CP

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

#define MAXLEN 1024

int nread;
char str2[MAXLEN];
char *stroki[MAXLEN];
char data[MAXLEN];
struct stat file_stat;
int fd1, fd2;

void close_all(){
    close(fd1);
    close(fd2);
}

int main(int argc, char ** argv){


    if(argc > 3 || argc < 3){
        perror("Illegal number of args");
        return 0;
    }

    char * arg1 = argv[1];
    char * arg2 = argv[2];

    if(strcmp(arg1, arg2) == 0){
        printf("%s\n", "Cannot copy file over itself");
        return 0;
    }

    fd1 = open(arg1, O_RDONLY);

    if(fd1 == -1){
        perror("Error in opening first file");
        close_all();
        return 0;
    }

    fd2 = open(arg2, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);

    if(fd2 == -1){
        perror("Error in opening second file");
        close_all();
        return 0;
    }

    int res;

    while(res = read(fd1, &data, MAXLEN)){
        if(res == -1){
            perror("Error while reading from file");
            close_all();
            return 0;
        }
        printf("%d\n", res);
        int resW = write(fd2, &data, res);
        if(resW == -1){
            perror("Error while writing to file");
            close_all();
            return 0;
        }
    }

    printf("%s\n", "Copy finished");
    close_all();

    return 0;
}