2 * charset conversion utils
4 * Copyright (c) 2017 Rob Clark
6 * SPDX-License-Identifier: GPL-2.0+
12 #define MAX_UTF8_PER_UTF16 4
15 * utf16_strlen() - Get the length of an utf16 string
17 * Returns the number of 16 bit characters in an utf16 string, not
18 * including the terminating NULL character.
20 * @in the string to measure
21 * @return the string length
23 size_t utf16_strlen(const uint16_t *in);
26 * utf16_strnlen() - Get the length of a fixed-size utf16 string.
28 * Returns the number of 16 bit characters in an utf16 string,
29 * not including the terminating NULL character, but at most
30 * 'count' number of characters. In doing this, utf16_strnlen()
31 * looks at only the first 'count' characters.
33 * @in the string to measure
34 * @count the maximum number of characters to count
35 * @return the string length, up to a maximum of 'count'
37 size_t utf16_strnlen(const uint16_t *in, size_t count);
40 * utf16_strcpy() - UTF16 equivalent of strcpy()
42 uint16_t *utf16_strcpy(uint16_t *dest, const uint16_t *src);
45 * utf16_strdup() - UTF16 equivalent of strdup()
47 uint16_t *utf16_strdup(const uint16_t *s);
50 * utf16_to_utf8() - Convert an utf16 string to utf8
52 * Converts 'size' characters of the utf16 string 'src' to utf8
53 * written to the 'dest' buffer.
55 * NOTE that a single utf16 character can generate up to 4 utf8
56 * characters. See MAX_UTF8_PER_UTF16.
58 * @dest the destination buffer to write the utf8 characters
59 * @src the source utf16 string
60 * @size the number of utf16 characters to convert
61 * @return the pointer to the first unwritten byte in 'dest'
63 uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);
65 #endif /* __CHARSET_H_ */