse_number_throw(const std::string &str, const std::string &error)
{
T ret;
if (parse_number<T>(str.c_str(), ret))
return ret;
else
throw number_parse_exception(error);
}
template <typename T>
inline T parse_number_throw(const std::string &str, const char *error)
{
T ret;
if (parse_number<T>(str.c_str(), ret))
return ret;
else
throw number_parse_exception(std::string(error));
}
template <typename T>
inline T parse_number_throw(const char *str, const char *error)
{
T ret;
if (parse_number<T>(str, ret))
return ret;
else
throw number_parse_exception(std::string(error));
}
template <typename T>
inline bool parse_number_validate(const std::string &numstr,
const size_t max_len,
const T minimum,
const T maximum,
T *value_return = nullptr)
{
if (numstr.length() <= max_len)
{
T value;
if (parse_number<T>(numstr.c_str(), value))
{
if (value >= minimum && value <= maximum)
{
if (value_return)
*value_return = value;
return true;
}
}
}
return false;
}
inline bool is_number(const char *str)
{
char c;
bool found_digit = false;
while ((c = *str++))
{
if (c >= '0' && c <= '9')
found_digit = true;
else
return false;
}
return found_digit;
}
} // namespace openvpn
#endif // OPENVPN_COMMON_NUMBER_H
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