NAME

       caca_charset - libcaca character set conversions

   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_flush_figlet(), caca_put_str(), and caca_utf32_is_fullwidth().

   __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.

       Referenced by caca_get_export_list(), and caca_utf32_is_fullwidth().

   __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.

       Referenced by caca_utf32_is_fullwidth().

   __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.

       Referenced by caca_get_import_list(), and caca_utf32_is_fullwidth().

   __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.

       Referenced by caca_utf32_is_fullwidth().

   __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.

       References caca_cp437_to_utf32(), caca_utf32_to_ascii(), caca_utf32_to_cp437(),
       caca_utf32_to_utf8(), and caca_utf8_to_utf32().

       Referenced by caca_get_export_list(), caca_put_char(), and caca_put_str().

Author

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