b5130a8125
Provide functions for upper and lower case conversion. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>
203 lines
5.8 KiB
C
203 lines
5.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* charset conversion utils
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*
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* Copyright (c) 2017 Rob Clark
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*/
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#ifndef __CHARSET_H_
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#define __CHARSET_H_
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#include <linux/kernel.h>
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#include <linux/types.h>
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#define MAX_UTF8_PER_UTF16 3
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/**
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* utf8_get() - get next UTF-8 code point from buffer
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*
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* @src: pointer to current byte, updated to point to next byte
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* Return: code point, or 0 for end of string, or -1 if no legal
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* code point is found. In case of an error src points to
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* the incorrect byte.
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*/
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s32 utf8_get(const char **src);
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/**
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* utf8_put() - write UTF-8 code point to buffer
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*
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* @code: code point
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* @dst: pointer to destination buffer, updated to next position
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* Return: -1 if the input parameters are invalid
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*/
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int utf8_put(s32 code, char **dst);
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/**
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* utf8_utf16_strnlen() - length of a truncated utf-8 string after conversion
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* to utf-16
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*
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* @src: utf-8 string
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* @count: maximum number of code points to convert
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* Return: length in bytes after conversion to utf-16 without the
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* trailing \0. If an invalid UTF-8 sequence is hit one
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* word will be reserved for a replacement character.
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*/
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size_t utf8_utf16_strnlen(const char *src, size_t count);
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/**
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* utf8_utf16_strlen() - length of a utf-8 string after conversion to utf-16
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*
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* @src: utf-8 string
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* Return: length in bytes after conversion to utf-16 without the
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* trailing \0. -1 if the utf-8 string is not valid.
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*/
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#define utf8_utf16_strlen(a) utf8_utf16_strnlen((a), SIZE_MAX)
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/**
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* utf8_utf16_strncpy() - copy utf-8 string to utf-16 string
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*
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* @dst: destination buffer
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* @src: source buffer
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* @count: maximum number of code points to copy
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* Return: -1 if the input parameters are invalid
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*/
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int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count);
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/**
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* utf8_utf16_strcpy() - copy utf-8 string to utf-16 string
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*
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* @dst: destination buffer
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* @src: source buffer
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* Return: -1 if the input parameters are invalid
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*/
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#define utf8_utf16_strcpy(d, s) utf8_utf16_strncpy((d), (s), SIZE_MAX)
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/**
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* utf16_get() - get next UTF-16 code point from buffer
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*
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* @src: pointer to current word, updated to point to next word
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* Return: code point, or 0 for end of string, or -1 if no legal
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* code point is found. In case of an error src points to
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* the incorrect word.
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*/
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s32 utf16_get(const u16 **src);
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/**
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* utf16_put() - write UTF-16 code point to buffer
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*
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* @code: code point
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* @dst: pointer to destination buffer, updated to next position
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* Return: -1 if the input parameters are invalid
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*/
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int utf16_put(s32 code, u16 **dst);
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/**
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* utf16_strnlen() - length of a truncated utf-16 string
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*
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* @src: utf-16 string
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* @count: maximum number of code points to convert
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* Return: length in code points. If an invalid UTF-16 sequence is
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* hit one position will be reserved for a replacement
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* character.
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*/
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size_t utf16_strnlen(const u16 *src, size_t count);
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/**
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* utf16_utf8_strnlen() - length of a truncated utf-16 string after conversion
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* to utf-8
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*
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* @src: utf-16 string
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* @count: maximum number of code points to convert
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* Return: length in bytes after conversion to utf-8 without the
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* trailing \0. If an invalid UTF-16 sequence is hit one
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* byte will be reserved for a replacement character.
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*/
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size_t utf16_utf8_strnlen(const u16 *src, size_t count);
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/**
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* utf16_utf8_strlen() - length of a utf-16 string after conversion to utf-8
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*
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* @src: utf-16 string
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* Return: length in bytes after conversion to utf-8 without the
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* trailing \0. -1 if the utf-16 string is not valid.
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*/
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#define utf16_utf8_strlen(a) utf16_utf8_strnlen((a), SIZE_MAX)
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/**
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* utf16_utf8_strncpy() - copy utf-16 string to utf-8 string
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*
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* @dst: destination buffer
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* @src: source buffer
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* @count: maximum number of code points to copy
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* Return: -1 if the input parameters are invalid
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*/
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int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count);
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/**
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* utf16_utf8_strcpy() - copy utf-16 string to utf-8 string
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*
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* @dst: destination buffer
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* @src: source buffer
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* Return: -1 if the input parameters are invalid
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*/
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#define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX)
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/**
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* utf_to_lower() - convert a Unicode letter to lower case
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*
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* @code: letter to convert
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* Return: lower case letter or unchanged letter
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*/
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s32 utf_to_lower(const s32 code);
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/**
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* utf_to_upper() - convert a Unicode letter to upper case
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*
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* @code: letter to convert
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* Return: upper case letter or unchanged letter
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*/
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s32 utf_to_upper(const s32 code);
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/**
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* u16_strlen - count non-zero words
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*
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* This function matches wsclen() if the -fshort-wchar compiler flag is set.
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* In the EFI context we explicitly need a function handling u16 strings.
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*
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* @in: null terminated u16 string
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* ReturnValue: number of non-zero words.
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* This is not the number of utf-16 letters!
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*/
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size_t u16_strlen(const u16 *in);
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/**
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* u16_strlen - count non-zero words
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*
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* This function matches wscnlen_s() if the -fshort-wchar compiler flag is set.
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* In the EFI context we explicitly need a function handling u16 strings.
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*
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* @in: null terminated u16 string
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* @count: maximum number of words to count
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* ReturnValue: number of non-zero words.
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* This is not the number of utf-16 letters!
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*/
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size_t u16_strnlen(const u16 *in, size_t count);
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/**
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* utf16_to_utf8() - Convert an utf16 string to utf8
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*
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* Converts 'size' characters of the utf16 string 'src' to utf8
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* written to the 'dest' buffer.
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*
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* NOTE that a single utf16 character can generate up to 3 utf8
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* characters. See MAX_UTF8_PER_UTF16.
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*
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* @dest the destination buffer to write the utf8 characters
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* @src the source utf16 string
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* @size the number of utf16 characters to convert
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* @return the pointer to the first unwritten byte in 'dest'
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*/
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uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);
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#endif /* __CHARSET_H_ */
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