#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <string.h>
#include <stddef.h>

caddr_t mmapptr, ptr_tmp;
struct stat statbuf;
time_t now, total=0;

void fatal(char *msg)
{
	fprintf(stderr, "%s\n", msg);
	exit(EXIT_FAILURE);
}

void termination_handler(int signum)
{
        munmap(mmapptr, statbuf.st_size);
        fatal("exiting gracefully.");
}

void xread(void)
{
	char *line, *token, *running;
	const char delims[]="(:)";
	int retval, hours, mins, secs;

	for(;ptr_tmp-mmapptr<statbuf.st_size;)
	{
		if ((retval=sscanf(ptr_tmp, "%a[^\n]", 
			&line)==EOF)) break;
		running=line;
/*		token=strsep(&running, delims);
		token=strsep(&running, delims);
		if (token!=NULL) hours=atoi(token); else hours=0;
		token=strsep(&running, delims);
		if (token!=NULL) mins=atoi(token); else hours=mins=0;
		token=strsep(&running, delims);
		if (token!=NULL) secs=atoi(token); else hours=mins=secs=0;*/
		for(ptr_tmp+=strlen(line);*ptr_tmp=='\n';ptr_tmp++);
	}
}

void readfile(int fd)
{
	fstat(fd, &statbuf);
	if ((ptr_tmp=mmapptr=mmap(0, statbuf.st_size,
		PROT_READ, MAP_SHARED, fd, 0))==-1)
		fatal("error mapping file into memory.");
	xread();
	munmap(mmapptr, statbuf.st_size);
}

int main(int argc, char **argv)
{
	int i, fd;

	if (signal(SIGINT, termination_handler)==SIG_IGN)
		signal(SIGINT, SIG_IGN);
	if (signal(SIGHUP, termination_handler)==SIG_IGN)
		signal(SIGHUP, SIG_IGN);
	if (signal(SIGTERM, termination_handler)==SIG_IGN)
		signal(SIGTERM, SIG_IGN);
	if (signal(SIGKILL, termination_handler)==SIG_IGN)
		signal(SIGKILL, SIG_IGN);
	if (signal(SIGQUIT, termination_handler)==SIG_IGN)
		signal(SIGQUIT, SIG_IGN);

	now=time(NULL);

	if (argc<2) fatal("no log-files specified");
	for(i=1; i<argc; ++i)
	{
		if ((fd=open(argv[i], O_RDONLY, S_IRUSR))==-1)
			fatal("error opening input file.");
		readfile(fd);
		close(fd);
	}
	
//	printf("Total is %ld mins\n", total/60);
	return (EXIT_SUCCESS);
}