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Massive changes for separate thread state management. All per-thread globals are moved into a struct which is manipulated separately.
author Guido van Rossum <guido@python.org>
date Mon, 05 May 1997 20:56:21 +0000
parents 1ea1f019268d
children 422960523286
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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 void
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59 PyErr_Restore(type, value, traceback)
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60 PyObject *type;
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61 PyObject *value;
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62 PyObject *traceback;
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63 {
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64 PyThreadState *tstate = PyThreadState_Get();
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65 PyObject *oldtype, *oldvalue, *oldtraceback;
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66
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67 if (traceback != NULL && !PyTraceBack_Check(traceback)) {
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68 /* XXX Should never happen -- fatal error instead? */
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69 Py_DECREF(traceback);
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70 traceback = NULL;
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71 }
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72
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73 /* Save these in locals to safeguard against recursive
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74 invocation through Py_XDECREF */
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75 oldtype = tstate->curexc_type;
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76 oldvalue = tstate->curexc_value;
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77 oldtraceback = tstate->curexc_traceback;
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78
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79 tstate->curexc_type = type;
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80 tstate->curexc_value = value;
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81 tstate->curexc_traceback = traceback;
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82
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83 Py_XDECREF(oldtype);
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84 Py_XDECREF(oldvalue);
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85 Py_XDECREF(oldtraceback);
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86 }
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87
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88 void
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89 PyErr_SetObject(exception, value)
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90 PyObject *exception;
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91 PyObject *value;
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92 {
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93 Py_XINCREF(exception);
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94 Py_XINCREF(value);
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95 PyErr_Restore(exception, value, (PyObject *)NULL);
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96 }
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98 void
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99 PyErr_SetNone(exception)
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100 PyObject *exception;
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101 {
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102 PyErr_SetObject(exception, (PyObject *)NULL);
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103 }
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105 void
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106 PyErr_SetString(exception, string)
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107 PyObject *exception;
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108 const char *string;
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109 {
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110 PyObject *value = PyString_FromString(string);
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111 PyErr_SetObject(exception, value);
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112 Py_XDECREF(value);
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113 }
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114
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115
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116 PyObject *
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117 PyErr_Occurred()
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118 {
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119 PyThreadState *tstate = PyThreadState_Get();
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120
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121 return tstate->curexc_type;
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122 }
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124 void
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125 PyErr_Fetch(p_type, p_value, p_traceback)
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126 PyObject **p_type;
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127 PyObject **p_value;
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128 PyObject **p_traceback;
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129 {
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130 PyThreadState *tstate = PyThreadState_Get();
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131
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132 *p_type = tstate->curexc_type;
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133 *p_value = tstate->curexc_value;
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134 *p_traceback = tstate->curexc_traceback;
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135
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136 tstate->curexc_type = NULL;
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137 tstate->curexc_value = NULL;
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138 tstate->curexc_traceback = NULL;
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139 }
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141 void
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142 PyErr_Clear()
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143 {
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144 PyErr_Restore(NULL, NULL, NULL);
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145 }
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146
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147 /* Convenience functions to set a type error exception and return 0 */
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148
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149 int
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150 PyErr_BadArgument()
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151 {
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152 PyErr_SetString(PyExc_TypeError,
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153 "illegal argument type for built-in operation");
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154 return 0;
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155 }
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156
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157 PyObject *
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158 PyErr_NoMemory()
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159 {
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160 PyErr_SetNone(PyExc_MemoryError);
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161 return NULL;
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162 }
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163
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164 PyObject *
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165 PyErr_SetFromErrno(exc)
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166 PyObject *exc;
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167 {
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168 PyObject *v;
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169 int i = errno;
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170 #ifdef EINTR
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171 if (i == EINTR && PyErr_CheckSignals())
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172 return NULL;
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173 #endif
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174 v = Py_BuildValue("(is)", i, strerror(i));
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175 if (v != NULL) {
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176 PyErr_SetObject(exc, v);
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177 Py_DECREF(v);
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178 }
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179 return NULL;
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180 }
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181
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182 void
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183 PyErr_BadInternalCall()
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184 {
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185 PyErr_SetString(PyExc_SystemError,
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186 "bad argument to internal function");
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187 }
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188
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189
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190 #ifdef HAVE_STDARG_PROTOTYPES
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191 PyObject *
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192 PyErr_Format(PyObject *exception, const char *format, ...)
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193 #else
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194 PyObject *
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195 PyErr_Format(exception, format, va_alist)
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196 PyObject *exception;
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197 const char *format;
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198 va_dcl
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199 #endif
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200 {
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201 va_list vargs;
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202 char buffer[500]; /* Caller is responsible for limiting the format */
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203
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204 #ifdef HAVE_STDARG_PROTOTYPES
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205 va_start(vargs, format);
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206 #else
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207 va_start(vargs);
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208 #endif
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209
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210 vsprintf(buffer, format, vargs);
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211 PyErr_SetString(exception, buffer);
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212 return NULL;
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213 }