Mercurial > cpython-lru_cache-weakref

annotate Objects/fileobject.c @ 64166:d0e9febfa00a 3.1

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Merged revisions 84172 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r84172 | martin.v.loewis | 2010-08-18 18:12:23 +0200 (Mi, 18 Aug 2010) | 2 lines Restore GIL in nis_cat in case of error. ........
author Martin v. Löwis <martin@v.loewis.de>
date Thu, 19 Aug 2010 09:03:03 +0000
parents f197407bdba2
children 3c9232a684ae
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rev   line source
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1 /* File object implementation (what's left of it -- see io.py) */
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2
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3 #define PY_SSIZE_T_CLEAN
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4 #include "Python.h"
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5
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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
51cc82605d32 SF bug [#460467] file objects should be subclassable.
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28 PyObject *
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29 PyFile_FromFd(int fd, char *name, char *mode, int buffering, char *encoding,
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30 char *errors, char *newline, int closefd)
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31 {
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32 PyObject *io, *stream, *nameobj = NULL;
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33
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34 io = PyImport_ImportModule("io");
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35 if (io == NULL)
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36 return NULL;
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37 stream = PyObject_CallMethod(io, "open", "isisssi", fd, mode,
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38 buffering, encoding, errors,
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39 newline, closefd);
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40 Py_DECREF(io);
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41 if (stream == NULL)
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42 return NULL;
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43 if (name != NULL) {
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44 nameobj = PyUnicode_FromString(name);
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45 if (nameobj == NULL)
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46 PyErr_Clear();
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47 else {
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48 if (PyObject_SetAttrString(stream, "name", nameobj) < 0)
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49 PyErr_Clear();
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50 Py_DECREF(nameobj);
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51 }
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52 }
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53 return stream;
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54 }
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55
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56 PyObject *
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57 PyFile_GetLine(PyObject *f, int n)
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58 {
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59 PyObject *result;
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60
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61 if (f == NULL) {
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62 PyErr_BadInternalCall();
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63 return NULL;
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64 }
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65
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66 {
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67 PyObject *reader;
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68 PyObject *args;
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69
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70 reader = PyObject_GetAttrString(f, "readline");
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71 if (reader == NULL)
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72 return NULL;
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73 if (n <= 0)
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74 args = PyTuple_New(0);
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75 else
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76 args = Py_BuildValue("(i)", n);
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77 if (args == NULL) {
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78 Py_DECREF(reader);
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79 return NULL;
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80 }
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81 result = PyEval_CallObject(reader, args);
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82 Py_DECREF(reader);
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83 Py_DECREF(args);
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84 if (result != NULL && !PyBytes_Check(result) &&
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85 !PyUnicode_Check(result)) {
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86 Py_DECREF(result);
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87 result = NULL;
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88 PyErr_SetString(PyExc_TypeError,
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89 "object.readline() returned non-string");
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90 }
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91 }
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92
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93 if (n < 0 && result != NULL && PyBytes_Check(result)) {
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94 char *s = PyBytes_AS_STRING(result);
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95 Py_ssize_t len = PyBytes_GET_SIZE(result);
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96 if (len == 0) {
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97 Py_DECREF(result);
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98 result = NULL;
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99 PyErr_SetString(PyExc_EOFError,
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100 "EOF when reading a line");
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101 }
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102 else if (s[len-1] == '\n') {
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103 if (result->ob_refcnt == 1)
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104 _PyBytes_Resize(&result, len-1);
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105 else {
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106 PyObject *v;
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107 v = PyBytes_FromStringAndSize(s, len-1);
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108 Py_DECREF(result);
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109 result = v;
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110 }
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111 }
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112 }
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113 if (n < 0 && result != NULL && PyUnicode_Check(result)) {
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114 Py_UNICODE *s = PyUnicode_AS_UNICODE(result);
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115 Py_ssize_t len = PyUnicode_GET_SIZE(result);
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116 if (len == 0) {
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117 Py_DECREF(result);
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118 result = NULL;
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119 PyErr_SetString(PyExc_EOFError,
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120 "EOF when reading a line");
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121 }
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122 else if (s[len-1] == '\n') {
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123 if (result->ob_refcnt == 1)
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124 PyUnicode_Resize(&result, len-1);
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125 else {
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126 PyObject *v;
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127 v = PyUnicode_FromUnicode(s, len-1);
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128 Py_DECREF(result);
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129 result = v;
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130 }
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131 }
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132 }
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133 return result;
183
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134 }
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135
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136 /* Interfaces to write objects/strings to file-like objects */
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137
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138 int
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139 PyFile_WriteObject(PyObject *v, PyObject *f, int flags)
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140 {
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141 PyObject *writer, *value, *args, *result;
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142 if (f == NULL) {
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143 PyErr_SetString(PyExc_TypeError, "writeobject with NULL file");
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144 return -1;
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145 }
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146 writer = PyObject_GetAttrString(f, "write");
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147 if (writer == NULL)
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148 return -1;
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149 if (flags & Py_PRINT_RAW) {
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150 value = PyObject_Str(v);
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151 }
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152 else
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153 value = PyObject_Repr(v);
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154 if (value == NULL) {
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155 Py_DECREF(writer);
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156 return -1;
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157 }
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158 args = PyTuple_Pack(1, value);
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159 if (args == NULL) {
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160 Py_DECREF(value);
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161 Py_DECREF(writer);
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162 return -1;
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163 }
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164 result = PyEval_CallObject(writer, args);
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165 Py_DECREF(args);
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166 Py_DECREF(value);
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167 Py_DECREF(writer);
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168 if (result == NULL)
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169 return -1;
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170 Py_DECREF(result);
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171 return 0;
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172 }
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173
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174 int
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175 PyFile_WriteString(const char *s, PyObject *f)
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176 {
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177 if (f == NULL) {
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178 /* Should be caused by a pre-existing error */
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179 if (!PyErr_Occurred())
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180 PyErr_SetString(PyExc_SystemError,
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181 "null file for PyFile_WriteString");
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182 return -1;
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183 }
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184 else if (!PyErr_Occurred()) {
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185 PyObject *v = PyUnicode_FromString(s);
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186 int err;
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187 if (v == NULL)
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188 return -1;
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189 err = PyFile_WriteObject(v, f, Py_PRINT_RAW);
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190 Py_DECREF(v);
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191 return err;
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192 }
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193 else
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194 return -1;
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195 }
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196
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197 /* Try to get a file-descriptor from a Python object. If the object
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198 is an integer or long integer, its value is returned. If not, the
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199 object's fileno() method is called if it exists; the method must return
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200 an integer or long integer, which is returned as the file descriptor value.
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201 -1 is returned on failure.
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202 */
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203
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204 int
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205 PyObject_AsFileDescriptor(PyObject *o)
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206 {
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207 int fd;
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208 PyObject *meth;
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209
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210 if (PyLong_Check(o)) {
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211 fd = PyLong_AsLong(o);
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212 }
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213 else if ((meth = PyObject_GetAttrString(o, "fileno")) != NULL)
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214 {
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215 PyObject *fno = PyEval_CallObject(meth, NULL);
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216 Py_DECREF(meth);
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217 if (fno == NULL)
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218 return -1;
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219
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220 if (PyLong_Check(fno)) {
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221 fd = PyLong_AsLong(fno);
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222 Py_DECREF(fno);
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223 }
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224 else {
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225 PyErr_SetString(PyExc_TypeError,
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226 "fileno() returned a non-integer");
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227 Py_DECREF(fno);
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228 return -1;
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229 }
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230 }
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231 else {
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232 PyErr_SetString(PyExc_TypeError,
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233 "argument must be an int, or have a fileno() method.");
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234 return -1;
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235 }
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236
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237 if (fd == -1 && PyErr_Occurred())
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238 return -1;
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239 if (fd < 0) {
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240 PyErr_Format(PyExc_ValueError,
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241 "file descriptor cannot be a negative integer (%i)",
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242 fd);
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243 return -1;
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244 }
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245 return fd;
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246 }
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247
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248 /*
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249 ** Py_UniversalNewlineFgets is an fgets variation that understands
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250 ** all of \r, \n and \r\n conventions.
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251 ** The stream should be opened in binary mode.
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252 ** If fobj is NULL the routine always does newline conversion, and
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253 ** it may peek one char ahead to gobble the second char in \r\n.
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254 ** If fobj is non-NULL it must be a PyFileObject. In this case there
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255 ** is no readahead but in stead a flag is used to skip a following
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256 ** \n on the next read. Also, if the file is open in binary mode
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257 ** the whole conversion is skipped. Finally, the routine keeps track of
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258 ** the different types of newlines seen.
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259 ** Note that we need no error handling: fgets() treats error and eof
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260 ** identically.
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261 */
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262 char *
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263 Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
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264 {
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265 char *p = buf;
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266 int c;
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267 int newlinetypes = 0;
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268 int skipnextlf = 0;
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269
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270 if (fobj) {
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271 errno = ENXIO; /* What can you do... */
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272 return NULL;
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273 }
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274 FLOCKFILE(stream);
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275 c = 'x'; /* Shut up gcc warning */
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276 while (--n > 0 && (c = GETC(stream)) != EOF ) {
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277 if (skipnextlf ) {
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278 skipnextlf = 0;
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279 if (c == '\n') {
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280 /* Seeing a \n here with skipnextlf true
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281 ** means we saw a \r before.
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282 */
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283 newlinetypes |= NEWLINE_CRLF;
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284 c = GETC(stream);
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285 if (c == EOF) break;
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286 } else {
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287 /*
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288 ** Note that c == EOF also brings us here,
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289 ** so we're okay if the last char in the file
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290 ** is a CR.
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291 */
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292 newlinetypes |= NEWLINE_CR;
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293 }
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294 }
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295 if (c == '\r') {
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296 /* A \r is translated into a \n, and we skip
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297 ** an adjacent \n, if any. We don't set the
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298 ** newlinetypes flag until we've seen the next char.
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299 */
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300 skipnextlf = 1;
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301 c = '\n';
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302 } else if ( c == '\n') {
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303 newlinetypes |= NEWLINE_LF;
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304 }
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305 *p++ = c;
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306 if (c == '\n') break;
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307 }
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308 if ( c == EOF && skipnextlf )
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309 newlinetypes |= NEWLINE_CR;
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310 FUNLOCKFILE(stream);
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311 *p = '\0';
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312 if ( skipnextlf ) {
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313 /* If we have no file object we cannot save the
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314 ** skipnextlf flag. We have to readahead, which
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315 ** will cause a pause if we're reading from an
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316 ** interactive stream, but that is very unlikely
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317 ** unless we're doing something silly like
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318 ** exec(open("/dev/tty").read()).
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319 */
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320 c = GETC(stream);
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321 if ( c != '\n' )
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322 ungetc(c, stream);
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323 }
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324 if (p == buf)
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325 return NULL;
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326 return buf;
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327 }
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328
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329 /* **************************** std printer ****************************
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330 * The stdprinter is used during the boot strapping phase as a preliminary
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331 * file like object for sys.stderr.
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332 */
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333
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334 typedef struct {
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335 PyObject_HEAD
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336 int fd;
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337 } PyStdPrinter_Object;
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338
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339 static PyObject *
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340 stdprinter_new(PyTypeObject *type, PyObject *args, PyObject *kews)
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341 {
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342 PyStdPrinter_Object *self;
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343
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344 assert(type != NULL && type->tp_alloc != NULL);
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345
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346 self = (PyStdPrinter_Object *) type->tp_alloc(type, 0);
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347 if (self != NULL) {
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348 self->fd = -1;
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349 }
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350
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351 return (PyObject *) self;
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352 }
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353
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354 static int
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355 fileio_init(PyObject *self, PyObject *args, PyObject *kwds)
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356 {
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357 PyErr_SetString(PyExc_TypeError,
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358 "cannot create 'stderrprinter' instances");
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359 return -1;
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360 }
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361
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362 PyObject *
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363 PyFile_NewStdPrinter(int fd)
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364 {
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365 PyStdPrinter_Object *self;
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366
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367 if (fd != fileno(stdout) && fd != fileno(stderr)) {
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368 /* not enough infrastructure for PyErr_BadInternalCall() */
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369 return NULL;
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370 }
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371
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372 self = PyObject_New(PyStdPrinter_Object,
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373 &PyStdPrinter_Type);
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374 if (self != NULL) {
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375 self->fd = fd;
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376 }
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377 return (PyObject*)self;
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378 }
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379
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380 static PyObject *
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381 stdprinter_write(PyStdPrinter_Object *self, PyObject *args)
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382 {
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383 char *c;
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384 Py_ssize_t n;
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385
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386 if (self->fd < 0) {
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387 /* fd might be invalid on Windows
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388 * I can't raise an exception here. It may lead to an
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389 * unlimited recursion in the case stderr is invalid.
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390 */
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391 Py_RETURN_NONE;
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392 }
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393
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394 if (!PyArg_ParseTuple(args, "s", &c)) {
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395 return NULL;
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396 }
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397 n = strlen(c);
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398
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399 Py_BEGIN_ALLOW_THREADS
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400 errno = 0;
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401 n = write(self->fd, c, n);
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402 Py_END_ALLOW_THREADS
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403
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404 if (n < 0) {
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405 if (errno == EAGAIN)
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406 Py_RETURN_NONE;
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407 PyErr_SetFromErrno(PyExc_IOError);
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408 return NULL;
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409 }
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410
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411 return PyLong_FromSsize_t(n);
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412 }
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413
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414 static PyObject *
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415 stdprinter_fileno(PyStdPrinter_Object *self)
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416 {
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417 return PyLong_FromLong((long) self->fd);
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418 }
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419
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420 static PyObject *
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421 stdprinter_repr(PyStdPrinter_Object *self)
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422 {
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423 return PyUnicode_FromFormat("<stdprinter(fd=%d) object at 0x%x>",
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424 self->fd, self);
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425 }
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426
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427 static PyObject *
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428 stdprinter_noop(PyStdPrinter_Object *self)
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429 {
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430 Py_RETURN_NONE;
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431 }
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432
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433 static PyObject *
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434 stdprinter_isatty(PyStdPrinter_Object *self)
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435 {
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436 long res;
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437 if (self->fd < 0) {
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438 Py_RETURN_FALSE;
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439 }
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440
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441 Py_BEGIN_ALLOW_THREADS
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442 res = isatty(self->fd);
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443 Py_END_ALLOW_THREADS
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444
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445 return PyBool_FromLong(res);
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446 }
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447
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448 static PyMethodDef stdprinter_methods[] = {
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449 {"close", (PyCFunction)stdprinter_noop, METH_NOARGS, ""},
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450 {"flush", (PyCFunction)stdprinter_noop, METH_NOARGS, ""},
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451 {"fileno", (PyCFunction)stdprinter_fileno, METH_NOARGS, ""},
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452 {"isatty", (PyCFunction)stdprinter_isatty, METH_NOARGS, ""},
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453 {"write", (PyCFunction)stdprinter_write, METH_VARARGS, ""},
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454 {NULL, NULL} /*sentinel */
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455 };
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456
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457 static PyObject *
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458 get_closed(PyStdPrinter_Object *self, void *closure)
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459 {
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460 Py_INCREF(Py_False);
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461 return Py_False;
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462 }
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463
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464 static PyObject *
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465 get_mode(PyStdPrinter_Object *self, void *closure)
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466 {
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467 return PyUnicode_FromString("w");
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468 }
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469
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470 static PyObject *
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471 get_encoding(PyStdPrinter_Object *self, void *closure)
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472 {
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473 Py_RETURN_NONE;
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474 }
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475
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476 static PyGetSetDef stdprinter_getsetlist[] = {
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477 {"closed", (getter)get_closed, NULL, "True if the file is closed"},
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478 {"encoding", (getter)get_encoding, NULL, "Encoding of the file"},
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479 {"mode", (getter)get_mode, NULL, "String giving the file mode"},
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480 {0},
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481 };
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482
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483 PyTypeObject PyStdPrinter_Type = {
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484 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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485 "stderrprinter", /* tp_name */
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486 sizeof(PyStdPrinter_Object), /* tp_basicsize */
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487 0, /* tp_itemsize */
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488 /* methods */
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489 0, /* tp_dealloc */
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490 0, /* tp_print */
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491 0, /* tp_getattr */
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492 0, /* tp_setattr */
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493 0, /* tp_reserved */
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494 (reprfunc)stdprinter_repr, /* tp_repr */
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495 0, /* tp_as_number */
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496 0, /* tp_as_sequence */
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497 0, /* tp_as_mapping */
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498 0, /* tp_hash */
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499 0, /* tp_call */
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500 0, /* tp_str */
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501 PyObject_GenericGetAttr, /* tp_getattro */
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502 0, /* tp_setattro */
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503 0, /* tp_as_buffer */
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504 Py_TPFLAGS_DEFAULT, /* tp_flags */
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505 0, /* tp_doc */
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506 0, /* tp_traverse */
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507 0, /* tp_clear */
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508 0, /* tp_richcompare */
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509 0, /* tp_weaklistoffset */
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510 0, /* tp_iter */
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511 0, /* tp_iternext */
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512 stdprinter_methods, /* tp_methods */
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513 0, /* tp_members */
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514 stdprinter_getsetlist, /* tp_getset */
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515 0, /* tp_base */
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516 0, /* tp_dict */
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517 0, /* tp_descr_get */
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518 0, /* tp_descr_set */
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519 0, /* tp_dictoffset */
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520 fileio_init, /* tp_init */
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521 PyType_GenericAlloc, /* tp_alloc */
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522 stdprinter_new, /* tp_new */
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523 PyObject_Del, /* tp_free */
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524 };
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525
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526
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527 #ifdef __cplusplus
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528 }
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529 #endif