Convert a return code integer to a text string. This string can be
used to output a diagnostic message to the user.
STRINGPREP_OK
Successful operation. This value is guaranteed to
always be zero, the remaining ones are only guaranteed to hold
non-zero values, for logical comparison purposes.
STRINGPREP_CONTAINS_UNASSIGNED
String contain unassigned Unicode
code points, which is forbidden by the profile.
STRINGPREP_CONTAINS_PROHIBITED
String contain code points
prohibited by the profile.
STRINGPREP_BIDI_BOTH_L_AND_RAL
String contain code points with
conflicting bidirection category.
STRINGPREP_BIDI_LEADTRAIL_NOT_RAL
Leading and trailing character
in string not of proper bidirectional category.
STRINGPREP_BIDI_CONTAINS_PROHIBITED
Contains prohibited code
points detected by bidirectional code.
STRINGPREP_TOO_SMALL_BUFFER
Buffer handed to function was too
small. This usually indicate a problem in the calling
application.
STRINGPREP_PROFILE_ERROR
The stringprep profile was inconsistent.
This usually indicate an internal error in the library.
STRINGPREP_FLAG_ERROR
The supplied flag conflicted with profile.
This usually indicate a problem in the calling application.
STRINGPREP_UNKNOWN_PROFILE
The supplied profile name was not
known to the library.
STRINGPREP_NFKC_FAILED
The Unicode NFKC operation failed. This
usually indicate an internal error in the library.
STRINGPREP_MALLOC_ERROR
The malloc() was out of memory. This is
usually a fatal error.
RETURN VALUE
Returns a pointer to a statically allocated string
containing a description of the error with the return code rc.
