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#include <u.h>
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#include <libc.h>
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#include "fmtdef.h"
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/*
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 * generic routine for flushing a formatting buffer
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 * to a file descriptor
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 */
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int
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_fmtFdFlush(Fmt *f)
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{
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	int n;
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	n = (char*)f->to - (char*)f->start;
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	if(n && write((int)(uintptr)f->farg, f->start, n) != n)
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		return 0;
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	f->to = f->start;
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	return 1;
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}
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int
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vfprint(int fd, char *fmt, va_list args)
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{
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	Fmt f;
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	char buf[256];
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	int n;
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	fmtfdinit(&f, fd, buf, sizeof(buf));
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	f.args = args;
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	n = dofmt(&f, fmt);
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	if(n > 0 && _fmtFdFlush(&f) == 0)
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		return -1;
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	return n;
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}