/Python/structmember.c
http://unladen-swallow.googlecode.com/ · C · 348 lines · 326 code · 13 blank · 9 comment · 103 complexity · 251600bf811a4b1fc817bf7063bd7e9e MD5 · raw file
- /* 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, ©);
- }
- }
- 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, ©, 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;
- }