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annotate Include/stringobject.h @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 752e1abaf15a
children e38335d4df91 c5e0d9beebf9
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1
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2 /* String (str/bytes) object interface */
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3
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4 #ifndef Py_STRINGOBJECT_H
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5 #define Py_STRINGOBJECT_H
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6 #ifdef __cplusplus
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7 extern "C" {
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8 #endif
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9
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10 #include <stdarg.h>
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11
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12 /*
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13 Type PyStringObject represents a character string. An extra zero byte is
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14 reserved at the end to ensure it is zero-terminated, but a size is
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15 present so strings with null bytes in them can be represented. This
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16 is an immutable object type.
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17
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18 There are functions to create new string objects, to test
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19 an object for string-ness, and to get the
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20 string value. The latter function returns a null pointer
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21 if the object is not of the proper type.
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22 There is a variant that takes an explicit size as well as a
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23 variant that assumes a zero-terminated string. Note that none of the
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24 functions should be applied to nil objects.
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25 */
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26
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27 /* Caching the hash (ob_shash) saves recalculation of a string's hash value.
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28 Interning strings (ob_sstate) tries to ensure that only one string
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29 object with a given value exists, so equality tests can be one pointer
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30 comparison. This is generally restricted to strings that "look like"
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31 Python identifiers, although the intern() builtin can be used to force
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32 interning of any string.
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33 Together, these sped the interpreter by up to 20%. */
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34
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35 typedef struct {
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36 PyObject_VAR_HEAD
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37 long ob_shash;
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38 int ob_sstate;
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39 char ob_sval[1];
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40
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41 /* Invariants:
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42 * ob_sval contains space for 'ob_size+1' elements.
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43 * ob_sval[ob_size] == 0.
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44 * ob_shash is the hash of the string or -1 if not computed yet.
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45 * ob_sstate != 0 iff the string object is in stringobject.c's
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46 * 'interned' dictionary; in this case the two references
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47 * from 'interned' to this object are *not counted* in ob_refcnt.
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48 */
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49 } PyStringObject;
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50
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51 #define SSTATE_NOT_INTERNED 0
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52 #define SSTATE_INTERNED_MORTAL 1
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53 #define SSTATE_INTERNED_IMMORTAL 2
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54
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55 PyAPI_DATA(PyTypeObject) PyBaseString_Type;
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56 PyAPI_DATA(PyTypeObject) PyString_Type;
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57
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58 #define PyString_Check(op) \
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59 PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_STRING_SUBCLASS)
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60 #define PyString_CheckExact(op) (Py_TYPE(op) == &PyString_Type)
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61
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62 PyAPI_FUNC(PyObject *) PyString_FromStringAndSize(const char *, Py_ssize_t);
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63 PyAPI_FUNC(PyObject *) PyString_FromString(const char *);
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64 PyAPI_FUNC(PyObject *) PyString_FromFormatV(const char*, va_list)
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65 Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
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66 PyAPI_FUNC(PyObject *) PyString_FromFormat(const char*, ...)
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67 Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
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68 PyAPI_FUNC(Py_ssize_t) PyString_Size(PyObject *);
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69 PyAPI_FUNC(char *) PyString_AsString(PyObject *);
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70 PyAPI_FUNC(PyObject *) PyString_Repr(PyObject *, int);
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71 PyAPI_FUNC(void) PyString_Concat(PyObject **, PyObject *);
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72 PyAPI_FUNC(void) PyString_ConcatAndDel(PyObject **, PyObject *);
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73 PyAPI_FUNC(int) _PyString_Resize(PyObject **, Py_ssize_t);
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74 PyAPI_FUNC(int) _PyString_Eq(PyObject *, PyObject*);
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75 PyAPI_FUNC(PyObject *) PyString_Format(PyObject *, PyObject *);
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76 PyAPI_FUNC(PyObject *) _PyString_FormatLong(PyObject*, int, int,
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77 int, char**, int*);
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78 PyAPI_FUNC(PyObject *) PyString_DecodeEscape(const char *, Py_ssize_t,
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79 const char *, Py_ssize_t,
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80 const char *);
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81
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82 PyAPI_FUNC(void) PyString_InternInPlace(PyObject **);
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83 PyAPI_FUNC(void) PyString_InternImmortal(PyObject **);
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84 PyAPI_FUNC(PyObject *) PyString_InternFromString(const char *);
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85 PyAPI_FUNC(void) _Py_ReleaseInternedStrings(void);
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86
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87 /* Use only if you know it's a string */
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88 #define PyString_CHECK_INTERNED(op) (((PyStringObject *)(op))->ob_sstate)
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89
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90 /* Macro, trading safety for speed */
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91 #define PyString_AS_STRING(op) (((PyStringObject *)(op))->ob_sval)
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92 #define PyString_GET_SIZE(op) Py_SIZE(op)
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93
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94 /* _PyString_Join(sep, x) is like sep.join(x). sep must be PyStringObject*,
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95 x must be an iterable object. */
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96 PyAPI_FUNC(PyObject *) _PyString_Join(PyObject *sep, PyObject *x);
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97
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98 /* --- Generic Codecs ----------------------------------------------------- */
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99
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100 /* Create an object by decoding the encoded string s of the
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101 given size. */
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102
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103 PyAPI_FUNC(PyObject*) PyString_Decode(
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104 const char *s, /* encoded string */
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105 Py_ssize_t size, /* size of buffer */
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106 const char *encoding, /* encoding */
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107 const char *errors /* error handling */
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108 );
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109
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110 /* Encodes a char buffer of the given size and returns a
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111 Python object. */
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112
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113 PyAPI_FUNC(PyObject*) PyString_Encode(
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114 const char *s, /* string char buffer */
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115 Py_ssize_t size, /* number of chars to encode */
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116 const char *encoding, /* encoding */
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117 const char *errors /* error handling */
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118 );
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119
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120 /* Encodes a string object and returns the result as Python
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121 object. */
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122
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123 PyAPI_FUNC(PyObject*) PyString_AsEncodedObject(
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124 PyObject *str, /* string object */
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125 const char *encoding, /* encoding */
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126 const char *errors /* error handling */
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127 );
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128
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129 /* Encodes a string object and returns the result as Python string
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130 object.
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131
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132 If the codec returns an Unicode object, the object is converted
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133 back to a string using the default encoding.
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134
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135 DEPRECATED - use PyString_AsEncodedObject() instead. */
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136
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137 PyAPI_FUNC(PyObject*) PyString_AsEncodedString(
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138 PyObject *str, /* string object */
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139 const char *encoding, /* encoding */
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140 const char *errors /* error handling */
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141 );
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142
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143 /* Decodes a string object and returns the result as Python
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144 object. */
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145
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146 PyAPI_FUNC(PyObject*) PyString_AsDecodedObject(
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147 PyObject *str, /* string object */
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148 const char *encoding, /* encoding */
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149 const char *errors /* error handling */
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150 );
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151
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152 /* Decodes a string object and returns the result as Python string
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153 object.
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154
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155 If the codec returns an Unicode object, the object is converted
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156 back to a string using the default encoding.
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157
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158 DEPRECATED - use PyString_AsDecodedObject() instead. */
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159
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160 PyAPI_FUNC(PyObject*) PyString_AsDecodedString(
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161 PyObject *str, /* string object */
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162 const char *encoding, /* encoding */
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163 const char *errors /* error handling */
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164 );
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165
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166 /* Provides access to the internal data buffer and size of a string
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167 object or the default encoded version of an Unicode object. Passing
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168 NULL as *len parameter will force the string buffer to be
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169 0-terminated (passing a string with embedded NULL characters will
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170 cause an exception). */
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171
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172 PyAPI_FUNC(int) PyString_AsStringAndSize(
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173 register PyObject *obj, /* string or Unicode object */
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174 register char **s, /* pointer to buffer variable */
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175 register Py_ssize_t *len /* pointer to length variable or NULL
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176 (only possible for 0-terminated
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177 strings) */
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178 );
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179
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180 /* Using the current locale, insert the thousands grouping
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181 into the string pointed to by buffer. For the argument descriptions,
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182 see Objects/stringlib/localeutil.h */
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183
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184 PyAPI_FUNC(int) _PyString_InsertThousandsGrouping(char *buffer,
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185 Py_ssize_t n_buffer,
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186 Py_ssize_t n_digits,
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187 Py_ssize_t buf_size,
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188 Py_ssize_t *count,
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189 int append_zero_char);
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190
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191 /* Format the object based on the format_spec, as defined in PEP 3101
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192 (Advanced String Formatting). */
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193 PyAPI_FUNC(PyObject *) _PyBytes_FormatAdvanced(PyObject *obj,
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194 char *format_spec,
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195 Py_ssize_t format_spec_len);
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196
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197 #ifdef __cplusplus
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198 }
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199 #endif
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200 #endif /* !Py_STRINGOBJECT_H */