libcucul character set conversions

Functions
__extern uint32_t	cucul_utf8_to_utf32 (char const *, size_t *)
	Convert a UTF-8 character to UTF-32.
__extern size_t	cucul_utf32_to_utf8 (char *, uint32_t)
	Convert a UTF-32 character to UTF-8.
__extern uint8_t	cucul_utf32_to_cp437 (uint32_t)
	Convert a UTF-32 character to CP437.
__extern uint32_t	cucul_cp437_to_utf32 (uint8_t)
	Convert a CP437 character to UTF-32.
__extern char	cucul_utf32_to_ascii (uint32_t)
	Convert a UTF-32 character to ASCII.
__extern int	cucul_utf32_is_fullwidth (uint32_t)
	Tell whether a UTF-32 character is fullwidth.

---

Detailed Description

These functions perform conversions between usual character sets.

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Function Documentation

__extern uint32_t cucul_utf8_to_utf32	(	char const *	s,
		size_t *	bytes
	)

Convert a UTF-8 character read from a string and return its value in the UTF-32 character set. If the second argument is not null, the total number of read bytes is written in it.

If a null byte was reached before the expected end of the UTF-8 sequence, this function returns zero and the number of read bytes is set to zero.

This function never fails, but its behaviour with illegal UTF-8 sequences is undefined.

Parameters:

	s	A string containing the UTF-8 character.
	bytes	A pointer to a size_t to store the number of bytes in the character, or NULL.

Returns:

The corresponding UTF-32 character, or zero if the character is incomplete.

Referenced by cucul_put_str().

__extern size_t cucul_utf32_to_utf8	(	char *	buf,
		uint32_t	ch
	)

Convert a UTF-32 character read from a string and write its value in the UTF-8 character set into the given buffer.

This function never fails, but its behaviour with illegal UTF-32 characters is undefined.

Parameters:

	buf	A pointer to a character buffer where the UTF-8 sequence will be written.
	ch	The UTF-32 character.

Returns:

The number of bytes written.

__extern uint8_t cucul_utf32_to_cp437

(

uint32_t

ch

)

Convert a UTF-32 character read from a string and return its value in the CP437 character set, or "?" if the character has no equivalent.

This function never fails.

Parameters:

ch

The UTF-32 character.

Returns:

The corresponding CP437 character, or "?" if not representable.

__extern uint32_t cucul_cp437_to_utf32

(

uint8_t

ch

)

Convert a CP437 character read from a string and return its value in the UTF-32 character set, or zero if the character is a CP437 control character.

This function never fails.

Parameters:

ch

The CP437 character.

Returns:

The corresponding UTF-32 character, or zero if not representable.

__extern char cucul_utf32_to_ascii

(

uint32_t

ch

)

Convert a UTF-32 character into an ASCII character. When no equivalent exists, a graphically close equivalent is sought.

This function never fails, but its behaviour with illegal UTF-32 characters is undefined.

Parameters:

ch

The UTF-32 character.

Returns:

The corresponding ASCII character, or a graphically close equivalent if found, or "?" if not representable.

__extern int cucul_utf32_is_fullwidth

(

uint32_t

ch

)

Check whether the given UTF-32 character should be printed at twice the normal width (fullwidth characters). If the character is unknown or if its status cannot be decided, it is treated as a standard-width character.

This function never fails.

Parameters:

ch

The UTF-32 character.

Returns:

1 if the character is fullwidth, 0 otherwise.

Referenced by cucul_put_char(), and cucul_put_str().