2 /* DBM module using dictionary interface */
11 /* Some Linux systems install gdbm/ndbm.h, but not ndbm.h. This supports
12 * whichever configure was able to locate.
14 #if defined(HAVE_NDBM_H)
16 #if defined(PYOS_OS2) && !defined(PYCC_GCC)
17 static char *which_dbm = "ndbm";
19 static char *which_dbm = "GNU gdbm"; /* EMX port of GDBM */
21 #elif defined(HAVE_GDBM_NDBM_H)
22 #include <gdbm/ndbm.h>
23 static char *which_dbm = "GNU gdbm";
24 #elif defined(HAVE_GDBM_DASH_NDBM_H)
25 #include <gdbm-ndbm.h>
26 static char *which_dbm = "GNU gdbm";
27 #elif defined(HAVE_BERKDB_H)
29 static char *which_dbm = "Berkeley DB";
31 #error "No ndbm.h available!"
36 int di_size; /* -1 means recompute */
40 static PyTypeObject Dbmtype;
42 #define is_dbmobject(v) (Py_TYPE(v) == &Dbmtype)
43 #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
44 { PyErr_SetString(DbmError, "DBM object has already been closed"); \
47 static PyObject *DbmError;
50 newdbmobject(char *file, int flags, int mode)
54 dp = PyObject_New(dbmobject, &Dbmtype);
58 if ( (dp->di_dbm = dbm_open(file, flags, mode)) == 0 ) {
59 PyErr_SetFromErrno(DbmError);
63 return (PyObject *)dp;
69 dbm_dealloc(register dbmobject *dp)
72 dbm_close(dp->di_dbm);
77 dbm_length(dbmobject *dp)
79 if (dp->di_dbm == NULL) {
80 PyErr_SetString(DbmError, "DBM object has already been closed");
83 if ( dp->di_size < 0 ) {
88 for ( key=dbm_firstkey(dp->di_dbm); key.dptr;
89 key = dbm_nextkey(dp->di_dbm))
97 dbm_subscript(dbmobject *dp, register PyObject *key)
102 if (!PyArg_Parse(key, "s#", &krec.dptr, &tmp_size) )
105 krec.dsize = tmp_size;
106 check_dbmobject_open(dp);
107 drec = dbm_fetch(dp->di_dbm, krec);
108 if ( drec.dptr == 0 ) {
109 PyErr_SetString(PyExc_KeyError,
110 PyString_AS_STRING((PyStringObject *)key));
113 if ( dbm_error(dp->di_dbm) ) {
114 dbm_clearerr(dp->di_dbm);
115 PyErr_SetString(DbmError, "");
118 return PyString_FromStringAndSize(drec.dptr, drec.dsize);
122 dbm_ass_sub(dbmobject *dp, PyObject *v, PyObject *w)
127 if ( !PyArg_Parse(v, "s#", &krec.dptr, &tmp_size) ) {
128 PyErr_SetString(PyExc_TypeError,
129 "dbm mappings have string indices only");
132 krec.dsize = tmp_size;
133 if (dp->di_dbm == NULL) {
134 PyErr_SetString(DbmError, "DBM object has already been closed");
139 if ( dbm_delete(dp->di_dbm, krec) < 0 ) {
140 dbm_clearerr(dp->di_dbm);
141 PyErr_SetString(PyExc_KeyError,
142 PyString_AS_STRING((PyStringObject *)v));
146 if ( !PyArg_Parse(w, "s#", &drec.dptr, &tmp_size) ) {
147 PyErr_SetString(PyExc_TypeError,
148 "dbm mappings have string elements only");
151 drec.dsize = tmp_size;
152 if ( dbm_store(dp->di_dbm, krec, drec, DBM_REPLACE) < 0 ) {
153 dbm_clearerr(dp->di_dbm);
154 PyErr_SetString(DbmError,
155 "cannot add item to database");
159 if ( dbm_error(dp->di_dbm) ) {
160 dbm_clearerr(dp->di_dbm);
161 PyErr_SetString(DbmError, "");
168 dbm_contains(register dbmobject *dp, PyObject *v)
172 if (PyString_AsStringAndSize(v, (char **)&key.dptr,
173 (Py_ssize_t *)&key.dsize)) {
177 /* Expand check_dbmobject_open to return -1 */
178 if (dp->di_dbm == NULL) {
179 PyErr_SetString(DbmError, "DBM object has already been closed");
182 val = dbm_fetch(dp->di_dbm, key);
183 return val.dptr != NULL;
186 static PySequenceMethods dbm_as_sequence = {
187 (lenfunc)dbm_length, /*_length*/
194 (objobjproc)dbm_contains, /*sq_contains*/
195 0, /*sq_inplace_concat*/
196 0 /*sq_inplace_repeat*/
199 static PyMappingMethods dbm_as_mapping = {
200 (lenfunc)dbm_length, /*mp_length*/
201 (binaryfunc)dbm_subscript, /*mp_subscript*/
202 (objobjargproc)dbm_ass_sub, /*mp_ass_subscript*/
206 dbm__close(register dbmobject *dp, PyObject *unused)
209 dbm_close(dp->di_dbm);
216 dbm_keys(register dbmobject *dp, PyObject *unused)
218 register PyObject *v, *item;
222 check_dbmobject_open(dp);
226 for (key = dbm_firstkey(dp->di_dbm); key.dptr;
227 key = dbm_nextkey(dp->di_dbm)) {
228 item = PyString_FromStringAndSize(key.dptr, key.dsize);
233 err = PyList_Append(v, item);
244 dbm_has_key(register dbmobject *dp, PyObject *args)
250 if (!PyArg_ParseTuple(args, "s#:has_key", &tmp_ptr, &tmp_size))
253 key.dsize = tmp_size;
254 check_dbmobject_open(dp);
255 val = dbm_fetch(dp->di_dbm, key);
256 return PyInt_FromLong(val.dptr != NULL);
260 dbm_get(register dbmobject *dp, PyObject *args)
263 PyObject *defvalue = Py_None;
267 if (!PyArg_ParseTuple(args, "s#|O:get",
268 &tmp_ptr, &tmp_size, &defvalue))
271 key.dsize = tmp_size;
272 check_dbmobject_open(dp);
273 val = dbm_fetch(dp->di_dbm, key);
274 if (val.dptr != NULL)
275 return PyString_FromStringAndSize(val.dptr, val.dsize);
283 dbm_setdefault(register dbmobject *dp, PyObject *args)
286 PyObject *defvalue = NULL;
290 if (!PyArg_ParseTuple(args, "s#|S:setdefault",
291 &tmp_ptr, &tmp_size, &defvalue))
294 key.dsize = tmp_size;
295 check_dbmobject_open(dp);
296 val = dbm_fetch(dp->di_dbm, key);
297 if (val.dptr != NULL)
298 return PyString_FromStringAndSize(val.dptr, val.dsize);
299 if (defvalue == NULL) {
300 defvalue = PyString_FromStringAndSize(NULL, 0);
301 if (defvalue == NULL)
306 val.dptr = PyString_AS_STRING(defvalue);
307 val.dsize = PyString_GET_SIZE(defvalue);
308 if (dbm_store(dp->di_dbm, key, val, DBM_INSERT) < 0) {
309 dbm_clearerr(dp->di_dbm);
310 PyErr_SetString(DbmError, "cannot add item to database");
316 static PyMethodDef dbm_methods[] = {
317 {"close", (PyCFunction)dbm__close, METH_NOARGS,
318 "close()\nClose the database."},
319 {"keys", (PyCFunction)dbm_keys, METH_NOARGS,
320 "keys() -> list\nReturn a list of all keys in the database."},
321 {"has_key", (PyCFunction)dbm_has_key, METH_VARARGS,
322 "has_key(key} -> boolean\nReturn true iff key is in the database."},
323 {"get", (PyCFunction)dbm_get, METH_VARARGS,
324 "get(key[, default]) -> value\n"
325 "Return the value for key if present, otherwise default."},
326 {"setdefault", (PyCFunction)dbm_setdefault, METH_VARARGS,
327 "setdefault(key[, default]) -> value\n"
328 "Return the value for key if present, otherwise default. If key\n"
329 "is not in the database, it is inserted with default as the value."},
330 {NULL, NULL} /* sentinel */
334 dbm_getattr(dbmobject *dp, char *name)
336 return Py_FindMethod(dbm_methods, (PyObject *)dp, name);
339 static PyTypeObject Dbmtype = {
340 PyVarObject_HEAD_INIT(NULL, 0)
344 (destructor)dbm_dealloc, /*tp_dealloc*/
346 (getattrfunc)dbm_getattr, /*tp_getattr*/
351 &dbm_as_sequence, /*tp_as_sequence*/
352 &dbm_as_mapping, /*tp_as_mapping*/
359 Py_TPFLAGS_DEFAULT, /*tp_xxx4*/
362 /* ----------------------------------------------------------------- */
365 dbmopen(PyObject *self, PyObject *args)
372 if ( !PyArg_ParseTuple(args, "s|si:open", &name, &flags, &mode) )
374 if ( strcmp(flags, "r") == 0 )
376 else if ( strcmp(flags, "w") == 0 )
378 else if ( strcmp(flags, "rw") == 0 ) /* B/W compat */
379 iflags = O_RDWR|O_CREAT;
380 else if ( strcmp(flags, "c") == 0 )
381 iflags = O_RDWR|O_CREAT;
382 else if ( strcmp(flags, "n") == 0 )
383 iflags = O_RDWR|O_CREAT|O_TRUNC;
385 PyErr_SetString(DbmError,
386 "arg 2 to open should be 'r', 'w', 'c', or 'n'");
389 return newdbmobject(name, iflags, mode);
392 static PyMethodDef dbmmodule_methods[] = {
393 { "open", (PyCFunction)dbmopen, METH_VARARGS,
394 "open(path[, flag[, mode]]) -> mapping\n"
395 "Return a database object."},
403 Dbmtype.ob_type = &PyType_Type;
404 m = Py_InitModule("dbm", dbmmodule_methods);
407 d = PyModule_GetDict(m);
408 if (DbmError == NULL)
409 DbmError = PyErr_NewException("dbm.error", NULL, NULL);
410 s = PyString_FromString(which_dbm);
412 PyDict_SetItemString(d, "library", s);
415 if (DbmError != NULL)
416 PyDict_SetItemString(d, "error", DbmError);