#include <dirent.h>
#include <errno.h>
#include "__dirent.h"
#include "syscall.h"
#include "libc.h"

int __getdents(int, struct dirent*, size_t);

struct dirent* readdir(DIR* dir) {
  struct dirent* de;

  if (dir->buf_pos >= dir->buf_end) {
    int len = __syscall(SYS_getdents, dir->fd, dir->buf, sizeof dir->buf);
    if (len <= 0) {
      if (len < 0 && len != -ENOENT)
        errno = -len;
      return 0;
    }
    dir->buf_end = len;
    dir->buf_pos = 0;
  }
  de = (void*)(dir->buf + dir->buf_pos);
  dir->buf_pos += de->d_reclen;
  dir->tell = de->d_off;
  return de;
}