io.h

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#pragma once
#include <stdbool.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef SYS_IOSTREAM_CAPACITY
#define SYS_IOSTREAM_CAPACITY 8
#endif

#define SYS_IOSTREAM_EOF (-1)

// TYPES

typedef struct sys_iostream_t sys_iostream_t;

typedef enum sys_iostream_event_t {
  sys_iostream_event_none = 0,
  sys_iostream_event_read = 1u,
  sys_iostream_event_write = 2u,
} sys_iostream_event_t;

typedef void (*sys_iostream_callback_t)(sys_iostream_t *stream,
                                        sys_iostream_event_t events,
                                        void *userdata);

// LIFECYCLE

extern void sys_iostream_close(sys_iostream_t *s);

// METHODS

extern int sys_iostream_peek(sys_iostream_t *s);

extern size_t sys_iostream_read(sys_iostream_t *s, char *buf, size_t n);

extern bool sys_iostream_eof(sys_iostream_t *s);

extern size_t sys_iostream_write(sys_iostream_t *s, const char *buf, size_t n);

extern ptrdiff_t sys_iostream_seek(sys_iostream_t *s, ptrdiff_t offset,
                                   bool abs);

extern bool sys_iostream_set_callback(sys_iostream_t *stream,
                                      sys_iostream_callback_t callback,
                                      void *userdata);


#ifdef __cplusplus
}
#endif