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lib: charset: utility functions for Unicode

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utf8_get() - get next UTF-8 code point from buffer
utf8_put() - write UTF-8 code point to buffer
utf8_utf16_strnlen() - length of a utf-8 string after conversion to utf-16
utf8_utf16_strncpy() - copy a utf-8 string to utf-16
utf16_get() - get next UTF-16 code point from buffer
utf16_put() - write UTF-16 code point to buffer
utf16_strnlen() - number of codes points in a utf-16 string
utf16_utf8_strnlen() - length of a utf-16 string after conversion to utf-8
utf16_utf8_strncpy() - copy a utf-16 string to utf-8

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt
2018-08-31 21:31:27 +02:00
committed by Alexander Graf
parent 1dde0d57a5
commit d8c28232c3
2 changed files with 363 additions and 3 deletions
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130
include/charset.h
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@@ -8,10 +8,140 @@
#ifndef __CHARSET_H_
#define __CHARSET_H_
#include <linux/kernel.h>
#include <linux/types.h>
#define MAX_UTF8_PER_UTF16 3
/**
* 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 bytes after conversion to utf-16 without the
* trailing \0. If an invalid UTF-8 sequence is hit one
* word 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 bytes after conversion to utf-16 without the
* trailing \0. -1 if the utf-8 string is not valid.
*/
#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. -1 if the utf-16 string is not valid.
*/
#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)
/**
* u16_strlen - count non-zero words
*