Function regerror

compat/regex/regcomp.c:553–585

#endif

/* Returns a message corresponding to an error code, ERRCODE, returned
   from either regcomp or regexec.   We don't use PREG here.  */

size_t
regerror(int errcode, const regex_t *__restrict preg,
	 char *__restrict errbuf, size_t errbuf_size)
{
  const char *msg;
  size_t msg_size;

  if (BE (errcode < 0
	  || errcode >= (int) (sizeof (__re_error_msgid_idx)
			       / sizeof (__re_error_msgid_idx[0])), 0))
    /* Only error codes returned by the rest of the code should be passed
       to this routine.  If we are given anything else, or if other regex
       code generates an invalid error code, then the program has a bug.
       Dump core so we can fix it.  */
    abort ();

  msg = gettext (__re_error_msgid + __re_error_msgid_idx[errcode]);

  msg_size = strlen (msg) + 1; /* Includes the null.  */

  if (BE (errbuf_size != 0, 1))
    {
      if (BE (msg_size > errbuf_size, 0))
	{
	  memcpy (errbuf, msg, errbuf_size - 1);
	  errbuf[errbuf_size - 1] = 0;
	}
      else
	memcpy (errbuf, msg, msg_size);
    }

  return msg_size;
}