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extern int vstream_fflush(VSTREAM *);
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extern int vstream_fputs(const char *, VSTREAM *);
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extern VSTREAM *vstream_fdopen(int, int);
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#define vstream_fread(v, b, n) vbuf_read(&(v)->buf, (b), (n))
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#define vstream_fwrite(v, b, n) vbuf_write(&(v)->buf, (b), (n))