Function get_41_lenc_string

phx_percona/percona/sql/sql_acl.cc:10557–10591

*/

static
char *get_41_lenc_string(char **buffer,
                         size_t *max_bytes_available,
                         size_t *string_length)
{
 if (*max_bytes_available == 0)
    return NULL;

  /* Do double cast to prevent overflow from signed / unsigned conversion */
  size_t str_len= (size_t)(unsigned char)**buffer;

  /*
    If the length encoded string has the length 0
    the total size of the string is only one byte long (the size byte)
  */
  if (str_len == 0)
  {
    ++*buffer;
    *string_length= 0;
    /*
      Return a pointer to the 0 character so the return value will be
      an empty string.
    */
    return *buffer-1;
  }

  if (str_len >= *max_bytes_available)
    return NULL;

  char *str= *buffer+1;
  *string_length= str_len;
  *max_bytes_available-= *string_length + 1;
  *buffer+= *string_length + 1;
  return str;
}
#endif // EMBEDDED LIBRARY