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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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int
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_stringnwidth(Font *f, char *s, Rune *r, int len)
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{
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	int wid, twid, n, max, l;
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	char *name;
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	enum { Max = 64 };
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	ushort cbuf[Max];
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	Rune rune, **rptr;
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	char *subfontname, **sptr;
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	Font *def;
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	if(s == nil){
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		s = "";
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		sptr = nil;
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	}else
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		sptr = &s;
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	if(r == nil){
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		r = L"";
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		rptr = nil;
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	}else
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		rptr = &r;
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	twid = 0;
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	while(len>0 && (*s || *r)){
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		max = Max;
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		if(len < max)
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			max = len;
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		n = 0;
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		while((l = cachechars(f, sptr, rptr, cbuf, max, &wid, &subfontname)) <= 0){
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			if(++n > 10){
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				if(*r)
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					rune = *r;
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				else
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					chartorune(&rune, s);
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				if(f->name != nil)
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					name = f->name;
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				else
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					name = "unnamed font";
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				fprint(2, "stringwidth: bad character set for rune 0x%.4ux in %s\n", rune, name);
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				return twid;
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			}
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			if(subfontname){
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				if(_getsubfont(f->display, subfontname) == 0){
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					def = f->display->defaultfont;
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					if(def && f!=def)
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						f = def;
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					else
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						break;
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				}
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			}
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		}
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		agefont(f);
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		twid += wid;
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		len -= l;
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	}
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	return twid;
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}
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int
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stringnwidth(Font *f, char *s, int len)
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{
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	return _stringnwidth(f, s, nil, len);
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}
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int
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stringwidth(Font *f, char *s)
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{
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	return _stringnwidth(f, s, nil, 1<<24);
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}
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Point
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stringsize(Font *f, char *s)
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{
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	return Pt(_stringnwidth(f, s, nil, 1<<24), f->height);
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}
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int
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runestringnwidth(Font *f, Rune *r, int len)
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{
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	return _stringnwidth(f, nil, r, len);
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}
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int
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runestringwidth(Font *f, Rune *r)
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{
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	return _stringnwidth(f, nil, r, 1<<24);
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}
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Point
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runestringsize(Font *f, Rune *r)
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{
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	return Pt(_stringnwidth(f, nil, r, 1<<24), f->height);
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}