1 /* Case and normalization insensitive comparison of strings.
2 Copyright (C) 2009-2021 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2009.
4
5 This file is free software.
6 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
7 You can redistribute it and/or modify it under either
8 - the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 3, or (at your
10 option) any later version, or
11 - the terms of the GNU General Public License as published by the
12 Free Software Foundation; either version 2, or (at your option)
13 any later version, or
14 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
15
16 This file is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License and the GNU General Public License
20 for more details.
21
22 You should have received a copy of the GNU Lesser General Public
23 License and of the GNU General Public License along with this
24 program. If not, see <https://www.gnu.org/licenses/>. */
25
26 #include <config.h>
27
28 /* Specification. */
29 #include "unicase.h"
30
31 #include <errno.h>
32 #include <stdlib.h>
33
34 #include "minmax.h"
35 #include "uninorm.h"
36 #include "uniconv.h"
37 #include "unistr.h"
38
39 static uint8_t *
ulc_u8_casefold(const char * s,size_t n,const char * iso639_language,uninorm_t nf,uint8_t * resultbuf,size_t * lengthp)40 ulc_u8_casefold (const char *s, size_t n, const char *iso639_language,
41 uninorm_t nf,
42 uint8_t *resultbuf, size_t *lengthp)
43 {
44 uint8_t convbuf[2048 / sizeof (uint8_t)];
45 uint8_t *conv;
46 size_t conv_length;
47 uint8_t *result;
48
49 /* Convert the string to UTF-8. */
50 conv_length = sizeof (convbuf) / sizeof (uint8_t);
51 conv =
52 u8_conv_from_encoding (locale_charset (), iconveh_error, s, n, NULL,
53 convbuf, &conv_length);
54 if (conv == NULL)
55 /* errno is set here. */
56 return NULL;
57
58 /* Case-fold and normalize. */
59 result = u8_casefold (conv, conv_length, iso639_language, nf,
60 resultbuf, lengthp);
61 if (result == NULL)
62 {
63 if (conv != convbuf)
64 {
65 int saved_errno = errno;
66 free (conv);
67 errno = saved_errno;
68 }
69 return NULL;
70 }
71
72 if (conv != convbuf)
73 free (conv);
74 return result;
75 }
76
77 #define FUNC ulc_casecmp
78 #define UNIT uint8_t
79 #define SRC_UNIT char
80 #define U_CASEFOLD ulc_u8_casefold
81 #define U_CMP2 u8_cmp2
82 #include "u-casecmp.h"
83