libcucul character set conversions(3caca)

NAME
libcucul character set conversions -

  Functions
unsigned long int cucul_utf8_to_utf32 (char const *, unsigned int *)
Convert a UTF-8 character to UTF-32.
unsigned int cucul_utf32_to_utf8 (char *, unsigned long int)
Convert a UTF-32 character to UTF-8.
unsigned char cucul_utf32_to_cp437 (unsigned long int)
Convert a UTF-32 character to CP437.
unsigned long int cucul_cp437_to_utf32 (unsigned char)
Convert a CP437 character to UTF-32.
int cucul_utf32_is_fullwidth (unsigned long int)
Tell whether a UTF-32 character is fullwidth.

Detailed Description

These functions perform conversions between usual character sets.

Function Documentation

  unsigned long int cucul_utf8_to_utf32 (char const * s, unsigned int * read)

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.
    read A pointer to an unsigned integer to store the number of bytes in the character, or NULL.

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

  unsigned int cucul_utf32_to_utf8 (char * buf, unsigned long int 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.

  unsigned char cucul_utf32_to_cp437 (unsigned long int 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.

  unsigned long int cucul_cp437_to_utf32 (unsigned char 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.

  int cucul_utf32_is_fullwidth (unsigned long int 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.