/src/gnutls/lib/unistring/unistr/u16-uctomb-aux.c
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1 | | /* Conversion UCS-4 to UTF-16. |
2 | | Copyright (C) 2002, 2006-2007, 2009-2023 Free Software Foundation, Inc. |
3 | | Written by Bruno Haible <bruno@clisp.org>, 2002. |
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 "unistr.h" |
30 | | |
31 | | int |
32 | | u16_uctomb_aux (uint16_t *s, ucs4_t uc, ptrdiff_t n) |
33 | 0 | { |
34 | 0 | if (uc < 0xd800) |
35 | 0 | { |
36 | | /* The case n >= 1 is already handled by the caller. */ |
37 | 0 | } |
38 | 0 | else if (uc < 0x10000) |
39 | 0 | { |
40 | 0 | if (uc >= 0xe000) |
41 | 0 | { |
42 | 0 | if (n >= 1) |
43 | 0 | { |
44 | 0 | s[0] = uc; |
45 | 0 | return 1; |
46 | 0 | } |
47 | 0 | } |
48 | 0 | else |
49 | 0 | return -1; |
50 | 0 | } |
51 | 0 | else |
52 | 0 | { |
53 | 0 | if (uc < 0x110000) |
54 | 0 | { |
55 | 0 | if (n >= 2) |
56 | 0 | { |
57 | 0 | s[0] = 0xd800 + ((uc - 0x10000) >> 10); |
58 | 0 | s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff); |
59 | 0 | return 2; |
60 | 0 | } |
61 | 0 | } |
62 | 0 | else |
63 | 0 | return -1; |
64 | 0 | } |
65 | 0 | return -2; |
66 | 0 | } |