mirror of https://github.com/python/cpython
401 lines
8.5 KiB
C
401 lines
8.5 KiB
C
/* GDBM module, hacked from the still-breathing corpse of the
|
|
DBM module by anthony.baxter@aaii.oz.au. Original copyright
|
|
follows:
|
|
*/
|
|
/***********************************************************
|
|
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
|
|
The Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee is hereby granted,
|
|
provided that the above copyright notice appear in all copies and that
|
|
both that copyright notice and this permission notice appear in
|
|
supporting documentation, and that the names of Stichting Mathematisch
|
|
Centrum or CWI or Corporation for National Research Initiatives or
|
|
CNRI not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior
|
|
permission.
|
|
|
|
While CWI is the initial source for this software, a modified version
|
|
is made available by the Corporation for National Research Initiatives
|
|
(CNRI) at the Internet address ftp://ftp.python.org.
|
|
|
|
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
|
|
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
|
|
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
|
|
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
******************************************************************/
|
|
|
|
/* DBM module using dictionary interface */
|
|
|
|
|
|
#include "Python.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include "gdbm.h"
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
int di_size; /* -1 means recompute */
|
|
GDBM_FILE di_dbm;
|
|
} dbmobject;
|
|
|
|
staticforward PyTypeObject Dbmtype;
|
|
|
|
#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
|
|
|
|
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;
|
|
errno = 0;
|
|
if ( (dp->di_dbm = gdbm_open(file, 0, flags, mode, NULL)) == 0 ) {
|
|
if (errno != 0)
|
|
PyErr_SetFromErrno(DbmError);
|
|
else
|
|
PyErr_SetString(DbmError,
|
|
(char *) gdbm_strerror(gdbm_errno));
|
|
Py_DECREF(dp);
|
|
return NULL;
|
|
}
|
|
return (PyObject *)dp;
|
|
}
|
|
|
|
/* Methods */
|
|
|
|
static void
|
|
dbm_dealloc(dp)
|
|
register dbmobject *dp;
|
|
{
|
|
if ( dp->di_dbm )
|
|
gdbm_close(dp->di_dbm);
|
|
PyMem_DEL(dp);
|
|
}
|
|
|
|
static int
|
|
dbm_length(dp)
|
|
dbmobject *dp;
|
|
{
|
|
if ( dp->di_size < 0 ) {
|
|
datum key,okey;
|
|
int size;
|
|
okey.dsize=0;
|
|
|
|
size = 0;
|
|
for ( key=gdbm_firstkey(dp->di_dbm); key.dptr;
|
|
key = gdbm_nextkey(dp->di_dbm,okey)) {
|
|
size++;
|
|
if(okey.dsize) free(okey.dptr);
|
|
okey=key;
|
|
}
|
|
dp->di_size = size;
|
|
}
|
|
return dp->di_size;
|
|
}
|
|
|
|
static PyObject *
|
|
dbm_subscript(dp, key)
|
|
dbmobject *dp;
|
|
register PyObject *key;
|
|
{
|
|
PyObject *v;
|
|
datum drec, krec;
|
|
|
|
if (!PyArg_Parse(key, "s#", &krec.dptr, &krec.dsize) )
|
|
return NULL;
|
|
|
|
drec = gdbm_fetch(dp->di_dbm, krec);
|
|
if ( drec.dptr == 0 ) {
|
|
PyErr_SetString(PyExc_KeyError,
|
|
PyString_AS_STRING((PyStringObject *)key));
|
|
return NULL;
|
|
}
|
|
v = PyString_FromStringAndSize(drec.dptr, drec.dsize);
|
|
free(drec.dptr);
|
|
return v;
|
|
}
|
|
|
|
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,
|
|
"gdbm mappings have string indices only");
|
|
return -1;
|
|
}
|
|
dp->di_size = -1;
|
|
if (w == NULL) {
|
|
if ( gdbm_delete(dp->di_dbm, krec) < 0 ) {
|
|
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,
|
|
"gdbm mappings have string elements only");
|
|
return -1;
|
|
}
|
|
errno = 0;
|
|
if ( gdbm_store(dp->di_dbm, krec, drec, GDBM_REPLACE) < 0 ) {
|
|
if (errno != 0)
|
|
PyErr_SetFromErrno(DbmError);
|
|
else
|
|
PyErr_SetString(DbmError,
|
|
(char *) gdbm_strerror(gdbm_errno));
|
|
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 )
|
|
gdbm_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, nextkey;
|
|
int err;
|
|
|
|
if (dp == NULL || !is_dbmobject(dp)) {
|
|
PyErr_BadInternalCall();
|
|
return NULL;
|
|
}
|
|
|
|
if (!PyArg_NoArgs(args))
|
|
return NULL;
|
|
|
|
v = PyList_New(0);
|
|
if (v == NULL)
|
|
return NULL;
|
|
|
|
key = gdbm_firstkey(dp->di_dbm);
|
|
while (key.dptr) {
|
|
item = PyString_FromStringAndSize(key.dptr, key.dsize);
|
|
if (item == NULL) {
|
|
free(key.dptr);
|
|
Py_DECREF(v);
|
|
return NULL;
|
|
}
|
|
err = PyList_Append(v, item);
|
|
Py_DECREF(item);
|
|
if (err != 0) {
|
|
free(key.dptr);
|
|
Py_DECREF(v);
|
|
return NULL;
|
|
}
|
|
nextkey = gdbm_nextkey(dp->di_dbm, key);
|
|
free(key.dptr);
|
|
key = nextkey;
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
static PyObject *
|
|
dbm_has_key(dp, args)
|
|
register dbmobject *dp;
|
|
PyObject *args;
|
|
{
|
|
datum key;
|
|
|
|
if (!PyArg_Parse(args, "s#", &key.dptr, &key.dsize))
|
|
return NULL;
|
|
return PyInt_FromLong((long) gdbm_exists(dp->di_dbm, key));
|
|
}
|
|
|
|
static PyObject *
|
|
dbm_firstkey(dp, args)
|
|
register dbmobject *dp;
|
|
PyObject *args;
|
|
{
|
|
register PyObject *v;
|
|
datum key;
|
|
|
|
if (!PyArg_NoArgs(args))
|
|
return NULL;
|
|
key = gdbm_firstkey(dp->di_dbm);
|
|
if (key.dptr) {
|
|
v = PyString_FromStringAndSize(key.dptr, key.dsize);
|
|
free(key.dptr);
|
|
return v;
|
|
} else {
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
}
|
|
|
|
static PyObject *
|
|
dbm_nextkey(dp, args)
|
|
register dbmobject *dp;
|
|
PyObject *args;
|
|
{
|
|
register PyObject *v;
|
|
datum key, nextkey;
|
|
|
|
if (!PyArg_Parse(args, "s#", &key.dptr, &key.dsize))
|
|
return NULL;
|
|
nextkey = gdbm_nextkey(dp->di_dbm, key);
|
|
if (nextkey.dptr) {
|
|
v = PyString_FromStringAndSize(nextkey.dptr, nextkey.dsize);
|
|
free(nextkey.dptr);
|
|
return v;
|
|
} else {
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
}
|
|
|
|
static PyObject *
|
|
dbm_reorganize(dp, args)
|
|
register dbmobject *dp;
|
|
PyObject *args;
|
|
{
|
|
if (!PyArg_NoArgs(args))
|
|
return NULL;
|
|
errno = 0;
|
|
if (gdbm_reorganize(dp->di_dbm) < 0) {
|
|
if (errno != 0)
|
|
PyErr_SetFromErrno(DbmError);
|
|
else
|
|
PyErr_SetString(DbmError,
|
|
(char *) gdbm_strerror(gdbm_errno));
|
|
return NULL;
|
|
}
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
|
|
static PyMethodDef dbm_methods[] = {
|
|
{"close", (PyCFunction)dbm_close},
|
|
{"keys", (PyCFunction)dbm_keys},
|
|
{"has_key", (PyCFunction)dbm_has_key},
|
|
{"firstkey", (PyCFunction)dbm_firstkey},
|
|
{"nextkey", (PyCFunction)dbm_nextkey},
|
|
{"reorganize", (PyCFunction)dbm_reorganize},
|
|
{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,
|
|
"gdbm",
|
|
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;
|
|
|
|
/* XXXX add other flags. 2nd character can be "f" meaning open in fast mode. */
|
|
if ( !PyArg_ParseTuple(args, "s|si", &name, &flags, &mode) )
|
|
return NULL;
|
|
switch (flags[0]) {
|
|
case 'r':
|
|
iflags = GDBM_READER;
|
|
break;
|
|
case 'w':
|
|
iflags = GDBM_WRITER;
|
|
break;
|
|
case 'c':
|
|
iflags = GDBM_WRCREAT;
|
|
break;
|
|
case 'n':
|
|
iflags = GDBM_NEWDB;
|
|
break;
|
|
default:
|
|
PyErr_SetString(DbmError,
|
|
"Flags should be one of 'r', 'w', 'c' or 'n'");
|
|
return NULL;
|
|
}
|
|
if (flags[1] == 'f')
|
|
iflags |= GDBM_FAST;
|
|
return newdbmobject(name, iflags, mode);
|
|
}
|
|
|
|
static PyMethodDef dbmmodule_methods[] = {
|
|
{ "open", (PyCFunction)dbmopen, 1 },
|
|
{ 0, 0 },
|
|
};
|
|
|
|
void
|
|
initgdbm() {
|
|
PyObject *m, *d;
|
|
|
|
m = Py_InitModule("gdbm", dbmmodule_methods);
|
|
d = PyModule_GetDict(m);
|
|
DbmError = PyString_FromString("gdbm.error");
|
|
if ( DbmError == NULL || PyDict_SetItemString(d, "error", DbmError) )
|
|
Py_FatalError("can't define gdbm.error");
|
|
}
|