1 /* Store a character in UTF-8 string.
2 Copyright (C) 2002, 2005-2006, 2009-2020 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
4
5 This program is free software: you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19
20 #if defined IN_LIBUNISTRING
21 /* Tell unistr.h to declare u8_uctomb as 'extern', not 'static inline'. */
22 # include "unistring-notinline.h"
23 #endif
24
25 /* Specification. */
26 #include "unistr.h"
27
28 #if !HAVE_INLINE
29
30 int
u8_uctomb(uint8_t * s,ucs4_t uc,int n)31 u8_uctomb (uint8_t *s, ucs4_t uc, int n)
32 {
33 if (uc < 0x80)
34 {
35 if (n > 0)
36 {
37 s[0] = uc;
38 return 1;
39 }
40 /* else return -2, below. */
41 }
42 else
43 {
44 int count;
45
46 if (uc < 0x800)
47 count = 2;
48 else if (uc < 0x10000)
49 {
50 if (uc < 0xd800 || uc >= 0xe000)
51 count = 3;
52 else
53 return -1;
54 }
55 else if (uc < 0x110000)
56 count = 4;
57 else
58 return -1;
59
60 if (n >= count)
61 {
62 switch (count) /* note: code falls through cases! */
63 {
64 case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
65 case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
66 case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
67 /*case 1:*/ s[0] = uc;
68 }
69 return count;
70 }
71 }
72 return -2;
73 }
74
75 #endif
76