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annotate Python/traceback.c @ 46644:ea594306ea85

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Issue #1950: Fixed misusage of PyUnicode_AsString().
author Alexandre Vassalotti <alexandre@peadrop.com>
date Sat, 03 May 2008 18:24:43 +0000
parents 47d9bbe10897
children 031dfe455585
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 #include "traceback.h"
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12 #define OFF(x) offsetof(PyTracebackObject, x)
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13
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14 static PyObject *
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15 tb_dir(PyTracebackObject *self)
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16 {
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17 return Py_BuildValue("[ssss]", "tb_frame", "tb_next",
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18 "tb_lasti", "tb_lineno");
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19 }
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20
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21 static PyMethodDef tb_methods[] = {
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22 {"__dir__", (PyCFunction)tb_dir, METH_NOARGS},
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23 {NULL, NULL, 0, NULL},
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24 };
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25
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26 static PyMemberDef tb_memberlist[] = {
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27 {"tb_next", T_OBJECT, OFF(tb_next), READONLY},
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28 {"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
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29 {"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
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30 {"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
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31 {NULL} /* Sentinel */
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32 };
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34 static void
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35 tb_dealloc(PyTracebackObject *tb)
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36 {
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37 PyObject_GC_UnTrack(tb);
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38 Py_TRASHCAN_SAFE_BEGIN(tb)
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39 Py_XDECREF(tb->tb_next);
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40 Py_XDECREF(tb->tb_frame);
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41 PyObject_GC_Del(tb);
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42 Py_TRASHCAN_SAFE_END(tb)
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43 }
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44
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45 static int
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46 tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
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47 {
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48 Py_VISIT(tb->tb_next);
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49 Py_VISIT(tb->tb_frame);
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50 return 0;
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51 }
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52
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53 static void
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54 tb_clear(PyTracebackObject *tb)
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55 {
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56 Py_CLEAR(tb->tb_next);
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57 Py_CLEAR(tb->tb_frame);
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58 }
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59
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60 PyTypeObject PyTraceBack_Type = {
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61 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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62 "traceback",
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63 sizeof(PyTracebackObject),
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64 0,
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65 (destructor)tb_dealloc, /*tp_dealloc*/
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66 0, /*tp_print*/
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67 0, /*tp_getattr*/
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68 0, /*tp_setattr*/
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69 0, /*tp_compare*/
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70 0, /*tp_repr*/
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71 0, /*tp_as_number*/
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72 0, /*tp_as_sequence*/
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73 0, /*tp_as_mapping*/
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74 0, /* tp_hash */
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75 0, /* tp_call */
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76 0, /* tp_str */
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77 PyObject_GenericGetAttr, /* tp_getattro */
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78 0, /* tp_setattro */
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79 0, /* tp_as_buffer */
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80 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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81 0, /* tp_doc */
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82 (traverseproc)tb_traverse, /* tp_traverse */
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83 (inquiry)tb_clear, /* tp_clear */
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84 0, /* tp_richcompare */
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85 0, /* tp_weaklistoffset */
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86 0, /* tp_iter */
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87 0, /* tp_iternext */
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88 tb_methods, /* tp_methods */
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89 tb_memberlist, /* tp_members */
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90 0, /* tp_getset */
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91 0, /* tp_base */
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92 0, /* tp_dict */
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93 };
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94
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95 static PyTracebackObject *
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96 newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
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97 {
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98 PyTracebackObject *tb;
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99 if ((next != NULL && !PyTraceBack_Check(next)) ||
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100 frame == NULL || !PyFrame_Check(frame)) {
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101 PyErr_BadInternalCall();
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102 return NULL;
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103 }
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104 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
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105 if (tb != NULL) {
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106 Py_XINCREF(next);
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107 tb->tb_next = next;
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108 Py_XINCREF(frame);
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109 tb->tb_frame = frame;
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110 tb->tb_lasti = frame->f_lasti;
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111 tb->tb_lineno = PyCode_Addr2Line(frame->f_code,
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112 frame->f_lasti);
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113 PyObject_GC_Track(tb);
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114 }
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115 return tb;
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116 }
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117
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118 int
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119 PyTraceBack_Here(PyFrameObject *frame)
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120 {
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121 PyThreadState *tstate = PyThreadState_GET();
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122 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
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123 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
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124 if (tb == NULL)
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125 return -1;
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126 tstate->curexc_traceback = (PyObject *)tb;
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127 Py_XDECREF(oldtb);
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128 return 0;
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129 }
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130
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131 int
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132 Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno)
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133 {
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134 int err = 0;
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135 FILE *xfp = NULL;
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136 char linebuf[2000];
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137 int i;
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138 char namebuf[MAXPATHLEN+1];
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139
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140 if (filename == NULL)
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141 return -1;
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142 /* This is needed by Emacs' compile command */
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143 #define FMT " File \"%.500s\", line %d, in %.500s\n"
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144 xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
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145 if (xfp == NULL) {
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146 /* Search tail of filename in sys.path before giving up */
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147 PyObject *path;
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148 const char *tail = strrchr(filename, SEP);
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149 if (tail == NULL)
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150 tail = filename;
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151 else
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152 tail++;
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153 path = PySys_GetObject("path");
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154 if (path != NULL && PyList_Check(path)) {
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155 Py_ssize_t _npath = PyList_Size(path);
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156 int npath = Py_SAFE_DOWNCAST(_npath, Py_ssize_t, int);
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157 size_t taillen = strlen(tail);
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158 for (i = 0; i < npath; i++) {
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159 PyObject *v = PyList_GetItem(path, i);
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160 if (v == NULL) {
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161 PyErr_Clear();
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162 break;
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163 }
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164 if (PyString_Check(v)) {
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165 size_t len;
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166 len = PyString_GET_SIZE(v);
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167 if (len + 1 + taillen >= MAXPATHLEN)
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168 continue; /* Too long */
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169 strcpy(namebuf, PyString_AsString(v));
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170 if (strlen(namebuf) != len)
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171 continue; /* v contains '\0' */
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172 if (len > 0 && namebuf[len-1] != SEP)
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173 namebuf[len++] = SEP;
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174 strcpy(namebuf+len, tail);
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175 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
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176 if (xfp != NULL) {
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177 filename = namebuf;
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178 break;
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179 }
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180 }
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181 }
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182 }
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183 }
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184
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185 if (xfp == NULL)
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186 return err;
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187 if (err != 0) {
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188 fclose(xfp);
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189 return err;
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190 }
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191
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192 for (i = 0; i < lineno; i++) {
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193 char* pLastChar = &linebuf[sizeof(linebuf)-2];
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194 do {
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195 *pLastChar = '\0';
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196 if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, xfp, NULL) == NULL)
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197 break;
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198 /* fgets read *something*; if it didn't get as
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199 far as pLastChar, it must have found a newline
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200 or hit the end of the file; if pLastChar is \n,
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201 it obviously found a newline; else we haven't
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202 yet seen a newline, so must continue */
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203 } while (*pLastChar != '\0' && *pLastChar != '\n');
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204 }
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205 if (i == lineno) {
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206 char *p = linebuf;
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207 while (*p == ' ' || *p == '\t' || *p == '\014')
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208 p++;
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209 err = PyFile_WriteString(p, f);
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210 if (err == 0 && strchr(p, '\n') == NULL)
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211 err = PyFile_WriteString("\n", f);
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212 }
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213 fclose(xfp);
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214 return err;
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215 }
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216
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217 static int
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218 tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
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219 {
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220 int err = 0;
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221 char linebuf[2000];
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222
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223 if (filename == NULL || name == NULL)
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224 return -1;
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225 /* This is needed by Emacs' compile command */
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226 #define FMT " File \"%.500s\", line %d, in %.500s\n"
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227 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
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228 err = PyFile_WriteString(linebuf, f);
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229 if (err != 0)
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230 return err;
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231
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232 err = PyFile_WriteString(" ", f);
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233 return Py_DisplaySourceLine(f, filename, lineno);
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234 }
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235
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236 static int
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237 tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
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238 {
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239 int err = 0;
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Christian Heimes <christian@cheimes.de>
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240 long depth = 0;
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241 PyTracebackObject *tb1 = tb;
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242 while (tb1 != NULL) {
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243 depth++;
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244 tb1 = tb1->tb_next;
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245 }
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246 while (tb != NULL && err == 0) {
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247 if (depth <= limit) {
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248 err = tb_displayline(f,
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249 PyUnicode_AsString(
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250 tb->tb_frame->f_code->co_filename),
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251 tb->tb_lineno,
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252 PyUnicode_AsString(tb->tb_frame->f_code->co_name));
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253 }
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254 depth--;
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255 tb = tb->tb_next;
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256 if (err == 0)
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257 err = PyErr_CheckSignals();
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258 }
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259 return err;
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260 }
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261
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262 #define PyTraceBack_LIMIT 1000
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263
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264 int
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265 PyTraceBack_Print(PyObject *v, PyObject *f)
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266 {
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267 int err;
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268 PyObject *limitv;
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269 long limit = PyTraceBack_LIMIT;
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270
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271 if (v == NULL)
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272 return 0;
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273 if (!PyTraceBack_Check(v)) {
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274 PyErr_BadInternalCall();
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275 return -1;
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276 }
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277 limitv = PySys_GetObject("tracebacklimit");
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278 if (limitv) {
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279 PyObject *exc_type, *exc_value, *exc_tb;
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280
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281 PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
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282 limit = PyLong_AsLong(limitv);
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283 if (limit == -1 && PyErr_Occurred()) {
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284 if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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285 limit = PyTraceBack_LIMIT;
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286 }
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287 else {
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288 Py_XDECREF(exc_type);
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289 Py_XDECREF(exc_value);
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290 Py_XDECREF(exc_tb);
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291 return 0;
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292 }
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293 }
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294 else if (limit <= 0) {
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295 limit = PyTraceBack_LIMIT;
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296 }
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297 PyErr_Restore(exc_type, exc_value, exc_tb);
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298 }
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299 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
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300 if (!err)
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301 err = tb_printinternal((PyTracebackObject *)v, f, limit);
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302 return err;
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303 }