/* DBM module using dictionary interface */ #include "Python.h" #include #include #include /* Some Linux systems install gdbm/ndbm.h, but not ndbm.h. This supports * whichever configure was able to locate. */ #if defined(HAVE_NDBM_H) #include #elif defined(HAVE_DB1_NDBM_H) #include #elif defined(HAVE_GDBM_NDBM_H) #include #else #error "No ndbm.h available!" #endif typedef struct { PyObject_HEAD int di_size; /* -1 means recompute */ DBM *di_dbm; } dbmobject; staticforward PyTypeObject Dbmtype; #define is_dbmobject(v) ((v)->ob_type == &Dbmtype) #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \ { PyErr_SetString(DbmError, "DBM object has already been closed"); \ return NULL; } static PyObject *DbmError; static PyObject * newdbmobject(char *file, int flags, int mode) { dbmobject *dp; dp = PyObject_New(dbmobject, &Dbmtype); if (dp == NULL) return NULL; dp->di_size = -1; if ( (dp->di_dbm = dbm_open(file, flags, mode)) == 0 ) { PyErr_SetFromErrno(DbmError); Py_DECREF(dp); return NULL; } return (PyObject *)dp; } /* Methods */ static void dbm_dealloc(register dbmobject *dp) { if ( dp->di_dbm ) dbm_close(dp->di_dbm); PyObject_Del(dp); } static int dbm_length(dbmobject *dp) { if (dp->di_dbm == NULL) { PyErr_SetString(DbmError, "DBM object has already been closed"); return -1; } if ( dp->di_size < 0 ) { datum key; int size; size = 0; for ( key=dbm_firstkey(dp->di_dbm); key.dptr; key = dbm_nextkey(dp->di_dbm)) size++; dp->di_size = size; } return dp->di_size; } static PyObject * dbm_subscript(dbmobject *dp, register PyObject *key) { datum drec, krec; if (!PyArg_Parse(key, "s#", &krec.dptr, &krec.dsize) ) return NULL; check_dbmobject_open(dp); drec = dbm_fetch(dp->di_dbm, krec); if ( drec.dptr == 0 ) { PyErr_SetString(PyExc_KeyError, PyString_AS_STRING((PyStringObject *)key)); return NULL; } if ( dbm_error(dp->di_dbm) ) { dbm_clearerr(dp->di_dbm); PyErr_SetString(DbmError, ""); return NULL; } return PyString_FromStringAndSize(drec.dptr, drec.dsize); } static int dbm_ass_sub(dbmobject *dp, PyObject *v, PyObject *w) { datum krec, drec; if ( !PyArg_Parse(v, "s#", &krec.dptr, &krec.dsize) ) { PyErr_SetString(PyExc_TypeError, "dbm mappings have string indices only"); return -1; } if (dp->di_dbm == NULL) { PyErr_SetString(DbmError, "DBM object has already been closed"); return -1; } dp->di_size = -1; if (w == NULL) { if ( dbm_delete(dp->di_dbm, krec) < 0 ) { dbm_clearerr(dp->di_dbm); PyErr_SetString(PyExc_KeyError, PyString_AS_STRING((PyStringObject *)v)); return -1; } } else { if ( !PyArg_Parse(w, "s#", &drec.dptr, &drec.dsize) ) { PyErr_SetString(PyExc_TypeError, "dbm mappings have string elements only"); return -1; } if ( dbm_store(dp->di_dbm, krec, drec, DBM_REPLACE) < 0 ) { dbm_clearerr(dp->di_dbm); PyErr_SetString(DbmError, "Cannot add item to database"); return -1; } } if ( dbm_error(dp->di_dbm) ) { dbm_clearerr(dp->di_dbm); PyErr_SetString(DbmError, ""); return -1; } return 0; } static PyMappingMethods dbm_as_mapping = { (inquiry)dbm_length, /*mp_length*/ (binaryfunc)dbm_subscript, /*mp_subscript*/ (objobjargproc)dbm_ass_sub, /*mp_ass_subscript*/ }; static PyObject * dbm__close(register dbmobject *dp, PyObject *args) { if ( !PyArg_NoArgs(args) ) return NULL; if ( dp->di_dbm ) dbm_close(dp->di_dbm); dp->di_dbm = NULL; Py_INCREF(Py_None); return Py_None; } static PyObject * dbm_keys(register dbmobject *dp, PyObject *args) { register PyObject *v, *item; datum key; int err; if (!PyArg_NoArgs(args)) return NULL; check_dbmobject_open(dp); v = PyList_New(0); if (v == NULL) return NULL; for (key = dbm_firstkey(dp->di_dbm); key.dptr; key = dbm_nextkey(dp->di_dbm)) { item = PyString_FromStringAndSize(key.dptr, key.dsize); if (item == NULL) { Py_DECREF(v); return NULL; } err = PyList_Append(v, item); Py_DECREF(item); if (err != 0) { Py_DECREF(v); return NULL; } } return v; } static PyObject * dbm_has_key(register dbmobject *dp, PyObject *args) { datum key, val; if (!PyArg_Parse(args, "s#", &key.dptr, &key.dsize)) return NULL; check_dbmobject_open(dp); val = dbm_fetch(dp->di_dbm, key); return PyInt_FromLong(val.dptr != NULL); } static PyMethodDef dbm_methods[] = { {"close", (PyCFunction)dbm__close}, {"keys", (PyCFunction)dbm_keys}, {"has_key", (PyCFunction)dbm_has_key}, {NULL, NULL} /* sentinel */ }; static PyObject * dbm_getattr(dbmobject *dp, char *name) { return Py_FindMethod(dbm_methods, (PyObject *)dp, name); } static PyTypeObject Dbmtype = { PyObject_HEAD_INIT(&PyType_Type) 0, "dbm", sizeof(dbmobject), 0, (destructor)dbm_dealloc, /*tp_dealloc*/ 0, /*tp_print*/ (getattrfunc)dbm_getattr, /*tp_getattr*/ 0, /*tp_setattr*/ 0, /*tp_compare*/ 0, /*tp_repr*/ 0, /*tp_as_number*/ 0, /*tp_as_sequence*/ &dbm_as_mapping, /*tp_as_mapping*/ }; /* ----------------------------------------------------------------- */ static PyObject * dbmopen(PyObject *self, PyObject *args) { char *name; char *flags = "r"; int iflags; int mode = 0666; if ( !PyArg_ParseTuple(args, "s|si:open", &name, &flags, &mode) ) return NULL; if ( strcmp(flags, "r") == 0 ) iflags = O_RDONLY; else if ( strcmp(flags, "w") == 0 ) iflags = O_RDWR; else if ( strcmp(flags, "rw") == 0 ) /* B/W compat */ iflags = O_RDWR|O_CREAT; else if ( strcmp(flags, "c") == 0 ) iflags = O_RDWR|O_CREAT; else if ( strcmp(flags, "n") == 0 ) iflags = O_RDWR|O_CREAT|O_TRUNC; else { PyErr_SetString(DbmError, "Flags should be one of 'r', 'w', 'c' or 'n'"); return NULL; } return newdbmobject(name, iflags, mode); } static PyMethodDef dbmmodule_methods[] = { { "open", (PyCFunction)dbmopen, 1 }, { 0, 0 }, }; DL_EXPORT(void) initdbm(void) { PyObject *m, *d; m = Py_InitModule("dbm", dbmmodule_methods); d = PyModule_GetDict(m); DbmError = PyErr_NewException("dbm.error", NULL, NULL); if (DbmError != NULL) PyDict_SetItemString(d, "error", DbmError); }