Mercurial > cpython-lru_cache-weakref
annotate Objects/fileobject.c @ 87690:66c1c9f32567 default tip
Add use_weakref option to functools.lru_cache
The use_weakref option makes lru_cache create weak references to the function
arguments when creating the cache key, which prevents them from staying in the
memory forever even after all other references to them are gone.
This is a proof of concept for http://bugs.python.org/issue19859
| author | Radomir Dopieralski <devel@sheep.art.pl> |
|---|---|
| date | Tue, 03 Dec 2013 16:02:48 +0100 |
| parents | 3055e61f1e66 |
| children |
| rev | line source |
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1 /* File object implementation (what's left of it -- see io.py) */ |
| 6 | 2 |
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3 #define PY_SSIZE_T_CLEAN |
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4 #include "Python.h" |
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6 #ifdef HAVE_GETC_UNLOCKED |
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7 #define GETC(f) getc_unlocked(f) |
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8 #define FLOCKFILE(f) flockfile(f) |
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9 #define FUNLOCKFILE(f) funlockfile(f) |
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10 #else |
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11 #define GETC(f) getc(f) |
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12 #define FLOCKFILE(f) |
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13 #define FUNLOCKFILE(f) |
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14 #endif |
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15 |
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16 /* Newline flags */ |
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17 #define NEWLINE_UNKNOWN 0 /* No newline seen, yet */ |
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18 #define NEWLINE_CR 1 /* \r newline seen */ |
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19 #define NEWLINE_LF 2 /* \n newline seen */ |
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20 #define NEWLINE_CRLF 4 /* \r\n newline seen */ |
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21 |
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22 #ifdef __cplusplus |
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23 extern "C" { |
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24 #endif |
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25 |
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26 /* External C interface */ |
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27 |
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28 PyObject * |
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29 PyFile_FromFd(int fd, const char *name, const char *mode, int buffering, const char *encoding, |
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30 const char *errors, const char *newline, int closefd) |
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31 { |
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32 PyObject *io, *stream; |
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33 _Py_IDENTIFIER(open); |
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34 |
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35 io = PyImport_ImportModule("io"); |
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36 if (io == NULL) |
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37 return NULL; |
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38 stream = _PyObject_CallMethodId(io, &PyId_open, "isisssi", fd, mode, |
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39 buffering, encoding, errors, |
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40 newline, closefd); |
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41 Py_DECREF(io); |
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42 if (stream == NULL) |
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43 return NULL; |
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44 /* ignore name attribute because the name attribute of _BufferedIOMixin |
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45 and TextIOWrapper is read only */ |
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46 return stream; |
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47 } |
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48 |
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49 PyObject * |
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50 PyFile_GetLine(PyObject *f, int n) |
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51 { |
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52 PyObject *result; |
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53 |
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54 if (f == NULL) { |
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55 PyErr_BadInternalCall(); |
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56 return NULL; |
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57 } |
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58 |
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59 { |
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60 PyObject *reader; |
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61 PyObject *args; |
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62 _Py_IDENTIFIER(readline); |
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63 |
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64 reader = _PyObject_GetAttrId(f, &PyId_readline); |
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65 if (reader == NULL) |
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66 return NULL; |
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67 if (n <= 0) |
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68 args = PyTuple_New(0); |
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69 else |
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70 args = Py_BuildValue("(i)", n); |
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71 if (args == NULL) { |
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72 Py_DECREF(reader); |
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73 return NULL; |
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74 } |
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75 result = PyEval_CallObject(reader, args); |
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76 Py_DECREF(reader); |
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77 Py_DECREF(args); |
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78 if (result != NULL && !PyBytes_Check(result) && |
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79 !PyUnicode_Check(result)) { |
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80 Py_DECREF(result); |
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81 result = NULL; |
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82 PyErr_SetString(PyExc_TypeError, |
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83 "object.readline() returned non-string"); |
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84 } |
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85 } |
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86 |
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87 if (n < 0 && result != NULL && PyBytes_Check(result)) { |
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88 char *s = PyBytes_AS_STRING(result); |
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89 Py_ssize_t len = PyBytes_GET_SIZE(result); |
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90 if (len == 0) { |
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91 Py_DECREF(result); |
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92 result = NULL; |
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93 PyErr_SetString(PyExc_EOFError, |
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94 "EOF when reading a line"); |
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95 } |
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96 else if (s[len-1] == '\n') { |
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97 if (result->ob_refcnt == 1) |
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98 _PyBytes_Resize(&result, len-1); |
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99 else { |
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100 PyObject *v; |
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101 v = PyBytes_FromStringAndSize(s, len-1); |
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102 Py_DECREF(result); |
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103 result = v; |
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104 } |
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105 } |
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106 } |
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107 if (n < 0 && result != NULL && PyUnicode_Check(result)) { |
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110 Py_DECREF(result); |
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111 result = NULL; |
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112 PyErr_SetString(PyExc_EOFError, |
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113 "EOF when reading a line"); |
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114 } |
| 72475 | 115 else if (PyUnicode_READ_CHAR(result, len-1) == '\n') { |
| 116 PyObject *v; | |
| 117 v = PyUnicode_Substring(result, 0, len-1); | |
| 118 Py_DECREF(result); | |
| 119 result = v; | |
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120 } |
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121 } |
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122 return result; |
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183
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123 } |
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125 /* Interfaces to write objects/strings to file-like objects */ |
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126 |
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127 int |
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128 PyFile_WriteObject(PyObject *v, PyObject *f, int flags) |
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129 { |
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130 PyObject *writer, *value, *args, *result; |
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131 _Py_IDENTIFIER(write); |
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132 |
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133 if (f == NULL) { |
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134 PyErr_SetString(PyExc_TypeError, "writeobject with NULL file"); |
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135 return -1; |
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136 } |
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137 writer = _PyObject_GetAttrId(f, &PyId_write); |
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138 if (writer == NULL) |
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139 return -1; |
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140 if (flags & Py_PRINT_RAW) { |
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141 value = PyObject_Str(v); |
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142 } |
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143 else |
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144 value = PyObject_Repr(v); |
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145 if (value == NULL) { |
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146 Py_DECREF(writer); |
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147 return -1; |
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148 } |
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149 args = PyTuple_Pack(1, value); |
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150 if (args == NULL) { |
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151 Py_DECREF(value); |
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152 Py_DECREF(writer); |
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153 return -1; |
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154 } |
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155 result = PyEval_CallObject(writer, args); |
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156 Py_DECREF(args); |
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157 Py_DECREF(value); |
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158 Py_DECREF(writer); |
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159 if (result == NULL) |
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160 return -1; |
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161 Py_DECREF(result); |
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162 return 0; |
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163 } |
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164 |
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165 int |
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166 PyFile_WriteString(const char *s, PyObject *f) |
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167 { |
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168 if (f == NULL) { |
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169 /* Should be caused by a pre-existing error */ |
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170 if (!PyErr_Occurred()) |
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171 PyErr_SetString(PyExc_SystemError, |
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172 "null file for PyFile_WriteString"); |
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173 return -1; |
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174 } |
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175 else if (!PyErr_Occurred()) { |
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176 PyObject *v = PyUnicode_FromString(s); |
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177 int err; |
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178 if (v == NULL) |
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179 return -1; |
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180 err = PyFile_WriteObject(v, f, Py_PRINT_RAW); |
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181 Py_DECREF(v); |
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182 return err; |
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183 } |
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184 else |
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185 return -1; |
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186 } |
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187 |
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188 /* Try to get a file-descriptor from a Python object. If the object |
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189 is an integer, its value is returned. If not, the |
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190 object's fileno() method is called if it exists; the method must return |
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191 an integer, which is returned as the file descriptor value. |
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192 -1 is returned on failure. |
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193 */ |
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194 |
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195 int |
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196 PyObject_AsFileDescriptor(PyObject *o) |
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197 { |
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198 int fd; |
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199 PyObject *meth; |
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200 _Py_IDENTIFIER(fileno); |
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201 |
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202 if (PyLong_Check(o)) { |
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203 fd = _PyLong_AsInt(o); |
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204 } |
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205 else if ((meth = _PyObject_GetAttrId(o, &PyId_fileno)) != NULL) |
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206 { |
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207 PyObject *fno = PyEval_CallObject(meth, NULL); |
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208 Py_DECREF(meth); |
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209 if (fno == NULL) |
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210 return -1; |
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211 |
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212 if (PyLong_Check(fno)) { |
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213 fd = _PyLong_AsInt(fno); |
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214 Py_DECREF(fno); |
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215 } |
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216 else { |
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217 PyErr_SetString(PyExc_TypeError, |
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218 "fileno() returned a non-integer"); |
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219 Py_DECREF(fno); |
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220 return -1; |
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221 } |
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222 } |
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223 else { |
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224 PyErr_SetString(PyExc_TypeError, |
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225 "argument must be an int, or have a fileno() method."); |
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226 return -1; |
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227 } |
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228 |
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229 if (fd == -1 && PyErr_Occurred()) |
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230 return -1; |
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231 if (fd < 0) { |
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232 PyErr_Format(PyExc_ValueError, |
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233 "file descriptor cannot be a negative integer (%i)", |
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234 fd); |
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235 return -1; |
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236 } |
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237 return fd; |
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238 } |
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239 |
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240 /* |
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241 ** Py_UniversalNewlineFgets is an fgets variation that understands |
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242 ** all of \r, \n and \r\n conventions. |
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243 ** The stream should be opened in binary mode. |
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244 ** If fobj is NULL the routine always does newline conversion, and |
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245 ** it may peek one char ahead to gobble the second char in \r\n. |
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246 ** If fobj is non-NULL it must be a PyFileObject. In this case there |
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247 ** is no readahead but in stead a flag is used to skip a following |
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248 ** \n on the next read. Also, if the file is open in binary mode |
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249 ** the whole conversion is skipped. Finally, the routine keeps track of |
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250 ** the different types of newlines seen. |
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251 ** Note that we need no error handling: fgets() treats error and eof |
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252 ** identically. |
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253 */ |
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254 char * |
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255 Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj) |
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256 { |
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257 char *p = buf; |
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258 int c; |
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259 int newlinetypes = 0; |
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260 int skipnextlf = 0; |
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261 |
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262 if (fobj) { |
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263 errno = ENXIO; /* What can you do... */ |
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264 return NULL; |
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265 } |
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266 FLOCKFILE(stream); |
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267 c = 'x'; /* Shut up gcc warning */ |
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268 while (--n > 0 && (c = GETC(stream)) != EOF ) { |
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269 if (skipnextlf ) { |
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270 skipnextlf = 0; |
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271 if (c == '\n') { |
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272 /* Seeing a \n here with skipnextlf true |
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273 ** means we saw a \r before. |
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274 */ |
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275 newlinetypes |= NEWLINE_CRLF; |
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276 c = GETC(stream); |
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277 if (c == EOF) break; |
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278 } else { |
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279 /* |
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280 ** Note that c == EOF also brings us here, |
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281 ** so we're okay if the last char in the file |
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282 ** is a CR. |
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283 */ |
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284 newlinetypes |= NEWLINE_CR; |
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285 } |
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286 } |
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287 if (c == '\r') { |
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288 /* A \r is translated into a \n, and we skip |
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289 ** an adjacent \n, if any. We don't set the |
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290 ** newlinetypes flag until we've seen the next char. |
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291 */ |
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292 skipnextlf = 1; |
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293 c = '\n'; |
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294 } else if ( c == '\n') { |
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295 newlinetypes |= NEWLINE_LF; |
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296 } |
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297 *p++ = c; |
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298 if (c == '\n') break; |
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299 } |
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300 /* if ( c == EOF && skipnextlf ) |
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301 newlinetypes |= NEWLINE_CR; */ |
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302 FUNLOCKFILE(stream); |
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303 *p = '\0'; |
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304 if ( skipnextlf ) { |
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305 /* If we have no file object we cannot save the |
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306 ** skipnextlf flag. We have to readahead, which |
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307 ** will cause a pause if we're reading from an |
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308 ** interactive stream, but that is very unlikely |
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309 ** unless we're doing something silly like |
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310 ** exec(open("/dev/tty").read()). |
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311 */ |
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312 c = GETC(stream); |
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313 if ( c != '\n' ) |
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314 ungetc(c, stream); |
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315 } |
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316 if (p == buf) |
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317 return NULL; |
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318 return buf; |
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319 } |
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320 |
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321 /* **************************** std printer **************************** |
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322 * The stdprinter is used during the boot strapping phase as a preliminary |
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323 * file like object for sys.stderr. |
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324 */ |
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325 |
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326 typedef struct { |
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327 PyObject_HEAD |
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328 int fd; |
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329 } PyStdPrinter_Object; |
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330 |
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331 static PyObject * |
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332 stdprinter_new(PyTypeObject *type, PyObject *args, PyObject *kews) |
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333 { |
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334 PyStdPrinter_Object *self; |
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335 |
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336 assert(type != NULL && type->tp_alloc != NULL); |
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337 |
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338 self = (PyStdPrinter_Object *) type->tp_alloc(type, 0); |
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339 if (self != NULL) { |
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340 self->fd = -1; |
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341 } |
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342 |
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343 return (PyObject *) self; |
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344 } |
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345 |
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346 static int |
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347 stdprinter_init(PyObject *self, PyObject *args, PyObject *kwds) |
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348 { |
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349 PyErr_SetString(PyExc_TypeError, |
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350 "cannot create 'stderrprinter' instances"); |
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351 return -1; |
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352 } |
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353 |
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354 PyObject * |
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355 PyFile_NewStdPrinter(int fd) |
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356 { |
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357 PyStdPrinter_Object *self; |
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358 |
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359 if (fd != fileno(stdout) && fd != fileno(stderr)) { |
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360 /* not enough infrastructure for PyErr_BadInternalCall() */ |
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361 return NULL; |
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362 } |
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363 |
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364 self = PyObject_New(PyStdPrinter_Object, |
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365 &PyStdPrinter_Type); |
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366 if (self != NULL) { |
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367 self->fd = fd; |
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368 } |
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369 return (PyObject*)self; |
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370 } |
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371 |
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372 static PyObject * |
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373 stdprinter_write(PyStdPrinter_Object *self, PyObject *args) |
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374 { |
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375 char *c; |
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376 Py_ssize_t n; |
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377 |
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378 if (self->fd < 0) { |
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379 /* fd might be invalid on Windows |
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380 * I can't raise an exception here. It may lead to an |
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381 * unlimited recursion in the case stderr is invalid. |
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382 */ |
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383 Py_RETURN_NONE; |
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384 } |
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385 |
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386 if (!PyArg_ParseTuple(args, "s", &c)) { |
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387 return NULL; |
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388 } |
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389 n = strlen(c); |
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390 |
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391 Py_BEGIN_ALLOW_THREADS |
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392 errno = 0; |
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393 #ifdef MS_WINDOWS |
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394 if (n > INT_MAX) |
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395 n = INT_MAX; |
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396 n = write(self->fd, c, (int)n); |
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397 #else |
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398 n = write(self->fd, c, n); |
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399 #endif |
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400 Py_END_ALLOW_THREADS |
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401 |
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402 if (n < 0) { |
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403 if (errno == EAGAIN) |
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404 Py_RETURN_NONE; |
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405 PyErr_SetFromErrno(PyExc_IOError); |
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406 return NULL; |
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407 } |
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408 |
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409 return PyLong_FromSsize_t(n); |
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410 } |
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411 |
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412 static PyObject * |
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413 stdprinter_fileno(PyStdPrinter_Object *self) |
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414 { |
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415 return PyLong_FromLong((long) self->fd); |
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416 } |
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417 |
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418 static PyObject * |
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419 stdprinter_repr(PyStdPrinter_Object *self) |
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420 { |
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421 return PyUnicode_FromFormat("<stdprinter(fd=%d) object at 0x%x>", |
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422 self->fd, self); |
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423 } |
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424 |
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425 static PyObject * |
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426 stdprinter_noop(PyStdPrinter_Object *self) |
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427 { |
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428 Py_RETURN_NONE; |
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429 } |
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430 |
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431 static PyObject * |
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432 stdprinter_isatty(PyStdPrinter_Object *self) |
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433 { |
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434 long res; |
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435 if (self->fd < 0) { |
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436 Py_RETURN_FALSE; |
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437 } |
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438 |
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439 Py_BEGIN_ALLOW_THREADS |
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440 res = isatty(self->fd); |
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441 Py_END_ALLOW_THREADS |
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442 |
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443 return PyBool_FromLong(res); |
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444 } |
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445 |
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446 static PyMethodDef stdprinter_methods[] = { |
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447 {"close", (PyCFunction)stdprinter_noop, METH_NOARGS, ""}, |
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448 {"flush", (PyCFunction)stdprinter_noop, METH_NOARGS, ""}, |
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449 {"fileno", (PyCFunction)stdprinter_fileno, METH_NOARGS, ""}, |
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450 {"isatty", (PyCFunction)stdprinter_isatty, METH_NOARGS, ""}, |
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451 {"write", (PyCFunction)stdprinter_write, METH_VARARGS, ""}, |
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452 {NULL, NULL} /*sentinel */ |
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453 }; |
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454 |
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455 static PyObject * |
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456 get_closed(PyStdPrinter_Object *self, void *closure) |
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457 { |
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458 Py_INCREF(Py_False); |
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459 return Py_False; |
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460 } |
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461 |
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462 static PyObject * |
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463 get_mode(PyStdPrinter_Object *self, void *closure) |
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464 { |
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465 return PyUnicode_FromString("w"); |
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466 } |
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467 |
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468 static PyObject * |
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469 get_encoding(PyStdPrinter_Object *self, void *closure) |
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470 { |
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471 Py_RETURN_NONE; |
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472 } |
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473 |
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474 static PyGetSetDef stdprinter_getsetlist[] = { |
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475 {"closed", (getter)get_closed, NULL, "True if the file is closed"}, |
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476 {"encoding", (getter)get_encoding, NULL, "Encoding of the file"}, |
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477 {"mode", (getter)get_mode, NULL, "String giving the file mode"}, |
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478 {0}, |
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479 }; |
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480 |
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481 PyTypeObject PyStdPrinter_Type = { |
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482 PyVarObject_HEAD_INIT(&PyType_Type, 0) |
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483 "stderrprinter", /* tp_name */ |
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484 sizeof(PyStdPrinter_Object), /* tp_basicsize */ |
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485 0, /* tp_itemsize */ |
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486 /* methods */ |
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487 0, /* tp_dealloc */ |
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488 0, /* tp_print */ |
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489 0, /* tp_getattr */ |
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490 0, /* tp_setattr */ |
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491 0, /* tp_reserved */ |
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492 (reprfunc)stdprinter_repr, /* tp_repr */ |
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493 0, /* tp_as_number */ |
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494 0, /* tp_as_sequence */ |
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495 0, /* tp_as_mapping */ |
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496 0, /* tp_hash */ |
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497 0, /* tp_call */ |
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498 0, /* tp_str */ |
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499 PyObject_GenericGetAttr, /* tp_getattro */ |
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500 0, /* tp_setattro */ |
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501 0, /* tp_as_buffer */ |
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502 Py_TPFLAGS_DEFAULT, /* tp_flags */ |
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503 0, /* tp_doc */ |
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504 0, /* tp_traverse */ |
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505 0, /* tp_clear */ |
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506 0, /* tp_richcompare */ |
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507 0, /* tp_weaklistoffset */ |
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508 0, /* tp_iter */ |
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509 0, /* tp_iternext */ |
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510 stdprinter_methods, /* tp_methods */ |
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511 0, /* tp_members */ |
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512 stdprinter_getsetlist, /* tp_getset */ |
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513 0, /* tp_base */ |
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514 0, /* tp_dict */ |
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515 0, /* tp_descr_get */ |
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516 0, /* tp_descr_set */ |
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517 0, /* tp_dictoffset */ |
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518 stdprinter_init, /* tp_init */ |
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519 PyType_GenericAlloc, /* tp_alloc */ |
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520 stdprinter_new, /* tp_new */ |
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521 PyObject_Del, /* tp_free */ |
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522 }; |
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523 |
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524 |
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525 #ifdef __cplusplus |
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526 } |
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527 #endif |
