#include <u.h>#include <libc.h>#include <draw.h>#include <thread.h>#include <mouse.h>#include <frame.h> #define	CHUNK	16#define	ROUNDUP(n)	((n+CHUNK)&~(CHUNK-1)) uchar *_frallocstr(Frame *f, unsigned n){	uchar *p; 	p = malloc(ROUNDUP(n));	if(p == 0)		drawerror(f->display, "out of memory");	return p;} void_frinsure(Frame *f, int bn, unsigned n){	Frbox *b;	uchar *p; 	b = &f->box[bn];	if(b->nrune < 0)		drawerror(f->display, "_frinsure");	if(ROUNDUP(b->nrune) > n)	/* > guarantees room for terminal NUL */		return;	p = _frallocstr(f, n);	b = &f->box[bn];	memmove(p, b->ptr, NBYTE(b)+1);	free(b->ptr);	b->ptr = p;}