1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 Hajimu UMEMOTO <ume@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <dlfcn.h>
30 #include <stddef.h>
31
32 #include "iconv.h"
33
34 #undef iconv_open
35 #undef iconv
36 #undef iconv_close
37
38 #define ICONVLIB "libiconv.so"
39 #define ICONV_ENGINE "libiconv"
40 #define ICONV_OPEN "libiconv_open"
41 #define ICONV_CLOSE "libiconv_close"
42
43 typedef iconv_t iconv_open_t(const char *, const char *);
44
45 dl_iconv_t *dl_iconv;
46 dl_iconv_close_t *dl_iconv_close;
47
48 static int initialized;
49 static void *iconvlib;
50 static iconv_open_t *iconv_open;
51
52 iconv_t
dl_iconv_open(const char * tocode,const char * fromcode)53 dl_iconv_open(const char *tocode, const char *fromcode)
54 {
55 if (initialized) {
56 if (iconvlib == NULL)
57 return (iconv_t)-1;
58 } else {
59 initialized = 1;
60 iconvlib = dlopen(ICONVLIB, RTLD_LAZY | RTLD_GLOBAL);
61 if (iconvlib == NULL)
62 return (iconv_t)-1;
63 iconv_open = (iconv_open_t *)dlfunc(iconvlib, ICONV_OPEN);
64 if (iconv_open == NULL)
65 goto dlfunc_err;
66 dl_iconv = (dl_iconv_t *)dlfunc(iconvlib, ICONV_ENGINE);
67 if (dl_iconv == NULL)
68 goto dlfunc_err;
69 dl_iconv_close = (dl_iconv_close_t *)dlfunc(iconvlib,
70 ICONV_CLOSE);
71 if (dl_iconv_close == NULL)
72 goto dlfunc_err;
73 }
74 return iconv_open(tocode, fromcode);
75
76 dlfunc_err:
77 dlclose(iconvlib);
78 iconvlib = NULL;
79 return (iconv_t)-1;
80 }
81