gsasl  1.10.0
About: GNU SASL is an implementation of the Simple Authentication and Security Layer (SASL). Development version.
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u8-uctomb.c
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1 /* Store a character in UTF-8 string.
2  Copyright (C) 2002, 2005-2006, 2009-2021 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 #include "attribute.h"
29 
30 #if !HAVE_INLINE
31 
32 int
33 u8_uctomb (uint8_t *s, ucs4_t uc, ptrdiff_t n)
34 {
35  if (uc < 0x80)
36  {
37  if (n > 0)
38  {
39  s[0] = uc;
40  return 1;
41  }
42  /* else return -2, below. */
43  }
44  else
45  {
46  int count;
47 
48  if (uc < 0x800)
49  count = 2;
50  else if (uc < 0x10000)
51  {
52  if (uc < 0xd800 || uc >= 0xe000)
53  count = 3;
54  else
55  return -1;
56  }
57  else if (uc < 0x110000)
58  count = 4;
59  else
60  return -1;
61 
62  if (n >= count)
63  {
64  switch (count) /* note: code falls through cases! */
65  {
66  case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
68  case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
70  case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
71  /*case 1:*/ s[0] = uc;
72  }
73  return count;
74  }
75  }
76  return -2;
77 }
78 
79 #endif
#define FALLTHROUGH
Definition: attribute.h:142
#define uint8_t
Definition: stdint.in.h:154
int u8_uctomb(unsigned char *s, ucs4_t uc, ptrdiff_t n)
Definition: u8-uctomb.c:33
unsigned int ucs4_t
Definition: unitypes.in.h:24