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[FreeBSD/stable/10.git] / bin / csh / iconv_stub.c
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  * $FreeBSD$
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    "iconv"
40 #define ICONV_OPEN      "iconv_open"
41 #define ICONV_CLOSE     "iconv_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
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 }