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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* Convert UTF-16 string to UTF-8 string.
Copyright (C) 2002, 2006-2007, 2009-2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
#define FUNC u16_to_u8
#define SRC_UNIT uint16_t
#define DST_UNIT uint8_t
#include <errno.h>
#include <stdlib.h>
#include <string.h>
DST_UNIT *
FUNC (const SRC_UNIT *s, size_t n, DST_UNIT *resultbuf, size_t *lengthp)
{
const SRC_UNIT *s_end = s + n;
/* Output string accumulator. */
DST_UNIT *result;
size_t allocated;
size_t length;
if (resultbuf != NULL)
{
result = resultbuf;
allocated = *lengthp;
}
else
{
result = NULL;
allocated = 0;
}
length = 0;
/* Invariants:
result is either == resultbuf or == NULL or malloc-allocated.
If length > 0, then result != NULL. */
while (s < s_end)
{
ucs4_t uc;
int count;
/* Fetch a Unicode character from the input string. */
count = u16_mbtoucr (&uc, s, s_end - s);
if (count < 0)
{
if (!(result == resultbuf || result == NULL))
free (result);
errno = EILSEQ;
return NULL;
}
s += count;
/* Store it in the output string. */
count = u8_uctomb (result + length, uc, allocated - length);
if (count == -1)
{
if (!(result == resultbuf || result == NULL))
free (result);
errno = EILSEQ;
return NULL;
}
if (count == -2)
{
DST_UNIT *memory;
allocated = (allocated > 0 ? 2 * allocated : 12);
if (length + 6 > allocated)
allocated = length + 6;
if (result == resultbuf || result == NULL)
memory = (DST_UNIT *) malloc (allocated * sizeof (DST_UNIT));
else
memory =
(DST_UNIT *) realloc (result, allocated * sizeof (DST_UNIT));
if (memory == NULL)
{
if (!(result == resultbuf || result == NULL))
free (result);
errno = ENOMEM;
return NULL;
}
if (result == resultbuf && length > 0)
memcpy ((char *) memory, (char *) result,
length * sizeof (DST_UNIT));
result = memory;
count = u8_uctomb (result + length, uc, allocated - length);
if (count < 0)
abort ();
}
length += count;
}
if (length == 0)
{
if (result == NULL)
{
/* Return a non-NULL value. NULL means error. */
result = (DST_UNIT *) malloc (1);
if (result == NULL)
{
errno = ENOMEM;
return NULL;
}
}
}
else if (result != resultbuf && length < allocated)
{
/* Shrink the allocated memory if possible. */
DST_UNIT *memory;
memory = (DST_UNIT *) realloc (result, length * sizeof (DST_UNIT));
if (memory != NULL)
result = memory;
}
*lengthp = length;
return result;
}
|
