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#include <io.h>
#include <stdio.h>
int setvbuf(FILE *restrict stream, char *restrict buf, int type, size_t size)
{
if (type != _IOFBF && type != _IOLBF && type != _IONBF)
return -1;
if (type != _IONBF && (buf == NULL || size == 0))
return -1;
if (stream->fd < 0)
return -1;
stream->buf = buf;
stream->buf_size = size;
stream->buf_pos = 0;
stream->type = type;
return 0;
}
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