1 /*- 2 * Copyright (c) 2002 Tim J. Robbins 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: src/lib/libc/string/wcscoll.c,v 1.3 2004/04/07 09:47:56 tjr Exp $ 27 */ 28 29 #include <errno.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <wchar.h> 33 #include "collate.h" 34 35 static char *__mbsdup(const wchar_t *); 36 37 /* 38 * Placeholder implementation of wcscoll(). Attempts to use the single-byte 39 * collation ordering where possible, and falls back on wcscmp() in locales 40 * with extended character sets. 41 */ 42 int 43 wcscoll(const wchar_t *ws1, const wchar_t *ws2) 44 { 45 char *mbs1, *mbs2; 46 int diff, sverrno; 47 48 if (__collate_load_error || MB_CUR_MAX > 1) 49 /* 50 * Locale has no special collating order, could not be 51 * loaded, or has an extended character set; do a fast binary 52 * comparison. 53 */ 54 return (wcscmp(ws1, ws2)); 55 56 if ((mbs1 = __mbsdup(ws1)) == NULL || (mbs2 = __mbsdup(ws2)) == NULL) { 57 /* 58 * Out of memory or illegal wide chars; fall back to wcscmp() 59 * but leave errno indicating the error. Callers that don't 60 * check for error will get a reasonable but often slightly 61 * incorrect result. 62 */ 63 sverrno = errno; 64 free(mbs1); 65 errno = sverrno; 66 return (wcscmp(ws1, ws2)); 67 } 68 69 diff = strcoll(mbs1, mbs2); 70 sverrno = errno; 71 free(mbs1); 72 free(mbs2); 73 errno = sverrno; 74 75 return (diff); 76 } 77 78 static char * 79 __mbsdup(const wchar_t *ws) 80 { 81 static const mbstate_t initial; 82 mbstate_t st; 83 const wchar_t *wcp; 84 size_t len; 85 char *mbs; 86 87 wcp = ws; 88 st = initial; 89 if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1) 90 return (NULL); 91 if ((mbs = malloc(len + 1)) == NULL) 92 return (NULL); 93 st = initial; 94 wcsrtombs(mbs, &ws, len + 1, &st); 95 96 return (mbs); 97 } 98