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adf0e437cb
old value in a temporary and XDECREF it only after then new value has been set. This prevents the (unlikely) case where the destructor of the member uses the containing object -- it would find it in an undefined state.
283 lines
6.5 KiB
C
283 lines
6.5 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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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"
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static PyObject *
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listmembers(mlist)
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struct memberlist *mlist;
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{
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int i, n;
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PyObject *v;
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for (n = 0; mlist[n].name != NULL; n++)
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;
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v = PyList_New(n);
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if (v != NULL) {
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for (i = 0; i < n; i++)
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PyList_SetItem(v, i,
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PyString_FromString(mlist[i].name));
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if (PyErr_Occurred()) {
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Py_DECREF(v);
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v = NULL;
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}
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else {
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PyList_Sort(v);
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}
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}
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return v;
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}
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PyObject *
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PyMember_Get(addr, mlist, name)
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char *addr;
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struct memberlist *mlist;
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char *name;
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{
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struct memberlist *l;
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if (strcmp(name, "__members__") == 0)
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return listmembers(mlist);
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for (l = mlist; l->name != NULL; l++) {
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if (strcmp(l->name, name) == 0) {
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PyObject *v;
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addr += l->offset;
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switch (l->type) {
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case T_BYTE:
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v = PyInt_FromLong((long)
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(((*(char*)addr & 0xff)
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^ 0x80) - 0x80));
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break;
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case T_UBYTE:
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v = PyInt_FromLong((long) *(char*)addr & 0xff);
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break;
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case T_SHORT:
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v = PyInt_FromLong((long) *(short*)addr);
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break;
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case T_USHORT:
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v = PyInt_FromLong((long)
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*(unsigned short*)addr);
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break;
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case T_INT:
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v = PyInt_FromLong((long) *(int*)addr);
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break;
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case T_UINT:
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v = PyInt_FromLong((long)
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*(unsigned int*)addr);
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break;
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case T_LONG:
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v = PyInt_FromLong(*(long*)addr);
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break;
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case T_ULONG:
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v = PyLong_FromDouble((double)
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*(unsigned long*)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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Py_INCREF(Py_None);
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v = Py_None;
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}
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else
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v = PyString_FromString(*(char**)addr);
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break;
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case T_STRING_INPLACE:
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v = PyString_FromString((char*)addr);
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break;
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#ifdef macintosh
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case T_PSTRING:
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if (*(char**)addr == NULL) {
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Py_INCREF(Py_None);
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v = Py_None;
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}
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else
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v = PyString_FromStringAndSize(
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(*(char**)addr)+1,
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**(unsigned char**)addr);
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break;
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case T_PSTRING_INPLACE:
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v = PyString_FromStringAndSize(
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((char*)addr)+1,
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*(unsigned char*)addr);
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break;
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#endif /* macintosh */
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case T_CHAR:
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v = PyString_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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default:
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PyErr_SetString(PyExc_SystemError,
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"bad memberlist 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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}
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PyErr_SetString(PyExc_AttributeError, name);
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return NULL;
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}
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int
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PyMember_Set(addr, mlist, name, v)
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char *addr;
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struct memberlist *mlist;
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char *name;
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PyObject *v;
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{
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struct memberlist *l;
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PyObject *oldv;
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for (l = mlist; l->name != NULL; l++) {
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if (strcmp(l->name, name) == 0) {
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#ifdef macintosh
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if (l->readonly || l->type == T_STRING ||
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l->type == T_PSTRING)
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{
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#else
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if (l->readonly || l->type == T_STRING ) {
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#endif /* macintosh */
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PyErr_SetString(PyExc_TypeError,
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"readonly attribute");
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return -1;
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}
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if (v == NULL && 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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addr += l->offset;
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switch (l->type) {
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case T_BYTE:
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case T_UBYTE:
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if (!PyInt_Check(v)) {
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PyErr_BadArgument();
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return -1;
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}
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*(char*)addr = (char) PyInt_AsLong(v);
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break;
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case T_SHORT:
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case T_USHORT:
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if (!PyInt_Check(v)) {
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PyErr_BadArgument();
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return -1;
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}
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*(short*)addr = (short) PyInt_AsLong(v);
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break;
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case T_UINT:
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case T_INT:
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if (!PyInt_Check(v)) {
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PyErr_BadArgument();
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return -1;
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}
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*(int*)addr = (int) PyInt_AsLong(v);
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break;
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case T_LONG:
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if (!PyInt_Check(v)) {
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PyErr_BadArgument();
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return -1;
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}
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*(long*)addr = PyInt_AsLong(v);
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break;
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case T_ULONG:
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if (PyInt_Check(v))
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*(long*)addr = PyInt_AsLong(v);
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else if (PyLong_Check(v))
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*(long*)addr = PyLong_AsLong(v);
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else {
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PyErr_BadArgument();
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return -1;
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}
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break;
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case T_FLOAT:
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if (PyInt_Check(v))
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*(float*)addr =
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(float) PyInt_AsLong(v);
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else if (PyFloat_Check(v))
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*(float*)addr =
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(float) PyFloat_AsDouble(v);
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else {
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PyErr_BadArgument();
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return -1;
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}
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break;
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case T_DOUBLE:
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if (PyInt_Check(v))
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*(double*)addr =
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(double) PyInt_AsLong(v);
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else if (PyFloat_Check(v))
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*(double*)addr = PyFloat_AsDouble(v);
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else {
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PyErr_BadArgument();
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return -1;
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}
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break;
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case T_OBJECT:
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Py_XINCREF(v);
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oldv = *(PyObject **)addr;
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*(PyObject **)addr = v;
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Py_XDECREF(oldv);
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break;
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case T_CHAR:
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if (PyString_Check(v) &&
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PyString_Size(v) == 1) {
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*(char*)addr =
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PyString_AsString(v)[0];
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}
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else {
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PyErr_BadArgument();
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return -1;
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}
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default:
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PyErr_SetString(PyExc_SystemError,
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"bad memberlist type");
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return -1;
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}
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return 0;
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}
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}
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PyErr_SetString(PyExc_AttributeError, name);
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return -1;
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}
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