Prevent an off-by-one in a allocated buffer in glob_match_url() - detected by

   * be longer than the URL we use. We allocate a good start size, then

   * we need to realloc in case of need.

   */

  allocsize=strlen(filename);

  allocsize=strlen(filename)+1; /* make it at least one byte to store the

                                   trailing zero */

  target = malloc(allocsize);

  if(NULL == target)

    return NULL; /* major failure */

    }

    if(appendlen + stringlen >= allocsize) {

      char *newstr;

      allocsize = (appendlen + stringlen)*2;

      /* we append a single byte to allow for the trailing byte to be appended

         at the end of this function outside the while() loop */

      allocsize = (appendlen + stringlen)*2 + 1;

      newstr=realloc(target, allocsize);

      if(NULL ==newstr) {

        free(target);