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