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annotate Python/errors.c @ 5370:1ea1f019268d legacy-trunk

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Quickly renamed. Also removed the long comment explaining why this is better than the old error API.
author Guido van Rossum <guido@python.org>
date Tue, 29 Apr 1997 18:22:47 +0000
parents 2c4b802a3b5d
children b7871ca930ad
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Error handling */
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33
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34 #include "Python.h"
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35
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36 #ifdef SYMANTEC__CFM68K__
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37 #pragma lib_export on
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38 #endif
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39
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40 #ifdef macintosh
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41 #ifndef __MSL__
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42 /* Replace strerror with a Mac specific routine.
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43 XXX PROBLEM: some positive errors have a meaning for MacOS,
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44 but some library routines set Unix error numbers...
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45 */
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46 extern char *PyMac_StrError Py_PROTO((int));
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47 #undef strerror
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48 #define strerror PyMac_StrError
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49 #endif
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50 #endif /* macintosh */
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51
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52 #ifndef __STDC__
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53 #ifndef MS_WINDOWS
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54 extern char *strerror Py_PROTO((int));
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55 #endif
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56 #endif
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57
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58 /* Last exception stored */
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59
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60 static PyObject *last_exception;
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61 static PyObject *last_exc_val;
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63 void
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64 PyErr_Restore(exception, value, traceback)
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65 PyObject *exception;
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66 PyObject *value;
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67 PyObject *traceback;
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68 {
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69 PyErr_Clear();
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70
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71 last_exception = exception;
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72 last_exc_val = value;
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73 (void) PyTraceBack_Store(traceback);
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74 Py_XDECREF(traceback);
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75 }
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77 void
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78 PyErr_SetObject(exception, value)
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79 PyObject *exception;
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80 PyObject *value;
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81 {
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82 Py_XINCREF(exception);
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83 Py_XINCREF(value);
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84 PyErr_Restore(exception, value, (PyObject *)NULL);
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85 }
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87 void
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88 PyErr_SetNone(exception)
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89 PyObject *exception;
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90 {
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91 PyErr_SetObject(exception, (PyObject *)NULL);
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92 }
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93
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94 void
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95 PyErr_SetString(exception, string)
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96 PyObject *exception;
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97 const char *string;
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98 {
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99 PyObject *value = PyString_FromString(string);
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100 PyErr_SetObject(exception, value);
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101 Py_XDECREF(value);
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102 }
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103
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104
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105 PyObject *
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106 PyErr_Occurred()
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107 {
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108 return last_exception;
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109 }
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111 void
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112 PyErr_Fetch(p_exc, p_val, p_tb)
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113 PyObject **p_exc;
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114 PyObject **p_val;
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115 PyObject **p_tb;
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116 {
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117 *p_exc = last_exception;
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118 last_exception = NULL;
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119 *p_val = last_exc_val;
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120 last_exc_val = NULL;
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121 *p_tb = PyTraceBack_Fetch();
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122 }
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124 void
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125 PyErr_Clear()
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126 {
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127 PyObject *tb;
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128 Py_XDECREF(last_exception);
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129 last_exception = NULL;
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130 Py_XDECREF(last_exc_val);
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131 last_exc_val = NULL;
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132 /* Also clear interpreter stack trace */
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133 tb = PyTraceBack_Fetch();
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134 Py_XDECREF(tb);
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135 }
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136
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137 /* Convenience functions to set a type error exception and return 0 */
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138
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139 int
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140 PyErr_BadArgument()
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141 {
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142 PyErr_SetString(PyExc_TypeError, "illegal argument type for built-in operation");
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143 return 0;
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144 }
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145
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146 PyObject *
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147 PyErr_NoMemory()
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148 {
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149 PyErr_SetNone(PyExc_MemoryError);
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150 return NULL;
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151 }
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152
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153 PyObject *
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154 PyErr_SetFromErrno(exc)
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155 PyObject *exc;
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156 {
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157 PyObject *v;
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158 int i = errno;
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159 #ifdef EINTR
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160 if (i == EINTR && PyErr_CheckSignals())
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161 return NULL;
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162 #endif
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163 v = Py_BuildValue("(is)", i, strerror(i));
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164 if (v != NULL) {
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165 PyErr_SetObject(exc, v);
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166 Py_DECREF(v);
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167 }
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168 return NULL;
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169 }
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170
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171 void
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172 PyErr_BadInternalCall()
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173 {
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174 PyErr_SetString(PyExc_SystemError, "bad argument to internal function");
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175 }
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176
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177
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178 #ifdef HAVE_STDARG_PROTOTYPES
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179 PyObject *
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180 PyErr_Format(PyObject *exception, const char *format, ...)
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181 #else
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182 PyObject *
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183 PyErr_Format(exception, format, va_alist)
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184 PyObject *exception;
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185 const char *format;
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186 va_dcl
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187 #endif
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188 {
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189 va_list vargs;
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190 char buffer[500]; /* Caller is responsible for limiting the format */
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191
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192 #ifdef HAVE_STDARG_PROTOTYPES
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193 va_start(vargs, format);
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194 #else
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195 va_start(vargs);
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196 #endif
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197
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198 vsprintf(buffer, format, vargs);
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199 PyErr_SetString(exception, buffer);
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200 return NULL;
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201 }