1 /* Copyright (c) 2002 Red Hat Incorporated.
2 All rights reserved.
3 Modified (m) 2017 Thomas Wolff to refer to generated Unicode data tables.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
7
8 Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10
11 Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in the
13 documentation and/or other materials provided with the distribution.
14
15 The name of Red Hat Incorporated may not be used to endorse
16 or promote products derived from this software without specific
17 prior written permission.
18
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 ARE DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
23 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /*
32 FUNCTION
33 <<towlower>>, <<towlower_l>>---translate wide characters to lowercase
34
35 INDEX
36 towlower
37
38 INDEX
39 towlower_l
40
41 SYNOPSIS
42 #include <wctype.h>
43 wint_t towlower(wint_t <[c]>);
44
45 #include <wctype.h>
46 wint_t towlower_l(wint_t <[c]>, locale_t <[locale]>);
47
48
49 DESCRIPTION
50 <<towlower>> is a function which converts uppercase wide characters to
51 lowercase, leaving all other characters unchanged.
52
53 <<towlower_l>> is like <<towlower>> but performs the function based on the
54 locale specified by the locale object locale. If <[locale]> is
55 LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
56
57 RETURNS
58 <<towlower>>, <<towlower_l>> return the lowercase equivalent of <[c]> when it is a
59 uppercase wide character; otherwise, it returns the input character.
60
61 PORTABILITY
62 <<towlower>> is C99.
63 <<towlower_l>> is POSIX-1.2008.
64
65 No supporting OS subroutines are required.
66 */
67
68 #include <_ansi.h>
69 #include <ctype.h>
70 #include <wctype.h>
71 #include "local.h"
72
73 wint_t
towlower(wint_t c)74 towlower (wint_t c)
75 {
76 #ifdef _MB_CAPABLE
77 return towctrans (c, WCT_TOLOWER);
78 #else
79 return c < 0x00ff ? (wint_t)(tolower ((int)c)) : c;
80 #endif /* _MB_CAPABLE */
81 }
82
