fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.

/*
 * Handling of TMFFS2 responses from ETM
 */

#include <sys/types.h>
#include <stdio.h>

extern u_char rvi_msg[];
extern int rvi_msg_len;

void
handle_ffs2_response()
{
	if (rvi_msg[3])
		print_etm_pkt_raw("FFS2 error");
	else if (rvi_msg_len == 5)
		async_msg_output("FFS2 command successful");
	else
		print_etm_pkt_raw("FFS2 response");
}