Back to index

python3.2  3.2.2
Classes | Defines | Functions | Variables
_dbmmodule.c File Reference
#include "Python.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

Go to the source code of this file.

Classes

struct  dbmobject

Defines

#define PY_SSIZE_T_CLEAN
#define is_dbmobject(v)   (Py_TYPE(v) == &Dbmtype)
#define check_dbmobject_open(v)

Functions

static PyObjectnewdbmobject (char *file, int flags, int mode)
static void dbm_dealloc (register dbmobject *dp)
static Py_ssize_t dbm_length (dbmobject *dp)
static PyObjectdbm_subscript (dbmobject *dp, register PyObject *key)
static int dbm_ass_sub (dbmobject *dp, PyObject *v, PyObject *w)
static PyObjectdbm__close (register dbmobject *dp, PyObject *unused)
static PyObjectdbm_keys (register dbmobject *dp, PyObject *unused)
static int dbm_contains (PyObject *self, PyObject *arg)
static PyObjectdbm_get (register dbmobject *dp, PyObject *args)
static PyObjectdbm_setdefault (register dbmobject *dp, PyObject *args)
static PyObjectdbmopen (PyObject *self, PyObject *args)
PyMODINIT_FUNC PyInit__dbm (void)

Variables

static PyTypeObject Dbmtype
static PyObjectDbmError
static PyMappingMethods dbm_as_mapping
static PySequenceMethods dbm_as_sequence
static PyMethodDef dbm_methods []
static PyMethodDef dbmmodule_methods []
static struct PyModuleDef

Class Documentation

struct dbmobject

Definition at line 35 of file _dbmmodule.c.

Class Members
GDBM_FILE di_dbm
DBM * di_dbm
PyObject_HEAD int di_size

Define Documentation

#define check_dbmobject_open (   v)
Value:
if ((v)->di_dbm == NULL) \
               { PyErr_SetString(DbmError, "DBM object has already been closed"); \
                 return NULL; }

Definition at line 44 of file _dbmmodule.c.

#define is_dbmobject (   v)    (Py_TYPE(v) == &Dbmtype)

Definition at line 43 of file _dbmmodule.c.

Definition at line 5 of file _dbmmodule.c.


Function Documentation

static PyObject* dbm__close ( register dbmobject dp,
PyObject unused 
) [static]

Definition at line 173 of file _dbmmodule.c.

{
    if (dp->di_dbm)
        dbm_close(dp->di_dbm);
    dp->di_dbm = NULL;
    Py_INCREF(Py_None);
    return Py_None;
}

Here is the call graph for this function:

static int dbm_ass_sub ( dbmobject dp,
PyObject v,
PyObject w 
) [static]

Definition at line 122 of file _dbmmodule.c.

{
    datum krec, drec;
    Py_ssize_t tmp_size;

    if ( !PyArg_Parse(v, "s#", &krec.dptr, &tmp_size) ) {
        PyErr_SetString(PyExc_TypeError,
                        "dbm mappings have bytes or string keys only");
        return -1;
    }
    krec.dsize = tmp_size;
    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_SetObject(PyExc_KeyError, v);
            return -1;
        }
    } else {
        if ( !PyArg_Parse(w, "s#", &drec.dptr, &tmp_size) ) {
            PyErr_SetString(PyExc_TypeError,
                 "dbm mappings have byte or string elements only");
            return -1;
        }
        drec.dsize = tmp_size;
        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;
}

Here is the call graph for this function:

static int dbm_contains ( PyObject self,
PyObject arg 
) [static]

Definition at line 211 of file _dbmmodule.c.

{
    dbmobject *dp = (dbmobject *)self;
    datum key, val;

    if ((dp)->di_dbm == NULL) {
        PyErr_SetString(DbmError,
                        "DBM object has already been closed");
         return -1;
    }
    if (PyUnicode_Check(arg)) {
        arg = _PyUnicode_AsDefaultEncodedString(arg, NULL);
        if (arg == NULL)
            return -1;
    }
    if (!PyBytes_Check(arg)) {
        PyErr_Format(PyExc_TypeError,
                     "dbm key must be string, not %.100s",
                     arg->ob_type->tp_name);
        return -1;
    }
    key.dptr = PyBytes_AS_STRING(arg);
    key.dsize = PyBytes_GET_SIZE(arg);
    val = dbm_fetch(dp->di_dbm, key);
    return val.dptr != NULL;
}

Here is the call graph for this function:

static void dbm_dealloc ( register dbmobject dp) [static]

Definition at line 70 of file _dbmmodule.c.

{
    if ( dp->di_dbm )
        dbm_close(dp->di_dbm);
    PyObject_Del(dp);
}

Here is the call graph for this function:

static PyObject* dbm_get ( register dbmobject dp,
PyObject args 
) [static]

Definition at line 252 of file _dbmmodule.c.

{
    datum key, val;
    PyObject *defvalue = Py_None;
    char *tmp_ptr;
    Py_ssize_t tmp_size;

    if (!PyArg_ParseTuple(args, "s#|O:get",
                          &tmp_ptr, &tmp_size, &defvalue))
        return NULL;
    key.dptr = tmp_ptr;
    key.dsize = tmp_size;
    check_dbmobject_open(dp);
    val = dbm_fetch(dp->di_dbm, key);
    if (val.dptr != NULL)
        return PyBytes_FromStringAndSize(val.dptr, val.dsize);
    else {
        Py_INCREF(defvalue);
        return defvalue;
    }
}

Here is the call graph for this function:

static PyObject* dbm_keys ( register dbmobject dp,
PyObject unused 
) [static]

Definition at line 183 of file _dbmmodule.c.

{
    register PyObject *v, *item;
    datum key;
    int err;

    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 = PyBytes_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;
}

Here is the call graph for this function:

static Py_ssize_t dbm_length ( dbmobject dp) [static]

Definition at line 78 of file _dbmmodule.c.

{
    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;
}

Here is the call graph for this function:

static PyObject* dbm_setdefault ( register dbmobject dp,
PyObject args 
) [static]

Definition at line 275 of file _dbmmodule.c.

{
    datum key, val;
    PyObject *defvalue = NULL;
    char *tmp_ptr;
    Py_ssize_t tmp_size;

    if (!PyArg_ParseTuple(args, "s#|O:setdefault",
                          &tmp_ptr, &tmp_size, &defvalue))
        return NULL;
    key.dptr = tmp_ptr;
    key.dsize = tmp_size;
    check_dbmobject_open(dp);
    val = dbm_fetch(dp->di_dbm, key);
    if (val.dptr != NULL)
        return PyBytes_FromStringAndSize(val.dptr, val.dsize);
    if (defvalue == NULL) {
        defvalue = PyBytes_FromStringAndSize(NULL, 0);
        if (defvalue == NULL)
            return NULL;
        val.dptr = NULL;
        val.dsize = 0;
    }
    else {
        if ( !PyArg_Parse(defvalue, "s#", &val.dptr, &tmp_size) ) {
            PyErr_SetString(PyExc_TypeError,
                "dbm mappings have byte string elements only");
            return NULL;
        }
        val.dsize = tmp_size;
        Py_INCREF(defvalue);
    }
    if (dbm_store(dp->di_dbm, key, val, DBM_INSERT) < 0) {
        dbm_clearerr(dp->di_dbm);
        PyErr_SetString(DbmError, "cannot add item to database");
        Py_DECREF(defvalue);
        return NULL;
    }
    return defvalue;
}

Here is the call graph for this function:

static PyObject* dbm_subscript ( dbmobject dp,
register PyObject key 
) [static]

Definition at line 98 of file _dbmmodule.c.

{
    datum drec, krec;
    Py_ssize_t tmp_size;

    if (!PyArg_Parse(key, "s#", &krec.dptr, &tmp_size) )
        return NULL;

    krec.dsize = tmp_size;
    check_dbmobject_open(dp);
    drec = dbm_fetch(dp->di_dbm, krec);
    if ( drec.dptr == 0 ) {
        PyErr_SetObject(PyExc_KeyError, key);
        return NULL;
    }
    if ( dbm_error(dp->di_dbm) ) {
        dbm_clearerr(dp->di_dbm);
        PyErr_SetString(DbmError, "");
        return NULL;
    }
    return PyBytes_FromStringAndSize(drec.dptr, drec.dsize);
}

Here is the call graph for this function:

static PyObject* dbmopen ( PyObject self,
PyObject args 
) [static]

Definition at line 365 of file _dbmmodule.c.

{
    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,
                        "arg 2 to open should be 'r', 'w', 'c', or 'n'");
        return NULL;
    }
    return newdbmobject(name, iflags, mode);
}

Here is the call graph for this function:

static PyObject* newdbmobject ( char *  file,
int  flags,
int  mode 
) [static]

Definition at line 51 of file _dbmmodule.c.

{
    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;
}

Here is the call graph for this function:

Here is the caller graph for this function:

Definition at line 413 of file _dbmmodule.c.

                  {
    PyObject *m, *d, *s;

    if (PyType_Ready(&Dbmtype) < 0)
        return NULL;
    m = PyModule_Create(&_dbmmodule);
    if (m == NULL)
        return NULL;
    d = PyModule_GetDict(m);
    if (DbmError == NULL)
        DbmError = PyErr_NewException("_dbm.error",
                                      PyExc_IOError, NULL);
    s = PyUnicode_FromString(which_dbm);
    if (s != NULL) {
        PyDict_SetItemString(d, "library", s);
        Py_DECREF(s);
    }
    if (DbmError != NULL)
        PyDict_SetItemString(d, "error", DbmError);
    if (PyErr_Occurred()) {
        Py_DECREF(m);
        m = NULL;
    }
    return m;
}

Here is the call graph for this function:


Variable Documentation

Initial value:

Definition at line 166 of file _dbmmodule.c.

Initial value:
 {
    0,                          
    0,                          
    0,                          
    0,                          
    0,                          
    0,                          
    0,                          
    dbm_contains,               
    0,                          
    0,                          
}

Definition at line 238 of file _dbmmodule.c.

Initial value:
 {
    {"close",           (PyCFunction)dbm__close,        METH_NOARGS,
     "close()\nClose the database."},
    {"keys",            (PyCFunction)dbm_keys,          METH_NOARGS,
     "keys() -> list\nReturn a list of all keys in the database."},
    {"get",             (PyCFunction)dbm_get,           METH_VARARGS,
     "get(key[, default]) -> value\n"
     "Return the value for key if present, otherwise default."},
    {"setdefault",      (PyCFunction)dbm_setdefault,    METH_VARARGS,
     "setdefault(key[, default]) -> value\n"
     "Return the value for key if present, otherwise default.  If key\n"
     "is not in the database, it is inserted with default as the value."},
    {NULL,              NULL}           
}

Definition at line 316 of file _dbmmodule.c.

PyObject* DbmError [static]

Definition at line 48 of file _dbmmodule.c.

Initial value:
 {
    { "open", (PyCFunction)dbmopen, METH_VARARGS,
      "open(path[, flag[, mode]]) -> mapping\n"
      "Return a database object."},
    { 0, 0 },
}

Definition at line 392 of file _dbmmodule.c.

static PyTypeObject Dbmtype [static]
Initial value:
 {
    PyVarObject_HEAD_INIT(NULL, 0)
    "_dbm.dbm",
    sizeof(dbmobject),
    0,
    (destructor)dbm_dealloc,  
    0,                            
    0,                        
    0,                            
    0,                            
    0,                            
    0,                            
    &dbm_as_sequence,             
    &dbm_as_mapping,              
    0,                    
    0,                    
    0,                    
    0,                    
    0,                    
    0,                    
    Py_TPFLAGS_DEFAULT,   
    0,                        
    0,                        
    0,                        
    0,                        
    0,                        
    0,                        
    0,                        
    dbm_methods,          
}

Definition at line 41 of file _dbmmodule.c.

struct PyModuleDef [static]
Initial value:

Definition at line 400 of file _dbmmodule.c.