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                 dl_iconv = (dl_iconv_t *)dlfunc(iconvlib, ICONV_ENGINE);
  65                 dl_iconv_close = (dl_iconv_close_t *)dlfunc(iconvlib,
  66                     ICONV_CLOSE);
  67         }
  68         return iconv_open(tocode, fromcode);
  69 }