[Normal] ls -R(재귀함수사용)

#include <stdlib.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>

main(int argc, char *argv[])
{
        void        read_directory(DIR *, char *);
        void        fatal(char *);
        DIR        *dir;
        char        file[1024];
        struct        dirent *directory;

        if(argc == 1) strcpy(file, ".");
        else        strcpy(file, argv[1]);

        if((dir = opendir(file)) == NULL)
                fatal("opendir");

        read_directory(dir, file);

}

void
read_directory(DIR *dir, char *file)
{
        void        fatal(char *);
        DIR        *imsi_dir;
        struct        dirent  *directory;
        struct        stat    file_stat;
        char        buff[1024];

        while(directory = readdir(dir))
                {
                if(!strncmp(directory->d_name, ".", 1) ||
                        !strcmp(directory->d_name, ".."))
                        continue;

                if(directory->d_ino == 0)
                        continue;

                sprintf(buff, "%s/%s", file, directory->d_name);
                puts(buff);

                if(lstat(buff, &file_stat) < 0)
                        fatal("stat");

                if(S_ISDIR(file_stat.st_mode))//디렉토리인지 검사
                        {
                        printf("directory ");
                        imsi_dir = opendir(buff);
                        read_directory(imsi_dir, buff);
                        }
                }

        closedir(dir);
}

void
fatal(char *error_name)
{
        perror(error_name);
        exit(1);
}