view Python/structmember.c @ 35298:b2fe5f8fcfdd legacy-trunk

PEP 342 implementation. Per Guido's comments, the generator throw() method still needs to support string exceptions, and allow None for the third argument. Documentation updates are needed, too.
author Phillip J. Eby <pje@telecommunity.com>
date Tue, 02 Aug 2005 00:46:46 +0000
parents e9ffad6d8822
children e9a10f74cf88
line wrap: on
line source


/* 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(char *addr, struct memberlist *mlist, 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(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_BYTE:
		v = PyInt_FromLong(
			(long) (((*(char*)addr & 0xff) ^ 0x80) - 0x80));
		break;
	case T_UBYTE:
		v = PyInt_FromLong((long) *(char*)addr & 0xff);
		break;
	case T_SHORT:
		v = PyInt_FromLong((long) *(short*)addr);
		break;
	case T_USHORT:
		v = PyInt_FromLong((long) *(unsigned short*)addr);
		break;
	case T_INT:
		v = PyInt_FromLong((long) *(int*)addr);
		break;
	case T_UINT:
		v = PyInt_FromLong((long) *(unsigned int*)addr);
		break;
	case T_LONG:
		v = PyInt_FromLong(*(long*)addr);
		break;
	case T_ULONG:
		v = PyLong_FromDouble((double) *(unsigned long*)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, 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;
}

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 & 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_BYTE:
	case T_UBYTE:
		if (!PyInt_Check(v)) {
			PyErr_BadArgument();
			return -1;
		}
		*(char*)addr = (char) PyInt_AsLong(v);
		break;
	case T_SHORT:
	case T_USHORT:
		if (!PyInt_Check(v)) {
			PyErr_BadArgument();
			return -1;
		}
		*(short*)addr = (short) PyInt_AsLong(v);
		break;
	case T_UINT:
	case T_INT:
		if (!PyInt_Check(v)) {
			PyErr_BadArgument();
			return -1;
		}
		*(int*)addr = (int) PyInt_AsLong(v);
		break;
	case T_LONG:
		if (!PyInt_Check(v)) {
			PyErr_BadArgument();
			return -1;
		}
		*(long*)addr = PyInt_AsLong(v);
		break;
	case T_ULONG:
		if (PyInt_Check(v))
			*(long*)addr = PyInt_AsLong(v);
		else if (PyLong_Check(v))
			*(long*)addr = PyLong_AsLong(v);
		else {
			PyErr_BadArgument();
			return -1;
		}
		break;
	case T_FLOAT:
		if (PyInt_Check(v))
			*(float*)addr =
				(float) PyInt_AsLong(v);
		else if (PyFloat_Check(v))
			*(float*)addr =
				(float) PyFloat_AsDouble(v);
		else {
			PyErr_BadArgument();
			return -1;
		}
		break;
	case T_DOUBLE:
		if (PyInt_Check(v))
			*(double*)addr = (double) PyInt_AsLong(v);
		else if (PyFloat_Check(v))
			*(double*)addr = PyFloat_AsDouble(v);
		else {
			PyErr_BadArgument();
			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:
		if (!PyLong_Check(v)) {
			PyErr_BadArgument();
			return -1;
		} else {
                        *(PY_LONG_LONG*)addr = PyLong_AsLongLong(v);
                        if ((*addr == -1) && PyErr_Occurred()) {
                                return -1;
                        }
                }
                break;
	case T_ULONGLONG:
                if (!PyLong_Check(v)) {
                        PyErr_BadArgument();
                        return -1;
                } else {
                        *(unsigned PY_LONG_LONG*)addr = PyLong_AsUnsignedLongLong(v);
                        if ((*addr == -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;
}