1 /*-
2 * Copyright (c) 2006 Hajimu UMEMOTO <ume@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <dlfcn.h>
28 #include <stddef.h>
29
30 #include "iconv.h"
31
32 #undef iconv_open
33 #undef iconv
34 #undef iconv_close
35
36 #define ICONVLIB "libiconv.so"
37 #define ICONV_ENGINE "libiconv"
38 #define ICONV_OPEN "libiconv_open"
39 #define ICONV_CLOSE "libiconv_close"
40
41 typedef iconv_t iconv_open_t(const char *, const char *);
42
43 dl_iconv_t *dl_iconv;
44 dl_iconv_close_t *dl_iconv_close;
45
46 static int initialized;
47 static void *iconvlib;
48 static iconv_open_t *iconv_open;
49
50 iconv_t
dl_iconv_open(const char * tocode,const char * fromcode)51 dl_iconv_open(const char *tocode, const char *fromcode)
52 {
53 if (initialized) {
54 if (iconvlib == NULL)
55 return (iconv_t)-1;
56 } else {
57 initialized = 1;
58 iconvlib = dlopen(ICONVLIB, RTLD_LAZY | RTLD_GLOBAL);
59 if (iconvlib == NULL)
60 return (iconv_t)-1;
61 iconv_open = (iconv_open_t *)dlfunc(iconvlib, ICONV_OPEN);
62 if (iconv_open == NULL)
63 goto dlfunc_err;
64 dl_iconv = (dl_iconv_t *)dlfunc(iconvlib, ICONV_ENGINE);
65 if (dl_iconv == NULL)
66 goto dlfunc_err;
67 dl_iconv_close = (dl_iconv_close_t *)dlfunc(iconvlib,
68 ICONV_CLOSE);
69 if (dl_iconv_close == NULL)
70 goto dlfunc_err;
71 }
72 return iconv_open(tocode, fromcode);
73
74 dlfunc_err:
75 dlclose(iconvlib);
76 iconvlib = NULL;
77 return (iconv_t)-1;
78 }
79