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 * $FreeBSD: head/lib/libc/string/wcscoll.c 227753 2011-11-20 14:45:42Z theraven $ 32 */ 33 34 #include <errno.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <wchar.h> 38 #include "collate.h" 39 40 static char *__mbsdup(const wchar_t *); 41 42 /* 43 * Placeholder implementation of wcscoll(). Attempts to use the single-byte 44 * collation ordering where possible, and falls back on wcscmp() in locales 45 * with extended character sets. 46 */ 47 int 48 wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t locale) 49 { 50 char *mbs1, *mbs2; 51 int diff, sverrno; 52 FIX_LOCALE(locale); 53 struct xlocale_collate *table = 54 (struct xlocale_collate*)locale->components[XLC_COLLATE]; 55 56 if (table->__collate_load_error || MB_CUR_MAX > 1) 57 /* 58 * Locale has no special collating order, could not be 59 * loaded, or has an extended character set; do a fast binary 60 * comparison. 61 */ 62 return (wcscmp(ws1, ws2)); 63 64 if ((mbs1 = __mbsdup(ws1)) == NULL || (mbs2 = __mbsdup(ws2)) == NULL) { 65 /* 66 * Out of memory or illegal wide chars; fall back to wcscmp() 67 * but leave errno indicating the error. Callers that don't 68 * check for error will get a reasonable but often slightly 69 * incorrect result. 70 */ 71 sverrno = errno; 72 free(mbs1); 73 errno = sverrno; 74 return (wcscmp(ws1, ws2)); 75 } 76 77 diff = strcoll_l(mbs1, mbs2, locale); 78 sverrno = errno; 79 free(mbs1); 80 free(mbs2); 81 errno = sverrno; 82 83 return (diff); 84 } 85 86 int 87 wcscoll(const wchar_t *ws1, const wchar_t *ws2) 88 { 89 return wcscoll_l(ws1, ws2, __get_locale()); 90 } 91 92 static char * 93 __mbsdup(const wchar_t *ws) 94 { 95 static const mbstate_t initial; 96 mbstate_t st; 97 const wchar_t *wcp; 98 size_t len; 99 char *mbs; 100 101 wcp = ws; 102 st = initial; 103 if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1) 104 return (NULL); 105 if ((mbs = malloc(len + 1)) == NULL) 106 return (NULL); 107 st = initial; 108 wcsrtombs(mbs, &ws, len + 1, &st); 109 110 return (mbs); 111 } 112