1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/**
* mds — A micro-display server
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "string.h"
#include <libmdsserver/macros.h>
#include <stdlib.h>
/**
* Get the length of a string.
*
* @param string The string.
* @return The length of the string.
*/
size_t string_length(const char32_t* restrict string)
{
size_t i = 0;
while (string[i] >= 0)
i++;
return i;
}
/**
* Convert a NUL-terminated UTF-8 string to a -1-terminated UTF-32 string.
*
* @param string The UTF-8 string.
* @return The string in UTF-32, `NULL` on error.
*/
char32_t* string_decode(const char* restrict string)
{
size_t i, j, n, length = 0;
char32_t* rc;
/* Get the length of the UTF-32 string, excluding termination. */
for (i = 0; string[i]; i++)
if ((string[i] & 0xC0) != 0x80)
length++;
/* Allocated UTF-32 string. */
if (xmalloc(rc, length + 1, char32_t))
return NULL;
/* Convert to UTF-32. */
for (i = j = n = 0; string[i]; i++)
{
char c = string[i];
if (n)
{
rc[j] <<= 6, rc[j] |= c & 0x3F;
if (--n == 0)
j++;
}
else if ((c & 0xC0) == 0xC0)
{
while (c & 0x80)
n++, c = (char)(c << 1);
rc[j] = c >> n--;
}
else
rc[j++] = c & 255;
}
/* -1-terminate and return. */
return rc[length] = -1, rc;
}
|
