1 /* 2 * Copyright 2013 Garrett D'Amore <garrett@damore.org> 3 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 4 * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua> 5 * at Electronni Visti IA, Kiev, Ukraine. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include "lint.h" 31 #include "file64.h" 32 #include <alloca.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <errno.h> 36 #include <wchar.h> 37 #include <xlocale.h> 38 #include "localeimpl.h" 39 #include "collate.h" 40 41 #define ALLOCA_LIMIT 16 42 43 /* 44 * In order to properly handle multibyte locales, its easiet to just 45 * convert to wide characters and then use wcscoll. However if an 46 * error occurs, we gracefully fall back to simple strcmp. Caller 47 * should check errno. 48 */ 49 int 50 strcoll_l(const char *s1, const char *s2, locale_t loc) 51 { 52 int ret; 53 wchar_t *t1 = NULL, *t2 = NULL; 54 wchar_t *w1 = NULL, *w2 = NULL; 55 size_t sz1, sz2; 56 const struct lc_collate *lcc = loc->collate; 57 58 if (lcc->lc_is_posix) 59 return (strcmp(s1, s2)); 60 61 sz1 = strlen(s1) + 1; 62 sz2 = strlen(s2) + 1; 63 64 /* 65 * Simple assumption: conversion to wide format is strictly 66 * reducing, i.e. a single byte (or multibyte character) 67 * cannot result in multiple wide characters. 68 * 69 * We gain a bit of performance by giving preference to alloca 70 * for small string allocations. 71 */ 72 if (sz1 > ALLOCA_LIMIT) { 73 if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL) 74 goto error; 75 w1 = t1; 76 } else { 77 if ((w1 = alloca(sz1 * sizeof (wchar_t))) == NULL) 78 goto error; 79 } 80 if (sz2 > ALLOCA_LIMIT) { 81 if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL) 82 goto error; 83 w2 = t2; 84 } else { 85 if ((w2 = alloca(sz2 * sizeof (wchar_t))) == NULL) 86 goto error; 87 } 88 89 if ((mbstowcs_l(w1, s1, sz1, loc)) == (size_t)-1) 90 goto error; 91 92 if ((mbstowcs_l(w2, s2, sz2, loc)) == (size_t)-1) 93 goto error; 94 95 ret = wcscoll_l(w1, w2, loc); 96 if (t1) 97 free(t1); 98 if (t2) 99 free(t2); 100 101 return (ret); 102 103 error: 104 if (t1) 105 free(t1); 106 if (t2) 107 free(t2); 108 return (strcmp(s1, s2)); 109 } 110 111 int 112 strcoll(const char *s1, const char *s2) 113 { 114 return (strcoll_l(s1, s2, uselocale(NULL))); 115 } 116