iconv_stub.c revision 297585 
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 * $FreeBSD: stable/10/bin/csh/iconv_stub.c 297585 2016-04-05 14:41:34Z ume $
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
43typedef iconv_t iconv_open_t(const char *, const char *);
44
45dl_iconv_t *dl_iconv;
46dl_iconv_close_t *dl_iconv_close;
47
48static int initialized;
49static void *iconvlib;
50static iconv_open_t *iconv_open;
51
52iconv_t
53dl_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
76dlfunc_err:
77	dlclose(iconvlib);
78	iconvlib = NULL;
79	return (iconv_t)-1;
80}
81