#include "file.h"

#include <errno.h>
#include <stdio.h>

extern int setvbuf(
	struct __opaque_file *restrict stream,
	char *restrict buf,
	int mode,
	size_t size)
{
	switch (mode) {
	case _IOFBF:
	case _IOLBF:
	case _IONBF:
		break;
	default:
		return __set_errno(EINVAL);
	}

	if (stream->f_prev != 0) {
		return __set_errno(EINVAL);
	}

	int err = SUCCESS;
	if (buf) {
		err = __libc_ringbuf_resize_static(&stream->f_buf, buf, size);
	} else {
		err = __libc_ringbuf_resize(&stream->f_buf, size);
	}

	if (err != SUCCESS) {
		return __set_errno(err);
	}

	stream->f_buffer_mode = mode;

	return 0;
}