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/* Copyright (c) 2018, MariaDB
This program 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 of the License.
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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef SQL_TYPE_INT_INCLUDED
#define SQL_TYPE_INT_INCLUDED
class Null_flag
{
protected:
bool m_is_null;
public:
bool is_null() const { return m_is_null; }
Null_flag(bool is_null) :m_is_null(is_null) { }
};
class Longlong
{
protected:
longlong m_value;
public:
longlong value() const { return m_value; }
Longlong(longlong nr) :m_value(nr) { }
};
class Longlong_null: public Longlong, public Null_flag
{
public:
Longlong_null(longlong nr, bool is_null)
:Longlong(nr), Null_flag(is_null)
{ }
};
// A longlong/ulonglong hybrid. Good to store results of val_int().
class Longlong_hybrid: public Longlong
{
protected:
bool m_unsigned;
int cmp_signed(const Longlong_hybrid& other) const
{
return m_value < other.m_value ? -1 : m_value == other.m_value ? 0 : 1;
}
int cmp_unsigned(const Longlong_hybrid& other) const
{
return (ulonglong) m_value < (ulonglong) other.m_value ? -1 :
m_value == other.m_value ? 0 : 1;
}
public:
Longlong_hybrid(longlong nr, bool unsigned_flag)
:Longlong(nr), m_unsigned(unsigned_flag)
{ }
bool is_unsigned() const { return m_unsigned; }
bool is_unsigned_outside_of_signed_range() const
{
return m_unsigned && ((ulonglong) m_value) > (ulonglong) LONGLONG_MAX;
}
bool neg() const { return m_value < 0 && !m_unsigned; }
ulonglong abs() const
{
if (m_unsigned)
return (ulonglong) m_value;
if (m_value == LONGLONG_MIN) // avoid undefined behavior
return ((ulonglong) LONGLONG_MAX) + 1;
return m_value < 0 ? -m_value : m_value;
}
/*
Convert to an unsigned number:
- Negative numbers are converted to 0.
- Positive numbers bigger than upper_bound are converted to upper_bound.
- Other numbers are returned as is.
*/
ulonglong to_ulonglong(ulonglong upper_bound) const
{
return neg() ? 0 :
(ulonglong) m_value > upper_bound ? upper_bound :
(ulonglong) m_value;
}
uint to_uint(uint upper_bound) const
{
return (uint) to_ulonglong(upper_bound);
}
int cmp(const Longlong_hybrid& other) const
{
if (m_unsigned == other.m_unsigned)
return m_unsigned ? cmp_unsigned(other) : cmp_signed(other);
if (is_unsigned_outside_of_signed_range())
return 1;
if (other.is_unsigned_outside_of_signed_range())
return -1;
/*
The unsigned argument is in the range 0..LONGLONG_MAX.
The signed argument is in the range LONGLONG_MIN..LONGLONG_MAX.
Safe to compare as signed.
*/
return cmp_signed(other);
}
};
class Longlong_hybrid_null: public Longlong_hybrid,
public Null_flag
{
public:
Longlong_hybrid_null(const Longlong_null &nr, bool unsigned_flag)
:Longlong_hybrid(nr.value(), unsigned_flag),
Null_flag(nr.is_null())
{ }
};
#endif // SQL_TYPE_INT_INCLUDED
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