Mercurial > cpython-lru_cache-weakref

annotate Modules/xreadlinesmodule.c @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 91dd223829c6
children ed1ba37a46b7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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2
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3 static char xreadlines_doc [] =
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4 "xreadlines(f)\n\
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5 \n\
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6 Return an xreadlines object for the file f.";
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7
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8 typedef struct {
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9 PyObject_HEAD
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10 PyObject *file;
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11 PyObject *lines;
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12 int lineslen;
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13 int lineno;
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14 int abslineno;
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15 } PyXReadlinesObject;
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16
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17 staticforward PyTypeObject XReadlinesObject_Type;
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18
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19 static void
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20 xreadlines_dealloc(PyXReadlinesObject *op)
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21 {
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22 Py_XDECREF(op->file);
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23 Py_XDECREF(op->lines);
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24 PyObject_DEL(op);
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25 }
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26
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27 /* A larger chunk size doesn't seem to make a difference */
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28 #define CHUNKSIZE 8192
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29
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30 static PyXReadlinesObject *
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31 newreadlinesobject(PyObject *file)
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32 {
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33 PyXReadlinesObject *op;
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34 op = PyObject_NEW(PyXReadlinesObject, &XReadlinesObject_Type);
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35 if (op == NULL)
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36 return NULL;
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37 Py_XINCREF(file);
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38 op->file = file;
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39 op->lines = NULL;
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40 op->abslineno = op->lineno = op->lineslen = 0;
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41 return op;
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42 }
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43
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44 static PyObject *
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45 xreadlines(PyObject *self, PyObject *args)
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46 {
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47 PyObject *file;
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48 PyXReadlinesObject *ret;
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49
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50 if (!PyArg_ParseTuple(args, "O:xreadlines", &file))
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51 return NULL;
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52 ret = newreadlinesobject(file);
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53 return (PyObject*)ret;
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54 }
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55
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56 static PyObject *
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57 xreadlines_common(PyXReadlinesObject *a)
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58 {
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59 if (a->lineno >= a->lineslen) {
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60 Py_XDECREF(a->lines);
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61 a->lines = PyObject_CallMethod(a->file, "readlines", "(i)",
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62 CHUNKSIZE);
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63 if (a->lines == NULL)
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64 return NULL;
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65 a->lineno = 0;
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66 if ((a->lineslen = PySequence_Size(a->lines)) < 0)
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67 return NULL;
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68 }
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69 a->abslineno++;
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70 return PySequence_GetItem(a->lines, a->lineno++);
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71 }
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72
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73 static PyObject *
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74 xreadlines_item(PyXReadlinesObject *a, int i)
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75 {
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76 if (i != a->abslineno) {
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77 PyErr_SetString(PyExc_RuntimeError,
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78 "xreadlines object accessed out of order");
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79 return NULL;
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80 }
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81 return xreadlines_common(a);
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82 }
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83
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84 static PyObject *
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85 xreadlines_getiter(PyXReadlinesObject *a)
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86 {
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87 Py_INCREF(a);
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88 return (PyObject *)a;
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89 }
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90
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91 static PyObject *
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92 xreadlines_iternext(PyXReadlinesObject *a)
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93 {
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94 PyObject *res;
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95
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96 res = xreadlines_common(a);
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97 if (res == NULL && PyErr_ExceptionMatches(PyExc_IndexError))
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98 PyErr_Clear();
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99 return res;
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100 }
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101
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102 static PyObject *
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103 xreadlines_next(PyXReadlinesObject *a, PyObject *args)
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104 {
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105 PyObject *res;
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106
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107 if (!PyArg_ParseTuple(args, ""))
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108 return NULL;
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109 res = xreadlines_common(a);
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110 if (res == NULL && PyErr_ExceptionMatches(PyExc_IndexError))
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111 PyErr_SetObject(PyExc_StopIteration, Py_None);
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112 return res;
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113 }
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114
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115 static char next_doc[] = "x.next() -> the next line or raise StopIteration";
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116
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117 static PyMethodDef xreadlines_methods[] = {
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118 {"next", (PyCFunction)xreadlines_next, METH_VARARGS, next_doc},
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119 {NULL, NULL}
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120 };
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121
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122 static PyObject *
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123 xreadlines_getattr(PyObject *a, char *name)
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124 {
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125 return Py_FindMethod(xreadlines_methods, a, name);
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126 }
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127
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128 static PySequenceMethods xreadlines_as_sequence = {
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129 0, /*sq_length*/
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130 0, /*sq_concat*/
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131 0, /*sq_repeat*/
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132 (intargfunc)xreadlines_item, /*sq_item*/
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133 };
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134
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135 static PyTypeObject XReadlinesObject_Type = {
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136 PyObject_HEAD_INIT(NULL)
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137 0,
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138 "xreadlines.xreadlines",
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139 sizeof(PyXReadlinesObject),
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140 0,
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141 (destructor)xreadlines_dealloc, /* tp_dealloc */
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142 0, /* tp_print */
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143 xreadlines_getattr, /* tp_getattr */
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144 0, /* tp_setattr */
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145 0, /* tp_compare */
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146 0, /* tp_repr */
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147 0, /* tp_as_number */
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148 &xreadlines_as_sequence, /* tp_as_sequence */
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149 0, /* tp_as_mapping */
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150 0, /* tp_hash */
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151 0, /* tp_call */
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152 0, /* tp_str */
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153 0, /* tp_getattro */
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154 0, /* tp_setattro */
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155 0, /* tp_as_buffer */
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156 Py_TPFLAGS_DEFAULT, /* tp_flags */
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157 0, /* tp_doc */
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158 0, /* tp_traverse */
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159 0, /* tp_clear */
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160 0, /* tp_richcompare */
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161 0, /* tp_weaklistoffset */
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162 (getiterfunc)xreadlines_getiter, /* tp_iter */
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163 (iternextfunc)xreadlines_iternext, /* tp_iternext */
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164 };
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165
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166 static PyMethodDef xreadlines_functions[] = {
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167 {"xreadlines", xreadlines, METH_VARARGS, xreadlines_doc},
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168 {NULL, NULL}
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169 };
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170
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171 DL_EXPORT(void)
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172 initxreadlines(void)
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173 {
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174 XReadlinesObject_Type.ob_type = &PyType_Type;
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175 Py_InitModule("xreadlines", xreadlines_functions);
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176 }