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 } 79