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>

u_char *
memset(buf, c, n)
	u_char *buf;
	int c;
	unsigned n;
{
	u_char *p = buf;

	for (; n; n--)
		*p++ = c;
	return buf;
}