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Annotation of elwix/files/csh/iconv_stub.c, revision 1.2

1.2     ! misho       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: src/bin/csh/iconv_stub.c,v 1.2 2009/10/17 15:53:15 ume Exp $
        !            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: }