| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * charset conversion utils |
| * |
| * Copyright (c) 2017 Rob Clark |
| */ |
| |
| #ifndef __CHARSET_H_ |
| #define __CHARSET_H_ |
| |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| |
| #define MAX_UTF8_PER_UTF16 3 |
| |
| /** |
| * console_read_unicode() - read Unicode code point from console |
| * |
| * @code: pointer to store Unicode code point |
| * Return: 0 = success |
| */ |
| int console_read_unicode(s32 *code); |
| |
| /** |
| * utf8_get() - get next UTF-8 code point from buffer |
| * |
| * @src: pointer to current byte, updated to point to next byte |
| * Return: code point, or 0 for end of string, or -1 if no legal |
| * code point is found. In case of an error src points to |
| * the incorrect byte. |
| */ |
| s32 utf8_get(const char **src); |
| |
| /** |
| * utf8_put() - write UTF-8 code point to buffer |
| * |
| * @code: code point |
| * @dst: pointer to destination buffer, updated to next position |
| * Return: -1 if the input parameters are invalid |
| */ |
| int utf8_put(s32 code, char **dst); |
| |
| /** |
| * utf8_utf16_strnlen() - length of a truncated utf-8 string after conversion |
| * to utf-16 |
| * |
| * @src: utf-8 string |
| * @count: maximum number of code points to convert |
| * Return: length in u16 after conversion to utf-16 without the |
| * trailing \0. If an invalid UTF-8 sequence is hit one |
| * u16 will be reserved for a replacement character. |
| */ |
| size_t utf8_utf16_strnlen(const char *src, size_t count); |
| |
| /** |
| * utf8_utf16_strlen() - length of a utf-8 string after conversion to utf-16 |
| * |
| * @src: utf-8 string |
| * Return: length in u16 after conversion to utf-16 without the |
| * trailing \0. If an invalid UTF-8 sequence is hit one |
| * u16 will be reserved for a replacement character. |
| */ |
| #define utf8_utf16_strlen(a) utf8_utf16_strnlen((a), SIZE_MAX) |
| |
| /** |
| * utf8_utf16_strncpy() - copy utf-8 string to utf-16 string |
| * |
| * @dst: destination buffer |
| * @src: source buffer |
| * @count: maximum number of code points to copy |
| * Return: -1 if the input parameters are invalid |
| */ |
| int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count); |
| |
| /** |
| * utf8_utf16_strcpy() - copy utf-8 string to utf-16 string |
| * |
| * @dst: destination buffer |
| * @src: source buffer |
| * Return: -1 if the input parameters are invalid |
| */ |
| #define utf8_utf16_strcpy(d, s) utf8_utf16_strncpy((d), (s), SIZE_MAX) |
| |
| /** |
| * utf16_get() - get next UTF-16 code point from buffer |
| * |
| * @src: pointer to current word, updated to point to next word |
| * Return: code point, or 0 for end of string, or -1 if no legal |
| * code point is found. In case of an error src points to |
| * the incorrect word. |
| */ |
| s32 utf16_get(const u16 **src); |
| |
| /** |
| * utf16_put() - write UTF-16 code point to buffer |
| * |
| * @code: code point |
| * @dst: pointer to destination buffer, updated to next position |
| * Return: -1 if the input parameters are invalid |
| */ |
| int utf16_put(s32 code, u16 **dst); |
| |
| /** |
| * utf16_strnlen() - length of a truncated utf-16 string |
| * |
| * @src: utf-16 string |
| * @count: maximum number of code points to convert |
| * Return: length in code points. If an invalid UTF-16 sequence is |
| * hit one position will be reserved for a replacement |
| * character. |
| */ |
| size_t utf16_strnlen(const u16 *src, size_t count); |
| |
| /** |
| * utf16_utf8_strnlen() - length of a truncated utf-16 string after conversion |
| * to utf-8 |
| * |
| * @src: utf-16 string |
| * @count: maximum number of code points to convert |
| * Return: length in bytes after conversion to utf-8 without the |
| * trailing \0. If an invalid UTF-16 sequence is hit one |
| * byte will be reserved for a replacement character. |
| */ |
| size_t utf16_utf8_strnlen(const u16 *src, size_t count); |
| |
| /** |
| * utf16_utf8_strlen() - length of a utf-16 string after conversion to utf-8 |
| * |
| * @src: utf-16 string |
| * Return: length in bytes after conversion to utf-8 without the |
| * trailing \0. If an invalid UTF-16 sequence is hit one |
| * byte will be reserved for a replacement character. |
| */ |
| #define utf16_utf8_strlen(a) utf16_utf8_strnlen((a), SIZE_MAX) |
| |
| /** |
| * utf16_utf8_strncpy() - copy utf-16 string to utf-8 string |
| * |
| * @dst: destination buffer |
| * @src: source buffer |
| * @count: maximum number of code points to copy |
| * Return: -1 if the input parameters are invalid |
| */ |
| int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count); |
| |
| /** |
| * utf16_utf8_strcpy() - copy utf-16 string to utf-8 string |
| * |
| * @dst: destination buffer |
| * @src: source buffer |
| * Return: -1 if the input parameters are invalid |
| */ |
| #define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX) |
| |
| /** |
| * utf_to_lower() - convert a Unicode letter to lower case |
| * |
| * @code: letter to convert |
| * Return: lower case letter or unchanged letter |
| */ |
| s32 utf_to_lower(const s32 code); |
| |
| /** |
| * utf_to_upper() - convert a Unicode letter to upper case |
| * |
| * @code: letter to convert |
| * Return: upper case letter or unchanged letter |
| */ |
| s32 utf_to_upper(const s32 code); |
| |
| /* |
| * u16_strncmp() - compare two u16 string |
| * |
| * @s1: first string to compare |
| * @s2: second string to compare |
| * @n: maximum number of u16 to compare |
| * Return: 0 if the first n u16 are the same in s1 and s2 |
| * < 0 if the first different u16 in s1 is less than the |
| * corresponding u16 in s2 |
| * > 0 if the first different u16 in s1 is greater than the |
| * corresponding u16 in s2 |
| */ |
| int u16_strncmp(const u16 *s1, const u16 *s2, size_t n); |
| #define u16_strcmp(s1, s2) u16_strncmp((s1), (s2), SIZE_MAX) |
| |
| /** |
| * u16_strlen - count non-zero words |
| * |
| * This function matches wsclen() if the -fshort-wchar compiler flag is set. |
| * In the EFI context we explicitly need a function handling u16 strings. |
| * |
| * @in: null terminated u16 string |
| * ReturnValue: number of non-zero words. |
| * This is not the number of utf-16 letters! |
| */ |
| size_t u16_strlen(const void *in); |
| |
| /** |
| * u16_strlen - count non-zero words |
| * |
| * This function matches wscnlen_s() if the -fshort-wchar compiler flag is set. |
| * In the EFI context we explicitly need a function handling u16 strings. |
| * |
| * @in: null terminated u16 string |
| * @count: maximum number of words to count |
| * ReturnValue: number of non-zero words. |
| * This is not the number of utf-16 letters! |
| */ |
| size_t u16_strnlen(const u16 *in, size_t count); |
| |
| /** |
| * u16_strcpy() - copy u16 string |
| * |
| * Copy u16 string pointed to by src, including terminating null word, to |
| * the buffer pointed to by dest. |
| * |
| * @dest: destination buffer |
| * @src: source buffer (null terminated) |
| * Return: 'dest' address |
| */ |
| u16 *u16_strcpy(u16 *dest, const u16 *src); |
| |
| /** |
| * u16_strdup() - duplicate u16 string |
| * |
| * Copy u16 string pointed to by src, including terminating null word, to a |
| * newly allocated buffer. |
| * |
| * @src: source buffer (null terminated) |
| * Return: allocated new buffer on success, NULL on failure |
| */ |
| u16 *u16_strdup(const void *src); |
| |
| /** |
| * utf16_to_utf8() - Convert an utf16 string to utf8 |
| * |
| * Converts 'size' characters of the utf16 string 'src' to utf8 |
| * written to the 'dest' buffer. |
| * |
| * NOTE that a single utf16 character can generate up to 3 utf8 |
| * characters. See MAX_UTF8_PER_UTF16. |
| * |
| * @dest the destination buffer to write the utf8 characters |
| * @src the source utf16 string |
| * @size the number of utf16 characters to convert |
| * @return the pointer to the first unwritten byte in 'dest' |
| */ |
| uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size); |
| |
| #endif /* __CHARSET_H_ */ |
