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


int main(int argc, char *argv[])
{
  if(argc < 2)
    {
      fprintf(stderr,"Please specify a file.\n");
      exit(1);
    }

  struct stat buf;
  int ret = stat(argv[1],&buf);
  if(ret == -1)
    {
      fprintf(stderr,"Error stating file '%s'\n",argv[1]);
      exit(2);
    }

  if(!S_ISREG(buf.st_mode))
    {
      fprintf(stderr,"'%s' is not a regular file\n",argv[1]);
      exit(3);
    }

  int fd = open(argv[1],O_RDONLY);
  if(fd < 0)
    {
      fprintf(stderr,"Error opening file '%s'\n",argv[1]);
      exit(4);
    }

  char *map = (char *)mmap(NULL,buf.st_size+1,PROT_READ|PROT_WRITE,MAP_PRIVATE,
			fd,0);

  if(map == MAP_FAILED)
    {
      fprintf(stderr,"Error opening file '%s'\n",argv[1]);
      exit(5);
    }

  char *next = map;
  while((next = strtok(next," \t\n")))
    {
      printf("token: <%s>\n",next);
      next = NULL;
    }
}