1dde0d57a5
The function names utf16_strlen() and utf16_strnlen() are misnomers. The functions do not count utf-16 characters but non-zero words. So let's rename them to u16_strlen and u16_strnlen(). In utf16_dup() avoid assignment in if clause. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>
80 lines
2.2 KiB
C
80 lines
2.2 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/types.h>
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#define MAX_UTF8_PER_UTF16 3
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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_strcpy() - UTF16 equivalent of strcpy()
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*/
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uint16_t *utf16_strcpy(uint16_t *dest, const uint16_t *src);
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/**
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* utf16_strdup() - UTF16 equivalent of strdup()
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*/
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uint16_t *utf16_strdup(const uint16_t *s);
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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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/**
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* utf8_to_utf16() - Convert an utf8 string to utf16
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*
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* Converts up to 'size' characters of the utf16 string 'src' to utf8
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* written to the 'dest' buffer. Stops at 0x00.
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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 maximum 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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uint16_t *utf8_to_utf16(uint16_t *dest, const uint8_t *src, size_t size);
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#endif /* __CHARSET_H_ */
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