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typedef struct _io_bstream io_bstream_t;
typedef int (io_open_f)(io_bstream_t*, va_list);
extern io_open_f IO_MEM;
extern io_stream_t *io_open(io_open_f*, io_mode_t, ...);
#include <stdio.h>
int vprintf(const char *format, va_list ap);
int vfprintf(FILE *stream, const char *format, va_list ap);
int vsprintf(char *str, const char *format, va_list ap);
int vsnprintf(char *str, size_t size, const char *format, va_list ap);