5158 sed dumps core in new multibyte code
[illumos-gate.git] / usr / src / lib / libc / port / locale / strncasecmp.c
blob32ae17c8a2cf1835dec70cf57f0f1d1367310d78
1 /*
2 * CDDL HEADER START
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
19 * CDDL HEADER END
23 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
24 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
35 #include "lint.h"
36 #include <sys/types.h>
37 #include <strings.h>
38 #include <ctype.h>
39 #include <locale.h>
40 #include "lctype.h"
41 #include "localeimpl.h"
43 int
44 strncasecmp_l(const char *s1, const char *s2, size_t n, locale_t loc)
46 extern int ascii_strncasecmp(const char *s1, const char *s2, size_t n);
47 const int *cm;
48 const uchar_t *us1;
49 const uchar_t *us2;
50 const struct lc_ctype *lct = loc->ctype;
53 * If we are in a locale that uses the ASCII character set
54 * (C or POSIX), use the fast ascii_strncasecmp() function.
56 if (lct->lc_is_ascii)
57 return (ascii_strncasecmp(s1, s2, n));
59 cm = lct->lc_trans_lower;
60 us1 = (const uchar_t *)s1;
61 us2 = (const uchar_t *)s2;
63 while (n != 0 && cm[*us1] == cm[*us2++]) {
64 if (*us1++ == '\0')
65 return (0);
66 n--;
68 return (n == 0 ? 0 : cm[*us1] - cm[*(us2 - 1)]);
71 int
72 strncasecmp(const char *s1, const char *s2, size_t n)
74 return (strncasecmp_l(s1, s2, n, uselocale(NULL)));