1 /*
2 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
4 * Copyright (c) 2002 Tim J. Robbins
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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <errno.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <wchar.h>
34 #include <assert.h>
35 #include "collate.h"
36 #include "localeimpl.h"
37
38 int
39 wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t loc)
40 {
41 int len1, len2, pri1, pri2, ret;
42 wchar_t *tr1 = NULL, *tr2 = NULL;
43 int direc, pass;
44 const struct lc_collate *lcc = loc->collate;
45
46 if (lcc->lc_is_posix)
47 /*
48 * Locale has no special collating order or could not be
49 * loaded, do a fast binary comparison.
50 */
51 return (wcscmp(ws1, ws2));
52
53 ret = 0;
54
55 /*
56 * Once upon a time we had code to try to optimize this, but
57 * it turns out that you really can't make many assumptions
58 * safely. You absolutely have to run this pass by pass,
59 * because some passes will be ignored for a given character,
60 * while others will not. Simpler locales will benefit from
61 * having fewer passes, and most comparisions should resolve
62 * during the primary pass anyway.
63 *
64 * Note that we do one final extra pass at the end to pick
65 * up UNDEFINED elements. There is special handling for them.
66 */
67 for (pass = 0; pass <= lcc->lc_directive_count; pass++) {
68
69 const int32_t *st1 = NULL;
70 const int32_t *st2 = NULL;
71 const wchar_t *w1 = ws1;
72 const wchar_t *w2 = ws2;
73
74 /* special pass for UNDEFINED */
75 if (pass == lcc->lc_directive_count) {
76 direc = DIRECTIVE_FORWARD | DIRECTIVE_UNDEFINED;
77 } else {
78 direc = lcc->lc_directive[pass];
79 }
80
81 if (direc & DIRECTIVE_BACKWARD) {
82 wchar_t *bp, *fp, c;
83 if ((tr1 = wcsdup(w1)) == NULL)
84 goto fail;
85 bp = tr1;
86 fp = tr1 + wcslen(tr1) - 1;
87 while (bp < fp) {
88 c = *bp;
89 *bp++ = *fp;
90 *fp-- = c;
91 }
92 if ((tr2 = wcsdup(w2)) == NULL)
93 goto fail;
94 bp = tr2;
95 fp = tr2 + wcslen(tr2) - 1;
96 while (bp < fp) {
97 c = *bp;
98 *bp++ = *fp;
99 *fp-- = c;
100 }
101 w1 = tr1;
102 w2 = tr2;
103 }
104
105 if (direc & DIRECTIVE_POSITION) {
106 while ((*w1 || st1) && (*w2 || st2)) {
107 pri1 = pri2 = 0;
108 _collate_lookup(lcc, w1, &len1, &pri1, pass,
109 &st1);
110 if (pri1 <= 0) {
111 if (pri1 < 0) {
112 errno = EINVAL;
113 goto fail;
114 }
115 pri1 = COLLATE_MAX_PRIORITY;
116 }
117 _collate_lookup(lcc, w2, &len2, &pri2, pass,
118 &st2);
119 if (pri2 <= 0) {
120 if (pri2 < 0) {
121 errno = EINVAL;
122 goto fail;
123 }
124 pri2 = COLLATE_MAX_PRIORITY;
125 }
126 if (pri1 != pri2) {
127 ret = pri1 - pri2;
128 goto end;
129 }
130 w1 += len1;
131 w2 += len2;
132 }
133 } else {
134 while ((*w1 || st1) && (*w2 || st2)) {
135 pri1 = pri2 = 0;
136 while (*w1) {
137 _collate_lookup(lcc, w1, &len1,
138 &pri1, pass, &st1);
139 if (pri1 > 0)
140 break;
141 if (pri1 < 0) {
142 errno = EINVAL;
143 goto fail;
144 }
145 w1 += len1;
146 }
147 while (*w2) {
148 _collate_lookup(lcc, w2, &len2,
149 &pri2, pass, &st2);
150 if (pri2 > 0)
151 break;
152 if (pri2 < 0) {
153 errno = EINVAL;
154 goto fail;
155 }
156 w2 += len2;
157 }
158 if (!pri1 || !pri2)
159 break;
160 if (pri1 != pri2) {
161 ret = pri1 - pri2;
162 goto end;
163 }
164 w1 += len1;
165 w2 += len2;
166 }
167 }
168 if (!*w1) {
169 if (*w2) {
170 ret = -(int)*w2;
171 goto end;
172 }
173 } else {
174 ret = *w1;
175 goto end;
176 }
177 }
178 ret = 0;
179
180 end:
181 if (tr1)
182 free(tr1);
183 if (tr2)
184 free(tr2);
185
186 return (ret);
187
188 fail:
189 ret = wcscmp(ws1, ws2);
190 goto end;
191 }
192
193
194 int
195 wcscoll(const wchar_t *ws1, const wchar_t *ws2)
196 {
197 return (wcscoll_l(ws1, ws2, uselocale(NULL)));
198 }