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

#define BUFFER_SIZE 1024

int main(){

	char *sourcePath, *destPath;
	ssize_t ret_in, ret_out;
	char temp[BUFFER_SIZE];

	printf("Enter source file path: ");
	scanf("%s", sourcePath);

	printf("Enter destination file path: ");
	scanf("%s", destPath);

	int sourceFile = open(sourcePath, O_RDONLY);
	if(sourceFile == -1){
		printf("Error: invalid source file");
		return 0;
	}

	int destFile = open(destPath, O_WRONLY | O_CREAT);
	if(destFile == -1){
		printf("Error: invalid destination file");
		return 0;
	}

	while((ret_in = read(sourceFile, &temp, BUFFER_SIZE)) > 0){
            ret_out = write(destFile, &temp, (ssize_t) ret_in);
            if(ret_out != ret_in){
                printf("Copy failed");
            }
    }

	close(sourceFile);
	close(destFile);
}