#include <u.h>#include <libc.h>#include <libg.h>#include <frame.h> int_frcanfit(Frame *f, Point pt, Frbox *b){	int left, w, nr;	uchar *p;	Rune r; 	left = f->r.max.x-pt.x;	if(b->nrune < 0)		return b->minwid <= left;	if(left >= b->wid)		return b->nrune;	for(nr=0,p=b->ptr; *p; p+=w,nr++){		r = *p;		if(r < Runeself)			w = 1;		else			w = chartorune(&r, (char*)p);		left -= charwidth(f->font, r);		if(left < 0)			return nr;	}	berror("_frcanfit can't");	return 0;} void_frcklinewrap(Frame *f, Point *p, Frbox *b){	if((b->nrune<0? b->minwid : b->wid) > f->r.max.x-p->x){		p->x = f->left;		p->y += f->font->height;	}} void_frcklinewrap0(Frame *f, Point *p, Frbox *b){	if(_frcanfit(f, *p, b) == 0){		p->x = f->left;		p->y += f->font->height;	}} void_fradvance(Frame *f, Point *p, Frbox *b){	if(b->nrune<0 && b->bc=='\n'){		p->x = f->left;		p->y += f->font->height;	}else		p->x += b->wid;} int_frnewwid(Frame *f, Point pt, Frbox *b){	int c, x; 	c = f->r.max.x;	x = pt.x;	if(b->nrune >= 0)		return b->wid;	if(b->bc == '\t'){		if(x+b->minwid > c)			x = pt.x = f->left;		x += f->maxtab;		x -= (x-f->left)%f->maxtab;		if(x-pt.x<b->minwid || x>c)			x = pt.x+b->minwid;		b->wid = x-pt.x;	}	return b->wid;} void_frclean(Frame *f, Point pt, int n0, int n1)	/* look for mergeable boxes */{	Frbox *b;	int nb, c; 	c = f->r.max.x;	for(nb=n0; nb<n1-1; nb++){		b = &f->box[nb];		_frcklinewrap(f, &pt, b);		while(b[0].nrune>=0 && nb<n1-1 && b[1].nrune>=0 && pt.x+b[0].wid+b[1].wid<c){			_frmergebox(f, nb);			n1--;			b = &f->box[nb];		}		_fradvance(f, &pt, &f->box[nb]);	}	for(; nb<f->nbox; nb++){		b = &f->box[nb];		_frcklinewrap(f, &pt, b);		_fradvance(f, &pt, &f->box[nb]);	}	f->lastlinefull = 0;	if(pt.y >= f->r.max.y)		f->lastlinefull = 1;}