1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* $Id: plugin_python.c 728 2007-01-14 11:14:38Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/branches/0.10.1/plugin_python.c $
*
* Python plugin
*
* Copyright 2005 Dan Fritz
* Copyright 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int plugin_init_python (void)
* adds a python interpreter
*
*/
#include <Python.h>
#include "debug.h"
#include "plugin.h"
/*
* Executes a python function specified by function name and module.
*
* This method is more or less a copy of an example found in the python
* documentation. Kudos goes to Guido van Rossum and Fred L. Drake.
*
* Fixme: this function should be able to accept and receive any types
* of arguments supported by the evaluator. Right now only strings are accepted.
*/
static void pyt_exec_str(RESULT * result, const char *module, const char *function, int argc, const char *argv[])
{
PyObject *pName, *pModule, *pDict, *pFunc;
PyObject *pArgs, *pValue;
const char *rv = NULL;
int i;
pName = PyString_FromString(module);
/* Error checking of pName left out */
pModule = PyImport_Import(pName);
Py_DECREF(pName);
if (pModule != NULL) {
pDict = PyModule_GetDict(pModule);
/* pDict is a borrowed reference */
pFunc = PyDict_GetItemString(pDict, function);
/* pFun: Borrowed reference */
if (pFunc && PyCallable_Check(pFunc)) {
pArgs = PyTuple_New(argc);
for (i = 0; i < argc; ++i) {
pValue = PyString_FromString(argv[i]);
if (!pValue) {
Py_DECREF(pArgs);
Py_DECREF(pModule);
error("Cannot convert argument \"%s\" to python format", argv[i]);
SetResult(&result, R_STRING, "");
return;
}
/* pValue reference stolen here: */
PyTuple_SetItem(pArgs, i, pValue);
}
pValue = PyObject_CallObject(pFunc, pArgs);
Py_DECREF(pArgs);
if (pValue != NULL) {
rv = PyString_AsString(pValue);
SetResult(&result, R_STRING, rv);
Py_DECREF(pValue);
/* rv is now a 'dangling reference' */
return;
} else {
Py_DECREF(pModule);
error("Python call failed (\"%s.%s\")", module, function);
SetResult(&result, R_STRING, "");
return;
}
/* pDict and pFunc are borrowed and must not be Py_DECREF-ed */
} else {
error("Can not find python function \"%s.%s\"", module, function);
}
Py_DECREF(pModule);
} else {
error("Failed to load python module \"%s\"", module);
}
SetResult(&result, R_STRING, "");
return;
}
static int python_cleanup_responsibility = 0;
static void my_exec(RESULT * result, RESULT * module, RESULT * function, RESULT * arg)
{
/* Fixme: a plugin should be able to accept any number of arguments, don't know how
to code that (yet) */
const char *args[] = { R2S(arg) };
pyt_exec_str(result, R2S(module), R2S(function), 1, args);
}
int plugin_init_python(void)
{
if (!Py_IsInitialized()) {
Py_Initialize();
python_cleanup_responsibility = 1;
}
AddFunction("python::exec", 3, my_exec);
return 0;
}
void plugin_exit_python(void)
{
/* Make sure NOT to call Py_Finalize() When (and if) the entire lcd4linux process
* is started from inside python
*/
if (python_cleanup_responsibility) {
python_cleanup_responsibility = 0;
Py_Finalize();
}
}
|
