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annotate Modules/xxmodule.c @ 3720:b341def4eef8 legacy-trunk

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author Guido van Rossum <guido@python.org>
date Wed, 26 Jun 1996 19:30:01 +0000
parents dab34cbf8d7f
children d19338fd38eb
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Use this file as a template to start implementing a module that
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26 also declares objects types. All occurrences of 'xxo' should be changed
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27 to something reasonable for your objects. After that, all other
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28 occurrences of 'xx' should be changed to something reasonable for your
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29 module. If your module is named foo your sourcefile should be named
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30 foomodule.c.
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31
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32 You will probably want to delete all references to 'x_attr' and add
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33 your own types of attributes instead. Maybe you want to name your
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34 local variables other than 'self'. If your object type is needed in
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35 other files, you'll have to create a file "foobarobject.h"; see
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36 intobject.h for an example. */
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37
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38 /* Xxo objects */
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39
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40 #include "allobjects.h"
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41
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42 static object *ErrorObject;
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43
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44 typedef struct {
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45 OB_HEAD
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46 object *x_attr; /* Attributes dictionary */
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47 } xxoobject;
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48
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49 staticforward typeobject Xxotype;
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50
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51 #define is_xxoobject(v) ((v)->ob_type == &Xxotype)
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52
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53 static xxoobject *
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54 newxxoobject(arg)
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55 object *arg;
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56 {
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57 xxoobject *self;
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58 self = NEWOBJ(xxoobject, &Xxotype);
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59 if (self == NULL)
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60 return NULL;
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61 self->x_attr = NULL;
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62 return self;
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63 }
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64
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65 /* Xxo methods */
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66
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67 static void
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68 xxo_dealloc(self)
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69 xxoobject *self;
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70 {
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71 XDECREF(self->x_attr);
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72 DEL(self);
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73 }
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74
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75 static object *
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76 xxo_demo(self, args)
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77 xxoobject *self;
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78 object *args;
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79 {
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80 if (!getnoarg(args))
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81 return NULL;
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82 INCREF(None);
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83 return None;
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84 }
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85
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86 static struct methodlist xxo_methods[] = {
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87 {"demo", (method)xxo_demo},
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88 {NULL, NULL} /* sentinel */
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89 };
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90
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91 static object *
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92 xxo_getattr(self, name)
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93 xxoobject *self;
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94 char *name;
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95 {
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96 if (self->x_attr != NULL) {
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97 object *v = dictlookup(self->x_attr, name);
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98 if (v != NULL) {
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99 INCREF(v);
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100 return v;
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101 }
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102 }
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103 return findmethod(xxo_methods, (object *)self, name);
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104 }
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105
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106 static int
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107 xxo_setattr(self, name, v)
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108 xxoobject *self;
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109 char *name;
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110 object *v;
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111 {
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112 if (self->x_attr == NULL) {
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113 self->x_attr = newdictobject();
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114 if (self->x_attr == NULL)
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115 return -1;
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116 }
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117 if (v == NULL) {
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118 int rv = dictremove(self->x_attr, name);
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119 if (rv < 0)
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120 err_setstr(AttributeError,
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121 "delete non-existing xxo attribute");
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122 return rv;
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123 }
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124 else
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125 return dictinsert(self->x_attr, name, v);
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126 }
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127
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128 staticforward typeobject Xxotype = {
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129 OB_HEAD_INIT(&Typetype)
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130 0, /*ob_size*/
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131 "xxo", /*tp_name*/
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132 sizeof(xxoobject), /*tp_basicsize*/
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133 0, /*tp_itemsize*/
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134 /* methods */
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135 (destructor)xxo_dealloc, /*tp_dealloc*/
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136 0, /*tp_print*/
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137 (getattrfunc)xxo_getattr, /*tp_getattr*/
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138 (setattrfunc)xxo_setattr, /*tp_setattr*/
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139 0, /*tp_compare*/
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140 0, /*tp_repr*/
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141 0, /*tp_as_number*/
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142 0, /*tp_as_sequence*/
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143 0, /*tp_as_mapping*/
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144 0, /*tp_hash*/
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145 };
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146 /* --------------------------------------------------------------------- */
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147
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148 /* Function of two integers returning integer */
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149
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150 static object *
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151 xx_foo(self, args)
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152 object *self; /* Not used */
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153 object *args;
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154 {
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155 long i, j;
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156 long res;
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157 if (!getargs(args, "(ll)", &i, &j))
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158 return NULL;
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159 res = i+j; /* XXX Do something here */
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160 return newintobject(res);
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161 }
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162
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163
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164 /* Function of no arguments returning new xxo object */
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165
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166 static object *
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167 xx_new(self, args)
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168 object *self; /* Not used */
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169 object *args;
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170 {
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171 int i, j;
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172 xxoobject *rv;
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173
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174 if (!getnoarg(args))
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175 return NULL;
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176 rv = newxxoobject(args);
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177 if ( rv == NULL )
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178 return NULL;
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179 return (object *)rv;
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180 }
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181
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182
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183 /* List of functions defined in the module */
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184
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185 static struct methodlist xx_methods[] = {
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186 {"foo", xx_foo},
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187 {"new", xx_new},
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188 {NULL, NULL} /* sentinel */
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189 };
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190
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191
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192 /* Initialization function for the module (*must* be called initxx) */
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193
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194 void
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195 initxx()
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196 {
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197 object *m, *d;
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198
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199 /* Create the module and add the functions */
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200 m = initmodule("xx", xx_methods);
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201
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202 /* Add some symbolic constants to the module */
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203 d = getmoduledict(m);
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204 ErrorObject = newstringobject("xx.error");
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205 dictinsert(d, "error", ErrorObject);
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206
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207 /* Check for errors */
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208 if (err_occurred())
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209 fatal("can't initialize module xx");
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210 }