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
  27 #include <dlfcn.h>
  28 #include <stddef.h>
  29
  30 #include "iconv.h"
  31
  32 #undef iconv_open
  33 #undef iconv
  34 #undef iconv_close
  35
  36 #define ICONVLIB        "libiconv.so"
  37 #define ICONV_ENGINE    "libiconv"
  38 #define ICONV_OPEN      "libiconv_open"
  39 #define ICONV_CLOSE     "libiconv_close"
  40
  41 typedef iconv_t iconv_open_t(const char *, const char *);
  42
  43 dl_iconv_t *dl_iconv;
  44 dl_iconv_close_t *dl_iconv_close;
  45
  46 static int initialized;
  47 static void *iconvlib;
  48 static iconv_open_t *iconv_open;
  49
  50 iconv_t
  51 dl_iconv_open(const char *tocode, const char *fromcode)
  52 {
  53         if (initialized) {
  54                 if (iconvlib == NULL)
  55                         return (iconv_t)-1;
  56         } else {
  57                 initialized = 1;
  58                 iconvlib = dlopen(ICONVLIB, RTLD_LAZY | RTLD_GLOBAL);
  59                 if (iconvlib == NULL)
  60                         return (iconv_t)-1;
  61                 iconv_open = (iconv_open_t *)dlfunc(iconvlib, ICONV_OPEN);
  62                 if (iconv_open == NULL)
  63                         goto dlfunc_err;
  64                 dl_iconv = (dl_iconv_t *)dlfunc(iconvlib, ICONV_ENGINE);
  65                 if (dl_iconv == NULL)
  66                         goto dlfunc_err;
  67                 dl_iconv_close = (dl_iconv_close_t *)dlfunc(iconvlib,
  68                     ICONV_CLOSE);
  69                 if (dl_iconv_close == NULL)
  70                         goto dlfunc_err;
  71         }
  72         return iconv_open(tocode, fromcode);
  73
  74 dlfunc_err:
  75         dlclose(iconvlib);
  76         iconvlib = NULL;
  77         return (iconv_t)-1;
  78 }