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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/* $Id: plugin_sample.c 1091 2010-01-21 04:26:24Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_sample.c $
*
* plugin template
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004, 2005, 2006, 2007, 2008 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_sample (void)
* adds various functions
*
*/
#include "config.h"
/* these should always be included */
#include "debug.h"
#include "plugin.h"
/* define the include files you need */
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
/* sample function 'mul2' */
/* takes one argument, a number */
/* multiplies the number by 2.0 */
/* Note: all local functions should be declared 'static' */
static void my_mul2(RESULT * result, RESULT * arg1)
{
double param;
double value;
/* Get Parameter */
/* R2N stands for 'Result to Number' */
param = R2N(arg1);
/* calculate value */
value = param * 2.0;
/* store result */
/* when called with R_NUMBER, it assumes the */
/* next parameter to be a pointer to double */
SetResult(&result, R_NUMBER, &value);
}
/* sample function 'mul3' */
/* takes one argument, a number */
/* multiplies the number by 3.0 */
/* same as 'mul2', but shorter */
static void my_mul3(RESULT * result, RESULT * arg1)
{
/* do it all in one line */
double value = R2N(arg1) * 3.0;
/* store result */
SetResult(&result, R_NUMBER, &value);
}
/* sample function 'diff' */
/* takes two arguments, both numbers */
/* returns |a-b| */
static void my_diff(RESULT * result, RESULT * arg1, RESULT * arg2)
{
/* do it all in one line */
double value = R2N(arg1) - R2N(arg2);
/* some more calculations... */
if (value < 0)
value = -value;
/* store result */
SetResult(&result, R_NUMBER, &value);
}
/* sample function 'answer' */
/* takes no argument! */
/* returns the answer to all questions */
static void my_answer(RESULT * result)
{
/* we have to declare a variable because */
/* SetResult needs a pointer */
double value = 42;
/* store result */
SetResult(&result, R_NUMBER, &value);
}
/* sample function 'length' */
/* takes one argument, a string */
/* returns the string length */
static void my_length(RESULT * result, RESULT * arg1)
{
/* Note #1: value *must* be double! */
/* Note #2: R2S stands for 'Result to String' */
double value = strlen(R2S(arg1));
/* store result */
SetResult(&result, R_NUMBER, &value);
}
/* sample function 'upcase' */
/* takes one argument, a string */
/* returns the string in upper case letters */
static void my_upcase(RESULT * result, RESULT * arg1)
{
char *value, *p;
/* create a local copy of the argument */
/* Do *NOT* try to modify the original string! */
value = strdup(R2S(arg1));
/* process the string */
for (p = value; *p != '\0'; p++)
*p = toupper(*p);
/* store result */
/* when called with R_STRING, it assumes the */
/* next parameter to be a pointer to a string */
/* 'value' is already a char*, so use 'value', not '&value' */
SetResult(&result, R_STRING, value);
/* free local copy again */
/* Note that SetResult() makes its own string copy */
free(value);
}
/* sample function 'cat' */
/* takes variable number of arguments, all strings */
/* returns all prameters concatenated */
static void my_concat(RESULT * result, int argc, RESULT * argv[])
{
int i, len;
char *value, *part;
/* start with a empty string */
value = strdup("");
/* process all arguments */
for (i = 0; i < argc; i++) {
part = R2S(argv[i]);
len = strlen(value) + strlen(part);
value = realloc(value, len + 1);
strcat(value, part);
}
/* store result */
SetResult(&result, R_STRING, value);
/* free local string */
free(value);
}
/* plugin initialization */
/* MUST NOT be declared 'static'! */
int plugin_init_sample(void)
{
/* register all our cool functions */
/* the second parameter is the number of arguments */
/* -1 stands for variable argument list */
AddFunction("sample::mul2", 1, my_mul2);
AddFunction("sample::mul3", 1, my_mul3);
AddFunction("sample::answer", 0, my_answer);
AddFunction("sample::diff", 2, my_diff);
AddFunction("sample::length", 1, my_length);
AddFunction("sample::upcase", 1, my_upcase);
AddFunction("sample::concat", -1, my_concat);
return 0;
}
void plugin_exit_sample(void)
{
/* free any allocated memory */
/* close filedescriptors */
}
|
