Mercurial > cpython-lru_cache-weakref

annotate Python/traceback.c @ 81257:c256764e2b3f 3.2

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Issue #16455: On FreeBSD and Solaris, if the locale is C, the ASCII/surrogateescape codec is now used, instead of the locale encoding, to decode the command line arguments. This change fixes inconsistencies with os.fsencode() and os.fsdecode() because these operating systems announces an ASCII locale encoding, whereas the ISO-8859-1 encoding is used in practice.
author Victor Stinner <victor.stinner@gmail.com>
date Thu, 03 Jan 2013 01:08:58 +0100
parents 3c9232a684ae
children b0680b5a5215
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Traceback implementation */
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3
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4 #include "Python.h"
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5
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6 #include "code.h"
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7 #include "frameobject.h"
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8 #include "structmember.h"
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9 #include "osdefs.h"
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10 #ifdef HAVE_FCNTL_H
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11 #include <fcntl.h>
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12 #endif
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13
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14 #define OFF(x) offsetof(PyTracebackObject, x)
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15
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16 /* Method from Parser/tokenizer.c */
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17 extern char * PyTokenizer_FindEncoding(int);
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18
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19 static PyObject *
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20 tb_dir(PyTracebackObject *self)
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21 {
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22 return Py_BuildValue("[ssss]", "tb_frame", "tb_next",
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23 "tb_lasti", "tb_lineno");
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24 }
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25
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26 static PyMethodDef tb_methods[] = {
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27 {"__dir__", (PyCFunction)tb_dir, METH_NOARGS},
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28 {NULL, NULL, 0, NULL},
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29 };
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30
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31 static PyMemberDef tb_memberlist[] = {
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32 {"tb_next", T_OBJECT, OFF(tb_next), READONLY},
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33 {"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
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34 {"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
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35 {"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
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36 {NULL} /* Sentinel */
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37 };
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39 static void
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40 tb_dealloc(PyTracebackObject *tb)
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41 {
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42 PyObject_GC_UnTrack(tb);
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43 Py_TRASHCAN_SAFE_BEGIN(tb)
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44 Py_XDECREF(tb->tb_next);
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45 Py_XDECREF(tb->tb_frame);
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46 PyObject_GC_Del(tb);
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47 Py_TRASHCAN_SAFE_END(tb)
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48 }
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49
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50 static int
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51 tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
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52 {
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53 Py_VISIT(tb->tb_next);
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54 Py_VISIT(tb->tb_frame);
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55 return 0;
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56 }
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57
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58 static void
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59 tb_clear(PyTracebackObject *tb)
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60 {
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61 Py_CLEAR(tb->tb_next);
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62 Py_CLEAR(tb->tb_frame);
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63 }
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64
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65 PyTypeObject PyTraceBack_Type = {
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66 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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67 "traceback",
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68 sizeof(PyTracebackObject),
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69 0,
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70 (destructor)tb_dealloc, /*tp_dealloc*/
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71 0, /*tp_print*/
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72 0, /*tp_getattr*/
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73 0, /*tp_setattr*/
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74 0, /*tp_reserved*/
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75 0, /*tp_repr*/
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76 0, /*tp_as_number*/
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77 0, /*tp_as_sequence*/
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78 0, /*tp_as_mapping*/
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79 0, /* tp_hash */
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80 0, /* tp_call */
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81 0, /* tp_str */
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82 PyObject_GenericGetAttr, /* tp_getattro */
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83 0, /* tp_setattro */
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84 0, /* tp_as_buffer */
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85 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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86 0, /* tp_doc */
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87 (traverseproc)tb_traverse, /* tp_traverse */
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88 (inquiry)tb_clear, /* tp_clear */
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89 0, /* tp_richcompare */
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90 0, /* tp_weaklistoffset */
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91 0, /* tp_iter */
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92 0, /* tp_iternext */
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93 tb_methods, /* tp_methods */
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94 tb_memberlist, /* tp_members */
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95 0, /* tp_getset */
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96 0, /* tp_base */
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97 0, /* tp_dict */
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98 };
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99
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100 static PyTracebackObject *
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101 newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
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102 {
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103 PyTracebackObject *tb;
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104 if ((next != NULL && !PyTraceBack_Check(next)) ||
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105 frame == NULL || !PyFrame_Check(frame)) {
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106 PyErr_BadInternalCall();
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107 return NULL;
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108 }
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109 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
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110 if (tb != NULL) {
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111 Py_XINCREF(next);
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112 tb->tb_next = next;
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113 Py_XINCREF(frame);
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114 tb->tb_frame = frame;
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115 tb->tb_lasti = frame->f_lasti;
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116 tb->tb_lineno = PyFrame_GetLineNumber(frame);
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117 PyObject_GC_Track(tb);
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118 }
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119 return tb;
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120 }
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121
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122 int
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123 PyTraceBack_Here(PyFrameObject *frame)
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124 {
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125 PyThreadState *tstate = PyThreadState_GET();
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126 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
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127 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
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128 if (tb == NULL)
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129 return -1;
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130 tstate->curexc_traceback = (PyObject *)tb;
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131 Py_XDECREF(oldtb);
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132 return 0;
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133 }
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134
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135 static PyObject *
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136 _Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *io)
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137 {
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138 Py_ssize_t i;
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139 PyObject *binary;
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140 PyObject *v;
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141 Py_ssize_t npath;
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142 size_t taillen;
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143 PyObject *syspath;
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144 PyObject *path;
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145 const char* tail;
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146 PyObject *filebytes;
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147 const char* filepath;
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148 Py_ssize_t len;
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149 PyObject* result;
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150
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151 filebytes = PyUnicode_EncodeFSDefault(filename);
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152 if (filebytes == NULL) {
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153 PyErr_Clear();
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154 return NULL;
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155 }
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156 filepath = PyBytes_AS_STRING(filebytes);
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157
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158 /* Search tail of filename in sys.path before giving up */
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159 tail = strrchr(filepath, SEP);
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160 if (tail == NULL)
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161 tail = filepath;
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162 else
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163 tail++;
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164 taillen = strlen(tail);
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165
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166 syspath = PySys_GetObject("path");
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167 if (syspath == NULL || !PyList_Check(syspath))
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168 goto error;
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169 npath = PyList_Size(syspath);
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170
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171 for (i = 0; i < npath; i++) {
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172 v = PyList_GetItem(syspath, i);
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173 if (v == NULL) {
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174 PyErr_Clear();
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175 break;
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176 }
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177 if (!PyUnicode_Check(v))
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178 continue;
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179 path = PyUnicode_EncodeFSDefault(v);
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180 if (path == NULL) {
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181 PyErr_Clear();
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182 continue;
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183 }
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184 len = PyBytes_GET_SIZE(path);
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185 if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1) {
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186 Py_DECREF(path);
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187 continue; /* Too long */
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188 }
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189 strcpy(namebuf, PyBytes_AS_STRING(path));
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190 Py_DECREF(path);
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191 if (strlen(namebuf) != len)
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192 continue; /* v contains '\0' */
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193 if (len > 0 && namebuf[len-1] != SEP)
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194 namebuf[len++] = SEP;
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195 strcpy(namebuf+len, tail);
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196
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197 binary = PyObject_CallMethod(io, "open", "ss", namebuf, "rb");
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198 if (binary != NULL) {
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199 result = binary;
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200 goto finally;
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201 }
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202 PyErr_Clear();
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203 }
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204 goto error;
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205
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206 error:
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207 result = NULL;
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208 finally:
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209 Py_DECREF(filebytes);
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210 return result;
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211 }
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212
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213 int
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214 _Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
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215 {
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216 int err = 0;
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217 int fd;
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218 int i;
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219 char *found_encoding;
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220 char *encoding;
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221 PyObject *io;
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222 PyObject *binary;
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223 PyObject *fob = NULL;
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224 PyObject *lineobj = NULL;
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225 PyObject *res;
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226 char buf[MAXPATHLEN+1];
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227 Py_UNICODE *u, *p;
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228 Py_ssize_t len;
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229
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230 /* open the file */
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231 if (filename == NULL)
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232 return 0;
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233
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234 io = PyImport_ImportModuleNoBlock("io");
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235 if (io == NULL)
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236 return -1;
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237 binary = PyObject_CallMethod(io, "open", "Os", filename, "rb");
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238
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239 if (binary == NULL) {
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240 binary = _Py_FindSourceFile(filename, buf, sizeof(buf), io);
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241 if (binary == NULL) {
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242 Py_DECREF(io);
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243 return 0;
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244 }
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245 }
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246
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247 /* use the right encoding to decode the file as unicode */
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248 fd = PyObject_AsFileDescriptor(binary);
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249 found_encoding = PyTokenizer_FindEncoding(fd);
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250 encoding = (found_encoding != NULL) ? found_encoding : "utf-8";
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251 lseek(fd, 0, 0); /* Reset position */
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252 fob = PyObject_CallMethod(io, "TextIOWrapper", "Os", binary, encoding);
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253 Py_DECREF(io);
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254 Py_DECREF(binary);
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255 PyMem_FREE(found_encoding);
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256
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257 if (fob == NULL) {
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258 PyErr_Clear();
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259 return 0;
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260 }
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261
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262 /* get the line number lineno */
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263 for (i = 0; i < lineno; i++) {
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264 Py_XDECREF(lineobj);
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265 lineobj = PyFile_GetLine(fob, -1);
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266 if (!lineobj) {
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267 err = -1;
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268 break;
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269 }
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270 }
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271 res = PyObject_CallMethod(fob, "close", "");
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272 if (res)
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273 Py_DECREF(res);
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274 else
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275 PyErr_Clear();
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276 Py_DECREF(fob);
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277 if (!lineobj || !PyUnicode_Check(lineobj)) {
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278 Py_XDECREF(lineobj);
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279 return err;
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280 }
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281
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282 /* remove the indentation of the line */
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283 u = PyUnicode_AS_UNICODE(lineobj);
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284 len = PyUnicode_GET_SIZE(lineobj);
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285 for (p=u; *p == ' ' || *p == '\t' || *p == '\014'; p++)
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286 len--;
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287 if (u != p) {
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288 PyObject *truncated;
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289 truncated = PyUnicode_FromUnicode(p, len);
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290 if (truncated) {
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291 Py_DECREF(lineobj);
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292 lineobj = truncated;
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293 } else {
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294 PyErr_Clear();
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295 }
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296 }
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297
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298 /* Write some spaces before the line */
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299 strcpy(buf, " ");
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300 assert (strlen(buf) == 10);
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301 while (indent > 0) {
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302 if(indent < 10)
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303 buf[indent] = '\0';
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304 err = PyFile_WriteString(buf, f);
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305 if (err != 0)
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306 break;
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307 indent -= 10;
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308 }
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309
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310 /* finally display the line */
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311 if (err == 0)
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312 err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);
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313 Py_DECREF(lineobj);
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314 if (err == 0)
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315 err = PyFile_WriteString("\n", f);
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316 return err;
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317 }
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318
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319 static int
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320 tb_displayline(PyObject *f, PyObject *filename, int lineno, PyObject *name)
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321 {
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322 int err;
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323 PyObject *line;
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324
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325 if (filename == NULL || name == NULL)
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326 return -1;
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327 line = PyUnicode_FromFormat(" File \"%U\", line %d, in %U\n",
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328 filename, lineno, name);
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329 if (line == NULL)
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330 return -1;
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331 err = PyFile_WriteObject(line, f, Py_PRINT_RAW);
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332 Py_DECREF(line);
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333 if (err != 0)
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334 return err;
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335 return _Py_DisplaySourceLine(f, filename, lineno, 4);
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336 }
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337
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338 static int
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339 tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
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340 {
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341 int err = 0;
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342 long depth = 0;
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343 PyTracebackObject *tb1 = tb;
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344 while (tb1 != NULL) {
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345 depth++;
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346 tb1 = tb1->tb_next;
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347 }
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348 while (tb != NULL && err == 0) {
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349 if (depth <= limit) {
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350 err = tb_displayline(f,
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351 tb->tb_frame->f_code->co_filename,
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352 tb->tb_lineno,
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353 tb->tb_frame->f_code->co_name);
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354 }
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355 depth--;
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356 tb = tb->tb_next;
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357 if (err == 0)
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358 err = PyErr_CheckSignals();
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359 }
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360 return err;
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361 }
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362
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363 #define PyTraceBack_LIMIT 1000
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364
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365 int
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366 PyTraceBack_Print(PyObject *v, PyObject *f)
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367 {
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368 int err;
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369 PyObject *limitv;
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370 long limit = PyTraceBack_LIMIT;
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371
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372 if (v == NULL)
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373 return 0;
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374 if (!PyTraceBack_Check(v)) {
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375 PyErr_BadInternalCall();
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376 return -1;
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377 }
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378 limitv = PySys_GetObject("tracebacklimit");
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379 if (limitv) {
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380 PyObject *exc_type, *exc_value, *exc_tb;
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381
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382 PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
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383 limit = PyLong_AsLong(limitv);
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384 if (limit == -1 && PyErr_Occurred()) {
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385 if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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386 limit = PyTraceBack_LIMIT;
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387 }
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388 else {
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389 Py_XDECREF(exc_type);
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390 Py_XDECREF(exc_value);
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391 Py_XDECREF(exc_tb);
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392 return 0;
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393 }
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394 }
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395 else if (limit <= 0) {
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396 limit = PyTraceBack_LIMIT;
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397 }
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398 PyErr_Restore(exc_type, exc_value, exc_tb);
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399 }
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400 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
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401 if (!err)
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402 err = tb_printinternal((PyTracebackObject *)v, f, limit);
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403 return err;
86
a6934380c6e7 "Compiling" version
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404 }