#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

static void do_cat(const char *path);

static void die(const char *s);

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);

}

#define BUFFER_SIZE 2048

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);

}

static void

die(const char *s)

{

perror(s);

exit(1);

}