1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 1999 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * UTF-8 encoded Unicode parsing routines. For efficiency, we convert
31 * to wide chars only when absolutely needed. The following interfaces
32 * are exported to libslp:
33 *
34 * slp_utf_strchr: same semantics as strchr, but handles UTF-8 strings
35 * slp_fold_space: folds white space around and in between works;
36 * handles UTF-8 strings
37 * slp_strcasecmp: same semantics as strcasecmp, but also folds white
38 * space and attempts locale-specific
39 * case-insensitive comparisons.
40 */
41
42 #include <stdio.h>
43 #include <string.h>
44 #include <widec.h>
45 #include <stdlib.h>
46 #include <syslog.h>
47 #include <slp-internal.h>
48
49 /*
50 * Same semantics as strchr.
51 * Assumes that we start on a char boundry, and that c is a 7-bit
52 * ASCII char.
53 */
slp_utf_strchr(const char * s,char c)54 char *slp_utf_strchr(const char *s, char c) {
55 int len;
56 char *p;
57
58 for (p = (char *)s; *p; p += len) {
59 len = mblen(p, MB_CUR_MAX);
60 if (len == 1 && *p == c)
61 return (p);
62 }
63 return (NULL);
64 }
65
66 /*
67 * folds white space around and in between words.
68 * " aa bb " becomes "aa bb".
69 * returns NULL if it couldn't allocate memory. The caller must free
70 * the result when done.
71 */
slp_fold_space(const char * s)72 static char *slp_fold_space(const char *s) {
73 int len;
74 char *folded, *f;
75
76 if (!(folded = malloc(strlen(s) + 1))) {
77 slp_err(LOG_CRIT, 0, "slp_fold_space", "out of memory");
78 return (NULL);
79 }
80
81 f = folded;
82 for (;;) {
83 /* step 1: skip white space */
84 for (; *s; s++) {
85 len = mblen(s, MB_CUR_MAX);
86 if (len != 1)
87 break;
88 if (!isspace(*s))
89 break;
90 }
91
92 if (!*s) {
93 /* end of string */
94 *f = 0;
95 return (folded);
96 }
97 /* if we are in between words, keep one space */
98 if (f != folded)
99 *f++ = ' ';
100
101 /* step 2: copy into folded until we hit more white space */
102 while (*s) {
103 int i;
104 len = mblen(s, MB_CUR_MAX);
105 if (len == 1 && isspace(*s))
106 break;
107
108 for (i = 0; i < len; i++)
109 *f++ = *s++;
110 }
111 *f = *s;
112 if (!*s++)
113 return (folded);
114 }
115 }
116
117 /*
118 * performs like strcasecmp, but also folds white space before comparing,
119 * and will handle UTF-8 comparisons (including case). Note that the
120 * application's locale must have been set to a UTF-8 locale for this
121 * to work properly.
122 */
slp_strcasecmp(const char * s1,const char * s2)123 int slp_strcasecmp(const char *s1, const char *s2) {
124 int diff = -1;
125 char *p1, *p2;
126 size_t wcslen1, wcslen2;
127 wchar_t *wcs1, *wcs2;
128
129 p1 = p2 = NULL; wcs1 = wcs2 = NULL;
130
131 /* optimization: try simple case first */
132 if (strcasecmp(s1, s2) == 0)
133 return (0);
134
135 /* fold white space, and try again */
136 p1 = slp_fold_space(s1);
137 p2 = slp_fold_space(s2);
138 if (!p1 || !p2)
139 goto cleanup;
140
141 if ((diff = strcasecmp(p1, p2)) == 0)
142 goto cleanup;
143
144 /*
145 * try converting to wide char -- we must be in a locale which
146 * supports the UTF8 codeset for this to work.
147 */
148 if ((wcslen1 = mbstowcs(NULL, p1, 0)) == (size_t)-1)
149 goto cleanup;
150
151 if (!(wcs1 = malloc(sizeof (*wcs1) * (wcslen1 + 1)))) {
152 slp_err(LOG_CRIT, 0, "slp_strcasecmp", "out of memory");
153 goto cleanup;
154 }
155
156 if ((wcslen2 = mbstowcs(NULL, p2, 0)) == (size_t)-1)
157 goto cleanup;
158
159 if (!(wcs2 = malloc(sizeof (*wcs2) * (wcslen2 + 1)))) {
160 slp_err(LOG_CRIT, 0, "slp_strcasecmp", "out of memory");
161 goto cleanup;
162 }
163 if (mbstowcs(wcs1, p1, wcslen1 + 1) == (size_t)-1)
164 goto cleanup;
165 if (mbstowcs(wcs2, p2, wcslen2 + 1) == (size_t)-1)
166 goto cleanup;
167
168 diff = wscasecmp(wcs1, wcs2);
169
170 cleanup:
171 if (p1) free(p1);
172 if (p2) free(p2);
173 if (wcs1) free(wcs1);
174 if (wcs2) free(wcs2);
175 return (diff);
176 }
177