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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* The implementation of the Python object to C/C++ integer convertors.
*
* Copyright (c) 2025 Phil Thompson <phil@riverbankcomputing.com>
*/
/* Remove when Python v3.12 is no longer supported. */
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <limits.h>
#include "sip_core.h"
static long long long_as_long_long(PyObject *o, long long min, long long max);
static unsigned long long_as_unsigned_long(PyObject *o, unsigned long max);
static void raise_signed_overflow(long long min, long long max);
static void raise_unsigned_overflow(unsigned long long max);
/*
* Convert a Python object to a C++ bool (returned as an int).
*/
int sip_api_convert_to_bool(PyObject *o)
{
int v;
/* Convert the object to an int while checking for overflow. */
v = sip_api_long_as_int(o);
if (PyErr_Occurred())
{
if (PyErr_ExceptionMatches(PyExc_OverflowError))
{
PyErr_Clear();
/* The value must have been non-zero. */
v = 1;
}
else
{
PyErr_Format(PyExc_TypeError, "a 'bool' is expected not '%s'",
Py_TYPE(o)->tp_name);
v = -1;
}
}
else if (v != 0)
{
v = 1;
}
return v;
}
/*
* Convert a Python object to a C char.
*/
char sip_api_long_as_char(PyObject *o)
{
return (char)long_as_long_long(o, CHAR_MIN, CHAR_MAX);
}
/*
* Convert a Python object to a C signed char.
*/
signed char sip_api_long_as_signed_char(PyObject *o)
{
return (signed char)long_as_long_long(o, SCHAR_MIN, SCHAR_MAX);
}
/*
* Convert a Python object to a C unsigned char.
*/
unsigned char sip_api_long_as_unsigned_char(PyObject *o)
{
return (unsigned char)long_as_unsigned_long(o, UCHAR_MAX);
}
/*
* Convert a Python object to a C short.
*/
short sip_api_long_as_short(PyObject *o)
{
return (short)long_as_long_long(o, SHRT_MIN, SHRT_MAX);
}
/*
* Convert a Python object to a C unsigned short.
*/
unsigned short sip_api_long_as_unsigned_short(PyObject *o)
{
return (unsigned short)long_as_unsigned_long(o, USHRT_MAX);
}
/*
* Convert a Python object to a C int.
*/
int sip_api_long_as_int(PyObject *o)
{
return (int)long_as_long_long(o, INT_MIN, INT_MAX);
}
/*
* Convert a Python object to a C unsigned int.
*/
unsigned sip_api_long_as_unsigned_int(PyObject *o)
{
return (unsigned)long_as_unsigned_long(o, UINT_MAX);
}
/*
* Convert a Python object to a C size_t.
*/
size_t sip_api_long_as_size_t(PyObject *o)
{
return (size_t)long_as_unsigned_long(o, SIZE_MAX);
}
/*
* Convert a Python object to a C long.
*/
long sip_api_long_as_long(PyObject *o)
{
return (long)long_as_long_long(o, LONG_MIN, LONG_MAX);
}
/*
* Convert a Python object to a C unsigned long.
*/
unsigned long sip_api_long_as_unsigned_long(PyObject *o)
{
return long_as_unsigned_long(o, ULONG_MAX);
}
/*
* Convert a Python object to a C long long.
*/
long long sip_api_long_as_long_long(PyObject *o)
{
return long_as_long_long(o, LLONG_MIN, LLONG_MAX);
}
/*
* Convert a Python object to a C unsigned long long.
*/
unsigned long long sip_api_long_as_unsigned_long_long(PyObject *o)
{
unsigned long long value;
PyErr_Clear();
value = PyLong_AsUnsignedLongLong(o);
if (PyErr_Occurred())
{
/* Provide a better exception message. */
if (PyErr_ExceptionMatches(PyExc_OverflowError))
raise_unsigned_overflow(ULLONG_MAX);
}
return value;
}
/*
* Convert a Python object to a long long checking that the value is within a
* range if overflow checking is enabled.
*/
static long long long_as_long_long(PyObject *o, long long min, long long max)
{
long long value;
PyErr_Clear();
value = PyLong_AsLongLong(o);
if (PyErr_Occurred())
{
/* Provide a better exception message. */
if (PyErr_ExceptionMatches(PyExc_OverflowError))
raise_signed_overflow(min, max);
}
else if (value < min || value > max)
{
raise_signed_overflow(min, max);
}
return value;
}
/*
* Convert a Python object to an unsigned long checking that the value is
* within a range if overflow checking is enabled.
*/
static unsigned long long_as_unsigned_long(PyObject *o, unsigned long max)
{
unsigned long value;
PyErr_Clear();
value = PyLong_AsUnsignedLong(o);
if (PyErr_Occurred())
{
/* Provide a better exception message. */
if (PyErr_ExceptionMatches(PyExc_OverflowError))
raise_unsigned_overflow(max);
}
else if (value > max)
{
raise_unsigned_overflow(max);
}
return value;
}
/*
* Raise an overflow exception if a signed value is out of range.
*/
static void raise_signed_overflow(long long min, long long max)
{
PyErr_Format(PyExc_OverflowError,
"value must be in the range %lld to %lld", min, max);
}
/*
* Raise an overflow exception if an unsigned value is out of range.
*/
static void raise_unsigned_overflow(unsigned long long max)
{
PyErr_Format(PyExc_OverflowError, "value must be in the range 0 to %llu",
max);
}
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