#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <errno.h>

int main(int argc, char *argv[]) {

    char *lex_path;
    DIR  *path;
    struct dirent *dent;

    extern int errno;

    if(argc == 1)
        lex_path = "./";

    else if(argc == 2)
        lex_path = argv[1];

    else {

        printf("inappropriate number of args.\n");
        return 1;
    }

    if(!(path = opendir(path))) {

        if(errno == EACCES)
            printf("improper permissions to read dir.\n");

        else if(errno == ENOENT)
            printf("given directory does not exist.\n");

        else if(errno == ENFILE)
            printf("we're out of fd's.\n");

        else if(errno == ENOTDIR)
            printf("argument is not a directory.\n");

        else
            printf("an unspecified error occurred.\n");

        return errno;
    }

    if((dent = readdir(path)) != NULL) {

        if(
    }

    return 0;
}