]>
git.ipfire.org Git - people/ms/u-boot.git/blob - lib/charset.c
2 * charset conversion utils
4 * Copyright (c) 2017 Rob Clark
6 * SPDX-License-Identifier: GPL-2.0+
14 * utf8/utf16 conversion mostly lifted from grub
17 size_t utf16_strlen(const uint16_t *in
)
20 for (i
= 0; in
[i
]; i
++);
24 size_t utf16_strnlen(const uint16_t *in
, size_t count
)
27 for (i
= 0; count
-- && in
[i
]; i
++);
31 uint16_t *utf16_strcpy(uint16_t *dest
, const uint16_t *src
)
35 while ((*dest
++ = *src
++) != '\0')
41 uint16_t *utf16_strdup(const uint16_t *s
)
44 if (!s
|| !(new = malloc((utf16_strlen(s
) + 1) * 2)))
50 /* Convert UTF-16 to UTF-8. */
51 uint8_t *utf16_to_utf8(uint8_t *dest
, const uint16_t *src
, size_t size
)
53 uint32_t code_high
= 0;
56 uint32_t code
= *src
++;
59 if (code
>= 0xDC00 && code
<= 0xDFFF) {
61 code
= ((code_high
- 0xD800) << 10) + (code
- 0xDC00) + 0x10000;
63 *dest
++ = (code
>> 18) | 0xF0;
64 *dest
++ = ((code
>> 12) & 0x3F) | 0x80;
65 *dest
++ = ((code
>> 6) & 0x3F) | 0x80;
66 *dest
++ = (code
& 0x3F) | 0x80;
70 /* *src may be valid. Don't eat it. */
78 } else if (code
<= 0x07FF) {
79 *dest
++ = (code
>> 6) | 0xC0;
80 *dest
++ = (code
& 0x3F) | 0x80;
81 } else if (code
>= 0xD800 && code
<= 0xDBFF) {
84 } else if (code
>= 0xDC00 && code
<= 0xDFFF) {
87 } else if (code
< 0x10000) {
88 *dest
++ = (code
>> 12) | 0xE0;
89 *dest
++ = ((code
>> 6) & 0x3F) | 0x80;
90 *dest
++ = (code
& 0x3F) | 0x80;
92 *dest
++ = (code
>> 18) | 0xF0;
93 *dest
++ = ((code
>> 12) & 0x3F) | 0x80;
94 *dest
++ = ((code
>> 6) & 0x3F) | 0x80;
95 *dest
++ = (code
& 0x3F) | 0x80;