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annotate Python/structmember.c @ 40176:0c1cb92dac97 legacy-trunk

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Patch #1549049: Rewrite type conversion in structmember. Fixes #1545696 and #1566140. Will backport to 2.5.
author Martin v. Löwis <martin@v.loewis.de>
date Fri, 27 Oct 2006 06:16:31 +0000
parents 8bc4a7e5fef8
children e8413971212d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
86
a6934380c6e7 "Compiling" version
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140 for (l = mlist; l->name != NULL; l++) {
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141 if (strcmp(l->name, name) == 0) {
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142 PyMemberDef copy;
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143 copy.name = l->name;
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144 copy.type = l->type;
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145 copy.offset = l->offset;
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146 copy.flags = l->flags;
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147 copy.doc = NULL;
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148 return PyMember_SetOne(addr, &copy, v);
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149 }
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150 }
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151
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5880384d7c71 Quickly renamed the remaining files -- this directory is done.
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152 PyErr_SetString(PyExc_AttributeError, name);
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a5bf7d5959ce Return -1 for errors.
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153 return -1;
86
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154 }
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155
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156 int
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157 PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
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158 {
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159 PyObject *oldv;
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160
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86fdf8fe7f17 Getting rid of all the code inside #ifdef macintosh too.
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161 if ((l->flags & READONLY) || l->type == T_STRING)
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162 {
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163 PyErr_SetString(PyExc_TypeError, "readonly attribute");
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164 return -1;
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165 }
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166 if ((l->flags & WRITE_RESTRICTED) && PyEval_GetRestricted()) {
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167 PyErr_SetString(PyExc_RuntimeError, "restricted attribute");
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168 return -1;
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169 }
21187
ef6f692c76e2 Fix SF bug #486144: Uninitialized __slot__ vrbl is None.
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170 if (v == NULL && l->type != T_OBJECT_EX && l->type != T_OBJECT) {
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171 PyErr_SetString(PyExc_TypeError,
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172 "can't delete numeric/char attribute");
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173 return -1;
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174 }
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175 addr += l->offset;
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176 switch (l->type) {
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177 case T_BYTE:{
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178 long long_val;
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179 long_val = PyInt_AsLong(v);
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180 if ((long_val == -1) && PyErr_Occurred())
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181 return -1;
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182 /* XXX: For compatibility, only warn about truncations
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183 for now. */
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184 if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))
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185 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to char");
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186 *(char*)addr = (char)long_val;
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187 break;
40176
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188 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
189 case T_UBYTE:{
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190 long long_val;
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diff changeset
191 long_val = PyInt_AsLong(v);
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192 if ((long_val == -1) && PyErr_Occurred())
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193 return -1;
40176
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194 if ((long_val > UCHAR_MAX) || (long_val < 0))
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195 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to unsigned char");
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196 *(unsigned char*)addr = (unsigned char)long_val;
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197 break;
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198 }
40176
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199 case T_SHORT:{
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200 long long_val;
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diff changeset
201 long_val = PyInt_AsLong(v);
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diff changeset
202 if ((long_val == -1) && PyErr_Occurred())
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203 return -1;
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diff changeset
204 if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
205 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to short");
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diff changeset
206 *(short*)addr = (short)long_val;
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diff changeset
207 break;
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diff changeset
208 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
209 case T_USHORT:{
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diff changeset
210 long long_val;
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diff changeset
211 long_val = PyInt_AsLong(v);
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diff changeset
212 if ((long_val == -1) && PyErr_Occurred())
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
213 return -1;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
214 if ((long_val > USHRT_MAX) || (long_val < 0))
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
215 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to unsigned short");
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
216 *(unsigned short*)addr = (unsigned short)long_val;
20012
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diff changeset
217 break;
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diff changeset
218 }
40176
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
219 case T_INT:{
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
220 long long_val;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
221 long_val = PyInt_AsLong(v);
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
222 if ((long_val == -1) && PyErr_Occurred())
20012
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diff changeset
223 return -1;
40176
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
224 if ((long_val > INT_MAX) || (long_val < INT_MIN))
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
225 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to int");
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
226 *(int *)addr = (int)long_val;
20012
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diff changeset
227 break;
40176
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
228 }
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diff changeset
229 case T_UINT:{
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diff changeset
230 unsigned long ulong_val;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
231 ulong_val = PyLong_AsUnsignedLong(v);
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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parents: 38024
diff changeset
232 if ((ulong_val == (unsigned int)-1) && PyErr_Occurred()) {
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
233 /* XXX: For compatibility, accept negative int values
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
234 as well. */
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
235 PyErr_Clear();
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
236 ulong_val = PyLong_AsLong(v);
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
237 if ((ulong_val == (unsigned int)-1) && PyErr_Occurred())
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
238 return -1;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
239 PyErr_Warn(PyExc_RuntimeWarning, "Writing negative value into unsigned field");
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
240 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
241 if (ulong_val > UINT_MAX)
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
242 PyErr_Warn(PyExc_RuntimeWarning, "Truncation of value to unsigned int");
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
243 *(unsigned int *)addr = (unsigned int)ulong_val;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
244 break;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
245 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
246 case T_LONG:{
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
247 *(long*)addr = PyLong_AsLong(v);
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
248 if ((*(long*)addr == -1) && PyErr_Occurred())
20012
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diff changeset
249 return -1;
40176
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
250 break;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
251 }
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
252 case T_ULONG:{
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diff changeset
253 *(unsigned long*)addr = PyLong_AsUnsignedLong(v);
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diff changeset
254 if ((*(unsigned long*)addr == (unsigned long)-1)
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
255 && PyErr_Occurred()) {
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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parents: 38024
diff changeset
256 /* XXX: For compatibility, accept negative int values
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
parents: 38024
diff changeset
257 as well. */
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diff changeset
258 PyErr_Clear();
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
259 *(unsigned long*)addr = PyLong_AsLong(v);
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
260 if ((*(unsigned long*)addr == (unsigned int)-1) && PyErr_Occurred())
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
261 return -1;
0c1cb92dac97 Patch #1549049: Rewrite type conversion in structmember.
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diff changeset
262 PyErr_Warn(PyExc_RuntimeWarning, "Writing negative value into unsigned field");
20012
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Guido van Rossum <guido@python.org>
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diff changeset
263 }
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
Guido van Rossum <guido@python.org>
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264 break;
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265 }
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266 case T_FLOAT:{
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267 double double_val;
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268 double_val = PyFloat_AsDouble(v);
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269 if ((double_val == -1) && PyErr_Occurred())
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270 return -1;
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271 *(float*)addr = (float)double_val;
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272 break;
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273 }
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274 case T_DOUBLE:
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275 *(double*)addr = PyFloat_AsDouble(v);
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276 if ((*(double*)addr == -1) && PyErr_Occurred())
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277 return -1;
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278 break;
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279 case T_OBJECT:
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ef6f692c76e2 Fix SF bug #486144: Uninitialized __slot__ vrbl is None.
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280 case T_OBJECT_EX:
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281 Py_XINCREF(v);
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282 oldv = *(PyObject **)addr;
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283 *(PyObject **)addr = v;
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284 Py_XDECREF(oldv);
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285 break;
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286 case T_CHAR:
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287 if (PyString_Check(v) && PyString_Size(v) == 1) {
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288 *(char*)addr = PyString_AsString(v)[0];
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289 }
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290 else {
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291 PyErr_BadArgument();
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292 return -1;
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293 }
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294 break;
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e9ffad6d8822 Patch #1115086: support PY_LONGLONG in structmember.
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295 #ifdef HAVE_LONG_LONG
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296 case T_LONGLONG:
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297 if (!PyLong_Check(v)) {
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298 PyErr_BadArgument();
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299 return -1;
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300 } else {
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301 PY_LONG_LONG value;
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302 *(PY_LONG_LONG*)addr = value = PyLong_AsLongLong(v);
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303 if ((value == -1) && PyErr_Occurred()) {
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304 return -1;
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305 }
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306 }
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diff changeset
307 break;
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308 case T_ULONGLONG:
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309 if (!PyLong_Check(v)) {
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310 PyErr_BadArgument();
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311 return -1;
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diff changeset
312 } else {
38024
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diff changeset
313 unsigned PY_LONG_LONG value;
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diff changeset
314 *(unsigned PY_LONG_LONG*)addr = value = PyLong_AsUnsignedLongLong(v);
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diff changeset
315 if ((value == (unsigned PY_LONG_LONG)-1) &&
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diff changeset
316 PyErr_Occurred()) {
34677
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diff changeset
317 return -1;
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diff changeset
318 }
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diff changeset
319 }
e9ffad6d8822 Patch #1115086: support PY_LONGLONG in structmember.
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diff changeset
320 break;
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diff changeset
321 #endif /* HAVE_LONG_LONG */
20012
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322 default:
20456
bff6c2d76f33 Put descr name in "bad memberdescr type" error message.
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parents: 20012
diff changeset
323 PyErr_Format(PyExc_SystemError,
bff6c2d76f33 Put descr name in "bad memberdescr type" error message.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 20012
diff changeset
324 "bad memberdescr type for %s", l->name);
20012
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diff changeset
325 return -1;
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diff changeset
326 }
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
327 return 0;
3faabf54b8b8 Add optional docstrings to member descriptors. For backwards
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diff changeset
328 }