mirror of https://github.com/python/cpython.git
303 lines
6.5 KiB
C
303 lines
6.5 KiB
C
/***********************************************************
|
|
Copyright (c) 2000, BeOpen.com.
|
|
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
|
|
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
|
|
All rights reserved.
|
|
|
|
See the file "Misc/COPYRIGHT" for information on usage and
|
|
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|
******************************************************************/
|
|
|
|
/* DBM module using dictionary interface */
|
|
|
|
|
|
#include "Python.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <ndbm.h>
|
|
|
|
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(file, flags, mode)
|
|
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(dp)
|
|
register dbmobject *dp;
|
|
{
|
|
if ( dp->di_dbm )
|
|
dbm_close(dp->di_dbm);
|
|
PyObject_Del(dp);
|
|
}
|
|
|
|
static int
|
|
dbm_length(dp)
|
|
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(dp, key)
|
|
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(dp, v, w)
|
|
dbmobject *dp;
|
|
PyObject *v, *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(dp, args)
|
|
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(dp, args)
|
|
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(dp, args)
|
|
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(dp, name)
|
|
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(self, args)
|
|
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() {
|
|
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);
|
|
}
|