递归打开目录UNIX / C.

Question

我试图以递归方式打开目录并打印一些有关文件的元数据。但是，目录无法打开。目录名称是正确的，我很难说为什么opendir不工作。

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <string.h>
void scan( const char *dir) // process one directory
{
  DIR *dp;
 struct dirent *de; 
 struct stat sbuf;
 dp = opendir( dir);
if( dp == NULL) 
{ 
   //perror( dir);
   printf("Cannot open directory: %s\n",dir);
    return;
 }
 // printf("%s\n",dir);
while(1)
 {
    //const char * d_name;
    de = readdir( dp);
    if( de == NULL)
             break;//Empty Directory

//d_name = de->d_name;
    //printf("d_name: %s\n",d_name);
    if(strcmp(de->d_name,"..") == 0 || strcmp(de->d_name,".") == 0)
           continue;
 //AT THIS POINT ALL .. AND . SHOULD BE SKIPPED AND CONTINUED.
    char abs_path[1024];
      snprintf(abs_path,1024,"%s/%s",dir,de->d_name);
    if(stat(abs_path, &sbuf))
    {
          //perror(abs_path);
          printf("Error in stat %s\n",abs_path);
          continue;
    }
    if( S_ISDIR(sbuf.st_mode))
    {
           printf( "d\t");
           printf( "%lu\t%s\n", (unsigned long) sbuf.st_size,abs_path);
           scan(abs_path);
    }
    else
    {
          //printf("d_name tab: %s\n",d_name);
          printf("\t");
          printf( "%lu\t%s\n", (unsigned long) sbuf.st_size,abs_path);
    }

 }
 closedir(dp);
}
int main( int argc, char *argv[])
{
  if( argc > 1)
  for( int i = 1; i < argc; ++i) 
    scan( argv[i]);
  else
    scan(".");
  return 0;
}