Mercurial > cpython-lru_cache-weakref
annotate Python/modsupport.c @ 35125:cdec978b916c legacy-trunk
Add comments about PyThreadState and the usage of its fields.
| author | Brett Cannon <bcannon@gmail.com> |
|---|---|
| date | Sat, 25 Jun 2005 07:07:35 +0000 |
| parents | 391937571065 |
| children | fe4c627b2096 |
| rev | line source |
|---|---|
| 145 | 1 |
| 6 | 2 /* Module support implementation */ |
| 3 | |
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4 #include "Python.h" |
| 6 | 5 |
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6 typedef double va_double; |
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7 |
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8 /* Package context -- the full module name for package imports */ |
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9 char *_Py_PackageContext = NULL; |
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10 |
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11 /* Py_InitModule4() parameters: |
| 2095 | 12 - name is the module name |
| 13 - methods is the list of top-level functions | |
| 14 - doc is the documentation string | |
| 15 - passthrough is passed as self to functions defined in the module | |
| 16 - api_version is the value of PYTHON_API_VERSION at the time the | |
| 17 module was compiled | |
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18 |
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19 Return value is a borrowed reference to the module object; or NULL |
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20 if an error occurred (in Python 1.4 and before, errors were fatal). |
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21 Errors may still leak memory. |
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22 */ |
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23 |
| 2095 | 24 static char api_version_warning[] = |
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25 "Python C API version mismatch for module %.100s:\ |
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26 This Python has API version %d, module %.100s has version %d."; |
| 2095 | 27 |
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28 PyObject * |
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29 Py_InitModule4(char *name, PyMethodDef *methods, char *doc, |
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30 PyObject *passthrough, int module_api_version) |
| 6 | 31 { |
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32 PyObject *m, *d, *v, *n; |
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33 PyMethodDef *ml; |
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34 if (!Py_IsInitialized()) |
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35 Py_FatalError("Interpreter not initialized (version mismatch?)"); |
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36 if (module_api_version != PYTHON_API_VERSION) { |
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37 char message[512]; |
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38 PyOS_snprintf(message, sizeof(message), |
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39 api_version_warning, name, |
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40 PYTHON_API_VERSION, name, |
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41 module_api_version); |
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42 if (PyErr_Warn(PyExc_RuntimeWarning, message)) |
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43 return NULL; |
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44 } |
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45 /* Make sure name is fully qualified. |
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46 |
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47 This is a bit of a hack: when the shared library is loaded, |
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48 the module name is "package.module", but the module calls |
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49 Py_InitModule*() with just "module" for the name. The shared |
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50 library loader squirrels away the true name of the module in |
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51 _Py_PackageContext, and Py_InitModule*() will substitute this |
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52 (if the name actually matches). |
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53 */ |
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54 if (_Py_PackageContext != NULL) { |
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55 char *p = strrchr(_Py_PackageContext, '.'); |
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56 if (p != NULL && strcmp(name, p+1) == 0) { |
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57 name = _Py_PackageContext; |
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58 _Py_PackageContext = NULL; |
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59 } |
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60 } |
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61 if ((m = PyImport_AddModule(name)) == NULL) |
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62 return NULL; |
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63 d = PyModule_GetDict(m); |
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64 if (methods != NULL) { |
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65 n = PyString_FromString(name); |
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66 if (n == NULL) |
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67 return NULL; |
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68 for (ml = methods; ml->ml_name != NULL; ml++) { |
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69 if ((ml->ml_flags & METH_CLASS) || |
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70 (ml->ml_flags & METH_STATIC)) { |
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71 PyErr_SetString(PyExc_ValueError, |
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72 "module functions cannot set" |
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73 " METH_CLASS or METH_STATIC"); |
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74 return NULL; |
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75 } |
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76 v = PyCFunction_NewEx(ml, passthrough, n); |
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77 if (v == NULL) |
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78 return NULL; |
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79 if (PyDict_SetItemString(d, ml->ml_name, v) != 0) { |
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80 Py_DECREF(v); |
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81 return NULL; |
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82 } |
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83 Py_DECREF(v); |
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84 } |
| 6 | 85 } |
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86 if (doc != NULL) { |
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87 v = PyString_FromString(doc); |
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88 if (v == NULL || PyDict_SetItemString(d, "__doc__", v) != 0) { |
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89 Py_XDECREF(v); |
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90 return NULL; |
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91 } |
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92 Py_DECREF(v); |
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93 } |
| 86 | 94 return m; |
| 6 | 95 } |
| 96 | |
| 97 | |
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98 /* Helper for mkvalue() to scan the length of a format */ |
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99 |
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100 static int |
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101 countformat(char *format, int endchar) |
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102 { |
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103 int count = 0; |
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104 int level = 0; |
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105 while (level > 0 || *format != endchar) { |
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106 switch (*format) { |
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107 case '\0': |
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108 /* Premature end */ |
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109 PyErr_SetString(PyExc_SystemError, |
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110 "unmatched paren in format"); |
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111 return -1; |
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112 case '(': |
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113 case '[': |
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114 case '{': |
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115 if (level == 0) |
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116 count++; |
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117 level++; |
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118 break; |
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119 case ')': |
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120 case ']': |
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121 case '}': |
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122 level--; |
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123 break; |
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124 case '#': |
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126 case ',': |
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127 case ':': |
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128 case ' ': |
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129 case '\t': |
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130 break; |
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131 default: |
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132 if (level == 0) |
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133 count++; |
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134 } |
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135 format++; |
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136 } |
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137 return count; |
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138 } |
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139 |
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140 |
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141 /* Generic function to create a value -- the inverse of getargs() */ |
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142 /* After an original idea and first implementation by Steven Miale */ |
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143 |
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144 static PyObject *do_mktuple(char**, va_list *, int, int); |
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145 static PyObject *do_mklist(char**, va_list *, int, int); |
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146 static PyObject *do_mkdict(char**, va_list *, int, int); |
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147 static PyObject *do_mkvalue(char**, va_list *); |
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148 |
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149 |
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150 static PyObject * |
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151 do_mkdict(char **p_format, va_list *p_va, int endchar, int n) |
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152 { |
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153 PyObject *d; |
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154 int i; |
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155 int itemfailed = 0; |
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156 if (n < 0) |
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157 return NULL; |
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158 if ((d = PyDict_New()) == NULL) |
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159 return NULL; |
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160 /* Note that we can't bail immediately on error as this will leak |
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161 refcounts on any 'N' arguments. */ |
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162 for (i = 0; i < n; i+= 2) { |
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163 PyObject *k, *v; |
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164 int err; |
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165 k = do_mkvalue(p_format, p_va); |
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166 if (k == NULL) { |
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167 itemfailed = 1; |
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168 Py_INCREF(Py_None); |
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169 k = Py_None; |
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170 } |
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171 v = do_mkvalue(p_format, p_va); |
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172 if (v == NULL) { |
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173 itemfailed = 1; |
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174 Py_INCREF(Py_None); |
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175 v = Py_None; |
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176 } |
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177 err = PyDict_SetItem(d, k, v); |
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178 Py_DECREF(k); |
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179 Py_DECREF(v); |
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180 if (err < 0 || itemfailed) { |
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181 Py_DECREF(d); |
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182 return NULL; |
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183 } |
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184 } |
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185 if (d != NULL && **p_format != endchar) { |
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186 Py_DECREF(d); |
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187 d = NULL; |
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188 PyErr_SetString(PyExc_SystemError, |
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189 "Unmatched paren in format"); |
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190 } |
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191 else if (endchar) |
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192 ++*p_format; |
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193 return d; |
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194 } |
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195 |
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196 static PyObject * |
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197 do_mklist(char **p_format, va_list *p_va, int endchar, int n) |
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198 { |
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199 PyObject *v; |
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200 int i; |
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201 int itemfailed = 0; |
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202 if (n < 0) |
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203 return NULL; |
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204 if ((v = PyList_New(n)) == NULL) |
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205 return NULL; |
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206 /* Note that we can't bail immediately on error as this will leak |
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207 refcounts on any 'N' arguments. */ |
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208 for (i = 0; i < n; i++) { |
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209 PyObject *w = do_mkvalue(p_format, p_va); |
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210 if (w == NULL) { |
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211 itemfailed = 1; |
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212 Py_INCREF(Py_None); |
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213 w = Py_None; |
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214 } |
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215 PyList_SetItem(v, i, w); |
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216 } |
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217 if (v != NULL && **p_format != endchar) { |
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218 Py_DECREF(v); |
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219 v = NULL; |
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220 PyErr_SetString(PyExc_SystemError, |
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221 "Unmatched paren in format"); |
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222 } |
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223 else if (endchar) |
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224 ++*p_format; |
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225 if (itemfailed) { |
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226 Py_DECREF(v); |
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227 v = NULL; |
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228 } |
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229 return v; |
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230 } |
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231 |
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232 #ifdef Py_USING_UNICODE |
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233 static int |
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234 _ustrlen(Py_UNICODE *u) |
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235 { |
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236 int i = 0; |
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237 Py_UNICODE *v = u; |
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238 while (*v != 0) { i++; v++; } |
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239 return i; |
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240 } |
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241 #endif |
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242 |
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243 static PyObject * |
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244 do_mktuple(char **p_format, va_list *p_va, int endchar, int n) |
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245 { |
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246 PyObject *v; |
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247 int i; |
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248 int itemfailed = 0; |
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249 if (n < 0) |
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250 return NULL; |
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251 if ((v = PyTuple_New(n)) == NULL) |
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252 return NULL; |
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253 /* Note that we can't bail immediately on error as this will leak |
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254 refcounts on any 'N' arguments. */ |
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255 for (i = 0; i < n; i++) { |
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256 PyObject *w = do_mkvalue(p_format, p_va); |
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257 if (w == NULL) { |
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258 itemfailed = 1; |
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259 Py_INCREF(Py_None); |
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260 w = Py_None; |
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261 } |
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262 PyTuple_SetItem(v, i, w); |
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263 } |
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264 if (v != NULL && **p_format != endchar) { |
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265 Py_DECREF(v); |
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266 v = NULL; |
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267 PyErr_SetString(PyExc_SystemError, |
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268 "Unmatched paren in format"); |
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269 } |
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270 else if (endchar) |
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271 ++*p_format; |
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272 if (itemfailed) { |
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273 Py_DECREF(v); |
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274 v = NULL; |
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275 } |
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276 return v; |
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277 } |
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278 |
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279 static PyObject * |
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280 do_mkvalue(char **p_format, va_list *p_va) |
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281 { |
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282 for (;;) { |
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283 switch (*(*p_format)++) { |
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284 case '(': |
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285 return do_mktuple(p_format, p_va, ')', |
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286 countformat(*p_format, ')')); |
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287 |
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288 case '[': |
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289 return do_mklist(p_format, p_va, ']', |
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290 countformat(*p_format, ']')); |
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291 |
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292 case '{': |
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293 return do_mkdict(p_format, p_va, '}', |
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294 countformat(*p_format, '}')); |
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295 |
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296 case 'b': |
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297 case 'B': |
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298 case 'h': |
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299 case 'i': |
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300 return PyInt_FromLong((long)va_arg(*p_va, int)); |
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301 |
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302 case 'H': |
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303 return PyInt_FromLong((long)va_arg(*p_va, unsigned int)); |
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304 |
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305 case 'l': |
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306 return PyInt_FromLong((long)va_arg(*p_va, long)); |
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307 |
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308 case 'k': |
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309 return PyInt_FromLong((long)va_arg(*p_va, unsigned long)); |
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310 |
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311 #ifdef HAVE_LONG_LONG |
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312 case 'L': |
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313 return PyLong_FromLongLong((PY_LONG_LONG)va_arg(*p_va, PY_LONG_LONG)); |
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314 |
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315 case 'K': |
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316 return PyLong_FromLongLong((PY_LONG_LONG)va_arg(*p_va, unsigned PY_LONG_LONG)); |
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317 #endif |
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318 #ifdef Py_USING_UNICODE |
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319 case 'u': |
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320 { |
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321 PyObject *v; |
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322 Py_UNICODE *u = va_arg(*p_va, Py_UNICODE *); |
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323 int n; |
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324 if (**p_format == '#') { |
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325 ++*p_format; |
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326 n = va_arg(*p_va, int); |
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327 } |
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328 else |
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329 n = -1; |
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330 if (u == NULL) { |
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331 v = Py_None; |
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332 Py_INCREF(v); |
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333 } |
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334 else { |
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335 if (n < 0) |
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336 n = _ustrlen(u); |
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337 v = PyUnicode_FromUnicode(u, n); |
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338 } |
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339 return v; |
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340 } |
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341 #endif |
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342 case 'f': |
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343 case 'd': |
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344 return PyFloat_FromDouble( |
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345 (double)va_arg(*p_va, va_double)); |
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346 |
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347 #ifndef WITHOUT_COMPLEX |
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348 case 'D': |
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349 return PyComplex_FromCComplex( |
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350 *((Py_complex *)va_arg(*p_va, Py_complex *))); |
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351 #endif /* WITHOUT_COMPLEX */ |
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352 |
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353 case 'c': |
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354 { |
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355 char p[1]; |
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356 p[0] = va_arg(*p_va, int); |
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357 return PyString_FromStringAndSize(p, 1); |
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358 } |
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359 |
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360 case 's': |
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361 case 'z': |
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362 { |
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363 PyObject *v; |
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364 char *str = va_arg(*p_va, char *); |
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365 int n; |
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366 if (**p_format == '#') { |
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367 ++*p_format; |
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368 n = va_arg(*p_va, int); |
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369 } |
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370 else |
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371 n = -1; |
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372 if (str == NULL) { |
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373 v = Py_None; |
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374 Py_INCREF(v); |
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375 } |
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376 else { |
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377 if (n < 0) { |
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378 size_t m = strlen(str); |
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379 if (m > INT_MAX) { |
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380 PyErr_SetString(PyExc_OverflowError, |
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381 "string too long for Python string"); |
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382 return NULL; |
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383 } |
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384 n = (int)m; |
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385 } |
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386 v = PyString_FromStringAndSize(str, n); |
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387 } |
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388 return v; |
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389 } |
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390 |
|
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391 case 'N': |
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392 case 'S': |
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393 case 'O': |
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394 if (**p_format == '&') { |
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395 typedef PyObject *(*converter)(void *); |
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396 converter func = va_arg(*p_va, converter); |
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397 void *arg = va_arg(*p_va, void *); |
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398 ++*p_format; |
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399 return (*func)(arg); |
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400 } |
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401 else { |
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402 PyObject *v; |
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403 v = va_arg(*p_va, PyObject *); |
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404 if (v != NULL) { |
|
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405 if (*(*p_format - 1) != 'N') |
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406 Py_INCREF(v); |
|
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407 } |
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408 else if (!PyErr_Occurred()) |
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409 /* If a NULL was passed |
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410 * because a call that should |
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411 * have constructed a value |
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412 * failed, that's OK, and we |
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413 * pass the error on; but if |
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414 * no error occurred it's not |
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415 * clear that the caller knew |
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416 * what she was doing. */ |
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417 PyErr_SetString(PyExc_SystemError, |
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418 "NULL object passed to Py_BuildValue"); |
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419 return v; |
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420 } |
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421 |
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422 case ':': |
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423 case ',': |
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424 case ' ': |
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425 case '\t': |
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426 break; |
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427 |
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428 default: |
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429 PyErr_SetString(PyExc_SystemError, |
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430 "bad format char passed to Py_BuildValue"); |
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431 return NULL; |
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432 |
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433 } |
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434 } |
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435 } |
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436 |
|
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437 |
|
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|
438 PyObject * |
|
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|
439 Py_BuildValue(char *format, ...) |
|
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440 { |
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441 va_list va; |
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442 PyObject* retval; |
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443 va_start(va, format); |
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444 retval = Py_VaBuildValue(format, va); |
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445 va_end(va); |
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446 return retval; |
|
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447 } |
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448 |
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449 PyObject * |
|
13658
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|
450 Py_VaBuildValue(char *format, va_list va) |
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451 { |
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452 char *f = format; |
|
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|
453 int n = countformat(f, '\0'); |
|
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454 va_list lva; |
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455 |
|
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456 #ifdef VA_LIST_IS_ARRAY |
|
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457 memcpy(lva, va, sizeof(va_list)); |
|
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458 #else |
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459 #ifdef __va_copy |
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460 __va_copy(lva, va); |
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461 #else |
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462 lva = va; |
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463 #endif |
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464 #endif |
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465 |
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466 if (n < 0) |
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467 return NULL; |
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468 if (n == 0) { |
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469 Py_INCREF(Py_None); |
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470 return Py_None; |
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471 } |
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472 if (n == 1) |
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473 return do_mkvalue(&f, &lva); |
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474 return do_mktuple(&f, &lva, '\0', n); |
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475 } |
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476 |
|
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477 |
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478 PyObject * |
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479 PyEval_CallFunction(PyObject *obj, char *format, ...) |
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480 { |
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481 va_list vargs; |
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482 PyObject *args; |
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483 PyObject *res; |
|
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484 |
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485 va_start(vargs, format); |
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486 |
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487 args = Py_VaBuildValue(format, vargs); |
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488 va_end(vargs); |
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489 |
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490 if (args == NULL) |
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491 return NULL; |
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492 |
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493 res = PyEval_CallObject(obj, args); |
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494 Py_DECREF(args); |
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495 |
|
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496 return res; |
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497 } |
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498 |
|
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499 |
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500 PyObject * |
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501 PyEval_CallMethod(PyObject *obj, char *methodname, char *format, ...) |
|
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502 { |
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503 va_list vargs; |
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504 PyObject *meth; |
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505 PyObject *args; |
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506 PyObject *res; |
|
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507 |
|
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508 meth = PyObject_GetAttrString(obj, methodname); |
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509 if (meth == NULL) |
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510 return NULL; |
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511 |
|
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512 va_start(vargs, format); |
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513 |
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514 args = Py_VaBuildValue(format, vargs); |
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515 va_end(vargs); |
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516 |
|
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517 if (args == NULL) { |
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518 Py_DECREF(meth); |
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519 return NULL; |
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520 } |
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521 |
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522 res = PyEval_CallObject(meth, args); |
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523 Py_DECREF(meth); |
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524 Py_DECREF(args); |
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525 |
|
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526 return res; |
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527 } |
|
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|
528 |
|
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|
529 int |
|
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|
530 PyModule_AddObject(PyObject *m, char *name, PyObject *o) |
|
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|
531 { |
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|
532 PyObject *dict; |
| 29579 | 533 if (!PyModule_Check(m)) { |
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534 PyErr_SetString(PyExc_TypeError, |
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535 "PyModule_AddObject() needs module as first arg"); |
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536 return -1; |
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537 } |
| 29579 | 538 if (!o) { |
|
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|
539 if (!PyErr_Occurred()) |
|
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|
540 PyErr_SetString(PyExc_TypeError, |
|
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|
541 "PyModule_AddObject() needs non-NULL value"); |
| 29579 | 542 return -1; |
| 543 } | |
| 544 | |
|
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|
545 dict = PyModule_GetDict(m); |
|
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|
546 if (dict == NULL) { |
|
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|
547 /* Internal error -- modules must have a dict! */ |
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548 PyErr_Format(PyExc_SystemError, "module '%s' has no __dict__", |
|
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549 PyModule_GetName(m)); |
|
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|
550 return -1; |
|
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551 } |
|
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552 if (PyDict_SetItemString(dict, name, o)) |
|
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|
553 return -1; |
|
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|
554 Py_DECREF(o); |
|
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|
555 return 0; |
|
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556 } |
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|
557 |
|
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558 int |
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|
559 PyModule_AddIntConstant(PyObject *m, char *name, long value) |
|
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|
560 { |
|
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561 return PyModule_AddObject(m, name, PyInt_FromLong(value)); |
|
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562 } |
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|
563 |
|
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564 int |
|
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|
565 PyModule_AddStringConstant(PyObject *m, char *name, char *value) |
|
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|
566 { |
|
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567 return PyModule_AddObject(m, name, PyString_FromString(value)); |
|
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|
568 } |
