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/*
* Python binding for the packet.c module.
*
* This file is Copyright (c) 2010 by the GPSD project
* BSD terms apply: see the file COPYING in the distribution root for details.
*
*/
#include <Python.h>
#include <stdio.h>
#include "gpsd.h"
static PyObject *ErrorObject = NULL;
static PyObject *report_callback = NULL;
void gpsd_report(int unused UNUSED, int errlevel, const char *fmt, ... )
{
char buf[BUFSIZ];
PyObject *args;
va_list ap;
if (!report_callback) /* no callback defined, exit early */
return;
if (!PyCallable_Check(report_callback)) {
PyErr_SetString(ErrorObject, "Cannot call Python callback function");
return;
}
va_start(ap, fmt);
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
args = Py_BuildValue("(is)", errlevel, buf);
if (!args)
return;
PyObject_Call(report_callback, args, NULL);
Py_DECREF(args);
}
static PyTypeObject Lexer_Type;
typedef struct {
PyObject_HEAD
struct gps_packet_t lexer;
} LexerObject;
static LexerObject *
newLexerObject(PyObject *arg UNUSED)
{
LexerObject *self;
self = PyObject_New(LexerObject, &Lexer_Type);
if (self == NULL)
return NULL;
memset(&self->lexer, 0, sizeof(struct gps_packet_t));
packet_reset(&self->lexer);
return self;
}
/* Lexer methods */
static int
Lexer_init(LexerObject *self)
{
packet_reset(&self->lexer);
return 0;
}
static PyObject *
Lexer_get(LexerObject *self, PyObject *args)
{
ssize_t len;
int fd;
if (!PyArg_ParseTuple(args, "i;missing or invalid file descriptor argument to gps.packet.get", &fd))
return NULL;
len = packet_get(fd, &self->lexer);
if (PyErr_Occurred())
return NULL;
return Py_BuildValue("(i, i, s#, i)",
len,
self->lexer.type,
self->lexer.outbuffer,
self->lexer.outbuflen,
self->lexer.char_counter);
}
static PyObject *
Lexer_reset(LexerObject *self)
{
packet_reset(&self->lexer);
if (PyErr_Occurred())
return NULL;
return 0;
}
static void
Lexer_dealloc(LexerObject *self)
{
PyObject_Del(self);
}
static PyMethodDef Lexer_methods[] = {
{"get", (PyCFunction)Lexer_get, METH_VARARGS,
PyDoc_STR("Get a packet from a file descriptor.")},
{"reset", (PyCFunction)Lexer_reset, METH_NOARGS,
PyDoc_STR("Reset the packet lexer to ground state.")},
{NULL, NULL} /* sentinel */
};
static PyObject *
Lexer_getattr(LexerObject *self, char *name)
{
return Py_FindMethod(Lexer_methods, (PyObject *)self, name);
}
PyDoc_STRVAR(Lexer__doc__,
"GPS packet lexer object\n\
\n\
Fetch a single packet from file descriptor");
static PyTypeObject Lexer_Type = {
/* The ob_type field must be initialized in the module init function
* to be portable to Windows without using C++. */
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"gps.packet.lexer", /*tp_name*/
sizeof(LexerObject), /*tp_basicsize*/
0, /*tp_itemsize*/
/* methods */
(destructor)Lexer_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)Lexer_getattr, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*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_flags*/
Lexer__doc__, /*tp_doc*/
0, /*tp_traverse*/
0, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
0, /*tp_iter*/
0, /*tp_iternext*/
Lexer_methods, /*tp_methods*/
0, /*tp_members*/
0, /*tp_getset*/
0, /*tp_base*/
0, /*tp_dict*/
0, /*tp_descr_get*/
0, /*tp_descr_set*/
0, /*tp_dictoffset*/
(initproc)Lexer_init, /*tp_init*/
0, /*tp_alloc*/
0, /*tp_new*/
0, /*tp_free*/
0, /*tp_is_gc*/
};
/* Function of no arguments returning new Lexer object */
static PyObject *
gpspacket_new(PyObject *self UNUSED, PyObject *args UNUSED)
{
LexerObject *rv;
if (!PyArg_ParseTuple(args, ":new"))
return NULL;
rv = newLexerObject(args);
if (rv == NULL)
return NULL;
return (PyObject *)rv;
}
PyDoc_STRVAR(register_report__doc__,
"register_report(callback)\n\
\n\
callback must be a callable object expecting a string as parameter.");
static PyObject *
register_report(LexerObject *self UNUSED, PyObject *args)
{
PyObject *callback = NULL;
if (!PyArg_ParseTuple(args, "O:register_report", &callback))
return NULL;
if (!PyCallable_Check(callback)) {
PyErr_SetString(PyExc_TypeError, "First argument must be callable");
return NULL;
}
if (report_callback) {
Py_DECREF(report_callback);
report_callback = NULL;
}
report_callback = callback;
Py_INCREF(report_callback);
Py_INCREF(Py_None);
return Py_None;
}
/* List of functions defined in the module */
static PyMethodDef packet_methods[] = {
{"new", gpspacket_new, METH_VARARGS,
PyDoc_STR("new() -> new packet-lexer object")},
{"register_report", (PyCFunction)register_report, METH_VARARGS,
register_report__doc__},
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(module_doc,
"Python binding of the libgpsd module for recognizing GPS packets.\n\
The new() function returns a new packet-lexer instance. Lexer instances\n\
have two methods:\n\
get() takes a file descriptor argument and returns a tuple consisting of\n\
the integer packet type and string packet value. On end of file it returns\n\
(-1, '').\n\
reset() resets the packet-lexer to its initial state.\n\
The module also has a register_report() function that accepts a callback\n\
for debug message reporting. The callback will get two arguments, the error\n\
level of the message and the message itself.\n\
");
/* banishes a pointless compiler warning */
extern PyMODINIT_FUNC initpacket(void);
PyMODINIT_FUNC
// cppcheck-suppress unusedFunction
initpacket(void)
{
PyObject *m;
if (PyType_Ready(&Lexer_Type) < 0)
return;
/* Create the module and add the functions */
m = Py_InitModule3("packet", packet_methods, module_doc);
PyModule_AddIntConstant(m, "BAD_PACKET", BAD_PACKET);
PyModule_AddIntConstant(m, "COMMENT_PACKET", COMMENT_PACKET);
PyModule_AddIntConstant(m, "NMEA_PACKET", NMEA_PACKET);
PyModule_AddIntConstant(m, "AIVDM_PACKET", AIVDM_PACKET);
PyModule_AddIntConstant(m, "GARMINTXT_PACKET", GARMINTXT_PACKET);
PyModule_AddIntConstant(m, "SIRF_PACKET", SIRF_PACKET);
PyModule_AddIntConstant(m, "ZODIAC_PACKET", ZODIAC_PACKET);
PyModule_AddIntConstant(m, "TSIP_PACKET", TSIP_PACKET);
PyModule_AddIntConstant(m, "EVERMORE_PACKET", EVERMORE_PACKET);
PyModule_AddIntConstant(m, "ITALK_PACKET", ITALK_PACKET);
PyModule_AddIntConstant(m, "GARMIN_PACKET", GARMIN_PACKET);
PyModule_AddIntConstant(m, "NAVCOM_PACKET", NAVCOM_PACKET);
PyModule_AddIntConstant(m, "UBX_PACKET", UBX_PACKET);
PyModule_AddIntConstant(m, "SUPERSTAR2_PACKET", SUPERSTAR2_PACKET);
PyModule_AddIntConstant(m, "ONCORE_PACKET", ONCORE_PACKET);
PyModule_AddIntConstant(m, "GEOSTAR_PACKET", GEOSTAR_PACKET);
PyModule_AddIntConstant(m, "RTCM2_PACKET", RTCM2_PACKET);
PyModule_AddIntConstant(m, "RTCM3_PACKET", RTCM3_PACKET);
PyModule_AddIntConstant(m, "JSON_PACKET", JSON_PACKET);
PyModule_AddIntConstant(m, "LOG_ERROR", LOG_ERROR);
PyModule_AddIntConstant(m, "LOG_SHOUT", LOG_SHOUT);
PyModule_AddIntConstant(m, "LOG_WARN", LOG_WARN);
PyModule_AddIntConstant(m, "LOG_CLIENT", LOG_CLIENT);
PyModule_AddIntConstant(m, "LOG_INF", LOG_INF);
PyModule_AddIntConstant(m, "LOG_PROG", LOG_PROG);
PyModule_AddIntConstant(m, "LOG_IO", LOG_IO);
PyModule_AddIntConstant(m, "LOG_DATA", LOG_DATA);
PyModule_AddIntConstant(m, "LOG_SPIN", LOG_SPIN);
PyModule_AddIntConstant(m, "LOG_RAW", LOG_RAW);
}
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