unistr/*, uniconv/*: Fix undefined behaviour. Reported by Jeffrey Walton <noloader@gmail.com>. * lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size. * lib/unistr/u-cpy-alloc.h (FUNC): Likewise. * lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise. * lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.

#ifndef USERSPEC_H
# define USERSPEC_H 1

# include <sys/types.h>

const char *
parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid,
                 char **username_arg, char **groupname_arg);

#endif