/*
 * This module holds our main loop code, factored out into a separate
 * function that is called from main() after initialization.
 */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

extern int target_fd;
extern FILE *main_outf;

struct timeval curtime;

main_loop()
{
	fd_set fds;
	struct timeval tv;
	u_char buf[512];
	int cc, i, is_active;

	for (is_active = 0; ; ) {
		FD_ZERO(&fds);
		FD_SET(target_fd, &fds);
		if (is_active) {
			tv.tv_sec = 1;
			tv.tv_usec = 0;
			cc = select(target_fd+1, &fds, 0, 0, &tv);
		} else
			cc = select(target_fd+1, &fds, 0, 0, 0);
		gettimeofday(&curtime, 0);
		if (cc < 0) {
			if (errno == EINTR)
				continue;
			perror("select");
			exit(1);
		}
		if (cc == 0) {
			is_active = 0;
			fflush(main_outf);
			flush_pending_byte();
			continue;
		}
		cc = read(target_fd, buf, sizeof buf);
		if (cc < 0) {
			perror("serial port read");
			exit(1);
		}
		if (cc == 0) {
			fprintf(stderr, "read EOF from serial port\n");
			exit(1);
		}
		current_date_time();
		for (i = 0; i < cc; i++)
			rx_byte_in(buf[i]);
		is_active = 1;
	}
}