text: #include "stdio.h"
  #include "stdlib.h"
  
  int fgetc(int fd)
  {
      unsigned char c;
  
      while (read(fd, &c, 1) != 1)
          ;
  
      return c;
  }
  
  void fputc(char c, int fd)
  {
      write(fd, &c, 1);
  }
  
  void fputs(const char *s, int fd)
  {
      write(fd, (char *)s, strlen(s));
  }
  