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 } 81