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annotate Python/structmember.c @ 40997:be68da561dcd 2.5

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Fix constantification of None.
author Raymond Hettinger <python@rcn.com>
date Fri, 02 Mar 2007 19:19:05 +0000
parents 0e83f8c5d70a
children 7c9225da5f61
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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2 /* Map C struct members to Python object attributes */
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3
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4 #include "Python.h"
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5
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6 #include "structmember.h"
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7
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8 static PyObject *
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9 listmembers(struct memberlist *mlist)
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10 {
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11 int i, n;
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12 PyObject *v;
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13 for (n = 0; mlist[n].name != NULL; n++)
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14 ;
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15 v = PyList_New(n);
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16 if (v != NULL) {
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17 for (i = 0; i < n; i++)
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18 PyList_SetItem(v, i,
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19 PyString_FromString(mlist[i].name));
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20 if (PyErr_Occurred()) {
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21 Py_DECREF(v);
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22 v = NULL;
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23 }
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24 else {
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25 PyList_Sort(v);
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26 }
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27 }
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28 return v;
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29 }
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30
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31 PyObject *
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32 PyMember_Get(const char *addr, struct memberlist *mlist, const char *name)
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33 {
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34 struct memberlist *l;
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35
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36 if (strcmp(name, "__members__") == 0)
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37 return listmembers(mlist);
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38 for (l = mlist; l->name != NULL; l++) {
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39 if (strcmp(l->name, name) == 0) {
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40 PyMemberDef copy;
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41 copy.name = l->name;
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42 copy.type = l->type;
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43 copy.offset = l->offset;
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44 copy.flags = l->flags;
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45 copy.doc = NULL;
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46 return PyMember_GetOne(addr, &copy);
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47 }
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48 }
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49 PyErr_SetString(PyExc_AttributeError, name);
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50 return NULL;
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51 }
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52
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53 PyObject *
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54 PyMember_GetOne(const char *addr, PyMemberDef *l)
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55 {
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56 PyObject *v;
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57 if ((l->flags & READ_RESTRICTED) &&
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58 PyEval_GetRestricted()) {
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59 PyErr_SetString(PyExc_RuntimeError, "restricted attribute");
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60 return NULL;
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61 }
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62 addr += l->offset;
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63 switch (l->type) {
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64 case T_BYTE:
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65 v = PyInt_FromLong(*(char*)addr);
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66 break;
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67 case T_UBYTE:
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68 v = PyLong_FromUnsignedLong(*(unsigned char*)addr);
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69 break;
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70 case T_SHORT:
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71 v = PyInt_FromLong(*(short*)addr);
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72 break;
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73 case T_USHORT:
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74 v = PyLong_FromUnsignedLong(*(unsigned short*)addr);
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75 break;
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76 case T_INT:
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77 v = PyInt_FromLong(*(int*)addr);
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78 break;
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79 case T_UINT:
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80 v = PyLong_FromUnsignedLong(*(unsigned int*)addr);
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81 break;
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82 case T_LONG:
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83 v = PyInt_FromLong(*(long*)addr);
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84 break;
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85 case T_ULONG:
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86 v = PyLong_FromUnsignedLong(*(unsigned long*)addr);
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87 break;
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88 case T_FLOAT:
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89 v = PyFloat_FromDouble((double)*(float*)addr);
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90 break;
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91 case T_DOUBLE:
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92 v = PyFloat_FromDouble(*(double*)addr);
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93 break;
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94 case T_STRING:
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95 if (*(char**)addr == NULL) {
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96 Py_INCREF(Py_None);
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97 v = Py_None;
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98 }
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99 else
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100 v = PyString_FromString(*(char**)addr);
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101 break;
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102 case T_STRING_INPLACE:
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103 v = PyString_FromString((char*)addr);
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104 break;
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105 case T_CHAR:
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106 v = PyString_FromStringAndSize((char*)addr, 1);
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107 break;
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108 case T_OBJECT:
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109 v = *(PyObject **)addr;
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110 if (v == NULL)
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111 v = Py_None;
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112 Py_INCREF(v);
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113 break;
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114 case T_OBJECT_EX:
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115 v = *(PyObject **)addr;
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116 if (v == NULL)
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117 PyErr_SetString(PyExc_AttributeError, l->name);
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118 Py_XINCREF(v);
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119 break;
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120 #ifdef HAVE_LONG_LONG
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121 case T_LONGLONG:
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122 v = PyLong_FromLongLong(*(PY_LONG_LONG *)addr);
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123 break;
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124 case T_ULONGLONG:
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125 v = PyLong_FromUnsignedLongLong(*(unsigned PY_LONG_LONG *)addr);
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126 break;
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127 #endif /* HAVE_LONG_LONG */
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128 default:
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129 PyErr_SetString(PyExc_SystemError, "bad memberdescr type");
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130 v = NULL;
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131 }
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132 return v;
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133 }
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134
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135 int
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136 PyMember_Set(char *addr, struct memberlist *mlist, const char *name, PyObject *v)
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137 {
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138 struct memberlist *l;
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139
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140 for (l = mlist; l->name != NULL; l++) {
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parents:
diff changeset
141 if (strcmp(l->name, name) == 0) {
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diff changeset
142 PyMemberDef copy;
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diff changeset
143 copy.name = l->name;
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diff changeset
144 copy.type = l->type;
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diff changeset
145 copy.offset = l->offset;
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diff changeset
146 copy.flags = l->flags;
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diff changeset
147 copy.doc = NULL;
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diff changeset
148 return PyMember_SetOne(addr, &copy, v);
86
a6934380c6e7 "Compiling" version
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diff changeset
149 }
a6934380c6e7 "Compiling" version
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parents:
diff changeset
150 }
20012
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diff changeset
151
5373
5880384d7c71 Quickly renamed the remaining files -- this directory is done.
Guido van Rossum <guido@python.org>
parents: 5287
diff changeset
152 PyErr_SetString(PyExc_AttributeError, name);
95
a5bf7d5959ce Return -1 for errors.
Guido van Rossum <guido@python.org>
parents: 86
diff changeset
153 return -1;
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
154 }
20012
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diff changeset
155
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
156 int
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diff changeset
157 PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
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diff changeset
158 {
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
159 PyObject *oldv;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
160
30979
86fdf8fe7f17 Getting rid of all the code inside #ifdef macintosh too.
Jack Jansen <jack.jansen@cwi.nl>
parents: 21187
diff changeset
161 if ((l->flags & READONLY) || l->type == T_STRING)
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diff changeset
162 {
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diff changeset
163 PyErr_SetString(PyExc_TypeError, "readonly attribute");
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164 return -1;
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165 }
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diff changeset
166 if ((l->flags & WRITE_RESTRICTED) && PyEval_GetRestricted()) {
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diff changeset
167 PyErr_SetString(PyExc_RuntimeError, "restricted attribute");
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diff changeset
168 return -1;
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169 }
21187
ef6f692c76e2 Fix SF bug #486144: Uninitialized __slot__ vrbl is None.
Guido van Rossum <guido@python.org>
parents: 20456
diff changeset
170 if (v == NULL && l->type != T_OBJECT_EX && l->type != T_OBJECT) {
20012
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diff changeset
171 PyErr_SetString(PyExc_TypeError,
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
172 "can't delete numeric/char attribute");
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diff changeset
173 return -1;
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diff changeset
174 }
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diff changeset
175 addr += l->offset;
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diff changeset
176 switch (l->type) {
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diff changeset
177 case T_BYTE:{
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diff changeset
178 long long_val;
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diff changeset
179 long_val = PyInt_AsLong(v);
0e83f8c5d70a [Backport of r52452]
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diff changeset
180 if ((long_val == -1) && PyErr_Occurred())
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diff changeset
181 return -1;
40177
0e83f8c5d70a [Backport of r52452]
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diff changeset
182 *(char*)addr = (char)long_val;
0e83f8c5d70a [Backport of r52452]
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diff changeset
183 break;
20012
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diff changeset
184 }
40177
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diff changeset
185 case T_UBYTE:{
0e83f8c5d70a [Backport of r52452]
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diff changeset
186 long long_val;
0e83f8c5d70a [Backport of r52452]
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diff changeset
187 long_val = PyInt_AsLong(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
188 if ((long_val == -1) && PyErr_Occurred())
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diff changeset
189 return -1;
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diff changeset
190 *(unsigned char*)addr = (unsigned char)long_val;
20012
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diff changeset
191 break;
40177
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diff changeset
192 }
0e83f8c5d70a [Backport of r52452]
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diff changeset
193 case T_SHORT:{
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diff changeset
194 long long_val;
0e83f8c5d70a [Backport of r52452]
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diff changeset
195 long_val = PyInt_AsLong(v);
0e83f8c5d70a [Backport of r52452]
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diff changeset
196 if ((long_val == -1) && PyErr_Occurred())
20012
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diff changeset
197 return -1;
40177
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diff changeset
198 *(short*)addr = (short)long_val;
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diff changeset
199 break;
20012
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diff changeset
200 }
40177
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diff changeset
201 case T_USHORT:{
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
202 long long_val;
0e83f8c5d70a [Backport of r52452]
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diff changeset
203 long_val = PyInt_AsLong(v);
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diff changeset
204 if ((long_val == -1) && PyErr_Occurred())
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diff changeset
205 return -1;
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diff changeset
206 *(unsigned short*)addr = (unsigned short)long_val;
20012
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diff changeset
207 break;
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diff changeset
208 }
40177
0e83f8c5d70a [Backport of r52452]
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diff changeset
209 case T_INT:{
0e83f8c5d70a [Backport of r52452]
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diff changeset
210 long long_val;
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
211 long_val = PyInt_AsLong(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
212 if ((long_val == -1) && PyErr_Occurred())
20012
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diff changeset
213 return -1;
40177
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diff changeset
214 *(int *)addr = (int)long_val;
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
215 break;
20012
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diff changeset
216 }
40177
0e83f8c5d70a [Backport of r52452]
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diff changeset
217 case T_UINT:{
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
218 unsigned long ulong_val;
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
219 ulong_val = PyLong_AsUnsignedLong(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
220 if ((ulong_val == (unsigned int)-1) && PyErr_Occurred()) {
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
221 /* XXX: For compatibility, accept negative int values
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
222 as well. */
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
223 PyErr_Clear();
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
224 ulong_val = PyLong_AsLong(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
225 if ((ulong_val == (unsigned int)-1) && PyErr_Occurred())
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
226 return -1;
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
227 }
0e83f8c5d70a [Backport of r52452]
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diff changeset
228 *(unsigned int *)addr = (unsigned int)ulong_val;
20012
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Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
229 break;
40177
0e83f8c5d70a [Backport of r52452]
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diff changeset
230 }
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
231 case T_LONG:{
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
232 *(long*)addr = PyLong_AsLong(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
233 if ((*(long*)addr == -1) && PyErr_Occurred())
20012
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diff changeset
234 return -1;
40177
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
235 break;
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
236 }
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
237 case T_ULONG:{
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
238 *(unsigned long*)addr = PyLong_AsUnsignedLong(v);
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
239 if ((*(unsigned long*)addr == (unsigned long)-1)
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
240 && PyErr_Occurred()) {
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
241 /* XXX: For compatibility, accept negative int values
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
242 as well. */
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
243 PyErr_Clear();
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
244 *(unsigned long*)addr = PyLong_AsLong(v);
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
245 if ((*(unsigned long*)addr == (unsigned int)-1) && PyErr_Occurred())
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
246 return -1;
20012
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Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
247 }
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
248 break;
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Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
249 }
40177
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
250 case T_FLOAT:{
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
251 double double_val;
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
252 double_val = PyFloat_AsDouble(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
253 if ((double_val == -1) && PyErr_Occurred())
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
254 return -1;
0e83f8c5d70a [Backport of r52452]
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
255 *(float*)addr = (float)double_val;
20012
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Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
256 break;
40177
0e83f8c5d70a [Backport of r52452]
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diff changeset
257 }
20012
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diff changeset
258 case T_DOUBLE:
40177
0e83f8c5d70a [Backport of r52452]
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diff changeset
259 *(double*)addr = PyFloat_AsDouble(v);
0e83f8c5d70a [Backport of r52452]
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parents: 38024
diff changeset
260 if ((*(double*)addr == -1) && PyErr_Occurred())
20012
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Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
261 return -1;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
262 break;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
263 case T_OBJECT:
21187
ef6f692c76e2 Fix SF bug #486144: Uninitialized __slot__ vrbl is None.
Guido van Rossum <guido@python.org>
parents: 20456
diff changeset
264 case T_OBJECT_EX:
20012
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Guido van Rossum <guido@python.org>
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diff changeset
265 Py_XINCREF(v);
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
266 oldv = *(PyObject **)addr;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
267 *(PyObject **)addr = v;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
268 Py_XDECREF(oldv);
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
269 break;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
270 case T_CHAR:
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
271 if (PyString_Check(v) && PyString_Size(v) == 1) {
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
272 *(char*)addr = PyString_AsString(v)[0];
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Guido van Rossum <guido@python.org>
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273 }
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274 else {
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275 PyErr_BadArgument();
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276 return -1;
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277 }
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278 break;
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279 #ifdef HAVE_LONG_LONG
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280 case T_LONGLONG:
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281 if (!PyLong_Check(v)) {
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282 PyErr_BadArgument();
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283 return -1;
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284 } else {
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285 PY_LONG_LONG value;
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286 *(PY_LONG_LONG*)addr = value = PyLong_AsLongLong(v);
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287 if ((value == -1) && PyErr_Occurred()) {
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288 return -1;
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289 }
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290 }
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291 break;
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292 case T_ULONGLONG:
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293 if (!PyLong_Check(v)) {
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294 PyErr_BadArgument();
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295 return -1;
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296 } else {
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297 unsigned PY_LONG_LONG value;
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298 *(unsigned PY_LONG_LONG*)addr = value = PyLong_AsUnsignedLongLong(v);
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299 if ((value == (unsigned PY_LONG_LONG)-1) &&
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300 PyErr_Occurred()) {
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301 return -1;
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302 }
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303 }
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304 break;
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305 #endif /* HAVE_LONG_LONG */
20012
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306 default:
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307 PyErr_Format(PyExc_SystemError,
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308 "bad memberdescr type for %s", l->name);
20012
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309 return -1;
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310 }
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311 return 0;
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312 }