#pragma once

#include <stdarg.h>

#ifdef __cplusplus
/** An object type used for streams */
struct kIoDevice {
  /** Function that prints a character to the stream */
  virtual void putc(char) = 0;
  /** Function that prints a string to the stream */
  virtual int puts(const char *, int) = 0;
  /** Flush write buffers */
  virtual void flush() = 0;
};
typedef kIoDevice FILE;
#else
typedef void FILE;
#endif

/** A FILE value corresponding to stdin, the keyboard buffer */
extern FILE *stdin;
/** A FILE value corresponding to stdout, the display */
extern FILE *stdout;
/** A FILE value corresponding to stderr, the uart */
extern FILE *stderr;

#ifdef __cplusplus
extern "C" {
#endif
/**
 * Write the formatted string to stdout
 *
 * Supports ``%s`` (string), ``%d`` (decimal), ``%u`` (unsigned), ``%x`` (hexadecimal)
 */
int printf(const char *restrict format, ...);

/**
 * Write the formatted string to stream; see printf
 */
int fprintf(FILE *restrict stream, const char *restrict format, ...);

/**
 * Write the formatted string to stream; see printf
 */
int vfprintf(FILE *restrict stream, const char *restrict format, va_list ap);
#ifdef __cplusplus
}
#endif