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