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2 - 1 
#include <u.h>
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#include <libc.h>
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#include "fmtdef.h"
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static int
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fmtStrFlush(Fmt *f)
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{
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	char *s;
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	int n;
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	if(f->start == nil)
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		return 0;
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	n = (uintptr)f->farg;
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	n *= 2;
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	s = (char*)f->start;
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	f->start = realloc(s, n);
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	if(f->start == nil){
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		f->farg = nil;
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		f->to = nil;
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		f->stop = nil;
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		free(s);
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		return 0;
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	}
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	f->farg = (void*)(uintptr)n;
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	f->to = (char*)f->start + ((char*)f->to - s);
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	f->stop = (char*)f->start + n - 1;
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	return 1;
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}
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int
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fmtstrinit(Fmt *f)
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{
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	int n;
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	memset(f, 0, sizeof *f);
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	f->runes = 0;
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	n = 32;
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	f->start = malloc(n);
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	if(f->start == nil)
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		return -1;
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	f->to = f->start;
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	f->stop = (char*)f->start + n - 1;
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	f->flush = fmtStrFlush;
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	f->farg = (void*)(uintptr)n;
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	f->nfmt = 0;
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	return 0;
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}
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/*
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 * print into an allocated string buffer
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 */
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char*
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vsmprint(char *fmt, va_list args)
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{
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	Fmt f;
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	int n;
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	if(fmtstrinit(&f) < 0)
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		return nil;
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	VA_COPY(f.args,args);
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	n = dofmt(&f, fmt);
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	VA_END(f.args);
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	if(n < 0){
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		free(f.start);
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		return nil;
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	}
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	return fmtstrflush(&f);
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}