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/*
* fileutil.c
*
* Alexander Occhipinti
* Student ID: 29994705
* Created: 3 Sep 2020
* Last Modified: 4 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
#define DEFAULT_READ_PATH "logfile.txt"
#define NEW_FILE_PERMS 0664
/*
* 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.
*/
int open_file(char *path, int flags){
// Read the input file
int fd;
if ((fd = open(path, flags, NEW_FILE_PERMS)) <= 2){
to_stderr(path);
to_stderr(" could not be opened.\n");
exit(1); // Exit if an error occurs
}
return fd;
}
void file_into_file(int source_fd, int dest_fd){
int bytes_read;
char buffer[FILE_BUF_SIZE];
while ((bytes_read = read(source_fd, buffer, FILE_BUF_SIZE))) {
write(dest_fd, buffer, bytes_read);
}
}
void print_file(char *read_path) {
int read_fd;
read_fd = open_file(read_path, O_RDONLY);
file_into_file(read_fd, 1);
close(read_fd);
}
void copy_file(char *read_path, char *write_path, int overwrite) {
int read_fd, write_fd;
int write_flags = O_WRONLY | O_CREAT;
if (overwrite) write_flags |= O_EXCL;
read_fd = open_file(read_path, O_RDONLY);
write_fd = open_file(write_path, write_flags);
file_into_file(read_fd, write_fd);
close(read_fd);
close(write_fd);
}
char* get_filename(char *full_path){
char* filename = strrchr(full_path, '/'); // Find the string after the last occurence of a '/'
if (!filename) return full_path; // If there are no slashes, the whole path is already a filename
return ++filename; // Return the filename without a leading slash
}
void copy_into_dir(char *file_path, char *dir_path){
char* filename;
char* new_path;
size_t new_path_len;
// filename = strrchr(dir_path, '/');
filename = get_filename(file_path);
// printf("%s\n", filename);
new_path_len = strlen(dir_path) + strlen(filename) + 1;
new_path = (char *) malloc(new_path_len);
strcpy(new_path, dir_path);
strcat(new_path, "/");
strcat(new_path, filename);
copy_file(file_path, new_path, 0);
free(new_path);
}
int main(int argc, char *argv[]) {
switch (argc){
case 0:
exit(1);
case 1:
print_file(DEFAULT_READ_PATH);
break;
case 2:
print_file(argv[1]);
break;
case 3:
to_stderr("Invalid number of arguments sepcified\n");
exit(1);
break;
default:
if (strcmp(argv[2], "-d") == 0){
copy_into_dir(argv[1], argv[3]);
} else {
to_stderr("Invalid argument(s) sepcified\n");
exit(1);
}
}
return 0;
}
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