358 lines
8.5 KiB
C
358 lines
8.5 KiB
C
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/* DBM module using dictionary interface */
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#include "Python.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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/* Some Linux systems install gdbm/ndbm.h, but not ndbm.h. This supports
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* whichever configure was able to locate.
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*/
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#if defined(HAVE_NDBM_H)
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#include <ndbm.h>
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static char *which_dbm = "ndbm";
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#elif defined(HAVE_DB1_NDBM_H)
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#include <db1/ndbm.h>
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static char *which_dbm = "BSD db";
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#elif defined(HAVE_GDBM_NDBM_H)
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#include <gdbm/ndbm.h>
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static char *which_dbm = "GNU gdbm";
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#else
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#error "No ndbm.h available!"
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#endif
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typedef struct {
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PyObject_HEAD
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int di_size; /* -1 means recompute */
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DBM *di_dbm;
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} dbmobject;
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staticforward PyTypeObject Dbmtype;
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#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
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#define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
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{ PyErr_SetString(DbmError, "DBM object has already been closed"); \
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return NULL; }
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static PyObject *DbmError;
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static PyObject *
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newdbmobject(char *file, int flags, int mode)
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{
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dbmobject *dp;
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dp = PyObject_New(dbmobject, &Dbmtype);
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if (dp == NULL)
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return NULL;
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dp->di_size = -1;
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if ( (dp->di_dbm = dbm_open(file, flags, mode)) == 0 ) {
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PyErr_SetFromErrno(DbmError);
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Py_DECREF(dp);
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return NULL;
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}
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return (PyObject *)dp;
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}
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/* Methods */
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static void
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dbm_dealloc(register dbmobject *dp)
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{
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if ( dp->di_dbm )
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dbm_close(dp->di_dbm);
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PyObject_Del(dp);
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}
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static int
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dbm_length(dbmobject *dp)
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{
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if (dp->di_dbm == NULL) {
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PyErr_SetString(DbmError, "DBM object has already been closed");
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return -1;
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}
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if ( dp->di_size < 0 ) {
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datum key;
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int size;
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size = 0;
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for ( key=dbm_firstkey(dp->di_dbm); key.dptr;
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key = dbm_nextkey(dp->di_dbm))
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size++;
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dp->di_size = size;
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}
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return dp->di_size;
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}
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static PyObject *
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dbm_subscript(dbmobject *dp, register PyObject *key)
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{
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datum drec, krec;
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if (!PyArg_Parse(key, "s#", &krec.dptr, &krec.dsize) )
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return NULL;
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check_dbmobject_open(dp);
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drec = dbm_fetch(dp->di_dbm, krec);
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if ( drec.dptr == 0 ) {
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PyErr_SetString(PyExc_KeyError,
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PyString_AS_STRING((PyStringObject *)key));
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return NULL;
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}
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if ( dbm_error(dp->di_dbm) ) {
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dbm_clearerr(dp->di_dbm);
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PyErr_SetString(DbmError, "");
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return NULL;
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}
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return PyString_FromStringAndSize(drec.dptr, drec.dsize);
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}
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static int
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dbm_ass_sub(dbmobject *dp, PyObject *v, PyObject *w)
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{
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datum krec, drec;
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if ( !PyArg_Parse(v, "s#", &krec.dptr, &krec.dsize) ) {
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PyErr_SetString(PyExc_TypeError,
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"dbm mappings have string indices only");
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return -1;
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}
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if (dp->di_dbm == NULL) {
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PyErr_SetString(DbmError, "DBM object has already been closed");
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return -1;
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}
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dp->di_size = -1;
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if (w == NULL) {
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if ( dbm_delete(dp->di_dbm, krec) < 0 ) {
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dbm_clearerr(dp->di_dbm);
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PyErr_SetString(PyExc_KeyError,
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PyString_AS_STRING((PyStringObject *)v));
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return -1;
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}
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} else {
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if ( !PyArg_Parse(w, "s#", &drec.dptr, &drec.dsize) ) {
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PyErr_SetString(PyExc_TypeError,
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"dbm mappings have string elements only");
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return -1;
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}
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if ( dbm_store(dp->di_dbm, krec, drec, DBM_REPLACE) < 0 ) {
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dbm_clearerr(dp->di_dbm);
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PyErr_SetString(DbmError,
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"cannot add item to database");
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return -1;
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}
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}
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if ( dbm_error(dp->di_dbm) ) {
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dbm_clearerr(dp->di_dbm);
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PyErr_SetString(DbmError, "");
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return -1;
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}
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return 0;
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}
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static PyMappingMethods dbm_as_mapping = {
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(inquiry)dbm_length, /*mp_length*/
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(binaryfunc)dbm_subscript, /*mp_subscript*/
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(objobjargproc)dbm_ass_sub, /*mp_ass_subscript*/
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};
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static PyObject *
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dbm__close(register dbmobject *dp, PyObject *args)
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{
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if (!PyArg_ParseTuple(args, ":close"))
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return NULL;
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if (dp->di_dbm)
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dbm_close(dp->di_dbm);
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dp->di_dbm = NULL;
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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dbm_keys(register dbmobject *dp, PyObject *args)
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{
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register PyObject *v, *item;
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datum key;
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int err;
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if (!PyArg_ParseTuple(args, ":keys"))
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return NULL;
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check_dbmobject_open(dp);
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v = PyList_New(0);
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if (v == NULL)
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return NULL;
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for (key = dbm_firstkey(dp->di_dbm); key.dptr;
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key = dbm_nextkey(dp->di_dbm)) {
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item = PyString_FromStringAndSize(key.dptr, key.dsize);
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if (item == NULL) {
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Py_DECREF(v);
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return NULL;
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}
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err = PyList_Append(v, item);
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Py_DECREF(item);
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if (err != 0) {
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Py_DECREF(v);
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return NULL;
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}
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}
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return v;
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}
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static PyObject *
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dbm_has_key(register dbmobject *dp, PyObject *args)
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{
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datum key, val;
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if (!PyArg_ParseTuple(args, "s#:has_key", &key.dptr, &key.dsize))
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return NULL;
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check_dbmobject_open(dp);
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val = dbm_fetch(dp->di_dbm, key);
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return PyInt_FromLong(val.dptr != NULL);
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}
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static PyObject *
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dbm_get(register dbmobject *dp, PyObject *args)
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{
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datum key, val;
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PyObject *defvalue = Py_None;
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if (!PyArg_ParseTuple(args, "s#|O:get",
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&key.dptr, &key.dsize, &defvalue))
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return NULL;
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check_dbmobject_open(dp);
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val = dbm_fetch(dp->di_dbm, key);
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if (val.dptr != NULL)
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return PyString_FromStringAndSize(val.dptr, val.dsize);
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else {
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Py_INCREF(defvalue);
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return defvalue;
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}
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}
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static PyObject *
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dbm_setdefault(register dbmobject *dp, PyObject *args)
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{
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datum key, val;
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PyObject *defvalue = NULL;
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if (!PyArg_ParseTuple(args, "s#|S:setdefault",
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&key.dptr, &key.dsize, &defvalue))
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return NULL;
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check_dbmobject_open(dp);
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val = dbm_fetch(dp->di_dbm, key);
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if (val.dptr != NULL)
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return PyString_FromStringAndSize(val.dptr, val.dsize);
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if (defvalue == NULL) {
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defvalue = PyString_FromStringAndSize(NULL, 0);
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if (defvalue == NULL)
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return NULL;
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}
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else
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Py_INCREF(defvalue);
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val.dptr = PyString_AS_STRING(defvalue);
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val.dsize = PyString_GET_SIZE(defvalue);
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if (dbm_store(dp->di_dbm, key, val, DBM_INSERT) < 0) {
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dbm_clearerr(dp->di_dbm);
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PyErr_SetString(DbmError, "cannot add item to database");
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return NULL;
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}
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return defvalue;
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}
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static PyMethodDef dbm_methods[] = {
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{"close", (PyCFunction)dbm__close, METH_VARARGS,
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"close()\nClose the database."},
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{"keys", (PyCFunction)dbm_keys, METH_VARARGS,
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"keys() -> list\nReturn a list of all keys in the database."},
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{"has_key", (PyCFunction)dbm_has_key, METH_VARARGS,
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"has_key(key} -> boolean\nReturn true iff key is in the database."},
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{"get", (PyCFunction)dbm_get, METH_VARARGS,
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"get(key[, default]) -> value\n"
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"Return the value for key if present, otherwise default."},
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{"setdefault", (PyCFunction)dbm_setdefault, METH_VARARGS,
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"setdefault(key[, default]) -> value\n"
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"Return the value for key if present, otherwise default. If key\n"
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"is not in the database, it is inserted with default as the value."},
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{NULL, NULL} /* sentinel */
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};
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static PyObject *
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dbm_getattr(dbmobject *dp, char *name)
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{
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return Py_FindMethod(dbm_methods, (PyObject *)dp, name);
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}
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static PyTypeObject Dbmtype = {
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PyObject_HEAD_INIT(NULL)
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0,
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"dbm",
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sizeof(dbmobject),
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0,
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(destructor)dbm_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)dbm_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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&dbm_as_mapping, /*tp_as_mapping*/
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};
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/* ----------------------------------------------------------------- */
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static PyObject *
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dbmopen(PyObject *self, PyObject *args)
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{
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char *name;
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char *flags = "r";
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int iflags;
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int mode = 0666;
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if ( !PyArg_ParseTuple(args, "s|si:open", &name, &flags, &mode) )
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return NULL;
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if ( strcmp(flags, "r") == 0 )
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iflags = O_RDONLY;
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else if ( strcmp(flags, "w") == 0 )
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iflags = O_RDWR;
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else if ( strcmp(flags, "rw") == 0 ) /* B/W compat */
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iflags = O_RDWR|O_CREAT;
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else if ( strcmp(flags, "c") == 0 )
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iflags = O_RDWR|O_CREAT;
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else if ( strcmp(flags, "n") == 0 )
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iflags = O_RDWR|O_CREAT|O_TRUNC;
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else {
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PyErr_SetString(DbmError,
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"arg 2 to open should be 'r', 'w', 'c', or 'n'");
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return NULL;
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}
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return newdbmobject(name, iflags, mode);
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}
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static PyMethodDef dbmmodule_methods[] = {
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{ "open", (PyCFunction)dbmopen, METH_VARARGS,
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"open(path[, flag[, mode]]) -> mapping\n"
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"Return a database object."},
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{ 0, 0 },
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};
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DL_EXPORT(void)
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initdbm(void) {
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PyObject *m, *d, *s;
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Dbmtype.ob_type = &PyType_Type;
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m = Py_InitModule("dbm", dbmmodule_methods);
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d = PyModule_GetDict(m);
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if (DbmError == NULL)
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DbmError = PyErr_NewException("dbm.error", NULL, NULL);
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s = PyString_FromString(which_dbm);
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if (s != NULL) {
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PyDict_SetItemString(d, "library", s);
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Py_DECREF(s);
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}
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if (DbmError != NULL)
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PyDict_SetItemString(d, "error", DbmError);
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}
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