RM_L2_update

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <stdlib.h>

int extensionsMatch(char *fileName, char *extension)
{
    size_t fileNameLen = strlen(fileName),
        extensionLen = strlen(extension);

    if (fileNameLen > extensionLen && fileName[fileNameLen - extensionLen - 1] == '.')
    {
        for (size_t i = 1; i <= extensionLen; i++)
            if (extension[extensionLen - i] != fileName[fileNameLen - i])
                return 0;
        return 1;
    }
    return 0;
}

int main(int argc, char **argv)
{
    DIR *currDir = NULL;
    struct dirent *currFile = NULL;
    ino_t currDescIndex = 0, parentDescIndex = 0;
    size_t filesNum = 0;

    if (argc != 2)
    {
        printf("Error: should be only one argument [file extension]\n");
        exit(EXIT_FAILURE);
    }

    printf("Search for files with extension '%s'...\n", argv[1]);

    do
    {
        if (!(currDir = opendir("./")))
        {
            printf("Error opening directory\n");
            exit(EXIT_FAILURE);
        }

        while (currFile = readdir(currDir))
        {
            if (currFile->d_name[0] == '.')
            {
                if (currFile->d_name[1] == '.')
                    parentDescIndex = currFile->d_ino;
                else if (currFile->d_name[1] == '\0')
                    currDescIndex = currFile->d_ino;
            }

            if (extensionsMatch(currFile->d_name, argv[1]))
            {
                printf("%s\n", currFile->d_name);
                filesNum++;
            }
        }

        chdir("..");
        closedir(currDir);

    } while (currDescIndex != parentDescIndex);

    if (!filesNum)
        printf("There's no files with this extension\n");

    return 0;
}