Renamer (v. 1.0)

/*
 * File:   main.cpp
 * Author: KeplerBR
 * Version: 1.0
 *
 * Created on 8 de Julho de 2014, 23:10
 *
 * Tested only on Linux.
 * To use, open via terminal. Will rename all files in the directory to lowcase.
 * For example, a file named "KeplerBR" will be renamed to "keplerbr"
 */

#include <stdio.h>
#include <cstdlib>
#include <dirent.h>
#include <algorithm>
#include <string>
#include <unistd.h>
#define GetCurrentDir getcwd

using namespace std;

int main(int argc, char** argv) {
    // Get current path
    char currentPath[FILENAME_MAX];

    if (!GetCurrentDir(currentPath, sizeof(currentPath))) {
        fprintf(stderr, "Could not recognize the current directory\n");
        return 1;
    }

    currentPath[sizeof (currentPath) - 1] = '\0';
    printf("The current working directory is %s\n", currentPath);

    // List files
    DIR *dir;
    struct dirent *ent;
    if ((dir = opendir(currentPath)) != NULL) {
        int countError = 0;

        while ((ent = readdir(dir)) != NULL) {
            // Rename
            string currentName = ent->d_name;
            if (currentName == "." || currentName == "..") {
                continue;
            }

            string newName;
            newName.resize(currentName.size());
            transform(currentName.begin(), currentName.end(), newName.begin(), ::tolower);

            bool resultRename;
            resultRename = rename(currentName.data(), newName.data());
            if (resultRename == 0) {
                printf("%s -> %s\n", currentName.data(), newName.data());
            } else {
                fprintf(stderr, "Could not rename %s to %s\n", currentName.data(), newName.data());
                countError++;
            }
        }

        if (countError > 0) {
            printf("Failed to rename %i file(s)\n", countError);
        }
    } else {
        fprintf(stderr, "Could not open directory\n");
        return 1;
    }

    return 0;
}