#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>

enum
{
    RIGHTS = 0666,
};

void
write_le(int fd, int val)
{
    char tmp[sizeof(val)];
    unsigned mask = (1 << CHAR_BIT) - 1;
    for (int i = 0; i < sizeof(val); ++i) {
        tmp[i] = val & mask;
        val >>= CHAR_BIT;
    }
    write(fd, tmp, sizeof(tmp));
}


void
write_be(int fd, int val)
{
    char tmp[sizeof(val)];
    unsigned mask = (1 << CHAR_BIT) - 1;
    for (int i = sizeof(val) - 1; i >= 0; --i) {
        tmp[i] = val & mask;
        val >>= CHAR_BIT;
    }
    write(fd, tmp, sizeof(tmp));
}

int
main(int argc, char **argv)
{
    int fd = open(argv[1], O_CREAT | O_RDWR | O_TRUNC, RIGHTS);

    switch (argv[2][0]) {
    case 'L':
        for (int i = 1; i < 11; ++i) {
            write_le(fd, i);
        }
        break;
    case 'B':
        for (int i = 1; i < 11; ++i) {
            write_be(fd, i);
        }
        break;
    default:
        for (int i = 1; i < 11; ++i) {
            write(fd, &i, sizeof(i));
        }
    }

    close(fd);


    return 0;
}