Mercurial > cpython-lru_cache-weakref

annotate Modules/xreadlinesmodule.c @ 16413:8819867f14ef legacy-trunk

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Patch derived from Trent's 101162: a Python/C API testing framework. STILL NEEDS UNIX BUILD CHANGES.
author Tim Peters <tim.peters@gmail.com>
date Fri, 02 Feb 2001 05:57:15 +0000
parents 4c856a180458
children f1a49eec7c2b
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 Py_XINCREF(ret);
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54 return (PyObject*)ret;
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55 }
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56
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57 static PyObject *
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58 xreadlines_item(PyXReadlinesObject *a, int i)
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59 {
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60 if (i != a->abslineno) {
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61 PyErr_SetString(PyExc_RuntimeError,
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62 "xreadlines object accessed out of order");
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63 return NULL;
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64 }
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65 if (a->lineno >= a->lineslen) {
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66 Py_XDECREF(a->lines);
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67 a->lines = PyObject_CallMethod(a->file, "readlines", "(i)",
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68 CHUNKSIZE);
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69 if (a->lines == NULL)
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70 return NULL;
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71 a->lineno = 0;
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72 if ((a->lineslen = PySequence_Size(a->lines)) < 0)
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73 return NULL;
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74 }
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75 a->abslineno++;
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76 return PySequence_GetItem(a->lines, a->lineno++);
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77 }
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78
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79 static PySequenceMethods xreadlines_as_sequence = {
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80 0, /*sq_length*/
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81 0, /*sq_concat*/
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82 0, /*sq_repeat*/
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83 (intargfunc)xreadlines_item, /*sq_item*/
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84 };
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85
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86 static PyTypeObject XReadlinesObject_Type = {
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87 PyObject_HEAD_INIT(NULL)
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88 0,
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89 "xreadlines",
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90 sizeof(PyXReadlinesObject) + PyGC_HEAD_SIZE,
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91 0,
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92 (destructor)xreadlines_dealloc, /*tp_dealloc*/
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93 0, /*tp_print*/
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94 0, /*tp_getattr*/
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95 0, /*tp_setattr*/
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96 0, /*tp_compare*/
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97 0, /*tp_repr*/
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98 0, /*tp_as_number*/
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99 &xreadlines_as_sequence, /*tp_as_sequence*/
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100 0, /*tp_as_mapping*/
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101 0, /*tp_hash*/
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102 0, /*tp_call*/
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103 0, /*tp_str*/
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104 0, /*tp_getattro*/
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105 0, /*tp_setattro*/
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106 0, /*tp_as_buffer*/
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107 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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108 0, /* tp_doc */
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109 };
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110
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111 static PyMethodDef xreadlines_methods[] = {
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112 {"xreadlines", xreadlines, METH_VARARGS, xreadlines_doc},
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113 {NULL, NULL}
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114 };
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115
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116 DL_EXPORT(void)
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117 initxreadlines(void)
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118 {
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119 PyObject *m;
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120
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121 XReadlinesObject_Type.ob_type = &PyType_Type;
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122 m = Py_InitModule("xreadlines", xreadlines_methods);
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123 }