static
void
dupbox(Frame *f, int bn)
{
uchar *p;
if(f->box[bn].nrune < 0)
berror("dupbox");
_fraddbox(f, bn, 1);
if(f->box[bn].nrune >= 0){
p = _frallocstr(NBYTE(&f->box[bn])+1);
strcpy((char*)p, (char*)f->box[bn].a.ptr);
f->box[bn+1].a.ptr = p;
}
}
void
_frinsure(Frame *f, int bn, unsigned n)
{
Frbox *b;
uchar *p;
b = &f->box[bn];
if(b->nrune < 0)
berror("_frinsure");
if(ROUNDUP(b->nrune) > n) /* > guarantees room for terminal NUL */
return;
p = _frallocstr(n);
b = &f->box[bn];
memmove(p, b->a.ptr, NBYTE(b)+1);
free(b->a.ptr);
b->a.ptr = p;
}
