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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <errno.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <wchar.h> 34 #include "collate.h" 35 36 static char *__mbsdup(const wchar_t *); 37 38 /* 39 * Placeholder implementation of wcscoll(). Attempts to use the single-byte 40 * collation ordering where possible, and falls back on wcscmp() in locales 41 * with extended character sets. 42 */ 43 int 44 wcscoll(const wchar_t *ws1, const wchar_t *ws2) 45 { 46 char *mbs1, *mbs2; 47 int diff, sverrno; 48 49 if (__collate_load_error || MB_CUR_MAX > 1) 50 /* 51 * Locale has no special collating order, could not be 52 * loaded, or has an extended character set; do a fast binary 53 * comparison. 54 */ 55 return (wcscmp(ws1, ws2)); 56 57 if ((mbs1 = __mbsdup(ws1)) == NULL || (mbs2 = __mbsdup(ws2)) == NULL) { 58 /* 59 * Out of memory or illegal wide chars; fall back to wcscmp() 60 * but leave errno indicating the error. Callers that don't 61 * check for error will get a reasonable but often slightly 62 * incorrect result. 63 */ 64 sverrno = errno; 65 free(mbs1); 66 errno = sverrno; 67 return (wcscmp(ws1, ws2)); 68 } 69 70 diff = strcoll(mbs1, mbs2); 71 sverrno = errno; 72 free(mbs1); 73 free(mbs2); 74 errno = sverrno; 75 76 return (diff); 77 } 78 79 static char * 80 __mbsdup(const wchar_t *ws) 81 { 82 static const mbstate_t initial; 83 mbstate_t st; 84 const wchar_t *wcp; 85 size_t len; 86 char *mbs; 87 88 wcp = ws; 89 st = initial; 90 if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1) 91 return (NULL); 92 if ((mbs = malloc(len + 1)) == NULL) 93 return (NULL); 94 st = initial; 95 wcsrtombs(mbs, &ws, len + 1, &st); 96 97 return (mbs); 98 } 99