483     char_u  *new_rtp;  in add_pack_dir_to_rtp()  local
566     new_rtp = alloc(oldlen + addlen + afterlen + 1); // add one for NUL  in add_pack_dir_to_rtp()
567     if (new_rtp == NULL)  in add_pack_dir_to_rtp()
573     mch_memmove(new_rtp, p_rtp, keep);  in add_pack_dir_to_rtp()
576 	new_rtp[new_rtp_len++] = ',';  // add comma before  in add_pack_dir_to_rtp()
577     mch_memmove(new_rtp + new_rtp_len, fname, addlen - 1);  in add_pack_dir_to_rtp()
580 	new_rtp[new_rtp_len++] = ',';  // add comma after  in add_pack_dir_to_rtp()
587 	mch_memmove(new_rtp + new_rtp_len, p_rtp + keep,  in add_pack_dir_to_rtp()
590 	mch_memmove(new_rtp + new_rtp_len, afterdir, afterlen - 1);  in add_pack_dir_to_rtp()
592 	new_rtp[new_rtp_len++] = ',';  in add_pack_dir_to_rtp()
598 	mch_memmove(new_rtp + new_rtp_len, p_rtp + keep, oldlen - keep + 1);  in add_pack_dir_to_rtp()
600 	new_rtp[new_rtp_len] = NUL;  in add_pack_dir_to_rtp()
606 	STRCAT(new_rtp, ",");  in add_pack_dir_to_rtp()
607 	STRCAT(new_rtp, afterdir);  in add_pack_dir_to_rtp()
610     set_option_value((char_u *)"rtp", 0L, new_rtp, 0);  in add_pack_dir_to_rtp()
611     vim_free(new_rtp);  in add_pack_dir_to_rtp()