1 /* Store a character in UTF-8 string.
2    Copyright (C) 2002, 2005-2006, 2009-2018 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
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