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annotate Modules/_dbmmodule.c @ 83447:678564fc0962 3.3

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#17789: test_random now works with unittest test discovery. Patch by Zachary Ware.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 19 Apr 2013 05:45:27 +0300
parents 8beaa9a37387
children 61ab0c6907f9 dea15868963f
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1
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2 /* DBM module using dictionary interface */
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4
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5 #define PY_SSIZE_T_CLEAN
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6 #include "Python.h"
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7
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8 #include <sys/types.h>
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9 #include <sys/stat.h>
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10 #include <fcntl.h>
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12 /* Some Linux systems install gdbm/ndbm.h, but not ndbm.h. This supports
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13 * whichever configure was able to locate.
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14 */
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15 #if defined(HAVE_NDBM_H)
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16 #include <ndbm.h>
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17 #if defined(PYOS_OS2) && !defined(PYCC_GCC)
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18 static char *which_dbm = "ndbm";
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19 #else
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20 static char *which_dbm = "GNU gdbm"; /* EMX port of GDBM */
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21 #endif
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22 #elif defined(HAVE_GDBM_NDBM_H)
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23 #include <gdbm/ndbm.h>
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24 static char *which_dbm = "GNU gdbm";
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25 #elif defined(HAVE_GDBM_DASH_NDBM_H)
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26 #include <gdbm-ndbm.h>
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27 static char *which_dbm = "GNU gdbm";
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28 #elif defined(HAVE_BERKDB_H)
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29 #include <db.h>
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30 static char *which_dbm = "Berkeley DB";
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31 #else
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32 #error "No ndbm.h available!"
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33 #endif
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34
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35 typedef struct {
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36 PyObject_HEAD
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37 int di_size; /* -1 means recompute */
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38 DBM *di_dbm;
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39 } dbmobject;
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40
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41 static PyTypeObject Dbmtype;
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42
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43 #define is_dbmobject(v) (Py_TYPE(v) == &Dbmtype)
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44 #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
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45 { PyErr_SetString(DbmError, "DBM object has already been closed"); \
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46 return NULL; }
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47
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48 static PyObject *DbmError;
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49
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50 static PyObject *
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51 newdbmobject(char *file, int flags, int mode)
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52 {
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53 dbmobject *dp;
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54
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55 dp = PyObject_New(dbmobject, &Dbmtype);
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56 if (dp == NULL)
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57 return NULL;
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58 dp->di_size = -1;
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59 if ( (dp->di_dbm = dbm_open(file, flags, mode)) == 0 ) {
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60 PyErr_SetFromErrno(DbmError);
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61 Py_DECREF(dp);
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62 return NULL;
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63 }
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64 return (PyObject *)dp;
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65 }
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66
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67 /* Methods */
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68
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69 static void
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70 dbm_dealloc(register dbmobject *dp)
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71 {
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72 if ( dp->di_dbm )
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73 dbm_close(dp->di_dbm);
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74 PyObject_Del(dp);
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75 }
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76
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77 static Py_ssize_t
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78 dbm_length(dbmobject *dp)
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79 {
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80 if (dp->di_dbm == NULL) {
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81 PyErr_SetString(DbmError, "DBM object has already been closed");
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82 return -1;
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83 }
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84 if ( dp->di_size < 0 ) {
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85 datum key;
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86 int size;
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87
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88 size = 0;
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89 for ( key=dbm_firstkey(dp->di_dbm); key.dptr;
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90 key = dbm_nextkey(dp->di_dbm))
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91 size++;
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92 dp->di_size = size;
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93 }
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94 return dp->di_size;
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95 }
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96
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97 static PyObject *
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98 dbm_subscript(dbmobject *dp, register PyObject *key)
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99 {
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100 datum drec, krec;
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101 Py_ssize_t tmp_size;
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102
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103 if (!PyArg_Parse(key, "s#", &krec.dptr, &tmp_size) )
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104 return NULL;
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105
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106 krec.dsize = tmp_size;
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107 check_dbmobject_open(dp);
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108 drec = dbm_fetch(dp->di_dbm, krec);
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109 if ( drec.dptr == 0 ) {
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110 PyErr_SetObject(PyExc_KeyError, key);
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111 return NULL;
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112 }
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113 if ( dbm_error(dp->di_dbm) ) {
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114 dbm_clearerr(dp->di_dbm);
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115 PyErr_SetString(DbmError, "");
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116 return NULL;
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117 }
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118 return PyBytes_FromStringAndSize(drec.dptr, drec.dsize);
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119 }
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120
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121 static int
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122 dbm_ass_sub(dbmobject *dp, PyObject *v, PyObject *w)
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123 {
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124 datum krec, drec;
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125 Py_ssize_t tmp_size;
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126
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127 if ( !PyArg_Parse(v, "s#", &krec.dptr, &tmp_size) ) {
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128 PyErr_SetString(PyExc_TypeError,
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129 "dbm mappings have bytes or string keys only");
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130 return -1;
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131 }
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132 krec.dsize = tmp_size;
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133 if (dp->di_dbm == NULL) {
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134 PyErr_SetString(DbmError, "DBM object has already been closed");
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135 return -1;
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136 }
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137 dp->di_size = -1;
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138 if (w == NULL) {
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139 if ( dbm_delete(dp->di_dbm, krec) < 0 ) {
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140 dbm_clearerr(dp->di_dbm);
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141 PyErr_SetObject(PyExc_KeyError, v);
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142 return -1;
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143 }
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144 } else {
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145 if ( !PyArg_Parse(w, "s#", &drec.dptr, &tmp_size) ) {
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146 PyErr_SetString(PyExc_TypeError,
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147 "dbm mappings have byte or string elements only");
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148 return -1;
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149 }
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150 drec.dsize = tmp_size;
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151 if ( dbm_store(dp->di_dbm, krec, drec, DBM_REPLACE) < 0 ) {
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152 dbm_clearerr(dp->di_dbm);
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153 PyErr_SetString(DbmError,
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154 "cannot add item to database");
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155 return -1;
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156 }
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157 }
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158 if ( dbm_error(dp->di_dbm) ) {
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159 dbm_clearerr(dp->di_dbm);
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160 PyErr_SetString(DbmError, "");
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161 return -1;
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162 }
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163 return 0;
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164 }
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165
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166 static PyMappingMethods dbm_as_mapping = {
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167 (lenfunc)dbm_length, /*mp_length*/
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168 (binaryfunc)dbm_subscript, /*mp_subscript*/
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169 (objobjargproc)dbm_ass_sub, /*mp_ass_subscript*/
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170 };
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171
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172 static PyObject *
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173 dbm__close(register dbmobject *dp, PyObject *unused)
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174 {
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175 if (dp->di_dbm)
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176 dbm_close(dp->di_dbm);
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177 dp->di_dbm = NULL;
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178 Py_INCREF(Py_None);
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179 return Py_None;
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180 }
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181
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182 static PyObject *
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183 dbm_keys(register dbmobject *dp, PyObject *unused)
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184 {
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185 register PyObject *v, *item;
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186 datum key;
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187 int err;
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188
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189 check_dbmobject_open(dp);
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190 v = PyList_New(0);
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191 if (v == NULL)
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192 return NULL;
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193 for (key = dbm_firstkey(dp->di_dbm); key.dptr;
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194 key = dbm_nextkey(dp->di_dbm)) {
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195 item = PyBytes_FromStringAndSize(key.dptr, key.dsize);
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196 if (item == NULL) {
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197 Py_DECREF(v);
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198 return NULL;
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199 }
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200 err = PyList_Append(v, item);
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201 Py_DECREF(item);
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202 if (err != 0) {
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203 Py_DECREF(v);
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204 return NULL;
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205 }
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206 }
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207 return v;
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208 }
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209
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210 static int
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211 dbm_contains(PyObject *self, PyObject *arg)
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212 {
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213 dbmobject *dp = (dbmobject *)self;
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214 datum key, val;
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215 Py_ssize_t size;
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216
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217 if ((dp)->di_dbm == NULL) {
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218 PyErr_SetString(DbmError,
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219 "DBM object has already been closed");
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220 return -1;
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221 }
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222 if (PyUnicode_Check(arg)) {
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223 key.dptr = PyUnicode_AsUTF8AndSize(arg, &size);
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224 key.dsize = size;
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225 if (key.dptr == NULL)
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226 return -1;
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227 }
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228 if (!PyBytes_Check(arg)) {
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229 PyErr_Format(PyExc_TypeError,
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230 "dbm key must be string, not %.100s",
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231 arg->ob_type->tp_name);
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232 return -1;
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233 }
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234 else {
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235 key.dptr = PyBytes_AS_STRING(arg);
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236 key.dsize = PyBytes_GET_SIZE(arg);
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237 }
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238 val = dbm_fetch(dp->di_dbm, key);
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239 return val.dptr != NULL;
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240 }
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241
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242 static PySequenceMethods dbm_as_sequence = {
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243 0, /* sq_length */
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244 0, /* sq_concat */
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245 0, /* sq_repeat */
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246 0, /* sq_item */
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247 0, /* sq_slice */
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248 0, /* sq_ass_item */
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249 0, /* sq_ass_slice */
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250 dbm_contains, /* sq_contains */
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251 0, /* sq_inplace_concat */
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252 0, /* sq_inplace_repeat */
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253 };
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254
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255 static PyObject *
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256 dbm_get(register dbmobject *dp, PyObject *args)
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257 {
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258 datum key, val;
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259 PyObject *defvalue = Py_None;
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260 char *tmp_ptr;
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261 Py_ssize_t tmp_size;
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262
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263 if (!PyArg_ParseTuple(args, "s#|O:get",
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264 &tmp_ptr, &tmp_size, &defvalue))
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265 return NULL;
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266 key.dptr = tmp_ptr;
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267 key.dsize = tmp_size;
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268 check_dbmobject_open(dp);
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269 val = dbm_fetch(dp->di_dbm, key);
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270 if (val.dptr != NULL)
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271 return PyBytes_FromStringAndSize(val.dptr, val.dsize);
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272 else {
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273 Py_INCREF(defvalue);
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274 return defvalue;
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275 }
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276 }
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277
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278 static PyObject *
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279 dbm_setdefault(register dbmobject *dp, PyObject *args)
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280 {
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281 datum key, val;
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282 PyObject *defvalue = NULL;
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283 char *tmp_ptr;
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284 Py_ssize_t tmp_size;
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285
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286 if (!PyArg_ParseTuple(args, "s#|O:setdefault",
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287 &tmp_ptr, &tmp_size, &defvalue))
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288 return NULL;
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289 key.dptr = tmp_ptr;
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290 key.dsize = tmp_size;
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291 check_dbmobject_open(dp);
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292 val = dbm_fetch(dp->di_dbm, key);
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293 if (val.dptr != NULL)
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294 return PyBytes_FromStringAndSize(val.dptr, val.dsize);
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295 if (defvalue == NULL) {
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296 defvalue = PyBytes_FromStringAndSize(NULL, 0);
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297 if (defvalue == NULL)
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298 return NULL;
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299 val.dptr = NULL;
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300 val.dsize = 0;
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301 }
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302 else {
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303 if ( !PyArg_Parse(defvalue, "s#", &val.dptr, &tmp_size) ) {
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304 PyErr_SetString(PyExc_TypeError,
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305 "dbm mappings have byte string elements only");
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306 return NULL;
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307 }
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308 val.dsize = tmp_size;
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309 Py_INCREF(defvalue);
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310 }
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311 if (dbm_store(dp->di_dbm, key, val, DBM_INSERT) < 0) {
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312 dbm_clearerr(dp->di_dbm);
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313 PyErr_SetString(DbmError, "cannot add item to database");
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314 Py_DECREF(defvalue);
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315 return NULL;
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316 }
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317 return defvalue;
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318 }
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319
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320 static PyMethodDef dbm_methods[] = {
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321 {"close", (PyCFunction)dbm__close, METH_NOARGS,
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322 "close()\nClose the database."},
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323 {"keys", (PyCFunction)dbm_keys, METH_NOARGS,
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324 "keys() -> list\nReturn a list of all keys in the database."},
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325 {"get", (PyCFunction)dbm_get, METH_VARARGS,
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326 "get(key[, default]) -> value\n"
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327 "Return the value for key if present, otherwise default."},
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328 {"setdefault", (PyCFunction)dbm_setdefault, METH_VARARGS,
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329 "setdefault(key[, default]) -> value\n"
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330 "Return the value for key if present, otherwise default. If key\n"
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331 "is not in the database, it is inserted with default as the value."},
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332 {NULL, NULL} /* sentinel */
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333 };
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334
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335 static PyTypeObject Dbmtype = {
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336 PyVarObject_HEAD_INIT(NULL, 0)
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337 "_dbm.dbm",
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338 sizeof(dbmobject),
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339 0,
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340 (destructor)dbm_dealloc, /*tp_dealloc*/
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341 0, /*tp_print*/
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342 0, /*tp_getattr*/
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343 0, /*tp_setattr*/
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344 0, /*tp_reserved*/
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345 0, /*tp_repr*/
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346 0, /*tp_as_number*/
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347 &dbm_as_sequence, /*tp_as_sequence*/
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348 &dbm_as_mapping, /*tp_as_mapping*/
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349 0, /*tp_hash*/
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350 0, /*tp_call*/
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351 0, /*tp_str*/
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352 0, /*tp_getattro*/
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353 0, /*tp_setattro*/
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354 0, /*tp_as_buffer*/
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355 Py_TPFLAGS_DEFAULT, /*tp_flags*/
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356 0, /*tp_doc*/
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357 0, /*tp_traverse*/
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358 0, /*tp_clear*/
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359 0, /*tp_richcompare*/
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360 0, /*tp_weaklistoffset*/
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361 0, /*tp_iter*/
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362 0, /*tp_iternext*/
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363 dbm_methods, /*tp_methods*/
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364 };
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365
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366 /* ----------------------------------------------------------------- */
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367
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368 static PyObject *
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369 dbmopen(PyObject *self, PyObject *args)
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370 {
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371 char *name;
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372 char *flags = "r";
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373 int iflags;
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374 int mode = 0666;
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375
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376 if ( !PyArg_ParseTuple(args, "s|si:open", &name, &flags, &mode) )
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377 return NULL;
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378 if ( strcmp(flags, "r") == 0 )
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379 iflags = O_RDONLY;
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380 else if ( strcmp(flags, "w") == 0 )
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381 iflags = O_RDWR;
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382 else if ( strcmp(flags, "rw") == 0 ) /* B/W compat */
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383 iflags = O_RDWR|O_CREAT;
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384 else if ( strcmp(flags, "c") == 0 )
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385 iflags = O_RDWR|O_CREAT;
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386 else if ( strcmp(flags, "n") == 0 )
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387 iflags = O_RDWR|O_CREAT|O_TRUNC;
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388 else {
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389 PyErr_SetString(DbmError,
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390 "arg 2 to open should be 'r', 'w', 'c', or 'n'");
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391 return NULL;
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392 }
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393 return newdbmobject(name, iflags, mode);
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394 }
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395
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396 static PyMethodDef dbmmodule_methods[] = {
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397 { "open", (PyCFunction)dbmopen, METH_VARARGS,
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398 "open(path[, flag[, mode]]) -> mapping\n"
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399 "Return a database object."},
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400 { 0, 0 },
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401 };
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402
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403
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404 static struct PyModuleDef _dbmmodule = {
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405 PyModuleDef_HEAD_INIT,
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406 "_dbm",
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407 NULL,
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408 -1,
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409 dbmmodule_methods,
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410 NULL,
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411 NULL,
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412 NULL,
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413 NULL
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414 };
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415
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416 PyMODINIT_FUNC
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417 PyInit__dbm(void) {
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418 PyObject *m, *d, *s;
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419
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420 if (PyType_Ready(&Dbmtype) < 0)
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421 return NULL;
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422 m = PyModule_Create(&_dbmmodule);
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423 if (m == NULL)
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424 return NULL;
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425 d = PyModule_GetDict(m);
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426 if (DbmError == NULL)
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427 DbmError = PyErr_NewException("_dbm.error",
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428 PyExc_IOError, NULL);
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429 s = PyUnicode_FromString(which_dbm);
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430 if (s != NULL) {
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431 PyDict_SetItemString(d, "library", s);
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432 Py_DECREF(s);
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433 }
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434 if (DbmError != NULL)
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435 PyDict_SetItemString(d, "error", DbmError);
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436 if (PyErr_Occurred()) {
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437 Py_DECREF(m);
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438 m = NULL;
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439 }
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440 return m;
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441 }