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