/* Map C struct members to Python object attributes */

#include "Python.h"

#include "structmember.h"

static PyObject *

listmembers(struct memberlist *mlist)

{

	int i, n;

	PyObject *v;

	for (n = 0; mlist[n].name != NULL; n++)

		;

	v = PyList_New(n);

	if (v != NULL) {

		for (i = 0; i < n; i++)

			PyList_SetItem(v, i,

				       PyString_FromString(mlist[i].name));

		if (PyErr_Occurred()) {

			Py_DECREF(v);

			v = NULL;

		}

		else {

			PyList_Sort(v);

		}

	}

	return v;

}

PyObject *

PyMember_Get(const char *addr, struct memberlist *mlist, const char *name)

{

	struct memberlist *l;

	if (strcmp(name, "__members__") == 0)

		return listmembers(mlist);

	for (l = mlist; l->name != NULL; l++) {

		if (strcmp(l->name, name) == 0) {

			PyMemberDef copy;

			copy.name = l->name;

			copy.type = l->type;

			copy.offset = l->offset;

			copy.flags = l->flags;

			copy.doc = NULL;

			return PyMember_GetOne(addr, &copy);

		}

	}

	PyErr_SetString(PyExc_AttributeError, name);

	return NULL;

}

PyObject *

PyMember_GetOne(const char *addr, PyMemberDef *l)

{

	PyObject *v;

	if ((l->flags & READ_RESTRICTED) &&

	    PyEval_GetRestricted()) {

		PyErr_SetString(PyExc_RuntimeError, "restricted attribute");

		return NULL;

	}

	addr += l->offset;

	switch (l->type) {

	case T_BOOL:

		v = PyBool_FromLong(*(char*)addr);

		break;

	case T_BYTE:

		v = PyInt_FromLong(*(char*)addr);

		break;

	case T_UBYTE:

		v = PyLong_FromUnsignedLong(*(unsigned char*)addr);

		break;

	case T_SHORT:

		v = PyInt_FromLong(*(short*)addr);

		break;

	case T_USHORT:

		v = PyLong_FromUnsignedLong(*(unsigned short*)addr);

		break;

	case T_INT:

		v = PyInt_FromLong(*(int*)addr);

		break;

	case T_UINT:

		v = PyLong_FromUnsignedLong(*(unsigned int*)addr);

		break;

	case T_LONG:

		v = PyInt_FromLong(*(long*)addr);

		break;

	case T_ULONG:

		v = PyLong_FromUnsignedLong(*(unsigned long*)addr);

		break;

	case T_PYSSIZET:

		v = PyInt_FromSsize_t(*(Py_ssize_t*)addr);

		break;

	case T_FLOAT:

		v = PyFloat_FromDouble((double)*(float*)addr);

		break;

	case T_DOUBLE:

		v = PyFloat_FromDouble(*(double*)addr);

		break;

	case T_STRING:

		if (*(char**)addr == NULL) {

			Py_INCREF(Py_None);

			v = Py_None;

		}

		else

			v = PyString_FromString(*(char**)addr);

		break;

	case T_STRING_INPLACE:

		v = PyString_FromString((char*)addr);

		break;

	case T_CHAR:

		v = PyString_FromStringAndSize((char*)addr, 1);

		break;

	case T_OBJECT:

		v = *(PyObject **)addr;

		if (v == NULL)

			v = Py_None;

		Py_INCREF(v);

		break;

	case T_OBJECT_EX:

		v = *(PyObject **)addr;

		if (v == NULL)

			PyErr_SetString(PyExc_AttributeError, l->name);

		Py_XINCREF(v);

		break;

#ifdef HAVE_LONG_LONG

	case T_LONGLONG:

		v = PyLong_FromLongLong(*(PY_LONG_LONG *)addr);

		break;

	case T_ULONGLONG:

		v = PyLong_FromUnsignedLongLong(*(unsigned PY_LONG_LONG *)addr);

		break;

#endif /* HAVE_LONG_LONG */

	default:

		PyErr_SetString(PyExc_SystemError, "bad memberdescr type");

		v = NULL;

	}

	return v;

}

int

PyMember_Set(char *addr, struct memberlist *mlist, const char *name, PyObject *v)

{

	struct memberlist *l;

	for (l = mlist; l->name != NULL; l++) {

		if (strcmp(l->name, name) == 0) {

			PyMemberDef copy;

			copy.name = l->name;

			copy.type = l->type;

			copy.offset = l->offset;

			copy.flags = l->flags;

			copy.doc = NULL;

			return PyMember_SetOne(addr, &copy, v);

		}

	}

	PyErr_SetString(PyExc_AttributeError, name);

	return -1;

}

#define WARN(msg)					\

    do {						\

	if (PyErr_Warn(PyExc_RuntimeWarning, msg) < 0)	\

		return -1;				\

    } while (0)

int

PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)

{

	PyObject *oldv;

	if ((l->flags & READONLY) || l->type == T_STRING)

	{

		PyErr_SetString(PyExc_TypeError, "readonly attribute");

		return -1;

	}

	if ((l->flags & PY_WRITE_RESTRICTED) && PyEval_GetRestricted()) {

		PyErr_SetString(PyExc_RuntimeError, "restricted attribute");

		return -1;

	}

	if (v == NULL && l->type != T_OBJECT_EX && l->type != T_OBJECT) {

		PyErr_SetString(PyExc_TypeError,

				"can't delete numeric/char attribute");

		return -1;

	}

	addr += l->offset;

	switch (l->type) {

	case T_BOOL:{

		if (!PyBool_Check(v)) {

			PyErr_SetString(PyExc_TypeError,

					"attribute value type must be bool");

			return -1;

		}

		if (v == Py_True)

			*(char*)addr = (char) 1;

		else

			*(char*)addr = (char) 0;

		break;

		}

	case T_BYTE:{

		long long_val = PyInt_AsLong(v);

		if ((long_val == -1) && PyErr_Occurred())

			return -1;

		*(char*)addr = (char)long_val;

		/* XXX: For compatibility, only warn about truncations

		   for now. */

		if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))

			WARN("Truncation of value to char");

		break;

		}

	case T_UBYTE:{

		long long_val = PyInt_AsLong(v);

		if ((long_val == -1) && PyErr_Occurred())

			return -1;

		*(unsigned char*)addr = (unsigned char)long_val;

		if ((long_val > UCHAR_MAX) || (long_val < 0))

			WARN("Truncation of value to unsigned char");

		break;

		}

	case T_SHORT:{

		long long_val = PyInt_AsLong(v);

		if ((long_val == -1) && PyErr_Occurred())

			return -1;

		*(short*)addr = (short)long_val;

		if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))

			WARN("Truncation of value to short");

		break;

		}

	case T_USHORT:{

		long long_val = PyInt_AsLong(v);

		if ((long_val == -1) && PyErr_Occurred())

			return -1;

		*(unsigned short*)addr = (unsigned short)long_val;

		if ((long_val > USHRT_MAX) || (long_val < 0))

			WARN("Truncation of value to unsigned short");

		break;

		}

  	case T_INT:{

		long long_val = PyInt_AsLong(v);

		if ((long_val == -1) && PyErr_Occurred())

			return -1;

		*(int *)addr = (int)long_val;

		if ((long_val > INT_MAX) || (long_val < INT_MIN))

			WARN("Truncation of value to int");

		break;

		}

	case T_UINT:{

		unsigned long ulong_val = PyLong_AsUnsignedLong(v);

		if ((ulong_val == (unsigned int)-1) && PyErr_Occurred()) {

			/* XXX: For compatibility, accept negative int values

			   as well. */

			PyErr_Clear();

			ulong_val = PyLong_AsLong(v);

			if ((ulong_val == (unsigned int)-1) && PyErr_Occurred())

				return -1;

			*(unsigned int *)addr = (unsigned int)ulong_val;

			WARN("Writing negative value into unsigned field");

		} else

			*(unsigned int *)addr = (unsigned int)ulong_val;

		if (ulong_val > UINT_MAX)

			WARN("Truncation of value to unsigned int");

		break;

		}

	case T_LONG:{

		*(long*)addr = PyLong_AsLong(v);

		if ((*(long*)addr == -1) && PyErr_Occurred())

			return -1;

		break;

		}

	case T_ULONG:{

		*(unsigned long*)addr = PyLong_AsUnsignedLong(v);

		if ((*(unsigned long*)addr == (unsigned long)-1)

		    && PyErr_Occurred()) {

			/* XXX: For compatibility, accept negative int values

			   as well. */

			PyErr_Clear();

			*(unsigned long*)addr = PyLong_AsLong(v);

			if ((*(unsigned long*)addr == (unsigned int)-1)

			    && PyErr_Occurred())

				return -1;

			WARN("Writing negative value into unsigned field");

		}

		break;

		}

	case T_PYSSIZET:{

		*(Py_ssize_t*)addr = PyInt_AsSsize_t(v);

		if ((*(Py_ssize_t*)addr == (Py_ssize_t)-1)

		    && PyErr_Occurred())

				return -1;

		break;

		}

	case T_FLOAT:{

		double double_val = PyFloat_AsDouble(v);

		if ((double_val == -1) && PyErr_Occurred())

			return -1;

		*(float*)addr = (float)double_val;

		break;

		}

	case T_DOUBLE:

		*(double*)addr = PyFloat_AsDouble(v);

		if ((*(double*)addr == -1) && PyErr_Occurred())

			return -1;

		break;

	case T_OBJECT:

	case T_OBJECT_EX:

		Py_XINCREF(v);

		oldv = *(PyObject **)addr;

		*(PyObject **)addr = v;

		Py_XDECREF(oldv);

		break;

	case T_CHAR:

		if (PyString_Check(v) && PyString_Size(v) == 1) {

			*(char*)addr = PyString_AsString(v)[0];

		}

		else {

			PyErr_BadArgument();

			return -1;

		}

		break;

#ifdef HAVE_LONG_LONG

	case T_LONGLONG:{

		PY_LONG_LONG value;

		*(PY_LONG_LONG*)addr = value = PyLong_AsLongLong(v);

		if ((value == -1) && PyErr_Occurred())

			return -1;

		break;

		}

	case T_ULONGLONG:{

		unsigned PY_LONG_LONG value;

		/* ??? PyLong_AsLongLong accepts an int, but PyLong_AsUnsignedLongLong

			doesn't ??? */

		if (PyLong_Check(v))

			*(unsigned PY_LONG_LONG*)addr = value = PyLong_AsUnsignedLongLong(v);

		else

			*(unsigned PY_LONG_LONG*)addr = value = PyInt_AsLong(v);

		if ((value == (unsigned PY_LONG_LONG)-1) && PyErr_Occurred())

			return -1;

		break;

		}

#endif /* HAVE_LONG_LONG */

	default:

		PyErr_Format(PyExc_SystemError,

			     "bad memberdescr type for %s", l->name);

		return -1;

	}

	return 0;

}