copy_file_dir.cpp

/*============================================================
    @author - Rushitkumar Jasani   @rollno - 2018201034
=============================================================*/
#ifndef MYHEADER_H
#define MYHEADER_H
#include "myheader.h"
#endif

#ifndef GLOBAL_H
#define GLOBAL_H
#include "global.h"
#endif
/*============================================================
simple copy sunction which takes two paths.
managed to keep owners and permission intact.
=============================================================*/
void file_copy(string from, string to)
{
    FILE *from_f, *to_f;
    char c;
    if ((from_f = fopen(from.c_str(), "r")) == NULL) {
        perror("");
        return;
    }
    if ((to_f = fopen(to.c_str(), "w")) == NULL) {
        perror("");
        return;
    }
    while (!feof(from_f)) {
        c = getc(from_f);
        putc(c, to_f);
    }
    struct stat from_stat;
    stat(from.c_str(), &from_stat);
    chown(to.c_str(), from_stat.st_uid, from_stat.st_gid);
    chmod(to.c_str(), from_stat.st_mode);
    fclose(from_f);
    fclose(to_f);
    return;
}
/*============================================================
this function takes directory as path and create replica
of the folder in Destination folder.
=============================================================*/
void directory_copy(string from, string to)
{
    DIR* dp;
    dp = opendir(from.c_str());
    struct dirent* d;
    if (dp == NULL) {
        perror("opendir");
        return;
    }
    while ((d = readdir(dp))) {
        if (strcmp(d->d_name, ".") == 0 || strcmp(d->d_name, "..") == 0)
            continue;
        else {
            string from_path = from + "/" + string(d->d_name);
            string to_path = to + "/" + string(d->d_name);
            if (isDirectory(from_path)) {
                if (mkdir(to_path.c_str(), 0755) == -1) {
                    perror("");
                    return;
                }
                else
                    directory_copy(from_path, to_path);
            }
            else {
                file_copy(from_path.c_str(), to_path.c_str());
            }
        }
    }
    closedir(dp);
    return;
}
/*============================================================
this command performs copy on multiple arguments one by one
by calling respective directory_copy or file_copy function.
eg : copy <f1> <f2> <d1> <f3> <Destination Folder>
=============================================================*/
int my_copy()
{
    if (my_command.size() < 3)
        printf("too few arguments\n");
    else {
        string dest_folder = create_absolute_path(my_command[my_command.size() - 1]);
        if (!isDirectory(dest_folder)) {
            cout << "Destination is not a folder." << endl;
            return 1;
        }
        for (unsigned int i = 1; i < my_command.size() - 1; i++) {
            string from_path = create_absolute_path(my_command[i]);
            size_t found = from_path.find_last_of("/\\");
            string to_path = dest_folder + "/" + from_path.substr(found + 1, from_path.length() - found);
            if (isDirectory(from_path)) {
                if (mkdir(to_path.c_str(), 0755) != 0) {
                    perror("");
                    return 1;
                }
                directory_copy(from_path, to_path);
            }
            else {
                file_copy(from_path, to_path);
            }
        }
    }
    return 0;
}