#include <u.h>#include <libc.h>#include "fmtdef.h" /* format the output into f->to and return the number of characters fmted  */ intdorfmt(Fmt *f, const Rune *fmt){	Rune *rt, *rs;	int r;	char *t, *s;	int nfmt; 	nfmt = f->nfmt;	for(;;){		if(f->runes){			rt = f->to;			rs = f->stop;			while((r = *fmt++) && r != '%'){				FMTRCHAR(f, rt, rs, r);			}			f->nfmt += rt - (Rune *)f->to;			f->to = rt;			if(!r)				return f->nfmt - nfmt;			f->stop = rs;		}else{			t = f->to;			s = f->stop;			while((r = *fmt++) && r != '%'){				FMTRUNE(f, t, f->stop, r);			}			f->nfmt += t - (char *)f->to;			f->to = t;			if(!r)				return f->nfmt - nfmt;			f->stop = s;		} 		fmt = __fmtdispatch(f, (Rune*)fmt, 1);		if(fmt == nil)			return -1;	}	return 0;		/* not reached */}