caca_charset

Section: libcaca (3caca)
Updated: Tue Jan 26 2021
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NAME

caca_charset - libcaca character set conversions

SYNOPSIS

Modules

libcaca primitives drawing

Functions

__extern uint32_t caca_utf8_to_utf32 (char const *, size_t *)
Convert a UTF-8 character to UTF-32.
__extern size_t caca_utf32_to_utf8 (char *, uint32_t)
Convert a UTF-32 character to UTF-8.
__extern uint8_t caca_utf32_to_cp437 (uint32_t)
Convert a UTF-32 character to CP437.
__extern uint32_t caca_cp437_to_utf32 (uint8_t)
Convert a CP437 character to UTF-32.
__extern char caca_utf32_to_ascii (uint32_t)
Convert a UTF-32 character to ASCII.
__extern int caca_utf32_is_fullwidth (uint32_t)
Tell whether a UTF-32 character is fullwidth.

Detailed Description

These functions perform conversions between usual character sets.

Function Documentation

__extern uint32_t caca_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 caca_put_str().

__extern size_t caca_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 caca_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 caca_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 caca_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 caca_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 caca_put_char(), and caca_put_str().

Author

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