/*
 * fileutil.c
 * 
 *  Alexander Occhipinti
 * Student ID: 29994705
 * Created: 3 Sep 2020
 * Last Modified: 3 Sep 2020
 * 
 * fileutil is a program which is a utility for files. It combines the functionality of cat cp and mv.
 * This program allows you to copy the contents of a given file to stdout or to a another file.
 * It also allows you to delete the original (i.e. mv) if you please.
 *  
*/

#include <unistd.h>
#include <sys/file.h>
#include <stdlib.h>
#include <string.h>
#include "fileutil.h"
#define FILE_BUF_SIZE 1024

/*
 * Prints a given string to stdout. Returns nothing.
*/
void to_stdout(char *string) {
    write(1, string, strlen(string));
}

/*
 * Prints a given string to stderr. Returns nothing.
*/
void to_stderr(char *string) {
    write(2, string, strlen(string));
}

/*
 * Prints the contents of a given file (provided a path) to stdout.
 * Returns nothing.
*/
void print_file(char *read_path) {
    int infile, bytes_read;

    // Read the input file
    if ((infile = open(read_path, O_RDONLY)) <= 2){
        to_stderr(read_path);
        to_stderr(" could not be opened for reading.\n");
        exit(1); // Exit if an error occurs
    }
    
    // Write contents to stdout using a buffer
    char buffer[FILE_BUF_SIZE];
    while ((bytes_read = read(infile, buffer, FILE_BUF_SIZE))) {
        write(1, buffer, bytes_read);
    }

    close(infile);
}

int main(int argc, char *argv[]) {
    if (argc >= 2) {
        print_file(argv[1]);
    } else {
        print_file("logfile.txt");
    }
    return 0;
}