1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 5 * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua> 6 * at Electronni Visti IA, Kiev, Ukraine. 7 * All rights reserved. 8 * 9 * Copyright (c) 2011 The FreeBSD Foundation 10 * All rights reserved. 11 * Portions of this software were developed by David Chisnall 12 * under sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <stdlib.h> 40 #include <string.h> 41 #include <errno.h> 42 #include <wchar.h> 43 #include "collate.h" 44 45 46 /* 47 * In order to properly handle multibyte locales, its easiest to just 48 * convert to wide characters and then use wcscoll. However if an 49 * error occurs, we gracefully fall back to simple strcmp. Caller 50 * should check errno. 51 */ 52 int 53 strcoll_l(const char *s, const char *s2, locale_t locale) 54 { 55 int ret; 56 wchar_t *t1 = NULL, *t2 = NULL; 57 wchar_t *w1 = NULL, *w2 = NULL; 58 const char *cs1, *cs2; 59 mbstate_t mbs1; 60 mbstate_t mbs2; 61 size_t sz1, sz2; 62 63 memset(&mbs1, 0, sizeof (mbstate_t)); 64 memset(&mbs2, 0, sizeof (mbstate_t)); 65 66 /* 67 * The mbsrtowcs_l function can set the src pointer to null upon 68 * failure, so it should act on a copy to avoid: 69 * - sending null pointer to strcmp 70 * - having strcoll/strcoll_l change *s or *s2 to null 71 */ 72 cs1 = s; 73 cs2 = s2; 74 75 FIX_LOCALE(locale); 76 struct xlocale_collate *table = 77 (struct xlocale_collate*)locale->components[XLC_COLLATE]; 78 79 if (table->__collate_load_error) 80 goto error; 81 82 sz1 = strlen(s) + 1; 83 sz2 = strlen(s2) + 1; 84 85 /* 86 * Simple assumption: conversion to wide format is strictly 87 * reducing, i.e. a single byte (or multibyte character) 88 * cannot result in multiple wide characters. 89 */ 90 if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL) 91 goto error; 92 w1 = t1; 93 if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL) 94 goto error; 95 w2 = t2; 96 97 if ((mbsrtowcs_l(w1, &cs1, sz1, &mbs1, locale)) == (size_t)-1) 98 goto error; 99 100 if ((mbsrtowcs_l(w2, &cs2, sz2, &mbs2, locale)) == (size_t)-1) 101 goto error; 102 103 ret = wcscoll_l(w1, w2, locale); 104 free(t1); 105 free(t2); 106 107 return (ret); 108 109 error: 110 free(t1); 111 free(t2); 112 return (strcmp(s, s2)); 113 } 114 115 int 116 strcoll(const char *s, const char *s2) 117 { 118 return strcoll_l(s, s2, __get_locale()); 119 } 120 121