722 lines
19 KiB
C
722 lines
19 KiB
C
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/* DBM module using dictionary interface */
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/* Author: Anthony Baxter, after dbmmodule.c */
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/* Doc strings: Mitch Chapman */
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#define PY_SSIZE_T_CLEAN
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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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#include "gdbm.h"
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#if defined(WIN32) && !defined(__CYGWIN__)
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#include "gdbmerrno.h"
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extern const char * gdbm_strerror(gdbm_error);
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#endif
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/*[clinic input]
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module _gdbm
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class _gdbm.gdbm "dbmobject *" "&Dbmtype"
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[clinic start generated code]*/
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/*[clinic end generated code: output=da39a3ee5e6b4b0d input=113927c6170729b2]*/
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PyDoc_STRVAR(gdbmmodule__doc__,
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"This module provides an interface to the GNU DBM (GDBM) library.\n\
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\n\
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This module is quite similar to the dbm module, but uses GDBM instead to\n\
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provide some additional functionality. Please note that the file formats\n\
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created by GDBM and dbm are incompatible.\n\
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\n\
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GDBM objects behave like mappings (dictionaries), except that keys and\n\
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values are always immutable bytes-like objects or strings. Printing\n\
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a GDBM object doesn't print the keys and values, and the items() and\n\
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values() methods are not supported.");
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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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GDBM_FILE di_dbm;
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} dbmobject;
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static PyTypeObject Dbmtype;
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#include "clinic/_gdbmmodule.c.h"
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#define is_dbmobject(v) (Py_TYPE(v) == &Dbmtype)
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#define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
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{ PyErr_SetString(DbmError, "GDBM object has already been closed"); \
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return NULL; }
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static PyObject *DbmError;
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PyDoc_STRVAR(gdbm_object__doc__,
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"This object represents a GDBM database.\n\
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GDBM objects behave like mappings (dictionaries), except that keys and\n\
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values are always immutable bytes-like objects or strings. Printing\n\
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a GDBM object doesn't print the keys and values, and the items() and\n\
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values() methods are not supported.\n\
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\n\
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GDBM objects also support additional operations such as firstkey,\n\
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nextkey, reorganize, and sync.");
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static PyObject *
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newdbmobject(const 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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errno = 0;
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if ((dp->di_dbm = gdbm_open((char *)file, 0, flags, mode, NULL)) == 0) {
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if (errno != 0)
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PyErr_SetFromErrnoWithFilename(DbmError, file);
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else
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PyErr_SetString(DbmError, gdbm_strerror(gdbm_errno));
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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(dbmobject *dp)
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{
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if (dp->di_dbm)
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gdbm_close(dp->di_dbm);
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PyObject_Del(dp);
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}
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static Py_ssize_t
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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, "GDBM 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,okey;
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int size;
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okey.dsize=0;
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okey.dptr=NULL;
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size = 0;
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for (key=gdbm_firstkey(dp->di_dbm); key.dptr;
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key = gdbm_nextkey(dp->di_dbm,okey)) {
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size++;
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if(okey.dsize) free(okey.dptr);
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okey=key;
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}
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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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// Wrapper function for PyArg_Parse(o, "s#", &d.dptr, &d.size).
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// This function is needed to support PY_SSIZE_T_CLEAN.
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// Return 1 on success, same to PyArg_Parse().
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static int
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parse_datum(PyObject *o, datum *d, const char *failmsg)
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{
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Py_ssize_t size;
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if (!PyArg_Parse(o, "s#", &d->dptr, &size)) {
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if (failmsg != NULL) {
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PyErr_SetString(PyExc_TypeError, failmsg);
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}
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return 0;
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}
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if (INT_MAX < size) {
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PyErr_SetString(PyExc_OverflowError, "size does not fit in an int");
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return 0;
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}
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d->dsize = size;
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return 1;
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}
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static PyObject *
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dbm_subscript(dbmobject *dp, PyObject *key)
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{
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PyObject *v;
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datum drec, krec;
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if (!parse_datum(key, &krec, NULL)) {
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return NULL;
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}
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if (dp->di_dbm == NULL) {
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PyErr_SetString(DbmError,
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"GDBM object has already been closed");
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return NULL;
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}
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drec = gdbm_fetch(dp->di_dbm, krec);
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if (drec.dptr == 0) {
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PyErr_SetObject(PyExc_KeyError, key);
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return NULL;
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}
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v = PyBytes_FromStringAndSize(drec.dptr, drec.dsize);
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free(drec.dptr);
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return v;
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}
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/*[clinic input]
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_gdbm.gdbm.get
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key: object
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default: object = None
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/
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Get the value for key, or default if not present.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_get_impl(dbmobject *self, PyObject *key, PyObject *default_value)
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/*[clinic end generated code: output=19b7c585ad4f554a input=a9c20423f34c17b6]*/
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{
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PyObject *res;
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res = dbm_subscript(self, key);
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if (res == NULL && PyErr_ExceptionMatches(PyExc_KeyError)) {
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PyErr_Clear();
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Py_INCREF(default_value);
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return default_value;
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}
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return res;
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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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const char *failmsg = "gdbm mappings have bytes or string indices only";
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if (!parse_datum(v, &krec, failmsg)) {
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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,
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"GDBM 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 (gdbm_delete(dp->di_dbm, krec) < 0) {
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if (gdbm_errno == GDBM_ITEM_NOT_FOUND) {
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PyErr_SetObject(PyExc_KeyError, v);
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}
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else {
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PyErr_SetString(DbmError, gdbm_strerror(gdbm_errno));
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}
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return -1;
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}
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}
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else {
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if (!parse_datum(w, &drec, failmsg)) {
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return -1;
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}
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errno = 0;
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if (gdbm_store(dp->di_dbm, krec, drec, GDBM_REPLACE) < 0) {
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if (errno != 0)
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PyErr_SetFromErrno(DbmError);
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else
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PyErr_SetString(DbmError,
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gdbm_strerror(gdbm_errno));
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return -1;
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}
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}
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return 0;
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}
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/*[clinic input]
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_gdbm.gdbm.setdefault
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key: object
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default: object = None
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/
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Get value for key, or set it to default and return default if not present.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_setdefault_impl(dbmobject *self, PyObject *key,
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PyObject *default_value)
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/*[clinic end generated code: output=88760ee520329012 input=0db46b69e9680171]*/
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{
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PyObject *res;
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res = dbm_subscript(self, key);
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if (res == NULL && PyErr_ExceptionMatches(PyExc_KeyError)) {
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PyErr_Clear();
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if (dbm_ass_sub(self, key, default_value) < 0)
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return NULL;
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return dbm_subscript(self, key);
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}
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return res;
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}
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static PyMappingMethods dbm_as_mapping = {
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(lenfunc)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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/*[clinic input]
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_gdbm.gdbm.close
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Close the database.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_close_impl(dbmobject *self)
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/*[clinic end generated code: output=23512a594598b563 input=0a203447379b45fd]*/
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{
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if (self->di_dbm)
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gdbm_close(self->di_dbm);
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self->di_dbm = NULL;
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Py_RETURN_NONE;
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}
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/* XXX Should return a set or a set view */
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/*[clinic input]
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_gdbm.gdbm.keys
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Get a list of all keys in the database.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_keys_impl(dbmobject *self)
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/*[clinic end generated code: output=cb4b1776c3645dcc input=1832ee0a3132cfaf]*/
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{
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PyObject *v, *item;
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datum key, nextkey;
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int err;
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if (self == NULL || !is_dbmobject(self)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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check_dbmobject_open(self);
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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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key = gdbm_firstkey(self->di_dbm);
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while (key.dptr) {
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item = PyBytes_FromStringAndSize(key.dptr, key.dsize);
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if (item == NULL) {
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free(key.dptr);
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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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free(key.dptr);
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Py_DECREF(v);
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return NULL;
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}
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nextkey = gdbm_nextkey(self->di_dbm, key);
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free(key.dptr);
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key = nextkey;
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}
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return v;
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}
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static int
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dbm_contains(PyObject *self, PyObject *arg)
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{
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dbmobject *dp = (dbmobject *)self;
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datum key;
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Py_ssize_t size;
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if ((dp)->di_dbm == NULL) {
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PyErr_SetString(DbmError,
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"GDBM object has already been closed");
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return -1;
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}
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if (PyUnicode_Check(arg)) {
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key.dptr = (char *)PyUnicode_AsUTF8AndSize(arg, &size);
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key.dsize = size;
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if (key.dptr == NULL)
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return -1;
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}
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else if (!PyBytes_Check(arg)) {
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PyErr_Format(PyExc_TypeError,
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"gdbm key must be bytes or string, not %.100s",
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arg->ob_type->tp_name);
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return -1;
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}
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else {
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key.dptr = PyBytes_AS_STRING(arg);
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key.dsize = PyBytes_GET_SIZE(arg);
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}
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return gdbm_exists(dp->di_dbm, key);
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}
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static PySequenceMethods dbm_as_sequence = {
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0, /* sq_length */
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0, /* sq_concat */
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0, /* sq_repeat */
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0, /* sq_item */
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0, /* sq_slice */
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0, /* sq_ass_item */
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0, /* sq_ass_slice */
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dbm_contains, /* sq_contains */
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0, /* sq_inplace_concat */
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0, /* sq_inplace_repeat */
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};
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/*[clinic input]
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_gdbm.gdbm.firstkey
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Return the starting key for the traversal.
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It's possible to loop over every key in the database using this method
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and the nextkey() method. The traversal is ordered by GDBM's internal
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hash values, and won't be sorted by the key values.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_firstkey_impl(dbmobject *self)
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/*[clinic end generated code: output=9ff85628d84b65d2 input=0dbd6a335d69bba0]*/
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{
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PyObject *v;
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datum key;
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check_dbmobject_open(self);
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key = gdbm_firstkey(self->di_dbm);
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if (key.dptr) {
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v = PyBytes_FromStringAndSize(key.dptr, key.dsize);
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free(key.dptr);
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return v;
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}
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else {
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Py_RETURN_NONE;
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}
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}
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/*[clinic input]
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_gdbm.gdbm.nextkey
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key: str(accept={str, robuffer}, zeroes=True)
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/
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Returns the key that follows key in the traversal.
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The following code prints every key in the database db, without having
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to create a list in memory that contains them all:
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k = db.firstkey()
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while k != None:
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print(k)
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k = db.nextkey(k)
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_nextkey_impl(dbmobject *self, const char *key,
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Py_ssize_clean_t key_length)
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/*[clinic end generated code: output=192ab892de6eb2f6 input=1f1606943614e36f]*/
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{
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PyObject *v;
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datum dbm_key, nextkey;
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dbm_key.dptr = (char *)key;
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dbm_key.dsize = key_length;
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check_dbmobject_open(self);
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nextkey = gdbm_nextkey(self->di_dbm, dbm_key);
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if (nextkey.dptr) {
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v = PyBytes_FromStringAndSize(nextkey.dptr, nextkey.dsize);
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free(nextkey.dptr);
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return v;
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}
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else {
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Py_RETURN_NONE;
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}
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}
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/*[clinic input]
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_gdbm.gdbm.reorganize
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Reorganize the database.
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If you have carried out a lot of deletions and would like to shrink
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the space used by the GDBM file, this routine will reorganize the
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database. GDBM will not shorten the length of a database file except
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by using this reorganization; otherwise, deleted file space will be
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kept and reused as new (key,value) pairs are added.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_reorganize_impl(dbmobject *self)
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/*[clinic end generated code: output=38d9624df92e961d input=f6bea85bcfd40dd2]*/
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{
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check_dbmobject_open(self);
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errno = 0;
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if (gdbm_reorganize(self->di_dbm) < 0) {
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if (errno != 0)
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PyErr_SetFromErrno(DbmError);
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else
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PyErr_SetString(DbmError, gdbm_strerror(gdbm_errno));
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return NULL;
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}
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Py_RETURN_NONE;
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}
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/*[clinic input]
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_gdbm.gdbm.sync
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Flush the database to the disk file.
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When the database has been opened in fast mode, this method forces
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any unwritten data to be written to the disk.
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[clinic start generated code]*/
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static PyObject *
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_gdbm_gdbm_sync_impl(dbmobject *self)
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/*[clinic end generated code: output=488b15f47028f125 input=2a47d2c9e153ab8a]*/
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{
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check_dbmobject_open(self);
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gdbm_sync(self->di_dbm);
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Py_RETURN_NONE;
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}
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static PyObject *
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dbm__enter__(PyObject *self, PyObject *args)
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{
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Py_INCREF(self);
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return self;
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}
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static PyObject *
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dbm__exit__(PyObject *self, PyObject *args)
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{
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_Py_IDENTIFIER(close);
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return _PyObject_CallMethodId(self, &PyId_close, NULL);
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}
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static PyMethodDef dbm_methods[] = {
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_GDBM_GDBM_CLOSE_METHODDEF
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_GDBM_GDBM_KEYS_METHODDEF
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_GDBM_GDBM_FIRSTKEY_METHODDEF
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_GDBM_GDBM_NEXTKEY_METHODDEF
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_GDBM_GDBM_REORGANIZE_METHODDEF
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_GDBM_GDBM_SYNC_METHODDEF
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_GDBM_GDBM_GET_METHODDEF
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_GDBM_GDBM_SETDEFAULT_METHODDEF
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{"__enter__", dbm__enter__, METH_NOARGS, NULL},
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{"__exit__", dbm__exit__, METH_VARARGS, NULL},
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{NULL, NULL} /* sentinel */
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};
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static PyTypeObject Dbmtype = {
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PyVarObject_HEAD_INIT(0, 0)
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"_gdbm.gdbm",
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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_vectorcall_offset*/
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|
0, /*tp_getattr*/
|
|
0, /*tp_setattr*/
|
|
0, /*tp_as_async*/
|
|
0, /*tp_repr*/
|
|
0, /*tp_as_number*/
|
|
&dbm_as_sequence, /*tp_as_sequence*/
|
|
&dbm_as_mapping, /*tp_as_mapping*/
|
|
0, /*tp_hash*/
|
|
0, /*tp_call*/
|
|
0, /*tp_str*/
|
|
0, /*tp_getattro*/
|
|
0, /*tp_setattro*/
|
|
0, /*tp_as_buffer*/
|
|
Py_TPFLAGS_DEFAULT, /*tp_xxx4*/
|
|
gdbm_object__doc__, /*tp_doc*/
|
|
0, /*tp_traverse*/
|
|
0, /*tp_clear*/
|
|
0, /*tp_richcompare*/
|
|
0, /*tp_weaklistoffset*/
|
|
0, /*tp_iter*/
|
|
0, /*tp_iternext*/
|
|
dbm_methods, /*tp_methods*/
|
|
};
|
|
|
|
/* ----------------------------------------------------------------- */
|
|
|
|
/*[clinic input]
|
|
_gdbm.open as dbmopen
|
|
filename: unicode
|
|
flags: str="r"
|
|
mode: int(py_default="0o666") = 0o666
|
|
/
|
|
|
|
Open a dbm database and return a dbm object.
|
|
|
|
The filename argument is the name of the database file.
|
|
|
|
The optional flags argument can be 'r' (to open an existing database
|
|
for reading only -- default), 'w' (to open an existing database for
|
|
reading and writing), 'c' (which creates the database if it doesn't
|
|
exist), or 'n' (which always creates a new empty database).
|
|
|
|
Some versions of gdbm support additional flags which must be
|
|
appended to one of the flags described above. The module constant
|
|
'open_flags' is a string of valid additional flags. The 'f' flag
|
|
opens the database in fast mode; altered data will not automatically
|
|
be written to the disk after every change. This results in faster
|
|
writes to the database, but may result in an inconsistent database
|
|
if the program crashes while the database is still open. Use the
|
|
sync() method to force any unwritten data to be written to the disk.
|
|
The 's' flag causes all database operations to be synchronized to
|
|
disk. The 'u' flag disables locking of the database file.
|
|
|
|
The optional mode argument is the Unix mode of the file, used only
|
|
when the database has to be created. It defaults to octal 0o666.
|
|
[clinic start generated code]*/
|
|
|
|
static PyObject *
|
|
dbmopen_impl(PyObject *module, PyObject *filename, const char *flags,
|
|
int mode)
|
|
/*[clinic end generated code: output=9527750f5df90764 input=3be0b0875974b928]*/
|
|
{
|
|
int iflags;
|
|
|
|
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,
|
|
"First flag must be one of 'r', 'w', 'c' or 'n'");
|
|
return NULL;
|
|
}
|
|
for (flags++; *flags != '\0'; flags++) {
|
|
char buf[40];
|
|
switch (*flags) {
|
|
#ifdef GDBM_FAST
|
|
case 'f':
|
|
iflags |= GDBM_FAST;
|
|
break;
|
|
#endif
|
|
#ifdef GDBM_SYNC
|
|
case 's':
|
|
iflags |= GDBM_SYNC;
|
|
break;
|
|
#endif
|
|
#ifdef GDBM_NOLOCK
|
|
case 'u':
|
|
iflags |= GDBM_NOLOCK;
|
|
break;
|
|
#endif
|
|
default:
|
|
PyOS_snprintf(buf, sizeof(buf), "Flag '%c' is not supported.",
|
|
*flags);
|
|
PyErr_SetString(DbmError, buf);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
PyObject *filenamebytes = PyUnicode_EncodeFSDefault(filename);
|
|
if (filenamebytes == NULL) {
|
|
return NULL;
|
|
}
|
|
const char *name = PyBytes_AS_STRING(filenamebytes);
|
|
if (strlen(name) != (size_t)PyBytes_GET_SIZE(filenamebytes)) {
|
|
Py_DECREF(filenamebytes);
|
|
PyErr_SetString(PyExc_ValueError, "embedded null character");
|
|
return NULL;
|
|
}
|
|
PyObject *self = newdbmobject(name, iflags, mode);
|
|
Py_DECREF(filenamebytes);
|
|
return self;
|
|
}
|
|
|
|
static const char dbmmodule_open_flags[] = "rwcn"
|
|
#ifdef GDBM_FAST
|
|
"f"
|
|
#endif
|
|
#ifdef GDBM_SYNC
|
|
"s"
|
|
#endif
|
|
#ifdef GDBM_NOLOCK
|
|
"u"
|
|
#endif
|
|
;
|
|
|
|
static PyMethodDef dbmmodule_methods[] = {
|
|
DBMOPEN_METHODDEF
|
|
{ 0, 0 },
|
|
};
|
|
|
|
|
|
static struct PyModuleDef _gdbmmodule = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"_gdbm",
|
|
gdbmmodule__doc__,
|
|
-1,
|
|
dbmmodule_methods,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit__gdbm(void) {
|
|
PyObject *m;
|
|
|
|
if (PyType_Ready(&Dbmtype) < 0)
|
|
return NULL;
|
|
m = PyModule_Create(&_gdbmmodule);
|
|
if (m == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
DbmError = PyErr_NewException("_gdbm.error", PyExc_OSError, NULL);
|
|
if (DbmError == NULL) {
|
|
goto error;
|
|
}
|
|
Py_INCREF(DbmError);
|
|
if (PyModule_AddObject(m, "error", DbmError) < 0) {
|
|
Py_DECREF(DbmError);
|
|
goto error;
|
|
}
|
|
|
|
if (PyModule_AddStringConstant(m, "open_flags",
|
|
dbmmodule_open_flags) < 0) {
|
|
goto error;
|
|
}
|
|
|
|
#if defined(GDBM_VERSION_MAJOR) && defined(GDBM_VERSION_MINOR) && \
|
|
defined(GDBM_VERSION_PATCH)
|
|
PyObject *obj = Py_BuildValue("iii", GDBM_VERSION_MAJOR,
|
|
GDBM_VERSION_MINOR, GDBM_VERSION_PATCH);
|
|
if (obj == NULL) {
|
|
goto error;
|
|
}
|
|
if (PyModule_AddObject(m, "_GDBM_VERSION", obj) < 0) {
|
|
Py_DECREF(obj);
|
|
goto error;
|
|
}
|
|
#endif
|
|
|
|
return m;
|
|
|
|
error:
|
|
Py_DECREF(m);
|
|
return NULL;
|
|
}
|