Mercurial > cpython-lru_cache-weakref

annotate Python/modsupport.c @ 72519:204d9391889a

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modsupport.c reuses Py_UNICODE_strlen()
author Victor Stinner <victor.stinner@haypocalc.com>
date Thu, 29 Sep 2011 04:01:43 +0200
parents 2d6d75eaf98c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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853b736a6a9e Added copyright notice.
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1
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2 /* Module support implementation */
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3
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4 #include "Python.h"
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5
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6 #define FLAG_SIZE_T 1
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7 typedef double va_double;
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8
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9 static PyObject *va_build_value(const char *, va_list, int);
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10
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11 /* Package context -- the full module name for package imports */
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12 char *_Py_PackageContext = NULL;
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13
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14 /* Helper for mkvalue() to scan the length of a format */
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15
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16 static int
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17 countformat(const char *format, int endchar)
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18 {
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19 int count = 0;
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20 int level = 0;
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21 while (level > 0 || *format != endchar) {
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22 switch (*format) {
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23 case '\0':
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24 /* Premature end */
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25 PyErr_SetString(PyExc_SystemError,
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26 "unmatched paren in format");
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27 return -1;
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28 case '(':
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29 case '[':
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30 case '{':
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31 if (level == 0)
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32 count++;
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33 level++;
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34 break;
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35 case ')':
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36 case ']':
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37 case '}':
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38 level--;
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39 break;
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40 case '#':
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41 case '&':
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42 case ',':
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43 case ':':
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44 case ' ':
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45 case '\t':
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46 break;
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47 default:
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48 if (level == 0)
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49 count++;
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50 }
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51 format++;
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52 }
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53 return count;
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54 }
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55
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56
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57 /* Generic function to create a value -- the inverse of getargs() */
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58 /* After an original idea and first implementation by Steven Miale */
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59
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60 static PyObject *do_mktuple(const char**, va_list *, int, int, int);
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61 static PyObject *do_mklist(const char**, va_list *, int, int, int);
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62 static PyObject *do_mkdict(const char**, va_list *, int, int, int);
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63 static PyObject *do_mkvalue(const char**, va_list *, int);
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64
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66 static PyObject *
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67 do_mkdict(const char **p_format, va_list *p_va, int endchar, int n, int flags)
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68 {
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69 PyObject *d;
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70 int i;
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71 int itemfailed = 0;
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72 if (n < 0)
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73 return NULL;
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74 if ((d = PyDict_New()) == NULL)
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75 return NULL;
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76 /* Note that we can't bail immediately on error as this will leak
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77 refcounts on any 'N' arguments. */
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78 for (i = 0; i < n; i+= 2) {
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79 PyObject *k, *v;
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80 int err;
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81 k = do_mkvalue(p_format, p_va, flags);
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82 if (k == NULL) {
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83 itemfailed = 1;
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84 Py_INCREF(Py_None);
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85 k = Py_None;
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86 }
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87 v = do_mkvalue(p_format, p_va, flags);
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88 if (v == NULL) {
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89 itemfailed = 1;
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90 Py_INCREF(Py_None);
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91 v = Py_None;
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92 }
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93 err = PyDict_SetItem(d, k, v);
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94 Py_DECREF(k);
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95 Py_DECREF(v);
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96 if (err < 0 || itemfailed) {
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97 Py_DECREF(d);
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98 return NULL;
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99 }
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100 }
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101 if (d != NULL && **p_format != endchar) {
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102 Py_DECREF(d);
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103 d = NULL;
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104 PyErr_SetString(PyExc_SystemError,
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105 "Unmatched paren in format");
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106 }
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107 else if (endchar)
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108 ++*p_format;
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109 return d;
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110 }
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111
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112 static PyObject *
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113 do_mklist(const char **p_format, va_list *p_va, int endchar, int n, int flags)
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114 {
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115 PyObject *v;
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116 int i;
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117 int itemfailed = 0;
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118 if (n < 0)
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119 return NULL;
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120 v = PyList_New(n);
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121 if (v == NULL)
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122 return NULL;
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123 /* Note that we can't bail immediately on error as this will leak
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124 refcounts on any 'N' arguments. */
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125 for (i = 0; i < n; i++) {
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126 PyObject *w = do_mkvalue(p_format, p_va, flags);
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127 if (w == NULL) {
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128 itemfailed = 1;
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129 Py_INCREF(Py_None);
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130 w = Py_None;
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131 }
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132 PyList_SET_ITEM(v, i, w);
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133 }
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134
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135 if (itemfailed) {
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136 /* do_mkvalue() should have already set an error */
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137 Py_DECREF(v);
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138 return NULL;
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139 }
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140 if (**p_format != endchar) {
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141 Py_DECREF(v);
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142 PyErr_SetString(PyExc_SystemError,
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143 "Unmatched paren in format");
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144 return NULL;
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145 }
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146 if (endchar)
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147 ++*p_format;
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148 return v;
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149 }
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150
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151 static PyObject *
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152 do_mktuple(const char **p_format, va_list *p_va, int endchar, int n, int flags)
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153 {
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154 PyObject *v;
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155 int i;
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156 int itemfailed = 0;
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157 if (n < 0)
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158 return NULL;
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159 if ((v = PyTuple_New(n)) == NULL)
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160 return NULL;
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161 /* Note that we can't bail immediately on error as this will leak
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162 refcounts on any 'N' arguments. */
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163 for (i = 0; i < n; i++) {
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164 PyObject *w = do_mkvalue(p_format, p_va, flags);
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165 if (w == NULL) {
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166 itemfailed = 1;
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167 Py_INCREF(Py_None);
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168 w = Py_None;
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169 }
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170 PyTuple_SET_ITEM(v, i, w);
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171 }
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172 if (itemfailed) {
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173 /* do_mkvalue() should have already set an error */
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174 Py_DECREF(v);
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175 return NULL;
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176 }
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177 if (**p_format != endchar) {
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178 Py_DECREF(v);
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179 PyErr_SetString(PyExc_SystemError,
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180 "Unmatched paren in format");
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181 return NULL;
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182 }
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183 if (endchar)
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184 ++*p_format;
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185 return v;
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186 }
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187
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188 static PyObject *
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189 do_mkvalue(const char **p_format, va_list *p_va, int flags)
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190 {
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191 for (;;) {
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192 switch (*(*p_format)++) {
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193 case '(':
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194 return do_mktuple(p_format, p_va, ')',
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195 countformat(*p_format, ')'), flags);
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196
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197 case '[':
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198 return do_mklist(p_format, p_va, ']',
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199 countformat(*p_format, ']'), flags);
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200
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201 case '{':
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202 return do_mkdict(p_format, p_va, '}',
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203 countformat(*p_format, '}'), flags);
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204
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205 case 'b':
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206 case 'B':
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207 case 'h':
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208 case 'i':
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209 return PyLong_FromLong((long)va_arg(*p_va, int));
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210
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211 case 'H':
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212 return PyLong_FromLong((long)va_arg(*p_va, unsigned int));
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213
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214 case 'I':
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215 {
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216 unsigned int n;
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217 n = va_arg(*p_va, unsigned int);
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218 return PyLong_FromUnsignedLong(n);
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219 }
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220
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221 case 'n':
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222 #if SIZEOF_SIZE_T!=SIZEOF_LONG
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223 return PyLong_FromSsize_t(va_arg(*p_va, Py_ssize_t));
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224 #endif
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225 /* Fall through from 'n' to 'l' if Py_ssize_t is long */
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226 case 'l':
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227 return PyLong_FromLong(va_arg(*p_va, long));
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228
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229 case 'k':
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230 {
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231 unsigned long n;
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232 n = va_arg(*p_va, unsigned long);
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233 return PyLong_FromUnsignedLong(n);
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234 }
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235
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236 #ifdef HAVE_LONG_LONG
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237 case 'L':
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238 return PyLong_FromLongLong((PY_LONG_LONG)va_arg(*p_va, PY_LONG_LONG));
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239
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240 case 'K':
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241 return PyLong_FromUnsignedLongLong((PY_LONG_LONG)va_arg(*p_va, unsigned PY_LONG_LONG));
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242 #endif
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243 case 'u':
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244 {
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245 PyObject *v;
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246 Py_UNICODE *u = va_arg(*p_va, Py_UNICODE *);
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247 Py_ssize_t n;
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248 if (**p_format == '#') {
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249 ++*p_format;
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250 if (flags & FLAG_SIZE_T)
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251 n = va_arg(*p_va, Py_ssize_t);
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252 else
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253 n = va_arg(*p_va, int);
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254 }
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255 else
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256 n = -1;
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257 if (u == NULL) {
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258 v = Py_None;
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259 Py_INCREF(v);
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260 }
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261 else {
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262 if (n < 0)
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263 n = Py_UNICODE_strlen(u);
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264 v = PyUnicode_FromUnicode(u, n);
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265 }
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266 return v;
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267 }
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268 case 'f':
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269 case 'd':
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270 return PyFloat_FromDouble(
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271 (double)va_arg(*p_va, va_double));
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272
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273 case 'D':
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274 return PyComplex_FromCComplex(
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275 *((Py_complex *)va_arg(*p_va, Py_complex *)));
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276
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277 case 'c':
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278 {
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279 char p[1];
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280 p[0] = (char)va_arg(*p_va, int);
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281 return PyBytes_FromStringAndSize(p, 1);
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282 }
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283 case 'C':
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284 {
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285 int i = va_arg(*p_va, int);
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286 return PyUnicode_FromOrdinal(i);
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287 }
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288
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289 case 's':
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290 case 'z':
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291 case 'U': /* XXX deprecated alias */
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292 {
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293 PyObject *v;
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294 char *str = va_arg(*p_va, char *);
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295 Py_ssize_t n;
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296 if (**p_format == '#') {
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297 ++*p_format;
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298 if (flags & FLAG_SIZE_T)
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299 n = va_arg(*p_va, Py_ssize_t);
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300 else
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301 n = va_arg(*p_va, int);
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302 }
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303 else
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304 n = -1;
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305 if (str == NULL) {
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306 v = Py_None;
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307 Py_INCREF(v);
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308 }
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309 else {
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310 if (n < 0) {
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311 size_t m = strlen(str);
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312 if (m > PY_SSIZE_T_MAX) {
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313 PyErr_SetString(PyExc_OverflowError,
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314 "string too long for Python string");
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315 return NULL;
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316 }
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317 n = (Py_ssize_t)m;
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318 }
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319 v = PyUnicode_FromStringAndSize(str, n);
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320 }
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321 return v;
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322 }
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323
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324 case 'y':
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325 {
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326 PyObject *v;
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327 char *str = va_arg(*p_va, char *);
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328 Py_ssize_t n;
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329 if (**p_format == '#') {
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330 ++*p_format;
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331 if (flags & FLAG_SIZE_T)
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332 n = va_arg(*p_va, Py_ssize_t);
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333 else
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334 n = va_arg(*p_va, int);
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335 }
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336 else
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337 n = -1;
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338 if (str == NULL) {
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339 v = Py_None;
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340 Py_INCREF(v);
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341 }
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342 else {
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343 if (n < 0) {
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344 size_t m = strlen(str);
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345 if (m > PY_SSIZE_T_MAX) {
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346 PyErr_SetString(PyExc_OverflowError,
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347 "string too long for Python bytes");
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348 return NULL;
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349 }
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350 n = (Py_ssize_t)m;
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351 }
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352 v = PyBytes_FromStringAndSize(str, n);
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353 }
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354 return v;
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355 }
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356
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357 case 'N':
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358 case 'S':
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359 case 'O':
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360 if (**p_format == '&') {
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361 typedef PyObject *(*converter)(void *);
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362 converter func = va_arg(*p_va, converter);
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363 void *arg = va_arg(*p_va, void *);
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364 ++*p_format;
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365 return (*func)(arg);
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366 }
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367 else {
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368 PyObject *v;
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369 v = va_arg(*p_va, PyObject *);
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370 if (v != NULL) {
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371 if (*(*p_format - 1) != 'N')
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372 Py_INCREF(v);
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373 }
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374 else if (!PyErr_Occurred())
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375 /* If a NULL was passed
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376 * because a call that should
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377 * have constructed a value
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378 * failed, that's OK, and we
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379 * pass the error on; but if
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380 * no error occurred it's not
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381 * clear that the caller knew
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382 * what she was doing. */
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383 PyErr_SetString(PyExc_SystemError,
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384 "NULL object passed to Py_BuildValue");
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385 return v;
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386 }
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387
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388 case ':':
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389 case ',':
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390 case ' ':
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391 case '\t':
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392 break;
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393
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394 default:
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395 PyErr_SetString(PyExc_SystemError,
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396 "bad format char passed to Py_BuildValue");
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397 return NULL;
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398
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399 }
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400 }
816
e4a27d84ea36 Added mkvalue() function
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401 }
e4a27d84ea36 Added mkvalue() function
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402
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403
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404 PyObject *
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405 Py_BuildValue(const char *format, ...)
816
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406 {
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407 va_list va;
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408 PyObject* retval;
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409 va_start(va, format);
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410 retval = va_build_value(format, va, 0);
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411 va_end(va);
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412 return retval;
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413 }
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414
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415 PyObject *
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416 _Py_BuildValue_SizeT(const char *format, ...)
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417 {
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418 va_list va;
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419 PyObject* retval;
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420 va_start(va, format);
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421 retval = va_build_value(format, va, FLAG_SIZE_T);
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422 va_end(va);
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423 return retval;
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424 }
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425
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426 PyObject *
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427 Py_VaBuildValue(const char *format, va_list va)
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428 {
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429 return va_build_value(format, va, 0);
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430 }
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431
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432 PyObject *
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433 _Py_VaBuildValue_SizeT(const char *format, va_list va)
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434 {
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435 return va_build_value(format, va, FLAG_SIZE_T);
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436 }
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437
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438 static PyObject *
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439 va_build_value(const char *format, va_list va, int flags)
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440 {
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441 const char *f = format;
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442 int n = countformat(f, '\0');
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443 va_list lva;
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444
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445 Py_VA_COPY(lva, va);
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446
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447 if (n < 0)
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448 return NULL;
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449 if (n == 0) {
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450 Py_INCREF(Py_None);
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451 return Py_None;
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452 }
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453 if (n == 1)
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454 return do_mkvalue(&f, &lva, flags);
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455 return do_mktuple(&f, &lva, '\0', n, flags);
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456 }
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457
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458
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459 PyObject *
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460 PyEval_CallFunction(PyObject *obj, const char *format, ...)
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461 {
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462 va_list vargs;
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463 PyObject *args;
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464 PyObject *res;
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465
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466 va_start(vargs, format);
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467
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468 args = Py_VaBuildValue(format, vargs);
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469 va_end(vargs);
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470
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471 if (args == NULL)
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472 return NULL;
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473
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474 res = PyEval_CallObject(obj, args);
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475 Py_DECREF(args);
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476
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477 return res;
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478 }
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479
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480
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481 PyObject *
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482 PyEval_CallMethod(PyObject *obj, const char *methodname, const char *format, ...)
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483 {
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484 va_list vargs;
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485 PyObject *meth;
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486 PyObject *args;
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487 PyObject *res;
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488
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489 meth = PyObject_GetAttrString(obj, methodname);
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490 if (meth == NULL)
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491 return NULL;
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492
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493 va_start(vargs, format);
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494
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495 args = Py_VaBuildValue(format, vargs);
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496 va_end(vargs);
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497
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498 if (args == NULL) {
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499 Py_DECREF(meth);
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500 return NULL;
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501 }
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502
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503 res = PyEval_CallObject(meth, args);
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504 Py_DECREF(meth);
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505 Py_DECREF(args);
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506
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507 return res;
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508 }
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509
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510 int
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511 PyModule_AddObject(PyObject *m, const char *name, PyObject *o)
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512 {
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513 PyObject *dict;
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514 if (!PyModule_Check(m)) {
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515 PyErr_SetString(PyExc_TypeError,
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516 "PyModule_AddObject() needs module as first arg");
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517 return -1;
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518 }
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519 if (!o) {
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520 if (!PyErr_Occurred())
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521 PyErr_SetString(PyExc_TypeError,
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522 "PyModule_AddObject() needs non-NULL value");
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523 return -1;
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524 }
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525
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526 dict = PyModule_GetDict(m);
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527 if (dict == NULL) {
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528 /* Internal error -- modules must have a dict! */
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529 PyErr_Format(PyExc_SystemError, "module '%s' has no __dict__",
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530 PyModule_GetName(m));
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531 return -1;
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532 }
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533 if (PyDict_SetItemString(dict, name, o))
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534 return -1;
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535 Py_DECREF(o);
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536 return 0;
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537 }
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538
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539 int
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540 PyModule_AddIntConstant(PyObject *m, const char *name, long value)
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541 {
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542 PyObject *o = PyLong_FromLong(value);
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543 if (!o)
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544 return -1;
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545 if (PyModule_AddObject(m, name, o) == 0)
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546 return 0;
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547 Py_DECREF(o);
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548 return -1;
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549 }
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550
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551 int
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552 PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)
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553 {
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554 PyObject *o = PyUnicode_FromString(value);
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555 if (!o)
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556 return -1;
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557 if (PyModule_AddObject(m, name, o) == 0)
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558 return 0;
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559 Py_DECREF(o);
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560 return -1;
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561 }