#include <u.h>#include <libc.h>#include <draw.h> int_stringnwidth(Font *f, char *s, Rune *r, int len){	int wid, twid, n, max, try;	enum { Max = 64 };	ushort cbuf[Max];	Rune rune, **rptr;	char *subfontname, **sptr;	Subfont *sf; 	if(s == nil){		s = "";		sptr = nil;	}else		sptr = &s;	if(r == nil){		r = L"";		rptr = nil;	}else		rptr = &r;	subfontname = nil;	sf = nil;	twid = 0;	try = 0;	while((*s || *r) && len > 0){		max = Max;		if(len < max)			max = len;		if(subfontname){			freesubfont(sf);			if((sf=_getsubfont(f->display, subfontname)) == nil){				if(f->display == nil || f->display->defaultfont == nil || f->display->defaultfont == f)					break;				f = f->display->defaultfont;			}		}		if((n = cachechars(f, sptr, rptr, cbuf, max, &wid, &subfontname)) <= 0){			if(n == 0){				if(++try > 10)					break;				continue;			}			if(*r)				r++;			else				s += chartorune(&rune, s);			len--;			continue;		}		try = 0; 		agefont(f);		twid += wid;		len -= n;	}	freesubfont(sf);	return twid;} intstringnwidth(Font *f, char *s, int len){	return _stringnwidth(f, s, nil, len);} intstringwidth(Font *f, char *s){	return _stringnwidth(f, s, nil, 1<<24);} Pointstringsize(Font *f, char *s){	return Pt(_stringnwidth(f, s, nil, 1<<24), f->height);} intrunestringnwidth(Font *f, Rune *r, int len){	return _stringnwidth(f, nil, r, len);} intrunestringwidth(Font *f, Rune *r){	return _stringnwidth(f, nil, r, 1<<24);} Pointrunestringsize(Font *f, Rune *r){	return Pt(_stringnwidth(f, nil, r, 1<<24), f->height);}