Mercurial > cpython-lru_cache-weakref

annotate Python/structmember.c @ 16829:6732905686d4 legacy-trunk

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author Tim Peters <tim.peters@gmail.com>
date Wed, 28 Feb 2001 05:56:18 +0000
parents 7b3476c1382e
children 8522b022f80a
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 addr += l->offset;
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42 switch (l->type) {
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43 case T_BYTE:
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44 v = PyInt_FromLong((long)
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45 (((*(char*)addr & 0xff)
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46 ^ 0x80) - 0x80));
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47 break;
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48 case T_UBYTE:
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49 v = PyInt_FromLong((long) *(char*)addr & 0xff);
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50 break;
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51 case T_SHORT:
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52 v = PyInt_FromLong((long) *(short*)addr);
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53 break;
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54 case T_USHORT:
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55 v = PyInt_FromLong((long)
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56 *(unsigned short*)addr);
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57 break;
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58 case T_INT:
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59 v = PyInt_FromLong((long) *(int*)addr);
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60 break;
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61 case T_UINT:
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62 v = PyInt_FromLong((long)
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63 *(unsigned int*)addr);
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64 break;
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65 case T_LONG:
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66 v = PyInt_FromLong(*(long*)addr);
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67 break;
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68 case T_ULONG:
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69 v = PyLong_FromDouble((double)
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70 *(unsigned long*)addr);
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71 break;
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72 case T_FLOAT:
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73 v = PyFloat_FromDouble((double)*(float*)addr);
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74 break;
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75 case T_DOUBLE:
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76 v = PyFloat_FromDouble(*(double*)addr);
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77 break;
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78 case T_STRING:
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79 if (*(char**)addr == NULL) {
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80 Py_INCREF(Py_None);
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81 v = Py_None;
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82 }
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83 else
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84 v = PyString_FromString(*(char**)addr);
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85 break;
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86 case T_STRING_INPLACE:
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87 v = PyString_FromString((char*)addr);
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88 break;
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89 #ifdef macintosh
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90 case T_PSTRING:
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91 if (*(char**)addr == NULL) {
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92 Py_INCREF(Py_None);
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93 v = Py_None;
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94 }
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95 else
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96 v = PyString_FromStringAndSize(
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97 (*(char**)addr)+1,
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98 **(unsigned char**)addr);
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99 break;
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100 case T_PSTRING_INPLACE:
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101 v = PyString_FromStringAndSize(
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102 ((char*)addr)+1,
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103 *(unsigned char*)addr);
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104 break;
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105 #endif /* macintosh */
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106 case T_CHAR:
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107 v = PyString_FromStringAndSize((char*)addr, 1);
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108 break;
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109 case T_OBJECT:
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110 v = *(PyObject **)addr;
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111 if (v == NULL)
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112 v = Py_None;
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113 Py_INCREF(v);
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114 break;
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115 default:
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116 PyErr_SetString(PyExc_SystemError,
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117 "bad memberlist type");
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118 v = NULL;
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119 }
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120 return v;
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121 }
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122 }
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123
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124 PyErr_SetString(PyExc_AttributeError, name);
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125 return NULL;
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126 }
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127
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128 int
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129 PyMember_Set(char *addr, struct memberlist *mlist, char *name, PyObject *v)
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130 {
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131 struct memberlist *l;
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132 PyObject *oldv;
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133
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134 for (l = mlist; l->name != NULL; l++) {
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135 if (strcmp(l->name, name) == 0) {
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136 #ifdef macintosh
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137 if (l->readonly || l->type == T_STRING ||
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138 l->type == T_PSTRING)
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139 {
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140 #else
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141 if (l->readonly || l->type == T_STRING ) {
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142 #endif /* macintosh */
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143 PyErr_SetString(PyExc_TypeError,
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144 "readonly attribute");
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145 return -1;
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146 }
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147 if (v == NULL && l->type != T_OBJECT) {
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148 PyErr_SetString(PyExc_TypeError,
1848
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149 "can't delete numeric/char attribute");
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150 return -1;
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151 }
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152 addr += l->offset;
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153 switch (l->type) {
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154 case T_BYTE:
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155 case T_UBYTE:
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156 if (!PyInt_Check(v)) {
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157 PyErr_BadArgument();
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158 return -1;
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159 }
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160 *(char*)addr = (char) PyInt_AsLong(v);
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161 break;
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162 case T_SHORT:
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163 case T_USHORT:
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164 if (!PyInt_Check(v)) {
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165 PyErr_BadArgument();
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166 return -1;
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167 }
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168 *(short*)addr = (short) PyInt_AsLong(v);
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169 break;
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170 case T_UINT:
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171 case T_INT:
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172 if (!PyInt_Check(v)) {
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173 PyErr_BadArgument();
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174 return -1;
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175 }
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176 *(int*)addr = (int) PyInt_AsLong(v);
86
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177 break;
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178 case T_LONG:
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179 if (!PyInt_Check(v)) {
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180 PyErr_BadArgument();
86
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181 return -1;
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182 }
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183 *(long*)addr = PyInt_AsLong(v);
86
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184 break;
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185 case T_ULONG:
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186 if (PyInt_Check(v))
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187 *(long*)addr = PyInt_AsLong(v);
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188 else if (PyLong_Check(v))
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189 *(long*)addr = PyLong_AsLong(v);
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190 else {
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191 PyErr_BadArgument();
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192 return -1;
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diff changeset
193 }
dd7dfad404cd Added new types to setattr() as well...
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194 break;
86
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195 case T_FLOAT:
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196 if (PyInt_Check(v))
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Guido van Rossum <guido@python.org>
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diff changeset
197 *(float*)addr =
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198 (float) PyInt_AsLong(v);
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199 else if (PyFloat_Check(v))
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200 *(float*)addr =
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201 (float) PyFloat_AsDouble(v);
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202 else {
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203 PyErr_BadArgument();
86
a6934380c6e7 "Compiling" version
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204 return -1;
a6934380c6e7 "Compiling" version
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parents:
diff changeset
205 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
206 break;
a6934380c6e7 "Compiling" version
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parents:
diff changeset
207 case T_DOUBLE:
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208 if (PyInt_Check(v))
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Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
209 *(double*)addr =
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diff changeset
210 (double) PyInt_AsLong(v);
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diff changeset
211 else if (PyFloat_Check(v))
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212 *(double*)addr = PyFloat_AsDouble(v);
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diff changeset
213 else {
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diff changeset
214 PyErr_BadArgument();
86
a6934380c6e7 "Compiling" version
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diff changeset
215 return -1;
a6934380c6e7 "Compiling" version
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parents:
diff changeset
216 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
217 break;
a6934380c6e7 "Compiling" version
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diff changeset
218 case T_OBJECT:
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diff changeset
219 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
220 oldv = *(PyObject **)addr;
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diff changeset
221 *(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
222 Py_XDECREF(oldv);
86
a6934380c6e7 "Compiling" version
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diff changeset
223 break;
888
dd7dfad404cd Added new types to setattr() as well...
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diff changeset
224 case T_CHAR:
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diff changeset
225 if (PyString_Check(v) &&
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diff changeset
226 PyString_Size(v) == 1) {
888
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diff changeset
227 *(char*)addr =
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diff changeset
228 PyString_AsString(v)[0];
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diff changeset
229 }
dd7dfad404cd Added new types to setattr() as well...
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parents: 795
diff changeset
230 else {
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diff changeset
231 PyErr_BadArgument();
888
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diff changeset
232 return -1;
dd7dfad404cd Added new types to setattr() as well...
Guido van Rossum <guido@python.org>
parents: 795
diff changeset
233 }
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
234 break;
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
235 default:
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diff changeset
236 PyErr_SetString(PyExc_SystemError,
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diff changeset
237 "bad memberlist type");
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
238 return -1;
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
239 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
240 return 0;
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
241 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
242 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
243
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diff changeset
244 PyErr_SetString(PyExc_AttributeError, name);
95
a5bf7d5959ce Return -1 for errors.
Guido van Rossum <guido@python.org>
parents: 86
diff changeset
245 return -1;
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 }