annotate Objects/enumobject.c @ 37034:fff4eecdef45 legacy-trunk

Fix a leak that would happen under error conditions (found by Coverty).
author Thomas Heller <theller@ctypes.org>
date Thu, 16 Mar 2006 20:02:36 +0000
parents 9eb24f92a784
children aeee85b6a5dd f731859e9b3b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* enumerate object */
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2
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3 #include "Python.h"
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4
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5 typedef struct {
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6 PyObject_HEAD
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7 long en_index; /* current index of enumeration */
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8 PyObject* en_sit; /* secondary iterator of enumeration */
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9 PyObject* en_result; /* result tuple */
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10 } enumobject;
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11
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12 PyTypeObject PyEnum_Type;
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13
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14 static PyObject *
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15 enum_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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16 {
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17 enumobject *en;
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18 PyObject *seq = NULL;
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19 static char *kwlist[] = {"sequence", 0};
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20
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21 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:enumerate", kwlist,
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22 &seq))
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23 return NULL;
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24
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25 en = (enumobject *)type->tp_alloc(type, 0);
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26 if (en == NULL)
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27 return NULL;
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28 en->en_index = 0;
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29 en->en_sit = PyObject_GetIter(seq);
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30 if (en->en_sit == NULL) {
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31 Py_DECREF(en);
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32 return NULL;
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33 }
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34 en->en_result = PyTuple_Pack(2, Py_None, Py_None);
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35 if (en->en_result == NULL) {
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36 Py_DECREF(en);
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37 return NULL;
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38 }
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39 return (PyObject *)en;
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40 }
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41
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42 static void
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43 enum_dealloc(enumobject *en)
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44 {
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45 PyObject_GC_UnTrack(en);
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46 Py_XDECREF(en->en_sit);
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47 Py_XDECREF(en->en_result);
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48 en->ob_type->tp_free(en);
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49 }
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50
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51 static int
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52 enum_traverse(enumobject *en, visitproc visit, void *arg)
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53 {
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54 int err;
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55
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56 if (en->en_sit) {
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57 err = visit(en->en_sit, arg);
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58 if (err)
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59 return err;
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60 }
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61 if (en->en_result) {
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62 err = visit(en->en_result, arg);
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63 if (err)
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64 return err;
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65 }
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66 return 0;
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67 }
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68
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69 static PyObject *
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70 enum_next(enumobject *en)
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71 {
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72 PyObject *next_index;
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73 PyObject *next_item;
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74 PyObject *result = en->en_result;
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75 PyObject *it = en->en_sit;
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76
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77 next_item = (*it->ob_type->tp_iternext)(it);
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78 if (next_item == NULL)
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79 return NULL;
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80
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81 next_index = PyInt_FromLong(en->en_index);
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82 if (next_index == NULL) {
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83 Py_DECREF(next_item);
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84 return NULL;
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85 }
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86 en->en_index++;
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87
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88 if (result->ob_refcnt == 1) {
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89 Py_INCREF(result);
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90 Py_DECREF(PyTuple_GET_ITEM(result, 0));
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91 Py_DECREF(PyTuple_GET_ITEM(result, 1));
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92 } else {
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93 result = PyTuple_New(2);
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94 if (result == NULL) {
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95 Py_DECREF(next_index);
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96 Py_DECREF(next_item);
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97 return NULL;
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98 }
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99 }
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100 PyTuple_SET_ITEM(result, 0, next_index);
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101 PyTuple_SET_ITEM(result, 1, next_item);
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102 return result;
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103 }
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104
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105 PyDoc_STRVAR(enum_doc,
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106 "enumerate(iterable) -> iterator for index, value of iterable\n"
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107 "\n"
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108 "Return an enumerate object. iterable must be an other object that supports\n"
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109 "iteration. The enumerate object yields pairs containing a count (from\n"
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110 "zero) and a value yielded by the iterable argument. enumerate is useful\n"
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111 "for obtaining an indexed list: (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
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112
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113 PyTypeObject PyEnum_Type = {
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114 PyObject_HEAD_INIT(&PyType_Type)
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115 0, /* ob_size */
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116 "enumerate", /* tp_name */
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117 sizeof(enumobject), /* tp_basicsize */
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118 0, /* tp_itemsize */
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119 /* methods */
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120 (destructor)enum_dealloc, /* tp_dealloc */
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121 0, /* tp_print */
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122 0, /* tp_getattr */
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123 0, /* tp_setattr */
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124 0, /* tp_compare */
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125 0, /* tp_repr */
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126 0, /* tp_as_number */
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127 0, /* tp_as_sequence */
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128 0, /* tp_as_mapping */
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129 0, /* tp_hash */
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130 0, /* tp_call */
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131 0, /* tp_str */
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132 PyObject_GenericGetAttr, /* tp_getattro */
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133 0, /* tp_setattro */
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134 0, /* tp_as_buffer */
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135 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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136 Py_TPFLAGS_BASETYPE, /* tp_flags */
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137 enum_doc, /* tp_doc */
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138 (traverseproc)enum_traverse, /* tp_traverse */
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139 0, /* tp_clear */
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140 0, /* tp_richcompare */
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141 0, /* tp_weaklistoffset */
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142 PyObject_SelfIter, /* tp_iter */
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143 (iternextfunc)enum_next, /* tp_iternext */
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144 0, /* tp_methods */
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145 0, /* tp_members */
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146 0, /* tp_getset */
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147 0, /* tp_base */
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148 0, /* tp_dict */
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149 0, /* tp_descr_get */
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150 0, /* tp_descr_set */
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151 0, /* tp_dictoffset */
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152 0, /* tp_init */
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153 PyType_GenericAlloc, /* tp_alloc */
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154 enum_new, /* tp_new */
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155 PyObject_GC_Del, /* tp_free */
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156 };
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157
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158 /* Reversed Object ***************************************************************/
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159
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160 typedef struct {
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161 PyObject_HEAD
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162 Py_ssize_t index;
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163 PyObject* seq;
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164 } reversedobject;
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165
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166 static PyObject *
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167 reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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168 {
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169 Py_ssize_t n;
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170 PyObject *seq;
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171 reversedobject *ro;
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172
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173 if (!PyArg_UnpackTuple(args, "reversed", 1, 1, &seq))
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174 return NULL;
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175
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176 if (PyObject_HasAttrString(seq, "__reversed__"))
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177 return PyObject_CallMethod(seq, "__reversed__", NULL);
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178
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179 if (!PySequence_Check(seq)) {
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180 PyErr_SetString(PyExc_TypeError,
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181 "argument to reversed() must be a sequence");
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182 return NULL;
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183 }
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184
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185 n = PySequence_Size(seq);
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186 if (n == -1)
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187 return NULL;
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188
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189 ro = (reversedobject *)type->tp_alloc(type, 0);
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190 if (ro == NULL)
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191 return NULL;
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192
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193 ro->index = n-1;
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194 Py_INCREF(seq);
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195 ro->seq = seq;
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196 return (PyObject *)ro;
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197 }
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198
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199 static void
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200 reversed_dealloc(reversedobject *ro)
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201 {
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202 PyObject_GC_UnTrack(ro);
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203 Py_XDECREF(ro->seq);
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204 ro->ob_type->tp_free(ro);
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205 }
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206
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207 static int
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208 reversed_traverse(reversedobject *ro, visitproc visit, void *arg)
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209 {
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210 if (ro->seq)
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211 return visit((PyObject *)(ro->seq), arg);
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212 return 0;
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213 }
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214
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215 static PyObject *
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216 reversed_next(reversedobject *ro)
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217 {
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218 PyObject *item;
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219 Py_ssize_t index = ro->index;
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220
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221 if (index >= 0) {
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222 item = PySequence_GetItem(ro->seq, index);
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223 if (item != NULL) {
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224 ro->index--;
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225 return item;
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226 }
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227 if (PyErr_ExceptionMatches(PyExc_IndexError) ||
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228 PyErr_ExceptionMatches(PyExc_StopIteration))
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229 PyErr_Clear();
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230 }
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231 ro->index = -1;
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232 Py_CLEAR(ro->seq);
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233 return NULL;
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234 }
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235
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236 PyDoc_STRVAR(reversed_doc,
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237 "reversed(sequence) -> reverse iterator over values of the sequence\n"
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238 "\n"
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239 "Return a reverse iterator");
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240
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241 static PyObject *
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242 reversed_len(reversedobject *ro)
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243 {
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244 Py_ssize_t position, seqsize;
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245
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246 if (ro->seq == NULL)
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247 return PyInt_FromLong(0);
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248 seqsize = PySequence_Size(ro->seq);
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249 if (seqsize == -1)
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250 return NULL;
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251 position = ro->index + 1;
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252 return PyInt_FromSsize_t((seqsize < position) ? 0 : position);
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253 }
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254
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255 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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256
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257 static PyMethodDef reversediter_methods[] = {
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258 {"__length_hint__", (PyCFunction)reversed_len, METH_NOARGS, length_hint_doc},
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259 {NULL, NULL} /* sentinel */
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260 };
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261
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262 PyTypeObject PyReversed_Type = {
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263 PyObject_HEAD_INIT(&PyType_Type)
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264 0, /* ob_size */
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265 "reversed", /* tp_name */
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266 sizeof(reversedobject), /* tp_basicsize */
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267 0, /* tp_itemsize */
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268 /* methods */
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269 (destructor)reversed_dealloc, /* tp_dealloc */
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270 0, /* tp_print */
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271 0, /* tp_getattr */
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272 0, /* tp_setattr */
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273 0, /* tp_compare */
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274 0, /* tp_repr */
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275 0, /* tp_as_number */
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276 0, /* tp_as_sequence */
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277 0, /* tp_as_mapping */
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278 0, /* tp_hash */
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279 0, /* tp_call */
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280 0, /* tp_str */
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281 PyObject_GenericGetAttr, /* tp_getattro */
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282 0, /* tp_setattro */
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283 0, /* tp_as_buffer */
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284 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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285 Py_TPFLAGS_BASETYPE, /* tp_flags */
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286 reversed_doc, /* tp_doc */
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287 (traverseproc)reversed_traverse,/* tp_traverse */
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288 0, /* tp_clear */
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289 0, /* tp_richcompare */
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290 0, /* tp_weaklistoffset */
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291 PyObject_SelfIter, /* tp_iter */
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292 (iternextfunc)reversed_next, /* tp_iternext */
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293 reversediter_methods, /* tp_methods */
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294 0, /* tp_members */
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295 0, /* tp_getset */
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296 0, /* tp_base */
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297 0, /* tp_dict */
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298 0, /* tp_descr_get */
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299 0, /* tp_descr_set */
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300 0, /* tp_dictoffset */
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301 0, /* tp_init */
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302 PyType_GenericAlloc, /* tp_alloc */
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303 reversed_new, /* tp_new */
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304 PyObject_GC_Del, /* tp_free */
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305 };