#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>

int main()
{ printf("uid %d\n", getuid());
  char buffer[1024];
  int fd = open("weaths", O_RDONLY | O_DIRECTORY | O_EXCL);
  printf("fd = %d\n", fd);
  if (fd < 0)
  { perror("open \"weaths\"");
    exit(1); }
  while (1)
  { int n = read(fd, buffer, 1024), i;
    printf("n = %d, errno = %d\n", n, errno);
    if (n <= 0)
    { if (n < 0)
        perror("read");
      break; }
    for (i = 0; i < n; i += 1)
    { char c = buffer[i];
      if (isalnum(c) || c == '.')
        printf(" %c", c);
      else
        printf("[%X]", 0xFF & (unsigned int) c); } }
  printf("\n"); }