Mercurial > cpython-lru_cache-weakref

annotate Python/structmember.c @ 19942:8522b022f80a legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add support for restricting access based on restricted execution mode. Renamed the 'readonly' field to 'flags' and defined some new flag bits: READ_RESTRICTED and WRITE_RESTRICTED, as well as a shortcut RESTRICTED that means both.
author Guido van Rossum <guido@python.org>
date Mon, 17 Sep 2001 19:28:08 +0000
parents 7b3476c1382e
children 3faabf54b8b8
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(char *addr, struct memberlist *mlist, 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 PyObject *v;
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41 if ((l->flags & READ_RESTRICTED) &&
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42 PyEval_GetRestricted()) {
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43 PyErr_SetString(PyExc_RuntimeError,
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44 "restricted attribute");
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45 return NULL;
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46 }
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47 addr += l->offset;
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48 switch (l->type) {
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49 case T_BYTE:
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50 v = PyInt_FromLong((long)
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51 (((*(char*)addr & 0xff)
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52 ^ 0x80) - 0x80));
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53 break;
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54 case T_UBYTE:
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55 v = PyInt_FromLong((long) *(char*)addr & 0xff);
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56 break;
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57 case T_SHORT:
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58 v = PyInt_FromLong((long) *(short*)addr);
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59 break;
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60 case T_USHORT:
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61 v = PyInt_FromLong((long)
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62 *(unsigned short*)addr);
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63 break;
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64 case T_INT:
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65 v = PyInt_FromLong((long) *(int*)addr);
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66 break;
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67 case T_UINT:
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68 v = PyInt_FromLong((long)
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69 *(unsigned int*)addr);
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70 break;
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71 case T_LONG:
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72 v = PyInt_FromLong(*(long*)addr);
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73 break;
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74 case T_ULONG:
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75 v = PyLong_FromDouble((double)
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76 *(unsigned long*)addr);
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77 break;
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78 case T_FLOAT:
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79 v = PyFloat_FromDouble((double)*(float*)addr);
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80 break;
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81 case T_DOUBLE:
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82 v = PyFloat_FromDouble(*(double*)addr);
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83 break;
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84 case T_STRING:
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85 if (*(char**)addr == NULL) {
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86 Py_INCREF(Py_None);
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87 v = Py_None;
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88 }
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89 else
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90 v = PyString_FromString(*(char**)addr);
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91 break;
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92 case T_STRING_INPLACE:
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93 v = PyString_FromString((char*)addr);
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94 break;
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95 #ifdef macintosh
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96 case T_PSTRING:
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97 if (*(char**)addr == NULL) {
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98 Py_INCREF(Py_None);
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99 v = Py_None;
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100 }
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101 else
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102 v = PyString_FromStringAndSize(
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103 (*(char**)addr)+1,
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104 **(unsigned char**)addr);
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105 break;
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106 case T_PSTRING_INPLACE:
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107 v = PyString_FromStringAndSize(
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108 ((char*)addr)+1,
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109 *(unsigned char*)addr);
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110 break;
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111 #endif /* macintosh */
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112 case T_CHAR:
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113 v = PyString_FromStringAndSize((char*)addr, 1);
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114 break;
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115 case T_OBJECT:
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116 v = *(PyObject **)addr;
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117 if (v == NULL)
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118 v = Py_None;
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119 Py_INCREF(v);
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120 break;
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121 default:
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122 PyErr_SetString(PyExc_SystemError,
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123 "bad memberlist type");
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124 v = NULL;
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125 }
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126 return v;
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127 }
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128 }
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129
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130 PyErr_SetString(PyExc_AttributeError, name);
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131 return NULL;
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132 }
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133
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134 int
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135 PyMember_Set(char *addr, struct memberlist *mlist, char *name, PyObject *v)
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136 {
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137 struct memberlist *l;
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138 PyObject *oldv;
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139
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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 if ((l->flags & READONLY) || l->type == T_STRING
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143 #ifdef macintosh
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144 || l->type == T_PSTRING
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145 #endif
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146 )
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147 {
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148 PyErr_SetString(PyExc_TypeError,
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149 "readonly attribute");
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150 return -1;
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151 }
19942
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152 if ((l->flags & WRITE_RESTRICTED) &&
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153 PyEval_GetRestricted()) {
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154 PyErr_SetString(PyExc_RuntimeError,
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155 "restricted attribute");
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156 return -1;
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157 }
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158 if (v == NULL && l->type != T_OBJECT) {
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159 PyErr_SetString(PyExc_TypeError,
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160 "can't delete numeric/char attribute");
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161 return -1;
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162 }
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163 addr += l->offset;
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164 switch (l->type) {
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165 case T_BYTE:
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166 case T_UBYTE:
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167 if (!PyInt_Check(v)) {
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168 PyErr_BadArgument();
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169 return -1;
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170 }
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171 *(char*)addr = (char) PyInt_AsLong(v);
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172 break;
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173 case T_SHORT:
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174 case T_USHORT:
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175 if (!PyInt_Check(v)) {
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176 PyErr_BadArgument();
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177 return -1;
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178 }
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179 *(short*)addr = (short) PyInt_AsLong(v);
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180 break;
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181 case T_UINT:
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182 case T_INT:
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183 if (!PyInt_Check(v)) {
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184 PyErr_BadArgument();
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185 return -1;
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186 }
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187 *(int*)addr = (int) PyInt_AsLong(v);
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188 break;
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189 case T_LONG:
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190 if (!PyInt_Check(v)) {
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191 PyErr_BadArgument();
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192 return -1;
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193 }
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194 *(long*)addr = PyInt_AsLong(v);
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195 break;
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196 case T_ULONG:
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197 if (PyInt_Check(v))
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198 *(long*)addr = PyInt_AsLong(v);
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199 else if (PyLong_Check(v))
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200 *(long*)addr = PyLong_AsLong(v);
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201 else {
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202 PyErr_BadArgument();
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203 return -1;
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204 }
dd7dfad404cd Added new types to setattr() as well...
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205 break;
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206 case T_FLOAT:
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207 if (PyInt_Check(v))
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diff changeset
208 *(float*)addr =
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209 (float) PyInt_AsLong(v);
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210 else if (PyFloat_Check(v))
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211 *(float*)addr =
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212 (float) PyFloat_AsDouble(v);
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213 else {
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214 PyErr_BadArgument();
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215 return -1;
a6934380c6e7 "Compiling" version
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216 }
a6934380c6e7 "Compiling" version
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217 break;
a6934380c6e7 "Compiling" version
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218 case T_DOUBLE:
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219 if (PyInt_Check(v))
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diff changeset
220 *(double*)addr =
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221 (double) PyInt_AsLong(v);
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222 else if (PyFloat_Check(v))
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223 *(double*)addr = PyFloat_AsDouble(v);
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224 else {
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225 PyErr_BadArgument();
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226 return -1;
a6934380c6e7 "Compiling" version
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diff changeset
227 }
a6934380c6e7 "Compiling" version
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228 break;
a6934380c6e7 "Compiling" version
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229 case T_OBJECT:
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230 Py_XINCREF(v);
8398
ff31f2501742 Trivial little change: when setting a member to an object, hold the
Guido van Rossum <guido@python.org>
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diff changeset
231 oldv = *(PyObject **)addr;
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232 *(PyObject **)addr = v;
8398
ff31f2501742 Trivial little change: when setting a member to an object, hold the
Guido van Rossum <guido@python.org>
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diff changeset
233 Py_XDECREF(oldv);
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234 break;
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235 case T_CHAR:
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236 if (PyString_Check(v) &&
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237 PyString_Size(v) == 1) {
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238 *(char*)addr =
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239 PyString_AsString(v)[0];
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240 }
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diff changeset
241 else {
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242 PyErr_BadArgument();
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243 return -1;
dd7dfad404cd Added new types to setattr() as well...
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diff changeset
244 }
16295
7b3476c1382e SF bug http://sourceforge.net/bugs/?func=detailbug&bug_id=130242&group_id=5470
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
245 break;
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246 default:
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247 PyErr_SetString(PyExc_SystemError,
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diff changeset
248 "bad memberlist type");
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249 return -1;
a6934380c6e7 "Compiling" version
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250 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
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251 return 0;
a6934380c6e7 "Compiling" version
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diff changeset
252 }
a6934380c6e7 "Compiling" version
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253 }
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254
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255 PyErr_SetString(PyExc_AttributeError, name);
95
a5bf7d5959ce Return -1 for errors.
Guido van Rossum <guido@python.org>
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diff changeset
256 return -1;
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
257 }