plugin_string.c


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

/* $Id$
 * $URL$
 *
 * string plugin
 *
 * Copyright (C) 2003, 2004 Michael Reinelt <michael@reinelt.co.at>
 * Copyright (C) 2004 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_string (void)
 *  adds some handy string functions
 *
 */


#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "debug.h"
#include "plugin.h"


static void my_strlen(RESULT * result, RESULT * arg1)
{
    double value = strlen(R2S(arg1));
    SetResult(&result, R_NUMBER, &value);
}

/* 'upcase' function (shamelessly stolen from plugin_sample.c)*/
/* returns the string in upper case letters */
static void my_strupper(RESULT * result, RESULT * arg1)
{
    char *value, *p;

    value = strdup(R2S(arg1));

    for (p = value; *p != '\0'; p++)
	*p = toupper(*p);

    SetResult(&result, R_STRING, value);
    free(value);
}

static void my_strstr(RESULT * result, RESULT * arg1, RESULT * arg2)
{
    char *p;
    double value;

    char *haystack = R2S(arg1);
    char *needle = R2S(arg2);

    p = strstr(haystack, needle);

    if (p == NULL) {
	value = -1;
    } else {
	value = p - haystack;
    }

    SetResult(&result, R_NUMBER, &value);
}

static void my_substr(RESULT * result, int argc, RESULT * argv[])
{
    char *str, *p1, *p2;
    int pos, len;

    if (argc < 2 || argc > 3) {
	error("substr(): wrong number of parameters");
	SetResult(&result, R_STRING, "");
	return;
    }

    str = strdup(R2S(argv[0]));

    pos = R2N(argv[1]);
    if (pos < 0)
	pos = 0;

    if (argc == 3) {
	len = R2N(argv[2]);
	if (len < 0)
	    len = 0;
    } else {
	len = -1;
    }

    p1 = str;
    while (pos > 0 && *p1 != '\0') {
	p1++;
	pos--;
    }

    if (len >= 0) {
	p2 = p1;
	while (len > 0 && *p2 != '\0') {
	    p2++;
	    len--;
	}
	*p2 = '\0';
    }

    SetResult(&result, R_STRING, p1);
    free(str);
}

int plugin_init_string(void)
{

    /* register some basic string functions */
    AddFunction("strlen", 1, my_strlen);
    AddFunction("strupper", 1, my_strupper);
    AddFunction("strstr", 2, my_strstr);
    AddFunction("substr", -1, my_substr);
    return 0;
}

void plugin_exit_string(void)
{
    /* empty */
}