Solution for Exercise 23-4

ex2304

#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <time.h>
#include <sys/stat.h>

int main()
{
    DIR *folder;
    struct dirent *file;
    struct stat filestat;

    folder=opendir(".");
    if(folder==NULL)
    {
        puts("Unable to read directory");
        exit(1);
    }
    while(file = readdir(folder))
    {
        stat(file->d_name,&filestat);
        if(S_ISDIR(filestat.st_mode))
            printf("%-14s %-5s %s",
                file->d_name,
                "<DIR>",
                ctime(&filestat.st_mtime));
        else
            printf("%-14s %5ld %s",
                file->d_name,
                (long)filestat.st_size,
                ctime(&filestat.st_mtime));
    }
    closedir(folder);
    return(0);
}

Notes

* Multiple solutions are possible for this code, so don't accept my solution as the best one!

* I put the the S_ISDIR macro to work at Line 22. The if condition returns TRUE if a directory is found, so I stuffed the printf() function that follows at Line 23 with the text <DIR> inside as an immediate value. Otherwise, the else part of the decision is executed, which looks similar to the code from Exercise 23-3.

Exercise ex2305 →