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annotate Modules/_ctypes/ctypes.h @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 92f7a460ff82
children e38335d4df91
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1 /*****************************************************************
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2 This file should be kept compatible with Python 2.3, see PEP 291.
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3 *****************************************************************/
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4
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5 #if defined (__SVR4) && defined (__sun)
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6 # include <alloca.h>
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7 #endif
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8
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9 #if (PY_VERSION_HEX < 0x02040000)
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10 #define PyDict_CheckExact(ob) (Py_TYPE(ob) == &PyDict_Type)
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11 #endif
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12
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13 #if (PY_VERSION_HEX < 0x02050000)
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14 typedef int Py_ssize_t;
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15 #define PyInt_FromSsize_t PyInt_FromLong
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16 #define PyNumber_AsSsize_t(ob, exc) PyInt_AsLong(ob)
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17 #define PyIndex_Check(ob) PyInt_Check(ob)
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18 typedef Py_ssize_t (*readbufferproc)(PyObject *, Py_ssize_t, void **);
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19 typedef Py_ssize_t (*writebufferproc)(PyObject *, Py_ssize_t, void **);
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20 typedef Py_ssize_t (*segcountproc)(PyObject *, Py_ssize_t *);
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21 typedef Py_ssize_t (*charbufferproc)(PyObject *, Py_ssize_t, char **);
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22 #endif
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23
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24 #if (PY_VERSION_HEX < 0x02060000)
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25 #define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
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26 #define PyVarObject_HEAD_INIT(type, size) \
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27 PyObject_HEAD_INIT(type) size,
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28 #define PyImport_ImportModuleNoBlock PyImport_ImportModule
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29 #define PyLong_FromSsize_t PyInt_FromLong
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30 #define Py_TPFLAGS_HAVE_NEWBUFFER 0
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31 #endif
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32
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33
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34 #ifndef MS_WIN32
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35 #define max(a, b) ((a) > (b) ? (a) : (b))
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36 #define min(a, b) ((a) < (b) ? (a) : (b))
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37
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38 #define PARAMFLAG_FIN 0x1
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39 #define PARAMFLAG_FOUT 0x2
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40 #define PARAMFLAG_FLCID 0x4
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41 #endif
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42
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43 /*
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44 Backwards compatibility:
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45 Python2.2 used LONG_LONG instead of PY_LONG_LONG
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46 */
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47 #if defined(HAVE_LONG_LONG) && !defined(PY_LONG_LONG)
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48 #define PY_LONG_LONG LONG_LONG
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49 #endif
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50
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51 typedef struct tagPyCArgObject PyCArgObject;
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52 typedef struct tagCDataObject CDataObject;
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53 typedef PyObject *(* GETFUNC)(void *, Py_ssize_t size);
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54 typedef PyObject *(* SETFUNC)(void *, PyObject *value, Py_ssize_t size);
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55 typedef PyCArgObject *(* PARAMFUNC)(CDataObject *obj);
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56
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57 /* A default buffer in CDataObject, which can be used for small C types. If
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58 this buffer is too small, PyMem_Malloc will be called to create a larger one,
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59 and this one is not used.
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60
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61 Making CDataObject a variable size object would be a better solution, but more
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62 difficult in the presence of CFuncPtrObject. Maybe later.
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63 */
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64 union value {
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65 char c[16];
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66 short s;
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67 int i;
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68 long l;
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69 float f;
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70 double d;
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71 #ifdef HAVE_LONG_LONG
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72 PY_LONG_LONG ll;
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73 #endif
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74 long double D;
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75 };
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76
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77 /*
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78 Hm. Are there CDataObject's which do not need the b_objects member? In
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79 this case we probably should introduce b_flags to mark it as present... If
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80 b_objects is not present/unused b_length is unneeded as well.
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81 */
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82
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83 struct tagCDataObject {
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84 PyObject_HEAD
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85 char *b_ptr; /* pointer to memory block */
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86 int b_needsfree; /* need _we_ free the memory? */
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87 CDataObject *b_base; /* pointer to base object or NULL */
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88 Py_ssize_t b_size; /* size of memory block in bytes */
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89 Py_ssize_t b_length; /* number of references we need */
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90 Py_ssize_t b_index; /* index of this object into base's
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91 b_object list */
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92 PyObject *b_objects; /* dictionary of references we need to keep, or Py_None */
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93 union value b_value;
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94 };
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95
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96 typedef struct {
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97 PyObject_VAR_HEAD
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98 ffi_closure *pcl; /* the C callable */
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99 ffi_cif cif;
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100 int flags;
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101 PyObject *converters;
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102 PyObject *callable;
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103 PyObject *restype;
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104 SETFUNC setfunc;
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105 ffi_type *ffi_restype;
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106 ffi_type *atypes[1];
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107 } CThunkObject;
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108 extern PyTypeObject CThunk_Type;
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109 #define CThunk_CheckExact(v) ((v)->ob_type == &CThunk_Type)
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110
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111 typedef struct {
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112 /* First part identical to tagCDataObject */
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113 PyObject_HEAD
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114 char *b_ptr; /* pointer to memory block */
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115 int b_needsfree; /* need _we_ free the memory? */
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116 CDataObject *b_base; /* pointer to base object or NULL */
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117 Py_ssize_t b_size; /* size of memory block in bytes */
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118 Py_ssize_t b_length; /* number of references we need */
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119 Py_ssize_t b_index; /* index of this object into base's
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120 b_object list */
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121 PyObject *b_objects; /* list of references we need to keep */
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122 union value b_value;
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123 /* end of tagCDataObject, additional fields follow */
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124
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125 CThunkObject *thunk;
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126 PyObject *callable;
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127
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128 /* These two fields will override the ones in the type's stgdict if
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129 they are set */
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130 PyObject *converters;
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131 PyObject *argtypes;
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132 PyObject *restype;
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133 PyObject *checker;
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134 PyObject *errcheck;
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135 #ifdef MS_WIN32
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136 int index;
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137 GUID *iid;
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138 #endif
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139 PyObject *paramflags;
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140 } CFuncPtrObject;
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141
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142 extern PyTypeObject StgDict_Type;
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143 #define StgDict_CheckExact(v) ((v)->ob_type == &StgDict_Type)
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144 #define StgDict_Check(v) PyObject_TypeCheck(v, &StgDict_Type)
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145
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146 extern int StructUnionType_update_stgdict(PyObject *fields, PyObject *type, int isStruct);
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147 extern int PyType_stginfo(PyTypeObject *self, Py_ssize_t *psize, Py_ssize_t *palign, Py_ssize_t *plength);
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148 extern int PyObject_stginfo(PyObject *self, Py_ssize_t *psize, Py_ssize_t *palign, Py_ssize_t *plength);
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149
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150
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151
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152 extern PyTypeObject CData_Type;
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153 #define CDataObject_CheckExact(v) ((v)->ob_type == &CData_Type)
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154 #define CDataObject_Check(v) PyObject_TypeCheck(v, &CData_Type)
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155
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156 extern PyTypeObject SimpleType_Type;
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157 #define SimpleTypeObject_CheckExact(v) ((v)->ob_type == &SimpleType_Type)
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158 #define SimpleTypeObject_Check(v) PyObject_TypeCheck(v, &SimpleType_Type)
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159
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160 extern PyTypeObject CField_Type;
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161 extern struct fielddesc *getentry(char *fmt);
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162
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163
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164 extern PyObject *
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165 CField_FromDesc(PyObject *desc, Py_ssize_t index,
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166 Py_ssize_t *pfield_size, int bitsize, int *pbitofs,
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167 Py_ssize_t *psize, Py_ssize_t *poffset, Py_ssize_t *palign,
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168 int pack, int is_big_endian);
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169
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170 extern PyObject *CData_AtAddress(PyObject *type, void *buf);
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171 extern PyObject *CData_FromBytes(PyObject *type, char *data, Py_ssize_t length);
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172
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173 extern PyTypeObject ArrayType_Type;
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174 extern PyTypeObject Array_Type;
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175 extern PyTypeObject PointerType_Type;
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176 extern PyTypeObject Pointer_Type;
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177 extern PyTypeObject CFuncPtr_Type;
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178 extern PyTypeObject CFuncPtrType_Type;
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179 extern PyTypeObject StructType_Type;
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180
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181 #define ArrayTypeObject_Check(v) PyObject_TypeCheck(v, &ArrayType_Type)
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182 #define ArrayObject_Check(v) PyObject_TypeCheck(v, &Array_Type)
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183 #define PointerObject_Check(v) PyObject_TypeCheck(v, &Pointer_Type)
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184 #define PointerTypeObject_Check(v) PyObject_TypeCheck(v, &PointerType_Type)
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185 #define CFuncPtrObject_Check(v) PyObject_TypeCheck(v, &CFuncPtr_Type)
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186 #define CFuncPtrTypeObject_Check(v) PyObject_TypeCheck(v, &CFuncPtrType_Type)
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187 #define StructTypeObject_Check(v) PyObject_TypeCheck(v, &StructType_Type)
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188
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189 extern PyObject *
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190 CreateArrayType(PyObject *itemtype, Py_ssize_t length);
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191
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192 extern PyMethodDef module_methods[];
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193
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194 extern CThunkObject *AllocFunctionCallback(PyObject *callable,
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195 PyObject *converters,
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196 PyObject *restype,
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197 int flags);
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198 /* a table entry describing a predefined ctypes type */
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199 struct fielddesc {
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200 char code;
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201 SETFUNC setfunc;
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202 GETFUNC getfunc;
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203 ffi_type *pffi_type; /* always statically allocated */
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204 SETFUNC setfunc_swapped;
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205 GETFUNC getfunc_swapped;
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206 };
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207
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208 typedef struct {
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209 PyObject_HEAD
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210 Py_ssize_t offset;
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211 Py_ssize_t size;
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212 Py_ssize_t index; /* Index into CDataObject's
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213 object array */
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214 PyObject *proto; /* a type or NULL */
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215 GETFUNC getfunc; /* getter function if proto is NULL */
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216 SETFUNC setfunc; /* setter function if proto is NULL */
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217 int anonymous;
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218 } CFieldObject;
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219
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220 /* A subclass of PyDictObject, used as the instance dictionary of ctypes
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221 metatypes */
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222 typedef struct {
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223 PyDictObject dict; /* first part identical to PyDictObject */
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224 /* The size and align fields are unneeded, they are in ffi_type as well. As
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225 an experiment shows, it's trivial to get rid of them, the only thing to
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226 remember is that in ArrayType_new the ffi_type fields must be filled in -
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227 so far it was unneeded because libffi doesn't support arrays at all
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228 (because they are passed as pointers to function calls anyway). But it's
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229 too much risk to change that now, and there are other fields which doen't
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230 belong into this structure anyway. Maybe in ctypes 2.0... (ctypes 2000?)
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231 */
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232 Py_ssize_t size; /* number of bytes */
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233 Py_ssize_t align; /* alignment requirements */
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234 Py_ssize_t length; /* number of fields */
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235 ffi_type ffi_type_pointer;
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236 PyObject *proto; /* Only for Pointer/ArrayObject */
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237 SETFUNC setfunc; /* Only for simple objects */
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238 GETFUNC getfunc; /* Only for simple objects */
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239 PARAMFUNC paramfunc;
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240
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241 /* Following fields only used by CFuncPtrType_Type instances */
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242 PyObject *argtypes; /* tuple of CDataObjects */
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243 PyObject *converters; /* tuple([t.from_param for t in argtypes]) */
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244 PyObject *restype; /* CDataObject or NULL */
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245 PyObject *checker;
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246 int flags; /* calling convention and such */
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247
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248 /* pep3118 fields, pointers neeed PyMem_Free */
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249 char *format;
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250 int ndim;
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251 Py_ssize_t *shape;
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252 /* Py_ssize_t *strides; */ /* unused in ctypes */
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253 /* Py_ssize_t *suboffsets; */ /* unused in ctypes */
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254
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255 } StgDictObject;
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256
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257 /****************************************************************
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258 StgDictObject fields
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259
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260 setfunc and getfunc is only set for simple data types, it is copied from the
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261 corresponding fielddesc entry. These are functions to set and get the value
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262 in a memory block.
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263 They should probably by used by other types as well.
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264
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265 proto is only used for Pointer and Array types - it points to the item type
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266 object.
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267
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268 Probably all the magic ctypes methods (like from_param) should have C
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269 callable wrappers in the StgDictObject. For simple data type, for example,
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270 the fielddesc table could have entries for C codec from_param functions or
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271 other methods as well, if a subtype overrides this method in Python at
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272 construction time, or assigns to it later, tp_setattro should update the
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273 StgDictObject function to a generic one.
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274
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275 Currently, CFuncPtr types have 'converters' and 'checker' entries in their
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276 type dict. They are only used to cache attributes from other entries, whihc
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277 is wrong.
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278
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279 One use case is the .value attribute that all simple types have. But some
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280 complex structures, like VARIANT, represent a single value also, and should
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281 have this attribute.
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282
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283 Another use case is a _check_retval_ function, which is called when a ctypes
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284 type is used as return type of a function to validate and compute the return
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285 value.
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286
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287 Common ctypes protocol:
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288
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289 - setfunc: store a python value in a memory block
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290 - getfunc: convert data from a memory block into a python value
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291
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292 - checkfunc: validate and convert a return value from a function call
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293 - toparamfunc: convert a python value into a function argument
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294
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295 *****************************************************************/
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296
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297 /* May return NULL, but does not set an exception! */
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298 extern StgDictObject *PyType_stgdict(PyObject *obj);
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299
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300 /* May return NULL, but does not set an exception! */
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301 extern StgDictObject *PyObject_stgdict(PyObject *self);
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302
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303 extern int StgDict_clone(StgDictObject *src, StgDictObject *dst);
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304
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305 typedef int(* PPROC)(void);
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306
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307 PyObject *_CallProc(PPROC pProc,
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308 PyObject *arguments,
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309 #ifdef MS_WIN32
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310 IUnknown *pIUnk,
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311 GUID *iid,
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312 #endif
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313 int flags,
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314 PyObject *argtypes,
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315 PyObject *restype,
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316 PyObject *checker);
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317
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318
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319 #define FUNCFLAG_STDCALL 0x0
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320 #define FUNCFLAG_CDECL 0x1
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321 #define FUNCFLAG_HRESULT 0x2
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322 #define FUNCFLAG_PYTHONAPI 0x4
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323 #define FUNCFLAG_USE_ERRNO 0x8
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324 #define FUNCFLAG_USE_LASTERROR 0x10
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325
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326 #define TYPEFLAG_ISPOINTER 0x100
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327 #define TYPEFLAG_HASPOINTER 0x200
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328
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329 #define DICTFLAG_FINAL 0x1000
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330
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331 struct tagPyCArgObject {
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332 PyObject_HEAD
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333 ffi_type *pffi_type;
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334 char tag;
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335 union {
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336 char c;
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337 char b;
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338 short h;
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339 int i;
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340 long l;
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341 #ifdef HAVE_LONG_LONG
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342 PY_LONG_LONG q;
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343 #endif
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344 long double D;
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345 double d;
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346 float f;
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347 void *p;
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348 } value;
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349 PyObject *obj;
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350 Py_ssize_t size; /* for the 'V' tag */
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351 };
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352
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353 extern PyTypeObject PyCArg_Type;
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354 #define PyCArg_CheckExact(v) ((v)->ob_type == &PyCArg_Type)
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355 extern PyCArgObject *new_CArgObject(void);
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356
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357 extern PyObject *
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358 CData_get(PyObject *type, GETFUNC getfunc, PyObject *src,
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359 Py_ssize_t index, Py_ssize_t size, char *ptr);
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360
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361 extern int
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362 CData_set(PyObject *dst, PyObject *type, SETFUNC setfunc, PyObject *value,
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363 Py_ssize_t index, Py_ssize_t size, char *ptr);
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364
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365 extern void Extend_Error_Info(PyObject *exc_class, char *fmt, ...);
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366
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367 struct basespec {
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368 CDataObject *base;
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369 Py_ssize_t index;
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370 char *adr;
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371 };
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372
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373 extern char basespec_string[];
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374
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375 extern ffi_type *GetType(PyObject *obj);
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376
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377 /* exception classes */
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378 extern PyObject *PyExc_ArgError;
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379
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380 extern char *conversion_mode_encoding;
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381 extern char *conversion_mode_errors;
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382
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383 /* Python 2.4 macros, which are not available in Python 2.3 */
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384
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385 #ifndef Py_CLEAR
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386 #define Py_CLEAR(op) \
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387 do { \
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388 if (op) { \
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389 PyObject *tmp = (PyObject *)(op); \
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390 (op) = NULL; \
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391 Py_DECREF(tmp); \
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392 } \
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393 } while (0)
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394 #endif
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395
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396 #ifndef Py_VISIT
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397 /* Utility macro to help write tp_traverse functions.
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398 * To use this macro, the tp_traverse function must name its arguments
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399 * "visit" and "arg". This is intended to keep tp_traverse functions
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400 * looking as much alike as possible.
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401 */
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402 #define Py_VISIT(op) \
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403 do { \
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404 if (op) { \
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405 int vret = visit((op), arg); \
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406 if (vret) \
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407 return vret; \
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408 } \
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409 } while (0)
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410 #endif
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411
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412 /* Python's PyUnicode_*WideChar functions are broken ... */
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413 #if defined(Py_USING_UNICODE) && defined(HAVE_WCHAR_H)
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414 # define CTYPES_UNICODE
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415 #endif
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416
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417
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418 #ifdef CTYPES_UNICODE
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419 # undef PyUnicode_FromWideChar
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420 # define PyUnicode_FromWideChar My_PyUnicode_FromWideChar
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421
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422 # undef PyUnicode_AsWideChar
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423 # define PyUnicode_AsWideChar My_PyUnicode_AsWideChar
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424
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425 extern PyObject *My_PyUnicode_FromWideChar(const wchar_t *, Py_ssize_t);
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426 extern Py_ssize_t My_PyUnicode_AsWideChar(PyUnicodeObject *, wchar_t *, Py_ssize_t);
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427
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428 #endif
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429
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430 extern void FreeClosure(void *);
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431 extern void *MallocClosure(void);
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432
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433 extern void _AddTraceback(char *, char *, int);
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434
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ff3024259d91 Integrate patch from Neal Norwitz. He writes:
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435 extern PyObject *CData_FromBaseObj(PyObject *type, PyObject *base, Py_ssize_t index, char *adr);
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436 extern char *alloc_format_string(const char *prefix, const char *suffix);
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437
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438 /* XXX better name needed! */
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439 extern int IsSimpleSubType(PyObject *obj);
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440
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441 extern PyObject *_pointer_type_cache;
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442 PyObject *get_error_object(int **pspace);
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443
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444 #ifdef MS_WIN32
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445 extern PyObject *ComError;
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446 #endif
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447
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448 /*
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449 Local Variables:
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450 compile-command: "python setup.py -q build install --home ~"
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451 End:
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452 */