Mercurial > cpython-lru_cache-weakref

annotate Python/structmember.c @ 42083:37189e375ec7 legacy-trunk

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Add T_PYSSIZET in structmember.h: This can be used for Py_ssize_t members. Simplify the implementation of UnicodeError objects: start and end attributes are now stored directly as Py_ssize_t members, which simplifies various get and set functions.
author Walter Dörwald <walter@livinglogic.de>
date Wed, 13 Jun 2007 16:57:12 +0000
parents e8413971212d
children 648577cc688a
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_PYSSIZET:
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89 v = PyInt_FromSsize_t(*(Py_ssize_t*)addr);
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90 break;
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91 case T_FLOAT:
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92 v = PyFloat_FromDouble((double)*(float*)addr);
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93 break;
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94 case T_DOUBLE:
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95 v = PyFloat_FromDouble(*(double*)addr);
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96 break;
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97 case T_STRING:
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98 if (*(char**)addr == NULL) {
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99 Py_INCREF(Py_None);
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100 v = Py_None;
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101 }
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102 else
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103 v = PyString_FromString(*(char**)addr);
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104 break;
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105 case T_STRING_INPLACE:
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106 v = PyString_FromString((char*)addr);
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107 break;
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108 case T_CHAR:
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109 v = PyString_FromStringAndSize((char*)addr, 1);
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110 break;
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111 case T_OBJECT:
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112 v = *(PyObject **)addr;
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113 if (v == NULL)
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114 v = Py_None;
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115 Py_INCREF(v);
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116 break;
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117 case T_OBJECT_EX:
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118 v = *(PyObject **)addr;
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119 if (v == NULL)
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120 PyErr_SetString(PyExc_AttributeError, l->name);
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121 Py_XINCREF(v);
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122 break;
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123 #ifdef HAVE_LONG_LONG
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124 case T_LONGLONG:
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125 v = PyLong_FromLongLong(*(PY_LONG_LONG *)addr);
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126 break;
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127 case T_ULONGLONG:
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128 v = PyLong_FromUnsignedLongLong(*(unsigned PY_LONG_LONG *)addr);
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129 break;
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130 #endif /* HAVE_LONG_LONG */
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131 default:
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132 PyErr_SetString(PyExc_SystemError, "bad memberdescr type");
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133 v = NULL;
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134 }
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135 return v;
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136 }
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137
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138 int
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Tim Peters <tim.peters@gmail.com>
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139 PyMember_Set(char *addr, struct memberlist *mlist, const char *name, PyObject *v)
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140 {
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141 struct memberlist *l;
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142
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143 for (l = mlist; l->name != NULL; l++) {
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144 if (strcmp(l->name, name) == 0) {
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145 PyMemberDef copy;
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146 copy.name = l->name;
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147 copy.type = l->type;
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148 copy.offset = l->offset;
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149 copy.flags = l->flags;
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150 copy.doc = NULL;
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151 return PyMember_SetOne(addr, &copy, v);
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152 }
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153 }
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154
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155 PyErr_SetString(PyExc_AttributeError, name);
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a5bf7d5959ce Return -1 for errors.
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156 return -1;
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157 }
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158
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159 int
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160 PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
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161 {
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162 PyObject *oldv;
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163
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Jack Jansen <jack.jansen@cwi.nl>
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164 if ((l->flags & READONLY) || l->type == T_STRING)
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165 {
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166 PyErr_SetString(PyExc_TypeError, "readonly attribute");
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167 return -1;
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168 }
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169 if ((l->flags & WRITE_RESTRICTED) && PyEval_GetRestricted()) {
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170 PyErr_SetString(PyExc_RuntimeError, "restricted attribute");
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171 return -1;
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172 }
21187
ef6f692c76e2 Fix SF bug #486144: Uninitialized __slot__ vrbl is None.
Guido van Rossum <guido@python.org>
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173 if (v == NULL && l->type != T_OBJECT_EX && l->type != T_OBJECT) {
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174 PyErr_SetString(PyExc_TypeError,
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175 "can't delete numeric/char attribute");
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176 return -1;
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177 }
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178 addr += l->offset;
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179 switch (l->type) {
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180 case T_BYTE:{
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181 long long_val;
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182 long_val = PyInt_AsLong(v);
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183 if ((long_val == -1) && PyErr_Occurred())
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184 return -1;
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185 /* XXX: For compatibility, only warn about truncations
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186 for now. */
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187 if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))
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188 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to char");
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189 *(char*)addr = (char)long_val;
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190 break;
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191 }
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192 case T_UBYTE:{
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193 long long_val;
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194 long_val = PyInt_AsLong(v);
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195 if ((long_val == -1) && PyErr_Occurred())
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196 return -1;
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197 if ((long_val > UCHAR_MAX) || (long_val < 0))
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198 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to unsigned char");
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199 *(unsigned char*)addr = (unsigned char)long_val;
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200 break;
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201 }
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202 case T_SHORT:{
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203 long long_val;
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204 long_val = PyInt_AsLong(v);
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205 if ((long_val == -1) && PyErr_Occurred())
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206 return -1;
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207 if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))
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208 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to short");
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209 *(short*)addr = (short)long_val;
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210 break;
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211 }
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diff changeset
212 case T_USHORT:{
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213 long long_val;
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diff changeset
214 long_val = PyInt_AsLong(v);
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diff changeset
215 if ((long_val == -1) && PyErr_Occurred())
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diff changeset
216 return -1;
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diff changeset
217 if ((long_val > USHRT_MAX) || (long_val < 0))
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
218 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to unsigned short");
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diff changeset
219 *(unsigned short*)addr = (unsigned short)long_val;
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220 break;
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221 }
40176
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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222 case T_INT:{
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diff changeset
223 long long_val;
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diff changeset
224 long_val = PyInt_AsLong(v);
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diff changeset
225 if ((long_val == -1) && PyErr_Occurred())
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226 return -1;
40176
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diff changeset
227 if ((long_val > INT_MAX) || (long_val < INT_MIN))
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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228 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to int");
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229 *(int *)addr = (int)long_val;
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diff changeset
230 break;
40176
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diff changeset
231 }
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diff changeset
232 case T_UINT:{
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233 unsigned long ulong_val;
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diff changeset
234 ulong_val = PyLong_AsUnsignedLong(v);
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diff changeset
235 if ((ulong_val == (unsigned int)-1) && PyErr_Occurred()) {
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diff changeset
236 /* XXX: For compatibility, accept negative int values
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diff changeset
237 as well. */
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
238 PyErr_Clear();
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diff changeset
239 ulong_val = PyLong_AsLong(v);
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diff changeset
240 if ((ulong_val == (unsigned int)-1) && PyErr_Occurred())
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
241 return -1;
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diff changeset
242 PyErr_Warn(PyExc_RuntimeWarning, "Writing negative value into unsigned field");
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
243 }
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diff changeset
244 if (ulong_val > UINT_MAX)
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diff changeset
245 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to unsigned int");
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diff changeset
246 *(unsigned int *)addr = (unsigned int)ulong_val;
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diff changeset
247 break;
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diff changeset
248 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
249 case T_LONG:{
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diff changeset
250 *(long*)addr = PyLong_AsLong(v);
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diff changeset
251 if ((*(long*)addr == -1) && PyErr_Occurred())
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252 return -1;
40176
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diff changeset
253 break;
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
254 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
255 case T_ULONG:{
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diff changeset
256 *(unsigned long*)addr = PyLong_AsUnsignedLong(v);
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diff changeset
257 if ((*(unsigned long*)addr == (unsigned long)-1)
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
258 && PyErr_Occurred()) {
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diff changeset
259 /* XXX: For compatibility, accept negative int values
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
260 as well. */
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diff changeset
261 PyErr_Clear();
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diff changeset
262 *(unsigned long*)addr = PyLong_AsLong(v);
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diff changeset
263 if ((*(unsigned long*)addr == (unsigned int)-1) && PyErr_Occurred())
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264 return -1;
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265 PyErr_Warn(PyExc_RuntimeWarning, "Writing negative value into unsigned field");
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266 }
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267 break;
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268 }
42083
37189e375ec7 Add T_PYSSIZET in structmember.h: This can be used for
Walter Dörwald <walter@livinglogic.de>
parents: 42007
diff changeset
269 case T_PYSSIZET:{
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270 *(Py_ssize_t*)addr = PyInt_AsSsize_t(v);
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parents: 42007
diff changeset
271 if ((*(Py_ssize_t*)addr == (Py_ssize_t)-1)
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Walter Dörwald <walter@livinglogic.de>
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272 && PyErr_Occurred())
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273 return -1;
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parents: 42007
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274 break;
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Walter Dörwald <walter@livinglogic.de>
parents: 42007
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275 }
40176
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276 case T_FLOAT:{
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277 double double_val;
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278 double_val = PyFloat_AsDouble(v);
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diff changeset
279 if ((double_val == -1) && PyErr_Occurred())
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280 return -1;
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diff changeset
281 *(float*)addr = (float)double_val;
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282 break;
40176
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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parents: 38024
diff changeset
283 }
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284 case T_DOUBLE:
40176
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285 *(double*)addr = PyFloat_AsDouble(v);
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parents: 38024
diff changeset
286 if ((*(double*)addr == -1) && PyErr_Occurred())
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diff changeset
287 return -1;
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288 break;
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diff changeset
289 case T_OBJECT:
21187
ef6f692c76e2 Fix SF bug #486144: Uninitialized __slot__ vrbl is None.
Guido van Rossum <guido@python.org>
parents: 20456
diff changeset
290 case T_OBJECT_EX:
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291 Py_XINCREF(v);
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292 oldv = *(PyObject **)addr;
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293 *(PyObject **)addr = v;
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Guido van Rossum <guido@python.org>
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294 Py_XDECREF(oldv);
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
295 break;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
296 case T_CHAR:
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297 if (PyString_Check(v) && PyString_Size(v) == 1) {
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298 *(char*)addr = PyString_AsString(v)[0];
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Guido van Rossum <guido@python.org>
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diff changeset
299 }
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
300 else {
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Guido van Rossum <guido@python.org>
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diff changeset
301 PyErr_BadArgument();
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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diff changeset
302 return -1;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
303 }
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
304 break;
34677
e9ffad6d8822 Patch #1115086: support PY_LONGLONG in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 30979
diff changeset
305 #ifdef HAVE_LONG_LONG
42007
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Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
306 case T_LONGLONG:{
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
307 PY_LONG_LONG value;
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
308 *(PY_LONG_LONG*)addr = value = PyLong_AsLongLong(v);
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
309 if ((value == -1) && PyErr_Occurred())
34677
e9ffad6d8822 Patch #1115086: support PY_LONGLONG in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 30979
diff changeset
310 return -1;
42007
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
311 break;
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
312 }
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
313 case T_ULONGLONG:{
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
314 unsigned PY_LONG_LONG value;
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
315 /* ??? PyLong_AsLongLong accepts an int, but PyLong_AsUnsignedLongLong
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
316 doesn't ??? */
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
317 if (PyLong_Check(v))
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
318 *(unsigned PY_LONG_LONG*)addr = value = PyLong_AsUnsignedLongLong(v);
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
319 else
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
320 *(unsigned PY_LONG_LONG*)addr = value = PyInt_AsLong(v);
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
321 if ((value == (unsigned PY_LONG_LONG)-1) && PyErr_Occurred())
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
322 return -1;
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
323 break;
e8413971212d Patch #1733960: Allow T_LONGLONG to accept ints.
Martin v. Löwis <martin@v.loewis.de>
parents: 40176
diff changeset
324 }
34677
e9ffad6d8822 Patch #1115086: support PY_LONGLONG in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 30979
diff changeset
325 #endif /* HAVE_LONG_LONG */
20012
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Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
326 default:
20456
bff6c2d76f33 Put descr name in "bad memberdescr type" error message.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 20012
diff changeset
327 PyErr_Format(PyExc_SystemError,
bff6c2d76f33 Put descr name in "bad memberdescr type" error message.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 20012
diff changeset
328 "bad memberdescr type for %s", l->name);
20012
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
329 return -1;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
330 }
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
331 return 0;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
parents: 19942
diff changeset
332 }