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/* Copyright (c) 1992 AT&T - All rights reserved. */
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <frame.h>
/*
* The code here and elsewhere requires that strings not be gcalloc()ed
*/
#define CHUNK 16
#define ROUNDUP(n) ((n+CHUNK)&~(CHUNK-1))
uchar *
_frallocstr(unsigned n)
{
uchar *p;
p = malloc(ROUNDUP(n));
if(p == 0)
berror("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)
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;
}
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