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.

#include <sys/types.h>
#include <strings.h>
#include "types.h"
#include "simregs.h"

extern u16 conf1_reg;

void
cmd_reset(argbulk)
	char *argbulk;
{
	char *argv[2];

	if (parse_args(argbulk, 1, 1, argv, 0) < 0)
		return;
	if (!strcmp(argv[0], "0"))
		SIMREGS.conf1 = conf1_reg &= ~SIM_CONF1_SRSTLEV;
	else if (!strcmp(argv[0], "1"))
		SIMREGS.conf1 = conf1_reg |= SIM_CONF1_SRSTLEV;
	else
		printf("ERROR: \"0\" or \"1\" argument expected\n");
}