1 /*- 2 * Copyright (c) 2002 Tim J. Robbins 3 * All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <errno.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <wchar.h> 39 #include "collate.h" 40 41 static char *__mbsdup(const wchar_t *); 42 43 /* 44 * Placeholder implementation of wcscoll(). Attempts to use the single-byte 45 * collation ordering where possible, and falls back on wcscmp() in locales 46 * with extended character sets. 47 */ 48 int 49 wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t locale) 50 { 51 char *mbs1, *mbs2; 52 int diff, sverrno; 53 FIX_LOCALE(locale); 54 struct xlocale_collate *table = 55 (struct xlocale_collate*)locale->components[XLC_COLLATE]; 56 57 if (table->__collate_load_error || MB_CUR_MAX > 1) 58 /* 59 * Locale has no special collating order, could not be 60 * loaded, or has an extended character set; do a fast binary 61 * comparison. 62 */ 63 return (wcscmp(ws1, ws2)); 64 65 if ((mbs1 = __mbsdup(ws1)) == NULL || (mbs2 = __mbsdup(ws2)) == NULL) { 66 /* 67 * Out of memory or illegal wide chars; fall back to wcscmp() 68 * but leave errno indicating the error. Callers that don't 69 * check for error will get a reasonable but often slightly 70 * incorrect result. 71 */ 72 sverrno = errno; 73 free(mbs1); 74 errno = sverrno; 75 return (wcscmp(ws1, ws2)); 76 } 77 78 diff = strcoll_l(mbs1, mbs2, locale); 79 sverrno = errno; 80 free(mbs1); 81 free(mbs2); 82 errno = sverrno; 83 84 return (diff); 85 } 86 87 int 88 wcscoll(const wchar_t *ws1, const wchar_t *ws2) 89 { 90 return wcscoll_l(ws1, ws2, __get_locale()); 91 } 92 93 static char * 94 __mbsdup(const wchar_t *ws) 95 { 96 static const mbstate_t initial; 97 mbstate_t st; 98 const wchar_t *wcp; 99 size_t len; 100 char *mbs; 101 102 wcp = ws; 103 st = initial; 104 if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1) 105 return (NULL); 106 if ((mbs = malloc(len + 1)) == NULL) 107 return (NULL); 108 st = initial; 109 wcsrtombs(mbs, &ws, len + 1, &st); 110 111 return (mbs); 112 } 113