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

#define BUFFER_SIZE 2048

static void die(const char *s){
  perror(s);
  exit(1);
}

static void do_cat(const char *path){
  int fd;
  unsigned char buf[BUFFER_SIZE];
  int n;

  fd = open(path, O_RDONLY);
  if(fd < 0) die(path);
  for(;;){
    n = read(fd, buf, sizeof buf);
    if (n < 0) die(path);
    if(n == 0) break;
    if(write(STDOUT_FILENO, buf, n) < 0) die(path);
  }
  if(close(fd) < 0) die(path);
}

int main(int argc, char *argv[]){
  int i;
  if(argc < 2){
    fprintf(stderr, "%s: file name not given\n", argv[0]);
    exit(1);
  }
  for(i=1; i<argc; i++){
    do_cat(argv[i]);
  }
  exit(0);
}