SO #5

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

int deleteDirectoryContent(char* path) {
  struct dirent *entry;
  DIR* dir = opendir(path);
  int count=0;
  if(dir) {
    while(entry = readdir(dir)) {
      if(strcmp(entry->d_name, ".") && strcmp(entry->d_name, "..")) {
    struct stat st;
    char* entryPath = (char *) malloc((sizeof(entry->d_name)+sizeof(path))*sizeof(char));
    strcpy(entryPath, path);
    strcat(entryPath, "/");
    strcat(entryPath, entry->d_name);
    lstat(entryPath, &st);
    if(S_ISLNK(st.st_mode)) {
      int bufsize = st.st_size + 1;
      char* buf = malloc(bufsize);
      struct stat lst;
      readlink(entryPath, buf, bufsize);
      lstat(buf, &lst);
      if((lst.st_mode & S_IROTH) == 0) {
        count++;
      }
    } else if(S_ISDIR(st.st_mode)) {
      count += deleteDirectoryContent(entryPath);
    } else if(S_ISREG(st.st_mode)) {
      if((st.st_mode & S_IROTH) == 0) {
        remove(entryPath);
        printf("Deleted entry %s in %s\n", entry->d_name, path);
      }

    }
      }

    }
  }
  closedir(dir);
  return count;

}

int main(int argc, char *args[]) {
  if(argc != 2) {
    fprintf(stderr, "Usage: %s <directory>\n", args[0]);
    exit(1);
  }
  struct stat st;
  stat(args[1], &st);
  if(!S_ISDIR(st.st_mode)) {
    fprintf(stderr, "%s is not a directory\n", args[1]);
    exit(1);
  }
  int symbolicLinksCount = deleteDirectoryContent(args[1]);
  printf("Number of files pointed to by symbolic links, without READ permission while deleteing: %d\n", symbolicLinksCount);
  printf("Finished\n");
}