lib/libc/string/wcscoll.c

   1 /*-
   2  * Copyright 2017 Nexenta Systems, Inc.
   3  * Copyright (c) 2002 Tim J. Robbins
   4  * All rights reserved.
   5  *
   6  * Copyright (c) 2011 The FreeBSD Foundation
   7  * All rights reserved.
   8  * Portions of this software were developed by David Chisnall
   9  * under sponsorship from the FreeBSD Foundation.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <errno.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <wchar.h>
  40 #include "collate.h"
  41
  42 int
  43 wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t locale)
  44 {
  45         int len1, len2, pri1, pri2;
  46         wchar_t *tr1 = NULL, *tr2 = NULL;
  47         int direc, pass;
  48         int ret = wcscmp(ws1, ws2);
  49
  50         FIX_LOCALE(locale);
  51         struct xlocale_collate *table =
  52                 (struct xlocale_collate*)locale->components[XLC_COLLATE];
  53
  54         if (table->__collate_load_error || ret == 0)
  55                 return (ret);
  56
  57         if (*ws1 == 0 && *ws2 != 0)
  58                 return (-1);
  59         if (*ws1 != 0 && *ws2 == 0)
  60                 return (1);
  61
  62         /*
  63          * Once upon a time we had code to try to optimize this, but
  64          * it turns out that you really can't make many assumptions
  65          * safely.  You absolutely have to run this pass by pass,
  66          * because some passes will be ignored for a given character,
  67          * while others will not.  Simpler locales will benefit from
  68          * having fewer passes, and most comparisons should resolve
  69          * during the primary pass anyway.
  70          *
  71          * Note that we do one final extra pass at the end to pick
  72          * up UNDEFINED elements.  There is special handling for them.
  73          */
  74         for (pass = 0; pass <= table->info->directive_count; pass++) {
  75
  76                 const int32_t *st1 = NULL;
  77                 const int32_t *st2 = NULL;
  78                 const wchar_t   *w1 = ws1;
  79                 const wchar_t   *w2 = ws2;
  80
  81                 /* special pass for UNDEFINED */
  82                 if (pass == table->info->directive_count) {
  83                         direc = DIRECTIVE_FORWARD;
  84                 } else {
  85                         direc = table->info->directive[pass];
  86                 }
  87
  88                 if (direc & DIRECTIVE_BACKWARD) {
  89                         wchar_t *bp, *fp, c;
  90                         free(tr1);
  91                         if ((tr1 = wcsdup(w1)) == NULL)
  92                                 goto end;
  93                         bp = tr1;
  94                         fp = tr1 + wcslen(tr1) - 1;
  95                         while (bp < fp) {
  96                                 c = *bp;
  97                                 *bp++ = *fp;
  98                                 *fp-- = c;
  99                         }
 100                         free(tr2);
 101                         if ((tr2 = wcsdup(w2)) == NULL)
 102                                 goto end;
 103                         bp = tr2;
 104                         fp = tr2 + wcslen(tr2) - 1;
 105                         while (bp < fp) {
 106                                 c = *bp;
 107                                 *bp++ = *fp;
 108                                 *fp-- = c;
 109                         }
 110                         w1 = tr1;
 111                         w2 = tr2;
 112                 }
 113
 114                 if (direc & DIRECTIVE_POSITION) {
 115                         int check1, check2;
 116                         while (*w1 && *w2) {
 117                                 pri1 = pri2 = 0;
 118                                 check1 = check2 = 1;
 119                                 while ((pri1 == pri2) && (check1 || check2)) {
 120                                         if (check1) {
 121                                                 _collate_lookup(table, w1, &len1,
 122                                                     &pri1, pass, &st1);
 123                                                 if (pri1 < 0) {
 124                                                         errno = EINVAL;
 125                                                         goto end;
 126                                                 }
 127                                                 if (!pri1) {
 128                                                         pri1 = COLLATE_MAX_PRIORITY;
 129                                                         st1 = NULL;
 130                                                 }
 131                                                 check1 = (st1 != NULL);
 132                                         }
 133                                         if (check2) {
 134                                                 _collate_lookup(table, w2, &len2,
 135                                                     &pri2, pass, &st2);
 136                                                 if (pri2 < 0) {
 137                                                         errno = EINVAL;
 138                                                         goto end;
 139                                                 }
 140                                                 if (!pri2) {
 141                                                         pri2 = COLLATE_MAX_PRIORITY;
 142                                                         st2 = NULL;
 143                                                 }
 144                                                 check2 = (st2 != NULL);
 145                                         }
 146                                 }
 147                                 if (pri1 != pri2) {
 148                                         ret = pri1 - pri2;
 149                                         goto end;
 150                                 }
 151                                 w1 += len1;
 152                                 w2 += len2;
 153                         }
 154                         if (!*w1) {
 155                                 if (*w2) {
 156                                         ret = -(int)*w2;
 157                                         goto end;
 158                                 }
 159                         } else {
 160                                 ret = *w1;
 161                                 goto end;
 162                         }
 163                 } else {
 164                         int vpri1 = 0, vpri2 = 0;
 165                         while (*w1 || *w2 || st1 || st2) {
 166                                 pri1 = 1;
 167                                 while (*w1 || st1) {
 168                                         _collate_lookup(table, w1, &len1, &pri1,
 169                                             pass, &st1);
 170                                         w1 += len1;
 171                                         if (pri1 > 0) {
 172                                                 vpri1++;
 173                                                 break;
 174                                         }
 175
 176                                         if (pri1 < 0) {
 177                                                 errno = EINVAL;
 178                                                 goto end;
 179                                         }
 180                                         st1 = NULL;
 181                                 }
 182                                 pri2 = 1;
 183                                 while (*w2 || st2) {
 184                                         _collate_lookup(table, w2, &len2, &pri2,
 185                                             pass, &st2);
 186                                         w2 += len2;
 187                                         if (pri2 > 0) {
 188                                                 vpri2++;
 189                                                 break;
 190                                         }
 191                                         if (pri2 < 0) {
 192                                                 errno = EINVAL;
 193                                                 goto end;
 194                                         }
 195                                         st2 = NULL;
 196                                 }
 197                                 if ((!pri1 || !pri2) && (vpri1 == vpri2))
 198                                         break;
 199                                 if (pri1 != pri2) {
 200                                         ret = pri1 - pri2;
 201                                         goto end;
 202                                 }
 203                         }
 204                         if (vpri1 && !vpri2) {
 205                                 ret = 1;
 206                                 goto end;
 207                         }
 208                         if (!vpri1 && vpri2) {
 209                                 ret = -1;
 210                                 goto end;
 211                         }
 212                 }
 213         }
 214         ret = 0;
 215
 216 end:
 217         free(tr1);
 218         free(tr2);
 219
 220         return (ret);
 221 }
 222
 223 int
 224 wcscoll(const wchar_t *ws1, const wchar_t *ws2)
 225 {
 226         return wcscoll_l(ws1, ws2, __get_locale());
 227 }