@subheading stringprep_ucs4_to_utf8
@anchor{stringprep_ucs4_to_utf8}
@deftypefun {char *} {stringprep_ucs4_to_utf8} (const uint32_t * @var{str}, ssize_t @var{len}, size_t * @var{items_read}, size_t * @var{items_written})
@var{str}: a UCS-4 encoded string

@var{len}: the maximum length of  @code{str} to use. If  @code{len} < 0, then
the string is terminated with a 0 character.

@var{items_read}: location to store number of characters read read, or @code{NULL} .

@var{items_written}: location to store number of bytes written or @code{NULL} .
The value here stored does not include the trailing 0
byte.

Convert a string from a 32-bit fixed width representation as UCS-4.
to UTF-8. The result will be terminated with a 0 byte.

Return value: a pointer to a newly allocated UTF-8 string.
This value must be deallocated by the caller.
If an error occurs, @code{NULL}  will be returned.
@end deftypefun

