mirror of https://github.com/python/cpython
306 lines
9.1 KiB
C
306 lines
9.1 KiB
C
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/* Map C struct members to Python object attributes */
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#include "Python.h"
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#include "structmember.h" // PyMemberDef
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PyObject *
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PyMember_GetOne(const char *obj_addr, PyMemberDef *l)
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{
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PyObject *v;
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if (l->flags & Py_RELATIVE_OFFSET) {
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PyErr_SetString(
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PyExc_SystemError,
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"PyMember_GetOne used with Py_RELATIVE_OFFSET");
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return NULL;
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}
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const char* addr = obj_addr + l->offset;
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switch (l->type) {
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case T_BOOL:
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v = PyBool_FromLong(*(char*)addr);
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break;
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case T_BYTE:
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v = PyLong_FromLong(*(char*)addr);
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break;
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case T_UBYTE:
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v = PyLong_FromUnsignedLong(*(unsigned char*)addr);
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break;
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case T_SHORT:
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v = PyLong_FromLong(*(short*)addr);
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break;
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case T_USHORT:
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v = PyLong_FromUnsignedLong(*(unsigned short*)addr);
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break;
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case T_INT:
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v = PyLong_FromLong(*(int*)addr);
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break;
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case T_UINT:
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v = PyLong_FromUnsignedLong(*(unsigned int*)addr);
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break;
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case T_LONG:
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v = PyLong_FromLong(*(long*)addr);
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break;
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case T_ULONG:
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v = PyLong_FromUnsignedLong(*(unsigned long*)addr);
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break;
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case T_PYSSIZET:
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v = PyLong_FromSsize_t(*(Py_ssize_t*)addr);
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break;
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case T_FLOAT:
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v = PyFloat_FromDouble((double)*(float*)addr);
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break;
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case T_DOUBLE:
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v = PyFloat_FromDouble(*(double*)addr);
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break;
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case T_STRING:
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if (*(char**)addr == NULL) {
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v = Py_NewRef(Py_None);
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}
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else
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v = PyUnicode_FromString(*(char**)addr);
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break;
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case T_STRING_INPLACE:
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v = PyUnicode_FromString((char*)addr);
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break;
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case T_CHAR:
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v = PyUnicode_FromStringAndSize((char*)addr, 1);
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break;
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case T_OBJECT:
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v = *(PyObject **)addr;
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if (v == NULL)
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v = Py_None;
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Py_INCREF(v);
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break;
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case T_OBJECT_EX:
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v = *(PyObject **)addr;
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if (v == NULL) {
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PyObject *obj = (PyObject *)obj_addr;
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PyTypeObject *tp = Py_TYPE(obj);
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PyErr_Format(PyExc_AttributeError,
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"'%.200s' object has no attribute '%s'",
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tp->tp_name, l->name);
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}
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Py_XINCREF(v);
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break;
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case T_LONGLONG:
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v = PyLong_FromLongLong(*(long long *)addr);
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break;
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case T_ULONGLONG:
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v = PyLong_FromUnsignedLongLong(*(unsigned long long *)addr);
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break;
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case T_NONE:
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v = Py_NewRef(Py_None);
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break;
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default:
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PyErr_SetString(PyExc_SystemError, "bad memberdescr type");
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v = NULL;
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}
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return v;
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}
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#define WARN(msg) \
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do { \
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if (PyErr_WarnEx(PyExc_RuntimeWarning, msg, 1) < 0) \
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return -1; \
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} while (0)
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int
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PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
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{
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PyObject *oldv;
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if (l->flags & Py_RELATIVE_OFFSET) {
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PyErr_SetString(
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PyExc_SystemError,
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"PyMember_SetOne used with Py_RELATIVE_OFFSET");
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return -1;
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}
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addr += l->offset;
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if ((l->flags & READONLY))
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{
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PyErr_SetString(PyExc_AttributeError, "readonly attribute");
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return -1;
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}
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if (v == NULL) {
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if (l->type == T_OBJECT_EX) {
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/* Check if the attribute is set. */
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if (*(PyObject **)addr == NULL) {
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PyErr_SetString(PyExc_AttributeError, l->name);
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return -1;
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}
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}
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else if (l->type != T_OBJECT) {
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PyErr_SetString(PyExc_TypeError,
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"can't delete numeric/char attribute");
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return -1;
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}
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}
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switch (l->type) {
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case T_BOOL:{
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if (!PyBool_Check(v)) {
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PyErr_SetString(PyExc_TypeError,
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"attribute value type must be bool");
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return -1;
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}
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if (v == Py_True)
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*(char*)addr = (char) 1;
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else
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*(char*)addr = (char) 0;
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break;
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}
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case T_BYTE:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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*(char*)addr = (char)long_val;
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/* XXX: For compatibility, only warn about truncations
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for now. */
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if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))
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WARN("Truncation of value to char");
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break;
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}
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case T_UBYTE:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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*(unsigned char*)addr = (unsigned char)long_val;
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if ((long_val > UCHAR_MAX) || (long_val < 0))
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WARN("Truncation of value to unsigned char");
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break;
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}
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case T_SHORT:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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*(short*)addr = (short)long_val;
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if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))
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WARN("Truncation of value to short");
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break;
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}
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case T_USHORT:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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*(unsigned short*)addr = (unsigned short)long_val;
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if ((long_val > USHRT_MAX) || (long_val < 0))
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WARN("Truncation of value to unsigned short");
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break;
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}
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case T_INT:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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*(int *)addr = (int)long_val;
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if ((long_val > INT_MAX) || (long_val < INT_MIN))
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WARN("Truncation of value to int");
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break;
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}
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case T_UINT:{
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unsigned long ulong_val = PyLong_AsUnsignedLong(v);
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if ((ulong_val == (unsigned long)-1) && PyErr_Occurred()) {
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/* XXX: For compatibility, accept negative int values
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as well. */
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PyErr_Clear();
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ulong_val = PyLong_AsLong(v);
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if ((ulong_val == (unsigned long)-1) &&
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PyErr_Occurred())
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return -1;
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*(unsigned int *)addr = (unsigned int)ulong_val;
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WARN("Writing negative value into unsigned field");
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} else
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*(unsigned int *)addr = (unsigned int)ulong_val;
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if (ulong_val > UINT_MAX)
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WARN("Truncation of value to unsigned int");
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break;
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}
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case T_LONG:{
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*(long*)addr = PyLong_AsLong(v);
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if ((*(long*)addr == -1) && PyErr_Occurred())
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return -1;
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break;
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}
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case T_ULONG:{
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*(unsigned long*)addr = PyLong_AsUnsignedLong(v);
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if ((*(unsigned long*)addr == (unsigned long)-1)
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&& PyErr_Occurred()) {
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/* XXX: For compatibility, accept negative int values
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as well. */
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PyErr_Clear();
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*(unsigned long*)addr = PyLong_AsLong(v);
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if ((*(unsigned long*)addr == (unsigned long)-1)
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&& PyErr_Occurred())
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return -1;
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WARN("Writing negative value into unsigned field");
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}
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break;
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}
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case T_PYSSIZET:{
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*(Py_ssize_t*)addr = PyLong_AsSsize_t(v);
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if ((*(Py_ssize_t*)addr == (Py_ssize_t)-1)
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&& PyErr_Occurred())
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return -1;
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break;
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}
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case T_FLOAT:{
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double double_val = PyFloat_AsDouble(v);
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if ((double_val == -1) && PyErr_Occurred())
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return -1;
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*(float*)addr = (float)double_val;
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break;
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}
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case T_DOUBLE:
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*(double*)addr = PyFloat_AsDouble(v);
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if ((*(double*)addr == -1) && PyErr_Occurred())
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return -1;
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break;
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case T_OBJECT:
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case T_OBJECT_EX:
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oldv = *(PyObject **)addr;
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*(PyObject **)addr = Py_XNewRef(v);
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Py_XDECREF(oldv);
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break;
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case T_CHAR: {
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const char *string;
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Py_ssize_t len;
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string = PyUnicode_AsUTF8AndSize(v, &len);
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if (string == NULL || len != 1) {
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PyErr_BadArgument();
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return -1;
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}
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*(char*)addr = string[0];
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break;
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}
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case T_STRING:
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case T_STRING_INPLACE:
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PyErr_SetString(PyExc_TypeError, "readonly attribute");
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return -1;
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case T_LONGLONG:{
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long long value;
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*(long long*)addr = value = PyLong_AsLongLong(v);
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if ((value == -1) && PyErr_Occurred())
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return -1;
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break;
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}
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case T_ULONGLONG:{
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unsigned long long value;
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/* ??? PyLong_AsLongLong accepts an int, but PyLong_AsUnsignedLongLong
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doesn't ??? */
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if (PyLong_Check(v))
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*(unsigned long long*)addr = value = PyLong_AsUnsignedLongLong(v);
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else
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*(unsigned long long*)addr = value = PyLong_AsLong(v);
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if ((value == (unsigned long long)-1) && PyErr_Occurred())
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return -1;
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break;
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}
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default:
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PyErr_Format(PyExc_SystemError,
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"bad memberdescr type for %s", l->name);
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return -1;
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}
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return 0;
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}
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