S01_PLIKI_07

/*
Napisz odpowiednik programu „cp” do kopiowania plików, bez obsługi katalogów i opcji wykonania.
*/

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

#define BUFFER_SIZE 128

int main(int argc, char *argv[])
{
    if(argc != 3) {
        fprintf(stderr, "Niepoprawna liczba argumentow!\nUzycie programu: %s [plik, ktory ma zostac skopiowany] [nowa nazwa/sciezka pliku]\n", argv[0]);
        return EXIT_FAILURE;
    }

    char *first_filename = argv[1];
    char *second_filename = argv[2];
    int first_fd, second_fd;
    ssize_t status;
    char buffer[BUFFER_SIZE];
    ssize_t bytes_count = 0;

    if((first_fd = open(first_filename, O_RDONLY, 0600)) == -1) {
        perror("open_first");
        return EXIT_FAILURE;
    }

    if((second_fd = open(second_filename, O_WRONLY | O_CREAT, 0600)) == -1) {
        perror("open_second");
        return EXIT_FAILURE;
    }

    for(;;) {
        status = read(first_fd, buffer, BUFFER_SIZE-1);
        if(status == -1) {
            perror("read");
            return EXIT_FAILURE;
        }
        else if(status == 0) {
            break;
        }
        else {
            bytes_count += status;
            if(write(second_fd, buffer, BUFFER_SIZE-1) == -1) {
                perror("write");
                return EXIT_FAILURE;
            }
        }
    }

    printf("Skopiowano pomyslnie %ld bajtow!\n", bytes_count);

    if(close(second_fd) == -1) {
        perror("close_second");
        return EXIT_FAILURE;
    }

    if(close(first_fd) == -1) {
        perror("close_first");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}