#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>

void error(char *msg)
{
    write(2, msg, strlen(msg));
}

int main(void)
{
    int fd_in = STDIN_FILENO;
    int fd_out = STDOUT_FILENO;
    struct stat statbuf_in;
    struct stat statbuf_out;

    char c;

    if (fstat(fd_in, &statbuf_in) == -1)
    {
        perror("fstat");
        return (1);
    }
    error("STDIN File type: ");

    switch (statbuf_in.st_mode & S_IFMT)
    {
    case S_IFBLK:
        error("block device\n");
        break;
    case S_IFCHR:
        error("character device\n");
        break;
    case S_IFDIR:
        error("directory\n");
        break;
    case S_IFIFO:
        error("FIFO/pipe\n");
        break;
    case S_IFLNK:
        error("symlink\n");
        break;
    case S_IFREG:
        error("regular file\n");
        break;
    case S_IFSOCK:
        error("socket\n");
        break;
    default:
        error("unknown?\n");
        break;
    }

    error("\n");

    if (fstat(fd_out, &statbuf_out) == -1)
    {
        perror("fstat");
        return (1);
    }

    error("STDOUT File type: ");

    switch (statbuf_out.st_mode & S_IFMT)
    {
    case S_IFBLK:
        error("block device\n");
        break;
    case S_IFCHR:
        error("character device\n");
        break;
    case S_IFDIR:
        error("directory\n");
        break;
    case S_IFIFO:
        error("FIFO/pipe\n");
        break;
    case S_IFLNK:
        error("symlink\n");
        break;
    case S_IFREG:
        error("regular file\n");
        break;
    case S_IFSOCK:
        error("socket\n");
        break;
    default:
        error("unknown?\n");
        break;
    }

    while (read(fd_in, &c, 1) > 0)
    {
        write(fd_out, &c, 1);
    }
    return (0);
}