fgetNUL
while (fgetNUL(buf, sizeof buf, mesgread) != 0) {
fgetNUL(buf, sizeof buf, mesgread);
int fgetNUL(char *, int, FILE *);
if (fgetNUL(buf, sizeof buf, mesgread) == 0)
static int fgetNUL(char *, int, FILE *);