AppPkg/Applications/Python/Python-2.7.10/Python/structmember.c

   1
   2 /* Map C struct members to Python object attributes */
   3
   4 #include "Python.h"
   5
   6 #include "structmember.h"
   7
   8 static PyObject *
   9 listmembers(struct memberlist *mlist)
  10 {
  11     int i, n;
  12     PyObject *v;
  13     for (n = 0; mlist[n].name != NULL; n++)
  14         ;
  15     v = PyList_New(n);
  16     if (v != NULL) {
  17         for (i = 0; i < n; i++)
  18             PyList_SetItem(v, i,
  19                            PyString_FromString(mlist[i].name));
  20         if (PyErr_Occurred()) {
  21             Py_DECREF(v);
  22             v = NULL;
  23         }
  24         else {
  25             PyList_Sort(v);
  26         }
  27     }
  28     return v;
  29 }
  30
  31 PyObject *
  32 PyMember_Get(const char *addr, struct memberlist *mlist, const char *name)
  33 {
  34     struct memberlist *l;
  35
  36     if (strcmp(name, "__members__") == 0)
  37         return listmembers(mlist);
  38     for (l = mlist; l->name != NULL; l++) {
  39         if (strcmp(l->name, name) == 0) {
  40             PyMemberDef copy;
  41             copy.name = l->name;
  42             copy.type = l->type;
  43             copy.offset = l->offset;
  44             copy.flags = l->flags;
  45             copy.doc = NULL;
  46             return PyMember_GetOne(addr, &copy);
  47         }
  48     }
  49     PyErr_SetString(PyExc_AttributeError, name);
  50     return NULL;
  51 }
  52
  53 PyObject *
  54 PyMember_GetOne(const char *addr, PyMemberDef *l)
  55 {
  56     PyObject *v;
  57     if ((l->flags & READ_RESTRICTED) &&
  58         PyEval_GetRestricted()) {
  59         PyErr_SetString(PyExc_RuntimeError, "restricted attribute");
  60         return NULL;
  61     }
  62     addr += l->offset;
  63     switch (l->type) {
  64     case T_BOOL:
  65         v = PyBool_FromLong(*(char*)addr);
  66         break;
  67     case T_BYTE:
  68         v = PyInt_FromLong(*(char*)addr);
  69         break;
  70     case T_UBYTE:
  71         v = PyLong_FromUnsignedLong(*(unsigned char*)addr);
  72         break;
  73     case T_SHORT:
  74         v = PyInt_FromLong(*(short*)addr);
  75         break;
  76     case T_USHORT:
  77         v = PyLong_FromUnsignedLong(*(unsigned short*)addr);
  78         break;
  79     case T_INT:
  80         v = PyInt_FromLong(*(int*)addr);
  81         break;
  82     case T_UINT:
  83         v = PyLong_FromUnsignedLong(*(unsigned int*)addr);
  84         break;
  85     case T_LONG:
  86         v = PyInt_FromLong(*(long*)addr);
  87         break;
  88     case T_ULONG:
  89         v = PyLong_FromUnsignedLong(*(unsigned long*)addr);
  90         break;
  91     case T_PYSSIZET:
  92         v = PyInt_FromSsize_t(*(Py_ssize_t*)addr);
  93         break;
  94     case T_FLOAT:
  95         v = PyFloat_FromDouble((double)*(float*)addr);
  96         break;
  97     case T_DOUBLE:
  98         v = PyFloat_FromDouble(*(double*)addr);
  99         break;
 100     case T_STRING:
 101         if (*(char**)addr == NULL) {
 102             Py_INCREF(Py_None);
 103             v = Py_None;
 104         }
 105         else
 106             v = PyString_FromString(*(char**)addr);
 107         break;
 108     case T_STRING_INPLACE:
 109         v = PyString_FromString((char*)addr);
 110         break;
 111     case T_CHAR:
 112         v = PyString_FromStringAndSize((char*)addr, 1);
 113         break;
 114     case T_OBJECT:
 115         v = *(PyObject **)addr;
 116         if (v == NULL)
 117             v = Py_None;
 118         Py_INCREF(v);
 119         break;
 120     case T_OBJECT_EX:
 121         v = *(PyObject **)addr;
 122         if (v == NULL)
 123             PyErr_SetString(PyExc_AttributeError, l->name);
 124         Py_XINCREF(v);
 125         break;
 126 #ifdef HAVE_LONG_LONG
 127     case T_LONGLONG:
 128         v = PyLong_FromLongLong(*(PY_LONG_LONG *)addr);
 129         break;
 130     case T_ULONGLONG:
 131         v = PyLong_FromUnsignedLongLong(*(unsigned PY_LONG_LONG *)addr);
 132         break;
 133 #endif /* HAVE_LONG_LONG */
 134     default:
 135         PyErr_SetString(PyExc_SystemError, "bad memberdescr type");
 136         v = NULL;
 137     }
 138     return v;
 139 }
 140
 141 int
 142 PyMember_Set(char *addr, struct memberlist *mlist, const char *name, PyObject *v)
 143 {
 144     struct memberlist *l;
 145
 146     for (l = mlist; l->name != NULL; l++) {
 147         if (strcmp(l->name, name) == 0) {
 148             PyMemberDef copy;
 149             copy.name = l->name;
 150             copy.type = l->type;
 151             copy.offset = l->offset;
 152             copy.flags = l->flags;
 153             copy.doc = NULL;
 154             return PyMember_SetOne(addr, &copy, v);
 155         }
 156     }
 157
 158     PyErr_SetString(PyExc_AttributeError, name);
 159     return -1;
 160 }
 161
 162 #define WARN(msg)                                       \
 163     do {                                                \
 164     if (PyErr_Warn(PyExc_RuntimeWarning, msg) < 0)      \
 165         return -1;                                      \
 166     } while (0)
 167
 168 int
 169 PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
 170 {
 171     PyObject *oldv;
 172
 173     addr += l->offset;
 174
 175     if ((l->flags & READONLY))
 176     {
 177         PyErr_SetString(PyExc_TypeError, "readonly attribute");
 178         return -1;
 179     }
 180     if ((l->flags & PY_WRITE_RESTRICTED) && PyEval_GetRestricted()) {
 181         PyErr_SetString(PyExc_RuntimeError, "restricted attribute");
 182         return -1;
 183     }
 184     if (v == NULL) {
 185         if (l->type == T_OBJECT_EX) {
 186             /* Check if the attribute is set. */
 187             if (*(PyObject **)addr == NULL) {
 188                 PyErr_SetString(PyExc_AttributeError, l->name);
 189                 return -1;
 190             }
 191         }
 192         else if (l->type != T_OBJECT) {
 193             PyErr_SetString(PyExc_TypeError,
 194                             "can't delete numeric/char attribute");
 195             return -1;
 196         }
 197     }
 198     switch (l->type) {
 199     case T_BOOL:{
 200         if (!PyBool_Check(v)) {
 201             PyErr_SetString(PyExc_TypeError,
 202                             "attribute value type must be bool");
 203             return -1;
 204         }
 205         if (v == Py_True)
 206             *(char*)addr = (char) 1;
 207         else
 208             *(char*)addr = (char) 0;
 209         break;
 210         }
 211     case T_BYTE:{
 212         long long_val = PyInt_AsLong(v);
 213         if ((long_val == -1) && PyErr_Occurred())
 214             return -1;
 215         *(char*)addr = (char)long_val;
 216         /* XXX: For compatibility, only warn about truncations
 217            for now. */
 218         if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))
 219             WARN("Truncation of value to char");
 220         break;
 221         }
 222     case T_UBYTE:{
 223         long long_val = PyInt_AsLong(v);
 224         if ((long_val == -1) && PyErr_Occurred())
 225             return -1;
 226         *(unsigned char*)addr = (unsigned char)long_val;
 227         if ((long_val > UCHAR_MAX) || (long_val < 0))
 228             WARN("Truncation of value to unsigned char");
 229         break;
 230         }
 231     case T_SHORT:{
 232         long long_val = PyInt_AsLong(v);
 233         if ((long_val == -1) && PyErr_Occurred())
 234             return -1;
 235         *(short*)addr = (short)long_val;
 236         if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))
 237             WARN("Truncation of value to short");
 238         break;
 239         }
 240     case T_USHORT:{
 241         long long_val = PyInt_AsLong(v);
 242         if ((long_val == -1) && PyErr_Occurred())
 243             return -1;
 244         *(unsigned short*)addr = (unsigned short)long_val;
 245         if ((long_val > USHRT_MAX) || (long_val < 0))
 246             WARN("Truncation of value to unsigned short");
 247         break;
 248         }
 249     case T_INT:{
 250         long long_val = PyInt_AsLong(v);
 251         if ((long_val == -1) && PyErr_Occurred())
 252             return -1;
 253         *(int *)addr = (int)long_val;
 254         if ((long_val > INT_MAX) || (long_val < INT_MIN))
 255             WARN("Truncation of value to int");
 256         break;
 257         }
 258     case T_UINT:{
 259         unsigned long ulong_val = PyLong_AsUnsignedLong(v);
 260         if ((ulong_val == (unsigned long)-1) && PyErr_Occurred()) {
 261             /* XXX: For compatibility, accept negative int values
 262                as well. */
 263             PyErr_Clear();
 264             ulong_val = PyLong_AsLong(v);
 265             if ((ulong_val == (unsigned long)-1) &&
 266                 PyErr_Occurred())
 267                 return -1;
 268             *(unsigned int *)addr = (unsigned int)ulong_val;
 269             WARN("Writing negative value into unsigned field");
 270         } else
 271             *(unsigned int *)addr = (unsigned int)ulong_val;
 272         if (ulong_val > UINT_MAX)
 273             WARN("Truncation of value to unsigned int");
 274         break;
 275         }
 276     case T_LONG:{
 277         *(long*)addr = PyLong_AsLong(v);
 278         if ((*(long*)addr == -1) && PyErr_Occurred())
 279             return -1;
 280         break;
 281         }
 282     case T_ULONG:{
 283         *(unsigned long*)addr = PyLong_AsUnsignedLong(v);
 284         if ((*(unsigned long*)addr == (unsigned long)-1)
 285             && PyErr_Occurred()) {
 286             /* XXX: For compatibility, accept negative int values
 287                as well. */
 288             PyErr_Clear();
 289             *(unsigned long*)addr = PyLong_AsLong(v);
 290             if ((*(unsigned long*)addr == (unsigned long)-1)
 291                 && PyErr_Occurred())
 292                 return -1;
 293             WARN("Writing negative value into unsigned field");
 294         }
 295         break;
 296         }
 297     case T_PYSSIZET:{
 298         *(Py_ssize_t*)addr = PyInt_AsSsize_t(v);
 299         if ((*(Py_ssize_t*)addr == (Py_ssize_t)-1)
 300             && PyErr_Occurred())
 301                         return -1;
 302         break;
 303         }
 304     case T_FLOAT:{
 305         double double_val = PyFloat_AsDouble(v);
 306         if ((double_val == -1) && PyErr_Occurred())
 307             return -1;
 308         *(float*)addr = (float)double_val;
 309         break;
 310         }
 311     case T_DOUBLE:
 312         *(double*)addr = PyFloat_AsDouble(v);
 313         if ((*(double*)addr == -1) && PyErr_Occurred())
 314             return -1;
 315         break;
 316     case T_OBJECT:
 317     case T_OBJECT_EX:
 318         Py_XINCREF(v);
 319         oldv = *(PyObject **)addr;
 320         *(PyObject **)addr = v;
 321         Py_XDECREF(oldv);
 322         break;
 323     case T_CHAR:
 324         if (PyString_Check(v) && PyString_Size(v) == 1) {
 325             *(char*)addr = PyString_AsString(v)[0];
 326         }
 327         else {
 328             PyErr_BadArgument();
 329             return -1;
 330         }
 331         break;
 332     case T_STRING:
 333     case T_STRING_INPLACE:
 334         PyErr_SetString(PyExc_TypeError, "readonly attribute");
 335         return -1;
 336 #ifdef HAVE_LONG_LONG
 337     case T_LONGLONG:{
 338         PY_LONG_LONG value;
 339         *(PY_LONG_LONG*)addr = value = PyLong_AsLongLong(v);
 340         if ((value == -1) && PyErr_Occurred())
 341             return -1;
 342         break;
 343         }
 344     case T_ULONGLONG:{
 345         unsigned PY_LONG_LONG value;
 346         /* ??? PyLong_AsLongLong accepts an int, but PyLong_AsUnsignedLongLong
 347             doesn't ??? */
 348         if (PyLong_Check(v))
 349             *(unsigned PY_LONG_LONG*)addr = value = PyLong_AsUnsignedLongLong(v);
 350         else
 351             *(unsigned PY_LONG_LONG*)addr = value = PyInt_AsLong(v);
 352         if ((value == (unsigned PY_LONG_LONG)-1) && PyErr_Occurred())
 353             return -1;
 354         break;
 355         }
 356 #endif /* HAVE_LONG_LONG */
 357     default:
 358         PyErr_Format(PyExc_SystemError,
 359                      "bad memberdescr type for %s", l->name);
 360         return -1;
 361     }
 362     return 0;
 363 }