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
|
/* $Id: plugin_iconv.c 1136 2010-11-28 16:07:16Z mzuther $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_iconv.c $
*
* iconv charset conversion plugin
*
* Copyright (C) 2006 Ernst Bachmann <e.bachmann@xebec.de>
* Copyright (C) 2006 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_iconv (void)
* int plugin_exit_iconv (void)
*
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <iconv.h>
#include <errno.h>
/* these should always be included */
#include "debug.h"
#include "plugin.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
/* iconv function, convert charsets */
/* valid "to" and "from" charsets can be listed by running "iconv --list" from a shell */
/* utf16 & utf32 encodings won't work, as they contain null bytes, confusing strlen */
static void my_iconv(RESULT * result, RESULT * charset_from, RESULT * charset_to, RESULT * arg)
{
char *source;
size_t source_left;
char *dest;
char *dest_pos;
size_t dest_left;
iconv_t cd;
source = R2S(arg);
source_left = strlen(source);
/* use twice the memory needed in best case, but save lots of reallocs in worst case */
/* increase to 4 if most conversions are to utf32 (quite unlikely) */
/* also alloc a "safety byte" so we can always zero-terminate the string. */
dest_left = 2 * source_left;
dest = malloc(dest_left + 1);
dest_pos = dest;
cd = iconv_open(R2S(charset_to), R2S(charset_from));
if (cd != (iconv_t) (-1)) {
do {
/* quite spammy: debug("plugin_iconv: calling iconv with %ld,[%s]/%ld,%ld", cd, source, source_left, dest_left); */
if (iconv(cd, &source, &source_left, &dest_pos, &dest_left) == (size_t) (-1)) {
switch (errno) {
case EILSEQ:
/* illegal bytes in input sequence */
/* try to fix by skipping a byte */
info("plugin_iconv: illegal character in input string: %c", *source);
source_left--;
source++;
break;
case EINVAL:
/* input string ends during a multibyte sequence */
/* try to fix by simply ignoring */
info("plugin_iconv: illegal character at end of input");
source_left = 0;
break;
case E2BIG:
/* not enough bytes in outbuf. */
/* TODO: Realloc output buffer, probably doubling its size? */
/* for now, just bail out. For lcd4linux 99% of all conversions will go to ascii or latin1 anyways */
error
("plugin_iconv: out of memory in destination buffer. Seems like Ernst was too lazy, complain to him!");
source_left = 0;
break;
default:
error("plugin_iconv: strange errno state (%d) occurred", errno);
source_left = 0;
}
}
} while (source_left > 0); /* don't check for == 0, could be negative in EILSEQ case */
/* terminate the string, we're sure to have that byte left, see above */
*dest_pos = 0;
dest_pos++;
iconv_close(cd);
} else {
error("plugin_iconv: could not open conversion descriptor. Check if your charsets are supported!");
/* guaranteed to fit. */
strcpy(dest, source);
}
SetResult(&result, R_STRING, dest);
free(dest);
}
/* plugin initialization */
int plugin_init_iconv(void)
{
AddFunction("iconv", 3, my_iconv);
return 0;
}
void plugin_exit_iconv(void)
{
/* nothing to clean */
}
|
