Scan Directory

How to scan a directory and list all files. You can use this code to write an application that will run some process on all the files under a directory tree.

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

static int isdir(char *path)
{
   struct stat statbuf;
   if (stat(path, &statbuf) == -1)
      return 0;
   return S_ISDIR(statbuf.st_mode);
}

static int recur(char *path, int indent)
{
   DIR *dp;
   struct dirent *dirp;

   if (chdir(path) == -1)
   {
      perror(path);
      return -1;
   }
   if ((dp = opendir(".")) == NULL)
      return -1;

   while ((dirp = readdir(dp)) != NULL)
   {
      if (isdir(dirp->d_name))
      {
          printf("%*s%s/\n", indent, "", dirp->d_name);
          if (dirp->d_name[0] != '.')
          recur(dirp->d_name, indent + 3);
      }
      else
          printf("%*s%s\n", indent, "", dirp->d_name);
   }
   chdir("..");
   closedir(dp);
   return 0;
}

int main(int argc, char *argv[])
{
   if (argc != 2)
   {
      printf("Usage: dir <dirname>\n");
      exit(1);
   }
   recur(argv[1], 0);
   return 0;
}