如何获取目录中的目录数？

Question

I am trying to get the number of directories in a folder except the files in but I cannot get the correct result. Somebody help me to solve this problem? Especially what should I sent to the isDirectory() function?

int listFilesIndir(char *currDir) 
{
    struct dirent *direntp;


    DIR *dirp;
    int x ,y =0 ;


    if ((dirp = opendir(currDir)) == NULL) 
    {
        perror ("Failed to open directory");
        return 1;
    }

    while ((direntp = readdir(dirp)) != NULL)
    {
        printf("%s\n", direntp->d_name);
        x= isDirectory(dirp);
        if(x != 0)
            y++;
    }
    printf("direc Num : %d\n",y );

    while ((closedir(dirp) == -1) && (errno == EINTR)) ;

    return 0;
}


int isDirectory(char *path) 
{
    struct stat statbuf;

    if (stat(path, &statbuf) == -1)
        return 0;
    else 
        return S_ISDIR(statbuf.st_mode);
}

Answer 1

You're sending a directory stream to the function, and treating it like a path.

Linux and some other Unix systems include a way to get this info directly:

while ((direntp = readdir(dirp)) != NULL)
{
    printf("%s\n", direntp->d_name);
    if (direntp->d_type == DT_DIR)
       y++;
}

Otherwise, make sure you send the right details to the function, ie

x= isDirectory(direntp->d_name);

Answer 2

The call for your function is wrong.

x= isDirectory(dirp);

While the prototype of function is:

int isDirectory(char *path) 

It need a string as parameter, but you give it a "DIR *dirp;". I changed the code as:

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

int listFilesIndir(char *currDir)
{
    struct dirent *direntp;


    DIR *dirp;
    int x ,y =0 ;


    if ((dirp = opendir(currDir)) == NULL)
    {
        perror ("Failed to open directory");
        return 1;
    }

    while ((direntp = readdir(dirp)) != NULL)
    {
        printf("%s\n", direntp->d_name);
        if(direntp->d_type == DT_DIR)
            y++;
    }
    printf("direc Num : %d\n",y );

    while ((closedir(dirp) == -1) && (errno == EINTR)) ;

    return 0;
}

int main(int argc, char **argv){
    if(argc == 2){
        // Check whether the argv[1] is a directory firstly.
        listFilesIndir(argv[1]);
    }
    else{
        printf("Usage: %s directory", argv[0]);        
    }
    return 0;
}

I tested it on my Linux server. And it works well. SO @teppic is right. But pay attention, in the code, the number of directory includes two specific ".." (parent directory) and "." (current directory). If you do not want to include it, you could change:

printf("direc Num : %d\n",y );

into:

printf("direc Num : %d\n",y-2 );

Hope it helps!